A wear-resistant SPC composite wallboard and preparation method thereof

Abstract

The present invention relates to a wear-resistant SPC composite wallboard and a preparation method thereof, and belongs to the technical field of building materials. The composite wallboard comprises at least an SPC base layer, a decorative layer and an encapsulation layer from the installation surface to the surface, wherein the components of the encapsulation layer are: a wear-resistant reinforcing agent 5.5-8.2wt%, a lubricant 0.9-1.1wt%, an antioxidant 0.12-0.18wt% and an ultraviolet absorber 0.06-0.09wt%, and the balance is PMMA resin; the wear-resistant reinforcing agent is subjected to an amine transesterification reaction by 5-nitro dimethyl isophthalate and n-alkyl diamine to form a low-molecular-weight chain compound, and then the nitro group is reduced by palladium-carbon catalysis, and finally a side chain amide modification is introduced by methylamino formyl chloride and the reduced amino group. The wear-resistant reinforcing agent has good compatibility with the PMMA matrix, forms an efficient hydrogen bond network to enhance the reinforcing effect, and maintains the high light transmittance and low haze of the wear-resistant layer.

Description

Technical Field

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

[0002] SPC (Stone Plastic Composite) wall panels, a new building decoration material, have attracted widespread attention for their excellent waterproof, impact-resistant, and environmentally friendly properties. Composite wall panels are primarily used as decorative materials. A decorative layer is typically added to the surface of the SPC base material, imparting a distinctive texture and enhancing decorative stability through encapsulation and protection. PMMA (polymethyl methacrylate), with its high transparency and gloss, is widely used as an encapsulation material for SPC wall panels. However, PMMA has limited abrasion resistance.

[0003] In order to improve the wear resistance of the PMMA-based encapsulation layer, the existing technology usually modifies it by adding a reinforcing phase, such as using nano-silica as the reinforcing phase, taking advantage of the transparency and high hardness of silica, and enhancing the wear resistance through blending. However, the dispersibility of nano-silica is limited, and silica forms a large number of heterogeneous interfaces in the PMMA matrix, resulting in a serious decline in the optical performance of the encapsulation layer, especially a serious deterioration in haze. There are also studies using organic materials for reinforcement to improve the wear resistance by enhancing the intermolecular forces of PMMA, such as using polymer nylon 6 for blending. The blending process of these polymer materials with PMMA is difficult, the intermolecular forces are relatively weak, and the strengthening effect on the encapsulation layer is not obvious. In addition, the interaction between the main chain amide and PMMA leads to molecular entanglement, forming an uneven bonding interface, which also deteriorates the optical properties. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background technology, the purpose of the present invention is to provide a wear-resistant SPC composite wallboard and a preparation method thereof.

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

[0006] A wear-resistant SPC composite wallboard comprises, from the installation surface to the surface, at least: an SPC base layer, a decorative layer, and an encapsulation layer. The encapsulation layer comprises: 5.5-8.2wt% of a wear-resistant enhancer, 0.9-1.1wt% of a lubricant, 0.12-0.18wt% of an antioxidant, and 0.06-0.09wt% of an ultraviolet absorber, with the balance being PMMA resin.

[0007] The wear-resistant reinforcing agent is prepared by the following method:

[0008] Step A1: Dissolve dimethyl 5-nitroisophthalate, n-alkyldiamine, and N-methylpyrrolidone, add tetrabutyl titanate and p-toluenesulfonic acid, mix, introduce dry nitrogen, preheat to 80-100°C, stir and react for 2-3 hours, then continue to heat to 120-130°C and continue to react for 1.2-1.6 hours. After the reaction is completed, cool, add water and wash, remove the aqueous phase, and vacuum dry to obtain an intermediate;

[0009] Furthermore, the feed ratio of 5-nitroisophthalic acid dimethyl ester, n-alkyl diamine, tetrabutyl titanate, p-toluenesulfonic acid and N-methyl pyrrolidone is 10 mmol: 11-13 mmol: 30-40 mg: 15-20 mg: 35-50 mL. Under high temperature catalysis, 5-nitroisophthalic acid dimethyl ester and n-alkyl diamine undergo amine ester exchange reaction to form a low molecular weight chain compound.

[0010] Furthermore, the length of the alkyl chain of the n-alkyldiamine is not less than C5, and the alkyl chain is introduced into the polymer backbone to improve the toughness of the chain and enhance the compatibility with the PMMA matrix.

[0011] Step A2: The intermediate and tetrahydrofuran are mixed and dispersed, palladium-carbon catalyst is added, the pressure is increased to 2-3 bar with hydrogen, the temperature is raised to 65-75°C, and the reaction is stirred for 4.5-6 hours. After the reaction is completed, the tetrahydrofuran is removed by rotary evaporation to obtain an aminated substrate;

[0012] Furthermore, the dispersion concentration of the intermediate in tetrahydrofuran is not higher than 20wt%, the palladium content in the palladium carbon catalyst is 8-11mol% of the nitro content in the intermediate, and the nitro group on the intermediate molecule is reduced with hydrogen under palladium carbon catalysis.

[0013] Step A3: Mix the aminated substrate, triethylamine, and anhydrous acetone, introduce dry nitrogen protection, control the temperature in an ice-water bath to no higher than 10°C, slowly add a solution of methylaminocarbonyl chloride in dichloromethane, and stir to react for 1.5-2 hours. Then, raise the temperature to 40-55°C and continue stirring to react for 10-15 hours. After the reaction is completed, remove the acetone by rotary evaporation, wash the substrate with water, remove the aqueous phase, and vacuum dry to obtain a wear-resistant enhancer.

[0014] Furthermore, the feed ratio of the aminated matrix, methylaminocarbonyl chloride, triethylamine and anhydrous acetone is 10 g: 30-40 mmol: 8-12 mL: 70-90 mL, and triethylamine is used as an acid binding agent to promote the reaction of methylaminocarbonyl chloride with the amino group in the aminated matrix and introduce side chain amide modification.

[0015] Preferably, the lubricant is polyethylene wax, which has a balanced lubricating effect, is beneficial to the molding of the encapsulation layer, and has little effect on the optical properties of the encapsulation.

[0016] Preferably, the antioxidant is a mixture of antioxidant 1076 and antioxidant 168, with a weight ratio of 1:0.15-0.2, and has good compatibility with the PMMA matrix.

[0017] Preferably, the ultraviolet absorber is ultraviolet absorber UV-531, which has good compatibility and stable yellowing retardation effect.

[0018] A method for preparing a wear-resistant SPC composite wallboard comprises the following steps:

[0019] Step S1: bonding the decorative layer to the surface of the SPC base layer to form a blank board;

[0020] Step S2: The raw materials of the encapsulation layer are mixed evenly, plasticized and extruded by a twin-screw extruder, and calendered to form a film, which is adhered to the surface of the blank board, and then hot-pressed and composited to obtain a wear-resistant SPC composite wallboard.

[0021] Furthermore, the plasticizing temperature of the encapsulation layer raw material is 220-230° C., the hot pressing compounding temperature is 160° C., and the hot pressing compounding pressure is 2.5 MPa.

[0022] Beneficial effects of the present invention:

[0023] The present invention is based on the existing PMMA encapsulation technology and introduces a wear-resistant reinforcing agent into the encapsulation layer to improve the wear resistance. Compared with the existing reinforcing phase, it has the following advantages:

[0024] 1. The main chain of the wear-resistant strengthener is rich in alkyl segments with similar polarity to PMMA, which makes it easy to achieve molecular-level compatibility, thereby achieving a uniform strengthening effect. At the same time, the alkyl segments in the main chain provide flexibility, avoiding the increase in brittleness caused by strengthening and preventing the generation of impact microcracks during wear.

[0025] 2. The side chain of the wear-resistant strengthener has an amide structure containing a benzene ring. The benzene ring is a strong electron-withdrawing group. It pulls the electron cloud toward itself through the conjugation effect, resulting in a decrease in the electron cloud density of the nitrogen atom in the amide group connected to it. Its lone pair of electrons is more inclined to form hydrogen bonds with the carbonyl group of PMMA, thereby enhancing the strength of the hydrogen bond. The benzene ring is a rigid planar structure that can fix the spatial orientation of the amide group so that its nitrogen and oxygen atoms face a specific direction. This directional arrangement makes it easier for the amide group to align with the carbonyl group of PMMA, thereby forming an efficient hydrogen bond network and enhancing the strengthening effect. In addition, the rigid structure of the benzene ring limits the free rotation of the molecular chain, restricts the amide structure on the main chain from participating in the formation of hydrogen bonds, reduces the formation of hydrogen bonds, and causes the molecular chain to entangle in space, reduces light scattering, and helps maintain the high light transmittance and low haze of the wear-resistant layer. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1: Preparation of wear-resistant SPC composite wallboard. The specific implementation process is as follows:

[0028] 1. Preparation of wear-resistant enhancer

[0029] Step A1: 5-nitroisophthalic acid dimethyl ester, 1,8-octanediamine, and N-methylpyrrolidone are mixed, and tetrabutyl titanate and p-toluenesulfonic acid are added and mixed. Dry nitrogen is introduced, and the temperature is pre-raised to 80°C and stirred for reaction for 3 hours. The temperature is then continued to be raised to 120°C and the reaction is continued for 1.6 hours. The feed ratio of 5-nitroisophthalic acid dimethyl ester, 1,8-octanediamine, tetrabutyl titanate, p-toluenesulfonic acid, and N-methylpyrrolidone is 10 mmol: 11 mmol: 30 mg: 15 mg: 35 mL. After the reaction is completed and cooled, water is added to wash, the aqueous phase is removed, and the mixture is vacuum dried to obtain an intermediate.

[0030] Step A2: The intermediate and tetrahydrofuran were mixed and dispersed to control the dispersion concentration of the intermediate to 15 wt%, and then a palladium carbon catalyst was added to control the palladium content to 8 mol% of the nitro content in the intermediate. The pressure was increased to 2ar with hydrogen, and the temperature was raised to 65 ° C. and stirred for 6 h. After the reaction was completed, the tetrahydrofuran was removed by rotary evaporation to obtain an aminated matrix.

[0031] Step A3: Take the aminated matrix, triethylamine and anhydrous acetone, mix them, pass dry nitrogen protection, control the temperature in an ice-water bath to no more than 10°C, slowly add a dichloromethane solution of methylaminocarbonyl chloride, and stir the reaction for 1.5 hours. Then raise the temperature to 40°C and continue stirring the reaction for 15 hours. The feed ratio of the aminated matrix, methylaminocarbonyl chloride, triethylamine and anhydrous acetone is 10g:30mmol:8mL:70mL. After the reaction is completed, the acetone is removed by rotary evaporation, the substrate is washed with water, the aqueous phase is removed and the substrate is vacuum dried to obtain a wear-resistant enhancer.

[0032] 2. Preparation of wear-resistant SPC composite wallboard

[0033] Step S1: Take the SPC base layer and the decorative layer, clean and remove dust from the surface of the SPC base layer, apply adhesive, attach the decorative layer, and roll-press and laminate them to form a blank board.

[0034] Step S2: Take the raw materials according to the ratio, 5.5wt% wear-resistant strengthener, which is homemade in this embodiment; 1.1wt% lubricant, J-1010P type polyethylene wax is selected; 0.12wt% antioxidant, antioxidant 1076 and antioxidant 168 are selected and mixed at a ratio of 1:0.15; 0.09wt% ultraviolet absorber, ultraviolet absorber UV-531 is selected; the remainder is CM211 type PMMA resin; mix the raw materials and add them to the twin-screw extruder, plasticize and extrude at 220°C, melt extruded into a calender, and formed into a film by calendering. The film is attached to the surface of the decorative layer of the blank and sent to the hot press. The hot pressing composite temperature is controlled to 160°C and the hot pressing composite pressure is 2.5MPa. The wear-resistant SPC composite wallboard is made by hot pressing composite.

[0035] Example 2, preparation of wear-resistant SPC composite wallboard, the specific implementation process is as follows:

[0036] 1. Preparation of wear-resistant enhancer

[0037] Step A1: 5-nitroisophthalic acid dimethyl ester, decanediamine and N-methylpyrrolidone are mixed, tetrabutyl titanate and p-toluenesulfonic acid are added and mixed, dry nitrogen is introduced, the temperature is pre-raised to 100°C and stirred for reaction for 2 hours, and then the temperature is continued to be raised to 130°C and the reaction is continued for 1.2 hours. The feed ratio of 5-nitroisophthalic acid dimethyl ester, 1,8-octanediamine, tetrabutyl titanate, p-toluenesulfonic acid and N-methylpyrrolidone is 10 mmol: 13 mmol: 40 mg: 20 mg: 50 mL. After the reaction is completed and cooled, water is added to wash, the aqueous phase is removed and the mixture is vacuum dried to obtain an intermediate.

[0038] Step A2: The intermediate and tetrahydrofuran were mixed and dispersed to control the dispersion concentration of the intermediate to 12 wt%, and then a palladium carbon catalyst was added to control the palladium content to 11 mol% of the nitro content in the intermediate. The pressure was increased to 3 bar with hydrogen, and the temperature was raised to 75 ° C. and stirred for 4.5 h. After the reaction was completed, the tetrahydrofuran was removed by rotary evaporation to obtain an aminated matrix.

[0039] Step A3: Mix the aminated matrix, triethylamine and anhydrous acetone, introduce dry nitrogen protection, control the temperature in an ice-water bath to no more than 10°C, slowly add a dichloromethane solution of methylaminocarbonyl chloride, and stir to react for 2 hours. Then, raise the temperature to 55°C and continue stirring to react for 10 hours. The feed ratio of the aminated matrix, methylaminocarbonyl chloride, triethylamine and anhydrous acetone is 10 g:40 mmol:12 mL:90 mL. After the reaction, remove the acetone by rotary evaporation, wash the substrate with water, remove the aqueous phase and vacuum dry to obtain a wear-resistant enhancer.

[0040] 2. Preparation of wear-resistant SPC composite wallboard

[0041] Step S1: Take the SPC base layer and the decorative layer, clean and remove dust from the surface of the SPC base layer, apply adhesive, attach the decorative layer, and roll-press and laminate them to form a blank board.

[0042] Step S2: Take the raw materials according to the ratio, 8.2wt% of the wear-resistant strengthener, which is homemade in this embodiment; 0.9wt% of the lubricant, J-1010P type polyethylene wax is selected; 0.18wt% of the antioxidant, antioxidant 1076 and antioxidant 168 are selected and mixed in a ratio of 1:0.2; 0.06wt% of the ultraviolet absorber, ultraviolet absorber UV-531 is selected; the remainder is CM211 type PMMA resin; the raw materials are mixed and added to the twin-screw extruder, plasticized and extruded at 230°C, and the melt is extruded into a calender, and a film is formed by calendering. The film is attached to the surface of the decorative layer of the blank and sent to the hot press. The hot pressing composite temperature is controlled to 160°C and the hot pressing composite pressure is 2.5MPa. The wear-resistant SPC composite wallboard is made by hot pressing composite.

[0043] Example 3, preparation of wear-resistant SPC composite wallboard, the specific implementation process is as follows:

[0044] 1. Preparation of wear-resistant enhancer

[0045] Step A1: 5-nitroisophthalic acid dimethyl ester, 1,8-octanediamine and N-methylpyrrolidone are mixed, tetrabutyl titanate and p-toluenesulfonic acid are added and mixed, dry nitrogen is introduced, the temperature is pre-raised to 85°C and stirred for reaction for 2.8 hours, and then the temperature is continued to be raised to 120°C and the reaction is continued for 1.5 hours. The feed ratio of 5-nitroisophthalic acid dimethyl ester, 1,8-octanediamine, tetrabutyl titanate, p-toluenesulfonic acid and N-methylpyrrolidone is 10 mmol:12 mmol:35 mg:15 mg:40 mL. After the reaction is completed and cooled, water is added to wash, the aqueous phase is removed, and the mixture is vacuum dried to obtain an intermediate.

[0046] Step A2: The intermediate and tetrahydrofuran were mixed and dispersed to control the dispersion concentration of the intermediate to 15 wt%, and then a palladium carbon catalyst was added to control the palladium content to 10 mol% of the nitro content in the intermediate. The pressure was increased to 2.5 bar with hydrogen, and the temperature was raised to 70 ° C. and stirred for 5.5 h. After the reaction was completed, the tetrahydrofuran was removed by rotary evaporation to obtain an aminated matrix.

[0047] Step A3: Take the aminated matrix, triethylamine and anhydrous acetone, mix them, pass dry nitrogen protection, control the temperature in an ice-water bath to no more than 10°C, slowly add a dichloromethane solution of methylaminocarbonyl chloride, and stir the reaction for 1.5 hours. Then raise the temperature to 45°C and continue stirring the reaction for 13 hours. The feed ratio of the aminated matrix, methylaminocarbonyl chloride, triethylamine and anhydrous acetone is 10g:35mmol:10mL:80mL. After the reaction is completed, the acetone is removed by rotary evaporation, the substrate is washed with water, the aqueous phase is removed and vacuum dried to obtain a wear-resistant enhancer.

[0048] 2. Preparation of wear-resistant SPC composite wallboard

[0049] Step S1: Take the SPC base layer and the decorative layer, clean and remove dust from the surface of the SPC base layer, apply adhesive, attach the decorative layer, and roll-press and laminate them to form a blank board.

[0050] Step S2: Take the raw materials according to the ratio, 6.8wt% of the wear-resistant strengthener is self-made in this embodiment; 1wt% of the lubricant is J-1010P polyethylene wax; 0.15wt% of the antioxidant is a mixture of antioxidant 1076 and antioxidant 168 at a ratio of 1:0.17; 0.08wt% of the ultraviolet absorber is UV-531; the remainder is CM211 PMMA resin; the raw materials are mixed and added to the twin-screw extruder, plasticized and extruded at 220°C, and the melt is extruded into a calender, and a film is formed by calendering. The film is adhered to the surface of the decorative layer of the blank and sent to the hot press. The hot pressing composite temperature is controlled to 160°C and the hot pressing composite pressure is 2.5MPa. The wear-resistant SPC composite wallboard is made by hot pressing composite.

[0051] Example 4, preparation of wear-resistant SPC composite wallboard, the specific implementation process is as follows:

[0052] 1. Preparation of wear-resistant enhancer

[0053] Step A1: Mix 5-nitroisophthalic acid dimethyl ester, decanediamine, and N-methylpyrrolidone, add tetrabutyl titanate and p-toluenesulfonic acid, and mix. Then, introduce dry nitrogen. Preheat to 90°C and stir to react for 2.6 hours. Then continue to heat to 130°C and continue to react for 1.4 hours. The feed ratio of 5-nitroisophthalic acid dimethyl ester, decanediamine, tetrabutyl titanate, p-toluenesulfonic acid, and N-methylpyrrolidone is 10 mmol:13 mmol:35 mg:20 mg:45 mL. After the reaction is completed and cooled, wash with water, remove the aqueous phase, and vacuum dry to obtain an intermediate.

[0054] Step A2: The intermediate and tetrahydrofuran were mixed and dispersed to control the dispersion concentration of the intermediate to 10 wt%, and then a palladium carbon catalyst was added to control the palladium content to 10 mol% of the nitro content in the intermediate. The pressure was increased to 3 bar with hydrogen, and the temperature was raised to 70 ° C. and stirred for 5 h. After the reaction was completed, the tetrahydrofuran was removed by rotary evaporation to obtain an aminated matrix.

[0055] Step A3: Take the aminated matrix, triethylamine and anhydrous acetone, mix them, pass dry nitrogen protection, control the temperature in an ice-water bath to no more than 10°C, slowly add a dichloromethane solution of methylaminocarbonyl chloride, and stir the reaction for 1.8 hours. Then raise the temperature to 50°C and continue stirring the reaction for 12 hours. The feed ratio of the aminated matrix, methylaminocarbonyl chloride, triethylamine and anhydrous acetone is 10g:40mmol:10mL:90mL. After the reaction is completed, the acetone is removed by rotary evaporation, the substrate is washed with water, the aqueous phase is removed and the substrate is vacuum dried to obtain a wear-resistant enhancer.

[0056] 2. Preparation of wear-resistant SPC composite wallboard

[0057] Step S1: Take the SPC base layer and the decorative layer, clean and remove dust from the surface of the SPC base layer, apply adhesive, attach the decorative layer, and roll-press and laminate them to form a blank board.

[0058] Step S2: Take the raw materials according to the ratio, 7.3wt% wear-resistant strengthener, which is homemade in this embodiment; 1wt% lubricant, J-1010P type polyethylene wax is selected; 0.16wt% antioxidant, antioxidant 1076 and antioxidant 168 are selected and mixed at a ratio of 1:0.17; 0.07wt% ultraviolet absorber, ultraviolet absorber UV-531 is selected; the balance is CM211 type PMMA resin; mix the raw materials and add them to the twin-screw extruder, plasticize and extrude at 220°C, melt extruded into a calender, and formed into a film by calendering. The film is attached to the surface of the decorative layer of the blank and sent to the hot press. The hot pressing composite temperature is controlled to 160°C and the hot pressing composite pressure is 2.5MPa. The wear-resistant SPC composite wallboard is made by hot pressing composite.

[0059] Comparative Example 1: This comparative example is a blank control. Referring to Example 4, no wear-resistant reinforcing agent is added to the raw material of the encapsulation layer, and the balance is supplemented with PMMA resin to 100wt%. The rest of the implementation process is exactly the same.

[0060] Comparative Example 2: This comparative example refers to Example 4, except that the wear-resistant reinforcing agent is replaced with commercially available 3051# low molecular weight polyamide resin, and the rest of the implementation process is exactly the same.

[0061] Comparative Example 3: This comparative example refers to the prior art, except that the wear-resistant enhancer is replaced with the same amount of VK-SP30S oleophilic nano-silica, and the rest of the implementation process is exactly the same.

[0062] To test the protective properties of the encapsulation layer, the calendered film produced during the encapsulation layer molding process was laminated to the surface of a flat mold with a release coating and then peeled off to produce a 0.5mm thick sheet specimen. Transmittance and haze were tested according to ASTM D1003-21; 60° gloss was tested according to ASTM D523-14; Taber abrasion (CS-10 grinding head) was tested according to ASTM D4060-14; and reciprocating abrasion (0000# steel wool) was tested according to ISO 12137-2011. The specific test results are shown in Table 1:

[0063] Table 1

[0064] It can be seen from the test data in Table 1 that, taking Comparative Example 1 as a reference, the encapsulation layers of the embodiment and the other comparative examples all have a certain wear-resistant enhancement effect. Among them, the wear resistance of Comparative Example 3 is significantly improved, but its light transmittance and haze performance are poor, which has a great impact on the aesthetics of the wallboard. The comprehensive improvement of the optical performance and wear resistance of Comparative Example 2 is low, and it is difficult to meet the high-performance wallboard encapsulation requirements.

[0065] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A wear-resistant SPC composite wall panel, comprising at least: SPC base layer, decorative layer and encapsulation layer, characterized in that the encapsulation layer comprises: 5.5-8.2wt% of wear-resistant enhancer, 0.9-1.1wt% of lubricant, 0.12-0.18wt% of antioxidant and 0.06-0.09wt% of ultraviolet absorber, and the balance is PMMA resin; The wear-resistant reinforcing agent is prepared by the following method: Step A1: Dissolve dimethyl 5-nitroisophthalate, n-alkyldiamine, and N-methylpyrrolidone, add tetrabutyl titanate and p-toluenesulfonic acid, mix, introduce dry nitrogen, preheat to 80-100°C, stir and react for 2-3 hours, then continue to heat to 120-130°C and continue to react for 1.2-1.6 hours to obtain an intermediate; Step A2: The intermediate and tetrahydrofuran are mixed and dispersed, palladium-carbon catalyst is added, the pressure is increased to 2-3 bar with hydrogen, the temperature is raised to 65-75°C, and the mixture is stirred and reacted for 4.5-6 hours to obtain an aminated matrix; Step A3: Mix the aminated matrix, triethylamine, and anhydrous acetone, introduce dry nitrogen protection, control the temperature in an ice-water bath to no higher than 10°C, slowly add a dichloromethane solution of methylaminoformyl chloride, and stir to react for 1.5-2 hours. Then, raise the temperature to 40-55°C and continue stirring to react for 10-15 hours to obtain a wear-resistant enhancer.

2. A wear-resistant SPC composite wallboard according to claim 1, characterized in that: The feed ratio of dimethyl 5-nitroisophthalate, n-alkyldiamine, tetrabutyl titanate, p-toluenesulfonic acid and N-methylpyrrolidone is 10 mmol: 11-13 mmol: 30-40 mg: 15-20 mg: 35-50 mL.

3. A wear-resistant SPC composite wallboard according to claim 2, characterized in that: The alkyl chain length of the n-alkyldiamine is not less than C5.

4. The wear-resistant SPC composite wallboard according to claim 2, characterized in that: The dispersion concentration of the intermediate in tetrahydrofuran is not higher than 20 wt %, and the content of palladium in the palladium-carbon catalyst is 8-11 mol % of the nitro content in the intermediate.

5. The wear-resistant SPC composite wallboard according to claim 2, characterized in that: The feeding ratio of the amination substrate, methylaminocarbonyl chloride, triethylamine and anhydrous acetone is 10 g: 30-40 mmol: 8-12 mL: 70-90 mL.

6. The wear-resistant SPC composite wallboard according to claim 1, characterized in that: The lubricant is polyethylene wax.

7. The wear-resistant SPC composite wallboard according to claim 1, characterized in that: The antioxidant is a mixture of antioxidant 1076 and antioxidant 168.

8. The wear-resistant SPC composite wallboard according to claim 1, characterized in that: The ultraviolet absorber is ultraviolet absorber UV-531.

9. A method for preparing the wear-resistant SPC composite wallboard according to any one of claims 1 to 8, characterized in that: The steps include: Step S1: bonding the decorative layer to the surface of the SPC base layer to form a blank board; Step S2: The raw materials of the encapsulation layer are mixed evenly, plasticized and extruded by a twin-screw extruder, and calendered to form a film, which is adhered to the surface of the blank board, and then hot-pressed and composited to obtain a wear-resistant SPC composite wallboard.

10. The method for preparing a wear-resistant SPC composite wallboard according to claim 9, characterized in that: The plasticizing temperature of the packaging layer raw material is 220-230°C, the hot pressing compounding temperature is 160°C, and the hot pressing compounding pressure is 2.5MPa.

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