Plywood with insect prevention effect and preparation method thereof
Through steam treatment and soaking of insect-proof agent solution, combining glue and hot pressing treatment, and applying flame retardant, the problem of insufficient insect-proof and flame retardant performance of plywood is solved, and efficient insect-proof and flame retardant effects are achieved.
Patent Information
- Application Number
- CN202411966177.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-03-21
AI Technical Summary
The existing plywood has poor insect-proof effect and flame retardant properties, making it difficult to effectively prevent termites and silverworms from invading. At the same time, there is a risk of damage to the treatment of wood fibers.
After steaming the log veneer, it is placed in a insect-proofing solution and soaked, dried and glued and hot pressed, and a flame retardant is applied to form a plywood with insect-proof and flame retardant effects.
The excellent insect-proof performance, flame retardant performance and glue properties of plywood are achieved, and the additives used are harmless to the human body and the environment.
Smart Images
Figure BDA0005218399960000091 
Figure BDA0005218399960000101
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of plywood preparation, and in particular to a plywood with insect-proof effect and a preparation method thereof. Background Art
[0002] Termites feed on wood and will constantly gnaw on the inside of the wood, causing structural damage to the wood. Long-term damage can cause damage to the structure of the house, deformation of furniture, and the decay of books and paper. Termites will build nests and reproduce inside the wood, and secrete acidic substances to corrode the wood, further exacerbating the damage to the wood, causing huge economic losses to housing and crops. Woodworms will convert wood into fine powder, and woodworm larvae usually excrete a large amount of powder when harming wood. Although the adult insects are harmless, they will continue to reproduce. It can be seen that termites and woodworms are extremely harmful to wood, and a variety of prevention and control measures need to be taken to protect wooden structures and furniture from damage.
[0003] As one of the common materials for furniture, plywood is deeply harmed by termites, bark beetles and other insects. In this regard, patent CN114932603A discloses a method for preparing insect-proof plywood, which comprises immersing a veneer in a hydrogen peroxide treatment solution, taking it out and drying it, applying the insect-proof coating solution on the surface of the veneer by brushing or spraying, drying it naturally, and then applying a cypermethrin-containing adhesive, forming an embryo, and pressing it to obtain an insect-proof plywood. However, when the veneer is immersed in hydrogen peroxide, the prior art is likely to cause a certain degree of damage to the wood fiber in the veneer, and the melamine-modified urea-formaldehyde resin adhesive used in the veneer has improved waterproofness and stability.
[0004] Therefore, it is of great significance to study and obtain an environmentally friendly, harmless, insect-proof and flame-retardant plywood and a preparation method thereof. Summary of the invention
[0005] The object of the present invention is to provide a plywood with insect-proof effect and a preparation method thereof, so as to solve the problem that the plywood prepared in the prior art has poor insect-proof effect and flame retardant performance.
[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:
[0007] The present invention provides a method for preparing a plywood with an insect-proof effect, comprising the following steps:
[0008] 1) Steaming the log veneer to obtain a pretreated veneer;
[0009] 2) soaking the obtained pretreated veneer in an insect repellent solution and drying the veneer to obtain a veneer;
[0010] 3) coating one surface of the obtained veneer with glue, and gluing the obtained veneer with glue to obtain a wood board blank;
[0011] 4) hot-pressing the obtained wood blank and coating it with a flame retardant to obtain a plywood;
[0012] In the step 2), the insect repellent solution comprises an insect repellent component, ramie oil, phosphoric acid, polyethylene glycol, quaternary ammonium copper and water.
[0013] Preferably, in step 1), the log veneer is obtained by peeling wood; the wood is fir, poplar or birch; the thickness of the log veneer is 1 to 1.5 mm.
[0014] Preferably, in step 1), the steaming treatment is to place the log veneer in saturated steam for steaming, the steaming temperature is 100-110° C., and the steaming time is 30-60 min.
[0015] Preferably, in step 2), the insect repellent solution comprises the following components in parts by weight: 0.5-5 parts of insecticide component, 1-3 parts of ramie oil, 1-3 parts of phosphoric acid, 5-8 parts of polyethylene glycol, 0.1-2 parts of quaternary ammonium copper, and 80-100 parts of water;
[0016] The insect-proof components include two or more of permethrin, deltamethrin, lambda-cyhalothrin, cypermethrin, bifenthrin, imidacloprid, thiacloprid and S-cypermethrin.
[0017] Preferably, in the step 2), the soaking time is 1 to 2 hours, the drying is natural drying, and the water content of the veneer is 13 to 15 wt%.
[0018] Preferably, in step 3), the glue used for coating comprises the following components in parts by weight: 18 to 25 parts of butyl acrylate, 6 to 10 parts of acrylic acid, 0.8 to 1.2 parts of methacrylic acid, 0.6 to 1.2 parts of sodium dodecylbenzene sulfonate, 0.1 to 0.4 parts of ammonium persulfate and 10 to 18 parts of glacial acetic acid.
[0019] Preferably, in step 3), the gluing is carried out in a staggered arrangement horizontally and vertically according to the single board texture, and the number of layers of the wood board blank is 3 to 5 layers.
[0020] Preferably, in step 4), the temperature of hot pressing is 110-120° C., the pressure of hot pressing is 2-3 MPa, the number of hot pressing is 3-5 times, and the time of each hot pressing is 3-6 minutes.
[0021] Preferably, in step 4), the flame retardant comprises the following components in parts by weight: 20-30 parts of phytic acid, 18-22 parts of magnesium sulfate, 1-10 parts of graphite oxide, and 40-70 parts of water; the drying is ventilation drying, and the drying time is 5-7 hours.
[0022] The present invention also provides a plywood with an insect-proof effect prepared by the method for preparing the plywood with an insect-proof effect.
[0023] It can be seen from the above technical solutions that, compared with the prior art, the present invention has the following beneficial effects:
[0024] The auxiliary agent used in the preparation method of the plywood of the present invention does not contain any substance harmful to human body and environment, and the prepared plywood has excellent insect-proof performance, flame-retardant performance and gluing performance. DETAILED DESCRIPTION
[0025] The present invention provides a method for preparing a plywood with an insect-proof effect, comprising the following steps:
[0026] 1) Steaming the log veneer to obtain a pretreated veneer;
[0027] 2) soaking the obtained pretreated veneer in an insect repellent solution and drying the veneer to obtain a veneer;
[0028] 3) coating one surface of the obtained veneer with glue, and gluing the obtained veneer with glue to obtain a wood board blank;
[0029] 4) The obtained wood board is hot-pressed and then coated with a flame retardant to obtain a plywood.
[0030] In the present invention, in the step 1), the log veneer is preferably obtained by peeling wood; the wood is preferably fir, poplar or birch; the thickness of the log veneer is preferably 1-1.5 mm, more preferably 1.1-1.4 mm, and more preferably 1.2-1.3 mm.
[0031] In the present invention, in the step 1), the steaming treatment is preferably to place the log veneer in saturated steam for steaming, the steaming temperature is preferably 100-110°C, more preferably 102-108°C, more preferably 104-106°C, the steaming time is preferably 30-60min, more preferably 35-55min, more preferably 40-50min.
[0032] In the present invention, the steaming treatment is preferably carried out in a steam kiln, and after the steaming treatment, the kiln is preferably cooled, and the cooling temperature is preferably 20-30°C, more preferably 22-28°C, and more preferably 24-26°C.
[0033] In the present invention, the steaming treatment uses high-temperature steam as a heat source for killing pests. The high-temperature steam can reach the core of the log veneer and kill the pests in the core of the log veneer, with significant effect.
[0034] In the present invention, the steaming treatment is carried out in a high humidity environment to avoid cracking of the log veneer.
[0035] In the present invention, in the step 2), the insect repellent solution comprises the following components in parts by weight: 0.5-5 parts of insect repellent component, 1-3 parts of ramie oil, 1-3 parts of phosphoric acid, 5-8 parts of polyethylene glycol, 0.1-2 parts of quaternary ammonium copper, and 80-100 parts of water; the mass fraction of the insect repellent component is preferably 1-4.5 parts, more preferably 1.5-4 parts, and more preferably 2-3 parts, the mass fraction of the ramie oil is preferably 1.5-2.5 parts, more preferably 2 parts, and the phosphoric acid is preferably 0.5-1.5 parts. The mass fraction of is preferably 1.2 to 2.8 parts, more preferably 1.6 to 2.4 parts, more preferably 2 to 2.2 parts, the mass fraction of the polyethylene glycol is preferably 5.5 to 7.5 parts, more preferably 6 to 7 parts, more preferably 6.5 parts, the mass fraction of the quaternary ammonium copper is preferably 0.3 to 1.6 parts, more preferably 0.5 to 1.2 parts, more preferably 0.8 to 1 parts, the mass fraction of the water is preferably 85 to 95 parts, more preferably 90 parts;
[0036] The insect-proof components include two or more of permethrin, deltamethrin, lambda-cyhalothrin, cypermethrin, bifenthrin, imidacloprid, thiacloprid and S-cypermethrin.
[0037] In the present invention, the preparation method of the insect repellent solution is as follows: phosphoric acid is mixed with water to obtain a phosphoric acid solution, the phosphoric acid solution is heated, an insect repellent component, ramie oil and quaternary ammonium copper are sequentially added and stirred, polyethylene glycol is added, and the mixture is uniformly mixed to obtain the insect repellent solution; the heating temperature is preferably 30 to 60° C., more preferably 35 to 55° C., more preferably 40 to 45° C., and the stirring time is preferably 15 to 25 min, more preferably 17 to 23 min, and more preferably 20 to 22 min.
[0038] In the present invention, the quaternary ammonium copper acts as a mildew preventer and has a certain insect-proof effect; the ramie oil can act on the nervous system of insects to produce paralysis and disorder effects, thereby cooperating with the insect-proof component to achieve the purpose of insect-proofing; the added polyethylene glycol enhances the penetration effect of the insect-proof agent solution in the single board, facilitates the single board to adsorb the insect-proof agent solution, and makes the single board have insect-proof and mildew-proof properties.
[0039] In the present invention, in the step 2), the soaking time is preferably 1 to 2 hours, more preferably 1.5 hours, the drying is preferably natural drying, and the water content of the veneer is preferably 13 to 15wt%, more preferably 13.5 to 14.5wt%, and more preferably 14wt%.
[0040] In the present invention, in the step 3), the glue used for coating comprises the following components in parts by weight: 18 to 25 parts of butyl acrylate, 6 to 10 parts of acrylic acid, 0.8 to 1.2 parts of methacrylic acid, 0.6 to 1.2 parts of sodium dodecylbenzene sulfonate, 0.1 to 0.4 parts of ammonium persulfate and 10 to 18 parts of glacial acetic acid; the mass fraction of the butyl acrylate is preferably 19 to 24 parts, more preferably 20 to 23 parts, and more preferably 21 to 22 parts, the mass fraction of the acrylic acid is preferably 7 to 9 parts, more preferably 8 parts, the mass fraction of the methacrylic acid is preferably 0.9 to 1.1 parts, and more preferably 1 part, the mass fraction of the sodium dodecylbenzene sulfonate is preferably 0.7 to 1.1 parts, more preferably 0.8 to 1 parts, and more preferably 0.9 parts, the mass fraction of the ammonium persulfate is preferably 0.2 to 0.3 parts, and the mass fraction of the glacial acetic acid is preferably 11 to 17 parts, more preferably 12 to 16 parts, and more preferably 14 to 15 parts.
[0041] In the present invention, the preparation step of the glue solution is: after mixing butyl acrylate, methacrylic acid and acrylic acid, sodium dodecylbenzene sulfonate, ammonium persulfate and glacial acetic acid are added in sequence and stirred; the mixing temperature is preferably 70-90°C, more preferably 74-86°C, more preferably 78-82°C, the mixing time is preferably 30-50min, more preferably 34-47min, more preferably 38-45min, the stirring temperature is preferably 70-90°C, more preferably 74-86°C, more preferably 78-82°C, the stirring time is preferably 10-20min, more preferably 12-18min, more preferably 15-16min.
[0042] In the present invention, in step 3), the amount of glue applied on the single surface is preferably 80 to 150 g / m 2 , more preferably 90 to 130 g / m 2 , more preferably 100 to 120 g / m 2 .
[0043] In the present invention, in the step 3), the gluing is preferably arranged in a staggered manner horizontally and vertically according to the veneer texture, and the number of layers of the wood board is preferably 3 to 5 layers, and more preferably 4 layers.
[0044] In the present invention, in the step 4), the temperature of hot pressing is preferably 110-120°C, more preferably 112-118°C, more preferably 114-116°C, the pressure of hot pressing is preferably 2-3MPa, more preferably 2.2-2.8MPa, more preferably 2.4-2.6MPa, the number of hot pressing is preferably 3-5 times, more preferably 4 times, and the time of each hot pressing is preferably 3-6min, more preferably 4-5min.
[0045] In the present invention, in step 4), cooling is preferably performed after hot pressing, and the cooling temperature is preferably 20 to 30°C, more preferably 22 to 28°C, and even more preferably 25 to 26°C.
[0046] In the present invention, in the step 4), the flame retardant includes the following components in parts by weight: 20 to 30 parts of phytic acid, 18 to 22 parts of magnesium sulfate, 1 to 10 parts of graphite oxide, and 40 to 70 parts of water; the mass fraction of the phytic acid is preferably 22 to 28 parts, more preferably 24 to 26 parts, and more preferably 25 parts, the mass fraction of the magnesium sulfate is preferably 19 to 21 parts, and more preferably 20 parts, the mass fraction of the graphite oxide is preferably 2 to 8 parts, and more preferably 3 to 7 parts, and more preferably 4 to 5 parts, the mass fraction of the water is preferably 45 to 65 parts, and more preferably 50 to 60 parts, and more preferably 55 parts; the drying is preferably ventilation drying, and the drying time is preferably 5 to 7 hours, and more preferably 5.5 to 6.5 hours, and more preferably 6 hours.
[0047] In the present invention, the preparation method of the flame retardant is: mixing phytic acid, magnesium sulfate, graphite oxide and water; the mixing temperature is preferably 30-50°C, more preferably 35-45°C, more preferably 40-42°C, and the mixing time is preferably 10-15min, more preferably 11-14min, more preferably 12-13min.
[0048] In the present invention, in the step 4), the flame retardant is preferably applied before drying, and the drying is preferably natural air drying.
[0049] In the present invention, in the step 4), the coating thickness of the flame retardant is preferably 1 to 4 mm, more preferably 1.5 to 3 mm, and even more preferably 2 to 2.5 mm.
[0050] The present invention also provides a plywood with an insect-proof effect prepared by the method for preparing the plywood with an insect-proof effect.
[0051] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.
[0052] Example 1
[0053] In this embodiment, the raw materials of the insect repellent solution include: 1.6 parts of S-cypermethrin, 1.9 parts of bifenthrin, 2 parts of ramie oil, 2 parts of phosphoric acid crystals, 6 parts of polyethylene glycol, 0.7 parts of quaternary ammonium copper, and 90 parts of water; the preparation steps of the insect repellent solution are as follows: phosphoric acid and water are mixed to obtain a phosphoric acid solution, the phosphoric acid solution is heated to 55° C., S-cypermethrin, bifenthrin, ramie oil and quaternary ammonium copper are added in sequence and stirred for 15 minutes, and then polyethylene glycol is added to obtain the insect repellent solution.
[0054] The raw materials of the glue solution include: 22 parts of butyl acrylate, 8 parts of acrylic acid, 1 part of methacrylic acid, 0.8 parts of sodium dodecylbenzene sulfonate, 0.3 parts of ammonium persulfate and 16 parts of glacial acetic acid (concentration is 98%); the preparation steps of the glue solution are as follows: butyl acrylate, methacrylic acid and acrylic acid are mixed at 80° C. for 45 minutes, and then sodium dodecylbenzene sulfonate, ammonium persulfate and glacial acetic acid are added in sequence and stirred at 80° C. for 15 minutes to obtain the glue solution;
[0055] The raw materials of the flame retardant include: 26 parts of phytic acid, 20 parts of magnesium sulfate, 8 parts of graphite oxide, and 50 parts of water; the preparation steps of the flame retardant are as follows: phytic acid, magnesium sulfate, graphite oxide and water are mixed at 45° C. for 12 minutes to obtain the flame retardant.
[0056] The fir wood is peeled to obtain a log veneer with a thickness of 1.2 mm, and the obtained log veneer is placed in a steam kiln at a temperature of 105°C and a humidity of 100% for 40 minutes, and after the steaming is completed, it is cooled to 25°C in the kiln to obtain a pre-treated veneer;
[0057] The obtained pretreated veneer is placed in an insect repellent solution and soaked for 1 hour, then taken out and naturally dried until the water content of the pretreated veneer is 14 wt %, to obtain a veneer;
[0058] Take 4 veneers and apply glue on one side of the veneer (the amount of glue applied is 120g / m 2 ), and then gluing them according to the crisscross arrangement of the veneer texture to obtain a wood board blank with 4 veneer layers;
[0059] The obtained wood board was hot pressed at a temperature of 115°C under a pressure of 2.2MPa, and the hot pressing was repeated 4 times, each time for 5 minutes. After the hot pressing was completed, it was naturally cooled to 25°C and coated with a 1.5mm thick flame retardant. After natural air drying, the plywood was obtained.
[0060] Example 2
[0061] In this embodiment, the raw materials of the insect repellent solution include: 2 parts of permethrin, 2 parts of bifenthrin, 2.2 parts of ramie oil, 2.4 parts of phosphoric acid crystals, 7 parts of polyethylene glycol, 1.3 parts of quaternary ammonium copper, and 100 parts of water; the preparation steps of the insect repellent solution are as follows: phosphoric acid and water are mixed to obtain a phosphoric acid solution, the phosphoric acid solution is heated to 45°C, permethrin, bifenthrin, ramie oil and quaternary ammonium copper are added in sequence and stirred for 20 minutes, and then polyethylene glycol is added and mixed evenly to obtain the insect repellent solution.
[0062] The raw materials of the glue solution include: 24 parts of butyl acrylate, 10 parts of acrylic acid, 1.2 parts of methacrylic acid, 1 part of sodium dodecylbenzene sulfonate, 0.4 parts of ammonium persulfate and 14 parts of glacial acetic acid (concentration is 98%); the preparation steps of the glue solution are as follows: butyl acrylate, methacrylic acid and acrylic acid are mixed at 85° C. for 40 minutes, and then sodium dodecylbenzene sulfonate, ammonium persulfate and glacial acetic acid are added in sequence and stirred at 85° C. for 18 minutes to obtain the glue solution;
[0063] The raw materials of the flame retardant include: 28 parts of phytic acid, 22 parts of magnesium sulfate, 10 parts of graphite oxide, and 60 parts of water; the preparation steps of the flame retardant are as follows: phytic acid, magnesium sulfate, graphite oxide and water are mixed at 45° C. for 15 minutes to obtain the flame retardant.
[0064] The fir wood is peeled to obtain a log veneer with a thickness of 1.2 mm, and the obtained log veneer is placed in a steam kiln at a temperature of 100° C. and a humidity of 100% for steaming for 50 minutes, and after the steaming is completed, it is cooled to 25° C. in the kiln to obtain a pretreated veneer;
[0065] The obtained pretreated veneer is placed in an insect repellent solution and soaked for 1.5 hours, then taken out and naturally dried until the water content of the pretreated veneer is 13 wt %, to obtain a veneer;
[0066] Take 4 veneers and apply glue on one side of the veneer (the glue coating amount is 110g / m 2 ), and then gluing them according to the crisscross arrangement of the veneer texture to obtain a wood board blank with 4 veneer layers;
[0067] The obtained wood board blank was hot pressed at a temperature of 120°C under a pressure of 2.6MPa, and the hot pressing was repeated 5 times, each time for 3 minutes. After the hot pressing was completed, it was naturally cooled to 25°C and coated with a 2mm thick flame retardant. After natural air drying, the plywood was obtained.
[0068] Example 3
[0069] In this embodiment, the raw materials of the insect repellent solution include: 1.4 parts of permethrin, 2.5 parts of imidacloprid, 1.3 parts of ramie oil, 1.6 parts of phosphoric acid crystals, 5 parts of polyethylene glycol, 0.4 parts of quaternary ammonium copper, and 80 parts of water; the preparation steps of the insect repellent solution are as follows: phosphoric acid and water are mixed to obtain a phosphoric acid solution, the phosphoric acid solution is heated to 35° C., permethrin, imidacloprid, ramie oil and quaternary ammonium copper are added in sequence and stirred for 15 minutes, and then polyethylene glycol is added, and the mixture is mixed evenly to obtain the insect repellent solution.
[0070] The raw materials of the glue solution include: 18 parts of butyl acrylate, 6 parts of acrylic acid, 0.8 parts of methacrylic acid, 0.6 parts of sodium dodecylbenzene sulfonate, 0.1 parts of ammonium persulfate and 10 parts of glacial acetic acid (concentration of 98%); the preparation steps of the glue solution are as follows: butyl acrylate, methacrylic acid and acrylic acid are mixed at 70° C. for 50 minutes, and then sodium dodecylbenzene sulfonate, ammonium persulfate and glacial acetic acid are added in sequence and stirred at 70° C. for 12 minutes to obtain the glue solution;
[0071] The raw materials of the flame retardant include: 22 parts of phytic acid, 18 parts of magnesium sulfate, 4 parts of graphite oxide, and 40 parts of water; the preparation steps of the flame retardant are as follows: phytic acid, magnesium sulfate, graphite oxide and water are mixed at 30° C. for 10 minutes to obtain the flame retardant.
[0072] The fir wood is peeled to obtain a log veneer with a thickness of 1.2 mm, and the obtained log veneer is placed in a steam kiln at a temperature of 110° C. and a humidity of 100% for steaming for 35 minutes, and after the steaming is completed, it is cooled to 25° C. in the kiln to obtain a pretreated veneer;
[0073] The obtained pretreated veneer is placed in an insect repellent solution and soaked for 2 hours, then taken out and naturally dried until the water content of the pretreated veneer is 15 wt %, to obtain a veneer;
[0074] Take 4 veneers and apply glue on one side of the veneer (the glue amount is 135g / m 2 ), and then gluing them according to the crisscross arrangement of the veneer texture to obtain a wood board blank with 4 veneer layers;
[0075] The obtained wood board was hot pressed at a temperature of 112°C under a pressure of 2.6MPa, and the hot pressing was repeated 5 times, each time for 4 minutes. After the hot pressing was completed, it was naturally cooled to 25°C and coated with a 2.5mm thick flame retardant. After natural air drying, the plywood was obtained.
[0076] Comparative Example 1
[0077] The raw materials of the insect repellent solution in Example 1 are modified to "3.5 parts of boric acid, 17.5 parts of cypermethrin, 5 parts of sodium dodecylbenzene sulfonate and 100 parts of water", and the other steps are the same as Example 1.
[0078] Comparative Example 2
[0079] The "ramie oil" in the raw material of the insect repellent solution in Example 1 is omitted, and the other steps are the same as in Example 1.
[0080] Comparative Example 3
[0081] The "bifenthrin" in the raw materials of the insect repellent solution in Example 1 is omitted, and the other steps are the same as in Example 1.
[0082] Comparative Example 4
[0083] The raw material of the glue solution in Example 1 is changed to "melamine resin adhesive", and the other steps are the same as Example 1.
[0084] Comparative Example 5
[0085] The raw materials of the flame retardant in Example 1 were modified to "12 parts of phytic acid, 20 parts of magnesium sulfate, 8 parts of graphite oxide, and 50 parts of water", and the other steps were the same as in Example 1.
[0086] Performance Test:
[0087] Bonding strength: According to GB / T17657-1999 "Test methods for physical and chemical properties of wood-based panels and veneer wood-based panels", the bonding strength performance of the plywood prepared in Examples 1 to 3 and Comparative Examples 1 to 5 was tested, and the test results are shown in Table 1;
[0088] Insect repellent performance test:
[0089] Termites: The plywoods prepared in Examples 1 to 3 and Comparative Examples 1 to 5 were cut into samples of 50 mm × 50 mm in size, placed in a culture dish, and 30 termites were placed in the dish to observe the survival time of the termites. The test results are shown in Table 1;
[0090] Silverfish: The plywoods prepared in Examples 1 to 3 and Comparative Examples 1 to 5 were cut into samples of 50 mm × 50 mm in size, placed in a culture dish, and 30 silverfish were placed in the dish to observe the survival time of the silverfish. The test results are shown in Table 1.
[0091] Flame retardant performance test:
[0092] The flame retardant properties of the plywood obtained in Examples 1 to 3 and Comparative Examples 1 to 5 were tested using a cone calorimeter in accordance with international standard ISO5660-1-2002, with a radiation power of 50 kW / m 2 , the test results are shown in Table 1.
[0093] Table 1 Performance test results of plywood obtained from Examples 1 to 3 and Comparative Examples 1 to 5
[0094]
[0095]
[0096] It can be seen from Table 1 that the plywood obtained in Examples 1 to 3 has excellent bonding strength, insect repellent performance and flame retardancy; the components of the insect repellent solution in the technical solution of the present invention have a synergistic effect, and even if any component is changed, the corresponding insect repellent effect will be reduced.
[0097] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A method for preparing plywood with insect-proof effect, characterized in that: The steps include: 1) Steaming the log veneer to obtain a pretreated veneer; 2) soaking the obtained pretreated veneer in an insect repellent solution and drying the veneer to obtain a veneer; 3) coating one surface of the obtained veneer with glue, and gluing the obtained veneer with glue to obtain a wood board blank; 4) hot-pressing the obtained wood blank and coating it with a flame retardant to obtain a plywood; In the step 2), the insect repellent solution comprises an insect repellent component, ramie oil, phosphoric acid, polyethylene glycol, quaternary ammonium copper and water.
2. The method for preparing a plywood with insect-proof effect according to claim 1, characterized in that: In the step 1), the log veneer is obtained by peeling wood; the wood is fir, poplar or birch; the thickness of the log veneer is 1 to 1.5 mm.
3. The method for preparing a plywood with insect-proof effect according to claim 2, characterized in that: In the step 1), the steaming treatment is to place the log veneer in saturated steam for steaming, the steaming temperature is 100-110° C., and the steaming time is 30-60 minutes.
4. The method for preparing a plywood with insect-proof effect according to claim 1, characterized in that: In the step 2), the insect repellent solution comprises the following components in parts by weight: 0.5-5 parts of insect repellent component, 1-3 parts of ramie oil, 1-3 parts of phosphoric acid, 5-8 parts of polyethylene glycol, 0.1-2 parts of quaternary ammonium copper, and 80-100 parts of water; The insect-proof components include two or more of permethrin, deltamethrin, lambda-cyhalothrin, cypermethrin, bifenthrin, imidacloprid, thiacloprid and S-cypermethrin.
5. A method for preparing a plywood with insect-proof effect according to claim 1 or 4, characterized in that: In the step 2), the soaking time is 1 to 2 hours, the drying is natural drying, and the water content of the veneer is 13 to 15 wt %.
6. The method for preparing a plywood with insect-proof effect according to claim 5, characterized in that: In the step 3), the glue used for coating includes the following components in parts by weight: 18 to 25 parts of butyl acrylate, 6 to 10 parts of acrylic acid, 0.8 to 1.2 parts of methacrylic acid, 0.6 to 1.2 parts of sodium dodecylbenzene sulfonate, 0.1 to 0.4 parts of ammonium persulfate and 10 to 18 parts of glacial acetic acid.
7. A method for preparing plywood with insect-proof effect according to claim 6, characterized in that: In the step 3), the gluing is carried out in a staggered arrangement horizontally and vertically according to the single board texture, and the number of layers of the wood board blank is 3 to 5 layers.
8. The method for preparing a plywood with insect-proof effect according to claim 1, characterized in that: In the step 4), the temperature of hot pressing is 110-120° C., the pressure of hot pressing is 2-3 MPa, the number of hot pressing is 3-5 times, and the time of each hot pressing is 3-6 minutes.
9. The method for preparing a plywood with insect-proof effect according to claim 8, characterized in that: In the step 4), the flame retardant comprises the following components in parts by weight: 20-30 parts of phytic acid, 18-22 parts of magnesium sulfate, 1-10 parts of graphite oxide, and 40-70 parts of water; the drying is ventilation drying, and the drying time is 5-7 hours.
10. The plywood with insect-proof effect obtained by the method for preparing a plywood with insect-proof effect according to any one of claims 1 to 9.