Tire cloth liner with high-temperature-resistant coating and preparation method of tire cloth liner

Abstract

The invention relates to the technical field of production of cloth liners, in particular to a tire cloth liner with a high-temperature-resistant coating and a preparation method of the tire cloth liner. According to the invention, the problems of poor anti-sticking property and poor durability of the existing tire mat cloth are solved. The cloth liner comprises a base body layer, a hard layer, a high-temperature-resistant layer and an anti-sticking layer, the base body layer is coated and cured with hard layer mixed slurry, then the high-temperature-resistant layer is hot-pressed on the hard layer through a high-strength adhesive, then anti-sticking layer slurry is sprayed on the high-temperature-resistant layer, and the tire cloth liner is obtained after curing and cooling. Carbon fiber reinforced epoxy resin is added into the hard layer, and the carbon fiber reinforced epoxy resin, silicon carbide and boron nitride can synergistically improve the mechanical property of the cloth liner; the high-temperature-resistant layer and the hard layer are bonded through the high-strength adhesive, so that the bonding force between the layers is improved; modified graphene oxide and a composite coupling agent are added into the high-temperature-resistant layer, so that the high-temperature-resistant performance of the cloth liner is jointly improved; silane modified organic silicon is added into the anti-sticking layer, so that the anti-sticking performance of the cloth liner can be improved together with other components.

Description

Technical Field

[0001] The invention relates to the technical field of tire mat production, in particular to a tire mat with a high temperature resistant coating and a preparation method thereof. Background Art

[0002] With the rise and vigorous development of the automobile industry, people have higher and higher requirements for the quality of rubber tires. In the tire manufacturing process, pads are a key auxiliary material, mainly used to divide the rubber material into rolls and to preserve the unvulcanized rubber or the rubber-coated cord to ensure that the rubber surface remains fresh and avoid dust pollution. Pads are usually divided into two categories: fabric type and film type. Fabric pads include cotton pads, polypropylene pads, vinylon pads and polyester pads, etc. However, in the existing technology, these pads generally have poor anti-sticking properties and insufficient tensile strength. Problems such as these make it difficult to meet the high standards of modern tire production. This not only affects tire production efficiency and product quality, but also increases production costs and resource waste.

[0003] During the tire production process, the padding plays a vital role in alleviating the compression deformation of the sidewall rubber surface. However, the existing padding not only has poor anti-sticking properties and insufficient tensile strength, but also cannot effectively alleviate the compression deformation of the sidewall rubber surface, which limits its application in tire production. At the same time, the padding needs to be used repeatedly during the tire production process, which requires the padding to not only have good anti-sticking and tensile properties, but also have high heat resistance and stability to ensure that it can maintain its functionality under high temperature and high pressure environments. Existing padding materials are obviously insufficient and cannot fully meet the high performance and durability requirements for padding in modern tire production processes.

[0004] In summary, in order to solve the problems of poor anti-stickiness and poor durability of current tire pads, it is urgent to develop a new type of high-performance pad material, which can not only improve production efficiency and reduce production costs, but also significantly improve the quality and performance of tire products, and further promote the development of the automotive industry.

[0005] Therefore, a tire mat with a high temperature resistant coating and a preparation method thereof are proposed. Summary of the invention

[0006] The purpose of the present invention is to design a tire mat with a high-temperature resistant coating and a preparation method thereof. The present invention includes a base layer, a hard layer, a high-temperature resistant layer and an anti-sticking layer. The hard layer mixed slurry is coated and cured on the base layer, and then the high-temperature resistant layer is hot-pressed on the hard layer through a high-strength adhesive, and then the anti-sticking layer slurry is sprayed on the high-temperature resistant layer. After curing and cooling, the tire mat is obtained; adding carbon fiber reinforced epoxy resin to the hard layer can synergistically improve the mechanical properties of the mat with silicon carbide and boron nitride; bonding the high-temperature resistant layer to the hard layer through a high-strength adhesive improves the bonding force between the layers; adding modified graphene oxide and a composite coupling agent to the high-temperature resistant layer can synergistically improve the high-temperature resistance of the mat; adding silane-modified silicone to the anti-sticking layer can improve the anti-sticking performance of the mat together with the other components.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] On one hand, the present invention provides a tire mat with a high temperature resistant coating, the tire mat comprising a base layer, a hard layer, a high temperature resistant layer and an anti-sticking layer, the hard layer and the high temperature resistant layer are bonded by a high strength adhesive;

[0009] The base layer includes vinylon fiber pad cloth and foam;

[0010] The hard layer includes carbon fiber reinforced epoxy, silicon carbide and boron nitride;

[0011] The high temperature resistant layer comprises a polyimide film, modified graphene oxide and a composite coupling agent; the modified graphene oxide comprises graphene oxide and γ-glycidyloxypropyltrimethoxysilane;

[0012] The anti-sticking layer includes silane-modified silicone, polytetrafluoroethylene micropowder and molybdenum disulfide nanosheets;

[0013] The high-strength adhesive comprises modified epoxy resin, carbon nanotubes and aluminum borate whiskers; the modified epoxy resin comprises epoxy resin E-51 and polyurethane prepolymer.

[0014] Preferably, the foam is silicone foam.

[0015] Preferably, the composite coupling agent comprises γ-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane, and the weight ratio of γ-aminopropyltriethoxysilane to γ-glycidyloxypropyltrimethoxysilane is 2-5:1.

[0016] Another aspect of the present invention provides a method for preparing a tire mat having a high temperature resistant coating, the method comprising the following steps:

[0017] S1 sandwiches the foam between two layers of vinylon fiber pads and obtains the base layer by hot pressing. The temperature of hot pressing is 160℃, the pressure is 1MPa, and the time is 15min.

[0018] S2: Coat the hard layer mixed slurry on one side of the base layer, first heat it at 80℃ for 2h for pre-gelling, then cure it at 150℃ for 4h, and finally compact it with a pressure roller at 60℃ for 5min to obtain a hard layer with a thickness of 0.3mm-0.5mm;

[0019] S3: Coat high-strength adhesive on the hard layer, let it stand for 5 minutes, and then hot-press the high-temperature resistant layer. The hot-pressing temperature is 220℃-270℃, the pressure is 2.5MPa, and the time is 20min.

[0020] S4 sprays the anti-sticking layer slurry on the high temperature resistant layer with high pressure and airless spraying. The nozzle diameter of the spraying is 0.5mm, the pressure is 15MPa, the spraying thickness is 60μm-80μm, and it is heated at 100℃ for 10min, then heated to 200℃ and heated for another 8min. Finally, it is compacted with a pressure roller to obtain the anti-sticking layer. The pressure of the pressure roller is 0.3MPa and the temperature is 80℃. Finally, the semi-finished pad is obtained by hot pressing for 20min as a whole. The temperature of the hot pressing is 230℃ and the pressure is 2.5MPa.

[0021] S5 cools the semi-finished mat and then rolls it up and packs it to obtain the tire mat.

[0022] Preferably, the preparation method of the hard layer mixed slurry in S2 is as follows, by weight: 95-105 parts of carbon fiber reinforced epoxy resin, 25 parts of silicon carbide and 12 parts of boron nitride are added to a stirring container in sequence, and stirred at 800 rpm for 15 minutes to obtain a slurry; ethanol is added to the slurry to adjust the viscosity to 1000 mPa·s-1300 mPa·s, and then degassing is carried out at -0.095 MPa for 10 minutes to obtain a hard layer mixed slurry.

[0023] Preferably, in parts by weight, the preparation method of the carbon fiber reinforced epoxy resin is as follows: 20 parts of methyltetrahydrophthalic anhydride are slowly added to 60 parts of epoxy resin E-51, and stirred evenly at a stirring speed of 300rpm-500rpm for 15min to obtain a mixture A; 3 parts of 2,4,6-tris(dimethylaminomethyl)phenol are added to the mixture A, and stirring is continued for 10min to obtain a mixture B; 35-45 parts of chopped carbon fibers are placed in the mixture B by a vacuum impregnation method, the vacuum degree of vacuum impregnation is -0.1MPa, and the impregnation time is 1.5h to obtain impregnated carbon fibers; the impregnated carbon fibers are placed in a mold, first pre-pressed at 0.8MPa for 10min, and then the pressure is gradually increased to 3MPa, and cured at 130°C for 3h to obtain a cured product; the cured product is cooled and demolded to obtain a carbon fiber reinforced epoxy resin.

[0024] Preferably, in parts by weight, the preparation method of the high-strength adhesive in S3 is: 100 parts of modified epoxy resin, 1-3 parts of carbon nanotubes and 5-10 parts of aluminum borate whiskers are added to a stirring container in sequence, the rotation speed is 1500 rpm, and the stirring time is 25 minutes to obtain a mixture; 0.5 parts of BYK-066N are added to the mixture, stirred for 30 minutes to remove bubbles, and the mixed adhesive is allowed to stand for 30 minutes to obtain a high-strength adhesive.

[0025] Preferably, the preparation method of the modified epoxy resin is as follows, by weight: 100 parts of epoxy resin E-51 are heated to 50° C., 10-20 parts of polyurethane prepolymer are slowly added to the epoxy resin E-51, stirred for 40 minutes, 30 parts of diaminodiphenyl sulfone are added, stirring is continued for 10 minutes to 15 minutes, and degassing is performed at -0.095 MPa for 10 minutes to obtain the modified epoxy resin.

[0026] Preferably, in parts by weight, the preparation method of the high temperature resistant layer in S3 is: add 20-30 parts of modified graphene oxide and 2 parts of a composite coupling agent to 20 parts of N-methylpyrrolidone, stir for 15 minutes, and obtain a mixed slurry; evenly coat the mixed slurry on the surface of the polyimide film with a thickness controlled at 10 μm-50 μm; pre-dry the polyimide film at 80°C for 15 minutes, and then cure it at 150°C-200°C for 1.5 hours to obtain a high temperature resistant layer.

[0027] Preferably, in parts by weight, the preparation method of modified graphene oxide is: drying 80-90 parts of graphene oxide at 80° C. for 2 hours to obtain pretreated graphene oxide; dissolving 10 parts of γ-glycidyloxypropyltrimethoxysilane in 100 parts of ethanol to obtain a mixed solution; adding the pretreated graphene oxide to the mixed solution, stirring for 30 min-60 min, adding 0.5 parts of polyethylene glycol, continuing to stir for 3 hours, centrifuging the solid product, washing it, and vacuum drying it at 80° C. for 12 hours to obtain modified graphene oxide.

[0028] Preferably, in parts by weight, the preparation method of the anti-sticking layer slurry in S4 is: 90-100 parts of silane-modified silicone, 8 parts of polytetrafluoroethylene powder and 2 parts of molybdenum disulfide nanosheets are added to a stirring container in sequence, and stirred at 1100 rpm for 25 minutes to obtain a slurry; ethanol is added to the slurry to adjust the viscosity to 1200 mPa·s-1500 mPa·s, and then 0.5 parts of BYK-066N are added, stirred for 30 minutes to remove bubbles, and the anti-sticking layer slurry is obtained after standing for 30 minutes.

[0029] Preferably, the preparation method of silane-modified silicone is as follows, by weight: dissolving 50-60 parts of methyltrimethoxysilane in 60 parts of ethanol, stirring until completely dissolved to obtain a mixed solution; slowly adding 1-5 parts of γ-aminopropyltriethoxysilane to the mixed solution, stirring for 40 minutes, adding 0.2 parts of dibutyltin dilaurate, and continuing to stir for 15 minutes to obtain a mixture; removing ethanol from the mixture by reduced pressure distillation to obtain silane-modified silicone.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention adds carbon fiber reinforced epoxy resin to the hard layer, which can synergistically improve the mechanical properties of the pad cloth with silicon carbide and boron nitride. In the process of synthesizing carbon fiber reinforced epoxy resin, a carbonyl group of the acid anhydride reacts with the epoxy group to generate an ester bond and a carboxyl group. The newly generated carboxyl group can react with another epoxy group to form an ether bond and an ester bond, and finally form a three-dimensional network structure of the body polymer. This cross-linked structure gives it good mechanical properties. Epoxy resin acts as a bonding matrix to tightly combine carbon fiber, silicon carbide and boron nitride to form a uniform composite material system. In this system, the components can work better together through interface interactions, thereby improving its durability.

[0032] 2. The present invention bonds the high temperature resistant layer to the hard layer through a high-strength adhesive, thereby improving the bonding force between the layers. During the synthesis of the modified epoxy resin, the active groups in the polyurethane prepolymer will chemically react with the hydroxyl groups in the epoxy resin to form a chemical bond connection; at the same time, the long chain structure of the polyurethane prepolymer can play a toughening role in the network structure of the epoxy resin and improve its mechanical properties. The modified epoxy resin provides basic bonding and curing properties, the carbon nanotubes enhance the strength and toughness of the adhesive, and the aluminum borate whiskers increase the hardness; the combination of the three enables the high-strength adhesive to better withstand various external forces, thereby improving its durability.

[0033] 3. The present invention adds modified graphene oxide and a composite coupling agent to the high temperature resistant layer, which can synergistically improve the high temperature resistance of the mat. In the modification process of graphene oxide, the silanol groups produced by the hydrolysis of the silane coupling agent will undergo a condensation reaction with the hydroxyl groups on the surface of the graphene oxide to form a stable silicon-oxygen bond, so that the silane coupling agent is chemically bonded to the surface of the graphene oxide, thereby improving the performance of the graphene oxide. The polyimide film provides the high temperature resistance of the main body, and the modified graphene oxide acts as a heat insulation barrier to reduce heat transfer. The two work together to enable the mat to withstand higher temperatures; the composite coupling agent ensures that the polyimide film and the modified graphene oxide are firmly bonded to the matrix material at high temperatures by enhancing the interface bonding and improving the compatibility, thereby ensuring the stability of the entire high temperature resistant layer structure, thereby synergistically improving the high temperature resistance of the mat and improving the durability of the mat.

[0034] 4. The present invention adds silane-modified silicone to the anti-sticking layer, which can improve the anti-sticking performance of the mat together with polytetrafluoroethylene micropowder and molybdenum disulfide nanosheets. In the preparation process of silane-modified silicone, a polycondensation reaction will occur between the silanol groups produced by the hydrolysis of the two silanes to form a silicon-oxygen bond, thereby connecting γ-aminopropyltriethoxysilane to the molecular chain of the hydrolysis product of methyltrimethoxysilane, thereby achieving the modified combination of the two silanes. The synergistic effect of the three makes the surface of the mat have both low surface energy and smooth surface and self-lubricating properties, which comprehensively improves the anti-sticking performance of the mat from multiple aspects, so that it can effectively prevent the adhesion of various substances, and also has good wear resistance and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a layered structure diagram of the tire padding of the present invention.

[0036] In the figure: 1. Anti-sticking layer; 2. High temperature resistant layer; 3. Hard layer; 4. Base layer. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0038] Invention substance information:

[0039] Silicone foam was purchased from Wuxi Smeida Technology Co., Ltd.; polyimide film was purchased from Xuchang Eric Insulation Products Co., Ltd.; polyurethane prepolymer: CAS No.: 103837-45-2; molybdenum disulfide nanosheets were purchased from Jiangsu Xianfeng Nanomaterial Technology Co., Ltd.; carbon nanotubes: CAS No.: 16291-96-6; graphene oxide: CAS No.: 7782-42-5; aluminum borate whiskers were purchased from Hubei Xinyuhong Biomedical Technology Co., Ltd.; chopped carbon fiber was purchased from Yancheng Xiangsheng Carbon Fiber Technology Co., Ltd.; BYK-066N was purchased from BYK.

[0040] like Figure 1 As shown, the tire mat of the present invention comprises an anti-sticking layer, a high temperature resistant layer, a hard layer and a base layer from top to bottom, and the high temperature resistant layer and the hard layer are bonded by a high-strength adhesive.

[0041] Specific reference Figure 1 The present invention provides a tire mat with a high temperature resistant coating and a preparation method thereof, and the technical scheme is as follows:

[0042] Example 1

[0043] Heat 100 parts of epoxy resin E-51 to 50°C, slowly add 10 parts of polyurethane prepolymer into epoxy resin E-51, stir for 40 minutes, add 30 parts of diaminodiphenyl sulfone, continue stirring for 10 minutes, degas at -0.095 MPa for 10 minutes to obtain modified epoxy resin.

[0044] 100 parts of modified epoxy resin, 1 part of carbon nanotubes and 5 parts of aluminum borate whiskers were added to a stirring container in sequence at a rotation speed of 1500 rpm for 25 minutes to obtain a mixture; 0.5 parts of BYK-066N were added to the mixture, stirred for 30 minutes to remove bubbles, and the mixed adhesive was allowed to stand for 30 minutes to obtain a high-strength adhesive.

[0045] Slowly add 20 parts of methyltetrahydrophthalic anhydride to 60 parts of epoxy resin E-51, stir evenly at a stirring speed of 300 rpm, and the stirring time is 15 minutes to obtain a mixture A; add 3 parts of 2,4,6-tris(dimethylaminomethyl)phenol to the mixture A, and continue stirring for 10 minutes to obtain a mixture B; use a vacuum impregnation method to put 35 parts of chopped carbon fibers into the mixture B, the vacuum degree of vacuum impregnation is -0.1MPa, the impregnation time is 1.5h, and impregnated carbon fibers are obtained; put the impregnated carbon fibers into a mold, first pre-press at 0.8MPa for 10 minutes, then gradually increase the pressure to 3MPa, and cure at 130°C for 3h to obtain a cured product; cool the cured product and demold it to obtain a carbon fiber reinforced epoxy resin.

[0046] 80 parts of graphene oxide were dried at 80°C for 2 hours to obtain pretreated graphene oxide; 10 parts of γ-glycidyloxypropyltrimethoxysilane were dissolved in 100 parts of ethanol to obtain a mixed solution; the pretreated graphene oxide was added to the mixed solution, stirred for 30 minutes, 0.5 parts of polyethylene glycol were added, and stirring was continued for 3 hours, the solid product was centrifuged, washed, and vacuum dried at 80°C for 12 hours to obtain modified graphene oxide.

[0047] Dissolve 50 parts of methyltrimethoxysilane in 60 parts of ethanol, stir until completely dissolved to obtain a mixed solution; slowly add 1 part of γ-aminopropyltriethoxysilane to the mixed solution, stir for 40 minutes, add 0.2 parts of dibutyltin dilaurate, continue stirring for 15 minutes to obtain a mixture; remove ethanol from the mixture by reduced pressure distillation to obtain silane-modified silicone.

[0048] 95 parts of carbon fiber reinforced epoxy resin, 25 parts of silicon carbide and 12 parts of boron nitride were added to a stirring container in sequence, and stirred at 800 rpm for 15 minutes to obtain a slurry; ethanol was added to the slurry to adjust the viscosity to 1000 mPa·s, and then degassed at -0.095 MPa for 10 minutes to obtain a hard layer mixed slurry.

[0049] 20 parts of modified graphene oxide and 2 parts of composite coupling agent were added to 20 parts of N-methylpyrrolidone and stirred for 15 minutes to obtain a mixed slurry; the mixed slurry was evenly coated on the surface of the polyimide film with a thickness of 10 μm; the polyimide film was pre-dried at 80°C for 15 minutes and then cured at 150°C for 1.5 hours to obtain a high temperature resistant layer.

[0050] 90 parts of silane-modified silicone, 8 parts of polytetrafluoroethylene powder and 2 parts of molybdenum disulfide nanosheets were added to a stirring container in sequence, and stirred at 1100 rpm for 25 minutes to obtain a slurry; ethanol was added to the slurry to adjust the viscosity to 1200 mPa·s, and then 0.5 parts of BYK-066N were added, stirred for 30 minutes to remove bubbles, and the anti-sticking layer slurry was obtained after standing for 30 minutes.

[0051] Prepare the tire mat:

[0052] S1 sandwiches the foam between two layers of vinylon fiber pads and obtains the base layer by hot pressing. The temperature of hot pressing is 160℃, the pressure is 1MPa, and the time is 15min.

[0053] S2: Coat the hard layer mixed slurry on one side of the base layer, first heat it at 80℃ for 2h for pre-gelling, then cure it at 150℃ for 4h, and finally compact it with a pressure roller at 60℃ for 5min to obtain a hard layer with a thickness of 0.3mm.

[0054] S3: Coat high-strength adhesive on the hard layer, let it stand for 5 minutes, and then hot-press the high-temperature resistant layer. The hot-pressing temperature is 220℃, the pressure is 2.5MPa, and the time is 20min.

[0055] S4 sprays the anti-sticking layer slurry on the high temperature resistant layer with high pressure and airless spraying. The nozzle diameter of the spraying is 0.5mm, the pressure is 15MPa, the spraying thickness is 60μm, and it is heated at 100℃ for 10min, then heated to 200℃ and heated for another 8min. Finally, it is compacted with a pressure roller to obtain the anti-sticking layer. The pressure of the pressure roller is 0.3MPa and the temperature is 80℃. Finally, the semi-finished pad is obtained by hot pressing for 20min as a whole. The temperature of the hot pressing is 230℃ and the pressure is 2.5MPa.

[0056] S5 cools the semi-finished mat and then rolls it up and packs it to obtain the tire mat.

[0057] Embodiment 2-5

[0058] Referring to the parameter conditions in Example 1, the specific differences are shown in Table 1.

[0059] Table 1 Parameter conditions of Examples 1-5

[0060]

[0061]

[0062] Comparative Example 1

[0063] Refer to the parameter conditions in Example 1, except that only epoxy resin is added and carbon fiber modification is not used.

[0064] Comparative Example 2

[0065] The parameter conditions in Example 1 are referred to, except that no carbon fiber reinforced epoxy resin is added.

[0066] Comparative Example 3

[0067] The parameter conditions in Example 1 are referred to, except that silicon carbide is not added.

[0068] Comparative Example 4

[0069] The parameters and conditions in Example 1 are the same, except that no boron nitride is added.

[0070] Comparative Example 5

[0071] The parameter conditions in Example 1 are referred to, except that no hard layer is prepared.

[0072] Comparative Example 6

[0073] Refer to the parameter conditions in Example 1, except that no foam is added to the base layer.

[0074] Experimental Example 1 Mechanical Properties and Wear Resistance Test

[0075] The elongation at break of Examples 1-5 and Comparative Examples 1-6 was tested according to ASTM D5035; the tear strength of Examples 1-5 and Comparative Examples 1-6 was tested according to ASTM D1424; and the wear resistance of Examples 1-5 and Comparative Examples 1-6 was tested according to ASTM D4966. The results are shown in Table 2.

[0076] Table 2 Mechanical properties and wear resistance tests of Examples 1-5 and Comparative Examples 1-6

[0077]

[0078]

[0079] It can be found from Table 2 that in Comparative Examples 1-2, if the epoxy resin is not modified or the carbon fiber reinforced epoxy resin is not added, a certain strength cannot be provided to the tire mat, and the mechanical properties of the tire mat at this time are lower than those of the embodiment; in the process of synthesizing the carbon fiber reinforced epoxy resin, a carbonyl group of the acid anhydride reacts with the epoxy group to generate an ester bond and a carboxyl group, and the newly generated carboxyl group can react with another epoxy group to form an ether bond and an ester bond, and finally form a three-dimensional network structure of the body polymer, and this cross-linked structure gives the epoxy resin good mechanical properties, thereby improving the overall mechanical properties. Since silicon carbide has high hardness and wear resistance, adding it to the hard layer can increase the hardness of the mat surface, so that it can resist external friction, wear and scratches, and extend the service life of the mat. In Comparative Example 3, silicon carbide is not added, and the mechanical properties of the tire mat are reduced. Boron nitride has good self-lubricating properties, can reduce the friction coefficient of the hard layer surface, make the pad cloth smoother during use, reduce friction with other parts, reduce energy loss, and also help prevent the pad cloth from sticking to other objects. In Example 4, no boron nitride is added, and the mechanical properties are reduced. In Example 5, no hard layer is prepared, the tire pad cloth cannot withstand high-intensity impact, and the mechanical properties are low; in the hard layer, epoxy resin is used as a bonding matrix to tightly combine carbon fiber, silicon carbide and boron nitride to form a uniform composite material system, in which the components can work better together through interface interaction; carbon fiber can transfer stress to silicon carbide and boron nitride through epoxy resin, so that they can jointly withstand external forces, thereby improving the mechanical properties of the entire hard layer. At the same time, the presence of silicon carbide and boron nitride can further enhance the interface bonding strength between epoxy resin and carbon fiber, and improve the overall performance of the composite material. In Comparative Example 6, without adding foam, the tire pad cannot be provided with a cushioning capacity, resulting in a reduction in its mechanical capacity; the base layer has a certain flexibility and toughness, which can provide the pad with basic strength and tensile resistance, and the hard layer can enhance the overall supporting capacity of the pad, improve its mechanical properties, and thus improve durability.

[0080] Embodiment 6-10

[0081] Referring to the parameter conditions in Example 3, the specific differences are shown in Table 3.

[0082] Table 3 Parameter conditions of Example 3 and Examples 6-10

[0083]

[0084]

[0085] Comparative Example 7

[0086] Refer to the parameter conditions in Example 3, the difference is that only epoxy resin is added and no polyurethane prepolymer modification is used.

[0087] Comparative Example 8

[0088] The parameter conditions are the same as those in Example 3, except that no modified epoxy resin is added.

[0089] Comparative Example 9

[0090] The parameters and conditions in Example 3 are the same, except that no carbon nanotubes are added.

[0091] Comparative Example 10

[0092] The parameter conditions are the same as those in Example 3, except that no aluminum borate whiskers are added.

[0093] Comparative Example 11

[0094] Refer to the parameter conditions in Example 3, except that only epoxy resin is used as the adhesive.

[0095] Experimental Example 2 Mechanical Properties and Wear Resistance Tests

[0096] Example 3, Examples 6-10 and Comparative Examples 7-11 were tested with reference to the test method in Experimental Example 1, and the results are shown in Table 4.

[0097] Table 4 Mechanical properties and wear resistance tests of Example 3, Examples 6-10 and Comparative Examples 7-11

[0098] Example Elongation at break / % Tear strength / N / mm Abrasion resistance / times Example 3 26.1 286 52125 Example 6 26.4 285 52143 Example 7 26.5 287 52156 Example 8 26.7 289 52187 Example 9 26.6 286 52153 Example 10 26.4 285 52141 Comparative Example 7 21.7 226 42568 Comparative Example 8 17.2 198 36421 Comparative Example 9 22.1 237 46214 Comparative Example 10 21.8 236 46158 Comparative Example 11 19.2 209 38947

[0099] It can be found from Table 4 that in Comparative Examples 7-8, when the epoxy resin is not modified or the modified epoxy resin is not added, the mechanical properties of the tire pad are lower than those of the embodiments. This is because during the synthesis of the modified epoxy resin, the active groups in the polyurethane prepolymer will chemically react with the hydroxyl groups in the epoxy resin to form chemical bonds; at the same time, the long-chain structure of the polyurethane prepolymer can play a toughening role in the network structure of the epoxy resin, improve the disadvantage of the epoxy resin being brittle after curing, and improve its performance; the epoxy resin itself has excellent bonding properties and can form strong chemical bonds and physical adsorption with the surfaces of a variety of materials. After modification, its bonding properties may be further improved, and it can better wet the surfaces of the high-temperature resistant layer and the hard layer, so that the high-strength adhesive is tightly combined with the two layers of materials. In Comparative Examples 9-10, if carbon nanotubes or aluminum borate whiskers are not added, the mechanical properties of the tire mat will be reduced. This is because carbon nanotubes have high strength and can be added to the adhesive to enhance the mechanical properties of the adhesive layer, so that the adhesive can withstand greater external forces, thereby enhancing the bonding strength between the high-temperature resistant layer and the hard layer, so that the adhesive layer can avoid brittle fracture when subjected to external force impact, and improve the reliability of interlayer bonding; aluminum borate whiskers have high hardness, making the adhesive layer more stable when subjected to pressure and shear force, and not easy to deform, thereby enhancing the bonding between the high-temperature resistant layer and the hard layer, so that it can withstand greater loads. In Comparative Example 11, only epoxy resin is used as an adhesive, and the mechanical properties of the tire mat are relatively low. Although epoxy resin has excellent bonding properties, the brittleness of epoxy resin is relatively large after curing, and it is difficult to tightly bond the high-temperature resistant layer and the hard layer. During the bonding process, the modified epoxy resin provides basic bonding and curing properties, the carbon nanotubes enhance the strength and toughness of the adhesive, and the aluminum borate whiskers increase the hardness. The combination of the three enables the high-strength adhesive to better withstand various external forces and improve its durability.

[0100] Examples 11-15

[0101] Referring to the parameter conditions in Example 8, the specific differences are shown in Table 5.

[0102] Table 5 Parameter conditions of Example 8 and Examples 11-15

[0103]

[0104] Comparative Example 12

[0105] Refer to the parameter conditions in Example 8, except that only graphene oxide is added without modification.

[0106] Comparative Example 13

[0107] Refer to the parameter conditions in Example 8, except that modified graphene oxide is not added.

[0108] Comparative Example 14

[0109] The parameters and conditions in Example 8 are referred to, except that only γ-aminopropyltriethoxysilane is added as a coupling agent.

[0110] Comparative Example 15

[0111] The parameters and conditions in Example 8 are referred to, except that only γ-glycidyloxypropyltrimethoxysilane is added as a coupling agent.

[0112] Comparative Example 16

[0113] Refer to the parameter conditions in Example 8, except that no composite coupling agent is added.

[0114] Experimental Example 3 High temperature resistance test

[0115] The heat shrinkage rates of Example 8, Examples 11-15 and Comparative Examples 12-16 were tested according to ASTM D4974 standard, and the results are shown in Table 6.

[0116] Table 6 High temperature resistance test of Example 8, Examples 11-15 and Comparative Examples 12-16

[0117] Example Thermal shrinkage / % Example 8 1.6 Embodiment 11 1.6 Example 12 1.5 Embodiment 13 1.4 Embodiment 14 1.5 Embodiment 15 1.5 Comparative Example 12 3.8 Comparative Example 13 5.9 Comparative Example 14 2.7 Comparative Example 15 2.9 Comparative Example 16 3.7

[0118] It can be found from Table 6 that in Comparative Examples 12-13, without modifying the graphene oxide or adding modified graphene oxide, the high temperature resistance of the tire mat is significantly lower than that of the embodiment, because in the modification process of the graphene oxide, the silanol groups produced by the hydrolysis of the silane coupling agent will undergo a condensation reaction with the hydroxyl groups on the surface of the graphene oxide to form a stable silicon-oxygen bond, thereby chemically bonding the silane coupling agent to the surface of the graphene oxide; graphene oxide itself has good high temperature resistance, and after modification, its high temperature resistance is further improved. It can form a heat insulation barrier at high temperature to prevent heat from being quickly transferred to the inside of the mat, thereby reducing the overall heating degree of the mat. In Comparative Examples 14-16, when a single coupling agent is used or a composite coupling agent is not used, the high temperature resistance of the tire mat will also decrease. Since the composite coupling agent can tightly connect the polyimide film, modified graphene oxide and the base material together, improving the interface bonding force, in a high temperature environment, this strong interface bonding can effectively transfer stress, avoid debonding between the components, and ensure the overall performance of the mat. In the high temperature resistant layer, the polyimide film provides the high temperature resistance of the main body, and the modified graphene oxide acts as a heat insulation barrier to reduce heat transfer. The two work together to enable the mat to withstand higher temperatures; the composite coupling agent ensures that the polyimide film and modified graphene oxide are firmly bonded to the base material at high temperatures by enhancing the interface bonding and improving the compatibility, ensuring the stability of the entire high temperature resistant layer structure, thereby synergistically improving the high temperature resistance of the mat and increasing the durability of the tire mat.

[0119] Examples 16-20

[0120] Referring to the parameter conditions in Example 13, the specific differences are shown in Table 7.

[0121] Comparative Example 17

[0122] The parameter conditions in Example 13 are referred to, except that only methyltrimethoxysilane is added without modification.

[0123] Comparative Example 18

[0124] The parameter conditions are the same as those in Example 13, except that no silane-modified silicone is added.

[0125] Comparative Example 19

[0126] Refer to the parameter conditions in Example 13, except that no polytetrafluoroethylene powder is added.

[0127] Comparative Example 20

[0128] The parameter conditions in Example 13 are referred to, except that molybdenum disulfide nanosheets are not added.

[0129] Comparative Example 21

[0130] Refer to the parameter conditions in Example 13, except that the anti-sticking layer and the high temperature resistant layer are swapped.

[0131] Experimental Example 4 Anti-sticking Performance Test

[0132] The peel strength of Example 13, Examples 16-20 and Comparative Examples 17-21 was tested according to ASTM D903 standard. The lower the peel strength, the better the anti-sticking performance. The results are shown in Table 7.

[0133] Table 7 Parameters and anti-sticking performance test of Example 13, Examples 16-20 and Comparative Examples 17-21

[0134]

[0135]

[0136] It can be found from Table 7 that in Comparative Examples 17-18, methyltrimethoxysilane is not modified or silane-modified silicone is not added, and the anti-sticking performance of the tire mat is poorer than that of the embodiment. During the modification process, a condensation reaction will occur between the silanol groups produced by the hydrolysis of the two silanes to form a silicon-oxygen bond, thereby connecting γ-aminopropyltriethoxysilane to the molecular chain of the methyltrimethoxysilane hydrolyzate, thereby achieving a preliminary modification and combination of the two silanes, so that the modified material has the characteristics of low surface energy, and can form a uniform hydrophobic and oleophobic film on the surface of the mat, which can reduce the adhesion between the mat surface and other substances, making it difficult for foreign substances to adhere to the mat; at the same time, the silicon-oxygen bond structure in the silane-modified silicone has good flexibility and chemical stability, which can improve the durability and wear resistance of the film and ensure the long-term stability of the anti-sticking performance. In Comparative Examples 19-20, the anti-sticking performance of the tire mat cloth decreased without adding polytetrafluoroethylene powder or molybdenum disulfide nanosheets. This is because the polytetrafluoroethylene powder in the anti-sticking layer can be filled into the surface pores of the mat cloth, making the surface of the mat cloth smoother and flatter, reducing the surface roughness, thereby reducing the contact area with other objects and further reducing the adhesion; molybdenum disulfide nanosheets have a layered structure, the interaction between layers is weak, and it is easy to slide. It can form a self-lubricating coating on the surface of the mat cloth. When an object contacts the mat cloth, the interlayer sliding of the molybdenum disulfide nanosheets can reduce friction and prevent the object from sticking to the mat cloth. In Comparative Example 21, the positions of the anti-sticking layer and the high-temperature resistant layer are changed, and the anti-sticking performance of the tire mat cloth is the lowest among all the samples. At this time, the first thing that the tire mat cloth contacts with the tire is the high-temperature resistant layer, and the anti-sticking layer cannot play its role, resulting in poor anti-sticking effect. Therefore, the synergistic effect of silane-modified silicone, polytetrafluoroethylene micropowder and molybdenum disulfide nanosheets makes the surface of the mat have both low surface energy and smooth surface and self-lubricating properties, which comprehensively improves the anti-stick properties of the mat from multiple aspects and enables it to effectively prevent the adhesion of various substances.

[0137] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tire mat with a high temperature resistant coating, characterized in that: The tire mat includes a base layer, a hard layer, a high temperature resistant layer and an anti-sticking layer, and the hard layer and the high temperature resistant layer are bonded by a high-strength adhesive; The base layer includes vinylon fiber pad cloth and foam; The hard layer includes carbon fiber reinforced epoxy resin, silicon carbide and boron nitride; The high temperature resistant layer comprises a polyimide film, modified graphene oxide and a composite coupling agent; the modified graphene oxide comprises graphene oxide and γ-glycidyloxypropyltrimethoxysilane; The anti-sticking layer includes silane-modified silicone, polytetrafluoroethylene powder and molybdenum disulfide nanosheets; the silane-modified silicone includes methyltrimethoxysilane and γ-aminopropyltriethoxysilane; The high-strength adhesive comprises modified epoxy resin, carbon nanotubes and aluminum borate whiskers; the modified epoxy resin comprises epoxy resin E-51 and polyurethane prepolymer.

2. The tire mat with a high temperature resistant coating according to claim 1, characterized in that: The composite coupling agent comprises γ-aminopropyl triethoxysilane and γ-glycidyloxypropyl trimethoxysilane, and the weight ratio of the γ-aminopropyl triethoxysilane to the γ-glycidyloxypropyl trimethoxysilane is 2-5:

1.

3. A method for preparing a tire mat with a high temperature resistant coating, characterized in that: The tire mat according to claim 1 is prepared, wherein the preparation method comprises the following steps: S1: sandwich the foam between two layers of vinylon fiber pads, and obtain a base layer by hot pressing. The hot pressing temperature is 160°C, the pressure is 1 MPa, and the time is 15 minutes. S2: coating a hard layer mixed slurry on one side of the base layer, first heating at 80°C for 2h for pre-gelling, then curing at 150°C for 4h, and finally compacting with a pressure roller, the treatment temperature is 60°C, the time is 5min, to obtain a hard layer with a thickness of 0.3mm-0.5mm; S3: coating a high-strength adhesive on the hard layer, leaving it to stand for 5 minutes, and then hot-pressing the high-temperature resistant layer, wherein the hot-pressing temperature is 220°C-270°C, the pressure is 2.5MPa, and the time is 20 minutes; S4: spraying the anti-sticking layer slurry on the high temperature resistant layer by airless spraying under high pressure, wherein the nozzle diameter of the spraying is 0.5 mm, the pressure is 15 MPa, the thickness of the spraying is 60 μm-80 μm, and the anti-sticking layer is obtained by hot-drying at 100°C for 10 minutes, then heating to 200°C and hot-drying for another 8 minutes, and finally compacting with a pressure roller to obtain the anti-sticking layer, wherein the pressure of the pressure roller is 0.3 MPa and the temperature is 80°C; finally, the semi-finished pad is obtained by hot-pressing the whole for 20 minutes, wherein the temperature of the hot-pressing is 230°C and the pressure is 2.5 MPa; S5: cooling the semi-finished tire mat and then rolling and packaging the semi-finished tire mat.

4. The method for preparing a tire mat with a high temperature resistant coating according to claim 3, characterized in that: In terms of weight, the preparation method of the hard layer mixed slurry in S2 is as follows: 95-105 parts of carbon fiber reinforced epoxy resin, 25 parts of silicon carbide and 12 parts of boron nitride are added to a stirring container in sequence, and stirred at 800 rpm for 15 minutes to obtain a slurry; ethanol is added to the slurry to adjust the viscosity to 1000 mPa·s-1300 mPa·s, and then degassing is performed to obtain the hard layer mixed slurry; The preparation method of the carbon fiber reinforced epoxy resin is as follows: 20 parts of methyltetrahydrophthalic anhydride are slowly added to 60 parts of epoxy resin E-51, and stirred for 15 minutes at a stirring speed of 300rpm-500rpm to obtain a mixture A; 3 parts of 2,4,6-tris(dimethylaminomethyl)phenol are added to the mixture A, and stirring is continued for 10 minutes to obtain a mixture B; 35-45 parts of chopped carbon fibers are placed in the mixture B and impregnated for 1.5 hours at a vacuum degree of -0.1MPa to obtain impregnated carbon fibers; the impregnated carbon fibers are placed in a mold, first pre-pressed at 0.8MPa for 10 minutes, then gradually increased to 3MPa, and cured at 130°C for 3 hours to obtain a cured product; the cured product is cooled and demolded to obtain the carbon fiber reinforced epoxy resin.

5. The method for preparing a tire mat with a high temperature resistant coating according to claim 3, characterized in that: In parts by weight, the preparation method of the high-strength adhesive in S3 is: 100 parts of modified epoxy resin, 1-3 parts of carbon nanotubes and 5-10 parts of aluminum borate whiskers are added to a stirring container in sequence, and stirred for 25 minutes to obtain a mixture; 0.5 parts of BYK-066N are added to the mixture, and the high-strength adhesive is obtained after stirring and standing; The preparation method of the modified epoxy resin is as follows: 100 parts of epoxy resin E-51 are heated to 50° C., 10-20 parts of polyurethane prepolymer are slowly added to the epoxy resin E-51, stirred for 40 minutes, 30 parts of diaminodiphenyl sulfone are added, stirring is continued for 10 minutes to 15 minutes, and degassing is performed at -0.095 MPa for 10 minutes to obtain the modified epoxy resin.

6. The method for preparing a tire mat with a high temperature resistant coating according to claim 3, characterized in that: In parts by weight, the preparation method of the high temperature resistant layer in S3 is: adding 20-30 parts of modified graphene oxide and 2 parts of a composite coupling agent to 20 parts of N-methylpyrrolidone, stirring for 15 minutes, and obtaining a mixed slurry; uniformly coating the mixed slurry on the surface of a polyimide film, with a thickness controlled at 10 μm-50 μm; pre-drying the polyimide film at 80° C. for 15 minutes, and then curing at 150° C.-200° C. for 1.5 hours, to obtain the high temperature resistant layer; The preparation method of the modified graphene oxide is as follows: drying 80-90 parts of graphene oxide at 80° C. for 2 hours to obtain pretreated graphene oxide; dissolving 10 parts of γ-glycidyloxypropyltrimethoxysilane in 100 parts of ethanol to obtain a mixed solution; adding the pretreated graphene oxide to the mixed solution, stirring for 30 minutes to 60 minutes, adding 0.5 parts of polyethylene glycol, continuing to stir for 3 hours, centrifuging the solid product, washing it, and vacuum drying it for 12 hours to obtain the modified graphene oxide.

7. The method for preparing a tire mat with a high temperature resistant coating according to claim 3, characterized in that: In parts by weight, the preparation method of the anti-sticking layer slurry in S4 is as follows: 90-100 parts of silane-modified silicone, 8 parts of polytetrafluoroethylene powder and 2 parts of molybdenum disulfide nanosheets are added to a stirring container in sequence, and stirred at 1100 rpm for 25 minutes to obtain a slurry; ethanol is added to the slurry to adjust the viscosity to 1200 mPa·s-1500 mPa·s, and then 0.5 parts of BYK-066N are added, and the anti-sticking layer slurry is obtained after stirring and standing. The preparation method of the silane-modified silicone is as follows: dissolving 50-60 parts of methyltrimethoxysilane in 60 parts of ethanol, stirring until completely dissolved to obtain a mixed solution; slowly adding 1-5 parts of γ-aminopropyltriethoxysilane to the mixed solution, stirring for 40 minutes, adding 0.2 parts of dibutyltin dilaurate, and continuing to stir for 15 minutes to obtain a mixture; and removing the ethanol from the mixture by reduced pressure distillation to obtain the silane-modified silicone.

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