Wood-fibre board and method of its production

FIELD: process engineering.

SUBSTANCE: invention relates to woodwork. Wood-fibre plate comprises wood fibres, polyacrylamide resin representing an amphoteric-ionic resin containing monomers with cation groups and monomers with anion groups related to 7:3 - 3:7 in molar ratio that features molecular weight of 800000 to 3000000, and cationic paraffin. Wood-fibre board production comprises application of suspension with concentration of solids of 2-3 wt % and pH 3-5 and addition of polyacrylamide resin and paraffin to said suspension.

EFFECT: higher strength of and water resistance.

3 ex, 1 tbl, 4 cl

 

The LEVEL of TECHNOLOGY

1. The technical field

The present invention relates to a wood-fiber plate used in the interior decoration of vehicles, building materials, furniture, etc.

2. Description of the prior art

Usually the wood is ground into wood chips through a crusher or similar device, the resulting wood chips are treated with steam and fibrillary using a refiner or similar device with getting fibreboard of wood chips. For example, in the patent application JP 2001-3300 described a method of manufacturing a wood-fiber plate by forming a sheet from a slurry of starting materials, in which the dispersed wood fiber, dehydration molded sheet with application of vacuum, using a cylinder machine for forming sheets, followed by molding and drying to obtain, therefore, a wood-fiber plate.

The method of manufacture, which is described in the patent application of Japan JP 2001-3300 requires the use of a binder for binding the fibers together. In the patent application of Japan JP 2001-3300 described starch thickeners, phenolic resins, melamine resins, urea resins or similar materials, as examples of binders. Among them used phenolic resin e point of view so the barb and water resistance.

However, the problems of odor and volatile organic compounds emitted phenolic resins, concern amid growing awareness of environmental problems in recent years. It is desirable, therefore, to wood-fiber plates did not contain phenol resins.

The applicants have already filed a patent application in Japan, published under the number JP 2010-121058, which refers to a wood-fiber plate, not containing phenolic resin.

Wood-fiber plate according to the patent application of Japan JP 2010-121058 made using acrylic resin and epoxy resin that does not contain bisphenol a, instead of the phenolic resin. Therefore, the Board does not have the smell of phenol and volatile organic substances of very little.

According to the patent application of Japan JP 2010-121058, however, in a wood-fiber plate using two kinds of resins, and acrylic resin and epoxy resin that does not contain bisphenol a, as binders, with additional paraffin to improve water resistance. Thus, there can be complications associated with equipment and processes that need to be addressed.

BRIEF description of the INVENTION

Thus, the present invention is to provide a wood-fiber plate and method of its manufacture, and plates which must not contain phenolic resin, should be simple to manufacture and possess a Flexural strength and water resistance. comparable with similar characteristics fiberboard made with the inclusion of phenolic resin.

In the present invention proposed wood-fiber plate, which only contains wood fibers, polyacrylamide resin and paraffin. In wood-fiber plate according to the present invention, the polyacrylamide is afterno-ionic resin and contains monomer units with cationic groups and monomer units with anionic groups at a ratio of from 7:3 to 3:7, based on the molar ratio, and has a molecular weight of 800000 to 3000000; and paraffin, which is cationic. The content of polyacrylamide resin is from 0.1 to 0.6 wt.% with respect to the total solid content in wood fibers; and the paraffin content is from 0.2 to 0.9 wt.% with respect to the total solid content in wood fibers. Wood fibers are intertwined, and polyacrylamide resin and paraffin fill the gaps between the wood fibers.

According to the present invention is a wood-fiber plate may contain fibers obtained by steam treatment and atrial wood waste wood-fiber plates, in an amount less than 10 wt.% on the to compared to the total solids content in the wood stove. Thus, it is possible to achieve effective utilization of wood waste by incorporating fibres obtained from wood waste wood-fiber plates.

In the present invention, a method of manufacturing a wood-fiber plate. According to the present invention is provided a method of manufacturing a wood-fiber plate, which includes the following stages: obtaining a slurry by dispersing wood fibers in water; obtaining carpet by adding only paraffin and acrylamide resin to the resulting suspension and forming sheets; and hot pressing the resulting billet, moisture or humidity control of the carpet, followed by drying. At the stage of receipt of the suspension, the suspension is prepared by obtaining the concentration of solids from 2 to 3 wt.% and the achievement of pH from 3 to 5. At the stage of obtaining a carpet type amphoteric polyacrylamide resin, which is afterno-ionic resin containing monomer units with cationic groups and monomer units with anionic groups in a ratio of from 7:3 to 3:7, based on the molar ratio and having a molecular weight of 800000 to 3000000, in an amount of 0.1 to 0.6 wt.% with respect to the total solid content in wood fibers, and add cationic paraffin in an amount of from 0.2 to 0.9 wt.% in relation to the total is the obsession of solid substances in wood fibers. According to the present invention a method of manufacturing a wood-fiber plate may provide for the inclusion of fibres obtained by steam treatment and atrial waste wood fiberboard of wood waste in quantities less than 10 wt.% with respect to the total solid content in the wood stove.

According to the present invention fibreboard only contains wood fibers, polyacrylamide resin and paraffin and, accordingly, does not contain a phenolic resin. In addition, the wood fibers are intertwined, and polyacrylamide resin and paraffin fill the gaps between the wood fibers. Thus, wood-fiber plate has the advantage in terms of Flexural strength and water resistance, which is comparable with similar characteristics fiberboard made with the inclusion of phenolic resin. According to the present invention a method of manufacturing a wood-fiber plate provides for the use of only one polyacrylamide resin as a binder. Therefore, fibreboard is easy to manufacture and has the advantage in terms of Flexural strength and water resistance, which is composed with similar characteristics to the wallboard or the, made with the inclusion of phenolic resin.

DESCRIPTION of the PREFERRED IMPLEMENTATION OPTIONS

Below are specific implementations of the present invention.

According to the present invention fibreboard only contains wood fibers, polyacrylamide resin and paraffin.

According to the present invention of wood fibres obtained by grinding wood into wood chips using a grinder or similar device, the resulting wood chips are treated with steam and steamed chips fibrillary using a refiner. Wood fiber can also contain wood fiber in the form of fibres obtained by steam treatment and atrial waste wood fiberboard from wood waste.

Polyacrylamide resin is amphoteric, contains monomers with cationic groups and monomers with an anionic group at a ratio of from 7:3 to 3:7, based on the molar ratio, and has a molecular weight of 800000 to 3000000. Examples of monomers with cationic groups include, for example,

2-(meth)acryloyldimethyltaurate salt or

2-(meth)acryloyldimethyltaurate salt,

diallyldimethylammonium salt, delaminate connection or similar substance. Examples of monomers with an anionic group in luchot, for example, α, β-unsaturated carboxylic acids and their salts. In amphoteric polyacrylamide resin, the ratio of monomers with cationic groups and monomers with an anionic group is from 7:3 to 3:7, based on the molar ratio. In the wood fibers and paraffin can be added during the manufacturing process. In the process of manufacturing fiberboard, in particular wood fibers are first dispersed in water to obtain a suspension having a pH of 3-5, and then in the slurry, add paraffin and acrylamido resin. Thus the surface potential of the wood fibers is anionic, while paraffin, described below, is cationic. Thus, amphoteric polyacrylamide resin can be added as wood fibers, and the wax. In addition, in water with a pH of 3-5, in which the dispersed fiber can be formed flakes by setting the ratio of the content of monomers with cationic and groups and monomers with anionic groups are equal in the range from 7:3 to 3:7, PA the basis of the molar ratio. Therefore, wood fiber can be effectively dehydrated, and getting the carpet fibre boards can be a good solution. Hereinafter, may be with good efficiency added paraffin wax thereby improving the water resistance of the wood is covered. Molecular weight polyacrylamide resin is 800000-3000000, resulting in a constant viscosity in the liquid state. Thus, wood fiber and paraffin can be added without any difficulty. If the molecular weight of polyacrylamide resins is less than 800000, flakes, formed by the addition of wood fibers or paraffin are small, and the productivity is low. If the molecular weight exceeds 3000000, the formation of solid flakes causes an uneven distribution of wood fibers, polyacrylamide resin and paraffin in a wood-fiber plate, obtained after dehydration. This can reduce a bending strength of wood-fiber plates.

Paraffin is cationic. Therefore, the wax can easily be supplemented amphoteric polyacrylamide resin. The surface potential of the wood fibers is anionic and therefore, the paraffin can be readily fixed on the surface of the fibreboard.

According to the present invention fibreboard contains 90 wt.% or more, relative to the total solids content in the wood stove, fibers, obtained by steam treatment and atrial wood, from 0.1 to 0.6 wt.% polyacrylamide resin relative to the total solids content in the wood in which larnach and from 0.2 to 0.9 wt.% paraffin wax relative to the total solids content in wood fibers. Fiber content obtained by steam treatment and atrial waste wood fiberboard from wood waste, can be less than 10 wt.% with respect to the total solid content in the wood stove. As waste wood fiberboard of wood waste is preferably used parts fibreboard, defective plate or similar material, formed in the manufacturing process, because in this way it is possible to reduce losses in the manufacturing process.

The rationale for the establishment of the content of polyacrylamide resin and the range from 0.1 to 0.6 wt.%, with respect to the total solid content in wood fibers, is that the content less than 0.1 wt.% leads to the insufficient addition of wood fibers and wax, while the content of polyacrylamide resin more than 0.6 wt.% calls only increase in value. The reason for the establishment of the content of paraffin equal in the range of 0.2 to 0.9 wt.%, with respect to the total solid content in wood fibers, is that when the paraffin content of less than 0.2 wt.% the water resistance of wood-fiber plates is low, while when the content is higher than 0.9 wt.% there is a lack of interlocking wood fibers among themselves, and to reduce the W a bending strength of wood-fiber plates.

According to the present invention a method of manufacturing a wood-fiber plate includes the following stages: obtaining a slurry by dispersing wood fibers in water; obtaining carpet by adding only paraffin and acrylamide resin to the resulting suspension and forming sheets; and hot pressing the obtained carpet, moisture or humidity control of the carpet, followed by drying.

At the stage of obtaining a slurry by dispersing wood fibers in water wood grind, then steamed and fibrillary in fibrillose device, such as a refiner, and the resulting wood fiber is dispersed in water to obtain a suspension, the concentration of solids in which ranges from 2 to 3 wt.%, and the pH is from 3 to 5. Wood fiber can be obtained by the joint use of wood and waste wood fiber boards. The concentration of solids in the suspension is from 2 to 3 wt.%, since the concentration of solids ranging from 2 to 3 wt.%, promotes the dispersion of the wood fibers in water. If the concentration of solids in the suspension exceeds 3 wt.%, the dispersion of the wood fibers is uneven, while when the concentration of solids is below 2 wt.% requires a significant amount of water is the Reason for establishing the pH of the suspension is equal to within 3 to 5 is that wood fiber and paraffin effectively supplemented amphoteric polyacrylamide smolen. containing monomers with cationic groups and monomers with an anionic group in a ratio of from 7:3 to 3:7, based on the molar ratio. When the pH of the polymer in the range from 3 to 5 may occur effective formation of flakes.

At the stage of obtaining the carpet by adding only paraffin and acrylamide resin to the resulting suspension and forming sheets, add amphoteric polyacrylamide resin containing monomers with cationic groups and monomers with anionic groups in the ratio or 7:3 to 3:7, based on the molar ratio and molecular weight of the resin is from 800000 to 3000000, and also add paraffin. which is cationic. Paraffin and polyacrylamide resin may be added simultaneously. Alternatively, the first may be added to the paraffin, and then polyacrylamide resin. Add perform in such a way that the paraffin content is from 0.2 to 0.9 wt.% with respect to the total solid content in wood subwindows, and the content of polyacrylamide resin is from 0.1 to 0.6 wt.% but relative to the total solids content in the wood fiber. All values of the ratio of paraffin and polyacrylamide resins but towards the wood fibers are taken based on the content of the solid is x substances. The rationale for this amount of additives above. The resulting suspension is left to drain on a wire grid, and the back surface of the wire mesh dehydrated by vacuum method with the formation of the Mat. In this molding sheets of wood fibers are arranged so that the longitudinal direction of the fibers is essentially horizontal, on the front face side, while on the rear side (side wire mesh) longitudinal fiber direction is substantially vertical due to the removal of moisture under vacuum. The imprint of the wire mesh will be transmitted to the back surface of the carpet and, thus, the back surface of the carpet is rough. Next, the resulting Mat is dewatered, if necessary, by cold pressing. After adding paraffin and polyacrylamide resin slurry may be stirred until the slurry onto the wire mesh.

The resulting carpet is subjected to hot pressing. Hot pressing is performed in three stages, which include pressing at a temperature of from 180 to 220°C and a pressure of 40 kg/cm2within 30 to 50 seconds, from 8 to 10 kg/cm2within 60 to 180 seconds, and from 20 to 35 kg/cm2within 60 to 90 seconds, in case of receiving fibreboard of a thickness of 2.5 mm During Dunaharaszti pressing pressure in the second stage, reduce, and, therefore, the water vapor contained in the carpet can easily be released, which prevents the occurrence of holes in the carpet. Press machine, used three-stage pressing, contains upper and lower molds. On the bottom surface of the mold, the gasket, put the wire mesh or perforated plate. Due to this, the floor, released during compaction of the carpet, removed from the baling machine.

After pressing the obtained fiberboard moisturize or regulate the humidity to bring the moisture content to the desired value, and the plate is dried for a specified period of time from receipt of product.

The following are examples of implementation of the present invention.

Wood grind, treated with steam and fibrillatory using a refiner to produce wood fiber. Wood subwindow was dispersible in water to obtain a suspension, the concentration of solids in which was approximately 2 wt.%, and pH was in the range of from 3 to 5. To the resulting suspension was added a cationic emulsion of paraffin and amphoteric polyacrylamide resin containing monomers with cationic groups and monomers with an anionic group in a molar ratio of 6:4, and the molecular weight of the resin ranged from 1 700000 to 2000000. The suspension was mixed in over their one minute, then left to drain on a wire grid, and the back surface of the wire mesh was subjected to dehydration using a vacuum with getting the carpet. Further added paraffin, so that the solids content of 0.4 wt.% with respect to the total solid content in wood fibers, and added polyacrylamide resin, so that the solid content was 0.1 wt.% but relative to the total solids content in wood fibers. The resulting carpet was subjected to three-stage pressing at a temperature of from 180 to 220°C., a pressure of 40 g/cm2within 40 seconds, from 8 to 10 kg/cm2within 60 to 180 seconds and 30 kg/cm2within 60 to 90 seconds. Then spent the humidity control with obtaining a wood-fiber plate according to Example 1.

According to Example 2 fiberboard manufactured analogously to Example 1, but in this case added 0.4 wt.% polyacrylamide resin relative to the total solids content in wood fibers.

According to Example 3 fiberboard manufactured analogously to Example 1, but in this case added to 0.6 wt.% polyacrylamide resin relative to the total solids content in wood fibers.

Wood waste wood or wood waste grind, is worked by steam and fibrillatory using a refiner to obtain wood fibers. Of wood fibres obtained by steam treatment and atrial wood and wood fibres obtained by steam treatment and atrial wood waste wood-fiber plates, added to the water in a mass ratio of 9:1. Wood fibers were dispersible in water to obtain a suspension, the concentration of solids in which was approximately 2 wt.%, and pH was in the range of from 3 to 5. In the rest of the fiberboard produced analogously to Example 1 to obtain a wood-fiber plate according to Example 4.

Wood grind, treated with steam and fibrillatory using a refiner to produce wood fiber. Wood fibers were dispersible in water to obtain a suspension, the concentration of solids in which was approximately 2 wt.%, and pH was in the range of from 3 to 5. The suspension is left to drain on a wire chop, and spent the dehydration of the rear surface of the wire mesh using a vacuum with getting the carpet. Further to the suspension was added polyacrylamide resin, paraffin or phenolic resin. In the rest of the fiberboard produced analogously to Example 1 to obtain a wood-fiber plate according to Comparative example 1.

Wood grind, treated with steam and fibrillatory using Rafi the EPA with getting wood fibers. Wood fibers were dispersible in water to obtain a suspension, the concentration of solids in which was approximately 2 wt.%, and pH was in the range of from 3 to 5. In the resulting suspension is added a cationic emulsion of paraffin and phenol resin. In the rest of the fiberboard produced analogously to Example 1 to obtain a wood-fiber plate according to Comparative example 2. Further added paraffin, so that the solids content of 0.4 wt.% with respect to the total solid content in wood fibers, and added phenolic resin, so that the solids content of 0.5 wt.% with respect to the total solid content in wood fibers.

According to Comparative example 3 fiberboard manufactured analogously to Example 1, but in this case added to 0.8 wt.% polyacrylamide resin relative to the total solids content in wood fibers.

The wood-fiber plates obtained in Examples 1-4 and Comparative examples 1-3 were measured thickness, density in the dry state, moisture content, bending strength and speed of water absorption. The results are shown in Table 1. Thickness, density in the dry state, moisture content, bending strength and speed of water absorption was measured in the compliance with industry standard of Japan And 5905-2003.

Table 1
ExampleExampleExampleExampleAgainst.Against.Against.
1234Ave 1Ave 2Ave 3
Thicknessmm2.332.322.292.322.262.352.36
The density in the dry state0.910.960.930.890.900.880.92
The moisture content%9.0 5.66.68.56.87.66.8
Bending strengthN/mm222.926.527.822.821.123.021.4
The water absorption rate%28.028.232.527.574.139.434.6

Bending strength and speed of water absorption in wood-fiber plates according to Examples 1-4 were superior to the corresponding characteristics of wood-fiber plates according to Comparative example 1, which contained only wood fibres, and were comparable with the corresponding characteristics of wood-fiber plates according to Comparative example 2, made with the addition of phenolic resin. According to Comparative example 3 wood-fiber plate, which was added to 0.8 wt.% polyacrylamide resin relative to the total content of t is erdich substances in wood fibers, showed the worst bending strength than wood-fiber plate according to Comparative example 2.

The above described implementations of the present invention, but the present invention is not limited to these options, and can be implemented in various ways without departing from the scope of the present. the invention described in paragraphs appended claims.

As described above, the present invention provides a successful receipt of a wood-fiber plate, as well as provides a method of its manufacture, with wood stove does not contain a phenolic resin, is easy to manufacture and has a Flexural strength and water resistance comparable with similar characteristics fiberboard made with the inclusion of phenolic resin.

1. Wood-fiber plate containing only wood fibers, polyacrylamide resin and paraffin, and polyacrylamide resin is afterno-ionic resin and contains monomer units with cationic groups and monomer units with anionic groups in a ratio of from 7:3 to 3:7, based on the molar ratio, and has a molecular weight of 800000 to 3000000, contents polyacrylamide resin from 0.1 to 0.6 wt.% with respect to the total solid content in wood fibers, the content is of paraffin from 0.2 to 0.9 wt.% with respect to the total solid content in wood fibers, and wood fibers are intertwined, and polyacrylamide resin and paraffin fill the gaps between the wood fibers.

2. Wood-fiber plate according to claim 1, characterized in that the wood fibers are fibers obtained by steam treatment and atrial wood and waste wood fiberboard from wood waste, and fiber content obtained by steam treatment and atrial waste wood fiberboard of wood waste is less than 10 wt.% with respect to the total solid content in wood-fiber plate.

3. A method of manufacturing a wood-fiber Board, comprising the following stages:
obtaining a slurry by dispersing wood fibers in water;
getting carpet by adding only paraffin and acrylamide resin in the obtained suspension and run-forming sheets; and hot pressing the obtained carpet and hydration or regulate the moisture content of the Mat, followed by drying; and at the stage of receipt of the suspension, the suspension is prepared with a concentration of solids from 2 to 3 wt.% and pH from 3 to 5, and at the stage of obtaining a carpet amphoteric polyacrylamide resin, which is afterno-ionic resin and contains monomer units with cationic groups and monomer units of anion the mi groups in a ratio of from 7:3 to 3:7 on the basis of the molar ratio, having a molecular weight of from 800000 to 3000000, add in a quantity from 0.1 to 0.6 wt.% with respect to the total solid content in wood fibers, and the wax is added in an amount of from 0.2 to 0.9 wt.% with respect to the total solid content in wood fibers.

4. A method of manufacturing a wood-fiber plate according to claim 3, characterized in that the wood fibers are fibers obtained by steam treatment and atrial wood and waste wood fiberboard from wood waste, and fiber content obtained by steam treatment and atrial waste wood fiberboard of wood waste is less than 10 wt.% with respect to the total solid content in wood-fiber plate.



 

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