PP matte wear-resistant surface material and preparation method thereof

Abstract

The invention relates to the field of wear-resistant materials, in particular to a PP matte wear-resistant surface material and a preparation method thereof.The PP matte wear-resistant surface material is prepared from, by weight, 80 parts of PP resin, 5-20 parts of filler, 1-10 parts of extinction material, 1-3 parts of light stabilizer, 0.3-0.9 part of zinc stearate, 1-1.5 parts of coupling agent and 1-3 parts of coloring agent; the filler comprises at least one of silica fume powder, talcum powder and aluminum oxide. The PP resin provides basic support, the matt material and the filler are matched, the matt material directly reduces the surface gloss, irregular particles of the filler can increase the surface microscopic roughness and further scatter light, the surface gloss of the material is low and uniform, the ideal matte texture is achieved, and in addition, the surface gloss of the material is improved. Due to the existence of the filler, the hardness of the material surface can be remarkably improved, the abrasion of the PP matrix in the friction process is reduced, and the abrasion resistance of the PP matte abrasion-resistant surface material is improved, so that the abrasion resistance of the automobile window outer water cut is improved.

Description

Technical Field

[0001] This application relates to the field of wear-resistant materials, and in particular to a matte wear-resistant PP surface material and its preparation method. Background Technology

[0002] The exterior windshield washer of a car window is a long, strip-shaped component installed along the upper edge of the car door and on the outer side of the window glass. Located between the door panel and the window glass, it is an important part of the door system. Because the outer surface of the windshield was frequently rubbed and scratched by passengers' hands, clothing, car wash tools, tree branches, etc., it is often necessary to coat the surface of the exterior windshield with a wear-resistant material.

[0003] Existing automotive exterior windshield deflectors often employ solutions such as TPV (thermoplastic elastomer), EPDM (ethylene propylene diene monomer) coated plastic, surface-coated with special coatings (such as polyurethane or fluorocarbon coatings), or composite low-friction materials. To address the aforementioned technical problems, this application provides a matte, wear-resistant PP surface material and its preparation method. Summary of the Invention

[0004] To improve the abrasion resistance of automotive window water deflectors, this application provides a matte abrasion-resistant PP surface material for automotive window water deflectors and its preparation method.

[0005] Firstly, this application provides a matte, wear-resistant PP surface material, which adopts the following technical solution: A matte wear-resistant PP surface material comprises the following components in parts by weight: 80 parts PP resin, 5-20 parts filler, 1-10 parts matting material, 1-3 parts light stabilizer, 0.3-0.9 parts zinc stearate, 1-1.5 parts coupling agent, and 1-3 parts colorant. The filler includes at least one of silica fume, talc, and alumina.

[0006] The filler is a mixture of silica fume, talc, and alumina, with a mass ratio of silica fume, talc, and alumina of (2-5):(0.5-2):1.

[0007] By adopting the above technical solutions, PP material has good mechanical strength and rigidity, providing basic support, and has good resistance to acids, alkalis, salts, oils and common car cleaners. It is not easily corroded or swollen, and it is conducive to lightweight design. Furthermore, through the combination of matte material and filler, the matte material directly reduces the surface gloss, and the irregular particles of the filler can increase the micro-roughness of the surface, further scattering light, making the surface gloss of the material low and uniform, achieving the ideal matte texture. In addition, the presence of filler can significantly improve the surface hardness of the material, reduce the wear of the PP matrix during friction, and improve the wear resistance of PP matte wear-resistant surface material.

[0008] Silica fume, talc, and alumina are compounded into a filler. Talc provides high rigidity and dimensional stability, while silica fume significantly enhances wear resistance and filling density with its fine particle size and high hardness. Alumina, as a top-grade hard filler, further strengthens key wear-resistant points. The particle size distribution of the three components helps improve filling efficiency and material uniformity. Under the action of a coupling agent, they jointly construct a multi-layered wear-resistant network, improving the wear resistance of matte PP wear-resistant surface materials. At the same time, they work synergistically with a matting agent to achieve a more uniform and stable matte effect.

[0009] When the proportion of silica fume is too high, it is prone to agglomeration, forming "hard spot" defects, which will peel off and aggravate scratches during the wear process. When the proportion of talc is too high, the flaky structure of talc is excessively layered, which leads to a significant increase in the brittleness of PP matte wear-resistant surface material. In addition, the surface of PP matte wear-resistant surface material produces local high-gloss spots due to the directional arrangement of lamellar crystals, which destroys the uniformity of matte finish. When the proportion of alumina is too high, the enrichment of alumina will cause the continuity of PP resin matrix to be broken, resulting in stress concentration, decreased impact toughness, and surface roughening, which makes the matte effect out of control.

[0010] Preferably, the coupling agent is isopropyl distearate aluminum ester.

[0011] By adopting the above technical solution, the molecular structure of isopropyl distearate aluminate has both "inorganic-loving groups" and "organic-loving groups". The aluminum center in the molecule can undergo chemical adsorption or bonding reaction with inorganic fillers (silica fume, talc, alumina) to form a stable "filler-coupling agent" interface layer, eliminating the polarity of the filler surface. The long-chain stearyloxy group in the molecule is a non-polar structure with excellent compatibility with the polyolefin segments of PP resin. It can be integrated into the PP matrix through intermolecular forces, thereby breaking the agglomeration of inorganic fillers and making them uniformly dispersed in PP resin, laying the foundation for the wear resistance and matte stability of PP matte wear-resistant surface material.

[0012] Preferably, the matte wear-resistant PP surface material also contains ethyl orthosilicate.

[0013] By adopting the above technical solution, the addition of tetraethyl orthosilicate can undergo a hydrolysis and condensation reaction on the surface of the filler to form a layer of silicate oligomer or silica film, which further reduces the polarity of the inorganic filler surface. In addition, the silicate oligomer has certain polar groups, which can coat the surface of the filler particles to form a steric hindrance effect, reduce the attraction between particles, and thus inhibit agglomeration.

[0014] Furthermore, tetraethyl orthosilicate hydrolyzes to form silicic acid when exposed to trace amounts of moisture. The silicic acid further condenses to form a three-dimensional siloxane network, which can intertwine with the aluminum oxide in the aluminate coupling agent to form a "silicon-aluminum interpenetrating network". This improves the interfacial bonding force between the filler and the PP matrix, effectively resisting external friction and scratches. In addition, the formation of the "silicon-aluminum interpenetrating network" restricts the thermal movement of PP molecular chains, thereby enhancing the heat aging resistance of the matte wear-resistant PP surface material.

[0015] Preferably, the mass ratio of the tetraethyl orthosilicate to isopropyl distearate is 0.5-1:1.

[0016] By adopting the above technical solution, when the proportion of isopropyl distearyloxyaluminate is too high, the excess of isopropyl distearyloxyaluminate causes most of the active sites on the filler surface to be occupied by aluminate molecules, leaving less hydroxyl groups for the reaction of tetraethyl orthosilicate. This results in the discontinuity and non-density of the Si-O-Si network generated by the hydrolysis and condensation of tetraethyl orthosilicate, weakening the silicon-aluminum interpenetrating network structure. During the friction process, the filler is more likely to fall off, which reduces the wear resistance of the PP matte wear-resistant surface material. In addition, the excessive stearyl long chains accumulate on the surface, making the surface "smoother" and reducing the matting effect of the PP matte wear-resistant surface material.

[0017] When the proportion of isopropyl distearate is too low, the amount of tetraethyl orthosilicate is excessive, and the Si-O-Si network formed by hydrolysis and condensation is too thick and has a high cross-linking density. However, the insufficient addition of isopropyl distearate leads to insufficient bonding force with the PP matrix, making the PP matte wear-resistant surface material prone to interfacial peeling when subjected to external force or friction. Furthermore, the thick and hard Si-O-Si network lacks flexible buffering, making it difficult to absorb impact energy.

[0018] Preferably, the light stabilizer is at least one of hindered amine light stabilizers and ultraviolet absorber UV-326.

[0019] Preferably, the light stabilizer is a hindered amine light stabilizer.

[0020] By adopting the above technical solution, the molecular structure of the hindered amine light stabilizer contains a hindered piperidine group, which can capture alkyl free radicals and alkyl peroxy free radicals generated by the breakage of PP molecular chains and convert them into stable nitroxide free radicals. The nitroxide free radicals can quench the active free radicals to generate inactive products, and at the same time regenerate into amine groups to complete the cycle, maintaining the integrity of the filler-resin interface.

[0021] In UV-326, the hydroxyl group in the benzotriazole structure forms an intramolecular hydrogen bond with the adjacent nitrogen atom. When absorbing ultraviolet light, the hydrogen bond breaks and excites electrons to jump to the excited state. Subsequently, through proton transfer and structural rearrangement, the ultraviolet energy is converted into low-order heat energy and released, and finally the stable hydrogen bond structure is restored, realizing cyclic ultraviolet interception and delaying the breakage of resin molecular chains.

[0022] Preferably, the matte wear-resistant PP surface material also contains the antioxidant DLTP.

[0023] By adopting the above technical solution, the molecular structure of antioxidant DLTP contains thioether bonds. Thioether bonds have strong reducing properties and can decompose hydroperoxides and convert them into stable alcohols and disulfides, thus preventing further decomposition of hydroperoxides to generate free radicals. The disulfides generated by the oxidation of antioxidant DLTP can also combine with alkyl free radicals in the system to terminate the growth of the oxidation chain.

[0024] By combining hindered amine light stabilizers with the antioxidant DLTP, the hindered amine light stabilizer addresses the "photo-induced free radical chain reaction," protecting against surface aging caused by ultraviolet light, while the antioxidant DLTP addresses the "thermal-induced accumulation of hydrogen peroxide," protecting against internal aging caused by high processing temperatures and long-term thermal environments. Furthermore, during the thermo-oxidative aging process of PP, the antioxidant DLTP is first oxidized to monosulfides, and then further reacts with hydrogen peroxides to release thiols. These thiols can react with the nitrile radicals of the hindered amine light stabilizer to regenerate it, significantly reducing the consumption rate of the hindered amine light stabilizer and thus improving the weather resistance of matte, wear-resistant PP surface materials.

[0025] Secondly, this application provides a method for preparing a matte, wear-resistant PP surface material, which employs the following technical solution: A method for preparing a matte, wear-resistant PP surface material includes the following steps: S1. Mix and stir the formulated amounts of PP resin, filler, matting material, light stabilizer, zinc stearate, coupling agent and colorant to obtain a mixture; S2. Extrude and granulate the mixture to obtain PP matte wear-resistant surface material.

[0026] By adopting the above technical solution, the raw materials such as PP resin, fillers (silica fume, talc and alumina), matting materials, light stabilizers, zinc stearate, coupling agents and colorants are heated and mixed, which can ensure that these components are fully dispersed in the mixture.

[0027] During the heating and mixing process, additives such as zinc stearate, light stabilizers, and coupling agents can interact with PP resin and fillers to form a denser and more stable microstructure. This interaction helps to improve the rigidity and abrasion resistance of matte PP abrasion-resistant surface materials.

[0028] Preferably, in S1, the formulated amounts of tetraethyl orthosilicate and / or antioxidant DLTP are added and mixed with PP resin, filler, matting material, light stabilizer, zinc stearate, coupling agent and colorant to obtain a mixture.

[0029] By adopting the above technical solution, in the S1 stage, the aluminate coupling agent has begun to react with the hydroxyl groups on the filler surface. The Si-OH of the tetraethyl orthosilicate hydrolysis product can react with the Al-OH of the aluminate to form Al-O-Si chemical bonds, thus initially constructing the prototype of a "silicon-aluminum interpenetrating network". The addition of antioxidants can work in conjunction with light stabilizers and coupling agents to further improve the weather resistance of PP matte wear-resistant surface materials.

[0030] In summary, this application includes at least one of the following beneficial technical effects: 1. This application uses PP resin to provide basic support, and then through the combination of matte material and filler, the matte material directly reduces the surface gloss, and the irregular particles of the filler can increase the micro-roughness of the surface, further scattering light, so that the gloss of the material surface is low and uniform, achieving an ideal matte texture. In addition, the presence of filler can significantly improve the surface hardness of the material, reduce the wear of the PP matrix during the friction process, and improve the wear resistance of the PP matte wear-resistant surface material. 2. The addition of tetraethyl orthosilicate in this application can undergo hydrolysis and condensation reaction on the surface of the filler to form a layer of silicate oligomer or silica film, which further reduces the polarity of the inorganic filler surface and inhibits agglomeration. In addition, tetraethyl orthosilicate can interweave with aluminum oxide in aluminate coupling agent to form a "silicon-aluminum interpenetrating network", which improves the interfacial bonding force between the filler and the PP matrix and can effectively resist external friction and scratches. Furthermore, the formation of the "silicon-aluminum interpenetrating network" will restrict the thermal movement of PP molecular chains, thereby enhancing the heat aging resistance of PP matte wear-resistant surface material. 3. This application utilizes the synergy between a hindered amine light stabilizer and the antioxidant DLTP. The hindered amine light stabilizer addresses the "photo-induced free radical chain reaction," protecting against surface aging caused by ultraviolet light, while the antioxidant DLTP addresses the "thermal-induced accumulation of hydrogen peroxide," protecting against internal aging caused by high processing temperatures and long-term thermal environments. Furthermore, during the thermo-oxidative aging process of PP, the antioxidant DLTP is first oxidized to monosulfides, and then further reacts with hydrogen peroxides to release thiols. These thiols can react with the nitrile free radicals of the hindered amine light stabilizer to regenerate it, significantly reducing the consumption rate of the hindered amine light stabilizer and thus improving the weather resistance of the matte wear-resistant PP surface material. Detailed Implementation

[0031] The raw materials in this application include the following: PP resin: Polypropylene resin, using commercially available products with CAS number 9003-07-0; Silica fume: Commercially available product from Universal Minerals; Talc powder: Commercially available product from Beihai Company; Alumina: Commercially available product with CAS number 11092-32-3 is used; Matting material: Evonik's OK500 commercially available product; Hindered amine light stabilizers: Light stabilizer 622, light stabilizer 944, etc. can be selected. This application takes light stabilizer 622 with CAS number 65447-77-0 as an example. UV absorber UV-326: Uses a commercially available product with CAS number 3896-11-5; Zinc stearate: Use commercially available product with CAS number 557-05-1; Isopropyl distearate aluminate: Use the commercially available product with CAS number 5919-73-3; KH-550: Uses a commercially available product with CAS number 919-30-2; Ethyl orthosilicate: Use commercially available product with CAS number 78-10-4; KR-TTS: Uses a commercially available product with CAS number 136144-62-2; Colorant: Taking carbon black with CAS number 1333-86-4 as an example; Antioxidant DLTP: Uses commercially available products with CAS number 123-28-4.

[0032] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0033] Example 1 Example 1 A method for preparing a matte, wear-resistant PP surface material includes the following steps: S1. Mix 80g PP resin, 15g filler, 5g matting material, 2g light stabilizer 622, 0.6g zinc stearate, 1.2g isopropyl distearate aluminate and 2g carbon black to obtain a mixture; S2. Place the mixture in a twin-screw extruder and granulate it at 190-220℃ to obtain PP matte wear-resistant surface material.

[0034] The filler is a mixture of silica fume, talc, and alumina, with a mass ratio of 3:1:1. The filler is first placed in a hot air circulating drying oven and dried at 100°C for 3 hours until the moisture content is 0.05-0.15%, and then added to the reaction system.

[0035] Example 2-3 Examples 2-3 are based on the preparation method of Example 1, but the composition of the PP matte wear-resistant surface material is adjusted as shown in Table 1.

[0036] Comparative Examples 1-2 Comparative Examples 1-2 are based on the preparation method of Example 1, but the composition of the PP matte wear-resistant surface material is adjusted as shown in Table 1.

[0037] Performance testing The PP matte abrasion-resistant surface materials of Examples 1-3 and Comparative Examples 1-2 were analyzed, and the specific testing methods are as follows: 1. Gloss The gloss of PP matte abrasion-resistant surface material was tested using a 60° angle gloss meter.

[0038] 2. Wear resistance The scratch resistance of PP matte abrasion-resistant surface material was determined according to Method A in GMW 14688, with a load of 10N, and the cross scratch ΔL value was recorded.

[0039] Based on the above detection method, the test results of Examples 1-3 and Comparative Examples 1-2 were obtained, as shown in Table 1 below.

[0040] Table 1. Composition and performance test results of PP matte abrasion-resistant surface materials in Examples 1-3 and Comparative Examples 1-2.

[0041] Referring to Table 1, comparing Examples 1-3 and Comparative Examples 1-2, it can be seen that the performance of the PP matte wear-resistant surface material of Examples 1-3 is better than that of the PP matte wear-resistant surface material of Comparative Examples 1-2. This may be because, through the combination of matte material and filler, the matte material directly reduces the surface gloss, and the irregular particles of the filler can increase the micro-roughness of the surface, further scattering light, making the surface gloss of the material low and uniform, achieving the ideal matte texture. In addition, the presence of filler can significantly improve the surface hardness of the material, reduce the wear of the PP matrix during friction, and improve the wear resistance of the PP matte wear-resistant surface material.

[0042] Examples 4-6 Examples 4-6 are based on the preparation method of Example 1, but the composition of the filler is adjusted, as shown in Table 2.

[0043] The PP matte wear-resistant surface materials of Examples 4-6 were subjected to the above-mentioned performance tests, and the test results are shown in Table 2.

[0044] Table 2. Packing material composition and performance test results for Examples 1 and 4-6

[0045] Referring to Table 2, a comparison of Examples 1 and 4-6 shows that the PP matte wear-resistant surface material of Example 1 performs better than that of Examples 4-6. This may be because silica fume, talc, and alumina are compounded into fillers. Talc provides high rigidity and dimensional stability, silica fume significantly enhances wear resistance and filling density with its fine particle size and high hardness, and alumina, as a top-grade hard filler, further strengthens key wear-resistant points. The three components work together under the action of coupling agent to construct a multi-layer wear-resistant network, improving the wear resistance of the PP matte wear-resistant surface material, while synergistically achieving a more uniform and stable matte effect with the matting agent.

[0046] Examples 7-10 Examples 7-10 are based on the preparation method of Example 1, but the mass ratio of silica fume, talc and alumina is adjusted as shown in Table 3.

[0047] Performance testing The PP matte abrasion-resistant surface materials of Examples 1 and 7-10 were analyzed, and the specific testing methods are as follows: 1. Tensile strength The tensile strength of PP matte abrasion-resistant surface material was tested according to the method specified in ISO 527-2.

[0048] Based on the above detection method, the test results of Examples 1 and 7-10 were obtained, as shown in Table 3 below.

[0049] Table 3. Mass ratio and performance test results of silica fume, talc, and alumina in Examples 1 and 7-10.

[0050] Referring to Table 3, comparing Examples 1 and 7-10, it can be seen that the PP matte wear-resistant surface material has the best performance when the mass ratio of silica fume, talc, and alumina is (2-5):(0.5-2):1. This may be because when the proportion of silica fume is too high, silica fume is prone to agglomeration, forming "hard spot" defects, which will peel off and aggravate scratches during the wear process; when the proportion of talc is too high, the flaky structure of talc is excessively layered, which leads to a significant increase in the brittleness of the PP matte wear-resistant surface material, and the surface of the PP matte wear-resistant surface material produces local high-gloss spots due to the directional arrangement of lamellar crystals, which destroys the uniformity of matte finish; when the proportion of alumina is too high, the enrichment of alumina will cause the continuity of the PP resin matrix to be broken, resulting in stress concentration, decreased impact toughness, and surface roughening, which makes the matte effect out of control.

[0051] Examples 11-12 Examples 11-12 are based on the preparation method of Example 1, but the type of coupling agent is adjusted, as shown in Table 4.

[0052] Performance testing The PP matte abrasion-resistant surface materials of Examples 1 and 11-12 were analyzed, and the specific testing methods are as follows: 1. Impact toughness The impact toughness of PP matte abrasion-resistant surface material was tested according to the method specified in ISO 179-1 / 1eA.

[0053] Based on the above detection method, the test results of Example 1 and Examples 11-12 were obtained, as shown in Table 4 below.

[0054] Table 4. Types of coupling agents and performance test results for Examples 1 and 11-12

[0055] Referring to Table 4, a comparison of Example 1 and Examples 11-12 shows that the PP matte wear-resistant surface material of Example 1 has the best performance. This may be because the molecular structure of isopropyl distearyloxyaluminate has both "inorganic-loving groups" and "organic-loving groups". The aluminum center in the molecule can undergo chemical adsorption or bonding reaction with inorganic fillers to form a stable "filler-coupling agent" interface layer, eliminating the polarity of the filler surface. The long-chain stearyloxy group in the molecule is a non-polar structure with excellent compatibility with the polyolefin segments of PP resin. It can be integrated into the PP matrix through intermolecular forces, thereby breaking the agglomeration of inorganic fillers and making them uniformly dispersed in PP resin, laying the foundation for the wear resistance and matte stability of PP matte wear-resistant surface material. Example 13

[0056] Example 13: Based on the preparation method of Example 1, tetraethyl orthosilicate, PP resin, filler, matting material, light stabilizer, zinc stearate, coupling agent, and colorant were added to S1 and mixed and stirred to obtain a mixture, with other conditions remaining unchanged. The mass ratio of tetraethyl orthosilicate to isopropyl distearate aluminate was 0.8:1.

[0057] Examples 14-17 Examples 14-17 are based on the preparation method of Example 13, but the mixing mass ratio of tetraethyl orthosilicate and isopropyl distearate aluminate is adjusted as shown in Table 5.

[0058] The PP abrasion-resistant surface materials of Examples 13-17 were subjected to the above-mentioned performance tests, and the test results are shown in Table 5.

[0059] Table 5. Mixed mass ratio and performance test results of tetraethyl orthosilicate and isopropyl distearate in Examples 1 and 13-17.

[0060] Referring to Table 5, comparing Examples 1 and 13-17, it can be seen that the addition of tetraethyl orthosilicate can undergo a hydrolysis-condensation reaction on the surface of the filler, forming a layer of silicate oligomer or silica film, further reducing the polarity of the inorganic filler surface. Furthermore, the silicate oligomer has certain polar groups that can coat the surface of the filler particles, creating a steric hindrance effect, reducing the attraction between particles, and thus inhibiting agglomeration. In addition, tetraethyl orthosilicate hydrolyzes with trace amounts of water to generate silicic acid, which further condenses to form a three-dimensional siloxane network. This network can interweave with the aluminum oxide in the aluminate coupling agent to form a "silicon-aluminum interpenetrating network," improving the interfacial bonding force between the filler and the PP matrix, effectively resisting external friction and scratches. Moreover, the formation of the "silicon-aluminum interpenetrating network" restricts the thermal movement of the PP molecular chains, enhancing the heat aging resistance of the matte wear-resistant PP surface material. Example 18

[0061] Example 18 is based on the preparation method of Example 1, except that 2g of light stabilizer 622 is replaced with 2g of ultraviolet absorber UV-326, and the other conditions remain unchanged.

[0062] Performance testing The PP matte abrasion-resistant surface materials of Examples 1 and 18 were analyzed using the following specific testing methods: 1. Photoaging resistance According to the test method specified in GB / T 16422.2-2014, after placing the PP matte abrasion-resistant surface material under a xenon lamp for 1000 hours, the tensile strength and elongation at break of the PP matte abrasion-resistant surface material were tested and compared with the tensile strength and elongation at break before irradiation to obtain the tensile strength retention rate and elongation at break retention rate.

[0063] Based on the above detection method, the test results of Example 1 and Example 18 were obtained, as shown in Table 6 below.

[0064] Table 6 Performance test results for Examples 1 and 18

[0065] Referring to Table 6, a comparison of Example 1 and Example 18 shows that the PP matte wear-resistant surface material of Example 1 has the best performance. This may be because the tetramethylpiperidin group of the hindered amine light stabilizer can undergo weak proton exchange with the primary amino group in the aminosilane coupling agent at high processing temperatures, which promotes the directional enrichment of hindered amine light stabilizer molecules at the filler-resin interface, so that the free radical scavenging sites accurately cover the most vulnerable photoaging initiation region. In addition, the presence of the aminosilane coupling agent can provide the alkaline environment required for the hindered amine light stabilizer to function. Example 19

[0066] In Example 19, based on the preparation method of Example 1, 0.2g of antioxidant 168 was added to S1 and mixed with PP resin, filler, matting material, light stabilizer, zinc stearate, coupling agent and colorant to obtain a mixture, while the other conditions remained unchanged. Example 20

[0067] Example 20: Based on the preparation method of Example 13, in S1, 0.2g of antioxidant 168 was added and mixed with PP resin, filler, matting material, light stabilizer, zinc stearate, coupling agent and colorant to obtain a mixture, while the other conditions remained unchanged.

[0068] Performance testing The PP matte abrasion-resistant surface materials from Examples 1 and 19-20 were analyzed using the following specific testing methods: 1. Heat aging resistance The matte PP abrasion-resistant surface material was placed in a recirculating air oven (NH-401S hot air circulating dryer manufactured by Nagano Scientific Machinery Manufacturing Co., Ltd.) and heat-treated at 200°C for 1000 hours. Then, the tensile strength and elongation at break of the matte PP abrasion-resistant surface material were tested and compared with the tensile strength and elongation at break before irradiation to obtain the tensile strength retention rate and elongation at break retention rate.

[0069] The PP matte wear-resistant surface materials of Examples 19-20 were subjected to the above-mentioned performance tests, and the test results are shown in Table 7.

[0070] Table 7 Performance test results for Examples 1 and 19-20

[0071] Referring to Table 7, a comparison of Examples 1 and 19-20 shows that the addition of antioxidant DLTP significantly improves the weather resistance of matte, wear-resistant PP surface materials. This is likely because the molecular structure of antioxidant DLTP contains thioether bonds, which have strong reducing properties and can decompose hydroperoxides, converting them into stable alcohols and disulfides, thus preventing further decomposition of hydroperoxides and the generation of free radicals. The disulfides generated by the oxidation of antioxidant DLTP can also combine with alkyl free radicals in the system, terminating the oxidation chain growth. Furthermore, through the synergy between hindered amine light stabilizers and antioxidant DLTP, the hindered amine light stabilizers address the "photo-induced free radical chain reaction," protecting against surface aging caused by ultraviolet light, while antioxidant DLTP addresses the "heat-induced accumulation of hydroperoxides," protecting against internal aging caused by high processing temperatures and long-term thermal environments. Furthermore, during the thermo-oxidative aging process of PP, the antioxidant DLTP is first oxidized into monosulfide, and then further reacts with hydroperoxide to release thiols. The thiols can react with the nitric oxide radicals of the hindered amine light stabilizer to regenerate the hindered amine light stabilizer, significantly reducing the consumption rate of the hindered amine light stabilizer, thereby improving the weather resistance of PP matte wear-resistant surface material.

[0072] Furthermore, the addition of tetraethyl orthosilicate can form a "silicon-aluminum interpenetrating network" with isopropyl distearate aluminate. The presence of this "silicon-aluminum interpenetrating network" also allows the SiO2 and Al2O3 in the silicon-aluminum oxide network to have a strong ability to reflect and absorb ultraviolet light, thus forming a "physical ultraviolet barrier" to reduce the direct penetration of ultraviolet light into the PP matrix and slow down the degradation of the PP molecular chain.

[0073] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A matte, wear-resistant PP surface material, characterized in that, It includes the following components in parts by weight: 80 parts PP resin, 5-20 parts filler, 1-10 parts matting material, 1-3 parts light stabilizer, 0.3-0.9 parts zinc stearate, 1-1.5 parts coupling agent, and 1-3 parts colorant; The filler includes at least one of silica fume, talc, and alumina.

2. The PP matte wear-resistant surface material according to claim 1, characterized in that, The filler is a mixture of silica fume, talc, and alumina, with a mass ratio of silica fume, talc, and alumina of (2-5):(0.5-2):

1.

3. The PP matte wear-resistant surface material according to claim 1, characterized in that, The coupling agent is isopropyl distearate aluminum ester.

4. The PP matte wear-resistant surface material according to claim 3, characterized in that, It also contains tetraethyl orthosilicate.

5. The PP matte wear-resistant surface material according to claim 4, characterized in that, The mass ratio of tetraethyl orthosilicate to isopropyl distearate aluminate is 0.5-1:

1.

6. The PP matte wear-resistant surface material according to claim 1, characterized in that, The light stabilizer is at least one of hindered amine light stabilizers and ultraviolet absorber UV-326.

7. The PP matte wear-resistant surface material according to claim 6, characterized in that, The light stabilizer is a hindered amine light stabilizer.

8. The PP matte wear-resistant surface material according to claim 7, characterized in that, It also contains the antioxidant DLTP.

9. A method for preparing a matte, wear-resistant PP surface material according to claims 1-8, characterized in that, Includes the following steps: S1. Mix and stir the formulated amounts of PP resin, filler, matting material, light stabilizer, zinc stearate, coupling agent and colorant to obtain a mixture; S2. Extrude and granulate the mixture to obtain PP matte wear-resistant surface material.

10. The method for preparing a matte, wear-resistant PP surface material according to claim 9, characterized in that, In S1, the formulated amounts of tetraethyl orthosilicate and / or antioxidant DLTP are added and mixed with PP resin, filler, matting material, light stabilizer, zinc stearate, coupling agent and colorant to obtain a mixture.

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