TW200404657A - Method for making dimensionally stable composite products from lignocelluloses - Google Patents

Abstract

This invention relates to a process for making dimensionally stable reconstituted composite products from lignocellulosic material. By treating lignocellulose with high pressure steam to decompose and hydrolyse the hemicellulose, cellulose and lignin fractions of the lignocellulose and using those decomposition products as both a bonding and hulking agent, it converts, under heat and pressure in a moulding operation, the treated lignocellulose into moulded composite products such as panel boards and moulded articles. The composite products thus produced possess good physical and mechanical properties. Specifically, the dimensional stability in terms of the thickness swelling and linear expansion of panel boards such as fibreboards and particleboard can be minimized to very low levels when the panel boards are made in high density. The adhesive bond developed from thermosetting of the decomposition products of hemicellulose, cellulose and lignin is strong and stable, and resistant to boiling water and acid hydrolysis, and is free of formaldehyde emissions. Thus, the reconstituted panel boards and moulded products are suitable for exterior and particularly for indoor applications. The absence of free formaldehyde emissions makes the product very suitable for interior applications. The manufacturing cost for the reconstituted products is significantly lower in comparison to the conventional process because expensive synthetic resin is not used.

Description

200404657 V. Description of the invention (i) [Technical field to which the invention belongs] The present invention relates to a method for preparing a high dimensional stability composite product using lignocellulose without adding a synthetic resin. Tools and high-synthetic resins contain similar properties to the products made. [Previous technology] Taking warm M A S 0 N I Τ E hard boards as an example, wood-based wood-based panel tools have not improved significantly in the past 80 years. Various wood-based panel tools are basically mixed with synthetic resin after converting giant wood into fiber, concrete and wood chips, and then hot-pressed into products. There is no doubt that the physical properties and scope of use of such wood-based panels depend largely on the amount and nature of the synthetic resin that acts as a bonding agent. The first synthetic resins to be used should be called urinary and phenolic twists. Wooden composites with good urinary bond are generally used indoors, while relatively expensive aldehyde-formaldehyde resins are mostly used for wooden composites that are good for outdoor use. Improved skewing formula, improved raw material preparation method, added different additives to improve raw material properties, improved raw material orientation and improved hot pressing methods have been carried out, however, the use of synthetic resin from petrochemical industry as the twisting agent has always been the main Kink method. An obvious exception from conventional wood-based panel manufacturing tools is the MASONITE tool for the production of rigid thin fiberboard. This tool differs from the conventional thousand method tool in that lignin is used as a wood component and does not contain Synthetic resin. However, because the M A S 0 N I TE tool is a one-temperature method, a large amount of water is required to wash away water-soluble substances in various types of tree compacting materials that affect twisting. Therefore, this tool caused about 30% loss of raw materials, and this tool only allows the manufacture of products with a thickness of less than 6 mm and a texture. For these reasons, only a few domestically produced hard tempered boards should still be used. Is starting.

200404657 V. Description of the invention (2) The qualitative nature of the wood fiber, or in essence, the wood will absorb temperature and expand and shrink, and the size of the wood will change. Warmth is not good, especially for wood flooring. This type of product also affects this kind of deformation. One side requires more twisting on the conventional side. Some special applications obtained by the external pressing method of hot pressing are the above-mentioned, especially in its appearance, and the thickness of the entire product is much larger. Use a large amount of resin and heat-press hard and water resistant. However, one of the high thickness of composite products is that the wood is swollen. In turn, this original change is 4 daggers. However, the bulging and wrinkling method of the products caused by the compression and twisting of the zinc material can effectively increase the heat-pressed fiber modification. The dimensions are stable, and they are special products. In the high-density appearance, the swelling ratio is formed into a resin. Because of the use of the swelling ratio and is hydrophilic, because the wood directly and the wood ruler ', the stability of the fiber synthesis appearance, shrinkage and cracking improve the wood time, This kind of qualitatively reconstituted tree is one. The products are plastic-like. For example, the main disadvantage of this type of acetic acid tree is the high linear expansion. That is to say, the temperature of the water around the dry ring material in the tide will make the dimension unstable, and it will compound the dimensional board and oriented wood fiber, which will not only reduce the warping pattern. Quality composite products are an expensive measure to increase hot pressing. The combined products rarely have fat-impregnated low-high products and low-density surfaces, which are artistic, and show that the 30% ~ 60% weight of wood fiber is not only the density of fat-impregnated cattle, but their rate. In the warm environment, the changes in the wood material boards and composite products have increased their twisted and ring-shaped low-dimensional stability. In the stable environment of wood, the wood will be dislodged, resulting in the application of high-pressure strengthening of the corresponding wood size material. Dimensional stability, oil-removal, general commercial value, decorative layer products to wood fiber, a higher percentage of high-density products than low-density products, and leather paper J product density is a very strong synthetic product

Page 9 200404657 V. Description of the invention (3) The production cost is quite high, so the application is limited. A method for preparing a 7-mm thermosetting resin-impregnated paper high-pressure decorative layer woven board includes assembling 44 layers of synthetic resin-impregnated cardboard. Among these 44 layers of paper is a melamine-impregnated abrasion resistant layer, a melamine-impregnated decorative paper, 41 phenolic resin-impregnated kraft paper, and a sheet of melamine or phenolic resin. The bottom layer of the board is uniformly structured after hot pressing, and looks like plastic. However, the resulting products have the disadvantage of low dimensional stability under varying temperature conditions, especially in the width direction of the woven board, mainly because the fibers in the kraft paper have been oriented. U.S. Patent No. 4 5 0 3 1 1 5 discloses an improved method for preparing high-density composite products, that is, hot pressing of wood fiber raw materials containing 15 to 40% by weight of thermosetting synthetic resin to 9 0 0 to 1 Density of 600 kg / m3. Because wood fibers are cheaper than kraft paper, this method reduces the cost of high-density composite products, and because fiber-oriented kraft paper is not used, the linear expansion rate of products produced by this method is also reduced. However, due to the use of expensive synthetic resins, the production cost of this product is high, which limits its use. Laminated wood flooring has particularly high requirements for dimensional stability of the product, especially the linear expansion rate. Laminated wood flooring is usually made by two methods. One is the more economical direct lamination tool (DPL) recently introduced. It heat-molds the abrasion-resistant layer, the core board made of melamine-impregnated decorative paper, fiberboard or particleboard, and the balanced bottom layer impregnated with melamine or acetic acid resin. The flooring is inexpensive and very popular in the market. Another method is the above mentioned thermosetting resin impregnated paper high-pressure decorative layer woven board (HPL). In this tool, wear-resistant paper, melamine-impregnated decorative paper, and several layers Phenolic resin impregnation

200404657

The kraft paper was used after tissue with a density of about 140 kg / m3. The long time and relatively high temperature pressed to the resulting south lamination bond like texture. The balance floor is also similar to .Made = sanded so that the kraft paper with the core board is put into the melamine 'second server, that is, several sheets of phenolic resin should be dipped in the bottom board, and the paper should be sanded on the side with resin to impregnate. The reinforced slave board is made from lifting :: 2 2 patterned 'in this way. , 6 ~ U mm thick) ;; :: using laminated woven board as the top plate (degrees in the range of 800 ~ 900 kg) ^ dimensional plate or flower making ^ reverse core plate " 〇 · 8 mm thick ). Card 3), the balance base plate is used as the backing plate (-Generally, the general servant thinks that the strong denier board obtained by weaving the high-pressure decorative layer, the HPL tool has a mass better than that obtained by the direct lamination tool (〇pL) Reinforced woody berry should be used, however, because of its high cost, high-pressure decorative layer woven board ^ HP \) is not as popular as direct laminated board. According to a European consumer report, the best hard fiberboard has a thickness expansion rate of 7%. U.S. patents 5 0 7 3 1 9 and European patents 0 4 9 2 0 1 6 and 0 0 1 6 1 7 6 6 Cana ^ = Li 1 3 3 8 3 2 1 Adding synthetic handles and composite products and thermosetting stranding agents, the tool involves the use of high-pressure steam to degrade and hydrolyze about 20% to 30% of the whole lignocellulosic material, and the fiber becomes a low-molecular-weight water-soluble And the use of these water-soluble substances in situ with cellulose and lignin in the hot pressing process to produce a recombinant composite material 'Since the cellulose is the most hydrophilic component of wood, it has the greatest impact on the dimensional change of wood, Therefore, its degradation and transformation cause the hydrophilicity of the recombinant composite material to decrease, and the dimensional stability to be improved. In addition, the above patents also

Page 11 2UU4U4657 V. Description of the invention (5) Shows multiple times of preparation and recombination In addition, under the condition of fine hot pressing of the fiber, the water-soluble twisted filling made by recombination or recombination of wood is excluded, as mentioned in Lignocellulosic A degraded and made 45% cellulose in water-fiber materials, the properties remained unchanged, and the sexual substance was used as the composite product of the twisted group. This method is used to increase the bulking agent for the stranding agent. ^ Break and major improvements [Content of the invention] Now we degrade the parent material at high W, it is believed that in the high, melting and flow is the use of complex, 2 :: special change part of the cellulose Feasibility of becoming a water-soluble stranded material and a bonded material. Ho 枓 it 素 f element: the meaning of the low molecular weight water-soluble substance obtained by stripping: 、, and weaving, etc. stay in the gap as a filling material :: 1 Some water-soluble substances polymerize heat-set, become water-insoluble, less In order to absorb water, this filling effect is also; = inch stability, • This, from the cellulose :: shellfish, in the hot-pressed composite products, twisted and returned the product's mechanical strength and dimensional stability. Filling: The lignin in the material f accounts for 20 to 25 中 / ❶, although it is still water-insoluble, and remains in the hydrolyzed wood II as another filler. It accounts for 40% of the lignocellulose, and it will not be degraded in the first steam treatment, because it can be used as the skeleton material of recombined composite products. Dagger = agent, in situ twisted fiber and lignin soluble in hot pressing :, the new idea of the health equipment is to use the cellulose to degrade the second = strong: to obtain the physical properties of the product, do not use synthetic resin for: rail * gauge tools When producing composite lignocellulosic products— ^ ::, low molecular weight lignin and clever density composite products wrapped outside the fiber, can be used as a stranding factor: under low pressure, low molecular lignin and lignin decomposition products will be Plastic \. See also soluble substances derived from the degradation of this cellulose

Page 12 200404657 V. Description of the invention (6) The stranding method is formed together, which further strengthens the physical properties of the product. In addition, the compaction caused by high pressure, together with the filling effect of the degraded cellulose, eliminates the voids in the wood fiber material and further enhances the water resistance of the product. Another possibility is that the degraded lignin has undergone a self-condensation process. In this process, the functional fluorene on the degraded lignin branch chain, the initiation group on the benzene ring and the activated carbon atom on the aromatic ring should react together to form a strand. The composite material ruler tube thus obtained has no added synthetic resin and still has excellent texture, especially its dimensional stability is superior to high-density products with high content of synthetic resin pressed by conventional methods. From an economic point of view, The production cost of high-density composite products without synthetic resin is 50 to 60% lower than the conventional method. If the production raw materials are made of non-wood residues, the production costs will be further reduced. The present invention provides a method for preparing a dimensionally stable composite product from lignocellulose. It should include: a. Treat the lignocellulosic material with high pressure steam at a temperature high enough to decompose and hydrolyze the cellulose and lignin without carbonizing the lignocellulosic material. b. Keep lignocellulose under high pressure steam for a sufficient time to decompose and hydrolyze the cellulose and lignin into low molecular weight water-soluble stranded raw materials without degrading cellulose. These stranded raw materials include five-carbon and six-carbon sugars, Sugar polymers, furoic acid products, dehydrated carbohydrates, organic acids and low molecular weight lignin, and other lignin decomposition products. C. Dry hydrolyzed lignocellulose. d. Forming fiber or scrap-like wood fiber materials in groups.

Page 13 200404657 V. Description of the invention (7) e. The above slab is hot-pressed to polymerize, cross-link and heat-set the above-mentioned water-soluble stranded raw material for a time sufficient to twist the slab in situ to form a solid recombined composite product. The hydrolyzed lignocellulosic material obtained by the present invention can be broken into fibers or shredded materials (for example, before or after drying), or can be prepared by blasting according to steps a) and b). The present invention also provides a method for preparing a dimensionally stable composite product from lignocellulose. It should include: a. Treat the lignocellulosic material with high pressure steam at a temperature high enough to decompose and hydrolyze the cellulose and lignin without carbonizing the lignocellulosic material. b. Keep lignocellulose under high pressure steam for a sufficient time to decompose and hydrolyze the cellulose and lignin into low molecular weight water-soluble stranded raw materials without degrading cellulose. These stranded raw materials include five-carbon and six-carbon sugars, Sugar polymers, furoic acid products, dehydrated carbohydrates, organic acids and low molecular weight lignin, and other lignin decomposition products. c. Dry the hydrolyzed lignocellulose. d. Embed the remaining fibers and crushed lignocellulosic materials with a low-molecular-weight, water-soluble stranded material. These low-molecular-weight, water-soluble stranded substances include five- and six-carbon sugars, sugar polymers, furfural products, dehydrated carbohydrates, and substances decomposed or hydrolyzed by one or more of the present celluloses and celluloses; Adjust before thermosetting in step e). In the preferred process of the present invention, the water-soluble stranded raw material in steps d) and e) is at least partly the water-soluble stranded raw material in step b), and the slab center includes a low-temperature formed by step b). Molecular weight lignin and other lignin degradation products.

200404657 The inventor also includes the following in the first aspect of the present invention: i. Techniques hydrolyzed from the cellulose, separated by vitamins, separated by evaporation, and raw materials and sexes suitable for use as thermosetting waterproof splicing agents. . Knife's hygroscopic conjugate is negatively converted to ii. The separated and hydrolyzed woody steam is treated until most of the cellulose: salty, quasi, raw materials. Once again by Nanbao treatment sugar, sugar polymer, furfural, de + and / Knife solution becomes five carbon and six carbon decomposition materials. Anaerobic compounds, organic acids, and other components must be made of cellulose water '::: vitamin material' thai residue residue wood "solution, as well as residual low-molecular-weight lignin and other components, ^ is helpful for twisting .- Zili lignin degradation product constitutes the slab — previously hydrolyzed: raw ::: 1 :: added before, the use of water = = water-soluble ^ products of the cellulose filling medium tools. A: i use Lignocellulose is prepared as a size-resolved element. Cellulose and lignin are combined to decompose lignocellulose: the lignocellulosic material produced is processed in the senior year of the second year, and the process is 200404657. V. Description of the invention (9) is converted into sheet and molded. Products, and the composite products thus obtained have good physical properties and mechanical properties. In particular, the dimensional stability indicators such as the thickness expansion rate of the high-density fiberboard and particleboard made by this tool can be reduced to very low levels. The thermosetting kink of the cellulose, cellulose and lignin decomposition products caused by the tool has high strength and stability, can withstand boiling water and acid decomposition, and has no formaldehyde contamination. Therefore, the plate-type molded product obtained by the tool is suitable for For outdoor use Since no expensive synthetic resin is used and no formaldehyde is released, the reconstituted wood product made by the tool is also very suitable for indoor use, and its production cost is significantly lower than the production cost of conventional tools. Other objects, features, and advantages can be more clearly understood, and several preferred embodiments are described below in conjunction with the accompanying drawings to explain in detail as follows. [Embodiment] [First Embodiment] This example describes the use of The process of high-pressure steam hydrolysis of wood fibers and the method of hot compaction of hydrolyzed lignocellulosic products. An equal amount of clean and freshly prepared cedar and hard maple shavings with a moisture content of about 22% are loosely packed into a compact In the container, after the container is closed, 447 pounds per inch 2 (240 ° C) of steam is introduced. After holding the pressure for 90 seconds, the container discharge valve is quickly opened to allow the raw materials to burst out. After processing, The raw material of wood fiber is collected in a bag by a cyclone separator. This pair of hydrolyzed flake shavings has become loose fibers and fine scraps. Its color is dark brown and the moisture content is relatively high. Soluble pigment hydrolysis twisted mass containing from 18% sugar, which is the value of P Η 3.7, similarly, also the lignin is decomposed into low molecular weight compounds, but

Page 16 200404657 V. Description of the invention (10) > It is water-insoluble 'and is covered on the surface of fibers and scraps. The hydrolyzed lignocellulose and the material are dried to a moisture content of 3%, and the dried raw materials are grouped into rings of predetermined size and weight, and then hot-pressed into a 8 mm thick uniform structure plate with a hot-pressing temperature of 20 (TC The hot pressing time is 20 minutes, including 5 minutes of cooling time. According to different density requirements, the pressure can be changed from 300 to 1050 lbs / inch2. In this example, a total of made and tested 5 kinds of boards with different densities and sizes of 40 Ox 40 Ox 8 mm. The mechanical and physical properties of the boards are tested according to the American standard ASTM-1 3 0 7. The temperature strength of the boards after 2 hours boiling in boiling water is according to the Canadian standard CAN0. 188. OM78, which is a national standard test for outdoor-grade wood products, the formaldehyde emission of these boards is tested according to the gas analysis method (PN-D- 9 7 0 1 3 1-1 9 9 9), and the result is 0.1 mg / M2 Small mouth inch 0 As a result, these boards can be classified as E 0 day, E 0 is the strictest formaldehyde release standard in Europe, which means n F-zero π or non-formaldehyde release. Test results column Table 1. In addition, Figure 1 clearly shows that the twist strength in high-density boards The increase in degree shows a natural index increase. The color of the board is dark brown, and the knot is like plastic, which is very similar to the commercial thermosetting resin impregnated paper high-pressure decorative layer woven board. It is believed that lignin is in the wood fiber material A natural depleting agent, lignin is a kind of natural coriander. Therefore, when low-molecular-weight lignin and decomposed lignin are cured under high temperature and pressure, it is completely possible to produce a phenol-formaldehyde twisting method.

200404657 V. Description of the invention (11) Linear expansion (%) inch οα CD οα CD BUτ— < 〇) BUτ ~ Η CD CO r 1 H CD Thickness expansion rate (%) in 24-hour cold water immersion | eo LO τ— Η CO CDCD 〇〇 卜 οα CD τ 'i V Internal twist strength (ΙΟΟχχ Pa) 0, 35 oo CO CO τ—i CO 1 i (XI CD 〇〇oa province_ α $ 1400 3050 4930 7120 9540 static Flexural strength (ΙΟΟΟχ Pa) Wet cook for 2 hours ο α CO CO (> ay—H v v H oa CO CXI CO CO inch inch LO CO r—1 corner CO CXI CO LO inch oa CD CO 82. 6 CD CO corner CD oa en 1060 1210 1380 Board number PO ◦ Q ω

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Page 19, 200404657 V. Description of the invention (13) The clean and fresh maple wood with a moisture content of about 57 ° / ◦ is treated with high pressure steam at 198 ° C for about 8 minutes, and the processed maple is fed into The refiner was thermally ground into fibers under a steam pressure of 6 bar, and the obtained fibers were dried by hot air to a moisture content of 3 to 5%, and then the dry fibers were composed into a slab of 40 Ox 4 0 mm. The hot-pressed plate obtained by wind decomposition method 8 has a hot-pressed temperature range of 180 ° C to 220 ° C and a hot-pressed time range of 2 to 4 minutes. The nominal thickness of the plate is 8 mm. The density is 1050 kg / m3. The test results of the board are listed in Table 2. The data shows that the hot pressing temperature and hot pressing time do not significantly affect the mechanical properties of the board, but the dimensional stability of the board, that is, the thickness expansion rate and linearity The expansion rate obviously decreases with the increase of the hot pressing temperature and the prolonging of the hot pressing time.

Page 20 200404657 V. Description of the invention (14) Linear swelling and swelling (¾) · CT) τ-Η CZ? CO λ i CD rH cz? Ττ— (o rr—t cz > CO -T ~ (CD LO r—H CD inch τ—t CZ > Thickness expansion ratio (%) for 2 hours boiling water cooking cz > CN1 CO CO y—i CNI LTD r—t CD y—i LO CO r— ^ CXI < 3 > τ · ^ OO CD r ί CNI 24-hour cold water immersion thickness expansion rate (%) CO inch Bu LO 〇0 cz > oo oo CO LO LO c > a inch Bu 03 «X. S -Ξ-Bu τ—Η CTD τ— t CJ ^ T— ^ T CNI inch CNI CO CNI CO (XI 卜 ο * * ^ ^ S ^ 漶 C ^ 54 6 0 5 840 5 5 7 0 6 0 2 0 6 3 3 0 6 4 8 0 6 3 5 0 6 3 2 0 &" ^ Ο 溆 c " ~ e〇〇〇CNI 03 LO CO oo inch CO CO .LO CO inch Ln OO inch LO CO inch LO CXI LO LO density (kg / m3) 1030 1050 1040 I 1070 1060 1070 1050 1070 ΜΗ ^ Φ Csl CNI inch CNI inch oa Lai GuangS _super p 160 160 180 180 200 200 220 220 220 Picture · 200404657 V. Description of the invention (15) [Third embodiment] This example shows the present The invention is used for the preparation of partial solidification, the real activity of this solid board, which The thickness of the material ranges from 6 to 12 mm, and the density is from 550 to 900 kg / m3, which can be used for further processing into solid high-density composite boards. The pre-made board can be economically and effectively used in continuous presses On the production, this material is solid and easy to be processed by the follow-up tools into the final product, convenient to transport, easy to package and store, which is in sharp contrast to the soft and brittle slabs produced by conventional tools. The weaving ratio of the mixture is 6 5 : 3 5 beech and pine wood chips are continuously added to a medium-density cooker, the mixed wood chips are cooked under a steam pressure of 12 bar for about 10 minutes, and then continuously squeezed through a hot mill that passes through the reverse rotation To make the wood chips into fibers and fibers. Use a tubular open flame dryer to dry the obtained fibers to a moisture content of 5%, transport the dried fibers to a continuous fiber slab with a pressure mechanism, and remove excess air by pre-pressing. A continuous press at a temperature of 180 ° C presses the dry board into a thickness and density ranging from 50 to 900 kg / m3. The compaction of the pre-made board is due to the steam-treated wood chips. Water-soluble decomposition of the cellulose These pre-made boards can be made in various sizes for secondary processing into the final product and can also be packed for shipment or storage. [Fourth Embodiment] This example shows a tool for pressing a preformed sheet into a high-density composite sheet. In this example, a medium-density sheet with a solid thickness of 10 mm and a density of 700 kg / m3 and a moisture content of less than 2% is subjected to secondary processing and hot-pressed into a high-density fiberboard. Two pre-made sheets The MDF was loaded into a single laminator.

Page 22, 200404657 V. Description of the invention (16) Hot pressing at a temperature of 1 100 psi at a temperature of 16 5 ° C for 25 minutes, and then reducing the hot pressing temperature to 7 within 3 minutes At 0 ° C, at the same time, the pressure is turned on at the same time. The average density of the obtained 10 mm fiberboard is 1370 kg / m2, and its static bending strength is 87.5 kPa, and the elastic cross-section is 9 7 40 kPa. Twisting strength is greater than 3.5 kPa, thickness expansion rate is 1 ~ 2% in 2 hours cold water soaking, thickness expansion rate is 4 ~ 6% in 2 hours boiling water boiling, linear expansion rate is 0.17% in length direction, linear in width direction The expansion rate is 0.16%. [Fifth embodiment] This example shows a method for commercial manufacturing equipment to make a prefabricated medium density into a high-density reinforced wooden floor. According to the following method, the following blanks contain pre-made 6 mm thick plates with a density of 680 kg / m3: 1) A piece of melamine-impregnated abrasion-resistant paper 2) A piece of melamine-impregnated decorative paper 3) Two pre-made medium-density 4) A piece of melamine-impregnated balance paper Place the assembled slab between two stainless steel pads for induction and hot pressing. The hot pressing tools are as in Example 4, but to increase the size of the product Stability, the hot pressing time is increased to 3 5 minutes, and the plate cooled after the hot pressing is cut into a size of 1 9 5x 1 3 0 5 mm, which can be used as laminate flooring after closing the joints, 5. 9 mm thick The density of the strengthened wood floor board is 1410 kg / m3, the static bending strength (M0R) is 10 2 kPa, the elastic cross-section is 1 2 4 7 0 kPa, the inner twist strength is greater than 3.5 kPa, and the surface strength is greater than 3.5 kPa, 24 hours cold water immersion thickness expansion ratio (in the center) 0.0%, edge expansion ratio 2.8%, lengthwise linear expansion ratio 0.15%, widthwise linear expansion ratio 0.1 4%, currently the best player on the market

200404657 V. Description of the invention (17) The thickness expansion rate of the wood flooring board for 24 hours after soaking in cold water is 7 · 〇 〇 / 〇. [Sixth embodiment] This example shows a method for preparing a super-strengthened wooden floor, which can ensure that the thickness expansion coefficient of the board in the cold water immersion for 24 hours is 0. 0/0. Raw material preparation and production of pre-manufactured medium-density board tools are shown in Figure 2. However, the medium-density board thickness in the proportion is 12 mm and the density is 800 kg / m3. To make medium-density board: 1) A sheet of melamine-impregnated abrasion-resistant paper 2) —A sheet of melamine-impregnated decorative paper 3) —A medium-density sheet of Zhang Yu-made 4) A sheet of melamine-impregnated backing paper will have a wood grain The stainless steel backing plate is placed on top of the assembled slab, a smooth backing plate is placed under the platen, and it is placed in a single laminator at 200 lbs / US $ 2 or 800 Newtons / cm2. Pressure and temperature at 16 5 ° C for 20 minutes' and then reduced to 65 ° C within 3 minutes while decompression and shut down. After cooling, the solidified board has a thickness of 6.9 mm and a density of 14 10 kg / m3. It has been cut to 195 x 1 3.0 mm and can be used as a reinforced wood floor after closing the grooves. The mechanical and physical properties of the 6 · 9 halo laminate flooring are tested in accordance with European standards EN 13329, German standards DIN EN311, 319,310, DIN EN438- 2 · 1 8 and International Standards Organization 丨 s〇2 8 丨 3. The results are listed in table 3.

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200404657 V. Description of the invention (18) Test item standard unit result thickness < EN13329 mm 6.9 Surface leveling 1 fferkstandard PV054 level 5 hardness ^ erkstandard PY054 level 1 Smoke proof DIN EN438-2. 1 8 level 5 punching strength (small ball ) ENE 133229 Newton 12 punching strength (large ball) ENE 133229 mm 1900 abrasion resistance ENE 133229 40 0 0 edge expansion ENS 133229 ° / 〇1.89 edge expansion after drying ENS 133229% 0.06 linear expansion in length ΕN 133229 ° / 〇 0.15 Linear expansion in width direction Ν 133229 ° / 〇0. 14 Linear contraction in length direction Ν 133229% -0.04 Linear contraction in width direction 133 229% -0. 06 Surface strength DIN ΕΝ311 Newton / 亳 2 2 > 4 Internal twist strength DIN ΕΝ311 Newton / square meter 2 > 4 Static bending strength DIN ΕΝ311 Newton / square meter 2 91. 35 Elastic cross section DIN EN311 Newton / mm 2 1 2000 degrees (60 °) ISO 2813 19. 8 Table III

200404657 V. Description of the invention (19) [Seventh embodiment] This example shows the advantages of the low-density fiberboard (LDF) prepared according to the present invention in the production of three-dimensional door skins by using the y-knife technique. ^ The low-density dimensional sheet was prepared as a fiberboard according to Example 3, and its density was 50 kg / m3, with a thickness of 6.3 mm. The moisture content was 2 to 3%, and low ^ = f dimensional sheet. After the 14 fibers are packaged, they are sent to the door skin for hot-pressing. Structured door skin. These solid pre-made boards are sprinkled with water on both sides at a ratio of 30 grams of water / ^^ +, and then the pre-made boards are directly injected into the mold = a hard door skin is made in depletion and heat-setting. The molding temperature was i 8 5. 〇, I, the force is 500 pounds per US inch 2 that is 5 4 · 5 kg / cm2, the hot pressing time is 7 5 to suppress the door skin thickness 3 2 ¾ meters density 1 104 kg / m2, static curvature The strength is the width of the person's elasticity of 65,000 kPa, the internal twist strength is 1 · 58 kPa, and the thickness is less than 3 inches ~ the water immersion thickness expansion rate is 1 4 · 3%. The surface of the door skin is smooth and flat. The profile or uneven depth section did not show any stress deformation, etc., old = knot, which indicates that the good molding of the preformed plate under high temperature and high pressure = hunger, which is due to the low decomposition of lignin in the preformed Density, improves, and promotes the cyst formation of pre-made plates. I. Eighth embodiment of the lintel plate] This example shows an example of borrowing high-poor materials from agricultural residues such as chaff and bagasse. Mix husks with a moisture content of 8 to 9% and moisture content to ~ ⑴ 'Slab slag is mixed in equal amounts based on the dry weight of the foam, then use 475 lbs / inch 2, bite 0% of 2 4 ° C Steam treatment for 1 minute. The treated mixture was quickly ranked I to produce a blasting effect. The lignocellulosic material was transformed into a powdery powder. The dry powdery residue was reduced to a moisture content of 2%, and the composition was made into a 400 'crushed material. »400 Mm

Page 26, 200404657 V. Description of the invention (20) ----- The board is hot-pressed to a thickness of 8 mm and a density of 1460 kg / meter. The hot-pressing cycle is 120 pi / US At 2 or 83 kg / cent ^ 2, the temperature is 16 centimeters, and the time is 25 minutes, including 5 minutes of cooling time. The properties of the resulting product are as follows:

Ts: f degree 52, Pa, elastic cross section 6 300 kPa, internal weave strength 丄, ΐ is greater than 404 Newtons, thickness expansion is less than, at :: solid square = line, respectively, 018% and 019%, This shows that the linearity and the linear expansion of the zirconium are added by 1. = ° when using the grain twisted pieces: two ^ first measure the size of the board dried in 2 hours, the size of the bubble. Inch retest board immersed in cold water for 24 hours [Ninth Example] This example shows the use of wood keyholes u, 丨, 丨 丄 twisted material to prepare recombinant wood: composite ::: cellulose into water-soluble The third embodiment will be mixed. After the steam treatment, hot water was extracted and steamed with 2 bar of pine wood chips. .8% by weight of dilute sulfur = mouth raw material. The acid-treated wood chips were then re-treated with 15 = t f the & wood chips. Sulfur cellulose is converted into water-soluble twisted steam, and it takes 12 minutes to change most of the steam release valve. After the blasting process is completed, the water-soluble twisted raw material is released suddenly; the raw material contains lignin. Decomposition = Luoye added the hydrolyzed raw material to dry it, and the water content of the caustic soda solution was < ^ ~ ς. / D solution, P Η value to 3 · 5, dry de 1 ^ ', can be used to prepare recombinant wood composite products ;: water 200404657 V. Description of the invention (21) material. According to Example 6, a 6.9 mm thick reinforced wood flooring board was prepared from the above raw materials, and its physical properties are similar to those of a reinforced wood flooring board made of beech and pine chips treated with only one steam treatment; The thickness expansion rate of the former for 24 hours of cold water immersion is 13%, while the former is 1.9%, which indicates that the use of hydrolyzed cellulose and high content of lignin decomposition board to improve the dimensional stability of laminate flooring. The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of implementation of this creation; that is, all equivalent changes and modifications made in accordance with the scope of the patent application for this creation are covered by the scope of this creation patent .

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Claims (1)

200404657 6. Scope of patent application 1. A method for preparing a dimensionally stable composite product using lignocellulose, comprising: a) treating lignocellulosic material with high pressure steam, and the steam temperature is high enough to hydrolyze and decompose hemicellulose and lignin Without carbonizing lignocellulose; b) Keeping lignocellulosic materials under Nanjou's time is enough to hydrolyze and decompose hemicellulose and lignin into low-molecular-weight water-soluble stranded raw materials, containing five and six carbon sugars, sugar polymers, furfural, and dehydrated carbohydrates , Organic acids, and low-molecular-weight lignin and lignin decomposition products, but cellulose has not been hydrolyzed; c) drying the hydrolyzed lignocellulosic material; d) drying the wood in a fine-grained or fiber state after drying Fibrous material, containing low-molecular-weight lignin and lignin degradation products from step b), and water-soluble compounds derived from hemicellulose and cellulose hydrolyzed one or more times, including five-carbon and six-carbon sugars, sugars Polymers, furoic acid, dehydrated carbohydrates, organic acids, etc., together to form a board fan; and e) The slab is hot-pressed to a sufficient temperature, pressure and time, so that the water-soluble stranded material and low molecular weight lignin and lignin decomposition products can be polymerized, cross-linked and cured. Into a solid recombinant complex product. 2. The method for preparing a dimensionally stable composite product using lignocellulose as described in the scope of claim 1, wherein at least a part of the water-soluble stranded substance is water-soluble produced in step b) at steps d) and e). Stranded substance. 3. Use lignocellulose to prepare dimensional stability as described in the scope of patent application 1. Page 30, 200404657 6. A method for applying a patent to a composite product, wherein the steps after step b) and before step c) include: i) separating the water-soluble stranded material obtained by hydrolyzing hemicellulose from lignocellulose, It is evaporated and concentrated to make a thermoset waterproof splicing agent; ii) the residual lignocellulosic material previously hydrolyzed and separated from the water-soluble strand is hydrolyzed and decomposed into a low molecular weight by a high-pressure steam treatment; Water-soluble stranded substances containing five and six carbon sugars, furfural, sugar polymers, furfural, dehydrated carbohydrates, organic acids, and other hydrolyzed and degraded substances; and iii) wood fibers that have been hydrolyzed twice upon drying The lignocellulosic material is mainly composed of a water-soluble stranded substance hydrolyzed from cellulose, decomposed of low-molecular-weight lignin and other hydrolysates, and residual fibers, wherein the water-soluble stranded materials in steps d) and e) The composite material is prepared in step ii), and the low molecular weight lignin and other lignin degradation products formed in step b) are also part of the slab. Stranding helps. 4. A method for preparing a dimensionally stable composite product using lignocellulose as described in claims 1 to 3 of the scope of the patent application, wherein in steps a) and b) is used to hydrolyze hemicellulose, lignin and cellulose The steam temperature is between 120 ° C and 180 ° C. 5. The method for preparing a dimensionally stable composite product using lignocellulose as described in claims 1 to 3 of the scope of the patent application, wherein in step e) hot pressing is used to cure the water-soluble strand to form a strand at a temperature required for stranding. 1 2 0 ~ 2 5 0 ° C. 200404657 6. Application for patent scope 6. The method for preparing dimensionally stable composite products using lignocellulose as described in item 1 of the scope of patent application, wherein the temperature and pressure required for the molding in step d) only make water-soluble strands at high speed The material is pre-cured in the slab, a fairly solid pre-film or sheet is made, and then the composite composite product is hot-pressed again in step e). 7. The method for preparing a dimensionally stable composite product using lignocellulose as described in item 6 of the scope of the patent application, wherein the hot pressing temperature required to produce the preform or plate is 1 2 0 ~ 2 50 ° C, and the The density of the prepared pre-film or board is below 140 kg / m3. 8. The method for preparing a dimensionally stable composite product using lignocellulose as described in item 6 of the scope of the patent application, wherein the method e) for preparing a dimensionally stable composite product from lignocellulosic material, wherein step e) includes: e 1) The temperature of the press is above 120 ° C in a preform or plate placed on the hot press; e 2) The high pressure of the lock-up press is maintained for a sufficient time to achieve the required density while the water-soluble stranded substance is thermally cured to form the strand; e 3) Relieve pressure; and e 4) Open the press to extract the compression-molded sheet, which is a solid recombination compound. 9. The method for preparing a dimensionally stable composite product using lignocellulose as described in item 8 of the scope of patent application, wherein after step e 2) and step e 3), the temperature of the press is reduced to below 90 ° C before pressure relief. . 10. The method for preparing a dimensionally stable composite product using lignocellulose as described in item 8 of the scope of the patent application, preparing a dimensionally stable composite material from lignocellulose 200404657 6. The method of applying the composite products with the scope of the patent application, wherein the density of the composite products is below kg / m 3 1 500. 1 1. The method for preparing a dimensionally stable composite product using lignocellulose as described in claims 6 to 10 of the scope of the patent application, wherein a plurality of pre-forms or boards are laminated, and step e) is hot-pressed to Preparation of recombinant complexes. 12. The method for preparing a dimensionally stable composite product using lignocellulose as described in claims 6 to 10 of the scope of the patent application, wherein a plurality of methods from the claims 6 to 10 of the scope of the patent application are laminated The produced pre-template or sheet is simultaneously coated with a strong melamine resin impregnated paper on the upper and lower surfaces of the laminated sheet, and then further pressed in step e) to produce a recombined composite. .1 3. The method for preparing a dimensionally stable composite product using lignocellulose as described in item 1 of the scope of the patent application, wherein the prepared recombinant composite can fully reach the European wood composite standard EO aldehyde release standard, that is, 0% bleed or without formaldehyde. 1 4. A method for preparing a dimensionally stable composite product from lignocellulose, comprising: a) treating the lignocellulosic material with high pressure steam, and the steam temperature is high enough to hydrolyze and decompose hemicellulose and lignin without lignocellulosic material Carbonization, b) keeping lignocellulosic material under high pressure steam for a sufficient time to decompose and hydrolyze hemicellulose and lignin into a low molecular weight water-soluble stranded substance containing five and six carbon sugars, sugar polymers, furfural, dehydrated carbon Compounds, organic acids, and low molecular weight lignin and lignin hydrolysates, but cellulose is not broken down; 200404657 6. Application scope c) Dry hydrolyzed lignocellulosic raw materials; d) Dry lignocellulosic materials with fine particles or fibrous material after drying, containing low molecular weight lignin and lignin decomposition products from step b) Form embryos together with water-soluble stranded substances derived from one or more times of hemicellulose and cellulose hydrolysis, including five-block and six-carbon sugars, sugar polymers, bran rattan, dehydrated carbon compounds, and organic acids. ;and e) Hot pressing the formed slab at a sufficiently high temperature and pressure for a sufficient time to at least cause the water-soluble stranded material to polymerize, crosslink and heat-cured in situ to achieve stranding to prepare a recombinant composite. The low-molecular-weight lignin and the lignin decomposition product did not form a strand, but after being hot-pressed again, given sufficient temperature, pressure and time, polymerization, cross-linking and thermosetting were still possible to prepare the recombinant complex. Page 34