Rubber material as well as preparation method and application thereof

Abstract

The invention provides a rubber material as well as a preparation method and application thereof, and relates to the technical field of materials, the rubber material comprises the following components in parts by weight: 100 parts of raw rubber; 4.75 to 11 parts of an activating agent; 2-4 parts of an anti-aging agent; 1-2 parts of a tackifier; 0.5 to 0.8 part of a bonding auxiliary agent; 0-4 parts of a plasticizer; 1-10 parts of a first reinforcing agent; 45 to 60 parts of a second reinforcing agent; 2-5 parts of a coupling agent; 2 to 6.5 parts of vulcanizing agent; 2.2 to 5.8 parts of an accelerant; 2-5 parts of a crosslinking auxiliary agent; 0-1 part of a methylene donor; and 0-0.5 part of a scorch retarder. Therefore, the rubber material has higher modulus at definite elongation and lower compression heat generation, thereby ensuring the bearing property and durability of the non-pneumatic tire.

Description

Technical Field

[0001] The present application relates to the field of material technology, and in particular to a rubber material and a preparation method and application thereof. Background Art

[0002] With the development of science and technology, non-pneumatic tires, as tires for the new generation of electric vehicles, have been increasingly widely studied and applied. Non-pneumatic tires usually consist of three parts: tread, spokes, and hub. The tread includes a shear layer, which together with the spokes provide the load-bearing capacity and durability (mileage) of the non-pneumatic tire. Therefore, the material for preparing the shear layer in the tread of the non-pneumatic tire is crucial.

[0003] At present, the shear layer in the tread of a non-pneumatic tire is prepared by a material similar to the rubber material in the belt layer of a pneumatic tire. Since in a pneumatic tire, the belt layer and the inflation pressure together provide the load-bearing capacity of the pneumatic tire, the rubber material of the belt layer is required to have high hardness, high 10% modulus of elongation (for example, it can reach about 5-9Mpa), high compression heat generation (for example, compression heat generation is greater than or equal to 30°C), etc. However, non-pneumatic tires have no inflation pressure, and the load-bearing capacity is mainly provided by the shear layer in the tread. Therefore, the load that the shear layer can withstand is higher than the force that the belt layer can withstand, and the 10% modulus of elongation of the rubber material corresponding to the shear layer may also be higher. At the same time, since the shear layer is generally thicker than the belt layer, its deformation heat accumulation is also higher, and high temperature will accelerate the aging of the rubber material. Therefore, the compression heat generation of the rubber material used to prepare the shear layer must not be too high. However, usually, if the modulus of elongation is large, the compression heat generation will be higher, and the larger the modulus of elongation, the higher the compression heat generation. As a result, the shear layer cannot be prepared with a rubber material with a high 10% modulus of elongation and not too high compression heat generation, which seriously affects the load-bearing and durability properties of the non-pneumatic tire.

[0004] Therefore, it is urgent to develop a new type of rubber material for the shear layer in the tread of a non-pneumatic tire to solve the above problems. Summary of the invention

[0005] The embodiments of the present application provide a rubber material and a preparation method and application thereof, thereby solving the problem that the conventional rubber material used for the shear layer in the tread of a non-pneumatic tire has a high modulus of elongation and high compression heat generation, which causes the rubber material to age easily and thus affects the load-bearing property and durability of the non-pneumatic tire.

[0006] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0007] In one aspect, a rubber material is provided, comprising, by weight:

[0008] Raw rubber, 100 parts;

[0009] Activator, 4.75-11 parts;

[0010] Anti-aging agent, 2-4 parts;

[0011] Thickener, 1-2 parts;

[0012] Adhesive additive, 0.5-0.8 parts;

[0013] Plasticizer, 0-4 parts;

[0014] First reinforcing agent, 1-10 parts;

[0015] Second reinforcing agent, 45-60 parts;

[0016] Coupling agent, 2-5 parts;

[0017] Vulcanizing agent, 2-6.5 parts;

[0018] Accelerator, 2.2-5.8 parts;

[0019] Cross-linking aid, 2-5 parts;

[0020] Methylene donor, 0-1 part;

[0021] Anti-scorch agent, 0-0.5 parts.

[0022] Furthermore, the raw rubber at least includes natural rubber, and the proportion of the natural rubber in the raw rubber is greater than or equal to 50%.

[0023] Furthermore, the reinforcing agent at least includes white carbon black.

[0024] Furthermore, the reinforcing agent also includes carbon black;

[0025] The proportion of white carbon black to the reinforcing agent is in the range of 40-50%;

[0026] The carbon black accounts for 5-10% of the reinforcing agent.

[0027] Furthermore, the coupling agent includes a silane coupling agent.

[0028] Furthermore, the cross-linking auxiliary agent includes at least one of isophthalic acid hydrazide, 1,6-bis(N,N'-dibenzothiazolecarbamoyl disulfide)-hexane, 1,6-bis(N,N-dibenzylthiocarbamoyl disulfide)hexane, and unsaturated amino derivative compounds.

[0029] Furthermore, the 10% modulus of elongation of the rubber material is in the range of 11-30 MPa;

[0030] and / or,

[0031] The compression heat generation of the rubber material is less than or equal to 20°C.

[0032] Further, the tensile strength of the rubber material is in the range of 25-27 MPa;

[0033] and / or,

[0034] The elongation of the rubber material ranges from 300 to 500%;

[0035] and / or,

[0036] The static compression deformation rate of the rubber material is in the range of 8-12%;

[0037] and / or,

[0038] The crescent tear strength of the rubber material is in the range of 100-110 kN / m;

[0039] and / or,

[0040] The density of the rubber material is in the range of 1.10-1.20 g / cm 3 .

[0041] In another aspect, a non-pneumatic tire is provided, comprising at least a tread, the tread comprising a crown and at least one shear layer, the crown encapsulating all the shear layers;

[0042] The shear layer includes a non-elastic material and the rubber material mentioned above, wherein the rubber material covers the non-elastic material and is used to react with the non-elastic material during vulcanization.

[0043] On the other hand, a method for preparing the above-mentioned rubber material is provided, comprising the following steps:

[0044] The raw rubber is plasticized and compounded to obtain processed raw rubber;

[0045] After the treated raw rubber is subjected to bolt pressing and bolt lifting, the first reinforcing agent, the second reinforcing agent, the activator, the antioxidant, the tackifier, the adhesive aid, the plasticizer and the coupling agent are added and mixed evenly, and the bolt is pressed or the fuel is added after heating, and then the bolt is pressed, the bolt is lifted, the bolt is pressed and the glue is discharged after heating, so as to obtain a masterbatch;

[0046] The masterbatch is pressed for a period of time, the vulcanizing agent, the accelerator, the crosslinking aid, the methylene donor and the anti-scorch agent are added, and the masterbatch is repeatedly lifted and pressurized before the masterbatch is discharged to obtain the rubber material.

[0047] Compared with the prior art, this application has the following technical effects:

[0048] The embodiments of the present application provide a rubber material and a preparation method and application thereof, which increases the modulus of elongation of the vulcanized rubber and reduces compression heat generation by adopting a reinforcement system mainly composed of white carbon black and a joint chemical reaction with a silane coupling agent and a cross-linking aid, and the cross-linking aid can also chemically react with the raw rubber, thereby slowing down the thermal aging of the rubber material, meeting the material requirements of the shear layer of a non-pneumatic tire, and ensuring the load-bearing property and durability of the non-pneumatic tire.

[0049] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic diagram of the structure of a non-pneumatic tire provided in an embodiment of the present application;

[0052] Figure 2 A schematic diagram of the structure of another non-pneumatic tire provided in an embodiment of the present application;

[0053] Figure 3 A process flow chart of a rubber material preparation method provided in an embodiment of the present application;

[0054] Figure 4 A process flow chart of another rubber material preparation method provided in an embodiment of the present application;

[0055] Figure 5 A process flow chart of another rubber material preparation method provided in an embodiment of the present application;

[0056] Figure 6 A process flow chart of another rubber material preparation method provided in an embodiment of the present application;

[0057] Figure 7 A graph showing the tensile properties test results of a rubber material of a belt layer of a pneumatic tire provided in the related art;

[0058] Figure 8 This is a graph showing the tensile properties test results of the rubber material of the shear layer of a non-pneumatic tire provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0061] In the present application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b or c", or "at least one of a, b and c", can all represent: a, b, c, ab (i.e. a and b), ac, bc or abc, where a, b, c can be single or multiple, respectively.

[0062] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0063] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0064] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass described in the embodiment description of the present application can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

[0065] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0066] In the related art, materials similar to rubber materials in the belt layer of a pneumatic tire are usually used to prepare the shear layer of the tread of a non-pneumatic tire. Since the non-pneumatic tire mainly relies on the shear layer to provide bearing capacity, the shear layer needs to withstand a higher force than the belt layer, and the 10% modulus of elongation of the rubber material in the shear layer may also be higher. At the same time, since the shear layer is generally thicker than the belt layer, its deformation heat accumulation is also higher, and high temperature will accelerate the aging of the rubber material. Therefore, the compression heat generated by the rubber material used to prepare the shear layer cannot be too high. However, generally, if the modulus of elongation is large, the compression heat generated will be high, and the larger the modulus of elongation is, the higher the compression heat generated.

[0067] It can be seen that the rubber material of the belt layer of the pneumatic tire in the related art cannot meet the requirements of the shear layer of the non-pneumatic tire for the rubber material, resulting in an adverse effect on the load-bearing property and durability of the non-pneumatic tire.

[0068] In order to solve the above problems, in the first aspect, an embodiment of the present application provides a rubber material, which includes, by weight: raw rubber, 100 parts; activator, 4.75-11 parts; antioxidant, 2-4 parts; tackifier, 1-2 parts; adhesion promoter, 0.5-0.8 parts; plasticizer, 0-4 parts; first reinforcing agent, 1-10 parts; second reinforcing agent, 45-60 parts; coupling agent, 2-5 parts; vulcanizer, 2-6.5 parts; accelerator, 2.2-5.8 parts; cross-linking agent, 2-5 parts; methylene donor, 0-1 parts; scorch retarder, 0-0.5 parts.

[0069] In practical applications, the second reinforcing agent may include one or more combinations of white carbon black, carbon black, etc. Among them, white carbon black may include LK975MP, CSHD160, etc., and carbon black may include N330, N550, and N660, etc., thereby increasing the hardness, strength, and modulus of the rubber material through the second reinforcing agent.

[0070] Specifically, when the second reinforcing agent in the rubber material formula includes white carbon black and carbon black, the white carbon black is calculated by weight: 40-50 parts, and exemplary, the white carbon black can be calculated by weight 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts or 50 parts, etc.; the carbon black is calculated by weight: 5-10 parts, and exemplary, the carbon black can be calculated by weight 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc.

[0071] The coupling agent may include a silane coupling agent, etc. The silane coupling agent may produce a silane coupling reaction with white carbon black to increase the compatibility of white carbon black with raw rubber, wherein the silane coupling agent may include silicon-69, etc.

[0072] Specifically, when the coupling agent in the rubber material formula is silicon-69, the weight proportion of silicon-69 is 2-5 parts. For example, the weight proportion of silicon-69 can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts.

[0073] The crosslinking aid may include one or more combinations of isophthalic acid hydrazide (CSC920), 1,6-bis(N,N'-dibenzothiazolecarbamoyl disulfide)-hexane (WY9188), 1,6-bis(N,N-dibenzylthiocarbamoyl disulfide)hexane (KA9188), unsaturated amino derivative compounds (H9), etc.

[0074] Specifically, when the crosslinking aid in the rubber material formula is CSC920, WY9188, KA9188, or H9, CSC920 is 2-5 parts by weight, and for example, CSC920 can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, or 5 parts by weight; WY9188 is 2-5 parts by weight, and for example, WY9188 can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc.; KA9188 is calculated by weight: 2-5 parts, and KA9188 can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc. by weight; H9 is calculated by weight: 2-5 parts, and H9 can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc. by weight.

[0075] The CSC920 can act on the aldehyde group at the end of the natural rubber molecular chain, which can extend the rubber molecular chain, reduce the movement of the rubber molecular chain end and reduce the hysteresis loss. In addition, it can also effectively reduce the Payne effect of rubber materials and reduce the slip between the reinforcing agent (carbon black, white carbon black) and the molecular chain (rubber material).

[0076] Among them, WY9188 and KA9188 can introduce flexible carbon chains into the cross-linked network of the reaction system, thereby improving the thermal stability and dynamic flexural heat generation properties of rubber materials.

[0077] The H9 can provide polyamine compounds, which can form chemical bonds with silicon-69 and white carbon black. By adding new cross-linking chemical bonds, the cross-linking density can be effectively increased and the friction between molecules can be reduced, thereby increasing the modulus of the rubber material and reducing the heat generation of the rubber material.

[0078] In practical applications, the raw rubber at least includes natural rubber, that is, the embodiment of the present application adopts a sulfur vulcanization system mainly composed of natural rubber. Exemplarily, the weight percentage of the raw rubber is 100 parts.

[0079] Here, the raw rubber at least includes natural rubber means: the raw rubber may only include natural rubber, in which case the rubber material formula contains 100 parts of natural rubber; or, in addition to natural rubber, the raw rubber may also include other rubbers, such as butadiene rubber, styrene-butadiene rubber, etc. In this case, the raw rubber in the rubber material formula may include any one of natural rubber and butadiene rubber in a total of 100 parts, natural rubber and styrene-butadiene rubber in a total of 100 parts, natural rubber, butadiene rubber and styrene-butadiene rubber in a total of 100 parts. Of course, other rubbers may also be present together with natural rubber to form the raw rubber, which is subject to actual application.

[0080] In the case where the raw rubber includes natural rubber and other rubbers, the proportion of natural rubber in the raw rubber is greater than or equal to 50%. Exemplarily, the proportion of natural rubber in the raw rubber may be 50%, 60%, 70%, 80% or 90%, etc.

[0081] In practical applications, the above activator can reduce the activation energy of the reaction system, wherein the activator can include a combination of one or more of zinc oxide, stearic acid, etc.

[0082] Specifically, when the activator in the rubber material formula includes zinc oxide and stearic acid, the zinc oxide is calculated by weight: 4-8 parts, and exemplary, the zinc oxide can be calculated by weight 4 parts, 5 parts, 6 parts, 7 parts or 8 parts, etc.; the stearic acid is calculated by weight: 0.75-3 parts, and exemplary, the stearic acid can be calculated by weight 0.75 parts, 1 parts, 1.5 parts, 2 parts or 3 parts, etc.

[0083] In practical applications, the antioxidant can prolong the aging time of the reaction system, wherein the antioxidant can include a combination of one or more of RD, 4020, 4010NA, etc.

[0084] Specifically, when the antioxidant in the rubber material formula includes RD, 4020, and 4010NA, RD is calculated as 1-2 parts by weight. For example, RD can be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2 parts by weight; 4020 is calculated as 1-2 parts by weight. For example, 4020 can be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2 parts by weight; 4010NA is calculated as 1-2 parts by weight. For example, 4010NA can be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2 parts by weight.

[0085] In practical applications, the above-mentioned tackifier may include a tackifying resin, such as SL-T421, etc. The tackifier can make the rubber material disperse evenly, reduce heat generation and Mooney, and increase self-adhesion in the pre-vulcanization stage, which is helpful for the molding of non-pneumatic tires.

[0086] Specifically, when the tackifier in the rubber material formula is SL-T421, the weight proportion of SL-T421 is 1-2 parts. For example, the weight proportion of SL-T421 can be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2 parts.

[0087] In practical applications, the first reinforcing agent at least includes a reinforcing resin. Specifically, the first reinforcing agent may be a reinforcing resin, or the first reinforcing agent may be a reinforcing resin and short fibers, in which case the short fibers are dispersed in the reinforcing resin, wherein the reinforcing resin may include SL-2101, etc., and wherein the short fibers may include aramid fibers, carbon fibers, polyester fibers, glass fibers, etc., thereby the hardness, modulus, etc. of the rubber material may be increased by the first reinforcing agent.

[0088] It should be noted that the short fibers here refer to fibers with a length of less than or equal to 5 mm.

[0089] Specifically, when the reinforcing resin in the rubber material formula is SL-2101 and the short fiber is aramid fiber, the weight of SL-2101 is 1-10 parts, and SL-2101 can be 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 parts by weight, etc.; the weight of aramid fiber is 0-5 parts, and aramid fiber can be 0, 1, 2, 3, 4 or 5 parts by weight, etc. It should be noted that when the weight of aramid fiber is 0 parts, short fiber is not used in the first reinforcing agent.

[0090] The above-mentioned methylene donor can react with the reinforcing resin in the first reinforcing agent and the white carbon black in the second reinforcing agent to form a methylene-white bonding system, so that during vulcanization, it can react with the copper-plated layer of the copper-plated steel rod in the high-modulus non-elastic body of the shear layer to form a bond, or react with the surface-treated glass fiber in the high-modulus non-elastic body of the shear layer to form a bond, thereby greatly increasing the bonding strength with the steel rod, glass fiber, etc. in the high-modulus non-elastic body of the shear layer. The methylene donor can include HEXA-80, etc.

[0091] Specifically, when the methylene donor in the rubber material formula is HEXA-80, the weight percentage of HEXA-80 is 0-1 part, and for example, the weight percentage of HEXA-80 can be 0 part, 0.2 part, 0.4 part, 0.6 part, 0.8 part or 1 part, etc. It should be noted that when the weight percentage of HEXA-80 is 0 part, that is, no methylene donor is used in the rubber material.

[0092] The above-mentioned bonding aids may include cobalt salts, etc. The bonding aids can promote adhesion. Specifically, when the bonding aid is a cobalt salt, the divalent cobalt ions in the organic cobalt salt can promote the formation of active cuprous sulfide, and can promote the bonding reaction between the meta-methyl white bonding system and the copper-plated steel wire, that is, promote the bonding between rubber and non-elastic materials, especially copper-plated steel wire.

[0093] Specifically, when the adhesive aid in the rubber material formula is a cobalt salt, the cobalt salt is calculated by weight as 0.5-0.8 parts. Exemplarily, the cobalt salt can be calculated by weight as 0.5 parts, 0.55 parts, 0.6 parts, 0.65 parts, 0.7 parts, 0.75 parts or 0.8 parts.

[0094] Therefore, the combination of white carbon black, cobalt salt, SL-2101 and HEXA-80 can increase the adhesion with the high modulus non-elastic material in the shear layer, and indirectly improve the modulus of elongation of the rubber material.

[0095] In practical applications, the plasticizer can reduce the Mooney of the reaction system and reduce the cost, wherein the plasticizer can include cyclohexane oil and the like.

[0096] Specifically, when the plasticizer in the rubber material formula is naphthenic oil, the naphthenic oil is calculated by weight as 0-4 parts, and illustratively, the naphthenic oil can be calculated by weight as 0 parts, 1 parts, 2 parts, 3 parts or 4 parts, etc. It should be noted that when the naphthenic oil is calculated by weight as 0 parts, no plasticizer is used in the rubber material.

[0097] In practical applications, the above-mentioned vulcanizing agent can generate and promote the acceleration of cross-linking vulcanization in the reaction system, wherein the vulcanizing agent can include sulfur and the like.

[0098] Specifically, when the vulcanizing agent in the rubber material formula is sulfur, the sulfur is calculated by weight: 2-6.5 parts. Exemplarily, the sulfur can be calculated by weight 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts or 6.5 parts.

[0099] In practical applications, the above-mentioned accelerator can promote the acceleration of cross-linking vulcanization in the reaction system, wherein the accelerator can include one or more combinations of N-tert-butyl-2-benzene (NS), N-cyclohexyl-2-benzothiazolesulfonamide (CZ), 4,4′-dithiodimorpholine (DTDM), dipropylene glycol (DPG), etc.

[0100] Specifically, when the accelerator in the rubber material formula is NS, CZ, DTDM, or DPG, the weight percentage of NS is 1-2.5 parts. For example, the weight percentage of NS can be 1 part, 1.3 parts, 1.5 parts, 1.8 parts, 2 parts, or 2.5 parts, etc.; the weight percentage of CZ is 2-6.5 parts. For example, the weight percentage of CZ can be 1 part, 1.3 parts, 1.5 parts, 1.8 parts, 2 parts, or 2.5 parts, etc. DTDM is calculated by weight as 1-2.5 parts. For example, DTDM can be 1 part, 1.3 parts, 1.5 parts, 1.8 parts, 2 parts or 2.5 parts, etc.; DPG is calculated by weight as 0.2-0.8 parts. For example, DPG can be 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts or 0.8 parts, etc.

[0101] In practical applications, the scorch retarder can prolong the scorch time of the rubber material, wherein the scorch retarder can include N-cyclohexylthiophthalimide (CTP) and the like.

[0102] Specifically, when the anti-scorch agent in the rubber material formula is CTP, the weight percentage of CTP is: 0-0.5 parts. For example, the weight percentage of CTP can be 0 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts or 0.5 parts, etc. It should be noted that when the weight percentage of CTP is 0 parts, the anti-scorch agent is not used in the rubber material.

[0103] Therefore, the embodiment of the present application produces a rubber material through the above formula, and the 10% elongation modulus of the rubber material ranges from 11 to 30 MPa. Exemplarily, the 10% elongation modulus of the rubber material can be 11 MPa, 15 MPa, 20 MPa, 23 MPa, 28 MPa or 30 MPa, etc.

[0104] It should be noted that the shear layer of a non-pneumatic tire is composed of rubber material and glass fiber rods, steel rods or other non-elastic materials with a modulus much higher than that of rubber material. Figure 1 As shown, the tread of the non-pneumatic tire includes a shear layer, which includes a rubber material and a high-rigidity non-elastic material. The rubber material covers the non-elastic material and is used to react with the non-elastic material during vulcanization. Since the elongation at break of the non-elastic material in the shear layer generally does not exceed 10%, excessive deformation of the shear layer will cause the non-elastic material to fail, so examining the value of the 10% modulus of elongation of the rubber material can better reflect the actual load-bearing capacity of the shear layer.

[0105] The bottom temperature rise of the rubber material due to compression heat generation is less than or equal to 20°C. For example, the bottom temperature rise of the rubber material due to compression heat generation may be 10°C, 12°C, 14°C, 16°C, 18°C ​​or 20°C.

[0106] The tensile strength of the rubber material is in the range of 25-27 MPa. For example, the tensile strength of the rubber material may be 25 MPa, 25.5 MPa, 26 MPa, 26.5 MPa or 30 MPa.

[0107] The elongation of the rubber material ranges from 300% to 500%. For example, the elongation of the rubber material may be 300%, 350%, 400%, 450%, 480% or 500%.

[0108] The embodiment of the present application provides a rubber material, which adopts a reinforcement system mainly composed of white carbon black and undergoes a joint chemical reaction with a silane coupling agent and a cross-linking aid, and the cross-linking aid can also produce a chemical reaction with the raw rubber to increase the 10% modulus of elongation of the vulcanized rubber, while also reducing compression heat generation, thereby slowing down the thermal aging of the rubber material, meeting the material requirements of the shear layer of a non-pneumatic tire, and ensuring the load-bearing capacity and durability of the non-pneumatic tire.

[0109] On the basis of the above, the higher the 10% modulus of elongation of the rubber material provided in the embodiment of the present application, the greater the shear layer bearing capacity, the lower the compression heat generation, and the better the durability of the rubber material.

[0110] Second, combining Figure 1 and Figure 2 An embodiment of the present application provides a non-pneumatic tire, which includes a tread, an adhesive layer, a plurality of spokes and a hub, wherein the plurality of spokes constitute a wheel spoke, one end of the wheel spoke is connected to the tread through the adhesive layer, and the other end of the wheel spoke is connected to the hub.

[0111] The tread comprises a tread crown and at least one shear layer, wherein the tread crown covers all the shear layers, and the shear layers comprise a non-elastic material and the above-mentioned rubber material, wherein the rubber material covers the non-elastic material and is used to react with the non-elastic material during vulcanization.

[0112] An embodiment of the present application provides a non-pneumatic tire. By setting the material of the shear layer to the above-mentioned formula, the load-bearing capacity and durability of the non-pneumatic tire can be improved due to the high 10% modulus of elongation and low compression heat generation of the rubber material.

[0113] In a third aspect, an embodiment of the present application provides a method for preparing the above-mentioned rubber material.

[0114] like Figure 3 As shown, the preparation method of the rubber material comprises the following steps:

[0115] S1, plasticizing and mixing the raw rubber to obtain processed raw rubber.

[0116] S2. After the treated raw rubber is pressed and lifted, the first reinforcing agent, the second reinforcing agent, the activator, the antioxidant, the tackifier, the adhesive aid, the plasticizer and the coupling agent are added and mixed evenly, and the plug is pressed or the fuel is added after heating, and then the plug is pressed, the plug is lifted, the plug is pressed and the glue is discharged after heating to obtain a masterbatch.

[0117] S3, a section of masterbatch is pressed for a period of time, a vulcanizing agent, an accelerator, a cross-linking aid, a methylene donor and a scorch retarder are added, and the masterbatch is repeatedly lifted and pressurized before the masterbatch is discharged to obtain a rubber material.

[0118] Furthermore, if Figure 4 As shown, after the above step S2, the treated raw rubber is subjected to bolt pressing and bolt lifting, the first reinforcing agent, the second reinforcing agent, the activator, the antioxidant, the tackifier, the adhesive aid, the plasticizer and the coupling agent are added and mixed evenly, the bolt is pressed or the temperature is increased and the fuel is added, and then the bolt is pressed, the bolt is lifted, the bolt is pressed and the glue is discharged after heating to obtain a masterbatch, and step S3, a masterbatch is pressed for a period of time, a vulcanizer, an accelerator, a cross-linking aid, a methylene donor and a scorch retarder are added, and the bolt is repeatedly lifted and pressurized and the glue is discharged to obtain the rubber material, the preparation method of the rubber material also includes:

[0119] S4, the first stage of the masterbatch is pressed and heated to discharge the masterbatch to obtain the second stage of the masterbatch.

[0120] At this time, step S3, a section of masterbatch is pressed for a period of time, a vulcanizing agent, an accelerator, a cross-linking aid, a methylene donor and a scorch retarder are added, and the masterbatch is repeatedly lifted and pressurized before the rubber is discharged to obtain a rubber material including:

[0121] S31, the second stage master rubber is pressed for a period of time, a vulcanizing agent, an accelerator, a cross-linking aid, a methylene donor and a scorch retarder are added, and the rubber is discharged after repeatedly lifting the plug and pressurizing to obtain a rubber material.

[0122] Therefore, the two-stage process can further reduce the Mooney viscosity of the rubber material, thereby improving the performance of the rubber material.

[0123] It should be noted that the embodiments of the present application are mixed by a banburying mixing process. It should be noted that the banburying temperature needs to reach 140-150° C. and be maintained for 1 minute before the rubber is discharged to achieve the coupling reaction conditions of the silane in the mixed rubber.

[0124] In addition, the descriptions of the raw rubber, activator, antioxidant, tackifier, adhesive aid, plasticizer, first reinforcing agent, second reinforcing agent, coupling agent, vulcanizing agent, accelerator, cross-linking aid, methylene donor and scorch retardant in the embodiments of the present application can refer to the above embodiments and will not be repeated here.

[0125] like Figure 5 As shown, a specific preparation process of the rubber material of an embodiment of the present application is provided below:

[0126] S11. Put raw rubber into a 6-inch open mixer and a 350ML internal mixer for plasticizing and mixing. Preheat the internal mixer to 60° C. to obtain treated raw rubber.

[0127] In practical applications, preheating the internal mixer to 60°C helps the rubber compound to heat up quickly, thereby improving efficiency.

[0128] S12, one-stage process: set the speed of the internal mixer to 40-60rpm, press the bolt for 50-70s and lift the bolt after treatment, and add the first reinforcing agent, the second reinforcing agent, the activator, the antioxidant, the tackifier, the adhesive additive, the plasticizer and the coupling agent, and at the same time reduce the speed of the internal mixer to 30-50rpm, press the bolt for 60s or raise the temperature of the internal mixer to 100-120℃ and add oil, press the bolt for 50-70s and lift the bolt, press the bolt again to 140-160℃ and discharge the rubber to obtain a masterbatch.

[0129] It should be noted that when the temperature of the internal mixer reaches between 140-150°C, the time needs to be maintained for 60-90s. This temperature and time can complete the silane coupling reaction between the second reinforcing agent and the coupling agent, allowing the second reinforcing agent to play a better reinforcing role and play its role.

[0130] S13, final mixing process: adjust the speed of the internal mixer to 10-30rpm, press the plug of a section of masterbatch for 20-40s, add vulcanizing agent, accelerator, cross-linking aid, methylene donor and anti-scorch agent, repeatedly lift the plug and pressurize to obtain the rubber material.

[0131] It should be noted that in the final refining process, if the debonding temperature is higher than 100°C, there may be risks of early vulcanization and scorching. Therefore, the debonding temperature in the final refining process is set to be less than or equal to 100°C.

[0132] like Figure 6 As shown, the specific preparation process of the rubber material of another embodiment of the present application is provided below:

[0133] S11. Put raw rubber into a 6-inch open mixer and a 350ML internal mixer for plasticizing and mixing. Preheat the internal mixer to 60° C. to obtain treated raw rubber.

[0134] S12, one-stage process: set the speed of the internal mixer to 40-60rpm, press the bolt for 50-70s and lift the bolt after treatment, and add the first reinforcing agent, the second reinforcing agent, the activator, the antioxidant, the tackifier, the adhesive additive, the plasticizer and the coupling agent, and at the same time reduce the speed of the internal mixer to 30-50rpm, press the bolt for 60s or raise the temperature of the internal mixer to 100-120℃ and add oil, press the bolt for 50-70s and lift the bolt, press the bolt again to 140-160℃ and discharge the rubber to obtain a masterbatch.

[0135] S23, two-stage process: the first-stage masterbatch is pressed until the temperature reaches 140-160°C to discharge the glue, and the second-stage masterbatch is obtained.

[0136] In practical applications, the two-stage process can reduce the Mooney viscosity of the rubber, etc.

[0137] S24, final mixing process: adjust the speed of the internal mixer to 10-30rpm, press the plug of the second-stage masterbatch for 20-40s, add vulcanizing agent, accelerator, cross-linking aid, methylene donor and anti-scorch agent, repeatedly lift the plug and pressurize to obtain the rubber material.

[0138] The following is a description of the rubber materials and preparation methods and applications of the embodiments and comparative examples of the present application through a number of specific embodiments.

[0139] Example 1

[0140] 1. Rubber material formula:

[0141] Natural rubber, 100 parts; zinc oxide + stearic acid, 4 parts + 0.75 parts; RD, 2 parts; SL-T421, 1 part; cobalt salt, 0.5 parts; cyclohexane oil, 1 part; SL-2101, 2 parts; LK975MP + N330, 43 parts + 7 parts; silicon-69, 4 parts; sulfur, 4 parts; NS, 2.2 parts; H9, 2 parts; HEXA-80, 0.1 parts; CTP, 0.1 parts.

[0142] 2. Rubber material preparation method:

[0143] (1) Natural rubber was put into a 6-inch open mixer and a 350ML internal mixer for plasticizing and mixing. The internal mixer was preheated to 60°C to obtain the treated natural rubber.

[0144] (2) Set the speed of the internal mixer to 50 rpm, press the bolt for 60 seconds and then lift the bolt after treatment. Then add SL-2101, LK975MP, N330, zinc oxide, stearic acid, RD, SL-T421, cobalt salt, cyclohexane oil and silicon-69. Then reduce the speed of the internal mixer to 40 rpm, press the bolt for 60 seconds or raise the temperature of the internal mixer to 110°C and add fuel. Press the bolt for 60 seconds and then lift the bolt. Press the bolt again to 150°C and discharge the rubber to obtain a masterbatch.

[0145] (3) The first stage masterbatch is pressed until the temperature reaches 150°C to discharge the glue, thereby obtaining the second stage masterbatch.

[0146] (4) The speed of the internal mixer was adjusted to 20 rpm, the second-stage masterbatch was pressed for 30 seconds, sulfur, NS, H9, HEXA-80 and CTP were added, and the plug was repeatedly lifted and pressurized to obtain the rubber material.

[0147] Example 2

[0148] 1. Rubber material formula:

[0149] Natural rubber + styrene-butadiene rubber, 90 parts + 10 parts; stearic acid, 3 parts; 4020, 1 part; SL-T421, 1.5 parts; cobalt salt, 0.6 parts; cyclohexane oil, 3 parts; SL-2101 + aramid fiber, 4 parts + 1 part; LK975MP, 50 parts; silicon-69, 3 parts; sulfur, 2.5 parts; DTDM, 2.5 parts; WY9188, 3 parts; HEXA-80, 0.5 parts; CTP, 0.3 parts.

[0150] 2. Rubber material preparation method:

[0151] (1) Add natural rubber and styrene-butadiene rubber into a 6-inch open mixer and a 350ML internal mixer for plasticizing and mixing. Preheat the internal mixer to 60°C to obtain the treated raw rubber.

[0152] (2) Set the speed of the internal mixer to 50 rpm, press the plug for 60 seconds and then lift the plug after treatment, and add SL-2101, LK975MP, stearic acid, 4020, SL-T421, cobalt salt, cyclohexane oil and silicon-69. Then reduce the speed of the internal mixer to 40 rpm, press the plug for 60 seconds or raise the temperature of the internal mixer to 110 °C and add oil, press the plug for 60 seconds and then lift the plug, press the plug again to 150 °C to discharge the rubber, and obtain a masterbatch.

[0153] (3) The first stage masterbatch is pressed until the temperature reaches 150°C to discharge the glue, thereby obtaining the second stage masterbatch.

[0154] (4) The speed of the internal mixer was adjusted to 20 rpm, the second-stage masterbatch was pressed for 30 seconds, sulfur, DTDM, WY9188, HEXA-80 and CTP were added, and the plug was repeatedly lifted and pressurized to obtain the rubber material.

[0155] Example 3

[0156] 1. Rubber material formula:

[0157] Natural rubber + styrene-butadiene rubber + butadiene rubber, 80 parts + 10 parts + 10 parts; zinc oxide, 8 parts; 4010NA, 2 parts; SL-T421, 2 parts; cobalt salt, 0.8 parts; cyclohexane oil, 4 parts; SL-2101, 10 parts; CSHD160+N660, 45 parts + 5 parts; silicon-69, 5 parts; sulfur, 6.5 parts; DPG, 0.8 parts; CSC920, 5 parts; HEXA-80, 1 part; CTP, 0.5 parts.

[0158] 2. Rubber material preparation method:

[0159] (1) Natural rubber, styrene-butadiene rubber and butadiene rubber are put into a 6-inch open mixer and a 350-ml internal mixer for plasticizing and mixing. The internal mixer is preheated to 60°C to obtain the treated raw rubber.

[0160] (2) Set the speed of the internal mixer to 50 rpm, press the plug for 60 seconds and then lift the plug after treatment, and add SL-2101, CSHD160, N660, zinc oxide, 4010NA, SL-T421, cobalt salt, cyclohexane oil and silicon-69. Then reduce the speed of the internal mixer to 40 rpm, press the plug for 60 seconds or raise the temperature of the internal mixer to 110 °C and add oil, press the plug for 60 seconds and then lift the plug, press the plug again to 150 °C to discharge the rubber, and obtain a masterbatch.

[0161] (3) The first stage masterbatch is pressed until the temperature reaches 150°C to discharge the glue, thereby obtaining the second stage masterbatch.

[0162] (4) The speed of the internal mixer was adjusted to 20 rpm, the second-stage masterbatch was pressed for 30 seconds, sulfur, DPG, CSC920, HEXA-80 and CTP were added, and the plug was repeatedly lifted and pressurized to obtain the rubber material.

[0163] Comparative Example 1

[0164] A commercially available rubber material for a pneumatic tire belt was used.

[0165] The rubber materials obtained in Examples 1-3 and Comparative Example 1 were tested for scorch time (TC10), vulcanization time (TC90), Mooney viscosity, Mooney scorch, room-temperature Shore hardness, density, tensile strength, elongation, 10% tensile strength at modulus, 25% tensile strength at modulus, 50% tensile strength at modulus, 100% tensile strength at modulus, 300% tensile strength at modulus, crescent tear strength (cut), compression heat generation and static compression set rate. The results are shown in Table 1 below.

[0166] Among them, the test methods for TC10 and TC90 are both GB / T16584, the testing equipment is both rheometer, and the test conditions (vulcanization conditions) are both 150°C and 60min.

[0167] The test method for Mooney viscosity is GB / T1232, the testing equipment is Mooney viscometer, and the test conditions (vulcanization conditions) are ML100℃1+4.

[0168] The test method for Mooney scorch is GB / T1232, the testing equipment is Mooney viscometer, and the test conditions (vulcanization conditions) are 125℃T5.

[0169] The test method for Shore hardness at room temperature is GB / T531, the testing equipment is a hardness tester, and the test conditions (vulcanization conditions) are 150℃ and 30min.

[0170] The test methods for density, tensile strength, elongation, 10% tensile strength at modulus, 25% tensile strength at modulus, 50% tensile strength at modulus, 100% tensile strength at modulus and 300% tensile strength at modulus are all in accordance with GB / T528. The testing equipment is all tensile testing machine, and the testing conditions (vulcanization conditions) are all 150°C and 30min.

[0171] The test method for crescent tear strength (cut) is GB / T529, the testing equipment is a tensile testing machine, and the testing conditions (vulcanization conditions) are 150°C and 30min.

[0172] The test method for compression heat generation is GB1687.3-2016 bottom temperature rise, the detection equipment is a dynamic compression heat generation test machine, and the test conditions (vulcanization conditions) are 150°C and 30min.

[0173] The test method for static compression deformation rate is GB1687.3-2016, the testing equipment is a dynamic compression heat generation testing machine, and the test conditions (vulcanization conditions) are 150°C and 30min.

[0174] Table 1

[0175]

[0176] It can be seen from Table 1 that, compared with Comparative Example 1, under the condition of the same hardness, the rubber materials provided by Examples 1-3 of the present application have a higher modulus at constant tensile strength (the modulus at constant tensile strength is in a linear positive proportional relationship), and lower compression heat generation, that is, better heat generation performance.

[0177] Figure 7 This is the tensile performance test result of the rubber material of Comparative Example 1. Figure 8 This is the tensile performance test result of the rubber material prepared in Example 1 of the present application. Figure 7 and Figure 8 In the figure, the horizontal axis represents the elongation distance (the initial distance is 25 mm), the unit is millimeter (mm), and the vertical axis represents the force value, the unit is Newton (N).

[0178] like Figure 7 and Figure 8 As shown, under the condition of the same elongation distance, the force value of Example 1 of the present application is higher than that of Comparative Example 1, that is, the modulus of elongation is higher.

[0179] This application only introduces the contents related to the invention. The remaining structures can be obtained by referring to the relevant technologies and will not be described in detail here.

[0180] An “embodiment” referred to herein means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application.

[0181] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A rubber material, characterized in that: The parts by weight include: Raw rubber, 100 parts; Activator, 4.75-11 parts; Anti-aging agent, 2-4 parts; Thickener, 1-2 parts; Adhesive additive, 0.5-0.8 parts; Plasticizer, 0-4 parts; First reinforcing agent, 1-10 parts; Second reinforcing agent, 45-60 parts; Coupling agent, 2-5 parts; Vulcanizing agent, 2-6.5 parts; Accelerator, 2.2-5.8 parts; Cross-linking aid, 2-5 parts; Methylene donor, 0-1 part; Anti-scorch agent, 0-0.5 parts.

2. The rubber material according to claim 1, characterized in that: The raw rubber at least includes natural rubber, and the proportion of the natural rubber in the raw rubber is greater than or equal to 50%.

3. The rubber material according to claim 1 or 2, characterized in that: The reinforcing agent includes at least white carbon black.

4. The rubber material according to claim 3, characterized in that: The reinforcing agent also includes carbon black; The proportion of white carbon black to the reinforcing agent is in the range of 40-50%; The carbon black accounts for 5-10% of the reinforcing agent.

5. The rubber material according to claim 1, characterized in that: The coupling agent includes a silane coupling agent.

6. The rubber material according to claim 1, characterized in that: The cross-linking auxiliary agent includes at least one of isophthalic acid hydrazide, 1,6-bis(N,N'-dibenzothiazolecarbamoyl disulfide)-hexane, 1,6-bis(N,N-dibenzylthiocarbamoyl disulfide) hexane, and unsaturated amino derivative compounds.

7. The rubber material according to claim 1, characterized in that: The 10% modulus of elongation of the rubber material is in the range of 11-30 MPa; and / or, The compression heat generation of the rubber material is less than or equal to 20°C.

8. The rubber material according to claim 1, characterized in that: The tensile strength of the rubber material is in the range of 25-27 MPa; and / or, The elongation of the rubber material ranges from 300 to 500%; and / or, The static compression deformation rate of the rubber material is in the range of 8-12%; and / or, The crescent tear strength of the rubber material is in the range of 100-110 kN / m; and / or, The density of the rubber material is in the range of 1.10-1.20 g / cm 3 .

9. A non-pneumatic tire, characterized in that: At least comprising a tread, the tread comprising a tread cap and at least one shear layer, the tread cap enveloping all the shear layers; The shear layer comprises a non-elastic material and a rubber material according to any one of claims 1 to 8, wherein the rubber material covers the non-elastic material and is used to react with the non-elastic material during vulcanization.

10. A method for preparing a rubber material according to any one of claims 1 to 8, characterized in that: The steps include: The raw rubber is plasticized and compounded to obtain processed raw rubber; After the treated raw rubber is subjected to bolt pressing and bolt lifting, the first reinforcing agent, the second reinforcing agent, the activator, the antioxidant, the tackifier, the adhesive aid, the plasticizer and the coupling agent are added and mixed evenly, and the bolt is pressed or the fuel is added after heating, and then the bolt is pressed, the bolt is lifted, the bolt is pressed and the glue is discharged after heating, so as to obtain a masterbatch; The masterbatch is pressed for a period of time, the vulcanizing agent, the accelerator, the crosslinking aid, the methylene donor and the anti-scorch agent are added, and the masterbatch is repeatedly lifted and pressurized before the masterbatch is discharged to obtain the rubber material.

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