Anti-deformation SPC composite wallboard and preparation method thereof

Abstract

The invention discloses an anti-deformation SPC composite wallboard and a preparation method thereof, and belongs to the technical field of building materials. The SPC composite wallboard is formed by sequentially attaching melamine balance paper, an SPC base material and melamine decorative paper from bottom to top. The SPC base material comprises the following raw materials in parts by weight: 95-125 parts of polyvinyl chloride resin, 346-430 parts of modified filler, 4-10 parts of a stabilizer, 3-6 parts of a processing aid, 2-5 parts of a lubricant, 1-3 parts of a plasticizer and 0.1-1 part of an initiator. Under the action of the modified coupling agent, the interface compatibility between the prepared modified filler and the polyvinyl chloride resin is good, and the dispersity in the SPC composite wallboard is high, so that the modified filler can fully and stably play a role, and the SPC wallboard has excellent and stable anti-deformation capability, antibacterial property, wear resistance and the like; the flame-retardant and smoke-suppression composite material also has efficient, safe and lasting flame-retardant and smoke-suppression performance, and can stably release negative ions, purify the space environment and improve the human health.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials, and specifically relates to a deformation-proof SPC composite wallboard and a preparation method thereof. Background Art

[0002] SPC is a composite material mainly made of stone powder and PVC resin (polyvinyl chloride). The SPC material combines the hardness of natural stone powder and the flexibility of polyvinyl chloride plastic, and has the characteristics of environmental protection, durability, waterproof and moisture-proof, etc. It has been widely used in the fields of decorative materials such as floors, wallboards, and floor tiles, and has been favored by the market and consumers.

[0003] Although the combination of high-hardness and pressure-resistant stone powder and moisture-proof polyvinyl chloride resin can make the SPC wallboard not easily deformed and cracked, and can remain stable even in a humid environment. However, due to the poor interfacial compatibility between the stone powder and the polyvinyl chloride resin, the stone powder is unevenly dispersed in the SPC wallboard, resulting in uneven density of the SPC wallboard and making it easily deformed and cracked. In addition, since SPC wallboards are usually used in places such as restaurants, hospitals, and shopping malls, where the personnel are dense and the environment is complex, the SPC wallboards have higher requirements for fire and mildew prevention performance. Therefore, it is urgent to design and prepare an SPC composite wallboard with excellent fire and mildew prevention performance and anti-deformation ability to meet the market demand and expand the application scenarios. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art, and provide a deformation-proof SPC composite wallboard and a preparation method thereof.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A deformation-proof SPC composite wallboard is composed of a melamine balance paper, an SPC substrate, and a melamine decorative paper laminated in sequence from bottom to top.

[0007] Further, the SPC substrate includes the following raw materials in parts by weight: 95-125 parts of polyvinyl chloride resin, 346-430 parts of modified filler, 4-10 parts of stabilizer, 3-6 parts of processing aid, 2-5 parts of lubricant, 1-3 parts of plasticizer, and 0.1-1 part of initiator.

[0008] Further, the modified filler is prepared by the following steps:

[0009] Take dry stone powder, kaolin, and tourmaline, disperse them in absolute ethanol, mix well, then add acetic acid while stirring to adjust the pH to 4. After stirring evenly, transfer it to a three-necked flask. Disperse the modified coupling agent in deionized water and DMF (N,N-dimethylformamide), stir evenly and then transfer it to the above three-necked flask. After the transfer is completed, heat up to 65 °C, keep warm and react for 1 h. After the reaction is over, cool it to room temperature, centrifuge, take the precipitate and ultrasonically vibrate it in absolute ethanol for 0.5 h. After the vibration is over, dry it at 80 °C for 12 h to obtain the modified filler.

[0010] Further, the mass ratio of the stone powder, kaolin, and tourmaline is (30 - 35):(1 - 2):(2 - 4).

[0011] Further, the mass ratio of the total mass of the stone powder, kaolin, and tourmaline to the mass of the modified coupling agent is 20:1.

[0012] Further, the modified coupling agent is prepared by the following steps:

[0013] (1) Add tris(2-chloroethyl) phosphate, triethylamine, and ethanol to a well-dried three-necked flask, stir evenly and then add N-methylbutylamine. After the addition is completed, heat up to 60 °C and stir and react for 3 h. After the reaction is over, first cool it to room temperature and then perform vacuum distillation to obtain intermediate 1. The dosage ratio of tris(2-chloroethyl) phosphate, N-methylbutylamine, triethylamine, and ethanol is 41 mL:49 mL:33 mL:200 mL;

[0014] Control the molar ratio of tris(2-chloroethyl) phosphate to N-methylbutylamine to be 1:2.05 - 2.1. The -Cl of tris(2-chloroethyl) phosphate and the -NH- of N-methylbutylamine undergo a nucleophilic substitution reaction. Triethylamine is an acid-binding agent. The reaction process is as follows:

[0015]

[0016] (2) Add 3-mercapto-1-propanol, ethanol, and 20 wt% sodium hydroxide solution to a four-necked flask, stir well until evenly mixed, then slowly add intermediate 1 and potassium iodide. After the addition is completed, stir and heat up to 75 °C, keep warm and react for 2 h, then cool it to room temperature, perform vacuum distillation, and purify by column chromatography (select a mixed solvent of benzene and ether as the eluent, and the volume ratio of benzene to ether is 6:4). Finally, perform vacuum distillation to remove the eluent to obtain intermediate 2. The dosage ratio of 3-mercapto-1-propanol, intermediate 1, and potassium iodide is 13 mL:50.6 g:0.8 g;

[0017] Under the catalysis of potassium iodide, when the molar ratio of 3-mercapto-1-propanol to intermediate 1 is 1.1 - 1.2:1, 3-mercapto-1-propanol and intermediate 1 undergo a nucleophilic substitution reaction. The reaction process is as follows:

[0018]

[0019] (3) The dry three-necked flask was purged with nitrogen for 30 min to remove the air and moisture in the flask, and then intermediate 2, tetra-isopropyl titanate and dimethyl sulfoxide were added. After stirring evenly, 3-mercaptopropyltrimethoxysilane was slowly added. After the addition, the temperature was raised to 90 °C and the reaction was carried out for 26 h. After the reaction was completed, it was cooled to room temperature, and then distilled under reduced pressure and purified by column chromatography (the eluent was a mixed solvent of cyclohexane and ethyl acetate, and the volume ratio of cyclohexane to ethyl acetate was 1:1). Finally, the eluent was removed by distillation under reduced pressure to obtain intermediate 3; the dosage ratio of intermediate 2, 3-mercaptopropyltrimethoxysilane, tetra-isopropyl titanate and dimethyl sulfoxide was 44.3 g: 20 mL: 0.9 mL: 240 mL;

[0020] The molar ratio of intermediate 2 and 3-mercaptopropyltrimethoxysilane was controlled to be 1: 1.05-1.1. The following chemical reaction occurred between the hydroxyl group of intermediate 2 and the silane oxygen group of 3-mercaptopropyltrimethoxysilane under the catalysis of tetra-isopropyl titanate. The reaction process is shown as follows:

[0021]

[0022] (4) The dry three-necked flask was purged with nitrogen for 30 min to remove the air and moisture in the flask, and then intermediate 3, octavinyl-POSS, 2-tert-butylanthraquinone and DMF were added. After stirring, dissolving and mixing evenly, it was irradiated under a 365 nm ultraviolet lamp for 0.5 h under nitrogen protection. After the irradiation was completed, it was distilled under reduced pressure to obtain the modified coupling agent; the dosage ratio of intermediate 3, octavinyl-POSS, 2-tert-butylanthraquinone and DMF was 52 g: 13 g: 0.07 g: 250 mL.

[0023] Under the photoinitiator 2-tert-butylanthraquinone and ultraviolet lamp irradiation, the molar ratio of intermediate 3 and octavinyl-POSS was controlled to be 4.1-4.2: 1. Then, the mercapto group of intermediate 3 could undergo a thiol-ene click reaction with the carbon-carbon double bond of octavinyl-POSS. The structural formula of octavinyl-POSS is shown as follows:

[0024]

[0025] The addition of stone powder makes the SPC composite wallboard harder, which can effectively resist daily wear and scratches, and is especially suitable for use in high-traffic areas such as restaurants, hospitals and shopping malls, etc.; the stone powder and polyvinyl chloride resin combine to form a hard and stable core layer, endowing the SPC composite wallboard with excellent compressive strength and stability, and at the same time endowing it with excellent waterproof performance; in addition, the addition of stone powder increases the density and weight of the SPC composite wallboard, making it not easy to expand, contract or deform under temperature and humidity changes.

[0026] The addition of kaolin can effectively improve the tensile strength, flexural strength and impact strength of SPC composite wallboards, etc., meeting various complex application requirements.

[0027] Tourmaline is the general term for tourmaline group minerals. Its chemical composition is relatively complex. It is a cyclic structure silicate mineral containing aluminum, sodium, iron, magnesium, and lithium characterized by boron. The complex and unique crystal structure of tourmaline endows it with unique properties such as negative ion release, high wear resistance, and far-infrared radiation. It can be compounded with other materials by physical or chemical methods to obtain a variety of functional materials. Tourmaline itself has the ability of permanent spontaneous polarization and does not require an additional electric field to boost, so there is no need to worry about the aging problem of negative ion release. In addition, there is a strong electric field around tourmaline, which has an inhibitory effect on the reproduction of bacteria, and the far-infrared function of tourmaline itself can also play an antibacterial role.

[0028] The modified coupling agent contains rich flame-retardant elements such as phosphorus, nitrogen, silicon, and sulfur elements, and also contains POSS. The phosphorus element provides an acid source, acts on the polymer material, and promotes the formation of carbide; the nitrogen element provides a gas source, which can cause the system to expand and foam, and also promotes the formation of the carbonized layer, forming a porous foam carbon; the silicon element generates an inorganic heat-insulating and insulating protective layer containing -Si-O bonds and -Si-C- bonds during combustion, which not only prevents the decomposition products generated by combustion from escaping, but also inhibits the thermal decomposition of the polymer material; the sulfur element generates SO2, sulfurous acid and water when heated, which can promote the Fries rearrangement of the polymer material, accelerate the carbonization of the polymer material, and further enhance the flame-retardant performance. The skeleton of POSS has a regular cage structure, and the skeleton is a silicon-oxygen skeleton structure, which has a certain rigidity, making POSS have relatively high thermal stability and mechanical properties. And when heated, it will form a more dense and stable protective layer containing Si-O bonds and Si-C- bonds than the conventional carbon layer, isolating the heat transfer and the escape of combustibles generated by the decomposition of the polymer material, and at the same time blocking the supply of oxygen, enhancing the flame-retardant, heat-resistant and mechanical properties of the polymer material. Therefore, the modified coupling agent endows the modified filler with excellent flame-retardant and smoke-suppressing properties. The addition of the modified filler significantly improves the flame-retardant and smoke-suppressing properties of the SPC composite wallboard, and thus effectively expands the application field of the SPC composite wallboard.

[0029] The modified coupling agent contains abundant silane oxy groups, which can generate Si-O-Si and Si-OH after hydrolysis and condensation. The hydroxyl groups of Si-OH can form covalent bonds with the hydroxyl groups on the surfaces of stone powder, kaolin, and tourmaline, thereby preparing modified fillers. At the same time, this chemical bonding effectively improves the dispersion degree of stone powder, kaolin, and tourmaline in the SPC composite wallboard, thus enhancing the anti-deformation ability, antibacterial property, negative ion release ability, and wear resistance of the SPC composite wallboard, etc. Meanwhile, the modified coupling agent is an organic substance. According to the principle of similar compatibility, the interfacial compatibility between the modified coupling agent and polyvinyl chloride resin is good. Therefore, the compatibility of the modified filler in the SPC composite wallboard will also be improved. In addition, the surface of the modified coupling agent also contains terminal carbon-carbon double bonds. Therefore, the surface of the modified filler also contains abundant terminal carbon-carbon double bonds. The terminal carbon-carbon double bonds can chemically react with the unreacted carbon-carbon double bonds at the ends of the polyvinyl chloride resin under the action of an initiator. This will further improve the dispersion degree of the modified filler in the SPC composite wallboard. Furthermore, the SPC wallboard of the present invention not only has excellent and stable anti-deformation ability, antibacterial property, and wear resistance, etc., but also has efficient, safe, and long-lasting flame retardant and smoke suppression properties. At the same time, it can stably release negative ions, purify the space environment, and improve human health.

[0030] Further, the stabilizer is one or more of calcium-zinc stabilizer, organotin stabilizer, and rare earth stabilizer.

[0031] Further, the lubricant is one or more of polyethylene wax, stearic acid, and butyl stearate.

[0032] Further, the processing aid is one or more of processing aid ACR, chlorinated polyethylene, and nitrile rubber.

[0033] Further, the plasticizer is one or more of diisononyl cyclohexane-1,2-dicarboxylate, dioctyl sebacate, and dioctyl phthalate.

[0034] Further, the initiator is one or more of benzoyl peroxide, azobisisobutyronitrile, and diisopropylbenzene peroxide.

[0035] A preparation method of an anti-deformation SPC composite wallboard includes the following steps:

[0036] Weigh the raw materials of the SPC substrate by weight parts and prepare melamine balance paper and melamine decorative paper; put the raw materials of the SPC substrate into a high-speed mixer, mix evenly and then cool down to 45-50 °C, and then send them into an extruder to heat and extrude into a sheet. The formed sheet is calendered and shaped by a calender to obtain the SPC substrate; laminate the melamine balance paper and melamine decorative paper on the front and back of the SPC substrate in sequence, and then the anti-deformation SPC composite wallboard is obtained.

[0037] Advantages of the present invention: Under the action of the modified coupling agent, the prepared modified filler has good interfacial compatibility with the polyvinyl chloride resin and high dispersion in the SPC composite wallboard, so it can play a role fully and stably. The SPC wallboard of the present invention not only has excellent and stable anti-deformation ability, antibacterial property and wear resistance, etc., but also has efficient, safe and long-lasting flame retardant and smoke suppression performance. At the same time, it can stably release negative ions, purify the space environment and improve human health. Specific embodiments

[0038] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0039] Example 1, preparing a modified coupling agent, the specific steps are as follows:

[0040] (1) Add 41 mL of tris(2-chloroethyl) phosphate, 33 mL of triethylamine and 200 mL of ethanol into a fully dried 500 mL three-necked flask, stir evenly, then add 49 mL of N-methylbutylamine. After adding, heat up to 60 °C and stir for 3 h. After the reaction is completed, cool to room temperature first, and then perform vacuum distillation to obtain Intermediate 1;

[0041] (2) Add 13 mL of 3-mercapto-1-propanol, 250 mL of ethanol and 5.5 mL of 20 wt% sodium hydroxide solution into a 500 mL four-necked flask, stir well until evenly mixed, then slowly add 50.6 g of Intermediate 1 and 0.8 g of potassium iodide. After adding, stir and heat up to 75 °C, keep the temperature for 2 h, then cool to room temperature, perform vacuum distillation, and purify by column chromatography (the eluent is a mixed solvent of benzene and ether, and the volume ratio of benzene to ether is 6:4). Finally, perform vacuum distillation to remove the eluent to obtain Intermediate 2;

[0042] (3) Blow nitrogen into a 500 mL dry three-necked flask for 30 min to remove the air and moisture in the flask, then add 44.3 g of Intermediate 2, 0.9 mL of tetra-isopropyl titanate and 240 mL of dimethyl sulfoxide, stir evenly, and then slowly add 20 mL of mercaptopropyltrimethoxysilane. After adding, heat up to 90 °C and react for 26 h. After the reaction is completed, cool to room temperature, perform vacuum distillation, and purify by column chromatography (the eluent is a mixed solvent of cyclohexane and ethyl acetate, and the volume ratio of cyclohexane to ethyl acetate is 1:1). Finally, perform vacuum distillation to remove the eluent to obtain Intermediate 3;

[0043] (4) The 500 mL dry three-necked flask was purged with nitrogen for 30 min to expel the air and moisture inside the flask, then 52 g of Intermediate 3, 13 g of octavinyl-POSS, 0.07 g of 2-tert-butylanthraquinone, and 250 mL of DMF were added. After stirring to dissolve and mix evenly, it was placed under a 365 nm ultraviolet lamp for irradiation for 0.5 h under nitrogen protection. After the irradiation ended, it was distilled under reduced pressure to obtain the modified coupling agent.

[0044] Example 2. Preparation of the modified filler. The specific steps are as follows:

[0045] Take 30 g of dry stone powder, 1 g of kaolin, and 2 g of tourmaline and disperse them in 200 mL of absolute ethanol. After fully mixing evenly, acetic acid was added dropwise while stirring to adjust the pH = 4. After stirring evenly, it was transferred to a 500 mL three-necked flask; 1.65 g of the modified coupling agent was dispersed in 10 mL of deionized water and 10 mL of DMF, and after stirring evenly, it was transferred to the above three-necked flask. After the transfer was completed, the temperature was raised to 65 °C and kept warm for reaction for 1 h. After the reaction ended, it was cooled to room temperature, centrifuged, and the precipitate was taken and ultrasonically vibrated in absolute ethanol for 0.5 h. After the vibration ended, it was dried at 80 °C for 12 h to obtain the modified filler.

[0046] Example 3. Preparation of the modified filler. The specific steps are as follows:

[0047] Take 32 g of dry stone powder, 1.5 g of kaolin, and 3 g of tourmaline and disperse them in 200 mL of absolute ethanol. After fully mixing evenly, acetic acid was added dropwise while stirring to adjust the pH = 4. After stirring evenly, it was transferred to a 500 mL three-necked flask; 1.775 g of the modified coupling agent was dispersed in 10 mL of deionized water and 10 mL of DMF, and after stirring evenly, it was transferred to the above three-necked flask. After the transfer was completed, the temperature was raised to 65 °C and kept warm for reaction for 1 h. After the reaction ended, it was cooled to room temperature, centrifuged, and the precipitate was taken and ultrasonically vibrated in absolute ethanol for 0.5 h. After the vibration ended, it was dried at 80 °C for 12 h to obtain the modified filler.

[0048] Example 4. Preparation of the modified filler. The specific steps are as follows:

[0049] Take 35 g of dry stone powder, 2 g of kaolin, and 4 g of tourmaline and disperse them in 200 mL of absolute ethanol. After fully mixing evenly, acetic acid was added dropwise while stirring to adjust the pH = 4. After stirring evenly, it was transferred to a 500 mL three-necked flask; 2.05 g of the modified coupling agent was dispersed in 10 mL of deionized water and 10 mL of DMF, and after stirring evenly, it was transferred to the above three-necked flask. After the transfer was completed, the temperature was raised to 65 °C and kept warm for reaction for 1 h. After the reaction ended, it was cooled to room temperature, centrifuged, and the precipitate was taken and ultrasonically vibrated in absolute ethanol for 0.5 h. After the vibration ended, it was dried at 80 °C for 12 h to obtain the modified filler.

[0050] Example 5. Preparation of the SPC composite wallboard. The specific steps are as follows:

[0051] Weigh 95 parts of polyvinyl chloride resin, 346 parts of the modified filler prepared in Example 2, 4 parts of XT-3 rare earth stabilizer, 3 parts of processing aid ACR-201, 2 parts of polyethylene wax, 1 part of dioctyl phthalate, and 0.1 part of diisopropylbenzene peroxide, and prepare melamine balance paper and melamine decorative paper; put the raw materials of the SPC substrate into a high-speed mixer, mix evenly and then cool down to 45°C, and then send them into an extruder to heat and extrude into a sheet. After the formed sheet is calendered and shaped by a calender, the SPC substrate is obtained; the melamine balance paper and melamine decorative paper are successively laminated on the front and back sides of the SPC substrate to obtain the SPC composite wallboard.

[0052] Example 6. The preparation of the SPC composite wallboard is carried out as follows:

[0053] Weigh 120 parts of polyvinyl chloride resin, 420 parts of the modified filler prepared in Example 3, 8 parts of dioctyltin dilaurate, 5 parts of chlorinated polyethylene, 2 parts of polyethylene wax, 2 parts of stearic acid, 1 part of diisononyl cyclohexane-1,2-dicarboxylate, 1 part of dioctyl sebacate, and 0.5 part of azobisisobutyronitrile, and prepare melamine balance paper and melamine decorative paper; put the raw materials of the SPC substrate into a high-speed mixer, mix evenly and then cool down to 48°C, and then send them into an extruder to heat and extrude into a sheet. After the formed sheet is calendered and shaped by a calender, the SPC substrate is obtained; the melamine balance paper and melamine decorative paper are successively laminated on the front and back sides of the SPC substrate to obtain the SPC composite wallboard.

[0054] Example 7. The preparation of the SPC composite wallboard is carried out as follows:

[0055] Weigh 125 parts of polyvinyl chloride resin, 430 parts of the modified filler prepared in Example 4, 8 parts of calcium-zinc stabilizer, 2 parts of dioctyltin dilaurate, XT-3 rare earth stabilizer, 2 parts of processing aid ACR-201, 2 parts of chlorinated polyethylene, 2 parts of nitrile rubber, 2 parts of polyethylene wax, 3 parts of butyl stearate, 2 parts of diisononyl cyclohexane-1,2-dicarboxylate, 0.5 part of dioctyl sebacate, 0.5 part of dioctyl phthalate, and 1 part of benzoyl peroxide, and prepare melamine balance paper and melamine decorative paper; put the raw materials of the SPC substrate into a high-speed mixer, mix evenly and then cool down to 50°C, and then send them into an extruder to heat and extrude into a sheet. After the formed sheet is calendered and shaped by a calender, the SPC substrate is obtained; the melamine balance paper and melamine decorative paper are successively laminated on the front and back sides of the SPC substrate to obtain the SPC composite wallboard.

[0056] Comparative Example 1. The preparation of the modified filler is carried out as follows:

[0057] Keep the remaining steps unchanged, and only replace the modified coupling agent in Example 2 with 3-aminopropyltrimethoxysilane, thereby preparing a modified filler.

[0058] Comparative Example 2. To prepare an SPC composite wallboard, the specific steps are as follows:

[0059] Keep the remaining steps unchanged, and only replace the modified filler in Example 5 with the modified filler prepared in Comparative Example 1, thereby preparing an SPC composite wallboard.

[0060] Comparative Example 3. To prepare an SPC composite wallboard, the specific steps are as follows:

[0061] Keep the remaining steps unchanged, and only replace the modified filler in Example 5 with 300 parts of stone powder without any treatment, 10 parts of kaolin, 20 parts of tourmaline, and 16 parts of flame retardant FRC-6, thereby preparing an SPC composite wallboard.

[0062] Performance Test

[0063] Test the combustion grade of the SPC composite wallboards prepared in Examples 5-7 and Comparative Examples 2-3 according to the standard of UL94-2018; then place the SPC composite wallboards prepared in Examples 5-7 and Comparative Examples 2-3 in an oven with a set temperature of 80 °C for 6 hours, and then test the dimensional change rate, warpage amount, and negative ion release amount of the SPC composite wallboards according to the standards of GB / T4085-2015 and GB / T34440-2017 (the specimen size is 240 mm 2 , standard requirement: the dimensional change rate after heating ≤ 0.25%, the warpage amount after heating ≤ 2 mm). The test results of all items are shown in the following table:

[0064]

[0065] In the description of the specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0066] The above content is only an example and illustration of the present invention. Those skilled in the art of the present technology make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the invention or exceed the scope defined by the claims of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An anti-deformation SPC composite wallboard, which is sequentially laminated from bottom to top by a melamine balance paper, an SPC substrate and a melamine decorative paper, and is characterized in that, The SPC substrate comprises the following raw materials in parts by weight: 95-125 parts of polyvinyl chloride resin, 346-430 parts of modified filler, 4-10 parts of stabilizer, 3-6 parts of processing aid, 2-5 parts of lubricant, 1-3 parts of plasticizer, and 0.1-1 part of initiator; Among them, the modified filler is prepared by the following steps: Take stone powder, kaolin, and tourmaline, disperse them in absolute ethanol, mix evenly, add acetic acid to adjust the pH to 4, stir, and transfer to a flask; Disperse the modified coupling agent in deionized water and DMF, stir, and transfer to the above flask, heat to 65 °C and react for 1 h, cool, centrifuge, take the precipitate, ultrasonically vibrate in absolute ethanol, and dry to obtain the modified filler; The modified coupling agent is prepared by the following steps: (1) Add tris(2-chloroethyl) phosphate, triethylamine, and ethanol to a flask, stir, add N-methylbutylamine, heat to 60 °C after adding, stir and react for 3 h, cool to room temperature first after the reaction, and then perform vacuum distillation to obtain intermediate 1; (2) Add 3-mercapto-1-propanol, ethanol, and 20 wt% sodium hydroxide solution to a flask, stir, add intermediate 1 and potassium iodide, heat to 75 °C and react for 2 h, cool to room temperature, perform vacuum distillation, purify by column chromatography, and perform vacuum distillation to obtain intermediate 2; (3) Bubble nitrogen into the flask, add intermediate 2, tetra-isopropyl titanate, and dimethyl sulfoxide, stir, add 3-mercaptopropyltrimethoxysilane, heat to 90 °C and react for 26 h, cool to room temperature after the reaction, perform vacuum distillation, purify by column chromatography, and perform vacuum distillation to obtain intermediate 3; (4) Bubble nitrogen into the flask, add intermediate 3, octavinyl-POSS, 2-tert-butylanthraquinone, and DMF, stir, irradiate under a 365 nm ultraviolet lamp for 0.5 h under nitrogen protection, and perform vacuum distillation to obtain the modified coupling agent.

2. The anti-deformation SPC composite wallboard according to claim 1, characterized in that, The mass ratio of the stone powder, kaolin, and tourmaline is (30-35):(1-2):(2-4).

3. The anti-deformation SPC composite wallboard according to claim 1, wherein, The mass ratio of the total mass of the stone powder, kaolin, and tourmaline to the mass of the modified coupling agent is 20:

1.

4. The anti-deformation SPC composite wallboard according to claim 1, wherein, The dosage ratios of tris(2-chloroethyl) phosphate, N-methylbutylamine, triethylamine, and ethanol in step (1) are 41 mL:49 mL:33 mL:200 mL; the dosage ratios of 3-mercapto-1-propanol, intermediate 1, and potassium iodide in step (2) are 13 mL:50.6 g:0.8 g; the dosage ratios of intermediate 2, 3-mercaptopropyltrimethoxysilane, tetra-isopropyl titanate, and dimethyl sulfoxide in step (3) are 44.3 g:20 mL:0.9 mL:240 mL; the dosage ratios of intermediate 3, octavinyl-POSS, 2-tert-butylanthraquinone, and DMF in step (4) are 52 g:13 g:0.07 g:250 mL.

5. The anti-deformation SPC composite wallboard according to claim 1, wherein, The stabilizer is one or more of calcium-zinc stabilizer, organotin stabilizer, and rare earth stabilizer.

6. The anti-deformation SPC composite wallboard according to claim 1, characterized in that, The lubricant is one or more of polyethylene wax, stearic acid, and butyl stearate.

7. The anti-deformation SPC composite wallboard according to claim 1, characterized in that, The processing aid is one or more of processing aid ACR, chlorinated polyethylene, and nitrile rubber.

8. The anti-deformation SPC composite wallboard according to claim 1, wherein The plasticizer is one or more of diisononyl cyclohexane-1,2-dicarboxylate, dioctyl sebacate, and dioctyl phthalate.

9. The anti-deformation SPC composite wallboard according to claim 1, characterized in that, The initiator is one or more of benzoyl peroxide, azobisisobutyronitrile, and diisopropylbenzene peroxide.

10. The preparation method of a deformation-proof SPC composite wallboard according to claim 1, characterized in that, It includes the following steps: Weigh the raw materials of the SPC substrate by weight, and prepare melamine balance paper and melamine decorative paper; put the raw materials of the SPC substrate into a high-speed mixer, cool it to 45-50 °C after mixing evenly, and then send it into an extruder to heat and extrude into a sheet. The formed sheet is calendered and shaped by a calender to obtain the SPC substrate; the melamine balance paper and melamine decorative paper are successively laminated on the front and back sides of the SPC substrate to obtain the anti-deformation SPC composite wallboard.

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