Preparation method of a bending-resistant laminated veneer lumber and preparation method of a modified bending-resistant laminated veneer lumber

Abstract

The application discloses a preparation method of a bending-resistant single-plate laminated material and a preparation method of a modified bending-resistant single-plate laminated material, and the preparation method of the bending-resistant single-plate laminated material comprises the following steps: (1) preparation of poplar single-plate; (2) modification of the poplar single-plate; (3) preparation of the poplar single-plate laminated material; (4) modification of rattan; (5) hardening of the rattan; and (6) combination of the poplar single-plate laminated material and the hardened rattan. In the hardening process of the green rattan, the recombination method and the weaving method are used, the static bending strength, the elastic modulus, the tensile strength and the impact strength of the green rattan are increased, and the green rattan can greatly improve the bending resistance when the green rattan is used as the filler of the poplar single-plate laminated material.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laminated veneer lumber, in particular to a preparation method of a bending-resistant laminated veneer lumber and a preparation method of a modified bending-resistant laminated veneer lumber. BACKGROUND

[0002] Poplar is recognized as an environmentally friendly material in the world, and has the advantages of easy planting, fast growth, short renewal period, etc. At the same time, the poplar veneer lumber is tough, has high mechanical strength, strong corrosion resistance, moderate hardness and strength, and is suitable for carving. It has the advantages of light weight, high strength, good elasticity, long fiber and easy processing, etc., so it is widely used in the fields of building, decoration, furniture, etc. However, due to the characteristics of poplar that it is prone to warping, cracking and severe shrinkage, the dimensional stability of the product is affected, and the unbalanced moisture content leads to large warping deformation of the product, especially during hot pressing, the poplar veneer lumber will appear bending deformation due to the arrangement of the grain.

[0003] Rattan is a natural, renewable, biodegradable and recyclable environmentally friendly material, which has the characteristics of high strength, high toughness, easy processing and easy bending deformation. At the same time, rattan has straight and smooth texture. Because of the strong flexibility of rattan, it can be used as various woven materials, and the woven materials have strong mechanical properties and good dimensional stability. Therefore, how to use rattan to improve the warping deformation of poplar veneer lumber has become one of the research directions. SUMMARY

[0004] The main purpose of the present application is to provide a preparation method of a bending-resistant laminated veneer lumber and a preparation method of a modified bending-resistant laminated veneer lumber using rattan to improve the poplar veneer lumber.

[0005] To achieve the above-mentioned purpose, the present application provides a preparation method of a bending-resistant laminated veneer lumber, comprising the following steps:

[0006] (1) Preparation of poplar veneer

[0007] The poplar logs are immersed in a sodium silicate solution for impregnation treatment, and after drying treatment, the poplar veneer is cut out. Then the poplar veneer is dried and placed in a constant temperature and humidity box to adjust to the equilibrium moisture content.

[0008] (2) Modification of poplar veneer

[0009] The poplar veneer adjusted to the equilibrium moisture content is immersed in vegetable oil for impregnation treatment to obtain modified poplar veneer.

[0010] (3) Preparation of poplar veneer lumber

[0011] The modified poplar veneer is arranged in the grain and hot-pressed to obtain poplar veneer lumber.

[0012] (4) Modification of rattan

[0013] The modified rattan is obtained by drying and treating the rattan, then heat treating the modified agent, and then adjusting the equilibrium moisture content in a constant temperature and humidity box.

[0014] (5) Hardening of rattan

[0015] The hardened rattan is obtained by grinding the modified rattan into powder and then curing by a curing agent, or by weaving the modified rattan into long fibers and then curing by hot pressing.

[0016] (6) Combination of poplar veneer laminated wood and hardened rattan

[0017] The anti-bending veneer laminated wood is obtained by opening a groove on the poplar veneer laminated wood and then clamping the hardened rattan into the groove.

[0018] Further, in step (1), the concentration of the sodium silicate solution is 10-40 wt%, the impregnation treatment time is 3-5 h, the drying treatment temperature of the raw wood is 103-105℃, the wood is dried to a moisture content of 10-15%, the drying treatment temperature of the poplar veneer is 60-65℃, the veneer is dried to a moisture content of 8-10%, and the temperature and humidity of the constant temperature and humidity box are 20-22℃ and 60-70%, respectively.

[0019] Further, in step (2), the specific process of the impregnation treatment is as follows: the plant oil is selected from silk gourd seed oil or rose essential oil or lemon essential oil, the plant oil is mixed with dichloromethane at a volume ratio of 1:1-3, the mixture is heated to 30℃ and stirred for 60-80 min to obtain an antibacterial plant oil, the poplar veneer is placed in a modification tank, the tank is sealed, the antibacterial plant oil is pumped into the tank, the pressure in the tank is increased to 0.8-1.2 MPa, the pressure is maintained for 10-15 min, then the poplar veneer is taken out, and the veneer is stored at room temperature for 24 h, and finally the veneer is dried to a moisture content of 8-10%.

[0020] Further, in step (3), the specific process of the hot pressing and gluing treatment is as follows: the adhesive film is selected from polyamide adhesive film (PA), polyvinyl chloride adhesive film (PVC), or vinyl acetate copolymer adhesive film (EVA), the film is first hot pressed at a temperature of 140-160℃ and a pressure of 0.8-1.2 MPa for 0.8-1.2 min / mm, and then cold pressed at a temperature of 20-30℃ and a pressure of 0.8-1.2 MPa for 10-20 min.

[0021] Further, in step (4), the specific process of the drying treatment is that the cathedral vine is dried at a temperature of 60-65 DEG C to a moisture content of 8-10%; the specific process of the modifier heat treatment is that the tung oil, the flax oil and the sunflower seed oil are mixed into mixed oil at a mass ratio of 1:1:1-3, then the mixed oil is added with 10-20% of the total mass of the mixed oil of the Brazil palm wax and 0.1-0.5% of the silicon dioxide to obtain the modifier, and the cathedral vine is soaked in the modifier at a temperature of 100-200 DEG C for 3-5 hours; the temperature of the constant-temperature and constant-humidity box is 20-22 DEG C, and the humidity is 60-70%.

[0022] Further, in step (5), the specific process of the solidification of the modified vine powder by the solidification agent is that the modified vine is ground into powder, sieved through a 40-60 mesh sieve, dried at a temperature of 103-105 DEG C for 24 hours, then mixed with the maleic anhydride grafted polyethylene (MAPE) at a mass ratio of 1-3:1, and extruded and granulated in a double-screw extruder at a temperature of 200-250 DEG C, a rotating speed of 140-160 r / min and a torque ratio of 61-65%, the extruded particles are crushed, then placed in a mold for hot pressing at a temperature of 130-150 DEG C and a pressure of 5-7 MPa for 10-15 minutes to obtain a formed piece, and finally sawed into a long strip shape.

[0023] Further, in step (5), the specific process of the solidification of the modified vine long fiber braid by hot pressing is that the modified vine is dried at a temperature of 103-105 DEG C for 24 hours, then cut into long fibers with a diameter of 2-5 mm, and subjected to a plying and twisting treatment by using a plying and twisting machine, then braided into a single-layer braid of the vine long fiber by using a high-speed walking horse braiding machine, and dried at a temperature of 103-105 DEG C for 24 hours, the dried single-layer braid of the vine long fiber is stacked in a mold for hot pressing at a temperature of 140-160 DEG C and a pressure of 3-5 MPa for 5-10 minutes to obtain a formed piece, and finally sawed into a long strip shape.

[0024] Further, the number of the plied threads subjected to the plying and twisting treatment ranges from 2 to 30, the twist factor ranges from 260 to 450, and the twist direction is S or Z, and the number of the layers is 3-5.

[0025] The application further provides a preparation method of the modified bending-resistant laminated veneer lumber.

[0026] The phase change microcapsules, the solidification agent and the thermoplastic resin are mixed and coated on the surface of the bending-resistant laminated veneer lumber prepared by the above preparation method, and dried to obtain the modified bending-resistant laminated veneer lumber.

[0027] Further, the preparation method of the phase change microcapsules is as follows.

[0028] a. Mix methyl acrylate (MA) and methyl methacrylate (MMA) in a mass ratio of 1-3:1, add 0.5-10% of the total volume of emulsifier, ultrasonic dispersion, to obtain a shell pre-emulsion;

[0029] b. Mix methyl acrylate (MA), methyl methacrylate (MMA) and paraffin, add 0.5-10% of the total volume of emulsifier, the mass ratio of MA to MMA is 1:2-3, the addition amount of paraffin is 6-10% of the total mass of MA and MMA, heat to 60-70℃ to liquefy paraffin, ultrasonic dispersion, to obtain a mixed solution, add 0.1-2% of the total mass of the mixed solution as initiator, heat the mixed solution to 80-90℃, add half of the initiator, constant temperature reaction for 1-2h, then cool to 30-40℃, filter treatment, then heat to 80-90℃, add the remaining half of the initiator and 2-2.8% of the total volume of the shell pre-emulsion in 2-3h, then constant temperature reaction for 1-2h, after the reaction is completed, cool to room temperature, filter treatment, dry in an oven at 600℃ for 24h, to obtain phase change microcapsules;

[0030] Further, the emulsifier is a mixture of non-ionic emulsifier OP-10 and sodium dodecyl benzene sulfonate (SDBS) in a mass ratio of 2-4:1.

[0031] The beneficial effects of the present application are embodied in:

[0032] (1) The present application utilizes plant essential oils such as luffa seed oil, rose essential oil, and lemon essential oil to modify poplar single boards, which not only improves the surface gloss of poplar single board laminated wood, gives it a natural fragrance, but also increases the antibacterial and preservative properties of poplar single board laminated wood, and enhances the durability of single board laminated wood.

[0033] (2) The present application takes full advantage of the advantages of poplar, such as easy planting, fast growth, and short renewal cycle, and the polyamide film (PA), polyvinyl chloride film (PVC), and ethylene-vinyl acetate copolymer (EVA) film applied during hot pressing improve the horizontal shear strength, lateral compressive strength, and elastic modulus of poplar single board laminated wood.

[0034] (3) The present application reuses discarded kudzu vine, which not only solves the problem of waste of vine as agricultural and forestry waste, but also greatly increases the source of raw materials.

[0035] (4) The invention uses a modifier prepared by mixing tung oil, linseed oil, sunflower seed oil in a certain ratio and adding Brazil palm wax in the modification process of the kudzu vine. Heat treatment can make the modifier form a highly unsaturated conjugated system to promote the rapid oxidation and polymerization of the three oils, forming a protective oil film on the surface of the kudzu vine. The performance of the kudzu vine can be effectively improved under the synergistic effect of tung oil, linseed oil and sunflower seed oil. At the same time, the kudzu vine is endowed with excellent waterproof and mildewproof properties, and the dimensional stability and hardness of the kudzu vine are enhanced.

[0036] (5) The invention uses recombination method and braiding method in the hardening process of the kudzu vine. The recombination method uses maleic anhydride grafted polyethylene (MAPE) as a coupling agent to increase the static bending strength, elastic modulus, tensile strength and impact strength of the kudzu vine, so that the kudzu vine as a filler of poplar single board laminated material can greatly improve its bending resistance. The braiding method treats the kudzu vine by adding strands and twisting, and braids the kudzu vine after adding strands and twisting, so that multiple kudzu vines are gathered together to improve the mechanical strength of the kudzu vine. At the same time, the braided kudzu vine can be better plastic, which is convenient for filling the poplar single board laminated material.

[0037] (6) The invention adopts the method of back slotting and filling the hardened kudzu vine for the poplar single board laminated material, which solves the problem of easy bending and breaking of the poplar single board laminated material due to the easy warping and deformation of the poplar single board and poor dimensional stability. Under the premise of not affecting the mechanical strength of the poplar single board laminated material, it endows it with good bending resistance and dimensional stability.

[0038] (7) The invention uses epoxy resin as the matrix and mixes phase change microcapsules to spray treat the poplar single board laminated material, forming an epoxy resin layer on the surface of the poplar single board laminated material. On the one hand, the epoxy resin layer improves the antibacterial property of the poplar single board laminated material, and on the other hand, the mixed polyacrylate paraffin phase change microcapsules improve the temperature control performance of the poplar single board laminated material. Epoxy resin has secondary hydroxyl and epoxy groups, which can react with isocyanate. Using epoxy resin as a polyhydroxy component combines the advantages of polyurethane and epoxy resin, and has good adhesive strength and chemical resistance. DETAILED DESCRIPTION

[0039] The invention will be further described below in conjunction with examples:

[0040] Unless otherwise specified, the raw materials used in the examples of the invention are commercially available or can be obtained by those skilled in the art. Unless otherwise specified, the methods used in the examples of the invention are methods mastered by those skilled in the art. Among them:

[0041] Maleic anhydride grafted polyethylene: purchased from Nanjing Feiteng New Material Technology Co., Ltd., density: 0.94-0.96 g / cm3, melt index 1-3 g / 10 min, grafting rate: 0.8-1.2%;

[0042] Butyl acrylate (BA), methyl methacrylate (MMA): both are analytical pure, purchased from Tianjin Bodu Chemical Co., Ltd.;

[0043] Paraffin wax: industrial grade, purchased from Beijing Yanshan Branch of China Petroleum Chemical Co., Ltd.;

[0044] Epoxy resin: purchased from Shenzhen Jiyida Chemical Co., Ltd.;

[0045] The sources of polyamide adhesive film, polyvinyl chloride adhesive film and vinyl acetate copolymer adhesive film are shown in Table 1:

[0046] Table 1

[0047]

[0048] Example 1

[0049] Preparation of modified bending-resistant laminated wood veneer

[0050] (1) Preparation of poplar veneer

[0051] Select a log with a diameter of 200 mm, immerse it in a sodium silicate solution with a concentration of 10 wt% for 3 h, remove it and wash it clean with deionized water, and then place it in an electrically heated constant temperature air drying oven at a temperature of 103℃ until the moisture content is 15%, then use a rotary cutting machine to cut out poplar veneer with a length of 244 mm, a width of 122 mm and a thickness of 4 mm, place the poplar veneer in a forced air drying oven at a temperature of 65℃ until the moisture content is 10%, and then place it in a constant temperature and humidity box at a temperature of 20℃ and a humidity of 65% to adjust the equilibrium moisture content;

[0052] (2) Modification of poplar veneer

[0053] Take the wax gourd seed oil, add an equal volume of dichloromethane, heat to 30℃ and stir for 60 min to obtain the antibacterial plant oil, place the poplar veneer adjusted to the equilibrium moisture content into a modification tank, seal the tank, and use the negative pressure in the tank to draw the antibacterial plant oil into the modification tank, then increase the pressure in the tank to 0.8 MPa and maintain the pressure for 15 min, then remove the poplar veneer, let it stand at room temperature for 24 h, and then place it in a forced air drying oven at a temperature of 65℃ until the moisture content is 10% to obtain the modified poplar veneer;

[0054] (3) Preparation of poplar veneer laminated wood

[0055] 5 layers of modified poplar veneers are arranged in the grain direction, polyamide adhesive film is laid between the modified poplar veneers, and then the modified poplar veneers are placed in a hot press, the temperature is set to 140℃, the pressure is set to 1.0MPa, and the hot pressing time is set to 24min, then the modified poplar veneers are placed in a cold press, the temperature is set to 20℃, the pressure is set to 1.0MPa, and the cold pressing time is set to 15min, and then the poplar veneer laminated wood is obtained;

[0056] (4) Modification of rattan

[0057] The tung oil, the flax oil and the sunflower seed oil are mixed into mixed oil at a mass ratio of 1:1:1, then 10% of the total mass of the mixed oil of the Brazil palm wax (previously stirred at 14℃ and 300r / min until dissolved, the same below) and 0.1% of the total mass of the mixed oil of the silicon dioxide are added, and then the modifier is obtained;

[0058] Some healthy wisteria sinensis are selected, the stems are cut (the stem diameter at 2m above the base is 0.50-2.00cm, the stem length is 16.0-20.0m, and the internode length is 16.5-26.5cm after felling, and the stems are cut at the middle part to obtain stems with a length of about 122cm, the same below), the stems are placed in a forced air drying oven and dried at a temperature of 65℃ until the moisture content is 10%, and then the stems are soaked in the modifier at a temperature of 100℃ for 5h, and then the modified rattan is obtained by adjusting the stems to the equilibrium moisture content in a constant temperature and humidity box at a temperature of 20℃ and a humidity of 65%;

[0059] (5) Hardening of the rattan

[0060] The modified rattan is ground into powder, the powder is sieved through a 40 mesh sieve, and then the powder is placed in a drying oven and dried at a temperature of 103℃ for 24h to obtain rattan powder, the rattan powder is mixed with maleic anhydride grafted polyethylene at a mass ratio of 2:1, and then the mixture is fed into a twin-screw extruder for extrusion and granulation, the extruder is set at a temperature of 200℃, a rotation speed of 140r / min, and a torque ratio of 61%, the extruded particles are pulverized, the particles are filled into a mold with a length of 244mm, a width of 50mm, and a height of 5mm, the mold is placed in a hot press, and the mold is hot pressed at a temperature of 140℃ and a pressure of 6MPa for 10min to obtain a formed piece, and finally the formed piece is sawn into a long strip-shaped test piece with a length of 244mm, a width of 10mm, and a height of 2mm, and the long strip-shaped test piece is the hardened rattan;

[0061] (6) Combination of the poplar veneer laminated wood and the hardened rattan

[0062] The poplar veneer laminated wood is placed in an electric heating constant temperature forced air drying oven and dried at a temperature of 60℃ for 24h, three long grooves with a length of 244mm, a width of 10mm, and a depth of 2mm are cut on the back of the dried poplar veneer laminated wood along the grain direction by using a fine woodworking band saw, the grooves are spaced 25cm apart, and the hardened rattan is inserted into the cut long grooves to obtain the bending-resistant veneer laminated wood;

[0063] (7) Preparation of phase change microcapsules

[0064] The non-ionic emulsifier OP-10 and sodium dodecyl benzene sulfonate SDBS were mixed in a mass ratio of 3:1 to make the emulsifier;

[0065] MA and MMA were mixed in a mass ratio of 2:1, 10% of the total volume of the emulsifier was added, and ultrasonic dispersion was performed for 30 min to obtain a shell pre-emulsion;

[0066] MA, MMA and paraffin were mixed, 5% of the total volume of the emulsifier was added, the mass ratio of MA to MMA was 3:7, the addition amount of paraffin was 6% of the total mass of MA and MMA, the temperature was raised to 60°C to liquefy the paraffin, and ultrasonic dispersion was performed to obtain a mixed liquid, 1% of the total mass of the mixed liquid was added as an initiator, the mixed liquid was heated to 80°C, half of the initiator was added, and constant temperature reaction was performed for 1 h, then cooled to 40°C, filtered through a 75 μm screen, then heated to 80°C, and the remaining half of the initiator and 2% of the total volume of the mixed liquid were gradually added within 2 h, and constant temperature reaction was performed for another 1 h, then cooled to room temperature, filtered through a 75 μm screen, and finally dried in an oven at 600°C for 24 h to obtain phase change microcapsules;

[0067] (8) Coating of phase change microcapsules

[0068] The epoxy resin and ethylenediamine were mixed in a mass ratio of 1:2, 4% of the total mass of the phase change microcapsules was added, stirred for 3 min, coated on the surface of the bending-resistant laminated wood veneer with a thickness of 20 μm, and finally air-dried for 24 h to obtain a modified bending-resistant laminated wood veneer.

[0069] Example 2

[0070] Preparation of modified bending-resistant laminated wood veneer

[0071] (1) Preparation of poplar veneer

[0072] A 200 mm diameter log was immersed in a 20 wt% sodium silicate solution for 4 h, taken out and washed clean with deionized water, and then placed in an electric heating constant temperature air drying oven at a temperature of 105°C to dry to a moisture content of 10%, and then a poplar veneer with a length of 244 mm, a width of 122 mm and a thickness of 4 mm was cut out with a rotary cutting machine, the poplar veneer was placed in a drying oven at a temperature of 60°C to dry to a moisture content of 8%, and then placed in a constant temperature and humidity box at a temperature of 21°C and a humidity of 60% to adjust to the equilibrium moisture content;

[0073] (2) Modification of poplar veneer

[0074] Take rose essential oil, add 2 times the volume of dichloromethane, warm to 30℃ and stir for 70 min to obtain antibacterial plant oil, place the poplar veneer with adjusted equilibrium moisture content into a modification tank, seal the tank, and draw the vacuum in the tank to -0.089 MPa, use the negative pressure in the tank to draw the antibacterial plant oil into the modification tank, then increase the pressure in the tank to 1.0 MPa, maintain the pressure for 12 min, then release the pressure and take out the poplar veneer, store at room temperature for 24 h, then place in a forced air drying oven at 60℃ until the moisture content is 8%, to obtain the modified poplar veneer;

[0075] (3) Preparation of poplar veneer laminated wood

[0076] Stack 5 layers of modified poplar veneer in the grain direction, lay polyvinyl chloride film between the modified poplar veneer, and place in a hot press, set the temperature to 150℃ and the pressure to 0.8 MPa, hot press for 22 min, then place in a cold press, set the temperature to 22℃ and the pressure to 0.8 MPa, cold press for 20 min, to obtain poplar veneer laminated wood;

[0077] (4) Modification of rattan

[0078] Mix tung oil, flax oil, and sunflower seed oil in a mass ratio of 1:1:2 to obtain mixed oil, then add 12% of the total mass of the mixed oil of Brazil palm wax and 0.2% of the total mass of the mixed oil of silicon dioxide to obtain a modifier;

[0079] Select several healthy Chinese wisteria plants, cut the stems, dry in a forced air drying oven at 60℃ until the moisture content is 8%, and finally immerse in the modifier, soak at 120℃ for 4 h, then adjust to the equilibrium moisture content in a constant temperature and humidity chamber at 21℃ and 70% humidity, to obtain modified rattan;

[0080] (5) Hardening of rattan

[0081] Grind the modified rattan into powder, pass through a 50 mesh sieve, and dry in a drying oven at 105℃ for 24 h to obtain rattan powder, mix the rattan powder with maleic anhydride grafted polyethylene in a mass ratio of 1:1, then feed into a twin-screw extruder for extrusion and granulation, set the extruder conditions to a temperature of 250℃, a rotation speed of 150 r / min, and a torque ratio of 63%, pass the extruded particles through a pulverizer, fill a mold with dimensions of 244 mm x 50 mm x 5 mm, place in a hot press at a temperature of 130℃ and a pressure of 7 MPa for 15 min to obtain a formed piece, and finally saw into long strip-shaped test pieces with dimensions of 244 mm x 10 mm x 2 mm, which are the hardened rattan;

[0082] (6) Combination of poplar veneer laminated wood and hardened rattan

[0083] Poplar veneer laminated wood is put into an electric heating constant temperature drying oven and dried at 60℃ for 24h, three long grooves with a length of 244mm, a width of 10mm and a depth of 2mm are cut on the back of the dried poplar veneer laminated wood along the grain direction by using a fine woodworking band saw, the grooves are spaced 25cm apart, and hardened rattan is inserted into the cut grooves to make a bending-resistant veneer laminated wood;

[0084] (7) Preparation of phase change microcapsules

[0085] The non-ionic emulsifier OP-10 and sodium dodecyl benzene sulfonate SDBS are mixed in a mass ratio of 4:1 to prepare an emulsifier;

[0086] MA and MMA are mixed in a mass ratio of 3:1, 4% of the total volume of the emulsifier is added, and ultrasonic dispersion is performed for 30min to obtain a shell pre-emulsion;

[0087] MA, MMA and paraffin are mixed, 8% of the total volume of the emulsifier is added, the mass ratio of MA to MMA is 1:2, the amount of paraffin added is 7% of the total mass of MA and MMA, the temperature is raised to 65℃ to liquefy the paraffin, and ultrasonic dispersion is performed to obtain a mixed solution, 1.5% of the total mass of the mixed solution is sodium persulfate as an initiator, the mixed solution is heated to 90℃, half of the initiator is added, and constant temperature reaction is performed for 1.5h, then it is cooled to 35℃, filtered through a 75μm screen, then heated to 90℃, and the remaining half of the initiator and 2.8% of the total volume of the mixed solution are gradually added within 3h, and constant temperature reaction is performed for another 1.5h, after the reaction is completed, it is cooled to room temperature, filtered through a 75μm screen, and dried in an oven at 600℃ for 24h to obtain phase change microcapsules;

[0088] (8) Coating of phase change microcapsules

[0089] Epoxy resin and ethylenediamine are mixed in a mass ratio of 1:2, 4% of the total mass of the phase change microcapsules is added, stirred for 3min, coated on the surface of the bending-resistant veneer laminated wood with a thickness of 20μm, and finally dried for 24h in a ventilated oven to obtain a modified bending-resistant veneer laminated wood.

[0090] Example 3

[0091] Preparation of modified bending-resistant veneer laminated wood

[0092] (1) Preparation of poplar veneer

[0093] Select the diameter of 200 mm logs, immersed in a concentration of 30wt% sodium silicate solution for 5h, take out and clean with deionized water, after the surface moisture dry, placed in the electric heating constant temperature drying oven at 104℃ temperature drying to moisture content 14%, then use the rotary cutting machine selected out of long 244mm, wide 122mm, thick 4mm thick poplar veneer, poplar veneer placed in the drying oven at 62℃ temperature drying to moisture content 9%, and then placed in the temperature 22℃, humidity 70% constant temperature and humidity box to adjust to the equilibrium moisture content;

[0094] (2) Modification of poplar veneer

[0095] Take the lemon oil, add 3 times the volume of dichloromethane, heated to 30℃ stirring 80min, get antibacterial plant oil, the poplar veneer adjusted to the equilibrium moisture content into the modification tank, sealed tank, the tank vacuum degree to -0.089MPa, using the negative pressure in the tank into the modification tank antibacterial plant oil, then the tank pressure increased to 1.1MPa, pressure 13min, then unloading poplar veneer, room temperature storage 24h, and then placed in the drying oven at 60℃ temperature drying to moisture content 9%, get modified poplar veneer;

[0096] (3) Preparation of poplar veneer laminated wood

[0097] 5 layers of modified poplar veneer in the order of grain assembly, vinyl acetate copolymer film between the modified poplar veneer, put into the hot press, set temperature 160℃, pressure 1.2MPa, hot pressing 20min, then placed in the cold press, set temperature 24℃, pressure 1.2MPa, cold pressing 10min, get poplar veneer laminated wood;

[0098] (4) Modification of rattan

[0099] The tung oil, linseed oil, sunflower seed oil mixed into mixed oil according to the mass ratio of 1:1:3, then add 14% of the total mass of the mixed oil of Brazil palm wax and 0.3% of the total mass of the mixed oil of silicon dioxide, get modifier;

[0100] Select several healthy wisteria, cut the stems, placed in the drying oven at 65℃ temperature drying to moisture content 9%, finally immersed in the modifier, at 150℃ temperature for 3h, and then placed in the temperature 22℃, humidity 60% constant temperature and humidity box to adjust to the equilibrium moisture content, get modified rattan;

[0101] (5) Hardening of rattan

[0102] The modified rattan is ground into powder, sieved through a 50-mesh sieve, and dried in a drying oven at 104℃ for 24h to obtain rattan powder. The rattan powder is mixed with grafted polyethylene with maleic anhydride at a mass ratio of 3:1, and then fed into a twin-screw extruder for extrusion and granulation. The extruder is set at a temperature of 225℃, a rotation speed of 160r / min, and a torque ratio of 65%. The extruded granules are filled into a mold with a length, width, and height of 244mm x 50mm x 5mm, and placed in a hot press at a temperature of 150℃ and a pressure of 5-7MPa for 13min to obtain a molded piece. Finally, the molded piece is sawn into a long strip-shaped test piece with a length, width, and height of 244mm x 10mm x 2mm, which is the hardened rattan;

[0103] (6) Combination of poplar veneer laminated wood and hardened rattan

[0104] The poplar veneer laminated wood is placed in an electric heating constant temperature air drying oven and dried at a temperature of 60℃ for 24h. Three long grooves with a length of 244mm, a width of 10mm, and a depth of 2mm are cut on the back of the dried poplar veneer laminated wood along the grain direction using a fine woodworking band saw. The grooves are spaced 25cm apart. The hardened rattan is inserted into the cut grooves to obtain a bending-resistant veneer laminated wood.

[0105] (7) Preparation of phase change microcapsules

[0106] The non-ionic emulsifier OP-10 and sodium dodecyl benzene sulfonate SDBS are mixed at a mass ratio of 2:1 to obtain an emulsifier.

[0107] MA and MMA are mixed at a mass ratio of 1:1. An emulsifier with a total volume of 6% of the mixture is added. The mixture is ultrasonically dispersed for 30min to obtain a shell pre-emulsion.

[0108] MA, MMA, and paraffin are mixed. An emulsifier with a total volume of 10% of the mixture is added. The mass ratio of MA to MMA is 1:3. The amount of paraffin added is 8% of the total mass of MA and MMA. The mixture is heated to 70℃ to liquefy the paraffin. The mixture is ultrasonically dispersed. An initiator with a mass of 2% of the total mass of the mixture is added. The mixture is heated to 85℃. Half of the initiator is added. The mixture is kept at a constant temperature for 2h. Then the mixture is cooled to 30℃. The mixture is filtered through a 75μm sieve. The mixture is heated to 85℃. The remaining half of the initiator and a shell pre-emulsion with a total volume of 2.2% of the mixture are gradually added within 2h. The mixture is kept at a constant temperature for another 2h. After the reaction is completed, the mixture is cooled to room temperature. The mixture is filtered through a 75μm sieve. The mixture is dried in an oven at 600℃ for 24h to obtain phase change microcapsules.

[0109] (8) Coating of phase change microcapsules

[0110] The epoxy resin and ethylenediamine were mixed in a mass ratio of 1:2, 4% of the total mass of the two was added to phase change microcapsules, stirred for 3 min, coated on the surface of the bending-resistant laminated veneer lumber at a thickness of 20 μm, and finally air-dried for 24 h to obtain the modified bending-resistant laminated veneer lumber.

[0111] Example 4

[0112] Preparation of modified bending-resistant laminated veneer lumber

[0113] (1) Preparation of poplar veneer

[0114] A 200 mm diameter log was selected, immersed in a 40 wt% sodium silicate solution for 3 h, removed and washed clean with deionized water, and after the surface moisture was air-dried, placed in an electrically heated constant temperature air drying oven at a temperature of 103℃ and dried to a moisture content of 12%, then a rotary cutting machine was used to cut out poplar veneer with a length of 244 mm, a width of 122 mm, and a thickness of 4 mm, the poplar veneer was placed in a forced air drying oven at a temperature of 60℃ and dried to a moisture content of 9%, and then placed in a constant temperature and humidity chamber at a temperature of 20℃ and a humidity of 60% to adjust to the equilibrium moisture content;

[0115] (2) Modification of poplar veneer

[0116] The wax gourd seed oil was taken, 2 times the volume of dichloromethane was added, the temperature was raised to 30℃ and stirred for 60 min to obtain the antibacterial plant oil, the poplar veneer adjusted to the equilibrium moisture content was placed in a modification tank, the tank was sealed, the vacuum degree in the tank was extracted to -0.089 MPa, the antibacterial plant oil was extracted into the modification tank by using the negative pressure in the tank, the pressure in the tank was increased to 1.2 MPa, and the pressure was maintained for 10 min, then the poplar veneer was taken out, and the poplar veneer was placed in a forced air drying oven at a temperature of 65℃ and dried to a moisture content of 9% to obtain the modified poplar veneer;

[0117] (3) Preparation of poplar veneer laminated lumber

[0118] Five layers of modified poplar veneer were arranged in the grain direction, polyamide adhesive film was laid between the modified poplar veneer, and placed in a hot press, the temperature was set to 140℃, the pressure was set to 1.2 MPa, and hot pressing was performed for 18 min, then placed in a cold press, the temperature was set to 26℃, the pressure was set to 1.1 MPa, and cold pressing was performed for 10 min to obtain the poplar veneer laminated lumber;

[0119] (4) Modification of rattan

[0120] The tung oil, linseed oil, and sunflower seed oil were mixed in a mass ratio of 1:1:1 to form a mixed oil, and then 16% of the total mass of the mixed oil was added to Brazil palm wax and 0.4% of the total mass of the mixed oil was added to silicon dioxide to obtain a modifier;

[0121] Select several healthy growth of the plant, cutting stems, placed in the air drying oven at 60°C temperature drying to moisture content of 8%, finally immersed in the modifier, at 160°C temperature for 3h, and then placed in the temperature 20°C, humidity 65% constant temperature and humidity box to adjust to the equilibrium moisture content, get modified rattan;

[0122] (5) Rattan hardening

[0123] Modified rattan powder, 60 mesh sieve, placed in the drying oven at 103°C temperature drying 24h, get rattan powder, rattan powder and maleic anhydride grafted polyethylene according to the mass ratio of 2:1 mixed, then put into the twin screw extruder extrusion granulation, extruder conditions set to temperature 200°C, speed 150r / min, torque ratio 62%, extruded particles after powder, fill in the length width height 244mm x 50mm x 5mm mold, put into the hot press, at a temperature of 130°C, pressure 5MPa hot pressing 12min, get the molding, finally sawed into long width height 244mm x 10mm x 2mm long strip-shaped test piece, namely the hardened rattan;

[0124] (6) Poplar veneer laminated wood and hardened rattan combination

[0125] Poplar veneer laminated wood into the electric heating constant temperature drying oven at 60°C temperature drying 24h, with fine woodworking band saw machine in the back of the dried poplar veneer laminated wood along the grain direction cutting three long 244mm, 10mm wide, depth 2mm long slot, slot spacing 25cm, in the cutting long slot inserted hardened rattan, made of bending veneer laminated wood;

[0126] (7) Preparation of phase change microcapsules

[0127] The nonionic emulsifier OP-10 and sodium dodecyl benzene sulfonate SDBS mixed according to the mass ratio of 2:1, made of emulsifier;

[0128] The MA and MMA mixed according to the mass ratio of 1:1, adding 2% of the total volume of emulsifier, ultrasonic dispersion 30min, get shell pre emulsion;

[0129] The MA, MMA and paraffin wax are mixed, 10% of the total volume of the three is added with emulsifier, the mass ratio of MA to MMA is 3:7, the amount of paraffin wax is 9% of the total mass of MA and MMA, the temperature is raised to 70°C to liquefy the paraffin wax, ultrasonic dispersion is performed, a mixed solution is obtained, 0.5% of the total mass of the mixed solution is added with sodium persulfate as initiator, the mixed solution is heated to 80°C, half of the initiator is added, constant temperature reaction is performed for 1h, then it is cooled to 30°C, 75μm screen filter is used, then it is heated to 80°C, the remaining half of the initiator and 2.4% of the total volume of the mixed solution are gradually added with shell pre-emulsion within 2h, constant temperature reaction is performed for 2h, after the reaction is completed, it is cooled to room temperature, 75μm screen filter is used, drying is performed in an oven at 600°C for 24h, and phase change microcapsules are obtained;

[0130] (8) Coating of phase change microcapsules

[0131] The epoxy resin and ethylenediamine are mixed in a mass ratio of 1:2, 4% of the total mass of the two is added with phase change microcapsules, stirring is performed for 3min, the surface of the bending-resistant laminated wood veneer is coated with a thickness of 20μm, and finally air drying is performed for 24h, and a modified bending-resistant laminated wood veneer is obtained.

[0132] Example 5

[0133] Preparation of modified bending-resistant laminated wood veneer

[0134] (1) Preparation of poplar veneer

[0135] A 200mm diameter log is selected, immersed in a 10wt% sodium silicate solution for 5h, taken out and cleaned with deionized water, after the surface moisture is air dried, placed in an electric heating constant temperature air drying oven at a temperature of 104°C and dried to a moisture content of 14%, then a poplar veneer with a length of 244mm, a width of 122mm and a thickness of 4mm is selected and cut out with a rotary cutting machine, placed in an air drying oven at a temperature of 60°C and dried to a moisture content of 10%, and then placed in a constant temperature and humidity box at a temperature of 21°C and a humidity of 65% and adjusted to the equilibrium moisture content.

[0136] (2) Modification of poplar veneer

[0137] The wax is heated to 30°C and stirred for 70min to obtain the antibacterial plant oil, the poplar veneer with the adjusted equilibrium moisture content is placed in a modification tank, the tank body is sealed, the vacuum degree in the tank body is extracted to-0.089MPa, the antibacterial plant oil is extracted into the modification tank by using the negative pressure in the tank body, the pressure in the tank body is increased to 0.8MPa, and the pressure is maintained for 15min, then the poplar veneer is taken out, placed at room temperature for 24h, and then placed in an air drying oven at a temperature of 60°C and dried to a moisture content of 10%, and a modified poplar veneer is obtained.

[0138] (3) Preparation of poplar laminated wood veneer

[0139] 5 layers of modified poplar veneer were arranged in the grain direction, and polyamide adhesive film was laid between the modified poplar veneer, and then placed in a hot press, with a temperature of 140℃, a pressure of 1.0 MPa, and hot pressing for 24 min, and then placed in a cold press, with a temperature of 20℃, a pressure of 1.0 MPa, and cold pressing for 15 min, to obtain a poplar veneer laminated wood;

[0140] (4) Modification of rattan

[0141] The tung oil, flax oil and sunflower seed oil were mixed into mixed oil at a mass ratio of 1:1:2, and then 10% of the total mass of the mixed oil was added with Brazil palm wax and 0.1% of the total mass of the mixed oil was added with silicon dioxide to obtain a modifier;

[0142] Several healthy wisteria sinensis were selected, and the stems were cut (the diameter of the stem was 0.50-2.00 cm, the length of the stem was 16.0-20.0 m, and the internode length was 16.5-26.5 cm, measured at 2 m above the base after felling, and the stem was cut at the middle, the same below), and then dried in a forced air drying oven at a temperature of 60℃ until the moisture content was 9%, and finally soaked in the modifier for 3 h at a temperature of 200℃, and then adjusted to the equilibrium moisture content in a constant temperature and humidity chamber at a temperature of 22℃ and a humidity of 65% to obtain modified rattan;

[0143] (5) Hardening of rattan

[0144] The modified rattan was placed in an electric heating constant temperature forced air drying oven at a temperature of 103℃ for 24 h, and then cut into long fibers with a diameter of 2 mm, and then treated by plying and twisting with a plying and twisting machine, with a plying range of 8 strands, a twisting factor range of 260, and a twisting direction of S and Z, and then woven into a rattan long fiber single layer woven fabric on a high speed walking horse weaving machine, and then dried at a temperature of 103℃ for 24 h, and then 5 layers of the dried rattan long fiber single layer woven fabric were stacked in a mold with a length, width and height of 244 mm x 50 mm x 5 mm, and then placed in a hot press at a temperature of 140℃ and a pressure of 3 MPa for 10 min to obtain a formed piece, and finally sawn into a long strip-shaped test piece with a length, width and height of 244 mm x 10 mm x 2 mm, which is a hardened rattan;

[0145] (6) Combination of poplar veneer laminated wood and hardened rattan

[0146] The poplar veneer laminated wood was placed in an electric heating constant temperature forced air drying oven at a temperature of 60℃ for 24 h, and then three long grooves with a length of 244 mm, a width of 10 mm and a depth of 2 mm were cut on the back of the dried poplar veneer laminated wood along the grain direction with a fine woodworking band saw, with a groove spacing of 25 cm, and then the hardened rattan was inserted into the cut long grooves to obtain a bending-resistant veneer laminated wood;

[0147] (7) Preparation of phase change microcapsules

[0148] The non-ionic emulsifier OP-10 and sodium dodecyl benzene sulfonate SDBS were mixed in a mass ratio of 3:1 to prepare the emulsifier;

[0149] MA and MMA were mixed in a mass ratio of 2:1, 10% of the total volume of the emulsifier was added, and ultrasonic dispersion was performed for 30 min to obtain a shell pre-emulsion;

[0150] MA, MMA and paraffin were mixed, 5% of the total volume of the emulsifier was added, the mass ratio of MA to MMA was 3:7, the addition amount of paraffin was 6% of the total mass of MA and MMA, the temperature was raised to 60°C to liquefy the paraffin, and ultrasonic dispersion was performed to obtain a mixed solution, 1% of the total mass of the mixed solution was sodium persulfate as an initiator, the mixed solution was heated to 80°C, half of the initiator was added, and constant temperature reaction was performed for 1 h, then it was cooled to 40°C, filtered through a 75 μm screen, then heated to 80°C, and the remaining half of the initiator and 2% of the total volume of the mixed solution were gradually added within 2 h, and constant temperature reaction was performed for another 1 h, then it was cooled to room temperature, filtered through a 75 μm screen, and finally dried in an oven at 600°C for 24 h to obtain phase change microcapsules;

[0151] (8) Coating of phase change microcapsules

[0152] The epoxy resin and ethylenediamine were mixed in a mass ratio of 1:2, 4% of the total mass of the phase change microcapsules was added, stirred for 3 min, coated on the surface of the bending-resistant laminated wood veneer at a thickness of 20 μm, and finally air-dried for 24 h to obtain a modified bending-resistant laminated wood veneer.

[0153] Example 6

[0154] Preparation of modified bending-resistant laminated wood veneer

[0155] (1) Preparation of poplar veneer

[0156] A 200 mm diameter log was immersed in a 20 wt% sodium silicate solution for 4 h, taken out and washed clean with deionized water, and then placed in an electric heating constant temperature air drying oven at a temperature of 105°C to dry to a moisture content of 15%, and then a poplar veneer with a length of 244 mm, a width of 122 mm and a thickness of 4 mm was cut out using a rotary cutting machine, the poplar veneer was placed in a drying oven at a temperature of 65°C to dry to a moisture content of 9%, and then placed in a constant temperature and humidity box at a temperature of 22°C and a humidity of 65% to adjust to an equilibrium moisture content;

[0157] (2) Modification of poplar veneer

[0158] Take rose essential oil, add 2 times the volume of dichloromethane, warm to 30℃ and stir for 80 min to obtain antibacterial plant oil. Put the poplar veneer with adjusted equilibrium moisture content into a modification tank, seal the tank, and draw the vacuum in the tank to -0.089 MPa. Use the negative pressure in the tank to draw the antibacterial plant oil into the modification tank. Increase the pressure in the tank to 1.2 MPa and maintain the pressure for 10 min. Then, discharge the poplar veneer and store it at room temperature for 24 h. Then, place it in a forced air drying oven at a temperature of 65℃ until the moisture content is 9%. Thus, the modified poplar veneer is obtained.

[0159] (3) Preparation of poplar veneer laminated wood

[0160] Stack 5 layers of modified poplar veneer in the grain direction, and lay polyvinyl chloride film between the modified poplar veneers. Put them into a hot press, set the temperature to 150℃ and the pressure to 0.8 MPa, and hot-press for 22 min. Then, place them in a cold press, set the temperature to 22℃ and the pressure to 0.8 MPa, and cold-press for 20 min. Thus, the poplar veneer laminated wood is obtained.

[0161] (4) Modification of rattan

[0162] Mix tung oil, flax oil, and sunflower seed oil in a mass ratio of 1:1:3 to obtain mixed oil. Then, add 12% of the total mass of the mixed oil of Brazil palm wax and 0.2% of the total mass of the mixed oil of silicon dioxide to obtain a modifier.

[0163] Select several healthy wisteria plants, cut the stems, and dry them in a forced air drying oven at a temperature of 65℃ until the moisture content is 10%. Then, immerse them in the modifier and soak them at a temperature of 150℃ for 4 h. Finally, adjust them to the equilibrium moisture content in a constant temperature and humidity chamber at a temperature of 21℃ and a humidity of 65%. Thus, the modified rattan is obtained.

[0164] (5) Hardening of rattan

[0165] Place the modified rattan in an electric heating constant temperature forced air drying oven at a temperature of 104℃ and dry it for 24 h. Then, cut it into long fibers with a diameter of 3 mm. Use a doubling and twisting machine to perform doubling and twisting treatment. The number of strands of the doubled yarn ranges from 16 strands, and the twist factor ranges from 350. The twist direction is S or Z. Then, place the doubled yarn on a high-speed walking weaving machine to weave a single-layer rattan long fiber woven fabric. Dry the single-layer rattan long fiber woven fabric at a temperature of 104℃ for 24 h. Then, stack 5 layers of the dried single-layer rattan long fiber woven fabric in a mold with a length, width, and height of 244 mm x 50 mm x 5 mm. Put the stacked single-layer rattan long fiber woven fabric into a hot press at a temperature of 150℃ and a pressure of 4 MPa and hot-press for 8 min. Thus, a formed piece is obtained. Finally, saw the formed piece into a long strip-shaped test piece with a length, width, and height of 244 mm x 10 mm x 2 mm. Thus, the hardened rattan is obtained.

[0166] (6) Combination of poplar veneer laminated wood and hardened rattan

[0167] Poplar veneer laminated wood is put into an electric heating constant temperature drying oven and dried at 60℃ for 24h, three long grooves with a length of 244mm, a width of 10mm and a depth of 2mm are cut on the back of the dried poplar veneer laminated wood along the grain direction by using a fine woodworking band saw, the grooves are spaced 25cm apart, and hardened rattan is inserted into the cut grooves to make a bending-resistant veneer laminated wood;

[0168] (7) Preparation of phase change microcapsules

[0169] The non-ionic emulsifier OP-10 and sodium dodecyl benzene sulfonate SDBS are mixed in a mass ratio of 4:1 to prepare an emulsifier;

[0170] MA and MMA are mixed in a mass ratio of 3:1, 4% of the total volume of the emulsifier is added, and ultrasonic dispersion is performed for 30min to obtain a shell pre-emulsion;

[0171] MA, MMA and paraffin are mixed, 8% of the total volume of the emulsifier is added, the mass ratio of MA to MMA is 1:2, the amount of paraffin added is 7% of the total mass of MA and MMA, the temperature is raised to 65℃ to liquefy the paraffin, and ultrasonic dispersion is performed to obtain a mixed solution, 1.5% of the total mass of the mixed solution is sodium persulfate as an initiator, the mixed solution is heated to 90℃, half of the initiator is added, and constant temperature reaction is performed for 1.5h, then it is cooled to 35℃, filtered through a 75μm screen, then heated to 90℃, and the remaining half of the initiator and 2.8% of the total volume of the shell pre-emulsion are gradually added within 3h, and constant temperature reaction is performed for another 1.5h, after the reaction is completed, it is cooled to room temperature, filtered through a 75μm screen, and dried in an oven at 600℃ for 24h to obtain phase change microcapsules;

[0172] (8) Coating of phase change microcapsules

[0173] Epoxy resin and ethylenediamine are mixed in a mass ratio of 1:2, 4% of the total mass of the phase change microcapsules is added, stirred for 3min, coated on the surface of the bending-resistant veneer laminated wood at a thickness of 20μm, and finally dried for 24h in a ventilated oven to obtain a modified bending-resistant veneer laminated wood.

[0174] Example 7

[0175] Preparation of modified bending-resistant veneer laminated wood

[0176] (1) Preparation of poplar veneer

[0177] Select the diameter of 200 mm logs, immersed in a concentration of 30wt% sodium silicate solution for 3h, take out and clean with deionized water, after the surface moisture dry, placed in the electric heating constant temperature drying oven at 105℃ temperature drying to moisture content 12%, then use the rotary cutting machine selected out of long 244mm, wide 122mm, thick 4mm thick poplar veneer, poplar veneer placed in the drying oven at 60℃ temperature drying to moisture content 8%, again placed in the temperature 20℃, humidity 70% constant temperature and humidity box to adjust to the equilibrium moisture content;

[0178] (2) Modification of poplar veneer

[0179] Take the lemon oil, add 3 times the volume of dichloromethane, heated to 30℃ stirring 60min, get antibacterial plant oil, the poplar veneer adjusted to the equilibrium moisture content into the modification tank, sealed tank, the tank vacuum degree to -0.089MPa, using the negative pressure in the tank into the modification tank antibacterial plant oil, again the tank pressure to 1.0MPa, pressure 12min, then unloading poplar veneer, room temperature storage 24h, again placed in the drying oven at 60℃ temperature drying to moisture content 8%, get modified poplar veneer;

[0180] (3) Preparation of poplar veneer laminated wood

[0181] 5 layers of modified poplar veneer in the order of grain assembly, vinyl acetate copolymer film between the modified poplar veneer, put into the hot press, set temperature 160℃, pressure 1.2MPa, hot pressing 20min, then placed in the cold press, set temperature 24℃, pressure 1.2MPa, cold pressing 10min, get poplar veneer laminated wood;

[0182] (4) Modification of rattan

[0183] The tung oil, linseed oil, sunflower seed oil mixed into mixed oil according to the mass ratio 1:1:1, then add 14% of the total mass of the mixed oil of Brazil palm wax and 0.3% of the total mass of the mixed oil of silicon dioxide, get modifier;

[0184] Select several healthy wisteria, cut the stems, placed in the drying oven at 60℃ temperature drying to moisture content 8%, finally immersed in the modifier, at 100℃ temperature for 5h, again placed in the temperature 20℃, humidity 65% constant temperature and humidity box to adjust to the equilibrium moisture content, get modified rattan;

[0185] (5) Hardening of rattan

[0186] The modified rattan is placed in an electric heating constant temperature drying oven and dried at 105℃ for 24h, and then cut into long fibers with a diameter of 4mm, and then treated by plying and twisting with a plying and twisting machine, the ply number of the plying yarn is 24, the twisting factor is 400, and the twisting direction is S and Z, and then placed on a high-speed loom to weave into a rattan long fiber single-layer woven fabric, and then dried at 105℃ for 24h, and then four layers of the dried rattan long fiber single-layer woven fabric are stacked in a mold with a length, width and height of 244mm*50mm*5mm, and then placed in a hot press, and then hot-pressed at a temperature of 160℃ and a pressure of 5MPa for 5min to obtain a molded part, and finally sawn into a long strip-shaped test piece with a length, width and height of 244mm*10mm*2mm, that is, the hardened rattan;

[0187] (6) Combination of poplar veneer laminated wood and hardened rattan

[0188] The poplar veneer laminated wood is placed in an electric heating constant temperature drying oven and dried at 60℃ for 24h, and then three long grooves with a length of 244mm, a width of 10mm and a depth of 2mm are cut on the back of the dried poplar veneer laminated wood along the grain direction with a fine woodworking band saw, and the grooves are spaced 25cm apart, and then the hardened rattan is inserted into the cut grooves to make a bending-resistant veneer laminated wood;

[0189] (7) Preparation of phase change microcapsules

[0190] The non-ionic emulsifier OP-10 and sodium dodecyl benzene sulfonate SDBS are mixed in a mass ratio of 2:1 to prepare an emulsifier;

[0191] MA and MMA are mixed in a mass ratio of 1:1, 6% of the total volume of the emulsifier is added, and ultrasonic dispersion is performed for 30min to obtain a shell pre-emulsion;

[0192] MA, MMA and paraffin are mixed, 10% of the total volume of the emulsifier is added, the mass ratio of MA to MMA is 1:3, and the amount of paraffin added is 8% of the total mass of MA and MMA, the temperature is raised to 70℃ to liquefy the paraffin, and ultrasonic dispersion is performed to obtain a mixed liquid, 2% of the total mass of the mixed liquid is used as an initiator, the mixed liquid is heated to 85℃, half of the initiator is added, and constant temperature reaction is performed for 2h, then the temperature is cooled to 30℃, 75μm sieve is used for filtration, then the temperature is raised to 85℃, the remaining half of the initiator and 2.2% of the total volume of the shell pre-emulsion are gradually added within 2h, and constant temperature reaction is performed for another 2h, after the reaction is completed, the temperature is lowered to room temperature, 75μm sieve is used for filtration, and drying is performed in an oven at 600℃ for 24h to obtain phase change microcapsules;

[0193] (8) Coating of phase change microcapsules

[0194] The epoxy resin and ethylenediamine were mixed in a mass ratio of 1:2, 4% of the total mass of the two was added as phase change microcapsules, stirred for 3 min, coated on the surface of the bending-resistant laminated veneer lumber at a thickness of 20 μm, and finally air-dried for 24 h to obtain the modified bending-resistant laminated veneer lumber.

[0195] Example 8

[0196] Preparation of modified bending-resistant laminated veneer lumber

[0197] (1) Preparation of poplar veneer

[0198] A 200 mm diameter log was selected, immersed in a 40 wt% sodium silicate solution for 4 h, removed and washed clean with deionized water, and after the surface moisture was air-dried, placed in an electrically heated constant temperature air drying oven at a temperature of 103℃ and dried to a moisture content of 10%. Then, a rotary cutting machine was used to cut out poplar veneer with a length of 244 mm, a width of 122 mm, and a thickness of 4 mm. The poplar veneer was placed in a forced air drying oven at a temperature of 65℃ and dried to a moisture content of 9%. Then, it was placed in a constant temperature and humidity chamber at a temperature of 22℃ and a humidity of 60% to adjust to the equilibrium moisture content.

[0199] (2) Modification of poplar veneer

[0200] The wax was added to the mixture of tung oil, linseed oil, and sunflower seed oil in a mass ratio of 1:1:2 to obtain a modified agent. The modified agent was added to the mixture of tung oil, linseed oil, and sunflower seed oil in a mass ratio of 1:1:2 to obtain a modified agent.

[0201] (3) Preparation of poplar veneer laminated lumber

[0202] Five layers of modified poplar veneer were arranged in the grain direction, and polyamide adhesive film was laid between the modified poplar veneer. The assembly was placed in a hot press, set at a temperature of 140℃ and a pressure of 1.2 MPa, and hot-pressed for 18 min. Then, it was placed in a cold press, set at a temperature of 26℃ and a pressure of 1.1 MPa, and cold-pressed for 10 min to obtain poplar veneer laminated lumber.

[0203] (4) Modification of rattan

[0204] The wax was added to the mixture of tung oil, linseed oil, and sunflower seed oil in a mass ratio of 1:1:2 to obtain a modified agent. The modified agent was added to the mixture of tung oil, linseed oil, and sunflower seed oil in a mass ratio of 1:1:2 to obtain a modified agent.

[0205] Select several healthy growth of kudzu, cut off the stems, placed in the air drying oven at 65℃ temperature drying to moisture content of 9%, finally immersed in the modifier, at 150℃ temperature for 4h, then placed in the temperature 21℃, humidity 65% constant temperature and humidity box to adjust to the equilibrium moisture content, get modified rattan;

[0206] (5) Hardening of the rattan

[0207] The modified rattan is placed in the electric heating constant temperature air drying oven at 104℃ temperature for 24h, then cut into 5mm diameter long fibers, and then treated by doubling and twisting with a doubling and twisting machine, the doubling thread count range is 30, the twisting factor range is 450, and the twisting direction is S, Z. Then it is placed on a high-speed walking horse weaving machine to weave into a single-layer woven fabric of rattan long fibers, and then dried at 104℃ temperature for 24h. Then three layers of dried single-layer woven fabric of rattan long fibers are stacked in a mold with a length, width and height of 244mm x 50mm x 5mm, and then placed in a hot press at a temperature of 150℃ and a pressure of 3MPa for 8min to obtain a molded part. Finally, it is sawn into a long strip-shaped test piece with a length, width and height of 244mm x 10mm x 2mm, which is the hardened rattan.

[0208] (6) Combination of poplar laminated veneer lumber and hardened rattan

[0209] The poplar laminated veneer lumber is placed in the electric heating constant temperature air drying oven at 60℃ temperature for 24h. Three long grooves with a length of 244mm, a width of 10mm and a depth of 2mm are cut on the back of the dried poplar laminated veneer lumber along the grain direction using a fine woodworking band saw. The grooves are spaced 25cm apart. The hardened rattan is inserted into the cut grooves to make a bending-resistant laminated veneer lumber.

[0210] (7) Preparation of phase change microcapsules

[0211] The non-ionic emulsifier OP-10 and sodium dodecyl benzene sulfonate SDBS are mixed in a mass ratio of 2:1 to prepare an emulsifier.

[0212] MA and MMA are mixed in a mass ratio of 1:1, and 2% of the total volume of emulsifier is added. Ultrasonic dispersion is performed for 30min to obtain a shell pre-emulsion.

[0213] The MA, MMA and paraffin were mixed, 10% of the total volume of the three was added with emulsifier, the mass ratio of MA to MMA was 3:7, the amount of paraffin was 9% of the total mass of MA and MMA, the temperature was raised to 70℃ to liquefy the paraffin, and then ultrasonic dispersion was carried out to obtain a mixed solution, 0.5% of the total mass of the mixed solution was added with sodium persulfate as initiator, the mixed solution was heated to 80℃, half of the initiator was added, and then constant temperature reaction was carried out for 1h, then it was cooled to 30℃, 75μm screen filter was used, then it was heated to 80℃, the remaining half of the initiator and 2.4% of the total volume of the mixed solution were gradually added with shell pre-emulsion, and then constant temperature reaction was carried out for 2h, after the reaction was completed, it was cooled to room temperature, 75μm screen filter was used, and then it was dried in an oven at 600℃ for 24h to obtain phase change microcapsules;

[0214] (8) Coating of phase change microcapsules

[0215] The epoxy resin and ethylenediamine were mixed in a mass ratio of 1:2, 4% of the total mass of the two was added with phase change microcapsules, stirring was carried out for 3min, and then it was coated on the surface of the bending-resistant laminated wood veneer with a thickness of 20μm, and finally it was dried for 24h to obtain modified bending-resistant laminated wood veneer.

[0216] Performance test:

[0217] The poplar laminated wood veneer, hardened rattan, and modified bending-resistant laminated wood veneer prepared in the above examples 1-8 were tested for various physical and mechanical properties and antibacterial properties, wherein the modulus of elasticity in bending and the static bending strength were determined according to the national standard GB / T T17657-2013, the horizontal shear strength was determined according to the national standard GB / T20241-2021, the lateral compression strength was determined according to the national standard GB / T T 1939-2009, and the antibacterial rate was determined according to the national standard GB / T 31402-2015.

[0218] Time for temperature to drop to room temperature at 60℃ (s): the sample was placed in an oven at 60℃ for 30min, and then it was taken out and kept on a precision graphite hot plate (LCS-35plus) for heat preservation, the temperature of the surface of the laminated wood veneer was tested and recorded every 3s until it cooled to 25℃.

[0219] The test results are shown in Tables 2-5.

[0220] Table 2: Performance test results of rattan stem

[0221]

[0222] Table 3: Performance test results of hardened rattan

[0223]

[0224] Table 4: Performance test results of poplar laminated wood veneer

[0225]

[0226] Table 5 Performance test results of modified bending-resistant laminated wood veneer

[0227]

[0228] The phase change microcapsule embedding rate and particle size of the phase change microcapsules prepared in the above Examples 1 to 8 were measured, and in order to compare the influence of the phase change microcapsules on the material cooling performance, the 60℃ drop to room temperature time test was performed on the bending-resistant laminated wood veneer (A) and the modified bending-resistant laminated wood veneer (B), respectively, and the results are shown in Table 6.

[0229] Table 6 Properties of phase change microcapsules

[0230]

[0231] The above description is merely preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for producing a bending-resistant laminated wood veneer, characterized by, Includes the following steps: (1) Preparation of poplar veneer Poplar logs are soaked in sodium silicate solution for impregnation, dried, and then poplar veneers are cut out. The poplar veneers are then dried and placed in a constant temperature and humidity chamber to adjust to the equilibrium moisture content. (2) Modification of poplar veneer Modified poplar veneer is obtained by immersing poplar veneer in vegetable oil after adjusting it to the equilibrium moisture content. (3) Preparation of poplar veneer laminated lumber Modified poplar veneers are assembled along the grain and hot-pressed to obtain poplar veneer laminated lumber. (4) Modification of rattan After drying the rattan, the rattan is heat-treated with a modifier and then placed in a constant temperature and humidity chamber to adjust to the equilibrium moisture content, thus obtaining the modified rattan. The specific process of heat treatment of the modifier is as follows: Tung oil, linseed oil and sunflower seed oil are mixed in a mass ratio of 1:1:1 to 3 to form a mixed oil. Then, 10 to 20% of carnauba wax and 0.1 to 0.5% of silica are added to the total mass of the mixed oil to obtain the modifier. The rattan is immersed in the modifier and soaked at 100 to 200°C for 3 to 5 hours. (5) Hardening of rattan Modified rattan is ground into powder and then cured with a curing agent, or cut into long fibers, woven together, and then cured by hot pressing to obtain hardened rattan. The specific process of grinding modified rattan into powder and then curing it with a curing agent is as follows: Grind the modified rattan into powder, pass it through a 40-60 mesh sieve, dry it at 103-105℃ for 24 hours, then mix it with maleic anhydride grafted polyethylene at a mass ratio of 1-3:1, feed it into a twin-screw extruder, and extrude and granulate it under the conditions of temperature 200-250℃, speed 140-160 r / min, and torque ratio 61-65%. After the extruded granules are crushed, they are placed in a mold and hot-pressed at a temperature of 130-150℃ and a pressure of 5-7MPa for 10-15 minutes to obtain the molded parts, and finally saw them into long strips. The specific process of cutting modified rattan into long fibers and then curing it by hot pressing is as follows: the modified rattan is dried at 103-105℃ for 24 hours, then cut into long fibers with a diameter of 2-5mm, and twisted using a twisting machine. After that, it is placed on a high-speed twill weaving machine to weave a single layer of rattan long fiber woven fabric, and then dried at 103-105℃ for 24 hours. The dried rattan long fiber single layer woven fabric is then laid in a mold and hot-pressed at 140-160℃ and 3-5MPa for 5-10 minutes to obtain the molded part. Finally, it is cut into long strips. (6) Combination of poplar veneer laminated lumber and hardened rattan Grooves are made in poplar veneer laminated timber, and hardened rattan is inserted into the grooves in the poplar veneer laminated timber to obtain the bending resistant veneer laminated timber.

2. The method of producing a bending-resistant laminated wood veneer according to claim 1, wherein In step (1), the concentration of sodium silicate solution is 10-40 wt%, the soaking time is 3-5 h, the drying temperature of poplar logs is 103-105 ℃, and the moisture content is 10-15%. The drying temperature of poplar veneer is 60-65 ℃, and the moisture content is 8-10%. The temperature of the constant temperature and humidity chamber is 20-22 ℃ and the humidity is 60-70%.

3. The method of producing a bending-resistant laminated wood veneer according to claim 1, wherein In step (2), the specific process of the impregnation treatment is as follows: the plant oil is selected from silk gourd seed oil, rose essential oil or lemon essential oil, the plant oil is mixed with dichloromethane at a volume ratio of 1:1-3, stirred at 30℃ for 60-80 min, and then an antibacterial plant oil is obtained; the poplar single board is placed in a modified tank, the antibacterial plant oil is pumped into the modified tank after sealing, the pressure in the modified tank is increased to 0.8-1.2 MPa, and the pressure is maintained for 10-15 min, then the poplar single board is taken out, and the poplar single board is stored at room temperature for 24 h, and finally dried to a moisture content of 8-10%.

4. The method of producing a bending-resistant laminated wood veneer according to claim 1, wherein In step (3), the specific process of the hot pressing and gluing treatment is as follows: the adhesive film is selected from polyamide adhesive film, polyvinyl chloride adhesive film or vinyl acetate copolymer adhesive film, and then hot pressing is performed at a temperature of 140-160℃ and a pressure of 0.8-1.2 MPa for 0.8-1.2 min / mm, followed by cold pressing at a temperature of 20-30℃ and a pressure of 0.8-1.2 MPa for 10-20 min.

5. The method of making a flexible veneer laminated object according to claim 1, wherein, In step (4), the specific process of the drying treatment is as follows: the green tea canes are dried at a temperature of 60-65℃ until the moisture content is 8-10%; the temperature and humidity of the constant temperature and humidity box are 20-22℃ and 60-70%, respectively.

6. A method for producing a modified bending-resistant laminated wood veneer, characterized by The method comprises the following steps: The phase change microcapsules, the curing agent and the thermoplastic resin are mixed, and then coated on the surface of the bending-resistant single board laminated material prepared by the preparation method according to any one of claims 1 to 5, and then dried to obtain the modified bending-resistant single board laminated material.

7. The method of producing a modified bending-resistant veneer laminated wood product according to claim 6, wherein The preparation method of the phase change microcapsules is as follows: a. Methyl acrylate and methyl methacrylate are mixed at a mass ratio of 1-3:1, 0.5-10% of the total volume of the emulsifier is added, and ultrasonic dispersion is performed to obtain a shell pre-emulsion; b. Methyl acrylate, methyl methacrylate and paraffin are mixed, 0.5-10% of the total volume of the emulsifier is added, the mass ratio of methyl acrylate to methyl methacrylate is 1:2-3, the addition amount of paraffin is 6-10% of the total mass of methyl acrylate and methyl methacrylate, the temperature is increased to 60-70℃ to liquefy the paraffin, ultrasonic dispersion is performed, a mixed solution is obtained, 0.1-2% of sodium persulfate based on the total mass of the mixed solution is used as an initiator, the mixed solution is heated to 80-90℃, half of the initiator is added, constant temperature reaction is performed for 1-2 h, then the temperature is cooled to 30-40℃, filtration treatment is performed, then the temperature is increased to 80-90℃, the remaining half of the initiator and 2-2.8% of the shell pre-emulsion based on the total volume of the mixed solution are added within 2-3 h, and then constant temperature reaction is performed for 1-2 h, the reaction is completed, the temperature is reduced to room temperature, filtration treatment is performed, and drying is performed in an oven at 600℃ for 24 h to obtain the phase change microcapsules.

8. The method for preparing the modified flexural laminated veneer lumber as described in claim 7, characterized in that, The emulsifier is a mixture of OP-10 and sodium dodecyl benzene sulfonate at a mass ratio of 2-4:1.

Images