A method for preventing deformation of a Chinese fir core ecological board

Abstract

The present invention provides a method for preventing deformation of a Chinese fir core ecological board, belonging to the technical field of wood boards. After the Chinese fir core ecological board is modified by a silane coupling agent, it is immersed in an aqueous dispersion of a water-absorbing and insect-proof nano-molecular sieve for 5-7 days, taken out and dried. After the Chinese fir core ecological board of the present invention is modified by a silane coupling agent, it promotes the uniform distribution and stable fixation of the water-absorbing and insect-proof nano-molecular sieve inside the Chinese fir core ecological board. It has rich pores, good water absorption performance, can release anti-insect and antibacterial active substances for a long time, and has good photocatalytic antibacterial, formaldehyde degradation, VOCs degradation and other characteristics, so that the treated Chinese fir core ecological board can remain unchanged for a long time, and is more environmentally friendly, safe and of better quality, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of wooden boards, and particularly relates to a method for preventing deformation of a Chinese fir core ecological board. Background Art

[0002] With the continuous improvement of living standards, people's requirements for the grade of furniture have gradually increased, and solid wood furniture is especially deeply loved by consumers. With the progress of technology, the connections between different parts of the world are getting closer and closer. Domestic solid wood furniture is sold well all over the world, which also brings technical problems to the solid wood furniture industry: If dried wooden boards are used, the shape change is small, but the drying process is slow and time-consuming. If freshly cut wooden boards are used to make furniture, they will be distorted and deformed. The water content on the convex surface of the annual ring is higher than that on the concave surface of the annual ring. The water on the convex surface of the annual ring loses quickly, while the water on the concave surface of the annual ring loses slowly, resulting in the convex surface of the annual ring shrinking quickly and pulling the concave surface of the annual ring to deform, leading to furniture deformation. At the same time, during the long-term use of wooden boards, it is inevitable to suffer from insect pests and cause decay and deformation. Summary of the Invention

[0003] The purpose of the present invention is to propose a method for preventing deformation of a Chinese fir core ecological board. After the Chinese fir core ecological board is modified by a silane coupling agent, the amino groups attached to it can form a stable complex with the water-absorbing and insect-proof nano-molecular sieve through hydrogen bonds and van der Waals forces, thereby promoting the uniform distribution and stable fixation of the water-absorbing and insect-proof nano-molecular sieve inside the Chinese fir core ecological board. The water-absorbing and insect-proof nano-molecular sieve has abundant pores and good water absorption performance. At the same time, it can continuously release anti-insect and antibacterial active substances, and has good characteristics such as photocatalytic antibacterial, formaldehyde degradation, and VOCs degradation. This makes the treated Chinese fir core ecological board able to remain unchanged for a long time, and is more environmentally friendly, safe, and of better quality, with broad application prospects.

[0004] The technical solution of the present invention is realized as follows:

[0005] The present invention provides a method for preventing deformation of a Chinese fir core ecological board. After the Chinese fir core ecological board is modified by a silane coupling agent, it is immersed in an aqueous dispersion of a water-absorbing and insect-proof nano-molecular sieve for 5 - 7 days, taken out, and dried.

[0006] As a further improvement of the present invention, the preparation method of the water-absorbing and insect-proof nano-molecular sieve is as follows:

[0007] S1. Preparation of the silicon-aluminum source solution: Dissolve an alkali in water, add sodium metasilicate, and stir to dissolve to obtain a silicon source solution; dissolve an alkali in water, add sodium aluminate, and stir to dissolve to obtain an aluminum source solution.

[0008] Preparation of N-doped silicoaluminotitanium molecular sieve: Add the first part of the silicon source solution to the aluminum source solution, add urea and tetrabutyl titanate, stir and mix evenly, perform the first hydrothermal reaction, add the second part of the silicon source solution, perform the second hydrothermal reaction, then add the remaining silicon source solution, perform the third hydrothermal reaction, centrifuge, wash, dry, and calcine to obtain the N-doped silicoaluminotitanium nano-molecular sieve;

[0009] S3. Fe / Ag deposition: Add the N-doped silicoaluminotitanium nano-molecular sieve prepared in step S2 to water, add silver nitrate and iron salt, stir and mix evenly, dropwise add ammonia water, stir and mix evenly, centrifuge, wash, dry, calcine, and ball mill to obtain the Fe / Ag-deposited N-doped silicoaluminotitanium nano-molecular sieve;

[0010] S4. Modification: Add the Fe / Ag-deposited N-doped silicoaluminotitanium molecular sieve prepared in step S3 to water, add dopamine hydrochloride and a catalyst, heat and stir to react, centrifuge, wash, and dry to obtain the modified nano-molecular sieve;

[0011] S5. Adsorption of menthol and borneol: Dissolve menthol and borneol in ethanol, add the modified nano-molecular sieve prepared in step S4, and evaporate the solvent to obtain the water-absorbing and insect-proof nano-molecular sieve.

[0012] As a further improvement of the present invention, the base in step S1 is selected from NaOH or KOH, and the mass ratio of the base, water, and sodium metasilicate is 0.2 - 0.4: 30 - 40: 10 - 12, and the mass ratio of the base, water, and sodium aluminate is 0.2 - 0.4: 30 - 40: 3 - 5.

[0013] As a further improvement of the present invention, the volume ratio of the first part of the silicon source solution: the second part of the silicon source solution: the remaining silicon source solution in step S2 is 1:1:1, the mass ratio of urea and tetrabutyl titanate is 0.2 - 0.4: 2 - 3, the temperature of the first hydrothermal reaction is 90 - 100 °C, the time is 3 - 5 h, the temperature of the second hydrothermal reaction is 90 - 100 °C, the time is 2 - 4 h, the temperature of the third hydrothermal reaction is 90 - 100 °C, the time is 1 - 3 h, and the temperature of the calcination is 400 - 500 °C, the time is 2 - 4 h.

[0014] As a further improvement of the present invention, the mass ratio of the N-doped silicoaluminotitanium nano-molecular sieve, silver nitrate, iron salt, and ammonia water in step S3 is 100: 5 - 7: 3 - 5: 10 - 15, the iron salt is selected from at least one of ferric chloride, ferric sulfate, and ferric nitrate, the temperature of the calcination is 500 - 700 °C, the time is 1 - 2 h, and the time of the ball milling is 2 - 4 h.

[0015] As a further improvement of the present invention, the mass ratio of the Fe / Ag-deposited N-doped silicoaluminotitanium molecular sieve, dopamine hydrochloride, and the catalyst in step S4 is 15-20:7-10:0.5-1. The catalyst is a Tris-HCl solution with a pH of 8.5-9.5, and the temperature of the heating and stirring reaction is 45-55°C, and the time is 2-4 h.

[0016] As a further improvement of the present invention, the mass ratio of menthol, borneol, and the modified nano-molecular sieve in step S5 is 3-5:4-6:30-40.

[0017] As a further improvement of the present invention, the preparation method of the water-absorbing and insect-proof nano-molecular sieve specifically includes the following steps:

[0018] S1. Preparation of the silicon-aluminum source solution: Dissolve 0.2-0.4 parts by weight of alkali in 30-40 parts by weight of water, add 10-12 parts by weight of sodium metasilicate, and stir to dissolve to obtain a silicon source solution; dissolve 0.2-0.4 parts by weight of alkali in 30-40 parts by weight of water, add 3-5 parts by weight of sodium aluminate, and stir to dissolve to obtain an aluminum source solution.

[0019] S2. Preparation of the N-doped silicoaluminotitanium molecular sieve: Add 1 / 3 volume of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, add 0.2-0.4 parts by weight of urea and 2-3 parts by weight of tetrabutyl titanate, stir and mix evenly, heat to 90-100°C, carry out a hydrothermal reaction for 3-5 h, add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 90-100°C, carry out a hydrothermal reaction for 2-4 h, then add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 90-100°C, carry out a hydrothermal reaction for 1-3 h, centrifuge, wash, dry, and calcine at 400-500°C for 2-4 h to obtain the N-doped silicoaluminotitanium nano-molecular sieve.

[0020] S3. Fe / Ag deposition: Add 100 parts by weight of the N-doped silicoaluminotitanium nano-molecular sieve prepared in step S2 to 200 parts by weight of water, add 5-7 parts by weight of silver nitrate and 3-5 parts by weight of iron salt, stir and mix evenly, dropwise add 10-15 parts by weight of ammonia water, stir and mix evenly, centrifuge, wash, dry, calcine at 500-700°C for 1-2 h, and ball mill for 2-4 h to obtain the Fe / Ag-deposited N-doped silicoaluminotitanium nano-molecular sieve.

[0021] S4. Modification: Add 15-20 parts by weight of the Fe / Ag-deposited N-doped silicoaluminotitanium molecular sieve prepared in step S3 to 100 parts by weight of water, add 7-10 parts by weight of dopamine hydrochloride and 0.5-1 part by weight of the catalyst, heat to 45-55°C, stir and react for 2-4 h, centrifuge, wash, dry, and obtain the modified nano-molecular sieve.

[0022] The catalyst is a Tris-HCl solution with a pH of 8.5 - 9.5;

[0023] S5. Adsorption of menthol and borneol: Dissolve 3 - 5 parts by weight of menthol and 4 - 6 parts by weight of borneol in 100 parts by weight of ethanol, add 30 - 40 parts by weight of the modified nano-molecular sieve prepared in step S4, and evaporate the solvent to obtain a water-absorbing and insect-proof nano-molecular sieve.

[0024] As a further improvement of the present invention, add 10 parts by weight of Chinese fir core ecological board to 100 parts by weight of an aqueous solution containing 3 - 5 wt% of silane coupling agent, heat to 40 - 50 °C, react for 2 - 4 h, take out, wash, dry, and then soak in 100 parts by weight of an aqueous dispersion of water-absorbing and insect-proof nano-molecular sieve containing 7 - 10 wt% for 5 - 7 days, take out, and dry to obtain;

[0025] The silane coupling agent is a mixture of KH550 and KH792, and the mass ratio is 10 - 12:3 - 5.

[0026] The present invention further protects a Chinese fir core ecological board treated by the method for preventing deformation of the above-mentioned Chinese fir core ecological board.

[0027] The present invention has the following beneficial effects:

[0028] The present invention prepares a water-absorbing and insect-proof nano-molecular sieve with a small particle size, a large specific surface area and a porous structure. The main component of its framework structure is SiO2 - Al2O3 - TiO2. At the same time, due to the addition of urea, it is doped with N element. The N element can replace part of the O atoms in TiO2 and enter the TiO2 lattice, causing a change in the band gap of TiO2, improving the response of TiO2 to visible light, and making the prepared molecular sieve have characteristics such as visible light catalytic antibacterial, degradation of formaldehyde, and degradation of VOCs.

[0029] Furthermore, Ag and Fe elements are deposited on the prepared N-doped silicon-aluminum-titanium molecular sieve. By loading Ag and Fe elements, the cations on the molecular sieve framework can be replaced through ion exchange. The loading of Ag element improves the antibacterial performance of the prepared water-absorbing and insect-proof nano-molecular sieve. When iron element is co-doped with N element, due to the similar ionic radius of iron ion and titanium ion, it can preferably replace titanium ion. On the one hand, it can cooperate with N element to change the band gap of TiO2 and improve the utilization efficiency of TiO2 for visible light. On the other hand, it can cooperate with Ag element to promote the catalytic degradation of VOCs by the molecular sieve, greatly improving the antibacterial, formaldehyde degradation, VOCs degradation and other performances of the prepared water-absorbing and insect-proof nano-molecular sieve.

[0030] Subsequently, polydopamine modification was carried out on the prepared Fe / Ag-deposited N-doped silicon-aluminum-titanium nano-zeolite, so that the zeolite was equipped with abundant active groups such as hydroxyl, amino, and carboxyl groups, which could be stably fixed with the carboxyl and hydroxyl groups of menthol and borneol by forming hydrogen bonds and van der Waals forces. As a result, the prepared water-absorbing and insect-proof nano-zeolite adsorbed a large amount of menthol and borneol and had a slow-release effect. After entering the gaps in the wood, it could be slowly released, playing a long-term role in preventing insects, antibacterial, and bacteriostatic effects.

[0031] After the Chinese fir core ecological board is modified by a silane coupling agent in the present invention, the connected amino groups can form a stable complex with the water-absorbing and insect-proof nano-zeolite through hydrogen bonds and van der Waals forces, thereby promoting the uniform distribution and stable fixation of the water-absorbing and insect-proof nano-zeolite inside the Chinese fir core ecological board. The water-absorbing and insect-proof nano-zeolite has abundant pores and good water absorption performance. At the same time, it can continuously release anti-insect and antibacterial active substances, and has good characteristics such as photocatalytic antibacterial, formaldehyde degradation, and VOCs degradation, making the treated Chinese fir core ecological board remain unchanged in shape for a long time, and being more environmentally friendly, safe, and of better quality, with broad application prospects. Embodiment

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Preparation Example 1 Preparation of Water-absorbing and Insect-proof Nano-zeolite

[0034] The method specifically includes the following steps:

[0035] S1. Preparation of silicon-aluminum source solution: Dissolve 0.2 parts by weight of NaOH in 30 parts by weight of water, add 10 parts by weight of sodium metasilicate, and stir to dissolve to obtain a silicon source solution; dissolve 0.2 parts by weight of NaOH in 30 parts by weight of water, add 3 parts by weight of sodium aluminate, and stir to dissolve to obtain an aluminum source solution;

[0036] S2. Preparation of N-doped silicon-aluminum-titanium zeolite: Add 1 / 3 volume of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, add 0.2 parts by weight of urea and 2 parts by weight of tetrabutyl titanate, stir and mix evenly, heat to 90 °C, carry out hydrothermal reaction for 3 h, add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 90 °C, carry out hydrothermal reaction for 2 h, then add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 90 °C, carry out hydrothermal reaction for 1 h, centrifuge, wash, dry, and calcine at 400 °C for 2 h to obtain N-doped silicon-aluminum-titanium nano-zeolite;

[0037] S3. Fe / Ag Deposition: Add 100 parts by weight of the N-doped silicon-aluminum-titanium nano-molecular sieve prepared in step S2 to 200 parts by weight of water, add 5 parts by weight of silver nitrate and 3 parts by weight of ferric chloride, stir and mix for 20 min, dropwise add 10 parts by weight of ammonia water, stir and mix for 15 min, centrifuge, wash, dry, calcine at 500 °C for 1 h, and ball mill for 2 h to obtain the Fe / Ag-deposited N-doped silicon-aluminum-titanium nano-molecular sieve;

[0038] S4. Modification: Add 15 parts by weight of the Fe / Ag-deposited N-doped silicon-aluminum-titanium molecular sieve prepared in step S3 to 100 parts by weight of water, add 7 parts by weight of dopamine hydrochloride and 0.5 part by weight of catalyst, heat to 45 °C, stir and react for 2 h, centrifuge, wash, dry to obtain the modified nano-molecular sieve;

[0039] The catalyst is a Tris-HCl solution with a pH of 8.5;

[0040] S5. Adsorption of Menthol and Borneol: Dissolve 3 parts by weight of menthol and 4 parts by weight of borneol in 100 parts by weight of ethanol, add 30 parts by weight of the modified nano-molecular sieve prepared in step S4, and evaporate the solvent to obtain the water-absorbing and insect-proof nano-molecular sieve.

[0041] Preparation Example 2 Preparation of Water-Absorbing and Insect-Proof Nano-Molecular Sieve

[0042] The method specifically includes the following steps:

[0043] S1. Preparation of Silicon-Aluminum Source Solution: Dissolve 0.4 part by weight of NaOH in 40 parts by weight of water, add 12 parts by weight of sodium metasilicate, stir and dissolve to obtain the silicon source solution; dissolve 0.4 part by weight of NaOH in 40 parts by weight of water, add 5 parts by weight of sodium aluminate, stir and dissolve to obtain the aluminum source solution;

[0044] S2. Preparation of N-Doped Silicon-Aluminum-Titanium Molecular Sieve: Add 1 / 3 volume part of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, add 0.4 part by weight of urea and 3 parts by weight of tetrabutyl titanate, stir and mix evenly, heat to 100 °C, carry out hydrothermal reaction for 5 h, add 1 / 3 volume part of the silicon source solution prepared in step S1, heat to 100 °C, carry out hydrothermal reaction for 4 h, then add 1 / 3 volume part of the silicon source solution prepared in step S1, heat to 100 °C, carry out hydrothermal reaction for 3 h, centrifuge, wash, dry, calcine at 500 °C for 4 h to obtain the N-doped silicon-aluminum-titanium nano-molecular sieve;

[0045] S3. Fe / Ag Deposition: Add 100 parts by weight of the N-doped silicon-aluminum-titanium nano-molecular sieve prepared in step S2 to 200 parts by weight of water, add 7 parts by weight of silver nitrate and 5 parts by weight of ferric sulfate, stir and mix for 20 min, dropwise add 15 parts by weight of ammonia water, stir and mix for 15 min, centrifuge, wash, dry, calcine at 700 °C for 2 h, and ball mill for 4 h to obtain the Fe / Ag-deposited N-doped silicon-aluminum-titanium nano-molecular sieve;

[0046] S4. Modification: Add 20 parts by weight of the Fe / Ag-deposited N-doped silicon-aluminum-titanium molecular sieve prepared in step S3 to 100 parts by weight of water, add 10 parts by weight of dopamine hydrochloride and 1 part by weight of catalyst, heat to 55 °C, stir and react for 4 h, centrifuge, wash, dry to obtain the modified nano-molecular sieve;

[0047] The catalyst is a Tris-HCl solution with a pH of 9.5;

[0048] S5. Adsorption of Menthol and Borneol: Dissolve 5 parts by weight of menthol and 6 parts by weight of borneol in 100 parts by weight of ethanol, add 40 parts by weight of the modified nano-molecular sieve prepared in step S4, and evaporate the solvent to obtain the water-absorbing and insect-proof nano-molecular sieve.

[0049] Preparation Example 3 Preparation of Water-Absorbing and Insect-Proof Nano-Molecular Sieve

[0050] The method specifically includes the following steps:

[0051] S1. Preparation of Silicon-Aluminum Source Solution: Dissolve 0.3 parts by weight of NaOH in 35 parts by weight of water, add 11 parts by weight of sodium metasilicate, stir and dissolve to obtain the silicon source solution; dissolve 0.3 parts by weight of NaOH in 35 parts by weight of water, add 4 parts by weight of sodium aluminate, stir and dissolve to obtain the aluminum source solution;

[0052] S2. Preparation of N-Doped Silicon-Aluminum-Titanium Molecular Sieve: Add 1 / 3 volume of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, add 0.3 parts by weight of urea and 2.5 parts by weight of tetrabutyl titanate, stir and mix evenly, heat to 95 °C, carry out hydrothermal reaction for 4 h, add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 3 h, then add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 2 h, centrifuge, wash, dry, and calcine at 450 °C for 3 h to obtain the N-doped silicon-aluminum-titanium nano-molecular sieve;

[0053] S3. Fe / Ag Deposition: Add 100 parts by weight of the N-doped silicon-aluminum-titanium nano-molecular sieve prepared in step S2 to 200 parts by weight of water, add 6 parts by weight of silver nitrate and 4 parts by weight of iron nitrate, stir and mix for 20 min, dropwise add 12 parts by weight of ammonia water, stir and mix for 15 min, centrifuge, wash, dry, calcine at 600 °C for 1.5 h, and ball mill for 3 h to obtain Fe / Ag-deposited N-doped silicon-aluminum-titanium nano-molecular sieve;

[0054] S4. Modification: Add 17 parts by weight of the Fe / Ag-deposited N-doped silicon-aluminum-titanium molecular sieve prepared in step S3 to 100 parts by weight of water, add 8 parts by weight of dopamine hydrochloride and 0.7 parts by weight of catalyst, heat to 50 °C, stir and react for 3 h, centrifuge, wash, dry to obtain the modified nano-molecular sieve;

[0055] The catalyst is a Tris-HCl solution with pH = 9;

[0056] S5. Adsorption of Menthol and Borneol: Dissolve 4 parts by weight of menthol and 5 parts by weight of borneol in 100 parts by weight of ethanol, add 35 parts by weight of the modified nano-molecular sieve prepared in step S4, and evaporate the solvent to obtain the water-absorbing and insect-proof nano-molecular sieve.

[0057] Comparative Preparation Example 1

[0058] Compared with Preparation Example 3, the difference lies in that urea was not added in step S2.

[0059] Specifically as follows:

[0060] S2. Preparation of Silicon-Aluminum-Titanium Molecular Sieve: Add 1 / 3 volume part of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, add 2.5 parts by weight of tetrabutyl titanate, stir and mix evenly, heat to 95 °C, carry out hydrothermal reaction for 4 h, add 1 / 3 volume part of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 3 h, then add 1 / 3 volume part of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 2 h, centrifuge, wash, dry, and calcine at 450 °C for 3 h to obtain the silicon-aluminum-titanium nano-molecular sieve.

[0061] Comparative Preparation Example 2

[0062] Compared with Preparation Example 3, the difference lies in that tetrabutyl titanate and urea were not added in step S2.

[0063] Specifically as follows:

[0064] S2. Preparation of Silicoaluminophosphate Molecular Sieve: Add 1 / 3 volume portion of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, stir and mix evenly, heat to 95 °C, carry out hydrothermal reaction for 4 h, add 1 / 3 volume portion of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 3 h, then add 1 / 3 volume portion of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 2 h, centrifuge, wash, dry, and calcine at 450 °C for 3 h to obtain the silicoaluminophosphate nano-molecular sieve.

[0065] Comparative Preparation Example 3

[0066] Compared with Preparation Example 3, the difference lies in that silver nitrate is not added in step S3.

[0067] Specifically as follows:

[0068] S3. Fe Deposition: Add 100 parts by weight of the N-doped silicoaluminotitanate nano-molecular sieve prepared in step S2 to 200 parts by weight of water, add 10 parts by weight of iron nitrate, stir and mix for 20 min, dropwise add 12 parts by weight of ammonia water, stir and mix for 15 min, centrifuge, wash, dry, calcine at 600 °C for 1.5 h, and ball mill for 3 h to obtain the Fe-deposited N-doped silicoaluminotitanate nano-molecular sieve.

[0069] Comparative Preparation Example 4

[0070] Compared with Preparation Example 3, the difference lies in that iron nitrate is not added in step S3.

[0071] Specifically as follows:

[0072] S3. Ag Deposition: Add 100 parts by weight of the N-doped silicoaluminotitanate nano-molecular sieve prepared in step S2 to 200 parts by weight of water, add 10 parts by weight of silver nitrate, stir and mix for 20 min, dropwise add 12 parts by weight of ammonia water, stir and mix for 15 min, centrifuge, wash, dry, calcine at 600 °C for 1.5 h, and ball mill for 3 h to obtain the Ag-deposited N-doped silicoaluminotitanate nano-molecular sieve.

[0073] Comparative Preparation Example 5

[0074] Compared with Preparation Example 3, the difference lies in that step S3 is not carried out.

[0075] Specifically as follows:

[0076] S1. Preparation of Silicon-Aluminum Source Solution: Dissolve 0.3 part by weight of NaOH in 35 parts by weight of water, add 11 parts by weight of sodium metasilicate, stir and dissolve to obtain the silicon source solution; dissolve 0.3 part by weight of NaOH in 35 parts by weight of water, add 4 parts by weight of sodium aluminate, stir and dissolve to obtain the aluminum source solution;

[0077] Preparation of N-doped silicoaluminotitanium molecular sieve: Add 1 / 3 volume portion of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, add 0.3 parts by weight of urea and 2.5 parts by weight of tetrabutyl titanate, stir and mix evenly, heat to 95 °C, carry out hydrothermal reaction for 4 h, add 1 / 3 volume portion of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 3 h, then add 1 / 3 volume portion of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 2 h, centrifuge, wash, dry, and calcine at 450 °C for 3 h to obtain N-doped silicoaluminotitanium nano-molecular sieve;

[0078] S3. Modification: Add 17 parts by weight of the N-doped silicoaluminotitanium nano-molecular sieve prepared in step S2 to 100 parts by weight of water, add 8 parts by weight of dopamine hydrochloride and 0.7 parts by weight of catalyst, heat to 50 °C, stir and react for 3 h, centrifuge, wash, dry to obtain modified nano-molecular sieve;

[0079] The catalyst is Tris-HCl solution with pH = 9;

[0080] S4. Adsorption of menthol and borneol: Dissolve 4 parts by weight of menthol and 5 parts by weight of borneol in 100 parts by weight of ethanol, add 35 parts by weight of the modified nano-molecular sieve prepared in step S3, evaporate the solvent to dryness to obtain water-absorbing and insect-proof nano-molecular sieve.

[0081] Comparative Preparation Example 6

[0082] Compared with Preparation Example 3, the difference is that step S4 is not carried out.

[0083] Specifically as follows:

[0084] S1. Preparation of silicon-aluminum source solution: Dissolve 0.3 parts by weight of NaOH in 35 parts by weight of water, add 11 parts by weight of sodium metasilicate, stir and dissolve to obtain silicon source solution; Dissolve 0.3 parts by weight of NaOH in 35 parts by weight of water, add 4 parts by weight of sodium aluminate, stir and dissolve to obtain aluminum source solution;

[0085] S2. Preparation of N-doped silicoaluminotitanium molecular sieve: Add 1 / 3 volume portion of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, add 0.3 parts by weight of urea and 2.5 parts by weight of tetrabutyl titanate, stir and mix evenly, heat to 95 °C, carry out hydrothermal reaction for 4 h, add 1 / 3 volume portion of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 3 h, then add 1 / 3 volume portion of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 2 h, centrifuge, wash, dry, and calcine at 450 °C for 3 h to obtain N-doped silicoaluminotitanium nano-molecular sieve;

[0086] S3. Fe / Ag Deposition: Add 100 parts by weight of the N-doped silicon-aluminum-titanium nano-molecular sieve prepared in step S2 to 200 parts by weight of water, add 6 parts by weight of silver nitrate and 4 parts by weight of iron nitrate, stir and mix for 20 min, dropwise add 12 parts by weight of ammonia water, stir and mix for 15 min, centrifuge, wash, dry, calcine at 600 °C for 1.5 h, and ball mill for 3 h to obtain the Fe / Ag-deposited N-doped silicon-aluminum-titanium nano-molecular sieve;

[0087] S4. Modification: Add 17 parts by weight of the Fe / Ag-deposited N-doped silicon-aluminum-titanium molecular sieve prepared in step S3 to 100 parts by weight of water, add 8 parts by weight of dopamine hydrochloride and 0.7 parts by weight of catalyst, heat to 50 °C, stir and react for 3 h, centrifuge, wash, dry to obtain the modified nano-molecular sieve;

[0088] The catalyst is a Tris-HCl solution with a pH of 9;

[0089] S5. Adsorption of Menthol and Borneol: Dissolve 4 parts by weight of menthol and 5 parts by weight of borneol in 100 parts by weight of ethanol, add 35 parts by weight of the modified nano-molecular sieve prepared in step S4, and evaporate the solvent to obtain the water-absorbing and insect-proof nano-molecular sieve.

[0090] Comparative Preparation Example 7

[0091] Compared with Preparation Example 3, the difference is that menthol is not added in step S5.

[0092] Specifically as follows:

[0093] S5. Adsorption of Borneol: Dissolve 9 parts by weight of borneol in 100 parts by weight of ethanol, add 35 parts by weight of the modified nano-molecular sieve prepared in step S4, and evaporate the solvent to obtain the water-absorbing and insect-proof nano-molecular sieve.

[0094] Comparative Preparation Example 8

[0095] Compared with Preparation Example 3, the difference is that borneol is not added in step S5.

[0096] Specifically as follows:

[0097] S5. Adsorption of Menthol: Dissolve 9 parts by weight of menthol in 100 parts by weight of ethanol, add 35 parts by weight of the modified nano-molecular sieve prepared in step S4, and evaporate the solvent to obtain the water-absorbing and insect-proof nano-molecular sieve.

[0098] Comparative Preparation Example 9

[0099] Compared with Preparation Example 3, the difference is that step S5 is not carried out.

[0100] Specifically as follows:

[0101] S1. Preparation of silicon-aluminum source solution: Dissolve 0.3 parts by weight of NaOH in 35 parts by weight of water, add 11 parts by weight of sodium metasilicate, and stir to dissolve to obtain a silicon source solution; dissolve 0.3 parts by weight of NaOH in 35 parts by weight of water, add 4 parts by weight of sodium aluminate, and stir to dissolve to obtain an aluminum source solution;

[0102] S2. Preparation of N-doped silicon-aluminum-titanium molecular sieve: Add 1 / 3 volume of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, add 0.3 parts by weight of urea and 2.5 parts by weight of tetrabutyl titanate, stir and mix evenly, heat to 95 °C, carry out hydrothermal reaction for 4 h, add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 3 h, then add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 95 °C, carry out hydrothermal reaction for 2 h, centrifuge, wash, dry, and calcine at 450 °C for 3 h to obtain N-doped silicon-aluminum-titanium nano-molecular sieve;

[0103] S3. Fe / Ag deposition: Add 100 parts by weight of the N-doped silicon-aluminum-titanium nano-molecular sieve prepared in step S2 to 200 parts by weight of water, add 6 parts by weight of silver nitrate and 4 parts by weight of iron nitrate, stir and mix for 20 min, dropwise add 12 parts by weight of ammonia water, stir and mix for 15 min, centrifuge, wash, dry, and calcine at 600 °C for 1.5 h, and ball mill for 3 h to obtain Fe / Ag-deposited N-doped silicon-aluminum-titanium nano-molecular sieve;

[0104] S4. Modification: Add 17 parts by weight of the Fe / Ag-deposited N-doped silicon-aluminum-titanium molecular sieve prepared in step S3 to 100 parts by weight of water, add 8 parts by weight of dopamine hydrochloride and 0.7 parts by weight of catalyst, heat to 50 °C, stir and react for 3 h, centrifuge, wash, dry to obtain a modified nano-molecular sieve, which is a water-absorbing and insect-proof nano-molecular sieve;

[0105] The catalyst is a Tris-HCl solution with pH = 9.

[0106] Test Example 1

[0107] Dry the water-absorbing and insect-proof nano-molecular sieves prepared in Preparation Examples 1-3 and Comparative Preparation Examples 1-9 to constant weight, weigh them as w0, place them in a closed container, and the container is filled with a saturated Mg(NO3)2 salt solution [this saturated salt solution provides a relative humidity of (50 ± 5)% at 30 °C and (45 ± 5)% at 50 °C]. And keep the closed container at 30 °C and 50 °C for 6 h respectively to complete the water vapor adsorption experiment, take it out, weigh it as w1, and the water vapor adsorption amount is (w1 - w0) / w0.

[0108] The results are shown in Table 1.

[0109] Table 1

[0110]

[0111] As can be seen from the above table, the water-absorbing and insect-proof nano-molecular sieves prepared in Preparation Examples 1-3 of the present invention have good water-absorbing and drying properties.

[0112] Test Example 2

[0113] The water-absorbing and insect-proof nano-molecular sieves prepared in Preparation Examples 1-3 and Comparative Preparation Examples 1-9 were subjected to a test on the effect of killing harmful microorganisms. The determination method adopted GBT 18204.4-2013 "Hygiene Inspection Methods for Public Places - Part 4: Microorganisms on Public Supplies and Utensils".

[0114] The results are shown in Table 2.

[0115] Table 2

[0116]

[0117] As can be seen from the above table, the water-absorbing and insect-proof nano-molecular sieves prepared in Preparation Examples 1-3 of the present invention have good bactericidal properties.

[0118] Test Example 3

[0119] The water-absorbing and insect-proof nano-molecular sieves prepared in Preparation Examples 1-3 and Comparative Preparation Examples 1-9 were tested in accordance with JC / T 1074-2008 "Purification Performance of Indoor Air Purification Functional Coating Materials" and GB / T 18883-2002 "Indoor Air Quality Standard". 0.5 g of the water-absorbing and insect-proof nano-molecular sieve was placed in a closed chamber, and formaldehyde and toluene were injected through the injection port. The initial concentrations of formaldehyde and toluene in the test chamber were 10.0 mg / m 3 (C0), which were 100 and 50 times the limits of GB / T 18883-2002 (0.10 and 0.20 mg / m 3 ), respectively. After observing for 24 h, the purification efficiencies of formaldehyde and toluene in the air were tested.

[0120] Purification efficiency N t = (C0 - C t ) / C0 × 100%

[0121] Where: C t : Instantaneous concentration, that is, the concentration of formaldehyde or toluene in the air at different times during the test, mg / m 3 ; t: Test time, h.

[0122] The results are shown in Table 3.

[0123] Table 3

[0124]

[0125] As can be seen from the above table, the water-absorbing and insect-proof nano-molecular sieves prepared in Preparation Examples 1-3 of the present invention have good purification efficiencies for formaldehyde and toluene.

[0126] When Comparative Preparation Example 1 is compared with Preparation Example 3, urea is not added in step S2. When Comparative Preparation Example 2 is compared with Preparation Example 3, tetrabutyl titanate and urea are not added in step S2. The water absorption performance, antibacterial performance, and the performance of degrading formaldehyde and toluene decrease. The present invention prepares a water-absorbing and insect-proof nano-molecular sieve, which has a small particle size, a large specific surface area and a porous structure. The main components of its framework structure are SiO2-Al2O3-TiO2. At the same time, due to the addition of urea, it is doped with N element. The N element can replace some O atoms in TiO2 and enter the TiO2 lattice, causing a change in the band gap of TiO2 and improving the response of TiO2 to visible light, so that the prepared molecular sieve has the characteristics of visible light catalytic antibacterial, degrading formaldehyde, and degrading VOCs.

[0127] When Comparative Preparation Examples 3 and 4 are compared with Preparation Example 3, silver nitrate or iron nitrate is not added in step S3. When Comparative Preparation Example 5 is compared with Preparation Example 3, step S3 is not carried out. The antibacterial performance and the performance of degrading formaldehyde and toluene decrease. The Ag and Fe elements deposited on the prepared N-doped silicon-aluminum-titanium molecular sieve can replace the cations on the molecular sieve framework through ion exchange by loading Ag and Fe elements. The loading of Ag element improves the antibacterial performance of the prepared water-absorbing and insect-proof nano-molecular sieve. When iron element is co-doped with N element, due to the similar ionic radius of iron ion and titanium ion, it can preferably replace titanium ion. On the one hand, it can cooperate with N element to change the band gap of TiO2 and improve the utilization efficiency of TiO2 for visible light. On the other hand, it can cooperate with Ag element to promote the catalytic degradation of VOCs by the molecular sieve, greatly improving the antibacterial, formaldehyde-degrading, VOCs-degrading and other performances of the prepared water-absorbing and insect-proof nano-molecular sieve.

[0128] When Comparative Preparation Example 6 is compared with Preparation Example 3, step S4 is not carried out. The antibacterial performance and the performance of degrading formaldehyde and toluene decrease. Subsequently, polydopamine modification is carried out on the prepared Fe / Ag-deposited N-doped silicon-aluminum-titanium nano-molecular sieve, so that the molecular sieve has rich active groups such as hydroxyl, amino, and carboxyl groups, so that it can be stably fixed with the carboxyl and hydroxyl groups of menthol and borneol through hydrogen bonds and van der Waals forces, and at the same time, it can also be well fixed with the modified Chinese fir core ecological board, promoting the uniform distribution of the water-absorbing and insect-proof nano-molecular sieve in the gaps of the Chinese fir core ecological board.

[0129] Comparing Preparation Examples 7 and 8 with Preparation Example 3, menthol or borneol was not added in step S5. Comparing Preparation Example 9 with Preparation Example 3, step S5 was not carried out. The antibacterial property decreased. Subsequently, polydopamine modification was carried out on the prepared Fe / Ag-deposited N-doped silicoaluminotitanium nanomolecular sieve, so that the molecular sieve was provided with abundant active groups such as hydroxyl groups, amino groups, and carboxyl groups, so that it could be stably fixed with the carboxyl groups and hydroxyl groups of menthol and borneol by forming hydrogen bonds and van der Waals forces. As a result, the prepared water-absorbing and insect-proof nanomolecular sieve adsorbed a large amount of menthol and borneol and had a slow-release effect. After entering the gaps of the wood, it could be slowly released, achieving a long-term insect-proof, antibacterial, and bacteriostatic effect. Example

[0130] This example provides a method for preventing deformation of a Chinese fir core ecological board. Add 10 parts by weight of the Chinese fir core ecological board to 100 parts by weight of an aqueous solution containing 3 wt% of a silane coupling agent, heat to 40 °C, react for 2 h, take out, wash, dry, and then soak in 100 parts by weight of an aqueous dispersion of the water-absorbing and insect-proof nanomolecular sieve prepared in Preparation Example 1 containing 7 wt% for 5 days, take out, dry, and that's it.

[0131] The silane coupling agent is a mixture of KH550 and KH792, and the mass ratio is 10:3. Example

[0132] This example provides a method for preventing deformation of a Chinese fir core ecological board. Add 10 parts by weight of the Chinese fir core ecological board to 100 parts by weight of an aqueous solution containing 5 wt% of a silane coupling agent, heat to 50 °C, react for 4 h, take out, wash, dry, and then soak in 100 parts by weight of an aqueous dispersion of the water-absorbing and insect-proof nanomolecular sieve prepared in Preparation Example 2 containing 10 wt% for 7 days, take out, dry, and that's it.

[0133] The silane coupling agent is a mixture of KH550 and KH792, and the mass ratio is 12:5. Example

[0134] This example provides a method for preventing deformation of a Chinese fir core ecological board. Add 10 parts by weight of the Chinese fir core ecological board to 100 parts by weight of an aqueous solution containing 4 wt% of a silane coupling agent, heat to 45 °C, react for 2 - 4 h, take out, wash, dry, and then soak in 100 parts by weight of an aqueous dispersion of the water-absorbing and insect-proof nanomolecular sieve prepared in Preparation Example 3 containing 8.5 wt% for 6 days, take out, dry, and that's it.

[0135] The silane coupling agent is a mixture of KH550 and KH792, and the mass ratio is 11:4. Example

[0136] Compared with Example 3, the difference is that the silane coupling agent is a single KH550. Example

[0137] Compared with Example 3, the difference lies in that the silane coupling agent is a single KH792.

[0138] Comparative Example 1-9

[0139] Compared with Example 3, the difference lies in that the water-absorbing and insect-proof nano-molecular sieves are prepared from Comparative Preparation Examples 1-9 respectively.

[0140] Comparative Example 10

[0141] Compared with Example 3, the difference lies in that no silane coupling agent is added.

[0142] Test Example 4

[0143] The treated Chinese fir core ecological boards prepared in Examples 1-5 and Comparative Examples 1-10 of the present invention were tested with ordinary Chinese fir core ecological boards.

[0144] The deformation rate after 3 months of use was tested in a humid environment with a relative humidity of (90±5)% and an environment contaminated with insect eggs.

[0145] The drug absorption amount was tested as the difference between the weight of the wood board dried to a constant weight after being immersed in the water-dispersion liquid of the water-absorbing and insect-proof nano-molecular sieve and the weight of the wood board dried to a constant weight after being modified with the silane coupling agent, divided by the weight of the wood board dried to a constant weight after being modified with the silane coupling agent.

[0146] The results are shown in Table 4.

[0147] Table 4

[0148]

[0149] As can be seen from the above table, the treated Chinese fir core ecological boards prepared in Examples 1-3 of the present invention have smaller deformation amounts and can well prevent deformation.

[0150] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preventing deformation of a Chinese fir core ecological board, characterized in that, After the Chinese fir core ecological board is modified with a silane coupling agent, it is soaked in an aqueous dispersion of water-absorbing and insect-proof nano-molecular sieve for 5-7 days, taken out and dried, and that's it. Among them, the preparation method of the water-absorbing and insect-proof nano-molecular sieve is as follows: S1. Preparation of the silicon-aluminum source solution: Dissolve the alkali in water, add sodium metasilicate, and stir to dissolve to obtain a silicon source solution; dissolve the alkali in water, add sodium aluminate, and stir to dissolve to obtain an aluminum source solution. The mass ratio of the alkali, water, and sodium metasilicate is 0.2-0.4:30-40:10-12, and the mass ratio of the alkali, water, and sodium aluminate is 0.2-0.4:30-40:3-5. S2. Preparation of N-doped silicon-aluminum-titanium molecular sieve: Add the first part of the silicon source solution to the aluminum source solution, add urea and tetrabutyl titanate, stir and mix evenly, conduct the first hydrothermal reaction, add the second part of the silicon source solution, conduct the second hydrothermal reaction, and then add the remaining silicon source solution to conduct the third hydrothermal reaction, centrifuge, wash, dry, and calcine to obtain the N-doped silicon-aluminum-titanium nano-molecular sieve. The volume ratio of the first part of the silicon source solution: the second part of the silicon source solution: the remaining silicon source solution is 1:1:1, and the mass ratio of urea and tetrabutyl titanate is 0.2-0.4:2-3. S3. Fe / Ag deposition: Add the N-doped silicon-aluminum-titanium nano-molecular sieve prepared in step S2 to water, add silver nitrate and iron salt, stir and mix evenly, dropwise add ammonia water, stir and mix evenly, centrifuge, wash, dry, and calcine, and ball mill to obtain the Fe / Ag-deposited N-doped silicon-aluminum-titanium nano-molecular sieve. The mass ratio of the N-doped silicon-aluminum-titanium nano-molecular sieve, silver nitrate, iron salt, and ammonia water is 100:5-7:3-5:10-15. S4. Modification: Add the Fe / Ag-deposited N-doped silicon-aluminum-titanium molecular sieve prepared in step S3 to water, add dopamine hydrochloride and a catalyst, heat and stir to react, centrifuge, wash, and dry to obtain the modified nano-molecular sieve. The mass ratio of the Fe / Ag-deposited N-doped silicon-aluminum-titanium molecular sieve, dopamine hydrochloride, and catalyst is 15-20:7-10:0.5-1. S5. Adsorption of menthol and borneol: Dissolve menthol and borneol in ethanol, add the modified nano-molecular sieve prepared in step S4, and evaporate the solvent to obtain the water-absorbing and insect-proof nano-molecular sieve. The mass ratio of menthol, borneol, and the modified nano-molecular sieve is 3-5:4-6:30-40.

2. The method for preventing deformation of the Chinese fir core ecological board according to claim 1, characterized in that, The alkali described in step S1 is selected from NaOH or KOH.

3. The method for preventing deformation of the Chinese fir core ecological board according to claim 1, characterized in that, In step S2, the temperature of the first hydrothermal reaction is 90-100 °C, and the time is 3-5 h. The temperature of the second hydrothermal reaction is 90-100 °C, and the time is 2-4 h. The temperature of the third hydrothermal reaction is 90-100 °C, and the time is 1-3 h. The temperature of the calcination is 400-500 °C, and the time is 2-4 h.

4. The method for preventing deformation of the Chinese fir core ecological board according to claim 1, characterized in that, In step S3, the iron salt is selected from at least one of ferric chloride, ferric sulfate, and ferric nitrate. The temperature of the calcination is 500-700 °C, and the time is 1-2 h. The time of the ball milling is 2-4 h.

5. The method for preventing deformation of the Chinese fir core ecological board according to claim 1, characterized in that, The catalyst described in step S4 is a Tris-HCl solution with a pH of 8.5 - 9.

5. The temperature of the heating and stirring reaction is 45 - 55°C, and the time is 2 - 4 h.

6. The method for preventing deformation of the Chinese fir core ecological board according to claim 1, characterized in that, The preparation method of the water-absorbing and insect-proof nano-molecular sieve specifically includes the following steps: S1. Preparation of the silicon-aluminum source solution: Dissolve 0.2 - 0.4 parts by weight of alkali in 30 - 40 parts by weight of water, add 10 - 12 parts by weight of sodium metasilicate, and stir to dissolve to obtain a silicon source solution; dissolve 0.2 - 0.4 parts by weight of alkali in 30 - 40 parts by weight of water, add 3 - 5 parts by weight of sodium aluminate, and stir to dissolve to obtain an aluminum source solution. S2. Preparation of the N-doped silicon-aluminum-titanium molecular sieve: Add 1 / 3 volume of the silicon source solution prepared in step S1 to the aluminum source solution prepared in step S1, add 0.2 - 0.4 parts by weight of urea and 2 - 3 parts by weight of tetrabutyl titanate, stir and mix evenly, heat to 90 - 100°C, carry out a hydrothermal reaction for 3 - 5 h, add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 90 - 100°C, carry out a hydrothermal reaction for 2 - 4 h, then add 1 / 3 volume of the silicon source solution prepared in step S1, heat to 90 - 100°C, carry out a hydrothermal reaction for 1 - 3 h, centrifuge, wash, dry, and calcine at 400 - 500°C for 2 - 4 h to obtain the N-doped silicon-aluminum-titanium nano-molecular sieve. S3. Fe / Ag deposition: Add 100 parts by weight of the N-doped silicon-aluminum-titanium nano-molecular sieve prepared in step S2 to 200 parts by weight of water, add 5 - 7 parts by weight of silver nitrate and 3 - 5 parts by weight of iron salt, stir and mix evenly, dropwise add 10 - 15 parts by weight of ammonia water, stir and mix evenly, centrifuge, wash, dry, calcine at 500 - 700°C for 1 - 2 h, and ball mill for 2 - 4 h to obtain the Fe / Ag-deposited N-doped silicon-aluminum-titanium nano-molecular sieve. S4. Modification: Add 15 - 20 parts by weight of the Fe / Ag-deposited N-doped silicon-aluminum-titanium molecular sieve prepared in step S3 to 100 parts by weight of water, add 7 - 10 parts by weight of dopamine hydrochloride and 0.5 - 1 part by weight of catalyst, heat to 45 - 55°C, stir and react for 2 - 4 h, centrifuge, wash, dry, and obtain the modified nano-molecular sieve. The catalyst is a Tris-HCl solution with a pH of 8.5 - 9.5; S5. Adsorption of menthol and borneol: Dissolve 3 - 5 parts by weight of menthol and 4 - 6 parts by weight of borneol in 100 parts by weight of ethanol, add 30 - 40 parts by weight of the modified nano-molecular sieve prepared in step S4, evaporate the solvent to dryness, and obtain the water-absorbing and insect-proof nano-molecular sieve.

7. The method for preventing deformation of the Chinese fir core ecological board according to claim 1, characterized in that, Add 10 parts by weight of the Chinese fir core ecological board to 100 parts by weight of an aqueous solution containing 3 - 5 wt% of silane coupling agent, heat to 40 - 50°C, react for 2 - 4 h, take out, wash, dry, and then soak in 100 parts by weight of an aqueous dispersion of the water-absorbing and insect-proof nano-molecular sieve containing 7 - 10 wt% for 5 - 7 days, take out, dry, and it is ready. The silane coupling agent is a mixture of KH550 and KH792, and the mass ratio is 10 - 12:3 - 5.

8. A Chinese fir core ecological board treated by the method for preventing deformation of the Chinese fir core ecological board according to any one of claims 1 - 7.

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