A diatomaceous earth inorganic mineral plate for furniture manufacturing and a method for manufacturing the same

Abstract

The application relates to the technical field of building decoration materials, and particularly discloses a diatomite inorganic mineral plate for furniture manufacturing and a preparation method thereof. The diatomite inorganic mineral plate for furniture manufacturing is prepared by compounding an upper diatomite inorganic mineral plate blank, a mesh cloth balance layer and a lower diatomite inorganic mineral plate blank; the upper diatomite inorganic mineral plate blank and the lower diatomite inorganic mineral plate blank are made of the same material and are made of raw materials containing the following components in parts by weight: modified diatomite 30-60 parts, cement 10-30 parts, slaked lime 15-25 parts, paper pulp fiber 6-10 parts, quartz powder 0.1-20 parts, hemihydrate gypsum 1-5 parts, nano titanium dioxide 0.5-1.5 parts, antibacterial agent 0.01-0.1 part and pigment 0.1-0.3 part. The application can significantly reduce the adverse effects caused by frequent temperature changes in an extremely humid environment, and further improve the moisture-proof stability and durability of the diatomite inorganic mineral plate.

Description

Technical Field

[0001] This application relates to the field of building decoration materials technology, and more specifically, it relates to a diatomaceous earth inorganic mineral board for furniture manufacturing and a method for preparing the same. Background Technology

[0002] Traditional engineered wood products, such as MDF and particleboard, are widely used in furniture manufacturing and interior decoration. However, these products generally use formaldehyde-containing adhesives, which continuously release volatile organic compounds (TVOCs) such as formaldehyde and benzene, posing a threat to the indoor environment and human health. They also have drawbacks such as being flammable, susceptible to water damage, and prone to mold growth.

[0003] To address these issues, inorganic boards, primarily composed of inorganic cementing materials such as cement and gypsum, have emerged. While these boards offer good fire and moisture resistance, they generally suffer from high density, brittleness, and difficulty in typical wood-based panel processing operations such as sawing, planing, edge banding, and the use of connectors, significantly limiting their application in furniture manufacturing.

[0004] In recent years, with the development and utilization of diatomite resources, inorganic mineral boards made primarily of diatomite have gradually attracted attention. Diatomite is a biogenic siliceous sedimentary rock with characteristics such as low density, porosity, large specific surface area, and good adsorption. my country has abundant diatomite reserves, ranking second in the world. Diatomite inorganic mineral boards are a new type of environmentally friendly decorative material made primarily of natural diatomite and solidified using inorganic cementing materials. It achieves a unified approach to environmental protection, fire resistance, and decoration, representing a revolutionary innovation in the field of building decoration materials and possessing broad application value in furniture manufacturing.

[0005] Regarding the aforementioned technologies, the inventors believe that when diatomaceous earth inorganic mineral boards are in an extremely humid environment, they are often accompanied by frequent temperature fluctuations. In this repeated cyclical application, reciprocating stress changes will occur, which can easily lead to the propagation of microcracks in the internal structure. This stress fatigue will destroy the integrity of the material and cause the moisture-proof performance to gradually be lost.

[0006] Therefore, there is an urgent need to propose a solution to address the aforementioned technical problems. Summary of the Invention

[0007] In order to reduce the adverse effects of frequent temperature changes in extremely humid environments and thus improve the moisture-proof stability and durability of diatomaceous earth inorganic mineral boards, this application provides a diatomaceous earth inorganic mineral board for furniture manufacturing and its preparation method.

[0008] In a first aspect, this application provides a diatomaceous earth inorganic mineral board for furniture manufacturing, employing the following technical solution: A diatomaceous earth inorganic mineral board for furniture manufacturing is compositely prepared from an upper diatomaceous earth inorganic mineral board blank, a mesh cloth balancing layer, and a lower diatomaceous earth inorganic mineral board blank; the upper and lower diatomaceous earth inorganic mineral board blanks are made of the same material and are made from raw materials comprising the following parts by weight: 30-60 parts of modified diatomaceous earth; 10-30 parts cement; 15-25 parts of slaked lime; 6-10 parts pulp fiber; Quartz powder 0.1-20 parts; 1-5 parts of hemihydrate gypsum; 0.5-1.5 parts of nano-titanium dioxide; Antibacterial agent 0.01-0.1 parts; Pigment 0.1-0.3 parts; The modified diatomaceous earth was prepared through the following steps: S1. After roasting the diatomaceous earth raw material, cool it and then mix it with water to obtain diatomaceous earth slurry. S2. Polydimethyldiallylammonium chloride is added to the diatomaceous earth slurry obtained in step S1. After heating and stirring to react, the mixture is filtered and dried to obtain pretreated diatomaceous earth. S3. After mixing the pretreated diatomaceous earth obtained in step S2 with aluminum sol and water glass, the mixture is heated and stirred to react, then vacuum impregnated, and finally filtered and dried to obtain modified diatomaceous earth.

[0009] By adopting the above technical solutions, the use of the mesh cloth balancing layer can avoid structural deformation caused by external impact and compression, acting as a "soft steel reinforcement". In the raw materials for preparing the upper and lower diatomaceous earth inorganic mineral slab blanks, cement serves as the main cementing material, providing initial strength and structural stability; quicklime reacts with carbon dioxide in a humid environment to generate calcium carbonate, achieving self-healing function, while simultaneously adjusting the pH value of the system and promoting hydration reaction; pulp fiber, as a reinforcing fiber, can improve the flexural strength and toughness of the board; quartz powder, as a siliceous material, improves the hardness and wear resistance of the board; hemihydrate gypsum hydrates during curing to generate dihydrate gypsum, filling pores and increasing density; nano-titanium dioxide has photocatalytic activity, degrading harmful gases such as formaldehyde under light; antibacterial agents provide long-lasting antibacterial and antifungal properties; pigments impart decorative properties to the board; the above raw materials, in synergy with modified diatomaceous earth, produce the upper and lower diatomaceous earth inorganic mineral slab blanks, which exert excellent and stable self-functions.

[0010] In the preparation of modified diatomaceous earth, organic impurities and moisture in the diatomaceous earth raw material are first removed by high-temperature calcination, and then water is added to form a slurry, which facilitates subsequent reactions. Next, polydimethyldiallylammonium chloride is used to treat the diatomaceous earth to obtain diatomaceous earth pretreated with amino-modified surfaces. This not only provides good binding sites for the subsequent loading of alumina sol and water glass, but also significantly reduces the amount of water adsorbed by the diatomaceous earth in extremely humid environments. This hydrophobic modification reduces the internal stress caused by hygroscopic expansion, which is beneficial to inhibiting the initiation and propagation of microcracks. Finally, through the synergistic effect of alumina sol and water glass, which fully act on the interior and surface of the diatomaceous earth channels, the alumina sol provides a rigid framework and the water glass provides flexible connections, forming a dense composite network structure adhesive layer that is both rigid and flexible. This layer can effectively block the penetration of water molecules and effectively resist the stress changes caused by frequent temperature changes, preventing the propagation of internal microcracks and significantly improving the interfacial bonding stability between the modified diatomaceous earth and other raw materials. Therefore, the application of modified diatomaceous earth can significantly reduce the adverse effects of frequent temperature changes in extremely humid environments, thereby improving the moisture-proof stability and durability of diatomaceous earth inorganic mineral boards.

[0011] Preferably, in the preparation of the modified diatomaceous earth, in step S2, the weight ratio of diatomaceous earth to polydimethyldiallylammonium chloride in the diatomaceous earth slurry is (45-55):1.

[0012] By adopting the above technical solution, polydimethyldiallylammonium chloride can fully act on diatomaceous earth through electrostatic interaction. It will not result in insufficient modification due to insufficient dosage, nor will it cause excessive accumulation of polymer in the pores and blockage due to excessive dosage. In this way, it provides good binding sites for the subsequent loading of aluminum sol and water glass, and exerts a better effect.

[0013] Preferably, in the preparation of the modified diatomaceous earth, in step S3, the weight ratio of the pretreated diatomaceous earth mixed with aluminum sol and water glass is 1:(0.1-0.3):(0.05-0.15).

[0014] By adopting the above technical solution, when the ratio of aluminum sol and water glass is lower than the above range, it cannot fully act on diatomaceous earth, while when it is higher than the above range, it is easy to accumulate excessively in the pores of diatomaceous earth, blocking the pores. At the above ratio, the synergistic effect of aluminum sol and water glass can fully act on the inside and surface of diatomaceous earth pores, and the resulting composite network structure adhesive layer can also play a stable and better role, while maintaining the good porous structure of diatomaceous earth.

[0015] Preferably, in the preparation of the modified diatomaceous earth, in step S3, the solid content of the aluminum sol is 20-25%, and the particle size is 10-20 nm.

[0016] By adopting the above technical solution, when the aluminum sol is applied, it can not only achieve uniform distribution within the pores of diatomaceous earth and improve the consistency of the modification effect, but also exert an excellent synergistic effect with water glass. At the same time, it ensures that the pores will not be blocked due to excessive particle size, nor will an effective protective layer be unable to be formed due to excessive particle size, thus facilitating the obtaining of modified diatomaceous earth with excellent and stable application quality.

[0017] Preferably, in the preparation of the modified diatomaceous earth, in step S3, the water glass has a solid content of 40-50%, a modulus of 2.6-2.8, and a particle size of 1-10 nm.

[0018] By adopting the above technical solution, the water glass is less prone to sedimentation and aggregation during application, thus enabling it to fully penetrate into the microporous structure of diatomaceous earth and exert an excellent synergistic effect with aluminum sol. Ultimately, a uniform composite network structure adhesive layer is formed on the surface of the pores, which is beneficial for obtaining modified diatomaceous earth with excellent and stable application quality.

[0019] Preferably, in the preparation of the modified diatomite, in step S1, the porosity of the diatomite raw material is 80-90%, and the pore size of the microporous structure is 100-300 nm.

[0020] By adopting the above technical solution, a porosity of 80-90% means that diatomaceous earth has a huge specific surface area and rich pore structure, which can provide sufficient loading space for the raw materials used in the modification process; while the pore size of the microporous structure is 100-300nm, which can ensure that diatomaceous earth can still maintain a certain degree of air permeability after modification, so that diatomaceous earth boards have good "breathing" function; thus, it is beneficial to obtain high-quality diatomaceous earth inorganic mineral boards for furniture manufacturing.

[0021] Preferably, the mesh balance layer is an alkali-resistant glass fiber mesh.

[0022] By adopting the above technical solutions, alkali-resistant glass fiber mesh has the characteristics of high strength and high modulus. When the board is subjected to external force, the mesh can effectively disperse stress, prevent the board from cracking and deforming, and significantly improve the overall mechanical properties, durability, dimensional stability and processability of the board. At the same time, alkali-resistant glass fiber mesh can resist the corrosion of alkaline substances, provide alkali-resistant protection, and extend the service life of the board.

[0023] Preferably, the density of the upper and lower diatomaceous earth inorganic mineral slab blanks after molding is 700-800 kg / m³. 3 .

[0024] By adopting the above technical solution, 700-800 kg / m 3Its density is much lower than that of traditional gypsum board and cement board, which can significantly reduce the structural load of buildings, facilitate transportation and installation, and make construction convenient; while maintaining its lightweight nature, the resulting board can directly replace traditional MDF and particleboard in the fields of panel furniture, cabinets, bathroom vanities, etc., providing the market with a brand-new green, healthy and safe option.

[0025] Secondly, this application provides a method for preparing diatomaceous earth inorganic mineral boards for furniture manufacturing, using the following technical solution: A method for preparing diatomaceous earth inorganic mineral boards for furniture manufacturing includes the following steps: (1) Prepare raw materials containing modified diatomaceous earth, cement, quicklime, pulp fiber, quartz powder, hemihydrate gypsum, nano titanium dioxide, antibacterial agent and pigment according to the proportion; (2) After mixing the modified diatomaceous earth, cement, quicklime, pulp fiber, quartz powder, hemihydrate gypsum, nano titanium dioxide, antibacterial agent and pigment in step (1), add water and continue stirring to obtain a plastic blank. (3) The plastic billet obtained in step (2) is extruded into a slab and used as the upper diatomite inorganic mineral slab blank and the lower diatomite inorganic mineral slab blank respectively. Then, a mesh cloth balance layer is laid between the upper diatomite inorganic mineral slab blank and the lower diatomite inorganic mineral slab blank to obtain a three-layer pre-composite material. (4) The three-layer pre-composite material obtained in step (3) is sent to a cold press for cold pressing and initial composite, then demolded and steamed, and then dried, sanded to a fixed thickness and cut to obtain diatomaceous earth inorganic mineral board for furniture manufacturing.

[0026] By adopting the above technical solution, the above preparation method is simple to operate. After the raw materials are simply mixed, they can fully interact with each other, thereby obtaining diatomaceous earth inorganic mineral boards with excellent and stable application quality for furniture manufacturing. The whole is also suitable for large-scale industrial production.

[0027] In summary, this application has the following beneficial effects: This application applies specially prepared modified diatomaceous earth to the upper and lower diatomaceous earth inorganic mineral board blanks, and combines the upper diatomaceous earth inorganic mineral board blank, the mesh cloth balancing layer, and the lower diatomaceous earth inorganic mineral board blank to prepare diatomaceous earth inorganic mineral board for furniture manufacturing. This significantly reduces the adverse effects of frequent temperature changes in extremely humid environments, thereby improving the moisture-proof stability and durability of the diatomaceous earth inorganic mineral board. Detailed Implementation

[0028] The present application will be further described in detail below with reference to preparation examples, embodiments and comparative examples.

[0029] Unless otherwise specified, all raw materials used in the preparation examples, embodiments and comparative examples of this application are commercially available.

[0030] The diatomaceous earth was purchased from Lingshou County Wanzhu Mineral Products Co., Ltd. as building insulation material diatomaceous earth. It is a white powder with a specification of 200 mesh. The cement was purchased from Shuangshi Mineral Products Processing Plant in Lingshou County. It was white silicate cement, P.W42.5 white cement. The pulp fiber was purchased from Wuhan Runxingyuan Technology Co., Ltd. as QSC-wood fiber A; The quartz powder was purchased from refined quartz sand of Wanzhu Mineral Products Co., Ltd. in Lingshou County. The size was 60 mesh and the SiO2 content was 99.5%. Nano-titanium dioxide was purchased from Evonik Aeroxide TiO2P25 industrial-grade hydrophilic nano-titanium dioxide photocatalyst produced via vapor phase synthesis. The antibacterial agent was purchased from Hangzhou Wanjing TA33AG nano silver antibacterial agent; The pigment was purchased from Lingshou County Wanzhu Mineral Products Co., Ltd. as iron oxide red, with a specification of 325 mesh. The alkali-resistant fiberglass mesh was purchased from Zhuzhou Longgang Fiberglass Co., Ltd., with a specification of 9 mesh, a weight of 75 grams per square meter, and the item number LG0721.

[0031] Preparation examples of raw materials and / or intermediates Preparation Example 1 A modified diatomaceous earth is prepared by the following steps: S1. After calcining the diatomaceous earth raw material at 350℃ for 3 hours, cool it to 25℃, and then add water to mix it to obtain diatomaceous earth slurry. The ratio of diatomaceous earth to water is 1kg:4L. S2. Polydimethyldiallylammonium chloride is added to the diatomaceous earth slurry obtained in step S1, heated to 80°C and stirred for 2 hours. After filtration and drying, pretreated diatomaceous earth is obtained. S3. After mixing the pretreated diatomaceous earth obtained in step S2 with aluminum sol and water glass, the mixture is heated to 90°C and stirred for 1.5 hours. Then, it is subjected to vacuum impregnation for 30 minutes. After filtration and drying, modified diatomaceous earth is obtained.

[0032] Note: In step S1, the porosity of the diatomaceous earth raw material is 85%, and the pore size of the microporous structure is 200 nm. In step S2, the weight ratio of diatomaceous earth to polydimethyldiallylammonium chloride in the diatomaceous earth slurry is 50:1. In step S3, the weight ratio of pretreated diatomaceous earth to alumina sol and water glass is 1:0.2:0.1; the solid content of alumina sol is 22.5%, and the particle size is 15 nm; the solid content of water glass is 45%, the modulus is 2.7, and the particle size is 5.5 nm.

[0033] Preparation Example 2 A modified diatomaceous earth, which differs from the preparation example in that, in step S1, the porosity of the diatomaceous earth raw material is 80%, and the pore size of the microporous structure is 100 nm.

[0034] Preparation Example 3 A modified diatomaceous earth, which differs from the preparation example in that, in step S1, the porosity of the diatomaceous earth raw material is 90%, and the pore size of the microporous structure is 300 nm.

[0035] Preparation Example 4 A modified diatomaceous earth, which differs from the preparation example in that, in step S2, the weight ratio of diatomaceous earth to polydimethyldiallylammonium chloride in the diatomaceous earth slurry is 45:1.

[0036] Preparation Example 5 A modified diatomaceous earth, which differs from the preparation example in that, in step S2, the weight ratio of diatomaceous earth to polydimethyldiallylammonium chloride in the diatomaceous earth slurry is 55:1.

[0037] Preparation Example 6 A modified diatomaceous earth, which differs from the preparation example in that, in step S3, the weight ratio of the pretreated diatomaceous earth to the aluminum sol and water glass is 1:0.1:0.05.

[0038] Preparation Example 7 A modified diatomaceous earth, which differs from the preparation example in that, in step S3, the weight ratio of the pretreated diatomaceous earth to the aluminum sol and water glass is 1:0.3:0.15.

[0039] Preparation Example 8 A modified diatomaceous earth, which differs from the preparation example in that, in step S3, the solid content of the aluminum sol is 20% and the particle size is 10 nm.

[0040] Preparation Example 9 A modified diatomaceous earth, which differs from the preparation example in that, in step S3, the solid content of the aluminum sol is 25% and the particle size is 20 nm.

[0041] Preparation Example 10 A modified diatomaceous earth, which differs from the preparation example in that, in step S3, the water glass has a solid content of 40%, a modulus of 2.6, and a particle size of 1 nm.

[0042] Preparation Example 11 A modified diatomaceous earth, which differs from the preparation example in that, in step S3, the water glass has a solid content of 50%, a modulus of 2.8, and a particle size of 10 nm.

[0043] Preparation Example 12 A modified diatomaceous earth, which differs from the preparation example in that aluminum sol is not used in step S3.

[0044] Preparation Example 13 A modified diatomaceous earth, which differs from the preparation example in that water glass is not used in step S3.

[0045] Example 1 A diatomaceous earth inorganic mineral board for furniture manufacturing is prepared by composite material comprising an upper diatomaceous earth inorganic mineral board blank, a mesh cloth balancing layer, and a lower diatomaceous earth inorganic mineral board blank; specifically, the preparation steps are as follows: (1) Prepare raw materials containing modified diatomaceous earth, cement, quicklime, pulp fiber, quartz powder, hemihydrate gypsum, nano titanium dioxide, antibacterial agent and pigment according to the proportion; (2) After mixing the modified diatomaceous earth, cement, quicklime, pulp fiber, quartz powder, hemihydrate gypsum, nano titanium dioxide, antibacterial agent and pigment in step (1), add water and continue stirring to obtain a plastic blank with a water content of 25%. (3) The plastic billet obtained in step (2) is extruded into a slab and used as the upper diatomite inorganic mineral slab blank and the lower diatomite inorganic mineral slab blank respectively. Then, a mesh cloth balance layer is laid between the upper diatomite inorganic mineral slab blank and the lower diatomite inorganic mineral slab blank to obtain a three-layer pre-composite material. (4) The three-layer pre-composite material obtained in step (3) is sent to a cold press for cold pressing and initial composite, then demolded and steamed at 90°C for 12 hours, then dried to a moisture content of 2.5%, and then sanded with a thickness sander and cut with an edge trimmer to obtain diatomaceous earth inorganic mineral board for furniture manufacturing.

[0046] Note: In the above operations, the upper and lower diatomaceous earth inorganic mineral slab blanks are made of the same material, and their raw materials and corresponding weights are shown in Table 1. The mesh balance layer is an alkali-resistant glass fiber mesh. The upper and lower diatomaceous earth inorganic mineral slab blanks are set with equal thickness, and the density after molding is 750 kg / m³. 3 The modified diatomaceous earth used was obtained from Preparation Example 1.

[0047] Example 2-3 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the raw materials for preparing the upper and lower diatomaceous earth inorganic mineral board blanks and their corresponding weights are shown in Table 1.

[0048] Table 1. Raw materials and their weight parts (kg / part) for the preparation of upper and lower diatomaceous earth inorganic mineral slab blanks in Examples 1-3. Example 4 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the density of the upper and lower diatomaceous earth inorganic mineral board blanks after molding is 700 kg / m³. 3 .

[0049] Example 5 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the density of the upper and lower diatomaceous earth inorganic mineral board blanks after molding is 800 kg / m³. 3 .

[0050] Example 6 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 2.

[0051] Example 7 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 3.

[0052] Example 8 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 4.

[0053] Example 9 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 5.

[0054] Example 10 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 6.

[0055] Example 11 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 7.

[0056] Example 12 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 8.

[0057] Example 13 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 9.

[0058] Example 14 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 10.

[0059] Example 15 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 11.

[0060] Comparative Example Comparative Example 1 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 12.

[0061] Comparative Example 2 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that the modified diatomaceous earth is obtained from Preparation Example 13.

[0062] Comparative Example 3 A diatomaceous earth inorganic mineral board for furniture manufacturing differs from Example 1 in that modified diatomaceous earth is replaced by diatomaceous earth raw material.

[0063] Performance testing Test samples: The diatomaceous earth inorganic mineral boards for furniture manufacturing obtained in Examples 1-15 were used as test samples 1-15, and the diatomaceous earth inorganic mineral boards for furniture manufacturing obtained in Comparative Examples 1-3 were used as control samples 1-3. The specifications of the diatomaceous earth inorganic mineral boards for furniture manufacturing were 1220mm×2440mm×18mm.

[0064] Test method: Take diatomaceous earth inorganic mineral board used for furniture manufacturing and test its water absorption rate according to the contents of GB / T 17657-2013 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels". The obtained water absorption rate value is recorded as A1. Then, the same type of diatomaceous earth inorganic mineral board used for furniture manufacturing was placed in a space with constant relative humidity (95%). Then, a temperature change of 5-40℃ was applied at a rate of 2.5℃ / min for 10 cycles. After that, the diatomaceous earth inorganic mineral board used for furniture manufacturing was taken out and dried, and the water absorption rate was measured in the same way. The obtained water absorption rate value was recorded as A2. Finally, calculate the percentage increase in water absorption rate (%). The percentage increase in water absorption rate = (A2-A1) / A1. The larger the percentage increase in water absorption rate, the greater the impact of temperature changes on the diatomaceous earth inorganic mineral board used for furniture manufacturing in extremely humid environments, and the worse the overall moisture-proof stability and durability.

[0065] After performing the above tests on test samples 1-15 and control samples 1-3, the test results are recorded in Table 2.

[0066] Table 2 Test results of test samples 1-15 and control samples 1-3 As can be seen from Example 1 and Comparative Examples 1-3, and Table 2, this application, by applying specially prepared modified diatomaceous earth to upper and lower diatomaceous earth inorganic mineral board blanks, and combining the upper diatomaceous earth inorganic mineral board blank, the mesh cloth balancing layer, and the lower diatomaceous earth inorganic mineral board blank to prepare diatomaceous earth inorganic mineral board for furniture manufacturing, shows a significant decrease in the percentage increase in water absorption rate after the above tests. Furthermore, it was found that if either aluminum sol or water glass is missing in the preparation of the modified diatomaceous earth, the percentage increase in water absorption rate significantly increases. From the above test data, it is clear that the two components have a synergistic effect, thus significantly reducing the adverse effects of frequent temperature changes in extremely humid environments after the application of the modified diatomaceous earth, thereby improving the moisture-proof stability and durability of the diatomaceous earth inorganic mineral board.

[0067] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A diatomaceous earth inorganic mineral board for furniture manufacturing, characterized in that, It is prepared by combining an upper diatomaceous earth inorganic mineral plate blank, a mesh cloth balancing layer, and a lower diatomaceous earth inorganic mineral plate blank; the upper and lower diatomaceous earth inorganic mineral plate blanks are made of the same material and are made from raw materials containing the following parts by weight: 30-60 parts of modified diatomaceous earth; 10-30 parts cement; 15-25 parts of slaked lime; 6-10 parts pulp fiber; Quartz powder 0.1-20 parts; 1-5 parts of hemihydrate gypsum; 0.5-1.5 parts of nano-titanium dioxide; Antibacterial agent 0.01-0.1 parts; Pigment 0.1-0.3 parts; The modified diatomaceous earth was prepared through the following steps: S1. After roasting the diatomaceous earth raw material, cool it and then mix it with water to obtain diatomaceous earth slurry. S2. Polydimethyldiallylammonium chloride is added to the diatomaceous earth slurry obtained in step S1. After heating and stirring to react, the mixture is filtered and dried to obtain pretreated diatomaceous earth. S3. After mixing the pretreated diatomaceous earth obtained in step S2 with aluminum sol and water glass, the mixture is heated and stirred to react, then vacuum impregnated, and finally filtered and dried to obtain modified diatomaceous earth.

2. The diatomaceous earth inorganic mineral board for furniture manufacturing according to claim 1, characterized in that: In the preparation of the modified diatomaceous earth, in step S2, the weight ratio of diatomaceous earth to polydimethyldiallylammonium chloride in the diatomaceous earth slurry is (45-55):

1.

3. The diatomaceous earth inorganic mineral board for furniture manufacturing according to claim 1, characterized in that: In the preparation of the modified diatomite, in step S3, the weight ratio of the pretreated diatomite mixed with aluminum sol and water glass is 1:(0.1-0.3):(0.05-0.15).

4. The diatomaceous earth inorganic mineral board for furniture manufacturing according to claim 1, characterized in that: In the preparation of the modified diatomaceous earth, in step S3, the solid content of the aluminum sol is 20-25%, and the particle size is 10-20 nm.

5. The diatomaceous earth inorganic mineral board for furniture manufacturing according to claim 1, characterized in that: In the preparation of the modified diatomite, in step S3, the water glass has a solid content of 40-50%, a modulus of 2.6-2.8, and a particle size of 1-10 nm.

6. The diatomaceous earth inorganic mineral board for furniture manufacturing according to claim 1, characterized in that: In the preparation of the modified diatomite, in step S1, the porosity of the diatomite raw material is 80-90%, and the pore size of the microporous structure is 100-300 nm.

7. The diatomaceous earth inorganic mineral board for furniture manufacturing according to claim 1, characterized in that: The mesh balance layer is an alkali-resistant glass fiber mesh.

8. The diatomaceous earth inorganic mineral board for furniture manufacturing according to claim 1, characterized in that: The density of the upper and lower diatomaceous earth inorganic mineral slab blanks after molding is 700-800 kg / m³. 3 .

9. The method for preparing diatomaceous earth inorganic mineral boards for furniture manufacturing according to claim 1, characterized in that: Includes the following steps: (1) Prepare raw materials containing modified diatomaceous earth, cement, quicklime, pulp fiber, quartz powder, hemihydrate gypsum, nano titanium dioxide, antibacterial agent and pigment according to the proportion; (2) After mixing the modified diatomaceous earth, cement, quicklime, pulp fiber, quartz powder, hemihydrate gypsum, nano titanium dioxide, antibacterial agent and pigment in step (1), add water and continue stirring to obtain a plastic blank. (3) The plastic billet obtained in step (2) is extruded into a slab and used as the upper diatomite inorganic mineral slab blank and the lower diatomite inorganic mineral slab blank respectively. Then, a mesh cloth balance layer is laid between the upper diatomite inorganic mineral slab blank and the lower diatomite inorganic mineral slab blank to obtain a three-layer pre-composite material. (4) The three-layer pre-composite material obtained in step (3) is sent to a cold press for cold pressing and initial composite, then demolded and steamed, and then dried, sanded to a fixed thickness and cut to obtain diatomaceous earth inorganic mineral board for furniture manufacturing.

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