Anti-deformation SPC composite wallboard and preparation method thereof

Abstract

The application discloses a kind of anti-deformation SPC composite wallboard and preparation method thereof, belong to building material technical field.SPC composite wallboard is by melamine balance paper, SPC base material and melamine decorative paper from bottom to top sequentially bonded and formed.SPC base material raw material: polyvinyl chloride resin 95-125 parts, modified filler 346-430 parts, stabilizer 4-10 parts, processing aid 3-6 parts, lubricant 2-5 parts, plasticizer 1-3 parts, initiator 0.1-1 part.Under the action of modified coupling agent, the interface compatibility between the modified filler prepared and polyvinyl chloride resin is good, and the dispersity is high in SPC composite wallboard, so it can fully and stably play a role, so that the SPC wallboard of the application not only has excellent and stable anti-deformation ability, antibacterial property and wear resistance, etc., but also has efficient, safe and durable flame-retardant and smoke-suppressing performance, and can also stably release negative ions, purify space environment, and improve human health.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to a deformation-resistant SPC composite wallboard and a preparation method thereof. BACKGROUND

[0002] SPC is a composite material made of stone powder and PVC resin (polyvinyl chloride) as main raw materials. SPC material combines the hardness of natural stone powder and the flexibility of polyvinyl chloride plastic, has the characteristics of environmental protection, durability, waterproofness and moisture resistance, and has a wide application in the field of decorative materials such as floor, wallboard and floor tile, and is favored by the market and consumers.

[0003] Although the stone powder with high hardness and pressure resistance and the polyvinyl chloride resin not easy to be damp together can make the SPC wallboard not easy to deform and crack, 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 not uniformly dispersed in the SPC wallboard, which leads to uneven density of the SPC wallboard, making it easy to deform and crack. In addition, since the SPC wallboard is usually used in places such as restaurants, hospitals and shopping malls, the personnel are dense and the environment is complex, so the SPC wallboard should have higher requirements for fireproof and mildewproof performance. Therefore, it is urgent to design and prepare a SPC composite wallboard with excellent fireproof and mildewproof performance and deformation resistance to meet the market demand and expand the application scenarios. SUMMARY

[0004] The application aims to overcome the defects of the prior art and provide a deformation-resistant SPC composite wallboard and a preparation method thereof.

[0005] The object of the application can be achieved by the following technical solutions.

[0006] A deformation-resistant SPC composite wallboard is formed by sequentially adhering melamine balancing paper, SPC substrate and melamine decorative paper from bottom to top.

[0007] Further, the SPC substrate comprises the following raw materials 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] The dry stone powder, kaolin and tourmaline are dispersed in anhydrous ethanol, mixed uniformly, acetic acid is added to adjust pH = 4 while stirring, then stirred uniformly and transferred into a three-necked flask; the modified coupling agent is dispersed in deionized water and DMF (N,N-dimethylformamide), stirred uniformly and transferred into the three-necked flask, then heated to 65℃, and kept for 1h after reaction, cooled to room temperature, centrifuged, and the precipitate is ultrasonically oscillated in anhydrous ethanol for 0.5h, then dried at 80℃ for 12h 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 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) tris (2-chloroethyl) phosphate, triethylamine and ethanol are added to a fully dried three-necked flask, stirred uniformly, then N-methylbutylamine is added, heated to 60℃ after addition, stirred for 3h after reaction, cooled to room temperature first, then distilled under reduced pressure to obtain intermediate 1; the amount ratio of tris (2-chloroethyl) phosphate, N-methylbutylamine, triethylamine and ethanol is 41mL:49mL:33mL:200mL;

[0014] The molar ratio of tris (2-chloroethyl) phosphate and N-methylbutylamine is controlled to be 1:2.05-2.1, nucleophilic substitution reaction occurs between -Cl of tris (2-chloroethyl) phosphate and -NH- of N-methylbutylamine, and triethylamine is an acid binding agent, the reaction process is as follows:

[0015]

[0016] (2) 3-mercapto-1-propanol, ethanol and 20wt% sodium hydroxide solution are added to a four-necked flask, stirred to mix uniformly, then intermediate 1 and potassium iodide are slowly added, stirred and heated to 75℃ after addition, kept for 2h after reaction, cooled to room temperature, distilled under reduced pressure, purified by column chromatography (the eluent is a mixed solvent of benzene and diethyl ether, the volume ratio of benzene and diethyl ether is 6:4), and finally distilled under reduced pressure to remove the eluent to obtain intermediate 2; the amount ratio of 3-mercapto-1-propanol, intermediate 1 and potassium iodide is 13mL:50.6g:0.8g;

[0017] Under the catalysis of potassium iodide, the molar ratio of 3-mercapto-1-propanol and intermediate 1 is 1.1-1.2:1, nucleophilic substitution reaction occurs between 3-mercapto-1-propanol and intermediate 1, and the reaction process is as follows:

[0018]

[0019] (3) The dry three-necked flask was blown with nitrogen for 30 min to remove the air and moisture in the bottle, then intermediate 2, titanium isopropylate and dimethyl sulfoxide were added, after stirring, mercaptopropyl trimethoxysilane was slowly added, after the addition was completed, the temperature was raised to 90°C and reacted for 26 h, after the reaction was completed, the temperature was cooled to room temperature, reduced pressure distillation, column chromatography purification (eluent selected cyclohexane and ethyl acetate mixed solvent, the volume ratio of cyclohexane and ethyl acetate was 1:1), finally the eluent was removed by reduced pressure distillation to obtain intermediate 3; the amount ratio of intermediate 2, mercaptopropyl trimethoxysilane, titanium isopropylate and dimethyl sulfoxide was 44.3 g:20 mL:0.9 mL:240 mL;

[0020] The molar ratio of intermediate 2 and mercaptopropyl trimethoxysilane was controlled to be 1:1.05-1.1, and the hydroxyl group of intermediate 2 and the silanyloxy group of mercaptopropyl trimethoxysilane reacted under the catalysis of titanium isopropylate to generate the following chemical reaction, and the reaction process was as follows:

[0021]

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

[0023] Under the action of the photoinitiator 2-tert-butyl anthraquinone and the 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 react with the carbon-carbon double bond of octavinyl-POSS to generate a mercapto-alkene click reaction, and the structural formula of octavinyl-POSS was as follows:

[0024]

[0025] The addition of stone powder makes the SPC composite wallboard more hard, which can effectively resist daily wear and tear, and is especially suitable for high-traffic areas such as restaurants, hospitals and shopping malls; the stone powder and the polyvinyl chloride resin form a hard and stable core layer, which gives the SPC composite wallboard excellent compression resistance and stability, and also gives it excellent waterproof performance; in addition, the addition of stone powder increases the density and weight of the SPC composite wallboard, so that it is not easy to expand, shrink or deform under changes in temperature and humidity.

[0026] The addition of kaolin can effectively improve the tensile strength, bending strength and impact strength of the SPC composite wallboard, and meet various complex application requirements.

[0027] Tourmaline is a general term for tourmaline group minerals, and its chemical composition is complex. It is a cyclic structure silicate mineral containing aluminum, sodium, iron, magnesium, and lithium with boron as a characteristic. The complex and unique crystal structure of tourmaline gives it unique properties such as releasing negative ions, high wear resistance, and far infrared radiation. Tourmaline can be compounded with other materials through physical or chemical methods to produce a variety of functional materials. Tourmaline itself has a permanent spontaneous polarization ability and does not require an additional electric field to maintain, so there is no need to worry about the time limit of negative ion release. In addition, there is a strong electric field around tourmaline, which can inhibit 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, as well as POSS. The phosphorus element provides an acid source that interacts with the polymer material to promote the formation of char; the nitrogen element provides a gas source that can make the system expand and foam, promoting the formation of a porous foam carbon layer; the silicon element generates an inorganic heat-insulating and insulating protective layer containing -Si-O and -Si-C bonds when burned, which not only prevents the decomposition of the combustion-generated substances 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 POSS skeleton has a regular cage structure, with a silicon-oxygen skeleton structure that has a certain rigidity, making POSS have relatively high thermal stability and mechanical properties. When heated, it forms a more dense and stable protective layer containing Si-O and Si-C bonds than conventional carbon layers, which insulates heat transfer and the escape of flammable substances generated by the decomposition of the polymer material, while also blocking the supply of oxygen, enhancing the flame-retardant, heat-resistant, and mechanical properties of the polymer material. Thus, the modified coupling agent endows the modified filler with excellent flame-retardant and smoke-suppressing properties, and the addition of the modified filler significantly improves the flame-retardant and smoke-suppressing properties of the SPC composite wallboard, thereby effectively expanding the application field of the SPC composite wallboard.

[0029] The modified coupling agent contains abundant silanol groups, which can produce Si-O-Si and Si-OH after hydrolysis and condensation, and the hydroxyl groups of Si-OH can form covalent bonds with the hydroxyl groups on the surface of stone powder, kaolin and tourmaline, so that the modified filler is prepared, and meanwhile, the dispersion of the stone powder, kaolin and tourmaline in the SPC composite wallboard is effectively improved, so that the deformation resistance, antibacterial property, anion releasing capacity and wear resistance of the SPC composite wallboard are improved. Meanwhile, the modified coupling agent is an organic substance, and according to the principle of similarity solubility, the interface compatibility between the modified coupling agent and the polyvinyl chloride resin is good, so that the compatibility of the modified filler in the SPC composite wallboard is also improved. In addition, the surface of the modified coupling agent also contains terminal carbon-carbon double bonds, so that the surface of the modified filler also contains abundant terminal carbon-carbon double bonds, which can react with the terminal unreacted carbon-carbon double bonds of the polyvinyl chloride resin under the action of an initiator, so that the dispersion of the modified filler in the SPC composite wallboard is further improved, and thus the SPC wallboard not only has excellent and stable deformation resistance, antibacterial property and wear resistance, but also has efficient, safe and long-lasting flame-retardant and smoke-suppressing properties, and can stably release anions to purify the space environment and improve human health.

[0030] Further, the stabilizer is one or more of calcium-zinc stabilizer, organic tin 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 butyl nitrile rubber.

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

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

[0035] A preparation method of a deformation-resistant SPC composite wallboard, comprising the following steps:

[0036] The raw materials of the SPC substrate are weighed by weight parts, and melamine balance paper and melamine decorative paper are prepared; the raw materials of the SPC substrate are put into a high-speed mixer, uniformly mixed and then cooled to 45-50 DEG C, and then sent into an extruder for heating and extrusion to form a sheet, and the sheet is calendered and shaped by a calender to obtain the SPC substrate; the melamine balance paper and the melamine decorative paper are sequentially attached to the front and back surfaces of the SPC substrate, and the deformation-resistant SPC composite wallboard is obtained.

[0037] The application has the beneficial effects that: under the action of the modified coupling agent, the modified filler prepared has good interface compatibility with the polyvinyl chloride resin, has high dispersity in the SPC composite wallboard, and can fully and stably play a role, so that the SPC wallboard has not only excellent and stable anti-deformation ability, antibacterial property and wear resistance, but also efficient, safe and long-lasting flame-retardant and smoke-suppression performance, and can stably release negative ions to purify the space environment and improve human health. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the application will be clearly and completely described below in combination with the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0039] Embodiment 1, the modified coupling agent is prepared, and the specific steps are as follows:

[0040] (1) 41 mL of tris(2-chloroethyl) phosphate, 33 mL of triethylamine and 200 mL of ethanol are added into a 500 mL three-neck flask which is fully dried, and 49 mL of N-methylbutylamine is added after being uniformly stirred, then the temperature is increased to 60 DEG C after the addition is completed, and the reaction is stirred for 3 h, then the reaction is cooled to room temperature first, and then distilled under reduced pressure to obtain an intermediate 1;

[0041] (2) 13 mL of 3-mercapto-1-propanol, 250 mL of ethanol and 5.5 mL of 20wt% sodium hydroxide solution are added into a 500 mL four-neck flask, and then stirred until mixed uniformly, then 50.6 g of the intermediate 1 and 0.8 g of potassium iodide are slowly added, then the temperature is increased to 75 DEG C after the addition is completed, and the reaction is kept for 2 h, then the reaction is cooled to room temperature, and then distilled under reduced pressure, and then column chromatography is used for purification (the eluent is a mixed solvent of benzene and diethyl ether, and the volume ratio of benzene to diethyl ether is 6:4), and finally the eluent is removed by distillation under reduced pressure to obtain an intermediate 2;

[0042] (3) the 500 mL dried three-neck flask is blown with nitrogen for 30 min to remove the air and moisture in the flask, then 44.3 g of the intermediate 2, 0.9 mL of titanium isopropylate and 240 mL of dimethyl sulfoxide are added, then 20 mL of mercaptopropyltrimethoxysilane is slowly added after being uniformly stirred, then the temperature is increased to 90 DEG C after the addition is completed, and the reaction is kept for 26 h, then the reaction is cooled to room temperature, and then distilled under reduced pressure, and then column chromatography is used for purification (the eluent is a mixed solvent of cyclohexane and ethyl acetate, and the volume ratio of cyclohexane to ethyl acetate is 1:1), and finally the eluent is removed by distillation under reduced pressure to obtain an intermediate 3;

[0043] (4) 500 mL dry three-necked flask was blown with nitrogen for 30 min to remove the air and moisture in the flask, then 52 g of intermediate 3, 13 g of octa- ethylene-POSS, 0.07 g of 2-tert-butyl anthraquinone and 250 mL of DMF were added, stirred, dissolved and mixed uniformly, then irradiated under a 365 nm ultraviolet lamp for 0.5 h under nitrogen protection, and distilled under reduced pressure after the irradiation was completed to obtain a modified coupling agent.

[0044] Example 2, preparation of modified filler, the specific steps are as follows:

[0045] Take dry 30 g of stone powder, 1 g of kaolin, 2 g of tourmaline and disperse them in 200 mL of anhydrous ethanol, mix thoroughly, then add acetic acid to adjust pH = 4 while stirring, mix uniformly, then transfer into a 500 mL three-necked flask; disperse 1.65 g of modified coupling agent in 10 mL of deionized water and 10 mL of DMF, stir uniformly, then transfer into the three-necked flask, then heat to 65 ℃ after the transfer is completed, keep the temperature for 1 h, cool to room temperature after the reaction is completed, centrifuge, take the precipitate, ultrasonic oscillation in anhydrous ethanol for 0.5 h, dry at 80 ℃ for 12 h after the oscillation is completed to obtain a modified filler.

[0046] Example 3, preparation of modified filler, the specific steps are as follows:

[0047] Take dry 32 g of stone powder, 1.5 g of kaolin, 3 g of tourmaline and disperse them in 200 mL of anhydrous ethanol, mix thoroughly, then add acetic acid to adjust pH = 4 while stirring, mix uniformly, then transfer into a 500 mL three-necked flask; disperse 1.775 g of modified coupling agent in 10 mL of deionized water and 10 mL of DMF, stir uniformly, then transfer into the three-necked flask, then heat to 65 ℃ after the transfer is completed, keep the temperature for 1 h, cool to room temperature after the reaction is completed, centrifuge, take the precipitate, ultrasonic oscillation in anhydrous ethanol for 0.5 h, dry at 80 ℃ for 12 h after the oscillation is completed to obtain a modified filler.

[0048] Example 4, preparation of modified filler, the specific steps are as follows:

[0049] Take dry 35 g of stone powder, 2 g of kaolin, 4 g of tourmaline and disperse them in 200 mL of anhydrous ethanol, mix thoroughly, then add acetic acid to adjust pH = 4 while stirring, mix uniformly, then transfer into a 500 mL three-necked flask; disperse 2.05 g of modified coupling agent in 10 mL of deionized water and 10 mL of DMF, stir uniformly, then transfer into the three-necked flask, then heat to 65 ℃ after the transfer is completed, keep the temperature for 1 h, cool to room temperature after the reaction is completed, centrifuge, take the precipitate, ultrasonic oscillation in anhydrous ethanol for 0.5 h, dry at 80 ℃ for 12 h after the oscillation is completed to obtain a modified filler.

[0050] Example 5, preparation of SPC composite wallboard, the specific steps are as follows:

[0051] 95 parts by weight of polyvinyl chloride resin, 346 parts by weight of the modified filler prepared in Example 2, 4 parts by weight of XT-3 type rare earth stabilizer, 3 parts by weight of processing aid ACR-201, 2 parts by weight of polyethylene wax, 1 part by weight of dioctyl phthalate, and 0.1 part by weight of dicumyl peroxide were weighed, and melamine balance paper and melamine decorative paper were prepared; the raw materials of the SPC substrate were put into a high-speed mixer, uniformly mixed, and then cooled to 45°C, and then sent into an extruder to heat and extrude into a sheet, and the sheet was calendered and shaped into an SPC substrate; the melamine balance paper and the melamine decorative paper were sequentially attached to the front and back of the SPC substrate, and the SPC composite wallboard was obtained.

[0052] Example 6, preparation of SPC composite wallboard, the specific steps are as follows:

[0053] 120 parts by weight of polyvinyl chloride resin, 420 parts by weight of the modified filler prepared in Example 3, 8 parts by weight of di-n-octyltin dilaurate, 5 parts by weight of chlorinated polyethylene, 2 parts by weight of polyethylene wax, 2 parts by weight of stearic acid, 1 part by weight of diisononyl cyclohexane 1,2-dicarboxylate, 1 part by weight of dioctyl sebacate, and 0.5 part by weight of azobisisobutyronitrile were weighed, and melamine balance paper and melamine decorative paper were prepared; the raw materials of the SPC substrate were put into a high-speed mixer, uniformly mixed, and then cooled to 48°C, and then sent into an extruder to heat and extrude into a sheet, and the sheet was calendered and shaped into an SPC substrate; the melamine balance paper and the melamine decorative paper were sequentially attached to the front and back of the SPC substrate, and the SPC composite wallboard was obtained.

[0054] Example 7, preparation of SPC composite wallboard, the specific steps are as follows:

[0055] 125 parts by weight of polyvinyl chloride resin, 430 parts by weight of the modified filler prepared in Example 4, 8 parts by weight of calcium-zinc stabilizer, 2 parts by weight of di-n-octyltin dilaurate, XT-3 type rare earth stabilizer, 2 parts by weight of processing aid ACR-201, 2 parts by weight of chlorinated polyethylene, 2 parts by weight of butyl nitrile rubber, 2 parts by weight of polyethylene wax, 3 parts by weight of butyl stearate, 2 parts by weight of diisononyl cyclohexane 1,2-dicarboxylate, 0.5 parts by weight of dioctyl sebacate, 0.5 parts by weight of dioctyl phthalate, and 1 part by weight of dibenzoyl peroxide were weighed, and melamine balance paper and melamine decorative paper were prepared; the raw materials of the SPC substrate were put into a high-speed mixer, uniformly mixed, and then cooled to 50°C, and then sent into an extruder to heat and extrude into a sheet, and the sheet was calendered and shaped into an SPC substrate; the melamine balance paper and the melamine decorative paper were sequentially attached to the front and back of the SPC substrate, and the SPC composite wallboard was obtained.

[0056] Comparative Example 1, preparation of modified filler, the specific steps are as follows:

[0057] The remaining steps are unchanged, only the modified coupling agent of Example 2 is replaced with 3-aminopropyltrimethoxysilane, thereby preparing the modified filler.

[0058] Comparative Example 2, SPC composite wallboard is prepared, the specific steps are as follows:

[0059] The remaining steps are unchanged, only the modified filler of Example 5 is replaced with the modified filler prepared in Comparative Example 1, thereby preparing the SPC composite wallboard.

[0060] Comparative Example 3, SPC composite wallboard is prepared, the specific steps are as follows:

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

[0062] Performance test

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

[0064]

[0065] In the description of the specification, the description of the reference terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] The above is only an example and description of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or adopt similar ways of substitution, as long as they do not deviate from the invention or exceed the scope defined by the present claims, which shall belong to the protection scope of the present application.

Claims

1. A deformation-resistant SPC composite wallboard, which is sequentially attached from bottom to top by melamine balanced paper, SPC substrate and melamine decorative paper, characterized in that, The SPC substrate comprises the following raw materials 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. The modified filler is prepared by the following steps: The stone powder, kaolin and tourmaline are dispersed in anhydrous ethanol, mixed uniformly, acetic acid is added to adjust pH to 4, stirred and then transferred into a flask; the modified coupling agent is dispersed in deionized water and DMF, stirred and then transferred into the flask, heated to 65℃ for 1h, cooled, centrifuged, the precipitate is ultrasonically oscillated in anhydrous ethanol, dried to obtain the modified filler; The modified coupling agent is prepared by the following steps: (1) tris(2-chloroethyl) phosphate, triethylamine and ethanol are added into a flask, stirred, then N-methylbutylamine is added, heated to 60℃ after the addition is completed, stirred for 3h, cooled to room temperature after the reaction is completed, then distilled under reduced pressure to obtain intermediate 1; (2) 3-mercapto-1-propanol, ethanol and 20wt% sodium hydroxide solution are added into a flask, stirred, then intermediate 1 and potassium iodide are added, heated to 75℃ for 2h, cooled to room temperature, distilled under reduced pressure, purified by column chromatography, distilled under reduced pressure to obtain intermediate 2; (3) the flask is blown with nitrogen, then intermediate 2, titanium isopropylate and dimethyl sulfoxide are added, stirred, then mercaptopropyl trimethoxysilane is added, heated to 90℃ for 26h, cooled to room temperature after the reaction is completed, distilled under reduced pressure, purified by column chromatography, distilled under reduced pressure to obtain intermediate 3; (4) the flask is blown with nitrogen, then intermediate 3, octavinyl-POSS, 2-tert-butyl anthraquinone and DMF are added, stirred, then placed under a 365nm ultraviolet lamp for 0.5h under nitrogen protection, distilled under reduced pressure to obtain the modified coupling agent.

2. The deformation-resistant 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 deformation-resistant SPC composite wallboard according to claim 1, characterized in that, The 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 deformation-resistant SPC composite wallboard according to claim 1, characterized in that, The amount ratio of tris(2-chloroethyl) phosphate, N-methylbutylamine, triethylamine and ethanol in step (1) is 41mL:49mL:33mL:200mL; the amount ratio of 3-mercapto-1-propanol, intermediate 1 and potassium iodide in step (2) is 13mL:50.6g:0.8g; the amount ratio of intermediate 2, mercaptopropyl trimethoxysilane, titanium isopropylate and dimethyl sulfoxide in step (3) is 44.3g:20mL:0.9mL:240mL; the amount ratio of intermediate 3, octavinyl-POSS, 2-tert-butyl anthraquinone and DMF in step (4) is 52g:13g:0.07g:250mL.

5. The deformation-resistant SPC composite wallboard according to claim 1, characterized in that, The stabilizer is one or more of calcium-zinc stabilizer, organic tin stabilizer and rare earth stabilizer.

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

8. The deformation-resistant SPC composite wallboard according to claim 1, characterized in that, The plasticizer is one or more of cyclohexane 1,2-dicarboxylic acid diisononyl ester, dioctyl adipate, dioctyl phthalate.

9. The deformation-resistant SPC composite wallboard according to claim 1, characterized in that, The initiator is one or more of dibenzoyl peroxide, azobisisobutyronitrile, dicumyl peroxide.

10. The method for preparing a deformation-resistant SPC composite wall panel according to claim 1, characterized in that, The method comprises the following steps: The raw materials of the SPC substrate are weighed by weight parts, and the melamine balance paper and the melamine decorative paper are prepared; the raw materials of the SPC substrate are put into a high-speed mixer, uniformly mixed, and then cooled to 45-50 DEG C, and then sent into an extruder to heat and extrude into a sheet, and the sheet is calendered and shaped by a calender to obtain the SPC substrate; the melamine balance paper and the melamine decorative paper are sequentially attached to the front and back surfaces of the SPC substrate, and the anti-deformation SPC composite wallboard is obtained.

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