Bagasse composite, method for preparation thereof and material for internal application using said composite
SUBSTANCE: composite contains 55-75 wt % bagasse fibre with particle size of 40-120 mesh and length to diameter ratio ranging from 3:1 to 5:1 and 25-45 wt % thermoplastic polymer. The bagasse is prepared from a by-product of sugarcane refining. The separated fibres are softened by adding water and grinding. The fibres are then mixed with a thermoplastic polymer and the fibre-polymer mixture is extruded to obtain a composite.
EFFECT: obtaining a high-strength ecologically clean composite which can be used for a long period of time without deformation and colour change.
12 cl, 1 dwg, 1 tbl, 7 ex
The technical field
The present invention relates to a composite material used to manufacture the product made use of instead of the material for internal use (such as flooring material, wall material, covering material, sound insulating wall and fittings) and treated wood. More specifically, the present invention relates to a composite comprising fibers obtained from bagasse, and a thermoplastic polymer, the preparation method of the composite material for internal use, use it.
The level of technology
The preference of consumers in natural wood greatly increased in recent years. Also, since the cutting natural wood has led to an increase in carbon dioxide, there was a danger to the environment. Thus, increased the need to develop a material made with the possibility of replacement of natural wood, especially in the case of building materials with significant demand for natural wood.
Given the above problem, the search of the composite having a structure and appearance similar to natural wood, were intensively in recent years.
Accordingly, there has been proposed a composite that includes a small amount of wood is s, or non-wood composite. For example, traditional composites are divided into plywood and MDF (wood-fiber Board medium density). Plywood a type of composite is made by sawing solid wood, color one side surface or both side surfaces of wood, wood drying, gluing film and so forth on the wood with adhesive, wood drying and cutting of timber on a given length. MDF is made by rubbing a solid wood or wood waste into powder, adding a large amount of resin powder and thermal compression of the mixture. MDF can be attached to natural Spano or synthetic Spano, and then processed for appropriate use.
However, such composite wood causes environmental pollution due to the fact that the composition of the adhesive included hazardous materials. Also, the problem of MDF that occurs the compression/expansion between the veneer and the wood plate, and attached veneer is separated, split or rot from the penetration of external moisture and so on.
Also, Publication of Japanese patent No. 1995-080809 (1995.03.28) discloses a waterproof cardboard, using bagasse instead of wood. Waterproof cardboard is prepared by mixing fibers (2-8 cm) and the powder obtained by grinding bagasse, IU the amine resin and/or phenolic resins. However, in the preparation of waterproof cardboard, melamine resin and/or phenolic resin as the adhesive bonds the fibers and the powder with each other, and does not impregnate large fibers, since the resin is not able to penetrate into the fibers due to their large size. Accordingly, the waterproof cardboard shows a low resistance (e.g., strength) as compared with the case where the resin impregnated in the fiber. Also, waterproof cardboard has a problem in that the adhesion of a melamine resin and/or phenolic resin is reduced liquid and so on for a long time, and the cardboard is easily torn or partially separated. Also, waterproof cardboard molded into a slab termocompressive molding, and thus may not have many forms and types. Furthermore, the material comprising melamine resin and/or phenolic resin cannot be reused, and thus is not environmentally safe.
Accordingly, it is required to conduct a study of the composite, which does not use wood that has less distortion and high strength, and does not fade even when exposed to sunlight, and is environmentally safe.
The present invention is to provide the group of high-strength composite and method of its preparation in which the composite can be safely used for a long time without deformation (e.g., tearing, separation, warping and fading.
Also, another objective of this invention is the provision of material for internal use (such as flooring material, wall material, covering material, sound insulating wall and accessories)using the composite.
In accordance with an aspect of the present invention, is provided a composite comprising 55-75 wt.% fiber and 25-45 wt.% thermoplastic polymer, in which the fibers are derived from bagasse and have a particle size of 40-120 mesh, and the ratio of length to diameter of from 3:1 to 5:1.
In accordance with another aspect of the present invention, is provided a method of making a composite, comprising the steps: preparation of bagasse with less than 5 wt.% the moisture content of de-hydration bagasse, obtained as a by-product of the process of refining sugar from sugar cane; collecting fibers location prepared bagasse on a conveyor belt, having mounted on it a grid, and filtration bast; softening of the collected fibers are added to water and ramming fibers; grinding the softened fibers, using grain peeling machine; mixing in the melt 55-75 wt.% PR is made of fibers with 25-45 wt.% thermoplastic polymer at a high temperature; and extruding the fiber-polymer mixture.
Also, the present invention provides a material for internal use, using the composite.
Useful effects of the invention
The original composite consists mainly bagasse, and thus environmentally friendly. Also, it is high due to the coupling between bagasse and thermoplastic polymer as the main components). Thus, it has excellent strength (such as tensile strength, bending strength, impact strength) and elasticity, and also it is not susceptible to swelling. Moreover, even if [he] is exposed to sunlight for a long time, fading does not occur.
Due to the presence of these physical characteristics, the composite is not destroyed and is not separated when a strong external impact. Also, the composite is not deformed, because it does not swell when exposed to liquids such as rain water and drinks) or sunlight.
Also, the original composite has a natural structure and pattern similar to natural wood, and has a light weight, which enables it to be easily transported and erected from his designs. Moreover, it is less vulnerable to attack harmful insects, and thus can be used for a longer time in comparison with the trees is the first composite.
Also, such a composite can be reused by melting, and can be used for the manufacture of products made with the possibility of replacement of various materials for internal use (such as flooring material, wall material, covering material, sound insulating wall and fittings) and treated wood.
Brief description of drawings
The above and other objectives, features and advantages of the present invention will become more clear from the following detailed description, when considered in conjunction with the accompanying drawing, on which:
FIG. 1 is a block diagram showing the method of making a composite material according to a preferred variant implementation of the present invention.
The best option of carrying out the invention
Hereinafter, examples of embodiments of the present invention will be described with reference to the accompanying drawings.
The present invention provides a composite comprising fibers obtained from bagasse and a thermoplastic polymer, and the method of its preparation, in which the composite is environmentally safe, shows high strength and can be used as a material for internal use.
Further, the present invention will be described in detail.
The original composite VK is uchet in itself 55-75 wt.% fibers, obtained from bagasse, and 25-45 wt.% thermoplastic polymer. Also, the composite may optionally include additives in addition to the fibers and thermoplastic polymer.
Bagasse used in the present invention, obtained as a by-product in the refining process of sugar from sugar cane. Bagasse represents the remains after squeezing sucrose from the trunk (stem) sugar cane, and has a white or slightly yellowish color.
This bagasse is quite valuable for use as a material to replace wood and fiber. Especially, since in the preparation of the composite, the replacement of wood-plastic composite that uses the wood is used crop, bagasse can play an important role in improving farm profitability and reducing air pollution caused by the incineration of waste. Also, bagasse obtained after the process of refining sugar from sugar cane, has a density and volume suitable for transportation and storage, and thus can be easily used. The fibers used in the present invention, preferably milled into a fine powder. Here, the fiber has a particle size of from 40 to 120 mesh, preferably from 80 to 100 mesh. Milled fibers preferably have a length to diameter of from 3:1 is about 5:1.
Fiber and thermoplastic polymer is melted at a high temperature, while thermoplastic polymer impregnates the pores of the fibers to provide a fiber-polymer mixture. Meanwhile, when the fibers have a particle size less than 40 mesh, fiber and polymer is not sufficiently United to each other due to the large size of particles fibers. Thus, the polymer or particle fiber may be unevenly distributed. Also, when the fiber has a particle size of more than 120 mesh, when the fibers are mixed with thermoplastic polymer, thermoplastic polymer may be effective to impregnate the pores of the fibers.
Also, when the fibers have a length to diameter is less than 3:1, the polymer material may be effective to impregnate the fiber, which can reduce the wear resistance of the material. On the other hand, when the fiber length to diameter is more than 5:1, it can be difficult to impregnate thermoplastic polymer in the pores of the fibers because of their great length.
Fibers obtained from bagasse, included in the composition in an amount of 55-75 wt.%, preferably 65-75 wt.%. Here, when the fibers included in the composition in an amount less than 55 wt.%, the amount of thermoplastic polymer increases. It is environmentally unsafe. Also, when the fiber is included in the composition in an amount of more than 75 wt.%, the number is termoplastycznego polymer decreases. This reduces the strength of the composite when exposed to water, the composite may be deformed.
thermoplastic polymer is one kind or two or more kinds selected from the group consisting of polypropylene (PP), polyethylene (PE), polystyrene (PS), polyethylene terephthalate (PET) and polyvinyl chloride (PVC). Also, as a thermoplastic polymer, can be used waste plastic.
Also, fiber-polymer mixture made from fibers and a thermoplastic polymer, may optionally include an additive. The additive is included in the composition in an amount of 8-10 weight parts relative to 100 weight parts of the fiber polymer.
Supplement is one kind or two or more kinds selected from the group consisting of binder, antioxidant, UV stabilizer, UV absorber, lubricant, mineral filler, dye pigments, flame retardant additives, thermo stabilizer and foaming agent. The original composite can be used for the manufacture of material for internal use, such as flooring material, wall material, covering material, sound insulating wall and furniture, and here, kind of additives varies according to the type of material for internal use.
Material for internal use includes the materials for internal use within and outside of a building.
For example, when the original composite is used for the manufacture of flooring material, 1-2 parts by weight of UV stabilizer, 1-2 parts by weight of UV absorber, 2-4 parts by weight of the coloring matter and 1-2 parts by weight of foaming substances are used relative to 100 parts by weight of the fiber polymer. When the composite is used for the manufacture of cladding material, the covering material or sound-proof wall, 0.5 to 2 parts by weight of mineral filler, 2-4 parts by weight of a flame retardant additive and 2-4 parts by weight of binding can be used relative to 100 parts by weight of the fiber polymer. Also, when the composite is used for reinforcement, 1-2 parts by weight of antioxidant, 1-2 parts by weight of thermo stabilizer, 2-4 parts by weight of a flame retardant additive, 1-2 parts by weight of lubricants and 1-2 parts by weight of the coloring matter can be used relative to 100 parts by weight of the fiber polymer. However, the present invention is not limited, and other additives can be optionally used for the manufacture of material for internal use.
Among the additives, a binder is used to improve the coupling strength between the fibers and thermoplastic polymer, antioxidant blocks the oxygen and ultravio movoe radiation and prevents discoloration, UV stabilizer to prevent discoloration caused by UV radiation, UV absorber absorbs UV radiation and lubricant improves the distribution of fibers in the form of fine powder. Also, mineral filler prevents deformation caused by impact, heat or stress, the dye stains the product, fire-retardant additive is used to provide heat-resistant product, thermo stabilizer reduces thermal degradation during manufacture or use, and foaming substance spanaway fiber.
The original composite made with reusable because it can be reused by melting.
As shown in FIG. 1, an original method for making a composite material includes the steps: preparation of fibers (S110), mixing in the melt 55-75 wt.% the prepared fibers with 25-45 wt.% thermoplastic polymer at a high temperature (S120) and extruding the fiber-polymer mixture (S130). Step (S110) preparation of fibers includes the steps of preparing bagasse having less than 5 wt.% the moisture content of de-hydration bagasse, obtained as a by-product of the process of refining sugar from sugar cane; collecting fibers location prepared bagasse on a conveyor belt, having set the Lenna her net, and filtration bast; softening of the collected fibers are added to water and ramming fibers; and grinding the softened fibers using grain peeling machine. Also, between the S120 and S130 may be further included the step of introducing additives.
At step (S110) preparation of fibers, the fibers are derived from bagasse. In General, bagasse contains 20-40 wt.% water immediately after the process of refining sugar. However, in the present invention, in order to separate the bast (core) and fiber, the moisture content in bagasse should be less than 5 wt.%. If the moisture content is equal to or more than 5 wt.%, bast is attached to the fibers. Thus, it can be difficult to separate only the obtained fiber, and product quality can be reduced due to bubbles in the inside of the composite.
Digidrirovanny bagasse with less than 5 wt.% moisture content is moved on a conveyor belt, having mounted on it a grid, at the same time share on the bark and fiber. On the conveyor belt, set the grid size 4,0-6,0 mm Thus, the bast passes through the net, and 90% or more of the bark is removed, while fiber does not pass through the grid and moves along the conveyor belt, in order to gather in one place. Bast, separated through the net, is about 1/3 of bagasse, and fiber - about 2/3 of bagasse.
Secadora to have the size of the cells, through which the people can go and fibers cannot pass, and preferably has a size 4,0-6,0 mm Mesh can be installed on a conveyor belt in various ways without specific limitations.
Conveyor belt is usually a little shaken, and thus preferred in the process, in which bagasse is divided into the bark and fiber. However, before placing it on the conveyor belt, bagasse more preferably a little shaken, to facilitate separation of the bark from the fibers.
The fibers are separated, as described, washed with sufficient amount of water. This is done to remove dust contained in the fibers, and foreign substances (such as sugar), attached to the fibers after the process of refining sugar, and can be selectively performed in accordance with the state of the industry. Also, the amount of leaching may vary. In traditional technology, needed a washing step using a chemical substance. However, for the present invention is sufficient washing with water. After washing, the water and the fibers are collected, and then performs the following steps. Water used for washing, reused by cleaning with a filter.
In the fiber from which it was removed foreign substance, again add water, and they softened ramming and what selenium. The moisture content is not limited to a particular sign. However, for convenience of compacting, water is added so that the weight ratio of fiber to water is about 1:1. In the process of softening water makes fiber hydrated. This allows softening of the fibers without the chemical substance. Water used in this step can also be reused.
Means for softening are not limited to specific means. However, instead of a metal machine, wood machine, for example, a wooden mortar, preferably used when ramming a metal tool fiber can be deeply corrupt or compressed and crushed. Pressure for stage softening can be changed from 1 to 2 kgf/cm2in accordance with the number of fibers.
The softened fiber dehydrations and grind grain peeling machine (refining) so that they can have a particle size of 40-120 mesh, and the ratio of length to diameter of from 3:1 to 5:1. As grain peeling machine, can be used to machine conventionally used in the art. In General, wood is ground grain peeling machine in the forward direction. However, in the present invention, more preferably to result in the movement of grain peeling machine in the reverse direction, so that the fiber could become quite loose.
B the Gass solid. Thus, at the stage where a sufficient amount of water absorbed by bagasse, bagasse can be softened by being crushed. In grain peeling machine, the disk can rotate in the opposite direction instead of straight direction, in order to twist the fiber. This may allow the fibers to be more loose and flowing, and thus improve the strength of connections between the fibers. Accordingly, because the fibers become loose power connection between the fibers is increased in the preparation of the composite, thus increasing the tensile strength.
At the step (S120) mixing fibers with a thermoplastic polymer, 55-75 wt.% fibers prepared at S110, are mixed in the melt with 25-45 wt.% thermoplastic polymer at a high temperature of 150-200°C, in order to provide fiber-polymer mixture. In the prepared fiber-polymer mixture, thermoplastic polymer is absorbed into the pores of loose fibers to improve the strength of connections between the fibers and thermoplastic polymer, and to provide a fiber-polymer mixture of high density.
At step (130) extruding the fiber-polymer mixture, the fiber-polymer mixture prepared in S120, extruded by using thermocompression at 130-140°C, 20-25 kg/cm2within 15-20 minutes, to provide the composite. The composite is formed of molded the internal structure, and is cooled with cooling water in order to save the form. Then, the material for internal use can be obtained for the desired use (indoors or outdoors).
After step S120, the step of introducing an additive in accordance with the type of material for internal use may additionally be added.
Further, the present invention will be described with reference to Examples. However, the following Examples are only for illustrative purposes. Specialists in the art it is clear that various modifications, additions and substitutions are possible without departure from the scope and essence of the invention as disclosed in the accompanying claims.
Bagasse was prepared so that it could be 15 wt.% moisture content and placed on the conveyor belt is equipped with a mesh size of 6.0 mm, in order to separate the bast. Then, were obtained fibers having a size greater than 6.0 mm, and the remaining fibers and bark were separated.
Here, the fibers comprise about 2/3 of bagasse. The obtained fibers were cut into a size of 3 cm and washed in order to remove the remaining sugar and dust. The washed fiber was utrambovyvat and were ground together with water in the ratio 1:1 for 5 minutes at 2 kgf/cm2to soften. Here, the quality of the car, instead of a metal machine, which had been the wooden mortar.
Then, the softened fibers were milled grain peeling machine in the refining process. Here, the grinding was performed in the opposite direction instead of straight direction so that the fiber could be loose. Milled fibers have a particle size of 90 mesh, and the ratio of length to diameter of 4:1.
70 g of the fibers were mixed in the melt with 30 g of polypropylene at 170°C and extruded at 140°C at 20 kgf/cm2within 20 minutes, to provide the composite.
The composite was obtained similarly to the composite of Example 1, except that prior to the extrusion process, 1 g of the UV stabilizer, 2 g of UV absorber, 4 g of a dye stuff and 2 g of foaming substances were added.
The composite was obtained similarly to the composite of Example 1, except that prior to the extrusion, 2 g of mineral filler, 3 g of a flame retardant additive and 3 g of binder were added.
Comparative example 1
The composite was obtained similarly to the composite of Example 1, except that there were used fibers having a particle size of 160 mesh.
Comparative example 2
The composite was obtained similarly to the composite of Example 1, except that used were the fibers having a length to diameter 6:1.
Comparative example 3
The composite was sex is Yong similar to the composite of Example 1, except that instead of fibers, 70 g wood was used.
Tensile strength (MPa): measurement tensile strength (nominal value: 12 MPa or more) in accordance with KS M 3006 (test method's ability to plastic strain),
bending strength (MPa): measurement of Flexural strength (nominal value: 61~82 MPa or more) in accordance with KS M ISO 178 (test method of plastic flexibility),
the modulus of elasticity in bending (MPa): measurement of modulus of elasticity in bending (nominal value: 2100 MPa or more) in accordance with KS M ISO 178 (test method of plastic flexibility),
adsorption capacity (%): measurement vlagopoglotiteli capacity (nominal value: 3% or less) in accordance with KS M 3015 (test method plasticity),
impact strength (kg*cm/cm2): measurement of impact strength (nominal value: 12 kg*cm/cm2or more) in accordance with KS M 3055 (test method for impact strength of plastics Izod)
resize (%) wetting: measuring changes size when wetted (nominal value: the longitudinal direction of 0.3% or less, the transverse direction is 2% or less) in accordance with KS F 3126 (test method changes the size of the decorative wood plate).
Table 1 below shows a comparison between an Example of the mi 1-3 and Comparative examples 1-3 in the tests.
|Comparative example 1||Comparative example 2||Comparative example 3|
at break (MPa)
Flexural strength (MPa)
of elasticity at
|the rate of change|
As noted in table 1, the composites of Examples 1-3 have excellent strength (such as tensile strength, bending strength, impact strength) and elasticity, and do not inflate, undergoing a small change in size.
Meanwhile, it was found that as the particle size of the fiber and the ratio of length to diameter of composites of Comparative examples 1 and 2 were not in compliance with the option of performing the present invention, strength and elastic modulus were reduced. Moreover, due to the large size changes, the composite was bent or elongated. Also, compared with Examples 1-3, the composites of Comparative examples 1-3 showed high adsorption capacity. Thus, it may be found that the wear resistance of the composite was reduced.
Also, after the composites of Examples 1-3 and Comparative examples 1-3 were subjected to UV radiation for 30 days, discoloration was observed with the naked eye. As a result, compared with composites using fiber obtained from bagasse, composite, using wood from Comparative example 3, gradually becomes yellowish.
1. The composite containing 55-75 wt.% fibers and 25-45 wt.% thermoplastic polymer, in which the fibers are derived from bagasse and have a particle size of 40-120 mesh, the pores of the fibers impregnated with a thermoplastic polymer forming the fiber-polymer mixture.
2. The composite according to claim 1, containing 65-75 wt.% fibers and 25-35 wt.% thermoplastic polymer.
3. The composite according to claim 1, in which the fibers have a particle size 80-100 mesh.
4. The composite according to claim 1, in which the fibers have a length to diameter of from 3:1 to 5:1.
5. The composite according to claim 1, in which thermoplastic polymer is selected from the group consisting of polypropylene, polyethylene, polystyrene, politi is interaffiliate and polyvinyl chloride.
6. The composite according to claim 1, which additionally contains at least one additive selected from the group consisting of binder, antioxidant, UV stabilizer, UV absorber, lubricant, mineral filler, dye pigments, flame retardant additives, thermo stabilizer and foaming substance, and an additive is included in the composition in an amount of 8-10 parts relative to 100 parts of fiber-polymer mixture.
7. The method of preparation of a composite containing the steps:
preparation of bagasse with less than 5 wt.% moisture, de-hydration bagasse, obtained as a by-product in the refining process of sugar from sugar cane;
collection fibers location prepared bagasse on a conveyor belt, having mounted on it a grid, and filtration bast;
softening of the collected fibers are added to water and ramming fibers;
grinding the softened fibers, using grain peeling machine;
mixing in the melt 55-75 wt.% the prepared fibers with 25-45 wt.% thermoplastic polymer at a high temperature; and
extruding a fiber-polymer mixture.
8. The method according to claim 1, in which the grid is used at the stage of collection fibers, has a size 4,0-6,0 mm
9. The method according to claim 7, in which the step of grinding the fibers running in the opposite direction grain m the bus.
10. The method according to claim 7, in which at the stage of mixing in the melt fibers with a thermoplastic polymer, the temperature is in the range from 150 to 200°C.
11. The method according to claim 7, in which the step of extruding the fiber-polymer mixture extrusion is performed at 20-25 kg/cm2at 130-140°C for 15-20 minutes
12. Material for internal use containing composite according to claim 1.
SUBSTANCE: invention relates to olefin-containing compositions for producing wood materials and crude wood materials, use of olefins to endow crude wood materials with hydrophobicity and a method of producing wood materials from crude wood materials. The composition contains crude wood materials from lignocellulose in form of fibres, chips or shavings, as well as olefins or a wax composition. The wax composition contains olefins and additionally paraffin wax in form of long-chain saturated hydrocarbons. The olefins contain an average of 24-50 carbon atoms; more than 50 mol % are alpha-olefins; have a maximum of carbon chain length distribution between 24 and 40 carbon atoms. Bringing crude wood materials (shavings, chips, fibres) into contact with said olefins and optionally together with paraffin wax provides hydrophobisation thereof. Binder is added to said composition to obtain fibreboards, wood chipboards and oriented strand boards.
EFFECT: invention enables to obtain end products with good hydrophobic properties.
23 cl, 2 tbl, 2 ex
FIELD: wood working industry.
SUBSTANCE: wood and polymer composition contains a wood filler and thermoplastic wastes. The wood filler is bark of conifers exposed to serial extractive treatment with water or aqueous solution of sodium hydroxide or isopropyl alcohol. The thermoplastic wastes are wastes of polystyrene or polyvinyl chloride.
EFFECT: invention makes it possible to improve physical and mechanical indices of a wood polymer composition, to expand raw resources for manufacturing of this composition and to reduce its prime cost.
1 dwg, 2 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to production of construction materials, particularly, to fabrication of compacted wood biological composite materials. Proposed method comprises making biological composite material including biological binder and saw dust. Produced material is dried to make a mat by cold compaction and subjected to hot forming. Saw dust is mixed with biological binder based on culture broth obtained in cultivation of Leuconostoc mesenteroides bacterium on nutrient medium. Said medium consists of the mix of molasses, wastes of sugar production, and lactoserum taken in the ratio of 2:2:1 at temperature 24-26°C for 72-96 hours in static conditions with addition of liquid glass in concentration of 2.5 wt %.
EFFECT: moisture-resistant nonpolluting materials without phenol compounds.
SUBSTANCE: invention relates to a biodegradable thermoplastic composition for producing materials and articles which are biodegradable in natural conditions. The biodegradable thermoplastic composition contains lignocellulose filler, a binding agent and polyethylene as a polymer base. The binding agent is a copolymer of ethylene and vinyl acetate. The lignocellulose filler used is in form of cheap manufacturing wastes with no food and feed value and natural materials selected from flax shive, sunflower husks, sodium lignosulphonate, leaves and straw.
EFFECT: composition is characterised by high biodegradability and meets requirements for materials for processing using conventional processes and equipment.
5 cl, 3 tbl, 1 dwg
SUBSTANCE: invention relates to a method of producing wood materials from lignocellulose-based grinding products, with low emission of volatile organic compounds and aldehydes. The lignocellulose-based grinding products and an adhesive based on amino plastic, diisocyanates, polyurethanes and/or tannin-formaldehydes or mixtures thereof are prepared. The lignocellulose-based grinding products are mixed with the adhesive and the mixture is pressed during heat treatment. Before pressing and after splitting into fibres or processing into chips, a combination is added to the grinding products, said combination comprising at least one component having buffer capacity, selected from a hydrosulphite salt or sulphite salt. At least one component is optionally added, said component being selected from urea, a urea derivative or hydroxides of alkali, alkali-earth metals or ammonia.
EFFECT: wood material obtained using the method have low emission of volatile organic compounds and aldehydes, particularly formaldehyde, during synthesis thereof and during prolonged use thereof.
5 tbl, 3 ex
SUBSTANCE: method involves preparation of a polymer composition based on PVC, an impact strength modifier, a heat stabiliser, a binding agent and addition of modified wood flour. The wood flour is obtained by pre-saturating wood flour with aqueous solutions of binding agents of silica sol or carbon nanotubes, stirring the obtained mixture and drying.
EFFECT: wood-polymer materials based on the obtained highly filled rigid polyvinyl chloride composition have high tensile strength and thermal stability, low viscosity, flammability and water absorption.
FIELD: process engineering.
SUBSTANCE: invention relates to production of wood-filled composite materials based on timber wastes and mineral binders. Proposed method comprises mixing wood filler with binder. Filler is treated in tight chamber in atmosphere of flue gases at 190-200°C for 50-60 minutes. Then, prior to mixing, filler is processed in plasma-forming gas flow in discharge chamber at high-frequency generator power of 200-600 W and vacuum of 100-130 Pa for 250-280 s. Air is used as said plasma-forming gas fed at flow rate of 0.08-0.12 g/s. After mixing of filler and binder, molding and heat treatment are performed.
EFFECT: higher strength.
1 tbl, 2 ex
SUBSTANCE: invention relates to the industry of construction materials and specifically to compositions of mixtures for making heat-insulating articles used in building walls, floors and partition walls. The crude mixture for producing heat-insulating materials contains the following in wt %: wood aggregate 69.0 - 78.0, hydrolised lignin 1.0 - 2.0, ground thermoplastic wastes 20.0 - 30.0.
EFFECT: reduced toxicity of heat-insulating articles.
FIELD: process engineering.
SUBSTANCE: invention relates to woodworking and may be used in production of fireproof particle boards. Proposed composition comprises wood particles, amidophosphate as fire-retardant additive, binder including resin and formaldehyde solution as additive. Resin binder contains melamine-phenolic resin and, additionally, latent catalyst while outer layers binder contains melamine-phenolic resin, latent catalyst and surfactant.
EFFECT: high-efficiency composition, higher quality of particle boards, better manufacturability.
2 cl, 3 tbl, 1 ex
SUBSTANCE: invention relates to a biodegradable thermoplastic composition. The composition contains polyethylene, wood flour and functional additives, such as concrete stone, polyvinyl alcohol, a compatibilising agent and nanoparticles. The compatibilising agent is primarily an ethylene and vinyl acetate copolymer and the nanoparticles are chemically deposited iron hydroxide or calcium sulphate nanoparticles.
EFFECT: use of cheap and readily available wood mechanical processing wastes, with high concentration thereof, as biodegradable material in the disclosed composition allows for normal use of articles in ordinary conditions, as well as the given rate of biodegradation in disposal conditions after use; wherein polyethylene in the composition can be used in form of manufacturing and/or household wastes.
3 cl, 1 tbl
SUBSTANCE: adhesive composition in form of an aqueous dispersion with content of solid substances of 10-40 wt % with respect to the adhesive composition, wherein 100 wt % of the solid substance contain a) 1-20 wt % bisphenol-A-epoxy novolac, b) 0-20 wt % of a completely or partially blocked isocyanate, c) 60-92 wt % resorcinol-formaldehyde latex (RFL).
EFFECT: invention enables to obtain a composition with a long working life, good wettability and adhesion on reinforcing inserts.
15 cl, 2 tbl, 2 ex
SUBSTANCE: invention relates to an aramid particle containing a peroxide radical chain polymerisation initiator, wherein the particle contains 3-40 wt % of a radical chain polymerisation initiator with respect to the weight of the aramid particle. The peroxide initiator is introduced into the aramid particle by saturating the aramid particle with a solution of the peroxide initiator in an organic solvent with subsequent evaporation of the latter. The aramid particle is fibre, crushed fibre, staple fibre, fibrid, fibril, powder or granules. Also described is an elastomer composition with aramid particles, an article made from skimmed latex which contains the elastomer composition with aramid particles, an industrial rubber article and a method of curing an elastomer in the presence of an aramid particle.
EFFECT: reduced Payne effect and hysteresis of rubber or other elastomeric articles, improved adhesion properties.
12 cl, 16 tbl, 3 ex
FIELD: machine building.
SUBSTANCE: invention relates to antifriction composite materials based on thermoplastic polymers and may be used in making highly loaded friction assemblies, particularly, to seals of ship ball valves. Material consists of (in wt %) aromatic partially crystalline linear polymer PEEK 450 PF with reinforcing filler from minced fiber of carbon fabric Ural T-22-30-35. Invention allows friction assembly bearing capacity of 0.8-4.0 MPa at sliding speed of 12 m/c to 0.5 m/s, water absorption of not over 2%, compression resistance of at least 250 MPa, ultimate stress at static flexure at least 160 MPa, and impact strength of at least 21 kJ/m2.
EFFECT: improved performances.
5 dwg, 1 tbl, 2 ex
SUBSTANCE: invention pertains to a particle comprising a composition containing a matrix and a peroxide or azo radical initiator, as well as rubber-coated products, tyres, tyre treads and belts containing particle-elastomer systems. The particle is selected from aramid, polyester, polyamide, cellulose fibre and glass fibre. The matrix is selected from an extruded polymer, wax or mixture thereof.
EFFECT: invention improved mechanical properties - modulus of elasticity, hardness and wear-resistance.
20 cl, 37 tbl, 7 ex
SUBSTANCE: absorbent article has a liquid permeable top cloth, a back cloth and an absorbent core in between. The absorbent core contains a peroxy compound and a zinc salt not saturated with a hydroxylated fatty acid having 8-18 carbon atoms. In particular, the peroxy compound is hydrogen peroxide and the zinc salt is zinc ricinoleate. The core contains a mixture of cellulose fibres. The absorbent article is obtained by treating cellulose fibres of the absorbent core with a solution of a peroxy compound and a zinc salt. The cellulose fibres are first treated with a solution of peroxy compound and then with a solution of zinc salt.
EFFECT: use of the combination of organic zinc salt and peroxy compound in the absorbent article significantly reduces formation of bad smell, such as ammonia smell.
17 cl, 2 ex, 1 tbl
SUBSTANCE: invention can be used in machine-building to make wear-resistant rod packing and cylinders of hydraulic devices instead of rubber fabric chevron seals, as well as for articles for construction purposes in mining, oil and gas extraction and chemical industry. The rubber mixture based on cis-isoprene rubber SKI-3 - 100 pts.wt contains the following, pts.wt: ultra-high molecular weight polyethylene, modified 7 wt % carbonaceous material carbosil - 170, viscose fibre filler, saturated with latex-resorcinol-formaldehyde composition - banavis - 80, active technical carbon P-234 - 30, petroleum oil - softening agent - netoxol 5, zinc oxide - 5, stearic acid - 1, sulphur - 3, sulfonamide C 1.6, diaphene antiageing agent FP-1, antiozonant-acetonanil N - 1.
EFFECT: articles obtained from the rubber-polymer material have extremely high rigidity, frame structure, resistance to frictional forces, weak acid and alkaline solutions, while partially retaining elasticity, high hardness under intense wear conditions.
SUBSTANCE: invention relates to a method of producing frictional polymer materials and can be used in making brake shoes of railway wagons and locomotives, for motor transport, cranes, clutch plates and other articles. The method is realised by processing butadiene or butadiene-nitrile rubber on plastification equipment and mixing the rubber with curing agents, with fibre and powdered filling materials. Aromatic polyamine is simultaneously added with curing additives. The aromatic polyamine is an aniline-formaldehyde condensate consisting of 75% isomers of diaminodiphenylmethane and 3-4 benzene-nuclear primary amines bound by methylene bridges. The fibre filler is pre-saturated for 15 minutes with aqueous solution of epoxy resin which is a product of reacting a mixture of diane and aliphatic epoxy resins with glycols or derivatives thereof, in ratio A:B between 95:5 and 60:40, and then dried to moisture not higher than 1%. The composition of the material contains the following in pts. wt: rubber 100, aromatic polyamine 2-20, sulphur 1-15, thiuram 0.04-2.0, 2-mercaptobenzothiazole 0.3-4.0, fibre filler 15-100, powdered filler 10-100.
EFFECT: invention improves strength characteristics of frictional polymer materials and increases labour safety.
2 tbl, 7 ex
SUBSTANCE: invention relates to an adhesive composition in form of an aqueous dispersion with content of solid substance from 1 to 50 wt %, as well as to a method of treating reinforcing layers with said composition, particularly a cord for tyres, and to a method of producing reinforced polymeric products by treating reinforcing layers. The adhesive composition contains: (a) 0.001-5 mol epoxide compound with molecular weight 50-290 in a form dissolved in water, per 1000 g of the overall composition, (b) 0.1-20 wt % completely or partially blocked isocyanate in form of a solid substance, (c) 0.1-40 wt % resorcin-formaldehyde latex in form of a solid substance and (d) water.
EFFECT: preparation of an adhesive composition which can be used in form of a single-step system, having good wettability and good adhesion, and high rate of reaction with non-activated fibres, particularly on polyethyleneterephthalate fibres.
15 cl, 1 ex, 2 tbl
SUBSTANCE: invention relates to polymer compositions, particularly to rubber mixtures for making tyre treads and can be used in the tyre industry. The polymer composition contains the following components, in pts. wt: polybutadiene rubber SKD 20-30, polyisoprene rubber SKI-3 70-80, zinc oxide 4-5, technical carbon N339 50-55, oleic acid 1.5-2.0, sulphur 1.5-2.2, sulfenamide T 1.0-1.5, diaphene PP 1.0-1.5, Pikar hydrocarbon resin 2-3, oil PN-6s 10-15, Omsk-10 wax 1.5-2.0, acetonanyl N 1.5-2.0, santogard PVI 0.1-0.15, 3-15 mm long pieces of waste hybrid saturated cords 1.5-20.0.
EFFECT: increased extension elongation, bouncing elasticity and lower brittleness temperature.
2 cl, 4 tbl
SUBSTANCE: present invention pertains to rubber industry, particularly to composite material based on rubber mixtures, containing methylstyrene and divinyl rubber, and can be used for making sluper and rail pad shock-absorbers of railway tracks. Compound contains the following components, wt %: crushed rubber coated polyamide cord with fibre length 10-15 mm-17.0-18.5, rubber compound based on methylstyrene and divinyl rubber, containing a vulcanising group and inactive technical carbon - 77-78, particulate filler material-granulated sphate spew from the stage of vulcanisation of the shock-absorber pads-2, granulated rubber crumbs - 2.0-3.5.
EFFECT: increase in the resources of working capacity of the cushion bolsters, friction coefficient on the steel per-unit-volume of resistance of the electric current.
FIELD: manufacturing processes.
SUBSTANCE: bamboo scrimber and method of its manufacture are proposed. Bamboo scrimber are produced by pressing of bamboo strips impregnate with a binder, and subjected to heat treatment, and in each bamboo strip for the entire thickness a lot of cuts are made, passing along the fibers of bamboo scrimber.
EFFECT: bamboo scrimber advantages include low water absorption, high dimensional stability and biological durability, which is particularly suitable for use as the outer material.
16 cl, 10 dwg, 6 ex