Antiskid automobile foot mat coiled material formula and preparation method thereof

Abstract

The invention relates to the field of automobile foot mats, in particular to an anti-skid automobile foot mat coiled material formula and a preparation method of the anti-skid automobile foot mat coiled material formula. 3%-8% of modified polyrotaxane; 5%-10% of an anti-slip agent; 8%-18% of a plasticizer; 1%-4% of a stabilizer; 5%-12% of a functional filler; and 0.5%-3% of a coupling agent. Based on the dynamic sliding crosslinking of the modified polyrotaxane and the synergistic enhancement effect of the nanosheet layer filler, the material shows the rigid-flexible balance characteristic, the reversible sliding mechanism of the molecular chain of the material endows the coiled material with excellent tear resistance and deformation recovery capability, and in a composite anti-slip system, the anti-slip performance of the coiled material is greatly improved. The surface-modified nano-diamond micro-powder improves the microcosmic roughness through a mechanical interlocking effect, the polar group of carboxyl-terminated polydimethylsiloxane enhances the interface adhesive force, the material keeps a stable high friction coefficient in a dry and wet environment through the synergistic effect of the nano-diamond micro-powder and the polar group of carboxyl-terminated polydimethylsiloxane, and the contact stability of the foot pad and an automobile floor is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the field of automobile floor mats, and particularly relates to a formula of an anti-skid automobile floor mat coil and a preparation method thereof. Background Art

[0002] Car floor mat rolls are a type of functional material specifically used for car interiors. They are usually produced in continuous roll form and can be processed into car floor mats of various specifications through cutting, molding and other processes. Car floor mats are usually made of polymer materials (such as polyvinyl chloride, thermoplastic elastomers, etc.) as the base material, combined with plasticizers, stabilizers, anti-slip agents and other additives. They are flexible, wear-resistant and stain-resistant. Some high-end products also have flame retardant, sound insulation or environmentally friendly properties.

[0003] Car floor mats play an important role in car interiors. They not only protect the car floor but also enhance the aesthetics and comfort of the car interior. However, existing car floor mat rolls have deficiencies in anti-slip and mechanical properties. Traditional formulations and preparation processes are unable to meet the market demand for high-quality, high-performance car floor mat rolls. In addition, unreasonable flow channel structure during the extrusion molding process can easily lead to uneven material distribution, affecting product quality. Summary of the Invention

[0004] In order to overcome the problems of insufficient anti-slip and mechanical properties of existing car floor mat coils, as well as uneven material distribution caused by unreasonable flow channel structure during extrusion molding, a formula of an anti-slip car floor mat coil and a preparation method thereof are proposed.

[0005] The technical solution of the present invention is: a formula for an anti-slip car floor mat coil, which is composed of the following components in percentage by weight:

[0006] Base resin: 45%-65%;

[0007] Modified polyrotaxane: 3%-8%;

[0008] Anti-slip agent: 5%-10%;

[0009] Plasticizer: 8%-18%;

[0010] Stabilizer: 1%-4%;

[0011] Functional filler: 5%-12%;

[0012] Coupling agent: 0.5%-3%;

[0013] The modified polyrotaxane is composed of cyclodextrin-coated polyethylene glycol, and a sliding cross-linking structure is formed in the cyclic molecule, and the cross-linking density is , molecular weight 8000-15000;

[0014] The functional filler is a nanoscale magnesium aluminum silicate sheet layer with surface hydroxylation treatment, the sheet layer thickness ≤ 50 nm, and the aspect ratio ≥ 100:1.

[0015] Preferably, the base resin is a blend of styrene-butadiene-styrene block copolymer (SBS) and hydrogenated styrene-isoprene-styrene block copolymer (SEBS), the mass ratio of SBS / SEBS is 6:4 - 8:2, and the molecular weight of SBS is 120,000 - 180,000, and the hydrogenation degree of SEBS ≥ 95%.

[0016] Preferably, the anti-slip agent is a composite of carboxyl-terminated polydimethylsiloxane and nanodiamond micropowder, wherein the particle size of the nanodiamond micropowder is 20 - 50 nm, the surface is modified with γ-aminopropyltriethoxysilane, and the mass ratio of the two in the composite is 1:3 - 1:5.

[0017] Preferably, the plasticizer is a compound of triethyl citrate and neopentyl glycol adipate, the compounding ratio is 3:1 - 5:1, and the total addition amount of the plasticizer and the mass ratio of the base resin ≤ 0.3:1.

[0018] Preferably, the stabilizer is a compound of rare earth lanthanide compounds and hindered phenolic antioxidants, wherein the lanthanide compounds account for 40% - 60% of the total amount of the stabilizer, and the hindered phenolic antioxidant is pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0019] Preferably, the coupling agent is a compound of γ-mercaptopropyltrimethoxysilane and titanate coupling agent, the compounding mass ratio is 2:1 - 4:1, and the total addition amount of the coupling agent and the mass ratio of the functional filler is 1:20 - 1:30.

[0020] The present invention also provides a preparation method of an anti-slip automotive floor mat roll, which includes the anti-slip automotive floor mat roll formula as described above, and its preparation steps are as follows:

[0021] S1. Pretreatment stage:

[0022] The functional filler is vacuum dried at 120 - 140 °C for 4 - 6 hours under nitrogen protection;

[0023] The nanodiamond micropowder is subjected to oxygen plasma treatment, with a power of 100 - 150 W and a treatment time of 5 - 8 minutes;

[0024] S2. Pre-activation treatment:

[0025] The dried functional filler and the coupling agent are vigorously stirred at 80 - 100 °C for 30 - 60 minutes, and the stirring linear velocity is 12 - 18 m / s;

[0026] S3. Multi-stage mixing:

[0027] Primary mixing: Put the base resin, plasticizer, and stabilizer into a kneader and knead at 120 - 140 °C for 5 - 8 minutes;

[0028] Secondary mixing: Add the pre-activated functional filler and anti-slip agent, raise the temperature to 150 - 160 °C and knead for 3 - 5 minutes;

[0029] Tertiary mixing: Finally, add the modified polyrotaxane and knead at low speed at 100 - 120 °C for 2 - 3 minutes;

[0030] S4. Dynamic cross-linking extrusion:

[0031] Use a co-rotating twin-screw extruder for plasticizing extrusion. The screw is equipped with multiple sets of reverse-thread elements and pin kneading elements. The temperature gradients of each zone are set as follows: zone 1 at 135 °C, zone 2 at 155 °C, zone 3 at 170 °C, zone 4 at 165 °C, and the screw speed is 300 - 400 r / min;

[0032] S5. Microstructure forming:

[0033] Extrude through a multi-stage expansion-compression flow channel die head. The die head is set with:

[0034] Primary expansion cavity: The expansion angle is 30° - 45°, and the length-diameter ratio is 3:1;

[0035] Secondary compression cavity: The compression ratio is 2.5:1, and it is internally equipped with a honeycomb-shaped diverter;

[0036] Surface micro-etching section: An array of bionic gecko foot structures with an etching depth of 50 - 100 μm;

[0037] S6. Post-treatment curing:

[0038] Heat-treat the extruded coil at 80 - 100 °C for 10 - 15 minutes, and then perform surface cross-linking through an ultraviolet curing device.

[0039] Preferably, during the dynamic cross-linking extrusion process, the screw shear rate is controlled at , and at the same time, 0.2% - 0.5% benzoyl peroxide (BPO) is added as a cross-linking initiator through a side feeding port.

[0040] Preferably, an ultrasonic vibration device is set at the die head outlet during the microstructure forming, with a vibration frequency of 20 - 40 kHz and an amplitude of 5 - 10 μm to enhance the clarity of the surface bionic structure.

[0041] Preferably, after the post-treatment curing, a fluorosilane coating with a thickness of 1 - 3 μm is coated on the surface of the coil. The coating formula is:

[0042] Perfluorooctyltrimethoxysilane: 50% - 70%

[0043] Ethanol: 20%-30%

[0044] Deionized water: 5%-15%

[0045] Glacial acetic acid: 0.5%-1.5%.

[0046] Beneficial effects of the present invention:

[0047] 1. Based on the synergistic reinforcement of the dynamic sliding crosslinking of modified polyrotaxane and the nanosheet filler, the material exhibits a balanced rigidity and flexibility. The reversible slip mechanism of its molecular chains endows the coil with excellent tear resistance and deformation recovery. In the composite anti-slip system, the surface-modified nanodiamond powder enhances microscopic roughness through a mechanical interlocking effect, while the polar groups of the carboxyl-terminated polydimethylsiloxane enhance interfacial adhesion. The synergistic effect of the two enables the material to maintain a stable high coefficient of friction in both dry and wet environments, significantly improving the contact stability between the floor mat and the vehicle floor.

[0048] 2. Through the hydroxylation pretreatment of functional fillers combined with a multi-stage mixing process, the directional arrangement of nanosheets in the matrix is achieved. With the precise design of the multi-stage expansion and compression flow channel die, the melt undergoes a controllable shear and relaxation process in the flow channel, eliminating the flow mark defects caused by uneven dispersion of fillers in traditional extrusion processes. The ultrasonic vibration device micro-disturbs the melt at the die outlet, further optimizing the molding accuracy of the bionic microstructure, greatly improving the geometric fidelity of the surface micro-etching, and ensuring a high degree of consistency between the mechanical properties of the material and the surface functions. The anti-slip car floor mat coil formula and preparation method provided by the present invention, through the collaborative innovation of molecular design and process, effectively solve the problems of insufficient anti-slip and mechanical properties of existing car floor mat coils, as well as uneven material distribution caused by unreasonable flow channel structure during extrusion molding. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the embodiments.

[0050] Example 1: A formulation of an anti-slip car floor mat roll, comprising the following components in percentage by weight:

[0051] Base resin: 45%-65%;

[0052] Modified polyrotaxane: 3%-8%;

[0053] Anti-slip agent: 5%-10%;

[0054] Plasticizer: 8%-18%;

[0055] Stabilizer: 1%-4%;

[0056] Functional filler: 5%-12%;

[0057] Coupling agent: 0.5% - 3%;

[0058] Among them, the modified polyrotaxane is composed of cyclodextrin-coated polyethylene glycol, and a sliding cross-linked structure is formed inside its cyclic molecules, and the cross-linking density is , with a molecular weight of 8000 - 15000;

[0059] The functional filler is a nanoscale magnesium aluminum silicate sheet layer with surface hydroxylation treatment, the sheet layer thickness ≤ 50 nm, and the aspect ratio ≥ 100:1.

[0060] Preferably, the base resin is a blend of styrene-butadiene-styrene block copolymer (SBS) and hydrogenated styrene-isoprene-styrene block copolymer (SEBS), the mass ratio of SBS / SEBS is 6:4 - 8:2, and the molecular weight of SBS is 120,000 - 180,000, and the hydrogenation degree of SEBS ≥ 95%.

[0061] Preferably, the anti-slip agent is a composite of carboxyl-terminated polydimethylsiloxane and nanodiamond micropowder, wherein the particle size of the nanodiamond micropowder is 20 - 50 nm, the surface is modified with γ-aminopropyltriethoxysilane, and the mass ratio of the two in the composite is 1:3 - 1:5.

[0062] Preferably, the plasticizer is a compound of triethyl citrate and neopentyl glycol adipate, and the compounding ratio is 3:1 - 5:1, and the total addition amount of the plasticizer and the mass ratio of the base resin ≤ 0.3:1.

[0063] Preferably, the stabilizer is a compound of rare earth lanthanide compounds and hindered phenol antioxidants, wherein the lanthanide compounds account for 40% - 60% of the total stabilizer amount, and the hindered phenol antioxidant is pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0064] Preferably, the coupling agent is a compound of γ-mercaptopropyltrimethoxysilane and titanate coupling agent, and the compounding mass ratio is 2:1 - 4:1, and the total addition amount of the coupling agent and the mass ratio of the functional filler is 1:20 - 1:30.

[0065] The present invention also provides a preparation method of an anti-slip automotive floor mat roll, which includes the anti-slip automotive floor mat roll formula as described above, and its preparation steps are as follows:

[0066] S1. Pretreatment stage:

[0067] Vacuum dry the functional filler at 120 - 140 °C for 4 - 6 hours under nitrogen protection;

[0068] Perform oxygen plasma treatment on the nanodiamond micropowder, with a power of 100 - 150 W and a treatment time of 5 - 8 minutes;

[0069] S2. Pre-activation treatment:

[0070] Mix the dried functional filler and the coupling agent at 80 - 100 °C with high-speed stirring for 30 - 60 minutes, and the stirring linear speed is 12 - 18 m / s;

[0071] S3. Multi-stage mixing:

[0072] First-stage mixing: Put the base resin, plasticizer, and stabilizer into the internal mixer and mix at 120 - 140 °C for 5 - 8 minutes;

[0073] Second-stage mixing: Add the pre-activated functional filler and the anti-slip agent, and raise the temperature to 150 - 160 °C and mix for 3 - 5 minutes;

[0074] Third-stage mixing: Finally, add the modified polyrotaxane and mix at 100 - 120 °C with low-speed stirring for 2 - 3 minutes;

[0075] S4. Dynamic cross-linking extrusion:

[0076] Use a co-rotating twin-screw extruder for plasticizing extrusion. The screw is equipped with multiple sets of reverse-thread elements and pin mixing elements. The temperature gradient of each zone is set as: Zone 1 at 135 °C, Zone 2 at 155 °C, Zone 3 at 170 °C, Zone 4 at 165 °C, and the screw speed is 300 - 400 r / min;

[0077] S5. Microstructure forming:

[0078] Extrude through a multi-stage expansion-compression die head. Inside the die head, there are:

[0079] First-stage expansion cavity: The expansion angle is 30° - 45°, and the length-diameter ratio is 3:1;

[0080] Second-stage compression cavity: The compression ratio is 2.5:1, and it is equipped with a honeycomb-shaped diverter inside;

[0081] Surface micro-etching section: An array of biomimetic gecko foot sole structures with an etching depth of 50 - 100 μm;

[0082] S6. Post-treatment curing:

[0083] Heat-treat the extruded coil at 80 - 100 °C for 10 - 15 minutes, and then carry out surface cross-linking through an ultraviolet curing device.

[0084] Preferably, during the dynamic cross-linking extrusion process, the screw shear rate is controlled at , and at the same time, 0.2% - 0.5% benzoyl peroxide (BPO) is added as a cross-linking initiator through the side feeding port.

[0085] Preferably, an ultrasonic vibration device is set at the die head outlet during the microstructure forming, with a vibration frequency of 20 - 40 kHz and an amplitude of 5 - 10 μm to enhance the clarity of the surface biomimetic structure.

[0086] Preferably, after post-treatment curing, a fluorosilane coating with a thickness of 1-3 μm is coated on the surface of the coil. The coating formula is as follows:

[0087] Perfluorooctyltrimethoxysilane: 50%-70%

[0088] Ethanol: 20%-30%

[0089] Deionized water: 5%-15%

[0090] Glacial acetic acid: 0.5%-1.5%.

[0091] Example 2: The present application provides a technical solution, which is different from that of Example 1 in that the anti-slip automotive foot mat coil formula consists of the following components in weight percentages:

[0092] Base resin: 50%-60%;

[0093] Modified polyrotaxane: 4%-6%;

[0094] Anti-slip agent: 6%-8%;

[0095] Plasticizer: 10%-15%;

[0096] Stabilizer: 2%-3%;

[0097] Functional filler: 8%-10%;

[0098] Coupling agent: 1%-2%;

[0099] Among them, the modified polyrotaxane is composed of β-cyclodextrin-coated polypropylene glycol, and the crosslinking density is , with a molecular weight of 10,000-12,000;

[0100] The functional filler is a nano-scale magnesium aluminum silicate sheet layer with surface amination treatment, the sheet layer thickness ≤ 30 nm, and the aspect ratio ≥ 150:1.

[0101] Preferably, the base resin is a blend of hydrogenated styrene-butadiene-styrene block copolymer (SEBS) and thermoplastic polyurethane (TPU), the SEBS / TPU mass ratio is 7:3, the SEBS hydrogenation degree ≥ 98%, and the TPU Shore hardness is 85A-90A;

[0102] Preferably, the anti-slip agent is a composite of epoxy-terminated polydimethylsiloxane and nano boron nitride micropowder, the nano boron nitride particle size is 10-30 nm, the surface is modified with γ-glycidoxypropyltrimethoxysilane, and the composite mass ratio is 1:4;

[0103] Preferably, the plasticizer is a compound of tributyl acetylcitrate and polypropylene glycol sebacate, with a compounding ratio of 4:1, and the total addition amount is ≤0.25:1 based on the mass ratio of the substrate resin;

[0104] Preferably, the stabilizer is a compound of cerium zirconium composite oxide and dilauryl thiodipropionate, and the cerium zirconium composite accounts for 55%;

[0105] Preferably, the coupling agent is a compound of γ-methacryloxypropyltrimethoxysilane and aluminate coupling agent, with a mass ratio of 3:1.

[0106] The present invention also provides a preparation method of the anti-slip automotive floor mat roll, which includes the anti-slip automotive floor mat roll formula as described above, and the preparation steps are as follows:

[0107] S1. Pretreatment stage:

[0108] The functional filler is vacuum dried at 130°C for 5 hours under argon protection;

[0109] The nano boron nitride micropowder is subjected to nitrogen plasma treatment with a power of 120W and a treatment time of 6 minutes;

[0110] S2. Pre-activation treatment:

[0111] The functional filler and the coupling agent are stirred at high speed at 90°C for 40 minutes, and the stirring linear speed is 15m / s;

[0112] S3. Multi-stage mixing:

[0113] First-stage mixing: The substrate resin, plasticizer, and stabilizer are kneaded at 130°C for 6 minutes;

[0114] Second-stage mixing: Add the pre-activated functional filler and the anti-slip agent, and knead at 155°C for 4 minutes;

[0115] Third-stage mixing: Add the modified polyrotaxane and knead at low speed at 110°C for 2.5 minutes;

[0116] S4. Dynamic cross-linking extrusion:

[0117] The temperatures of each zone of the twin-screw extruder are: zone 1 at 140°C, zone 2 at 160°C, zone 3 at 175°C, zone 4 at 170°C, and the screw rotation speed is 350r / min;

[0118] The screw shear rate is controlled at , and 0.3% dicumyl peroxide (DCP) is added at the side feeding port;

[0119] S5. Microstructure forming:

[0120] The expansion angle of the first-stage expansion cavity of the die head is 40°, and a spiral diverter is arranged in the second-stage compression cavity;

[0121] The etching depth of the surface micro-etching pattern segment is 60 - 80 μm, and the sharkskin scale structure is imitated;

[0122] Ultrasonic vibration with a frequency of 30 kHz and an amplitude of 8 μm is applied at the die exit;

[0123] S6. Post-treatment curing:

[0124] The coil material is heat-treated at 90 °C for 12 minutes, and the ultraviolet curing energy density is 300 mJ / cm²;

[0125] The surface is coated with a fluorosilane coating, the coating thickness is 2 μm, and the proportion of perfluorooctyltrimethoxysilane is 60%.

[0126] Example 3: The present application provides a technical solution, which is different from that of Example 1 in that: the anti-slip automotive floor mat coil material formula is composed of the following components in weight percentages:

[0127] Base resin: 55% - 65%;

[0128] Modified polyrotaxane: 5% - 7%;

[0129] Anti-slip agent: 7% - 9%;

[0130] Plasticizer: 12% - 16%;

[0131] Stabilizer: 1.5% - 2.5%;

[0132] Functional filler: 6% - 8%;

[0133] Coupling agent: 0.8% - 1.5%;

[0134] Among them, the modified polyrotaxane is composed of γ-cyclodextrin-coated polytetrahydrofuran, and the crosslinking density is , and the molecular weight is 12,000 - 15,000;

[0135] The functional filler is nano-scale montmorillonite platelet with surface sulfonic acid group treatment, the platelet thickness ≤ 20 nm, and the aspect ratio ≥ 200:1.

[0136] Preferably, the base resin is a blend of styrene-ethylene-butene-styrene block copolymer (SEBS) and polyolefin elastomer (POE), the SEBS / POE mass ratio is 8:2, and the density of POE is 0.88 g / cm³;

[0137] Preferably, the anti-slip agent is a composite of amino-terminated polydimethylsiloxane and nano-scale silicon carbide micropowder, the particle size of nano-scale silicon carbide is 15 - 40 nm, the surface is modified by dopamine, and the composite mass ratio is 1:5;

[0138] Preferably, the plasticizer is a compound of epoxidized soybean oil and polyethylene glycol sebacate, and the compounding ratio is 2:1, and the total addition amount is ≤ 0.2:1 based on the mass of the base resin;

[0139] Preferably, the stabilizer is a compound of neodymium compound and triphenyl phosphite, and the proportion of the neodymium compound is 50%;

[0140] Preferably, the coupling agent is a compound of vinyltriethoxysilane and zirconium aluminate coupling agent, and the mass ratio is 5:1.

[0141] The present invention also provides a preparation method of a non-slip automotive floor mat roll, which includes the non-slip automotive floor mat roll formula as described above, and the preparation steps are as follows:

[0142] S1. Pretreatment stage:

[0143] The functional filler is dried in a vacuum drying oven at 125 °C for 4.5 hours;

[0144] The nano silicon carbide micropowder is treated by argon plasma, with a power of 140 W and a treatment time of 7 minutes;

[0145] S2. Pre-activation treatment:

[0146] The functional filler and the coupling agent are stirred at high speed at 85 °C for 50 minutes, and the stirring linear speed is 16 m / s;

[0147] S3. Multi-stage mixing:

[0148] First-stage mixing: The base resin, plasticizer, and stabilizer are kneaded at 135 °C for 7 minutes;

[0149] Second-stage mixing: Add the pre-activated functional filler and the anti-slip agent, and knead at 158 °C for 3.5 minutes;

[0150] Third-stage mixing: Add the modified polyrotaxane, and knead at low speed at 115 °C for 3 minutes;

[0151] S4. Dynamic cross-linking extrusion:

[0152] The temperatures of each zone of the twin-screw extruder are: zone 1 at 145 °C, zone 2 at 165 °C, zone 3 at 180 °C, zone 4 at 175 °C, and the screw rotation speed is 380 r / min;

[0153] The screw shear rate is controlled at , and 0.4% dicumyl peroxide (DCP) is added at the side feeding port;

[0154] S5. Microstructure forming:

[0155] The expansion angle of the first-stage expansion cavity of the die head is 35°, and a star-shaped diverter is arranged in the second-stage compression cavity;

[0156] The etching depth of the surface micro-etching pattern segment is 70-90 μm, and the microstructure of the beetle elytra is imitated;

[0157] Ultrasonic vibration with a frequency of 25 kHz and an amplitude of 6 μm is applied at the die head outlet;

[0158] S6. Post-treatment curing:

[0159] The coil is heat-treated at 95 °C for 14 minutes, and the ultraviolet curing energy density is 400 mJ / cm²;

[0160] The surface is coated with a fluorosilane coating with a thickness of 1.5 μm, and the perfluorodecyltriethoxysilane accounts for 65%.

[0161] Performance test: In order to test the performance of the prepared automotive floor mat coil, the automotive floor mat coils prepared under the ratios in the examples and comparative examples are now tested. The experiment is divided into four groups, namely Experiment 1, Experiment 2, Experiment 3, and Experiment 4, corresponding to Example 1, Example 2, Example 3, and the comparative example in sequence. The experimental results are as follows:

[0162] Project sample Skid resistance (friction coefficient) Compressive strength (MPa) Ultraviolet absorption rate (%) Example 1 0.88 28 92 Example 2 0.85 32 89 Example 3 0.82 35 94 Comparative example 0.75 22 78

[0163] It can be known from the above experiments that:

[0164] The anti-slip performance of Example 1 is the best. Thanks to the synergistic effect of carboxyl-terminated polydimethylsiloxane and nano-diamond micropowder, its high surface roughness and polar groups significantly improve the friction coefficient.

[0165] Examples 2 and 3 are slightly lower due to different anti-slip agent types (boron nitride / silicon carbide), but they are still better than the comparative example.

[0166] The compressive capacity of Example 3 is the best. The synergistic strengthening effect of its SEBS / POE substrate system and montmorillonite filler with a high aspect ratio significantly improves the compressive strength. Example 2 is second due to the rigid support of TPU, and Example 1 (28 MPa) is slightly weaker due to the flexible characteristics of SBS / SEBS.

[0167] The ultraviolet absorption rate of Example 3 is the highest. The compound stabilizer of neodymium-based compound and triphenyl phosphite has the best absorption and scattering effects on ultraviolet rays. Examples 1 and 2 are slightly lower due to the difference in the stabilizer system, but they are still much better than the comparative example.

[0168] Example 3 leads in two key indicators of compressive capacity (35 MPa) and ultraviolet absorption rate (94%), and is suitable for harsh environments (such as engineering vehicles) with long-term exposure to high-intensity pressure and ultraviolet irradiation.

Claims

1. Anti-slip automotive floor mat roll formula, characterized in that: Composed of the following components by weight percentage: Base resin: 45% - 65%; Modified polyrotaxane: 3% - 8%; Anti-slip agent: 5% - 10%; Plasticizer: 8% - 18%; Stabilizer: 1% - 4%; Functional filler: 5% - 12%; Coupling agent: 0.5% - 3%; Among them, the modified polyrotaxane is composed of cyclodextrin-coated polyethylene glycol, and a sliding cross-linked structure is formed within its cyclic molecules, and the cross-linking density is , and the molecular weight is 8000-15000; The functional filler is a nanoscale magnesium aluminum silicate sheet with surface hydroxylation treatment, the sheet thickness ≤ 50nm, and the aspect ratio ≥ 100:

1.

2. The anti-slip automotive floor mat roll material formulation according to claim 1, characterized in that: The base resin is a blend of styrene-butadiene-styrene block copolymer (SBS) and hydrogenated styrene-isoprene-styrene block copolymer (SEBS), the mass ratio of SBS / SEBS is 6:4 - 8:2, and the molecular weight of SBS is 120,000 - 180,000, and the hydrogenation degree of SEBS ≥ 95%.

3. The anti-slip automotive floor mat roll material formulation according to claim 1, characterized in that: The anti-slip agent is a composite of carboxyl-terminated polydimethylsiloxane and nanodiamond micropowder, where the particle size of the nanodiamond micropowder is 20 - 50nm, the surface is modified with γ-aminopropyltriethoxysilane, and the mass ratio of the two in the composite is 1:3 - 1:

5.

4. The anti-slip automotive floor mat roll material formulation according to claim 1, characterized in that: The plasticizer is a compound of triethyl citrate and neopentyl glycol adipate, the compounding ratio is 3:1 - 5:1, and the total addition amount of the plasticizer to the mass ratio of the base resin ≤ 0.3:

1.

5. The anti-slip automotive floor mat roll material formulation according to claim 1, characterized in that: The stabilizer is a compound of rare earth lanthanide compounds and hindered phenolic antioxidants, where the lanthanide compounds account for 40% - 60% of the total stabilizer, and the hindered phenolic antioxidant is pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

6. The anti-slip automotive floor mat roll material formulation according to claim 1, characterized in that: The coupling agent is a compound of γ-mercaptopropyltrimethoxysilane and titanate coupling agent, the compounding mass ratio is 2:1 - 4:1, and the total addition amount of the coupling agent to the mass ratio of the functional filler is 1:20 - 1:

30.

7. Preparation method of the anti-slip automotive foot mat roll, which includes the anti-slip automotive foot mat roll formula as described in claims 1 - 6, and its preparation steps are as follows: S1. Pretreatment stage: Vacuum dry the functional filler at 120 - 140°C for 4 - 6 hours under nitrogen protection; Perform oxygen plasma treatment on the nanodiamond micropowder, with a power of 100 - 150W and a treatment time of 5 - 8 minutes; S2. Pre-activation treatment: High-speed stir the dried functional filler and the coupling agent at 80 - 100°C for 30 - 60 minutes, with a stirring linear speed of 12 - 18m / s; S3. Multi-stage mixing: First-stage mixing: Put the base resin, plasticizer, and stabilizer into an internal mixer and mix at 120 - 140°C for 5 - 8 minutes; Second-stage mixing: Add the pre-activated functional filler and the anti-slip agent, raise the temperature to 150 - 160°C and mix for 3 - 5 minutes; Third-stage mixing: Finally, add the modified polyrotaxane and mix at 100 - 120°C for 2 - 3 minutes at low speed; S4. Dynamic cross-linking extrusion: Use a co-rotating twin-screw extruder for plasticizing extrusion, the screw is equipped with multiple sets of reverse-thread elements and pin mixing elements, and the temperature gradients of each zone are set as follows: zone 1 at 135°C, zone 2 at 155°C, zone 3 at 170°C, zone 4 at 165°C, and the screw speed is 300 - 400r / min; S5. Microstructure forming: Extrude through a multi-stage expansion-compression die head, and set inside the die head: Primary expansion chamber: expansion angle 30° - 45°, major axis ratio 3:1; Secondary compression chamber: compression ratio 2.5:1, with a honeycomb-shaped diverter inside; Surface micro-etching section: an array of biomimetic gecko foot structures with an etching depth of 50 - 100 μm; S6. Post-treatment curing: Heat-treat the extruded coil at 80 - 100 °C for 10 - 15 minutes, and then perform surface cross-linking through an ultraviolet curing device.

8. The preparation method of the anti-slip automotive floor mat coil according to claim 7, characterized in that: During the dynamic cross-linking extrusion process, the screw shear rate is controlled at , and 0.2%-0.5% benzoyl peroxide (BPO) is added as a cross-linking initiator through the side feeding port.

9. The preparation method of the anti-slip automotive floor mat roll according to claim 7, wherein: An ultrasonic vibration device is set at the outlet of the micro-structure forming die head, with a vibration frequency of 20 - 40 kHz and an amplitude of 5 - 10 μm to enhance the clarity of the surface biomimetic structure.

10. The preparation method of the anti-slip automotive floor mat roll according to claim 7, characterized in that: After the post-treatment curing, a fluorosilane coating with a thickness of 1 - 3 μm is coated on the surface of the coil, and the coating formula is: Perfluorooctyltrimethoxysilane: 50% - 70% Ethanol: 20% - 30% Deionized water: 5% - 15% Glacial acetic acid: 0.5% - 1.5%.