Method of producing wood-based product

FIELD: chemistry.

SUBSTANCE: method involves applying a water-based adhesive composition which contains non-gelled starch and additionally 0.1-50 wt % of one or more polymers (P) having an amine group or an amide group onto one or more parts of wood-based material and joining the one or more parts with one or more additional parts of wood-based material.

EFFECT: high quality of gluing.

13 cl, 2 tbl, 5 ex

 

The present invention relates to a method of obtaining product on the wood base.

Introduction

Resin on formaldehyde-based, such as phenol-formaldehyde resin, melamine-formaldehyde resin and urea resin, are widely used as binders in obtaining product on wood basis. Examples of such product in the wood-based are composite products, including layers, glued to each other, such as plywood, laminated products for flooring and veneered products are used, for example, in furniture. Additional examples are Subplate products such as wood sawdust, chipboard and fibreboard, where for molding slabs of wood chips and/or fibers pressed together with a binder.

During curing formaldehyde resin on the basis of formaldehyde may be released during the production of a product based on wood base, and later during use of the product. The release of formaldehyde in the air for many years is a significant problem from the point of view of health.

Increasingly urgent need for not containing formaldehyde wood adhesives that provide sufficient strength is kleivane and the overall quality of the final product, which makes them suitable for use as alternatives to adhesives of the prior art containing formaldehyde resin on the base.

In General, the most important properties that reflect the quality of the product is wood-based, are the resistance and bond strength. In the General case, there are specific quality parameters required to meet the standard for a specific end product. For example, wood-sawdust stove must meet certain standards in relation to, for example, the internal clutch, thickness swelling and water absorption, while laminate products for flooring must meet certain standards in relation to, for example, delamination and rupture of the fibers.

Alternatively, the adhesive compositions containing formaldehyde resin on the basis of available adhesives are based on polymer dispersions, such as polyvinyl acetate. However, upon receipt of the product obtained according to the method of direct compression as the result of gluing together layers of veneer and pressing the design into a specific form, it is important to minimize the so-called "springing" glued structure when retrieving it from the form. In General, the adhesives on the basis of polyvinyl acetate lead to newdale writelines results in as for springing.

It is also important that the product obtained by the method of direct pressing, during use, that is, during the impact load was essentially retain its shape. This property can be measured using the so-called "test fatigue"as used, for example, for furniture products, where the product obtained by the method of direct pressing, is exposed to a large number of cycles of load application.

Alternatively, the formaldehyde resins on the basis of the compositions of wood adhesives adhesives have been proposed by a starch-based. In the work of the Imam, et al., "Wood Adhesive from Crosslinked Poly(vinyl alcohol) and Partially Gelatinized Starch: Preparation and Properties", Starch/blitz chess 51 (1999) Nr. 6, S. 225-229 described adhesive composition comprising starch and polyvinyl alcohol, and the composition further comprises a melamine resin. In documents US 2051025, US 2102937, US 3487033, US 3355307 describes adhesives on a starch-based, used for the manufacture of corrugated cardboard. In document WO 03/069061 A1 describes an adhesive on a starch-based, used in the manufacture of cardboard products.

But there is still a need for alternative methods of bonding materials wood-based, when using the adhesive compositions on a starch-based.

In accordance with this the m the present invention provides a method of bonding materials wood-based result from the use of the adhesive composition, which has a starch basis, providing excellent bonding quality.

Invention

The present invention relates to a method of obtaining product on wood basis, including the application of the adhesive composition is water-based, containing regulationsgoverning starch, where the composition further comprises from about 0.1 to about 50% (wt.) one or more polymers (P), having an amine group or an amide group, one or more pieces of material for wood-based and connection of one or more parts of one or more pieces of material, preferably the material is wood-based.

Under regulationsgoverning starch herein is a starch which in the aqueous phase was subjected to only temperatures that are lower than 50°C., in a suitable case, smaller than about 45°, preferably smaller than 40°C, and therefore did not undergo gelatinization.

The mass ratio between starch and polymers (P) in the adhesive composition used in this way, in an appropriate case, is in the range from about 1:2 to about 25:1, FAV is preferably from about 1:1 to about 15:1, most preferably from about 3:1 to about 8:1.

The adhesive composition used in this way, in an appropriate case contains from about 10 to about 50% (wt.) starch, preferably from about 15 to about 45% (mass.), more preferably from about 20 to about 40% (mass.), most preferably from about 25 to about 35% (wt.).

The adhesive composition used in this way, in an appropriate case contains from about 1 to about 40% (wt.) one or more polymers (P), preferably from about 1.5 to about 25% (mass.), most preferably from about 2 to about 15% (wt.).

The levels of solids in the adhesive composition used in this way, in an appropriate case, is in the range from approximately 20 to approximately 70% (mass.), preferably from about 35 to about 60% (mass.), most preferably from about 40 to about 50% (wt.).

Under "levels of solids in the adhesive composition used in this way, in this document refers to non-aqueous portion of the adhesive composition.

Examples of starches suitable for use in adhesive compositions, and the use in this way are native starches and modified starches obtained, for example, potatoes, corn, wheat, rice, peas and the like, such as acetylated split starch, starch, modified ultilateral acid, oxidized starch, hydroxypropyltrimonium starch, cationic starch, amylopectin starch, vysokopilsky acetylated starch, tapioca starch, native potato starch, native corn starch, native corn starch, native rice starch and native pea starch.

One or more polymers (P) in the adhesive composition used in this way, in an appropriate case contain monomer units having amine or amide group. In an appropriate case, amine or amide group have from about 5 to about 100% of monomer units in one or more polymers (P), preferably from about 25 to about 100%, more preferably from about 50 to about 100%, even more preferably from about 90 to about 100%. The most preferred amine or amide group have all monomer units in one or more polymers (P).

One or more polymers (P) in an appropriate case, have a primary amine group or an amide group. Odie is or more polymers (P) preferably includes one or more polymers, choose from polyvinylene, copoly(vinyl alcohol-vinyl acetate), copoly vinyl alcohol-vinylformamide), allylamine, polyethylenimine, polyamidoamine and polyvinylformamide. More preferably one or more polymers (P) include one or more polymers selected from polyvinylidene and copoly (vinyl alcohol-vinylamine). Most preferably the polymer (P) is polyvinyliden.

In one embodiment, the implementation of one or more polymers (P) in a suitable case, belong to the group of the vinyl polymer. In this case, one or more polymers (P) preferably include one or more polymers selected from polyvinylidene, copoly (vinyl alcohol-vinylamine), copoly (vinyl alcohol-vinylformamide), allylamine and polyvinylformamide. More preferably one or more of the vinyl polymer (P) have a primary amine group. Most preferably the vinyl polymer (P) is polyvinyliden.

In one embodiment, the implementation of one or more polymers (P) in an appropriate case, have a primary amine group or an amide side groups. One or more polymers (P) preferably include one or more polymers selected from polyvinylidene, copoly (vinyl alcohol-vinylamine), copoly (vinyl CertainTeed), of allylamine, polyethylenimine and polyvinylformamide. Most preferably the polymer (P) is polyvinyliden or polyethylenimine.

Polyvinyliden usually get as a result of hydrolysis polyvinylformamide to a certain extent. Under the "polyvinylene" in this document to understand polyvinyliden, where the molar ratio between the amine groups and formamidine groups is in the range from 5:95 to 100:0. If the molar ratio between the amine groups and formamidine groups, less than 5:95, the polymer is defined as polyvinylformamide. The molar ratio between the amine groups and formamidine groups polyvinylene preferably is in the range from about 10:90 to about 100:0, more preferably from about 50:50 to about 100:0, most preferably from about 80:20 to about 100:0.

Copoly (vinyl alcohol-vinylamine) are usually obtained in the copolymerization of vinyl acetate and vinylformamide with subsequent hydrolysis, which results in obtaining a copolymer containing units of vinyl alcohol and vinylamine. The copolymer can also be present residual formamide group, as well as residual acetate groups. The molar ratio between the amine groups and formamidine groups in the SOP is whether (vinyl alcohol-vinylamine) is in the range from 5:95 to 100:0. In the case of the numerical ratio between the amine groups and formamidine groups, less than 5:95, the polymer is defined as copoly (vinyl alcohol-vinylformamide). The molar ratio of hydroxyl groups and acetate groups in copoly (vinyl alcohol-vinylamine) or copoly (vinyl alcohol-vinylamine) in a suitable case is in the range from about 25:75 to 100:0, preferably from about 75:25 to 100:0. The molar ratio between the amine and formamidine groups and hydroxyl and acetate groups in copoly (vinyl alcohol-vinylformamide) or copoly (vinyl alcohol-vinylformamide) in a suitable case is in the range from about 3:97 to about 100:0, preferably from about 10:90 to about 100:0, most preferably from about 25:75 to about 100:0.

One or more polymers (P) in an appropriate case, have a mass-average molecular weight in the range from about 1000 to about 1000000 g/mol, preferably from approximately 10,000 to approximately 800,000 g/mol, more preferably from approximately 20,000 to approximately 600,000 g/mol, most preferably from about 50,000 to about 500000 g/mol.

Viscosity (Brookfield, 12 rpm, spindle 4, at 20°C) the adhesive composition suitably is m is less than 100,000 MPa*s, preferably in the range from about 1000 to about 50000 MPa*s, most preferably from about 5000 to about 20000 MPa*s.

The adhesive composition used in this way, shortly before use can also be combined with the stapler. Suitable for use with the suturing are those that react with amine and/or hydroxyl groups. Examples of staplers are: isocyanates, monomers or polymers containing adipic acid, melamine-formaldehyde resin, urea resin, melamine salts, aldehydes, such as glutaric aldehyde, glyoxal and polymer aldehydes, such as dialtelecom, and complexing agents, such as zirconium salt. The addition can be performed to either of the two components of the adhesive composition. In the case of staple quantity component of the adhesive composition in an appropriate case comes up to approximately 30% (mass.) or is in the range from approximately 0.1 to approximately 30% (mass.).

The adhesive composition used in this way, in an appropriate case further comprises one or more polymers (P1)having acetoacetate. The levels acetoacetate in one or not is how many of the polymers (P) in a suitable case is in the range from about 0.05 to about 15% (mol.), preferably from about 1 to about 10% (mol.). One or more polymers (P1) preferably include acetoacetotoluidide polyvinyl alcohol (AAPS).

One or more polymers (P1) in an appropriate case, have a mass-average molecular weight in the range from about 1000 to about 5000000 g/mol, preferably from about 10,000 to about 2000000 g/mol.

One or more components of the adhesive composition used in this way and starch-containing polymer (P) and the polymer (P1), respectively, can optionally contain additives, such as viscosity regulators and fillers such as kaolin, flour from whole grain wheat flour, soya flour, flour from the shell of a walnut or more that is known for its suitability for use in the formulations of wood adhesives.

The adhesive composition used in this way may also contain inorganic or organic salts, which can occur from a solution of one or more polymers (P) or (P1)used when receiving the adhesive composition on a starch basis. Part of one or more polymers (P) and/or (P1) may have an ionic charge, preferably a cationic charge. The number of negatively charged counterions of the salts in the adhesive compositions can be in d is apatone from 0 to about 10% (mass.) or from about 0.1 to about 5% (mass.) or from about 0.2 to about 1% (mass.).

The adhesive composition used in this way, can also contain a polymer or a copolymer (A2) one or more monomers with the unsaturation of ethylene type, different from the one or more polymers (P). The polymer or copolymer (A2) in a suitable case does not have any acetoacetate. The amount of polymer or copolymer (A2) in the adhesive composition in a suitable case is in the range from approximately 1 to approximately 50% (mass.), preferably from approximately 3 to approximately 40% (mass.), most preferably from about 5 to about 30% (mass.).

The dispersion of the polymer or copolymer (A2) in addition to its contact to the starch and one or more polymers (P) to obtain adhesive compositions can also be used as a separate component in combination with an adhesive composition to obtain a combination of adhesive compositions corresponding to the invention, and dispersion of the polymer or copolymer (A2) one or more unsaturated monomers. Then this combination can be used in the method of the invention. In this combination, the number of adhesive compositions in a suitable case is in the range of from about 25 to about 99% (mass.), preferably from approximately 40 to approximately 90% (mass.), the most the e preferably from about 50 to about 85% (wt.), when calculating the gross weight of combination. The amount of dispersion of the polymer or copolymer (A2) in a suitable case is in the range from approximately 1 to approximately 75% (mass.), preferably from about 10 to about 60% (mass.), most preferably from about 20 to about 50% (mass.), when calculating the gross weight of combination. The amount of polymer or copolymer (A2) in their dispersion in a suitable case is in the range from approximately 10 to approximately 90% (mass.), preferably from about 25 to about 75% (wt.).

Examples suitable for use polymers or copolymers of one or more monomers with the unsaturation of ethylene type are homopolymers of vinyl esters such as polyvinyl acetate, copolymers of vinyl esters, such as the copolymer of ethylene-vinyl acetate (EVA) or copolymers of vinyl acetate with one or more acrylic monomers such as methyl methacrylate or butyl acrylate, styrene-butadiene rubber (SBC) and polyacrylates.

In General, the inclusion of polymers or copolymers of one or more monomers with the unsaturation of ethylene type, related to the types listed previously, in the adhesive composition on a starch-based, used in this way,or in combination with an adhesive composition on a starch-based can improve the bonding characteristics, such as the gap fiber veneered or laminate products.

In one embodiment, the implementation of the method in a suitable case includes applying the adhesive composition on a piece of wood-based, the introduction of a surface coated with an adhesive composition in contact with the surface of another piece of wood-based and, thus, the connection parts as a result of receiving the adhesive connection between the parts.

In one implementation of this method, the adhesive composition is dried after application, and subsequently activated by adding water to the composition.

In one embodiment, the implementation in the manufacture of laminated products of the present method in a suitable case includes applying the adhesive composition to the surface so that the glue joint would initially applied amount in the range of from about 0.1 to about 500 g/m2. Incurred depends on the product: for plywood, obtained by direct pressing method, it is preferably in the range from approximately 50 to approximately 200 g/m2for material laminate flooring it is preferably in the range from about 100 to about 160 g/m2and for laminated beams, it is preferable nah which is in the range of from about 180 to about 500 g/m 2. Suitable for use with the upper limit also depends on the type of material wood-based, which is applied to the solution. The adhesive composition may be applied to one or both of the joined surface. In the case of deposition on both surfaces of the sum of the quantities printed on each surface will correspond to the preferred quantities for all of the specified adhesive connection.

In the manufacture of plywood, obtained by direct pressing method, this method in an appropriate case involves a join of more than two parts materials wood-based, preferably from 2 to 15.

Materials wood-based in addition to solid wood in this document are also included and wood materials, such as materials fibreboard, chipboard and wood-sawdust stoves. Joint surfaces may be identical to or different types of material is wood-based.

Material wood-based can refer to any type and form of material to wood-based, such as shavings, fibers, sheets, plates, veneer, parts and the like.

In one embodiment, the implementation of this method involves gluing parts materials wood-based, where part of the material for wood-based are wood chips, where the term "others who Vesna chips" in this document includes chips, chips, flakes, particles, sawdust or any other finely ground material is wood-based. In this case, the product on the wood base is a composite products such as chipboard, wood sawdust or wood-fiber Board or oriented strand Board.

The moisture content used wood chips in a suitable case is in the range from approximately 0 to approximately 20% (mass.), preferably from about 1 to about 10% (mass.), more preferably from about 1.5 to about 5% (wt.).

The mass ratio of wood chips and adhesive composition used in this method, the calculation of dry weight in an appropriate case, is in the range from about 100:1 to about 1:1, preferably from about 50:1 to about 2:1, more preferably from about 30:1 to about 2.5:1, most preferably from about 15:1 to about 3:1.

The moisture content of the mixture of wood chips and adhesive compositions used in this way, at the beginning of pressing in a suitable case is in the range from about 3 to about 25% (mass.), preferably from about 5 to about 20% (mass.), more preferably from approximately the part 6 to about 18% (mass.), most preferably from about 7 to about 15% (wt.).

For applying the adhesive composition preferably should be pressing. Pressing in a suitable case is carried out at elevated temperature. The temperature of pressing depends on what product wood-based is supposed to produce, but in an appropriate case, it may be in the range of from about 0 to about 250°C., and preferably from about 70 to about 200°C.

For laminate or veneered products temperature pressing while nedobavlennyh in the adhesive composition a binder in a suitable case is in the range from approximately 0°to approximately 200°C, preferably from approximately 20 to approximately 150°C., even more preferably from about 50 to about 130°C., most preferably from about 70 to about 130°C. In the case of adding adhesive composition staple temperature extrusion can sometimes be reduced depending on the efficiency of the stapler.

For products in the form of wood-sawdust, wood particle Board and fiberboard temperature of pressing is preferably in the range from about 100 to about 225°C., most preferably from about 150 to about 20°C. For laminate products such as plywood products, laminated products for flooring or veneered products for flooring, the temperature of pressing is preferably in the range from about 70 to about 175°C., most preferably from about 90 to about 160°C.

The pressing time and temperature of the pressing linked in such a way that a lower temperature extrusion in General require longer times pressing. Manufactured product wood-based is in fact also determines and suitable for use temperature pressing, pressing. While pressing in a suitable case is at least about 10 seconds, in an appropriate case, is also in the range from about 10 seconds to about 60 minutes, preferably is at least about 30 seconds, preferably also is in the range from about 30 seconds to about 30 minutes, most preferably is at least about 1 minute, preferably also in the range of from about 1 to about 15 minutes.

In one embodiment, the implementation part of the material for wood-based are sheets or VL is tiny. In this embodiment the product on wood base in a suitable case is a material laminate flooring, veneered flooring, material Spandau furniture, wall panel, roof panel, plywood or laminated beam.

Product wood-based invention in a suitable case is a laminate or veneered material, such as laminate flooring, veneered flooring, material Spandau furniture, plywood, wall panel, roof panel, laminated beam, or composite products, such as wood sawdust stove, wood-fiber Board, wood particle Board or oriented strand Board. Preferably it is a plywood material Spandau furniture, veneered flooring, laminate flooring or wood-sawdust stove.

The invention is additionally illustrated using the following non-limiting examples. Parts and percentages relate to mass parts, respectively, the mass percentage unless other specified.

Examples

Example 1

Glue on a starch-based was obtained by mixing at room temperature (25°C) 65,5 g of an aqueous solution of about 7.5% (mass.) polyvinyl is on (Lupamin® 9095 from BASF), 5.7 g of water and 32.4 g of corn starch (C*Gum NC 03432 from Cerestar, moisture content 10%). The numerical ratio between amine groups and formamidine groups polyvinylene accounted for more than 90:10. The mass-average molecular weight of polyvinylidene was 340000 g/mol. The viscosity of the composition at 20 ° C measured is equal to 12000 MPa*s (Brookfield, 12 rpm, spindle 4).

Example 2

Glue on a starch-based was obtained by mixing 75 mass parts of the adhesive composition corresponding to example 1, and 25 mass parts of a dispersion of acrylate/PVA, characterized by a content of the polymer is 50% (mass.).

Example 3

Veneered products produced as the result of gluing the top beech veneer with a thickness of 0.6 mm on one side of the wood-sawdust slabs with dimensions of 15×15 cm On plate inflicted 3.7 g of adhesive compositions corresponding to examples 1 and 2, and veneer for 1 minute directly repressively on the plate at 90 and 130°C, respectively. Were tested on the gap fiber (chisel).

Table 1
The pressing time of 1 minute
The temperature of extrusionGap fiber (%)
Example 1Example 2
HeatColdHeatCold
90°C000-510
130°C90-10010090100

The tests were repeated, but using instead of what it was before, time is pressing for 10 minutes at 90°C and 5 minutes at 130°C, respectively. The results shown in table 2.

Table 2
The pressing time of 10 minutes
The temperature of extrusionThe pressing timeGap fiber (%)
Example 1Example 2
HeatColdHeatCold
90ºC 10 minutes101080-90100
130 º C5 minutes90-10010090-100100

Example 4

Each of the two types of product were made from 13 veneers of beech wood, glued to each other using adhesive compositions corresponding to examples 1 and 2, respectively, in combination with direct pressed for 8 minutes at 120°C. For both types of product were determined springing. For both types of product springing was very low.

Example 5

Wood sawdust stove produced in the mixing 864 g of wood chips, characterized by a moisture content of 1.7% (mass.), with 216 g of the adhesive composition obtained by mixing at room temperature 131 g of an aqueous solution of about 7.5% (mass.) polyvinylene (Lupamin® 9095 from BASF), 75 g of corn starch (C*Gum NC 03432 from Cerestar, moisture content 10%) and 10 g of water. Stirring was carried out for 5 minutes at room temperature (22°C). Shaving the mixture was molded in the form of a sheet with dimensions of 30×30 cm and within three minutes extruded at 189°C to obtain p is the ITA with a thickness of 16 mm The sequence of pressure application consisted of 150 kg/cm2within 30 seconds, 40 kg/cm2within 2 min and 2 kg/cm2in the last 30 seconds. Ultimate tensile strength (inner grip, SC) was measured in the bonding of parts with dimensions of 5×5 cm to the two metal blocks and tearing them apart. Also measured the swelling thickness (NT) and water absorption (EAP). The thickness swelling was measured by determining the degree of swelling after immersion of a piece with dimensions of 5×5 cm in water (20°C, 24 hours). Water absorption was measured by determining the increase in weight after immersion of a piece with dimensions of 5×5 cm in water (20°C, 24 hours).

The value of the aircraft was 690 kPa, HT was equal to 53%, and EAP (24 h) was 121%.

1. The method of obtaining product on wood basis, including the application of adhesive compositions containing regulationsgoverning starch in the aqueous phase, where the composition further comprises from about 0.1 to about 50% (wt.) one or more polymers (P), having an amine group or an amide group, one or more pieces of material for wood-based and connection of one or more parts of one or more pieces of material.

2. The method according to claim 1, where the amount of starch in the adhesive composition is in the range from approx the tion 15 to about 40% (wt.).

3. The method according to any one of claims 1 and 2, where the number of one or more polymers (P) in the adhesive composition is in the range from about 2 to about 25% (wt.).

4. The method according to any one of claims 1 and 2, where one or more polymers (P) belong to the group of polyvinylene, copoly(vinyl alcohol-vinylamine), allylamine, polyethylenimine and polyvinylformamide.

5. The method according to any one of claims 1 and 2, where the polymer (P) is polyvinyliden.

6. The method according to any one of claims 1 and 2 where the adhesive composition further comprises one or more polymers (P1)having acetoacetate.

7. The method according to any one of claims 1 and 2 where the adhesive composition further comprises a polymer or a copolymer (A2) one or more monomers with ethylene unsaturation other than one or more polymers (P).

8. The method according to claim 7, where the polymer (P2) is a homopolymer of vinyl ether complex or the copolymer of vinyl ether complex.

9. The method of claim 8, where the polymer (A2) is a copolymer of vinyl acetate and one or more acrylic monomers.

10. The method according to any one of claims 1 and 2, including gluing parts materials wood-based, where part of the material for wood-based are sheets or plates.

11. The method according to l is the Boma one of claims 1 and 2, including gluing parts materials wood-based, where part of the material for wood-based are wood chips.

12. The method according to any one of claims 1 and 2, where the product on the wood base is a material laminate flooring, material veneered flooring, material Spandau furniture, wall panel, roof panel, plywood or laminated beam.

13. The method according to any one of claims 1 and 2, where the product on the wood base is a wood shaving, wood sawdust or wood-fiber plate or oriented strand slab.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: method involves depositing an adhesive system onto one or more pieces of wood-based material and joining one or more pieces with one or more additional pieces of the material. The adhesive system contains one component which contains starch, and another component which contains one or more polymers belonging to a group comprising polyvinyl amine, copolymers poly(vinyl alcohol-co-vinyl amine), poly(vinyl alcohol-co-vinyl formamide), polyallyl amine, polyethylene imine, polyamido amine and polyvinyl formamide. The two components are deposited on the wood-based material as unmixed separate components. The adhesive system further contains one or more polymers containing acetoacetylated polyvinyl alcohol.

EFFECT: use of the adhesive system enables to produce such wood-based products as boards based on chips, particles or fibres or boards based on aligned long chips.

19 cl, 1 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: composition contains carrier starch and secondary starch. The carrier starch contains (in terms of dry mass), less than 50% pre- gelatinised starch and has higher sensitivity to alkali than the secondary starch. The secondary starch is selected from a group comprising maize starch, potato starch, wheat starch and a mixture of two or more of the said types of starch. The carrier starch is selected from a group comprising wheat starch, potato starch, cassava starch, barley starch and a mixture of two or more of the said types of starch. The composition contains (in terms of dry mass) 0.5-60% carrier starch, 40-99.5% secondary starch and 1-8% alkali. The composition also contains (in terms of dry mass) 0.1-3.5% boron compound. An adhesive is obtained by adding the composition to water and stirring while adding a sufficient amount of alkali. The adhesive is used to make corrugated cardboard and multilayer materials. The advantage of the adhesive composition lies in that it can be easily prepared with low expenses on time and equipment.

EFFECT: use of the adhesive improves quality of cardboard, reduces adhesive consumption and increases rate of production.

25 cl, 6 tbl, 1 ex

FIELD: glue materials.

SUBSTANCE: invention relates to a method for preparing glue Stein hall with the high content of dry matter by using a single mixing capacity and comprising the following steps: 1) preparing a carrier by gluing the first part of starch in medium containing part of alkali necessary for preparing the glue; 2) diluting a carrier with water followed by addition of at least lesser part of the second part of starch; 3) addition of remaining part of the second part of starch and remaining part of alkali in diluted form that is necessary for preparing the glue. Addition of remaining the second part of starch and alkali is carried out in stages. Invention provides preparing the glue with the high content of dry and simplifying technology for its preparing.

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10 cl, 2 ex

FIELD: production of the glue composition of labeling assignment.

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1 tbl, 8 ex

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7 cl, 1 ex

The invention relates to the production of adhesive materials used in the printing industry for bookbinding works, in particular in the process of mechanized production of binding caps on high-speed equipment

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FIELD: chemistry.

SUBSTANCE: method involves depositing an adhesive system onto one or more pieces of wood-based material and joining one or more pieces with one or more additional pieces of the material. The adhesive system contains one component which contains starch, and another component which contains one or more polymers belonging to a group comprising polyvinyl amine, copolymers poly(vinyl alcohol-co-vinyl amine), poly(vinyl alcohol-co-vinyl formamide), polyallyl amine, polyethylene imine, polyamido amine and polyvinyl formamide. The two components are deposited on the wood-based material as unmixed separate components. The adhesive system further contains one or more polymers containing acetoacetylated polyvinyl alcohol.

EFFECT: use of the adhesive system enables to produce such wood-based products as boards based on chips, particles or fibres or boards based on aligned long chips.

19 cl, 1 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: composition is an adhesive composition based on starch or polyvinyl acetate. The adhesive composition contains glue and an additive. The additive is a homopolymer of α,β-unsaturated acrylic acid or a copolymer of α,β-unsaturated acrylic acid with at least one alkylacrylate. The homopolymer or copolymer is cross-linked by a cross-linking agent which is a multifunctional vinylidene monomer. The vinylidene monomer is, for example, butadiene, isoprene, divinyl benzene or divinyl naphthalene. The cross-linking agent is polyalkenyl ether with several ether groups, particularly allyl pentaerythritol. The additive is a pseudoplastic material. The adhesive composition contains at least 0.001 wt % additive. The method of preparing the adhesive composition involves diluting the additive with starch and an optical brightening agent and then adding to the adhesive composition. The additive is mixed in form of a solid composition with a solid starch composition in form of a solid mixture prepared beforehand. The solid mixture contains thickened starch, alkali, powdered starch, borax and 0.001-5 parts additive. Alternatively, the additive is added to a liquid starch composition in form of a liquid composition. The adhesive composition is used particularly to make packed cardboard with several stacked layers of paper or cardboard.

EFFECT: adhesive composition has low viscosity when applied on corrugated cardboard, after which viscosity instantly increases, which prevents the glue from flowing off and ensures good adhesion.

16 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: composition contains carrier starch and secondary starch. The carrier starch contains (in terms of dry mass), less than 50% pre- gelatinised starch and has higher sensitivity to alkali than the secondary starch. The secondary starch is selected from a group comprising maize starch, potato starch, wheat starch and a mixture of two or more of the said types of starch. The carrier starch is selected from a group comprising wheat starch, potato starch, cassava starch, barley starch and a mixture of two or more of the said types of starch. The composition contains (in terms of dry mass) 0.5-60% carrier starch, 40-99.5% secondary starch and 1-8% alkali. The composition also contains (in terms of dry mass) 0.1-3.5% boron compound. An adhesive is obtained by adding the composition to water and stirring while adding a sufficient amount of alkali. The adhesive is used to make corrugated cardboard and multilayer materials. The advantage of the adhesive composition lies in that it can be easily prepared with low expenses on time and equipment.

EFFECT: use of the adhesive improves quality of cardboard, reduces adhesive consumption and increases rate of production.

25 cl, 6 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: composition contains carrier starch and secondary starch. The carrier starch contains (in terms of dry mass), less than 50% pre- gelatinised starch and has higher sensitivity to alkali than the secondary starch. The secondary starch is selected from a group comprising maize starch, potato starch, wheat starch and a mixture of two or more of the said types of starch. The carrier starch is selected from a group comprising wheat starch, potato starch, cassava starch, barley starch and a mixture of two or more of the said types of starch. The composition contains (in terms of dry mass) 0.5-60% carrier starch, 40-99.5% secondary starch and 1-8% alkali. The composition also contains (in terms of dry mass) 0.1-3.5% boron compound. An adhesive is obtained by adding the composition to water and stirring while adding a sufficient amount of alkali. The adhesive is used to make corrugated cardboard and multilayer materials. The advantage of the adhesive composition lies in that it can be easily prepared with low expenses on time and equipment.

EFFECT: use of the adhesive improves quality of cardboard, reduces adhesive consumption and increases rate of production.

25 cl, 6 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: composition contains carrier starch and secondary starch. The carrier starch contains (in terms of dry mass), less than 50% pre- gelatinised starch and has higher sensitivity to alkali than the secondary starch. The secondary starch is selected from a group comprising maize starch, potato starch, wheat starch and a mixture of two or more of the said types of starch. The carrier starch is selected from a group comprising wheat starch, potato starch, cassava starch, barley starch and a mixture of two or more of the said types of starch. The composition contains (in terms of dry mass) 0.5-60% carrier starch, 40-99.5% secondary starch and 1-8% alkali. The composition also contains (in terms of dry mass) 0.1-3.5% boron compound. An adhesive is obtained by adding the composition to water and stirring while adding a sufficient amount of alkali. The adhesive is used to make corrugated cardboard and multilayer materials. The advantage of the adhesive composition lies in that it can be easily prepared with low expenses on time and equipment.

EFFECT: use of the adhesive improves quality of cardboard, reduces adhesive consumption and increases rate of production.

25 cl, 6 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: composition contains at least partially gelatinised starch and one or more polymers (P) containing an amine group. Polymers (P) are selected from a group consisting of polyvinyl amine, poly(vinyl alcohol-co-vinyl amine) and polyethyleneimine. Amount of starch in the adhesive composition is approximately between 15 and 40 wt %. Amount of one or more polymers (P) in the adhesive composition is approximately between 2 and 25 wt %. Total amount starch and one or more polymers (P) in the adhesive composition is approximately between 35 and 55 wt %. The composition also contains a polymer or copolymer of one or more ethylene-unsaturated monomers, as well as a polymer which contains an acetoacetoxy group. The polymer or copolymer of one or more ethylene-unsaturated monomers is a vinyl ester homopolymer or a vinyl ester copolymer. The adhesive composition can be a combined composition and can additionally contain an adhesive composition based on a dispersion of a polymer of one or more ethylene-unsaturated monomers. The polymer is a vinyl ester homopolymer or a vinyl ester copolymer. The method of preparing the adhesive composition involves mixing starch and one or more polymers (P) in an aqueous phase at high temperature approximately between 50 and 99°C. The high temperature is maintained for at least one minute. The method of gluing components from wood-based materials involves application of the adhesive composition onto one or more wood-based components and joining one or more component with one or more other components. The components made from wood-based material can be wood chips. A wood-based article comprising components made from wood-based material is obtained using the adhesive composition. The wood-based article can include one or more layers joined by the adhesive composition. The invention enables to obtain an adhesive composition with low viscosity and excellent gluing quality.

EFFECT: high bonding strength, water resistance, reduced bouncing, retention of shape during loading.

34 cl, 11 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to an adhesive system which is an adhesive composition and which can be used for gluing wood-based elements, and to a method of obtaining the said adhesive system. The adhesive system contains at least partially helium-saturated starch and a polymer (P) which is an acetoacetylated polyvinyl alcohol. The adhesive system also contains a polymer or copolymer which contains primary amino- or amido groups. The adhesive composition is obtained by mixing starch and polymer (P), which is an acetoacetylated polyvinyl alcohol. The adhesive composition can be used as an adhesive system for gluing wood-based material elements. The wood-based material elements can be sheet materials or wood chips.

EFFECT: invention enables use of the adhesive system to obtain wood-based products through application of the adhesive system and gluing, such as laminated or facing materials or moulded slabs.

8 cl, 3 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to paper industry, particularly to wallpaper with layer of adhesive substance on opposite side. Described is wallpaper with layer of adhesive substance, which contains: A) cellulose ether, converted in form of slow action (retard-form); B) pH-regulator for alkaline area over 8; C) capable for swelling, water-insoluble in polymer with milting degree from 5 to 2. Also described is method of wallpaper manufacturing.

EFFECT: obtaining wallpaper, ensuring good ability for movement during smoothing.

14 cl, 2 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to paper industry, particularly to wallpaper with layer of adhesive substance on opposite side. Described is wallpaper with layer of adhesive substance, which contains: A) cellulose ether, converted in form of slow action (retard-form); B) pH-regulator for alkaline area over 8; C) capable for swelling, water-insoluble in polymer with milting degree from 5 to 2. Also described is method of wallpaper manufacturing.

EFFECT: obtaining wallpaper, ensuring good ability for movement during smoothing.

14 cl, 2 dwg, 4 ex

FIELD: mixture for introducing in liquid aqueous system.

SUBSTANCE: claimed mixture contains at least one ultradispersed active component for followed dissolution and dispersion in liquid aqueous system. Additionally mixture contains cellulose-containing plant fibers in amount of 2-18 wt.%. Said fibers are preliminary physically or chemically treated with thermomechanical treatment method, chemothermomechanical treatment method, or cellulose extraction method under low pressure. Abovementioned fibers have average length of 20-350 mum, and mixture is in fine-grained form with size from 0.5 mm to several mm. Method for introducing of mixture, containing at least one ultradispersed active component in liquid aqueous system includes blending of active components with abovementioned cellulose-containing plant fibers and introducing thereof into liquid aqueous system.

EFFECT: improve method for manipulation, dosage and introducing of ultradispersed active components, prevention of material agglomeration or consolidation during continued storage.

11 cl, 1 ex, 1 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: in the present method, biopolymer starting material and a plasticiser are fed into the feeding zone of an extruder having an auger configuration such that the biopolymer starting material, particularly starch, in the extruder undergoes processing by shearing forces, and a cross-linking agent is fed into the extruder on the process scheme downstream the feeding zone. The method is characterised by output higher than or equal to 1.0 metric ton of the product per hour. The biopolymer starting material and plasticiser are preferably fed into the feeding zone separately. The extruder in the feeding zone can have single-turn elements. Temperature in the intermediate section of the extruder is not higher than 100°C. Configuration of the auger can include two or more sealing sections for water vapour. Shearing forces in the first section of the extruder can be greater than shearing forces in the neighbouring second section of the extruder lying on the process scheme downstream the first section. Water can be fed into the post-reaction section lying after the position in which the cross-linking reaction has finished in order to improve operational characteristics of the head.

EFFECT: method enables to obtain cross-linked nanoparticles of a uniform size, having high molecular weight and also enables to manipulate molecular weight of a protective colloid.

38 cl, 3 dwg, 2 tbl, 10 ex

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