High-temperature-resistant waterproof polyvinyl chloride furniture board and preparation process thereof

Abstract

The invention relates to the technical field of polyvinyl chloride boards, and discloses a high-temperature-resistant waterproof polyvinyl chloride furniture board and a preparation process thereof. The polyvinyl chloride furniture board is prepared from polyvinyl chloride resin, modified shell powder, modified hydrotalcite, a plasticizer, an auxiliary plasticizer, an antioxidant, a lubricant and color master batch through melt blending and hot pressing. The modified shell powder is prepared by grafting and copolymerizing oleic acid modified shell powder with methyl methacrylate; the modified hydrotalcite is prepared from oleic acid modified carbonate hydrotalcite; the polyvinyl chloride furniture board is prepared from the following components in parts by mass: 100 to 120 parts of polyvinyl chloride resin, 40 to 50 parts of modified shell powder, 3 to 5 parts of modified hydrotalcite, 5 to 8 parts of plasticizer, 2 to 5 parts of auxiliary plasticizer, 3 to 5 parts of antioxidant, 2 to 5 parts of lubricant and 15 to 20 parts of color master batch.

Description

Technical Field

[0001] The invention relates to the technical field of polyvinyl chloride sheets, in particular to a high-temperature resistant and waterproof polyvinyl chloride furniture sheet and a preparation process thereof. Background Art

[0002] Polyvinyl chloride (PVC), a key material made from the polymerization of vinyl chloride monomer, holds an indispensable position in numerous industries thanks to its excellent flame retardancy, mechanical properties, and chemical resistance. With the continued advancement of industry, PVC production has steadily increased, and it is widely used in the chemical, petroleum, electroplating, water purification equipment, environmental protection equipment, mining, medicine, electronics, communications, and interior decoration industries.

[0003] However, PVC materials have inherent defects in the polymerization process. The polymerization reaction produces a large number of molecular isomers and weak structures, which makes the PVC material brittle and easily broken when subjected to external force impact, limiting its application in scenarios with high requirements for material toughness. At the same time, PVC has poor heat resistance. When the temperature rises, the interaction force between the molecular chains weakens, and the material easily softens and deforms. For example, when the indoor temperature is high or close to a heat source, furniture and decorative lines made of PVC sheets may change shape and become unstable in size, seriously affecting the use effect and aesthetics. These shortcomings greatly affect the comprehensive performance of PVC materials in actual use, making it often difficult to directly meet the needs of various application scenarios, and usually require further modification.

[0004] With the improvement of people's quality of life and the increasingly stringent requirements for material performance in various industries, the development of PVC sheets with both high-temperature resistance and antibacterial properties has become an urgent issue. This will not only expand the application range of PVC materials and meet the needs of the high-end market, but also promote technological progress and sustainable development in related industries. Summary of the Invention

[0005] The object of the present invention is to provide a high-temperature resistant and waterproof polyvinyl chloride furniture board and a preparation process thereof, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A high-temperature resistant and waterproof polyvinyl chloride furniture board, which is prepared by melt blending and hot pressing polyvinyl chloride resin, modified shell powder, modified hydrotalcite, plasticizer, auxiliary plasticizer, antioxidant, lubricant, and masterbatch; Furthermore, the modified shell powder is prepared by graft copolymerization of oleic acid modified shell powder with methyl methacrylate; Furthermore, the modified hydrotalcite is prepared by modifying carbonate hydrotalcite with oleic acid.

[0007] Furthermore, the polyvinyl chloride model is SG-8; Furthermore, the amounts of the components of the polyvinyl chloride furniture board, by mass, are 100-120 parts of polyvinyl chloride resin, 40-50 parts of modified shell powder, 3-5 parts of modified hydrotalcite, 5-8 parts of plasticizer, 2-5 parts of auxiliary plasticizer, 3-5 parts of antioxidant, 2-5 parts of lubricant, and 15-20 parts of masterbatch.

[0008] Furthermore, the preparation method of the modified shell powder comprises the following steps: Step (1): adding shell powder, deionized water and oleic acid into a reaction vessel, stirring at room temperature for 2-3 hours, adding ammonia water, heating to 70-75°C for reaction for 4-4.5 hours, centrifuging, washing with 75% ethanol aqueous solution, and freeze-drying to obtain oleic acid-modified shell powder; Step (2): add oleic acid modified shell powder, polyvinyl chloride pyrrolidone, and ethanol aqueous solution into a reaction vessel, ultrasonically disperse for 2-3 hours under a nitrogen atmosphere, degas by vacuuming-nitrogen filling cycle, heat to 70-75°C, add methyl methacrylate and azobisisobutyronitrile, keep warm for reaction, centrifuge, wash, and vacuum freeze-dry to obtain modified shell powder.

[0009] Furthermore, in the preparation process of the oleic acid-modified shell powder, the amounts of deionized water, oleic acid, and ammonia water added per 15 g of shell powder are 50-60 mL, 1-1.5 mL, and 4-5 mL, respectively.

[0010] Furthermore, during the preparation of the modified shell powder, the mass ratio of oleic acid modified shell powder: polyvinyl chloride pyrrolidone: methyl methacrylate is 1:1.5:(3-5); the amount of azobisisobutyronitrile added is 0.5-0.6wt% of the mass of methyl methacrylate.

[0011] Furthermore, the preparation method of the modified hydrotalcite comprises the following steps: Lanthanum nitrate hexahydrate, magnesium nitrate hexahydrate, and aluminum nitrate nonahydrate are added to deionized water and stirred evenly to obtain solution A; sodium hydroxide and sodium bicarbonate are added to deionized water and stirred evenly to obtain solution B; solution A is added to a reaction vessel, preheated to 70-75°C, and solution B is added dropwise. After the addition is completed, the mixture is kept warm for 8-9 hours, further heated to 170-175°C for 4-5 hours, filtered, and the product is washed with deionized water and vacuum dried at 80-85°C to obtain carbonate hydrotalcite; the carbonate hydrotalcite is added to a methanol solution of oleic acid, heated to 70-72°C for 24 hours, centrifuged, washed, and vacuum dried to obtain modified hydrotalcite.

[0012] Furthermore, the amounts of the components in solution A, by mass, are 0.445 g of lanthanum nitrate hexahydrate, 8.46 g of magnesium nitrate hexahydrate, and 3.69 g of aluminum nitrate nonahydrate; the amounts of the components in solution B, by mass, are 4 g of sodium hydroxide and 0.475 g of sodium bicarbonate; and in the preparation process of the modified hydrotalcite, the molar ratio of carbonate hydrotalcite: oleic acid is 1:(6-9).

[0013] Furthermore, the dropwise addition rate of solution B was 5 mL / min; Furthermore, the preparation method of the plasticizer comprises the following steps: ε-caprolactone, dipentaerythritol, and stannous 2-ethylhexanoate were added to a reaction vessel, degassed by vacuum-nitrogen cycle, heated to 120-125° C. under a nitrogen atmosphere for 24 hours, and the product was transferred to an ice bath to terminate the reaction. The product was dissolved in dichloromethane and poured into icy methanol for purification to obtain a plasticizer; During the preparation of the plasticizer, the molar ratio of ε-caprolactone: dipentaerythritol: stannous 2-ethylhexanoate is 100: (1.66-1.74): (0.5-0.52).

[0014] Furthermore, the preparation method of the auxiliary plasticizer comprises the following steps: Step (1): formic acid and hydrogen peroxide are mixed uniformly at room temperature to obtain a mixture A; linseed oil is added to a reaction vessel, preheated to 60-65°C, and mixture A is added three times at intervals of 3 hours each time. After the addition is completed, the mixture is kept warm for 4-5 hours, the product is dissolved in ethyl acetate, and washed with deionized water, 2 wt% sodium bicarbonate aqueous solution, and sodium chloride aqueous solution to a pH of 7.0 in sequence. The organic layer is dried with anhydrous magnesium sulfate, rotary evaporated, and vacuum dried at 60-65°C for 12 hours to obtain epoxidized linseed oil; Step (2): adding epoxidized linseed oil, butyric acid, and toluene to a reaction vessel, heating to 100-105°C, and reflux reaction for 4-8 hours under a nitrogen atmosphere, dissolving the product in ethyl acetate, washing with deionized water, 2 wt% sodium bicarbonate aqueous solution, and sodium chloride aqueous solution in sequence until the pH reaches 7.0, drying the organic layer with anhydrous magnesium sulfate, rotary evaporation, and vacuum drying at 60-65°C for 12 hours to obtain butyric acid-modified linseed oil; Step (3): adding butyric acid-modified linseed oil, ε-caprolactone, and stannous octoate into a reaction vessel, heating to 110-115°C, reacting for 10-12 hours under a nitrogen atmosphere, dissolving the product in tetrahydrofuran, pouring into petroleum ether for precipitation, collecting the precipitate, and vacuum drying at 40-45°C for 12 hours to obtain an auxiliary plasticizer; During the preparation of epoxidized linseed oil, the molar ratio of linseed oil:formic acid:hydrogen peroxide is 79.7:159:1000; during the preparation of butyric acid-modified linseed oil, the molar ratio of epoxidized linseed oil:butyric acid is 2.9:68.1; during the preparation of the auxiliary plasticizer, the mass ratio of butyric acid-modified linseed oil:ε-caprolactone is 1:3; and the amount of stannous octoate added is 0.27-3wt% of the mass of ε-caprolactone.

[0015] A preparation process for high-temperature resistant and waterproof polyvinyl chloride furniture panels, characterized by comprising the following steps: adding polyvinyl chloride resin, modified shell powder, modified hydrotalcite, plasticizer, auxiliary plasticizer, antioxidant, lubricant, and masterbatch into a mixer in sequence, melt-blending at 150-160° C., maintaining the mixture at 150° C. for 5 minutes as a preheating step, and hot-pressing at a pressure of 10 MPa for 5-6 minutes to obtain the polyvinyl chloride furniture panels.

[0016] Furthermore, the shell powder has a calcium carbonate content of ≥90%; Furthermore, the shell powder needs to be ground and sieved before use.

[0017] Furthermore, the antioxidant is any one of antioxidant 1010, antioxidant 168, and antioxidant 1098; Furthermore, the lubricant is any one of paraffin wax, polyvinyl chloride wax, and oxidized polyvinyl chloride wax.

[0018] Furthermore, the masterbatch carrier is polyvinyl chloride, and the color is any one of white, red, yellow, and blue.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are: The present invention reduces surface polarity and hydrophilic groups by treating the surfaces of modified shell powder and hydrotalcite with oleic acid, thereby forming a stronger interfacial bond with the PVC matrix. A melt blending and hot pressing process promotes uniform distribution of the components, forming a dense, non-porous structure that blocks water penetration and improves the waterproof properties of the PVC furniture board. Oleic acid carboxylic acid groups react with hydroxyl groups on the surface of the shell powder to form a hydrophobic layer, reducing agglomeration. Methyl methacrylate is grafted onto the shell powder through free radical polymerization to form a flexible coating that is miscible with the PVC chain segments and enhances interfacial bonding. Furthermore, the evenly dispersed modified shell powder acts as a physical crosslinking point, restricting the movement of the PVC molecular chains and increasing the elastic modulus and tensile strength. When cracks propagate, the filler interface absorbs energy, delaying fracture and significantly improving the mechanical properties of the PVC furniture board.

[0020] The carbonate ions between the hydrotalcite layers react with the HCl produced by PVC degradation, generating chloride and releasing CO2, inhibiting dechlorination reactions exacerbated by acidic environments. Oleic acid modification increases interlayer space, enhancing HCl adsorption capacity while forming hydrogen bonds with polar groups in PVC, stabilizing the interface. Furthermore, metal ions such as Mg²⁺ and Al³⁺ in the hydrotalcite bind to conjugated double bonds in the PVC chains, inhibiting the formation of polyene structures, slowing discoloration and strength loss, and improving the thermal stability of PVC furniture panels. Because the modified shell powder and modified hydrotalcite have similar surface segment structures, their interaction during melt blending of PVC resin further enhances their dispersion in the matrix and interfacial compatibility.

[0021] The present invention further utilizes the synergistic effect of plasticizers and auxiliary plasticizers. The main plasticizer (ε-caprolactone derivative) is inserted into the PVC molecules through long-chain alkyl groups to reduce intermolecular forces and lower the glass transition temperature. The auxiliary plasticizer (butyric acid-modified linseed oil) contains epoxy groups, which form hydrogen bonds with the Cl atoms of PVC, enhancing compatibility and reducing plasticizer migration. At the same time, the ester group of the auxiliary plasticizer forms physical crosslinks with the polar groups of PVC, improving the shape retention ability at high temperatures. The plasticizer prepared by the present invention has a specific star structure, forms a stable network through chain entanglement, and further improves the high-temperature resistance of polyvinyl chloride furniture panels. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0023] Example 1: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S1: adding 15 g of shell powder, 50 mL of deionized water, and 1 mL of oleic acid to a reaction vessel, stirring at room temperature for 2 h, adding 4 mL of ammonia water, heating to 70° C. for 4 h, centrifuging, washing with 75% ethanol aqueous solution, and freeze-drying to obtain oleic acid-modified shell powder; S2: 1 g of oleic acid-modified shell powder, 1.5 g of polyvinyl chloride pyrrolidone, and an ethanol aqueous solution were added to a reaction vessel, and ultrasonically dispersed for 2 h under a nitrogen atmosphere. The mixture was degassed by vacuum-nitrogen cycle, heated to 70°C, and 3 g of methyl methacrylate and azobisisobutyronitrile were added. The mixture was kept warm for reaction, centrifuged, washed, and vacuum freeze-dried to obtain the modified shell powder. S3: 0.445 g of lanthanum nitrate hexahydrate, 8.46 g of magnesium nitrate hexahydrate, and 3.69 g of aluminum nitrate nonahydrate were added to deionized water and stirred to obtain solution A; 4 g of sodium hydroxide and 0.475 g of sodium bicarbonate were added to deionized water and stirred to obtain solution B; solution A was added to a reaction vessel, preheated to 70°C, and solution B was added dropwise at 5 mL / min. After the addition was completed, the mixture was kept warm for 8 hours, further heated to 170°C for 4 hours, filtered, washed with deionized water, and dried in vacuo at 80°C to obtain carbonate hydrotalcite; 1 mmol of carbonate hydrotalcite was added to a methanol solution of 6 mmol of oleic acid, heated to 70°C for 24 hours, centrifuged, washed, and dried in vacuo to obtain modified hydrotalcite; S4: 100 mmol of ε-caprolactone, 1.66 mmol of dipentaerythritol, and 0.5 mmol of stannous 2-ethylhexanoate were added to a reaction vessel, and the mixture was degassed by vacuum-nitrogen cycle. The mixture was heated to 120° C. under a nitrogen atmosphere for 24 h, and the reaction was terminated by transferring the product to an ice bath. The product was dissolved in dichloromethane and purified by pouring into icy methanol to obtain a plasticizer. S5: 159 mmol formic acid and 1000 mmol hydrogen peroxide were mixed at room temperature to obtain a mixture A; 79.7 mmol linseed oil was added to a reaction vessel, preheated to 60°C, and the mixture A was added three times with an interval of 3 hours each time. After the addition was completed, the mixture was kept warm for 4 hours. The product was dissolved in ethyl acetate, washed with deionized water, 2 wt% sodium bicarbonate aqueous solution, and sodium chloride aqueous solution in sequence to a pH of 7.0. The organic layer was dried over anhydrous magnesium sulfate, rotary evaporated, and vacuum dried at 60°C for 12 hours to obtain epoxidized linseed oil; S6: 2.9 mmol of epoxidized linseed oil, 68.1 mmol of butyric acid, and toluene were added to a reaction vessel, heated to 100°C, and refluxed under a nitrogen atmosphere for 4 h. The product was dissolved in ethyl acetate, washed with deionized water, a 2 wt% aqueous sodium bicarbonate solution, and a sodium chloride solution to a pH of 7.0, and the organic layer was dried over anhydrous magnesium sulfate, rotary evaporated, and vacuum dried at 60°C for 12 h to obtain butyric acid-modified linseed oil. S7: 1 g of butyric acid-modified linseed oil, 3 g of ε-caprolactone, and stannous octoate were added to a reaction vessel, heated to 110° C., and reacted under a nitrogen atmosphere for 10 h. The product was dissolved in tetrahydrofuran and poured into petroleum ether for precipitation. The precipitate was collected and vacuum-dried at 40° C. for 12 h to obtain an auxiliary plasticizer. S8: 100 parts of polyvinyl chloride resin, 40 parts of modified shell powder, 3 parts of modified hydrotalcite, 5 parts of plasticizer, 2 parts of auxiliary plasticizer, 3 parts of antioxidant, 2 parts of lubricant and 15 parts of masterbatch are added into a mixer in sequence, melt-blended at 150°C, and the mixture is kept at 150°C for 5 minutes as a preheating step, and hot-pressed at a pressure of 10 MPa for 5 minutes to obtain polyvinyl chloride furniture board.

[0024] Example 2: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S2: adding 1 g of oleic acid-modified shell powder, 1.5 g of polyvinyl chloride pyrrolidone, and an ethanol aqueous solution to a reaction vessel, ultrasonically dispersing the mixture for 2 h under a nitrogen atmosphere, degassing the mixture through a vacuum-nitrogen filling cycle, heating the mixture to 70° C., adding 4 g of methyl methacrylate and azobisisobutyronitrile, maintaining the reaction temperature, centrifuging, washing, and vacuum freeze-drying the mixture to obtain the modified shell powder; The remaining steps are the same as those in Example 1.

[0025] Example 3: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S2: adding 1 g of oleic acid-modified shell powder, 1.5 g of polyvinyl chloride pyrrolidone, and an ethanol aqueous solution to a reaction vessel, ultrasonically dispersing for 2 h under a nitrogen atmosphere, degassing by vacuuming-nitrogen filling cycles, heating to 70° C., adding 5 g of methyl methacrylate and azobisisobutyronitrile, keeping the temperature for reaction, centrifuging, washing, and vacuum freeze-drying to obtain modified shell powder; The remaining steps are the same as those in Example 1.

[0026] Example 4: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S3: adding 0.445 g of lanthanum nitrate hexahydrate, 8.46 g of magnesium nitrate hexahydrate, and 3.69 g of aluminum nitrate nonahydrate to deionized water, stirring evenly to obtain solution A; adding 4 g of sodium hydroxide and 0.475 g of sodium bicarbonate to deionized water, stirring evenly to obtain solution B; adding solution A to a reaction vessel, preheating to 70° C., adding solution B dropwise at 5 mL / min, and after the addition is complete, keeping the temperature for reaction for 8 hours, further heating to 170° C. for reaction for 4 hours, filtering, washing the product with deionized water, and vacuum drying at 80° C. to obtain carbonate hydrotalcite; adding 1 mmol of carbonate hydrotalcite to a methanol solution of 9 mmol of oleic acid, heating to 70° C. for reaction for 24 hours, centrifuging, washing, and vacuum drying to obtain modified hydrotalcite; The remaining steps are the same as those in Example 3.

[0027] Comparative Example 1: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S2: adding 1 g of oleic acid-modified shell powder, 1.5 g of polyvinyl chloride pyrrolidone, and an ethanol aqueous solution to a reaction vessel, ultrasonically dispersing for 2 h under a nitrogen atmosphere, degassing through a vacuum-nitrogen filling cycle, heating to 70° C., adding 2 g of methyl methacrylate and azobisisobutyronitrile, keeping the reaction warm, centrifuging, washing, and vacuum freeze-drying to obtain modified shell powder; The remaining steps are the same as those in Example 1.

[0028] Comparative Example 2: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S2: adding 1 g of oleic acid-modified shell powder, 1.5 g of polyvinyl chloride pyrrolidone, and an ethanol aqueous solution to a reaction vessel, ultrasonically dispersing the mixture for 2 h under a nitrogen atmosphere, degassing the mixture through a vacuum-nitrogen filling cycle, heating the mixture to 70° C., adding 6 g of methyl methacrylate and azobisisobutyronitrile, maintaining the reaction temperature, centrifuging, washing, and vacuum freeze-drying the mixture to obtain the modified shell powder; The remaining steps are the same as those in Example 1.

[0029] Comparative Example 3: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S3: adding 0.445 g of lanthanum nitrate hexahydrate, 8.46 g of magnesium nitrate hexahydrate, and 3.69 g of aluminum nitrate nonahydrate to deionized water, stirring evenly to obtain solution A; adding 4 g of sodium hydroxide and 0.475 g of sodium bicarbonate to deionized water, stirring evenly to obtain solution B; adding solution A to a reaction vessel, preheating to 70° C., adding solution B dropwise at 5 mL / min, and after the addition is complete, keeping the temperature for reaction for 8 hours, further heating to 170° C. for reaction for 4 hours, filtering, washing the product with deionized water, and vacuum drying at 80° C. to obtain carbonate hydrotalcite; adding 1 mmol of carbonate hydrotalcite to a methanol solution of 4 mmol of oleic acid, heating to 70° C. for reaction for 24 hours, centrifuging, washing, and vacuum drying to obtain modified hydrotalcite; The remaining steps are the same as those in Example 1.

[0030] Comparative Example 4: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S3: adding 0.445 g of lanthanum nitrate hexahydrate, 8.46 g of magnesium nitrate hexahydrate, and 3.69 g of aluminum nitrate nonahydrate to deionized water, stirring evenly to obtain solution A; adding 4 g of sodium hydroxide and 0.475 g of sodium bicarbonate to deionized water, stirring evenly to obtain solution B; adding solution A to a reaction vessel, preheating to 70° C., adding solution B dropwise at 5 mL / min, and after the addition is complete, keeping the temperature for reaction for 8 hours, further heating to 170° C. for reaction for 4 hours, filtering, washing the product with deionized water, and vacuum drying at 80° C. to obtain carbonate hydrotalcite; adding 1 mmol of carbonate hydrotalcite to a methanol solution of 11 mmol of oleic acid, heating to 70° C. for reaction for 24 hours, centrifuging, washing, and vacuum drying to obtain modified hydrotalcite; The remaining steps are the same as those in Example 1.

[0031] Comparative Example 5: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S8: adding 100 parts of polyvinyl chloride resin, 40 parts of modified shell powder, 3 parts of modified hydrotalcite, 5 parts of plasticizer diisononyl phthalate, 2 parts of auxiliary plasticizer, 3 parts of antioxidant, 2 parts of lubricant, and 15 parts of masterbatch to a mixer in sequence, melt-blending at 150° C., maintaining the mixture at 150° C. for 5 minutes as a preheating step, and hot pressing at a pressure of 10 MPa for 5 minutes to obtain the polyvinyl chloride furniture board; The remaining steps are the same as those in Example 1.

[0032] Comparative Example 6: A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board, comprising the following steps: S8: adding 100 parts of polyvinyl chloride resin, 40 parts of modified shell powder, 3 parts of modified hydrotalcite, 7 parts of plasticizer, 3 parts of antioxidant, 2 parts of lubricant, and 15 parts of masterbatch to a mixer in sequence, melt-blending at 150° C., maintaining the mixture at 150° C. for 5 minutes as a preheating step, and hot-pressing at a pressure of 10 MPa for 5 minutes to obtain the polyvinyl chloride furniture board; The remaining steps are the same as those in Example 1.

[0033] The polyvinyl chloride furniture board prepared in the above examples and comparative examples has a thickness of 9 mm; In addition to the subsequent experimental part, the polyvinyl chloride furniture board prepared in Example 1 of the present invention was separately inspected according to market technical standards. The inspection data are shown in Table 1 below. Table 1 PVC furniture board test results

[0034] Conclusion: The polyvinyl chloride furniture board prepared by the present invention meets the market technical standard requirements.

[0035] Experiment: Tensile strength: Refer to GB / T 1040.1-2018 and use a universal material testing machine to test the tensile strength of polyvinyl chloride furniture panels. The operating temperature is 25°C and the tensile rate is 25 cm / min. Bending strength: Refer to GB / T 22789.2023 to test the bending strength of PVC furniture panels; Heat resistance: Refer to GB / T 1633-2000, with a heating rate of 50°C / h and a load of 5kg to test the Vicat softening temperature of PVC furniture panels.

[0036] The experimental test results are shown in Table 2 below. Table 2 Experimental test data of PVC furniture board

[0037] Conclusion: The polyvinyl chloride furniture board prepared by the present invention has excellent high temperature resistance and mechanical properties.

[0038] In the preparation process of the modified shell powder in Comparative Example 1, the amount of methyl methacrylate added was too small, resulting in insufficient surface modification and coating of the shell powder and reduced interfacial compatibility.

[0039] In the preparation process of the modified shell powder in comparative example 2, too much methyl methacrylate was added, resulting in phase separation of the modified polymer on the surface of the shell powder. Excessive addition is prone to agglomeration, which destroys the rigidity and toughness of the material.

[0040] In the preparation process of the modified hydrotalcite in Comparative Example 3, the amount of oleic acid added was too little, resulting in insufficient surface modification of the hydrotalcite, more crystal structure defects, and reduced compatibility and thermal stability.

[0041] In the preparation process of the modified hydrotalcite in Comparative Example 4, too much oleic acid was added, resulting in high-concentration oleic acid penetrating into the interlayers of the hydrotalcite during the modification process, causing lattice distortion, reduced crystallinity, and reduced compatibility and thermal stability.

[0042] In the preparation process of the polyvinyl chloride furniture board in Comparative Example 5, conventional diisononyl phthalate was used to replace the plasticizer prepared by the present invention, but the lack of synergistic effect resulted in reduced high temperature resistance and mechanical properties.

[0043] In the preparation process of the polyvinyl chloride furniture board in Comparative Example 6, a single plasticizer was used, and an auxiliary plasticizer was lacking. The lack of synergistic effect resulted in reduced high temperature resistance and mechanical properties.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A high temperature resistant and waterproof polyvinyl chloride furniture board, characterized by: The polyvinyl chloride furniture board is prepared by melt blending and hot pressing polyvinyl chloride resin, modified shell powder, modified hydrotalcite, plasticizer, auxiliary plasticizer, antioxidant, lubricant and masterbatch; The modified shell powder is prepared by graft copolymerization of oleic acid-modified shell powder with methyl methacrylate; The modified hydrotalcite is prepared by modifying carbonate hydrotalcite with oleic acid.

2. The high temperature resistant and waterproof polyvinyl chloride furniture board according to claim 1, characterized in that: The amounts of the components of the polyvinyl chloride furniture board, calculated by mass, include 100-120 parts of polyvinyl chloride resin, 40-50 parts of modified shell powder, 3-5 parts of modified hydrotalcite, 5-8 parts of plasticizer, 2-5 parts of auxiliary plasticizer, 3-5 parts of antioxidant, 2-5 parts of lubricant, and 15-20 parts of masterbatch.

3. The high temperature resistant and waterproof polyvinyl chloride furniture board according to claim 1, characterized in that: The preparation method of the modified shell powder comprises the following steps: Step (1): adding shell powder, deionized water and oleic acid into a reaction vessel, stirring at room temperature for 2-3 hours, adding ammonia water, heating to 70-75°C for reaction for 4-4.5 hours, centrifuging, washing with 75% ethanol aqueous solution, and freeze-drying to obtain oleic acid-modified shell powder; Step (2): add oleic acid modified shell powder, polyvinyl chloride pyrrolidone, and ethanol aqueous solution into a reaction vessel, ultrasonically disperse for 2-3 hours under a nitrogen atmosphere, degas by vacuuming-nitrogen filling cycle, heat to 70-75°C, add methyl methacrylate and azobisisobutyronitrile, keep warm for reaction, centrifuge, wash, and vacuum freeze-dry to obtain modified shell powder.

4. The high temperature resistant and waterproof polyvinyl chloride furniture board according to claim 3, characterized in that: During the preparation of oleic acid-modified shell powder, the amounts of deionized water, oleic acid, and ammonia water added per 15 g of shell powder are 50-60 mL, 1-1.5 mL, and 4-5 mL, respectively.

5. The high temperature resistant and waterproof polyvinyl chloride furniture board according to claim 3, characterized in that: During the preparation of the modified shell powder, the mass ratio of oleic acid modified shell powder: polyvinyl chloride pyrrolidone: methyl methacrylate is 1:1.5:(3-5); the amount of azobisisobutyronitrile added is 0.5-0.6wt% of the mass of methyl methacrylate.

6. The high temperature resistant and waterproof polyvinyl chloride furniture board according to claim 1, characterized in that: The preparation method of the modified hydrotalcite comprises the following steps: Lanthanum nitrate hexahydrate, magnesium nitrate hexahydrate, and aluminum nitrate nonahydrate are added to deionized water and stirred evenly to obtain solution A; sodium hydroxide and sodium bicarbonate are added to deionized water and stirred evenly to obtain solution B; solution A is added to a reaction vessel, preheated to 70-75°C, and solution B is added dropwise. After the addition is completed, the mixture is kept warm for 8-9 hours, further heated to 170-175°C for 4-5 hours, filtered, and the product is washed with deionized water and vacuum dried at 80-85°C to obtain carbonate hydrotalcite; the carbonate hydrotalcite is added to a methanol solution of oleic acid, heated to 70-72°C for 24 hours, centrifuged, washed, and vacuum dried to obtain modified hydrotalcite.

7. The high temperature resistant and waterproof polyvinyl chloride furniture board according to claim 6, characterized in that: The amounts of the components in solution A, calculated by mass, are 0.445 g of lanthanum nitrate hexahydrate, 8.46 g of magnesium nitrate hexahydrate, and 3.69 g of aluminum nitrate nonahydrate; the amounts of the components in solution B, calculated by mass, are 4 g of sodium hydroxide and 0.475 g of sodium bicarbonate. During the preparation of the modified hydrotalcite, the molar ratio of carbonate hydrotalcite: oleic acid is 1:(6-9).

8. The high temperature resistant and waterproof polyvinyl chloride furniture board according to claim 1, characterized in that: The preparation method of the plasticizer comprises the following steps: ε-caprolactone, dipentaerythritol, and stannous 2-ethylhexanoate were added to a reaction vessel, degassed by vacuum-nitrogen cycle, heated to 120-125° C. under a nitrogen atmosphere for 24 hours, and the product was transferred to an ice bath to terminate the reaction. The product was dissolved in dichloromethane and poured into icy methanol for purification to obtain a plasticizer; During the preparation of the plasticizer, the molar ratio of ε-caprolactone: dipentaerythritol: stannous 2-ethylhexanoate is 100: (1.66-1.74): (0.5-0.52).

9. The high temperature resistant and waterproof polyvinyl chloride furniture board according to claim 1, characterized in that: The preparation method of the auxiliary plasticizer comprises the following steps: Step (1): formic acid and hydrogen peroxide are mixed uniformly at room temperature to obtain a mixture A; linseed oil is added to a reaction vessel, preheated to 60-65°C, and mixture A is added. After the addition is completed, the mixture is kept warm for 4-5 hours, the product is dissolved in ethyl acetate, and washed with deionized water, a 2wt% sodium bicarbonate aqueous solution, and a sodium chloride aqueous solution in sequence until the pH reaches 7.

0. The organic layer is dried with anhydrous magnesium sulfate, rotary evaporated, and vacuum dried at 60-65°C for 12 hours to obtain epoxidized linseed oil; Step (2): adding epoxidized linseed oil, butyric acid, and toluene to a reaction vessel, heating to 100-105°C, and reflux reaction for 4-8 hours under a nitrogen atmosphere, dissolving the product in ethyl acetate, washing with deionized water, 2 wt% sodium bicarbonate aqueous solution, and sodium chloride aqueous solution in sequence until the pH reaches 7.0, drying the organic layer with anhydrous magnesium sulfate, rotary evaporation, and vacuum drying at 60-65°C for 12 hours to obtain butyric acid-modified linseed oil; Step (3): adding butyric acid-modified linseed oil, ε-caprolactone, and stannous octoate into a reaction vessel, heating to 110-115°C, reacting for 10-12 hours under a nitrogen atmosphere, dissolving the product in tetrahydrofuran, pouring into petroleum ether for precipitation, collecting the precipitate, and vacuum drying at 40-45°C for 12 hours to obtain an auxiliary plasticizer; During the preparation of epoxidized linseed oil, the molar ratio of linseed oil:formic acid:hydrogen peroxide is 79.7:159:1000; during the preparation of butyric acid-modified linseed oil, the molar ratio of epoxidized linseed oil:butyric acid is 2.9:68.1; during the preparation of the auxiliary plasticizer, the mass ratio of butyric acid-modified linseed oil:ε-caprolactone is 1:3; and the amount of stannous octoate added is 0.27-3wt% of the mass of ε-caprolactone.

10. A process for preparing a high-temperature resistant and waterproof polyvinyl chloride furniture board according to any one of claims 1 to 9, characterized in that: The following steps are involved: Add polyvinyl chloride resin, modified shell powder, modified hydrotalcite, plasticizer, auxiliary plasticizer, antioxidant, lubricant and masterbatch into a mixer in sequence, melt blend at 150-160°C, keep the mixture at 150°C for 5 minutes as a preheating step, and hot press at 10MPa pressure for 5-6 minutes to obtain polyvinyl chloride furniture board.

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