Low-temperature-resistant and wet-skid-resistant tread rubber for new energy automobile and tire of low-temperature-resistant and wet-skid-resistant tread rubber

Abstract

The invention provides low-temperature-resistant and wet-skid-resistant tread rubber for a new energy automobile and a tire of the tread rubber, and relates to the technical field of rubber composite materials. The low-temperature-resistant and wet-skid-resistant tread rubber for the new energy automobile comprises a tread layer, a supporting layer and a buffer layer, the tread layer is located on the upper layer of the supporting layer, and the buffer layer is located on the lower layer of the supporting layer; a plurality of rubber convex blocks are arranged on the tread layer, and anti-skid nails are arranged in grooves among the rubber convex blocks; each anti-skid nail comprises a nail cap, a nail body and a nail head which are connected in sequence, a fixing piece is arranged on each nail body, a plurality of steel thorns are arranged on each top cap, each nail body is embedded into the supporting layer through the corresponding fixing piece, each top cap is embedded into the supporting layer through the corresponding steel thorns, each top head penetrates out of the tread layer, and the height of the part, penetrating out of the tread layer, of each top head is smaller than that of each rubber convex block. The tire provided by the invention has low temperature resistance and wet skid resistance at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber composite materials, and in particular to a low-temperature-resistant and anti-slip tread rubber and a tire thereof for new energy vehicles. Background Art

[0002] In areas with low temperatures and snowy weather all year round, the use of winter tires is gaining more and more attention from car users. Winter tires are mainly used in low temperatures and on snowy roads, which requires the hardness of the tire tread rubber to be lower than that of ordinary tires at low temperatures, and to have excellent grip on ice and snow to improve the tire's maneuverability and ensure driving safety.

[0003] In the prior art, butadiene rubber is usually added to natural rubber. The glass transition temperature Tg of butadiene rubber is -100°C, which is the best synthetic rubber for cold resistance. It can reduce the hardening degree of tread rubber at low temperatures and increase the contact area between the tire tread and the ground. However, butadiene rubber has poor anti-wet skid resistance. It is impossible to simultaneously ensure the low temperature resistance and anti-wet skid resistance of the tire. Summary of the invention

[0004] In order to solve the above problems, a low-temperature resistant and anti-wet-skid tread rubber and a tire thereof for new energy vehicles are provided. The tread rubber of the tire is obtained by vulcanizing and laminating a tread layer, a support layer and a buffer layer, so as to meet the low-temperature resistance performance of the tire. In addition, by arranging anti-skid spikes to cooperate with the tread layer and the support layer, the anti-wet-skid performance of the tire can be met. The setting of the buffer layer can avoid poor compatibility between rubber materials due to excessive mechanical strength of the support layer.

[0005] On the one hand, the present invention provides a low-temperature-resistant and anti-wet-skid tread rubber for new energy vehicles. The low-temperature-resistant and anti-wet-skid tread rubber for new energy vehicles includes a tread layer, a support layer and a buffer layer. The tread layer is located on the upper layer of the support layer, and the buffer layer is located on the lower layer of the support layer; a plurality of rubber bumps are provided on the tread layer, and anti-skid spikes are provided in the grooves between the rubber bumps.

[0006] The anti-slip spike includes a spike cap, a spike body and a spike head which are connected in sequence. A fixing piece is provided on the spike body, and a plurality of steel spikes are provided on the top cap. The spike body is embedded in the supporting layer through the fixing piece, and the top cap is embedded in the supporting layer through the steel spikes. The top head passes through the tread layer, and the height of the part of the top head passing through the tread layer is less than the height of the rubber bump.

[0007] Optionally, the components of the tread layer include, by weight, 40-50 parts of polypropylene, 10-20 parts of thermoplastic elastomer, 30-40 parts of chloroprene rubber, 20-30 parts of maleic anhydride-methyl vinyl ether copolymer, 20-30 parts of fumed silica, and 10-20 parts of low-temperature resistant particles.

[0008] Optionally, the thermoplastic elastomer is one or more of styrene-butadiene-styrene block copolymer (SBS for short), styrene-isoprene-styrene copolymer (SIS for short), and hydrogenated styrene-butadiene block copolymer (SEBS for short).

[0009] Optionally, the preparation method of maleic anhydride-methyl vinyl ether copolymer includes the following steps: in a nitrogen environment, maleic anhydride, tert-butyl benzoyl peroxide and ethanol are mixed evenly to obtain a reserve solution; the reserve solution is heated to 50-60°C and then blended with methyl vinyl ether, and reacted at a constant temperature for 4-7 hours to obtain a reaction solution; the reaction solution is blended with petroleum ether, and after the polymer is precipitated, it is dried to obtain a maleic anhydride-methyl vinyl ether copolymer.

[0010] Optionally, the preparation method of the low-temperature resistant particles comprises the following steps: S1, firstly, subjecting perfluoroethyl vinyl ether, nano rigid particles, tetrafluoroethylene, perfluoromethyl vinyl ether and 4-bromo-tetrafluoro-1-butene to emulsion polymerization to obtain a perfluoroether elastic emulsion; subjecting tetrafluoroethylene, perfluoropropyl vinyl ether and 4-bromo-tetrafluoro-1-butene to emulsion polymerization to obtain a polytetrafluoroethylene emulsion;

[0011] S2, mixing the perfluoroether elastic emulsion with the polytetrafluoroethylene emulsion, coagulating and coprecipitating and drying to obtain a perfluoroether elastomer powder, and then plasticizing the perfluoroether elastomer powder to obtain a modified perfluoroether elastomer;

[0012] S3. Add 2wt% 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane, 3wt% triallyl isocyanurate and 5wt% magnesium oxide to the modified perfluoroether elastomer, followed by paving, mixing, compression molding and secondary vulcanization to obtain low-temperature resistant particles.

[0013] The nano rigid particles are a solid solution of titanium oxide and aluminum oxide, and the mass ratio of titanium oxide to aluminum oxide is (2-3):1.

[0014] Optionally, the support layer is composed of component A and component B by weight, wherein component A includes 50-70 parts of polyester polyol, 30-40 parts of diisocyanate, 2-5 parts of inhibitor, 2-5 parts of low molecular weight polyol, and 5-10 parts of foaming agent; component B includes 30-40 parts of terminal amine polyether CAD-400, 10-20 parts of 4,4'-diaminodiphenyl ether, 5-10 parts of diethyltoluenediamine, 5-10 parts of dimethylthiodiaminotoluene, 10-20 parts of nano-silica, 2-5 parts of polyphosphate dispersant, and 1-3 parts of polyether siloxane copolymer type defoamer.

[0015] Optionally, the polyester polyol has a number average molecular weight of 1000-3000, a functionality of 2-3, and a viscosity of ≤8000 mPa·S (25° C.).

[0016] Optionally, the diisocyanate is 4,4'-diphenylmethane diisocyanate or 2,4'-diphenylmethane diisocyanate.

[0017] Optionally, the inhibitor is phosphoric acid and / or benzoyl chloride.

[0018] Optionally, the low molecular weight polyol is ethylene glycol or glycerol. The blowing agent is water.

[0019] Optionally, the components of the buffer layer include, by weight, 30-50 parts of natural rubber, 20-50 parts of solution-polymerized styrene-butadiene rubber, 20-40 parts of flexible filler, 20-50 parts of fumed silica, 10-20 parts of operating oil, 10-20 parts of silane coupling agent, 1-3 parts of antioxidant, 2-4 parts of accelerator, 2-8 parts of activator and 2-4 parts of vulcanizer.

[0020] Optionally, the method for preparing the flexible filler comprises the following steps:

[0021] The tartaric acid containing hydroxyl groups and glycerol with fatty side chains are mixed, tetrabutyl titanate as a catalyst is added, reacted at a temperature of 140-160°C, and washed and dried in sequence to obtain a flexible filler;

[0022] Wherein, the molar ratio of tartaric acid to glycerol is 3:(1-2).

[0023] Optionally, the process oil is one or more of treated aromatic oil (TDAE) or residual aromatic extract (RAE) or medium soluble extract (MES).

[0024] Optionally, the antioxidant is at least one of physical protective wax, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (abbreviated as antioxidant 6PPD) and 2,2,4-trimethyl-1,2-dihydroquinoline polymer (abbreviated as antioxidant RD).

[0025] Optionally, the accelerator is N-tert-butyl-2-benzothiazole sulfenamide.

[0026] Optionally, the active agent is zinc oxide or stearic acid.

[0027] Optionally, the vulcanizing agent is at least one of dibenzoyl peroxide, tetramethylthiuram disulfide, barium peroxide, cadmium peroxide, magnesium peroxide, zinc peroxide, bis(2,4-dichloroformyl) peroxide, di-tert-butyl peroxide, 1,4-di-tert-butylperoxyisopropylbenzene, diisopropyl peroxide, tert-butyl perbenzoate, tert-butyl isopropyl peroxide, isochloropropyl peroxide, tert-butyl isopropyl carbonate, and tert-butyl peroxycarbonate.

[0028] Optionally, the silane coupling agent is γ-aminopropyl triethoxysilane (abbreviated as KH550), γ-(2,3-epoxypropoxy)propyl trimethoxysilane (abbreviated as KH560), γ-(methacryloyloxy)propyl trimethoxysilane (abbreviated as KH570), γ-mercaptopropyl triethoxysilane (abbreviated as KH580), γ-mercaptopropyl trimethoxysilane (abbreviated as KH590), γ-aminoethylaminopropyl trimethoxysilane (abbreviated as KH900) , N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane (abbreviated as KH602), bis-(γ-triethoxysilylpropyl) tetrasulfide (abbreviated as Si69), bis-(γ-triethoxysilylpropyl) disulfide (abbreviated as Si75), vinyltriethoxysilane, vinyltrimethoxysilane, ethyltriacetoxysilane, methyltrimethoxysilane, methyltriethylketoximesilane, vinyltriethylketoximesilane or any combination thereof.

[0029] Optionally, the method for preparing the tread layer comprises the following steps:

[0030] Polypropylene, low-temperature resistant particles, fumed silica and maleic anhydride-methyl vinyl ether copolymer are mixed and reacted at a temperature of 90-120°C to obtain a first product, and then the first product is melt-blended with chloroprene rubber and a thermoplastic elastomer at a temperature of 70-90°C to obtain a tread layer.

[0031] Optionally, the method for preparing the support layer comprises the following steps:

[0032] (1) mixing a low molecular weight polyol, an inhibitor and a foaming agent, adding diisocyanate and mixing, and then adding polyester polyol, reacting at a temperature of 70-80° C. to obtain component A;

[0033] (2) melt-mixing the amine-terminated polyether CAD-400, nano-silica, polyphosphate dispersant, and polyether siloxane copolymer defoamer, and reacting at a temperature of 70-80° C. to obtain component B;

[0034] (3) Component A and component B are mixed evenly in a mass ratio of (30-50):1 and molded to obtain a support layer.

[0035] Optionally, the method for preparing the buffer layer comprises the following steps:

[0036] (1) mixing natural rubber, solution polymerized styrene-butadiene rubber and flexible filler in one step at a temperature of 40-50° C., then adding fumed silica, process oil, silane coupling agent, antioxidant and activator in two steps at a temperature of 120-130° C., and then discharging the rubber to obtain a mixed rubber;

[0037] (2) The rubber compound, the accelerator and the vulcanizing agent are mixed in three steps at a temperature of 70-80° C. to obtain a buffer layer.

[0038] Optionally, the fixing member is a plurality of anti-skid protrusions arranged at certain intervals on the surface of the nail body, and the shape of the anti-skid protrusions can be trapezoidal, quadrilateral or triangular. The anti-skid protrusions are arranged on the surface of the nail body to enhance the vertical bearing capacity.

[0039] Optionally, the surface of the nail body is provided with anti-skid patterns, and the anti-skid patterns are in a V-shape, a herringbone shape, a diamond shape, an inclined shape, a parallel shape or a well shape.

[0040] Optionally, the length of the nail body is less than the thickness of the support layer. The support layer prepared by the present invention has good mechanical strength and tear strength, and also has good low temperature resistance. When the nail body of the anti-skid nail is embedded in the support layer, the support layer can play a bearing role, thereby improving the compatibility between the anti-skid nail and the support layer.

[0041] Optionally, the top cap is square, and the corners of the top cap are arc-shaped or chamfered. The top cap is set to be square, which can further increase the force-bearing area of ​​the top cap and improve the bearing capacity of the support layer for the anti-slip spikes.

[0042] Optionally, the cross section of the rubber protrusion is triangular, rectangular or Z-shaped.

[0043] Optionally, the tread layer thickness is 7-9mm;

[0044] and / or the support layer has a thickness of 10-15 mm;

[0045] And / or the buffer layer thickness is 4-7mm.

[0046] Another aspect of the present invention provides a tire, the tire comprising the above-mentioned low temperature resistant and anti-slip tread rubber for new energy vehicles. Further, the tire also comprises structures such as a cord layer and a bead, and the tire of the present invention can form the low temperature resistant and anti-slip tread rubber for new energy vehicles by injection molding and then vulcanization. However, the specific formation method of the tire of the present invention is not limited thereto, and those skilled in the art can form it according to actual conditions.

[0047] Compared with the prior art, the present invention achieves at least one of the following beneficial effects:

[0048] (1) The present invention provides a low-temperature-resistant and anti-wet-skid tread rubber and its tire for new energy vehicles. The tread rubber of the tire is obtained by vulcanizing and laminating a tread layer, a support layer and a buffer layer, which meets the low-temperature resistance performance of the tire. In addition, by arranging anti-skid spikes to cooperate with the tread layer and the support layer, the anti-wet-skid performance of the tire can be met. The buffer layer can avoid poor compatibility between rubber materials due to excessive mechanical strength of the support layer.

[0049] (2) The support layer prepared by the present invention has good mechanical strength and tear strength, and also has good low temperature resistance. When the nail body of the anti-skid nail is embedded in the support layer, the support layer can play a bearing role, thereby improving the compatibility between the anti-skid nail and the support layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0051] Figure 1 An exemplary embodiment of a low temperature resistant and anti-slip tread rubber structure for a new energy vehicle of the present invention is shown;

[0052] Figure 2 Another exemplary embodiment of the low temperature resistant and wet skid resistant tread rubber structure for new energy vehicles of the present invention is shown.

[0053] Description of reference numerals:

[0054] 1-tread layer; 2-support layer; 3-buffer layer; 4-rubber bump; 5-anti-slip spike; 51-top cap; 52-nail body; 53-nail head; 54-fixing piece. DETAILED DESCRIPTION

[0055] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0056] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0057] In addition, in the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0060] Example 1

[0061] refer to Figure 1 As shown, the low temperature resistant and anti-slip tread rubber for new energy vehicles comprises a tread layer 1, a support layer 2 and a buffer layer 3, wherein the tread layer 1 is located on the upper layer of the support layer 2, and the buffer layer 3 is located on the lower layer of the support layer 2; a plurality of rubber bumps 4 are provided on the tread layer 1, and the cross section of the rubber bumps 4 is rectangular, and anti-skid spikes 5 are provided in the grooves between the rubber bumps 4. The anti-skid spikes comprise a spike cap 51, a spike body 52 and a spike head 53 connected in sequence, and a fixing member 54 is provided on the spike body 52, and the fixing member 4 is a plurality of anti-skid protrusions provided on the surface of the spike body at a certain interval, and the shape of the anti-skid protrusions is a quadrilateral.

[0062] The top cap 51 is provided with a number of steel spikes (not shown in the figure), the nail body is embedded in the supporting layer through a fixing piece, the nail body and the fixing piece are an integral whole, the surface of the nail body is provided with anti-slip grooves (not shown in the figure), the top cap is embedded in the supporting layer through the steel spikes, the top head passes through the tread layer, and the height of the part of the top head passing through the tread layer is less than the height of the rubber bump.

[0063] The thickness of the tread layer is 7mm, the thickness of the support layer is 10mm, and the thickness of the buffer layer is 4mm.

[0064] The tread layer comprises 40 parts of polypropylene, 10 parts of styrene-butadiene-styrene block copolymer, 30 parts of chloroprene rubber, 20 parts of maleic anhydride-methyl vinyl ether copolymer, 20 parts of fumed silica and 10 parts of low-temperature resistant particles.

[0065] The preparation method of low temperature resistant particles comprises the following steps: S1, firstly, emulsion polymerizing perfluoroethyl vinyl ether, nano rigid particles, tetrafluoroethylene, perfluoromethyl vinyl ether and 4-bromo-tetrafluoro-1-butene to obtain perfluoroether elastic emulsion; and emulsion polymerizing tetrafluoroethylene, perfluoropropyl vinyl ether and 4-bromo-tetrafluoro-1-butene to obtain polytetrafluoroethylene emulsion. Among them, the nano rigid particles are a solid solution of titanium oxide and aluminum oxide, and the mass ratio of titanium oxide to aluminum oxide is 2:1.

[0066] S2, mixing the perfluoroether elastic emulsion with the polytetrafluoroethylene emulsion, coagulating and coprecipitating and drying and devolatilizing to obtain a perfluoroether elastomer powder, and then paving and plasticizing the perfluoroether elastomer powder to obtain a modified perfluoroether elastomer;

[0067] S3. Add 2wt% 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane, 3wt% triallyl isocyanurate and 5wt% magnesium oxide to the modified perfluoroether elastomer, followed by paving, mixing, compression molding and secondary vulcanization to obtain low-temperature resistant particles.

[0068] The support layer is composed of component A and component B, wherein component A includes 50 parts of polyester polyol, the number average molecular weight of the polyester polyol is 2000, the functionality is 2, the viscosity is 5000mPa·S (25°C), 30 parts of 4,4'-diphenylmethane diisocyanate, 2 parts of inhibitor phosphoric acid, 2 parts of ethylene glycol, and 10 parts of water; component B includes 30 parts of terminal amine polyether CAD-400, 10 parts of 4,4'-diaminodiphenyl ether, 5 parts of diethyltoluenediamine, 5 parts of dimethylthiodiaminotoluene, 10 parts of nano-silica, 2 parts of polyphosphate dispersant, and 1 part of polyether siloxane copolymer type defoamer.

[0069] The method for preparing the support layer comprises the following steps:

[0070] (1) Ethylene glycol, phosphoric acid and water are mixed, 4,4'-diphenylmethane diisocyanate is added and mixed, and then polyester polyol is added and reacted at a temperature of 70° C. to obtain component A;

[0071] (2) melt-mixing the amine-terminated polyether CAD-400, nano-silica, polyphosphate dispersant, and polyether siloxane copolymer defoamer, and reacting at a temperature of 70° C. to obtain component B;

[0072] (3) Component A and component B are mixed evenly in a mass ratio of 30:1 and molded to obtain a support layer.

[0073] The components of the buffer layer are calculated by weight and include 30 parts of natural rubber, 20 parts of solution-polymerized styrene-butadiene rubber, 20 parts of flexible filler, 20 parts of fumed silica, 10 parts of operating oil TDAE, 10 parts of KH550, 1 part of antioxidant 6PPD, 2 parts of accelerator N-tert-butyl-2-benzothiazole sulfonamide, 2 parts of activator zinc oxide and 2 parts of vulcanizing agent dibenzoyl peroxide.

[0074] The preparation method of the flexible filler comprises the following steps:

[0075] The tartaric acid containing hydroxyl groups and 2-methyl-1,2,3-propanetriol having a fatty side chain are mixed, tetrabutyl titanate as a catalyst is added, reacted at a temperature of 140°C, and washed and dried in sequence to obtain a flexible filler;

[0076] Wherein, the molar ratio of tartaric acid to glycerol is 3:1.

[0077] The method for preparing the buffer layer comprises the following steps:

[0078] (1) natural rubber, solution polymerized styrene-butadiene rubber and flexible filler are mixed in one step at a temperature of 40° C., and then fumed silica, process oil, silane coupling agent, antioxidant and activator are added and mixed in two steps at a temperature of 120° C., and then the rubber is discharged to obtain a mixed rubber.

[0079] (2) The rubber compound, the accelerator and the vulcanizing agent are kneaded in three steps at a temperature of 70° C. to obtain a buffer layer.

[0080] Example 2

[0081] refer to Figure 2 As shown, the low temperature resistant and wet skid resistant tread rubber for new energy vehicles comprises a tread layer 1, a support layer 2 and a buffer layer 3, wherein the tread layer 1 is located on the upper layer of the support layer 2, and the buffer layer 3 is located on the lower layer of the support layer 2; a plurality of rubber bumps 4 are provided on the tread layer 1, and the cross section of the rubber bumps 4 is rectangular, and anti-skid spikes 5 are provided in the grooves between the rubber bumps 4. The anti-skid spikes comprise a spike cap 51, a spike body 52 and a spike head 53 connected in sequence, and a fixing member 54 is provided on the spike body 52, and the fixing member 4 is a plurality of anti-skid protrusions provided on the surface of the spike body at certain intervals, and the shape of the anti-skid protrusions is a trapezoid.

[0082] The top cap 51 is provided with a number of steel spikes (not shown in the figure), the nail body is embedded in the supporting layer through a fixing piece, the nail body and the fixing piece are an integral whole, the surface of the nail body is provided with anti-slip grooves (not shown in the figure), the top cap is embedded in the supporting layer through the steel spikes, the top head passes through the tread layer, and the height of the part of the top head passing through the tread layer is less than the height of the rubber bump.

[0083] The thickness of the tread layer is 9mm, the thickness of the support layer is 15mm, and the thickness of the buffer layer is 7mm.

[0084] The tread layer comprises 50 parts of polypropylene, 20 parts of styrene-isoprene-styrene copolymer, 40 parts of chloroprene rubber, 30 parts of maleic anhydride-methyl vinyl ether copolymer, 30 parts of fumed silica and 20 parts of low-temperature resistant particles.

[0085] The preparation method of low temperature resistant particles comprises the following steps: S1, firstly, perfluoroethyl vinyl ether, nano rigid particles, tetrafluoroethylene, perfluoromethyl vinyl ether and 4-bromo-tetrafluoro-1-butene are subjected to emulsion polymerization to obtain perfluoroether elastic emulsion; tetrafluoroethylene, perfluoropropyl vinyl ether and 4-bromo-tetrafluoro-1-butene are subjected to emulsion polymerization to obtain polytetrafluoroethylene emulsion. Among them, the nano rigid particles are a solid solution of titanium oxide and aluminum oxide, and the mass ratio of titanium oxide to aluminum oxide is 3:1.

[0086] S2, mixing the perfluoroether elastic emulsion with the polytetrafluoroethylene emulsion, coagulating and coprecipitating and drying and devolatilizing to obtain a perfluoroether elastomer powder, and then paving and plasticizing the perfluoroether elastomer powder to obtain a modified perfluoroether elastomer;

[0087] S3. Add 2wt% 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane, 3wt% triallyl isocyanurate and 5wt% magnesium oxide to the modified perfluoroether elastomer, followed by paving, mixing, compression molding and secondary vulcanization to obtain low-temperature resistant particles.

[0088] The support layer consists of component A and component B, wherein component A includes 70 parts of polyester polyol, the number average molecular weight of the polyester polyol is 2000, the functionality is 2, the viscosity is 5000mPa·S (25°C), 40 parts of 2,4'-diphenylmethane diisocyanate, 2 parts of inhibitor benzoyl chloride, 3 parts of propylene glycol, and 10 parts of water; component B includes 40 parts of terminal amine polyether CAD-400, 10 parts of 4,4'-diaminodiphenyl ether, 10 parts of diethyltoluenediamine, 5 parts of dimethylthiodiaminotoluene, 15 parts of nano-silica, 2 parts of polyphosphate dispersant, and 1 part of polyether siloxane copolymer type defoamer.

[0089] The method for preparing the support layer comprises the following steps:

[0090] (1) mixing propylene glycol, benzoyl chloride and water, adding 2,4'-diphenylmethane diisocyanate and mixing, and then adding polyester polyol, and reacting at a temperature of 80° C. to obtain component A;

[0091] (2) melt-mixing the amine-terminated polyether CAD-400, nano-silica, polyphosphate dispersant, and polyether siloxane copolymer defoamer, and reacting at a temperature of 70° C. to obtain component B;

[0092] (3) Component A and component B are uniformly mixed in a mass ratio of 50:1 and molded to obtain a support layer.

[0093] The components of the buffer layer are calculated by weight and include 50 parts of natural rubber, 50 parts of solution-polymerized styrene-butadiene rubber, 20 parts of flexible filler, 20 parts of fumed silica, 10 parts of operating oil RAE, 10 parts of KH550, 2 parts of antioxidant RD, 4 parts of accelerator N-tert-butyl-2-benzothiazole sulfonamide, 4 parts of activator stearic acid and 4 parts of vulcanizing agent zinc peroxide.

[0094] The preparation method of the flexible filler comprises the following steps:

[0095] The tartaric acid containing hydroxyl groups and 2-methyl-1,2,3-propanetriol having a fatty side chain are mixed, tetrabutyl titanate as a catalyst is added, reacted at a temperature of 160°C, and washed and dried in sequence to obtain a flexible filler;

[0096] Wherein, the molar ratio of tartaric acid to glycerol is 3:2.

[0097] The method for preparing the buffer layer comprises the following steps:

[0098] (1) natural rubber, solution polymerized styrene-butadiene rubber and flexible filler are mixed in one step at a temperature of 50° C., and then fumed silica, process oil, silane coupling agent, antioxidant and activator are added and mixed in two steps at a temperature of 130° C., and then the rubber is discharged to obtain a mixed rubber.

[0099] (2) The rubber compound, the accelerator and the vulcanizing agent are kneaded in three steps at a temperature of 80° C. to obtain a buffer layer.

[0100] Example 3

[0101] Based on Example 2, the main difference is that no low-temperature resistant particles are added to the tread layer, and the other steps are the same as Example 2.

[0102] Example 4

[0103] Based on Example 2, the main difference is that the support layer is composed of component A only, and the other steps are the same as Example 2.

[0104] Comparative Example 1

[0105] The main difference from Example 1 is that no anti-slip studs are embedded.

[0106] Comparative Example 2

[0107] The main difference from Example 1 is that no supporting layer is provided.

[0108] Comparative Example 3

[0109] The main difference from Example 1 is that no buffer layer is provided.

[0110] The tread rubbers prepared in the examples and comparative examples were subjected to tire molding and vulcanization processes to produce tread samples, which were then tested for performance. The results are shown in Table 1.

[0111] Table 1

[0112]

[0113] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A low temperature resistant and anti-slip tread rubber for new energy vehicles, characterized in that: The low temperature resistant and anti-slip tread rubber for new energy vehicles comprises a tread layer, a support layer and a buffer layer, wherein the tread layer is located on the upper layer of the support layer, and the buffer layer is located on the lower layer of the support layer; a plurality of rubber convex blocks are provided on the tread layer, and anti-slip studs are provided in the grooves between the rubber convex blocks; The anti-slip spike includes a spike cap, a spike body and a spike head which are connected in sequence. A fixing piece is provided on the spike body, and a plurality of steel spikes are provided on the top cap. The spike body is embedded in the supporting layer through the fixing piece, and the top cap is embedded in the supporting layer through the steel spikes. The top head passes through the tread layer, and the height of the part of the top head passing through the tread layer is less than the height of the rubber bump.

2. The low temperature resistant and anti-wet skid resistant tread rubber for new energy vehicles according to claim 1, characterized in that: The components of the tread layer include 40-50 parts of polypropylene, 10-20 parts of thermoplastic elastomer, 30-40 parts of chloroprene rubber, 20-30 parts of maleic anhydride-methyl vinyl ether copolymer, 20-30 parts of fumed silica, and 10-20 parts of low-temperature resistant particles by weight. The support layer is composed of component A and component B by weight, wherein component A includes 50-70 parts of polyester polyol, 30-40 parts of diisocyanate, 2-5 parts of inhibitor, 2-5 parts of low molecular weight polyol, and 5-10 parts of foaming agent; component B includes 30-40 parts of terminal amine polyether CAD-400, 10-20 parts of 4,4'-diaminodiphenyl ether, 5-10 parts of diethyltoluenediamine, 5-10 parts of dimethylthiodiaminotoluene, 10-20 parts of nano silicon dioxide, 2-5 parts of polyphosphate dispersant, and 1-3 parts of polyether siloxane copolymer type defoamer; The components of the buffer layer are calculated by weight, including 30-50 parts of natural rubber, 20-50 parts of solution-polymerized styrene-butadiene rubber, 20-40 parts of flexible filler, 20-50 parts of fumed silica, 10-20 parts of operating oil, 10-20 parts of silane coupling agent, 1-3 parts of antioxidant, 2-4 parts of accelerator, 2-8 parts of activator and 2-4 parts of vulcanizer.

3. The low temperature resistant and anti-wet skid resistant tread rubber for new energy vehicles according to claim 2, characterized in that: The thermoplastic elastomer is one or more of styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene copolymer, and hydrogenated styrene-butadiene block copolymer; The preparation method of low-temperature resistant particles comprises the following steps: S1, firstly, subjecting perfluoroethyl vinyl ether, nano rigid particles, tetrafluoroethylene, perfluoromethyl vinyl ether and 4-bromo-tetrafluoro-1-butene to emulsion polymerization to obtain a perfluoroether elastic emulsion; subjecting tetrafluoroethylene, perfluoropropyl vinyl ether and 4-bromo-tetrafluoro-1-butene to emulsion polymerization to obtain a polytetrafluoroethylene emulsion; S2, mixing the perfluoroether elastic emulsion with the polytetrafluoroethylene emulsion, coagulating and coprecipitating and drying to obtain a perfluoroether elastomer powder, and then plasticizing the perfluoroether elastomer powder to obtain a modified perfluoroether elastomer; S3, adding 2wt% 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane, 3wt% triallyl isocyanurate and 5wt% magnesium oxide to the modified perfluoroether elastomer, followed by paving, mixing, compression molding and secondary vulcanization to obtain low-temperature resistant particles; The nano rigid particles are a solid solution of titanium oxide and aluminum oxide, and the mass ratio of titanium oxide to aluminum oxide is (2-3):

1.

4. The low temperature resistant and anti-wet skid resistant tread rubber for new energy vehicles according to claim 1, characterized in that: The method for preparing the tread layer comprises the following steps: The polypropylene, low-temperature resistant particles, fumed silica and maleic anhydride-methyl vinyl ether copolymer are mixed and reacted at a temperature of 90-120° C. to obtain a first product, and then the first product is melt-blended with chloroprene rubber and a thermoplastic elastomer at a temperature of 70-90° C. to obtain a tread layer; The method for preparing the support layer comprises the following steps: (1) mixing a low molecular weight polyol, an inhibitor and a foaming agent, adding diisocyanate and mixing, and then adding polyester polyol, reacting at a temperature of 70-80° C. to obtain component A; (2) melt-mixing the amine-terminated polyether CAD-400, nano-silica, polyphosphate dispersant, and polyether siloxane copolymer defoamer, and reacting at a temperature of 70-80° C. to obtain component B; (3) Component A and component B are mixed evenly in a mass ratio of (30-50):1 and molded to obtain a support layer.

5. The low temperature resistant and anti-wet skid resistant tread rubber for new energy vehicles according to claim 1, characterized in that: The fixing piece is a plurality of anti-skid protrusions arranged on the surface of the nail body at certain intervals, and the shape of the anti-skid protrusions is trapezoidal, quadrilateral or triangular.

6. The low temperature resistant and anti-wet skid resistant tread rubber for new energy vehicles according to claim 1, characterized in that: The surface of the nail body is provided with anti-skid patterns, and the anti-skid patterns are in V-shape, herringbone shape, diamond shape, inclined shape, parallel shape or well shape.

7. The low temperature resistant and anti-wet skid resistant tread rubber for new energy vehicles according to claim 1, characterized in that: The length of the nail body is less than the thickness of the supporting layer.

8. The low temperature resistant and anti-wet skid resistant tread rubber for new energy vehicles according to claim 1, characterized in that: The top cap is square, and the corners of the top cap are rounded or chamfered.

9. The low temperature resistant and anti-wet skid resistant tread rubber for new energy vehicles according to claim 1, characterized in that: The cross section of the rubber bump is triangular, rectangular or Z-shaped.

10. A tire, characterized in that: The tire comprises the low-temperature-resistant and anti-wet-skid tread rubber for new energy vehicles according to any one of claims 1 to 9.

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