Tear-resistant heavy truck engine suspension rubber material and preparation method thereof

Abstract

The invention relates to the technical field of rubber material preparation, in particular to a tear-resistant heavy truck engine suspension rubber material and a preparation method thereof. The tear-resistant heavy truck engine suspension rubber material is prepared from the following raw materials in parts by weight: 75 to 90 parts of natural rubber, 15 to 25 parts of butadiene styrene rubber, 8 to 20 parts of reinforced fibers, 12 to 25 parts of carbon black, 3 to 8 parts of an activating agent, 1.5 to 4 parts of an anti-aging agent, 2 to 4 parts of microcrystalline wax, 1.5 to 3.5 parts of an accelerant, 1 to 3 parts of a tackifier, 1 to 3 parts of a dispersing agent, 0.5 to 1.5 parts of sulfur and 0.5 to 1.5 parts of a silane coupling agent. The rubber material provided by the invention has excellent tear resistance, is suitable for heavy trucks and other high-load environments, has good aging resistance, ensures the long service life of the material, and is simple and feasible in preparation method, low in cost and easy to realize large-scale production.

Description

Technical Field

[0001] The invention relates to the technical field of rubber material preparation, and in particular to a tear-resistant heavy truck engine suspension rubber material and a preparation method thereof. Background Art

[0002] Heavy trucks often travel on complex roads, and their engines are subject to large vibrations and impacts. This not only affects the stability and ride comfort of the vehicle, but may also cause damage to the engine suspension system. Traditional rubber materials currently used on the market are prone to aging, wear and tear when subjected to high-intensity vibrations for a long time, thereby reducing the safety performance and service life of the vehicle. Therefore, the development of a new rubber material with excellent tear resistance has become the key to improving the reliability of heavy truck engine suspension systems. Summary of the invention

[0003] Based on this, it is necessary to provide a tear-resistant heavy truck engine suspension rubber material and a preparation method thereof. The present application optimizes the material formula and preparation process, and the prepared rubber material can not only maintain good elasticity and shock absorption effect, but also greatly improve the tear resistance and effectively extend the service life.

[0004] In a first aspect of the present application, a tear-resistant heavy-duty truck engine suspension rubber material is provided, comprising the following raw materials by weight:

[0005] Natural rubber 75~90 parts,

[0006] 15 to 25 parts of styrene-butadiene rubber,

[0007] Reinforced fiber 8~20 parts,

[0008] Carbon black 12~25 parts,

[0009] 3 to 8 parts of activator,

[0010] 1.5 to 4 parts of antioxidant

[0011] 2~4 parts of microcrystalline wax,

[0012] Accelerator 1.5~3.5 parts,

[0013] 1~3 parts of tackifier,

[0014] Dispersant 1~3 parts,

[0015] 0.5~1.5 parts of sulfur,

[0016] Silane coupling agent 0.5~1.5 parts.

[0017] In one embodiment, the tear-resistant heavy-duty truck engine suspension rubber material comprises the following raw materials in parts by weight:

[0018] 80~90 parts of natural rubber,

[0019] 15 to 25 parts of styrene-butadiene rubber,

[0020] Reinforcement fiber 10~20 parts,

[0021] Carbon black 15~25 parts,

[0022] 3~5 parts of activator,

[0023] 1.5 to 3 parts of antioxidant

[0024] 3~4 parts of microcrystalline wax,

[0025] 2~3 parts of accelerator,

[0026] 1~2 parts of thickener,

[0027] Dispersant 1~2 parts,

[0028] 0.5~1.5 parts of sulfur,

[0029] Silane coupling agent 0.5~1.5 parts.

[0030] In one embodiment, the mass ratio of the natural rubber to the styrene-butadiene rubber is 3.2-6:1.

[0031] In one embodiment, the reinforcing fiber satisfies at least one of the following conditions (1) to (4):

[0032] (1) The reinforcing fiber is a polyarylate fiber;

[0033] (2) The reinforcing fiber is a liquid crystal polymer fiber;

[0034] (3) The length of the reinforcing fiber is 0.2~1mm; the density is 1.20 g / cm 3 ~1.70g / cm 3 , moisture absorption rate is 0.02%~0.06%;

[0035] (4) The reinforcing fiber includes at least one of Sumitomo's E5204L, Sumitomo's E4008, Celanese's VECTRA A950, and Kingfa's Vicryst R830.

[0036] In one embodiment, the activator includes at least one of zinc oxide and magnesium oxide; the antioxidant includes at least one of antioxidant 4010NA and antioxidant RD.

[0037] In one embodiment, the accelerator is obtained by mixing CBS and DTDM; the mass ratio of the CBS to the DTDM is 1-1.5: 1. The tackifier includes at least one of coumarone resin and modified phenolic resin.

[0038] In one embodiment, the dispersant includes at least one of ethylene bisstearamide and dispersant KT-8A; the silane coupling agent includes at least one of A-1120 and QX-618.

[0039] The second aspect of the present application provides a method for preparing the tear-resistant heavy-duty truck engine suspension rubber material of the first aspect, comprising the following steps:

[0040] S1: Mix and soak the reinforcing fiber and the silane coupling agent, and irradiate with ultraviolet light to obtain pretreated reinforcing fiber for later use.

[0041] S2: Natural rubber and styrene-butadiene rubber are mixed and kneaded to obtain a raw rubber material, and then the pretreated reinforcing fiber is added. After heating and kneading, carbon black, activator, antioxidant, microcrystalline wax, tackifier, dispersant are added, and the mixture is kneaded at a heat-insulating temperature to obtain an intermediate mixed rubber material.

[0042] S3: The intermediate rubber mix is ​​cooled to room temperature, allowed to stand, and then added to an internal mixer, and sulfur and an accelerator are added and mixed to obtain a rubber mix.

[0043] S4: The mixed rubber is injection molded to obtain a tear-resistant heavy-duty truck engine suspension rubber material.

[0044] In one of the embodiments, in S1, the soaking time is 10min~20min, and the ultraviolet irradiation time is 5min~10min; in S2, the mixing and kneading time is 30s~50s; heating mixing refers to heating to 120℃~140℃ and kneading for 15s~30s; heat preservation and internal kneading refers to kneading at 120℃~140℃ for 10min~18min.

[0045] In one embodiment, in S3, the standing time is 6h~12h; the mixing temperature is 95℃~115℃, and the time is 2min~4min; in S4, the injection molding is injecting the mixed rubber into a 150℃~170℃ molding mold through an injection molding device, maintaining a pressure of 8MPa~10MPa, and vulcanizing for 5min~10min; or injecting the mixed rubber into a molding mold at 130℃~150℃ through an injection molding device, maintaining a pressure of 8MPa~10MPa, and vulcanizing for 6min~12min.

[0046] The present application limits the raw materials and mass fractions of each preparation within a specific range, and utilizes the coordination and synergistic effect between the raw materials. Specifically: natural rubber and styrene-butadiene rubber are mixed to obtain a raw rubber material, which is then mixed with other components, thereby avoiding the uneven distribution of rubber and the generation of tear points due to local mechanical property differences; carbon black plays a filling and reinforcing role in rubber, improving the tensile strength and tear strength of rubber, while improving the wear resistance and weather resistance of rubber; activators can promote the interaction between rubber and fillers (such as carbon black), improve the dispersion of fillers and the cross-linking density of rubber; antioxidants can effectively inhibit oxidation, heat aging and light aging of rubber during processing, storage and use, and extend the service life of rubber products; microcrystalline wax can migrate to the surface of rubber products to form a protective film to prevent Products are damaged by environmental factors such as ozone and ultraviolet rays; accelerators can accelerate the vulcanization process of rubber, improve vulcanization efficiency and the performance of vulcanized rubber; tackifiers can improve the adhesion between rubber and other materials (such as fibers, metals, etc.), and enhance the bonding properties of rubber products; dispersants can improve the dispersion of fillers in rubber, improve the utilization rate of fillers and the cross-linking density of rubber; sulfur is the main cross-linking agent in the rubber vulcanization process, and can react chemically with rubber molecular chains to form a cross-linked network structure; silane coupling agents can improve the interfacial bonding between fibers and rubber and inorganic fillers; the added reinforcing fibers form a network structure similar to the cross-linking of rubber molecules when evenly mixed in the rubber, which can effectively prevent the expansion of rubber microcracks, and further improve the tear strength of rubber materials.

[0047] The rubber material prepared in the present application has excellent tear resistance and is suitable for high-load environments such as heavy trucks. It also has good aging resistance to ensure the long life of the material. The preparation method is simple and easy, low-cost, and easy to achieve large-scale production. DETAILED DESCRIPTION

[0048] References to embodiments of the present application will now be provided in detail, one or more embodiments of which are described below. Each embodiment is provided as an explanation rather than a limitation of the present application. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the present application without departing from the scope or spirit of the present application. For example, a feature described or described as part of one embodiment may be used in another embodiment to produce a further embodiment.

[0049] Therefore, it is intended that the present application covers such modifications and variations that fall within the scope of the appended claims and their equivalents. Other objects, features and aspects of the present application are disclosed in or are apparent from the following detailed description. It will be appreciated by those of ordinary skill in the art that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the present application.

[0050] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0051] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0052] In this article, when referring to the unit of a data range, if there is a unit only after the right endpoint, it means that the units of the left and right endpoints are the same. For example, 100~150 s means that the units of the left endpoint "100" and the right endpoint "150" are both s (seconds).

[0053] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0054] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0055] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, mentioning that the method may also include step (c) means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0056] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0057] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0058] In view of the problems that heavy-duty truck engine suspension rubber materials in traditional technology are prone to aging, wear, and tearing under high-intensity vibration, this application proposes a tear-resistant heavy-duty truck engine suspension rubber material to solve the above-mentioned technical problems existing in traditional heavy-duty truck engine suspension rubber materials.

[0059] The first aspect of the present application provides a tear-resistant heavy-duty truck engine suspension rubber material, comprising the following raw materials by weight:

[0060] Natural rubber 75~90 parts,

[0061] 15 to 25 parts of styrene-butadiene rubber,

[0062] Reinforced fiber 8~20 parts,

[0063] Carbon black 12~25 parts,

[0064] 3 to 8 parts of activator,

[0065] 1.5 to 4 parts of antioxidant

[0066] 2~4 parts of microcrystalline wax,

[0067] Accelerator 1.5~3.5 parts,

[0068] 1~3 parts of tackifier,

[0069] Dispersant 1~3 parts,

[0070] 0.5~1.5 parts of sulfur,

[0071] Silane coupling agent 0.5~1.5 parts.

[0072] In some embodiments, the tear-resistant heavy-duty truck engine suspension rubber material includes the following preparation raw materials in parts by weight:

[0073] 80~90 parts of natural rubber,

[0074] 15 to 25 parts of styrene-butadiene rubber,

[0075] Reinforcement fiber 10~20 parts,

[0076] Carbon black 15~25 parts,

[0077] 3~5 parts of activator,

[0078] 1.5 to 3 parts of antioxidant

[0079] 3~4 parts of microcrystalline wax,

[0080] 2~3 parts of accelerator,

[0081] 1~2 parts of thickener,

[0082] Dispersant 1~2 parts,

[0083] 0.5~1.5 parts of sulfur,

[0084] Silane coupling agent 0.5~1.5 parts.

[0085] Preferably, the tear-resistant heavy-duty truck engine suspension rubber material includes the following raw materials, by weight: 90 parts of natural rubber, 15 parts of styrene-butadiene rubber, 20 parts of reinforcing fiber, 15 parts of carbon black, 5 parts of activator, 3 parts of antioxidant, 3 parts of microcrystalline wax, 3 parts of promoter, 1 part of tackifier, 2 parts of dispersant, 1.5 parts of sulfur, and 1.3 parts of silane coupling agent.

[0086] The present application limits the raw materials and mass fractions of each preparation within a specific range, and utilizes the coordination and synergistic effect between the raw materials. Specifically: natural rubber and styrene-butadiene rubber are mixed to obtain a raw rubber material, which is then mixed with other components, thereby avoiding the uneven distribution of rubber and the generation of tear points due to local mechanical property differences; carbon black plays a filling and reinforcing role in rubber, improving the tensile strength and tear strength of rubber, while improving the wear resistance and weather resistance of rubber; activators can promote the interaction between rubber and fillers (such as carbon black), improve the dispersion of fillers and the cross-linking density of rubber; antioxidants can effectively inhibit oxidation, heat aging and light aging of rubber during processing, storage and use, and extend the service life of rubber products; microcrystalline wax can migrate to the surface of rubber products to form a protective film to prevent Products are damaged by environmental factors such as ozone and ultraviolet rays; accelerators can accelerate the vulcanization process of rubber, improve vulcanization efficiency and the performance of vulcanized rubber; tackifiers can improve the adhesion between rubber and other materials (such as fibers, metals, etc.), and enhance the adhesive properties of rubber products; dispersants can improve the dispersion of fillers in rubber, improve the utilization rate of fillers and the cross-linking density of rubber; sulfur is the main cross-linking agent in the vulcanization process of rubber, and can react chemically with rubber molecular chains to form a cross-linked network structure; silane coupling agents can improve the interfacial bonding between fibers and rubber and inorganic fillers; the added reinforcing fibers form a network structure similar to the cross-linking of rubber molecules when uniformly mixed in the rubber, which can effectively prevent the expansion of rubber microcracks, and further improve the tear strength of rubber materials. The rubber material prepared in this application has excellent tear resistance and is suitable for high-load environments such as heavy trucks. At the same time, it has good aging resistance to ensure the long life of the material, and the preparation method is simple and easy, low cost, and easy to achieve large-scale production.

[0087] In some embodiments, the mass ratio of natural rubber to styrene-butadiene rubber is 3.2 to 6:1, including but not limited to 3.2:1, 4:1, 4.25:1, 4.5:1, 5:1, and 6:1. The present application does not limit the specific parameters of natural rubber and styrene-butadiene rubber, and any limitation that can achieve the effect of the present application is within the protection scope of the present application.

[0088] In some embodiments, the reinforcing fiber satisfies at least one of the following conditions (1) to (4):

[0089] (1) The reinforcing fiber is polyarylate fiber;

[0090] (2) The reinforcing fiber is liquid crystal polymer fiber (LCP fiber);

[0091] (3) The length of the reinforcing fiber is 0.2 mm to 1 mm, including but not limited to 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, and 1 mm; the density is 1.20 g / cm 3~1.70g / cm 3 , moisture absorption rate is 0.02%~0.06%;

[0092] (4) Reinforcement fibers include Sumitomo , Sumitomo's , Celanese's VECTRA A950, Blonde's Vicryst R830 or at least one of them.

[0093] In the present application, LCP fiber belongs to aromatic polyester, which is spun into filaments by a liquid crystal polymer through a melt extrusion process. It has the characteristics of high tension, high elasticity and high strength, good cut resistance, high fatigue resistance, and is not easily damaged even under repeated stress. It has very good vibration absorption characteristics and extremely small linear expansion rate.

[0094] It is understandable that in the present application, the tear resistance mechanism of the liquid crystal polymer fiber reinforced rubber material is: when the rubber material is torn by external force, the crack propagation will cause stress concentration. The addition of liquid crystal polymer fibers can effectively transfer stress from the rubber matrix to itself. Since the liquid crystal polymer fibers have high strength and modulus, and have good cut resistance and fatigue resistance, they can bear greater loads, thereby delaying the expansion of cracks and improving the overall tear resistance of the material. The addition of liquid crystal polymer fibers can change the crack path from straight-line expansion to tortuous or branched. The change in the crack path means that more obstacles need to be overcome and more energy is consumed during the crack propagation process, thereby improving the tear resistance of the material.

[0095] The present application adopts liquid crystal polymer fibers as reinforcing materials, which can effectively prevent the expansion of rubber microcracks and improve the tear strength of rubber materials.

[0096] In some embodiments, the activator includes at least one of zinc oxide and magnesium oxide; the antioxidant includes at least one of antioxidant 4010NA and antioxidant RD.

[0097] In some embodiments, the accelerator is obtained by mixing CBS (N-cyclohexyl-2-benzothiazole sulfenamide) and DTDM (4,4′-dithiodimorpholine); the mass ratio of CBS to DTDM is 1 to 1.5:1, including but not limited to 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, and 1.5:1. The tackifier includes at least one of coumarone resin and modified phenolic resin.

[0098] In some embodiments, the dispersant includes at least one of ethylene bisstearamide and dispersant KT-8A; and the silane coupling agent includes at least one of A-1120 and QX-618.

[0099] The second aspect of the present application provides a method for preparing the tear-resistant heavy-duty truck engine suspension rubber material of the first aspect, comprising the following steps:

[0100] S1: Mix and soak the reinforcing fiber and the silane coupling agent, and irradiate with ultraviolet light to obtain pretreated reinforcing fiber for later use.

[0101] S2: Natural rubber and styrene-butadiene rubber are mixed and kneaded to obtain a raw rubber material, and then the pretreated reinforcing fiber is added. After heating and kneading, carbon black, activator, antioxidant, microcrystalline wax, tackifier, dispersant are added, and the mixture is kneaded at a heat-insulating temperature to obtain an intermediate mixed rubber material.

[0102] S3: The intermediate rubber mix is ​​cooled to room temperature, allowed to stand, and then added to an internal mixer, and sulfur and an accelerator are added and mixed to obtain a rubber mix.

[0103] S4: The mixed rubber is injection molded to obtain a tear-resistant heavy-duty truck engine suspension rubber material.

[0104] In some embodiments, in S1, the soaking time is 10 min to 20 min, including but not limited to 10 min, 12 min, 14 min, 16 min, 18 min, 20 min, and the ultraviolet irradiation time is 5 min to 10 min, including but not limited to 5 min, 6 min, 7 min, 8 min, 9 min, 10 min; in S2, the mixing time is 30 s to 50 s, including but not limited to 30 s, 35 s, 40 s, 45 s, 50 s; heating mixing refers to heating to 120 ° C ~140℃ mixing for 15s~30s, wherein the temperature of heating mixing includes but is not limited to 120℃, 125℃, 130℃, 135℃, 140℃, and the time includes but is not limited to 15s, 20s, 25s, 30s; heat preservation and internal mixing refers to mixing the rubber at 120℃~140℃ for 10min~18min; wherein the temperature of heat preservation and internal mixing includes but is not limited to 120℃, 125℃, 130℃, 135℃, 140℃, and the time includes but is not limited to 10min, 12min, 14min, 16min, 18min.

[0105] In some embodiments, in S3, the standing time is 6h~12h, including but not limited to 6h, 7h, 8h, 9h, 10h, 11h, 12h; the mixing temperature is 95℃~115℃, including but not limited to 95℃, 98℃, 100℃, 112℃, 114℃, 115℃, and the time is 2min~4min, including but not limited to 2min, 2.5min, 3min, 3.5min, 4min.

[0106] In some embodiments, in S4, injection molding is to inject the rubber mix into a molding mold at 150°C to 170°C through an injection molding device, maintain a pressure of 8MPa to 10MPa, including but not limited to 8MPa, 9MPa, and 10MPa, and vulcanize for 5min to 10min, including but not limited to 5min, 6min, 7min, 8min, 9min, and 10min; the temperature of the molding mold includes but is not limited to 150°C, 155°C, 160°C, 165°C, and 170°C. Or, inject the rubber mix into a molding mold at 130°C to 150°C through an injection molding device, maintain a pressure of 8MPa to 10MPa, and vulcanize for 6min to 12min, including but not limited to 6min, 7min, 8min, 9min, 10min, 11min, and 12min; the temperature of the mold includes but is not limited to 130°C, 135°C, 140°C, 145°C, and 150°C, and the holding pressure includes but is not limited to 8MPa, 9MPa, and 10MPa.

[0107] The following are specific embodiments.

[0108] Example 1

[0109] The tear-resistant heavy-duty truck engine suspension rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0110] The preparation method of the tear-resistant heavy-duty truck engine mount rubber material is as follows:

[0111] S1: Pre-treatment of reinforcing fibers

[0112] The liquid crystal polymer fiber (LCP) is uniformly soaked in the silane coupling agent for 20 minutes, and then taken out and irradiated with ultraviolet light for 10 minutes to obtain the pretreated reinforced fiber for use.

[0113] S2: One-stage mixing

[0114] Add natural rubber and styrene-butadiene rubber into a mixer and mix for 30 seconds. Then add the reinforcing fiber pretreated in step S1, adjust the temperature to 120°C, and mix for 30 seconds. Add carbon black, activator, antioxidant, microcrystalline wax, tackifier, and dispersant, maintain the temperature at 120°C, mix for 15 minutes, and discharge to obtain an intermediate mixed rubber.

[0115] S3: Second stage mixing

[0116] The intermediate rubber mix obtained in step S2 was cooled to room temperature and placed for 12 hours, then added to an internal mixer, sulfur and accelerator were added at the same time, the temperature was set to 100° C., mixed for 4 minutes, and then discharged to obtain a rubber mix.

[0117] S4: Vulcanization

[0118] The rubber mixture obtained in step S3 was injected into a molding mold at 150° C. through an injection molding device, the pressure was maintained at 8 MPa, and vulcanization was performed for 8 minutes.

[0119] Example 2

[0120] The tear-resistant heavy-duty truck engine suspension rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0121] The preparation method of the tear-resistant heavy-duty truck engine mount rubber material is as follows:

[0122] S1: Pre-treatment of reinforcing fibers

[0123] The liquid crystal polymer fiber (LCP) is uniformly soaked in the silane coupling agent for 15 minutes, and then irradiated with ultraviolet light for 10 minutes to obtain the pretreated reinforced fiber for use.

[0124] S2: One-stage mixing

[0125] Add natural rubber and styrene-butadiene rubber into an internal mixer and mix for 30 seconds. Then add the reinforcing fiber pretreated in step S1, adjust the temperature to 120°C, and mix for 30 seconds. Add carbon black, activator, antioxidant, microcrystalline wax, tackifier, and dispersant, maintain the temperature at 120°C, mix for 12 minutes, and discharge to obtain an intermediate mixed rubber.

[0126] S3: Second stage mixing

[0127] The intermediate rubber mix obtained in step S2 was cooled to room temperature and placed for 12 hours, then added to an internal mixer, sulfur and accelerator were added at the same time, the temperature was set to 100° C., mixed for 3 minutes, and then discharged to obtain a rubber mix.

[0128] S4: Vulcanization

[0129] The rubber mixture obtained in step S3 was injected into a molding mold at 150° C. through an injection molding device, the pressure was maintained at 8 MPa, and vulcanization was performed for 8 minutes.

[0130] Example 3

[0131] The tear-resistant heavy-duty truck engine suspension rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0132] The preparation method of the tear-resistant heavy-duty truck engine suspension rubber material is the same as that in Example 1.

[0133] Example 4

[0134] The tear-resistant heavy-duty truck engine suspension rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0135] The preparation method of the tear-resistant heavy-duty truck engine suspension rubber material is the same as that of Example 2.

[0136] Example 5

[0137] The tear-resistant heavy-duty truck engine suspension rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0138] The preparation method of the tear-resistant heavy-duty truck engine suspension rubber material is the same as that in Example 1.

[0139] Example 6

[0140] The tear-resistant heavy-duty truck engine suspension rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), and the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0141] The preparation method of the tear-resistant heavy-duty truck engine suspension rubber material is the same as that of Example 2.

[0142] Example 7

[0143] The tear-resistant heavy-duty truck engine suspension rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0144] The preparation method of the tear-resistant heavy-duty truck engine mount rubber material is as follows:

[0145] S1: Pre-treatment of reinforcing fibers

[0146] The liquid crystal polymer fiber (LCP) is uniformly soaked in the silane coupling agent for 10 minutes, and then irradiated with ultraviolet light for 6 minutes to obtain the pretreated reinforced fiber for later use.

[0147] S2: One-stage mixing

[0148] Add natural rubber and styrene-butadiene rubber into an internal mixer and mix for 40 seconds. Then add the reinforcing fiber pretreated in step S1, adjust the temperature to 140°C, and mix for 20 seconds. Add carbon black, activator, antioxidant, microcrystalline wax, tackifier, and dispersant, maintain the temperature at 140°C, mix for 10 minutes, and discharge to obtain an intermediate mixed rubber.

[0149] S3: Second stage mixing

[0150] The intermediate rubber mix obtained in step S2 was cooled to room temperature and placed for 8 hours, then added to an internal mixer, sulfur and accelerator were added at the same time, the temperature was set to 115° C., mixed for 2 minutes, and then discharged to obtain a rubber mix.

[0151] S4: Vulcanization

[0152] The rubber mixture obtained in step S3 was injected into a molding mold at 140° C. through an injection molding device, the pressure was maintained at 10 MPa, and vulcanization was performed for 10 minutes.

[0153] Example 8

[0154] The tear-resistant heavy truck engine suspension rubber material includes the following raw material components by weight: 75 parts of natural rubber, 22 parts of styrene-butadiene rubber, 15 parts of reinforcing fiber, 12 parts of carbon black, 3 parts of activator, 1.5 parts of antioxidant, 2 parts of microcrystalline wax, 1.5 parts of promoter, 2 parts of tackifier, 3 parts of dispersant, 1 part of sulfur, and 0.5 parts of silane coupling agent. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP) purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5mm; the activator is magnesium oxide; the antioxidant is antioxidant RD; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is modified phenolic resin; the dispersant is KT-8A; and the silane coupling agent is QX-618.

[0155] The preparation method of the tear-resistant heavy-duty truck engine mount rubber material is as follows:

[0156] S1: Pre-treatment of reinforcing fibers

[0157] The liquid crystal polymer fiber (LCP) is uniformly soaked in the silane coupling agent for 10 minutes, and then taken out and irradiated with ultraviolet light for 5 minutes to obtain the pretreated reinforced fiber for use.

[0158] S2: One-stage mixing

[0159] Add natural rubber and styrene-butadiene rubber into a mixer and mix for 50 seconds. Then add the reinforcing fiber pretreated in step S1, adjust the temperature to 120-140°C, and mix for 15 seconds. Add carbon black, activator, antioxidant, microcrystalline wax, tackifier, and dispersant, maintain the temperature at 130°C, mix for 18 minutes, and discharge to obtain an intermediate mixed rubber.

[0160] S3: Second stage mixing

[0161] The intermediate rubber mix obtained in step S2 was cooled to room temperature and placed for 6 hours, then added to an internal mixer, sulfur and accelerator were added at the same time, the temperature was set to 95° C., mixed for 4 minutes, and then discharged to obtain a rubber mix.

[0162] S4: Vulcanization

[0163] The rubber mixture obtained in step S3 was injected into a molding mold at 170° C. through an injection molding device, the pressure was maintained at 9 MPa, and vulcanization was performed for 10 minutes.

[0164] Example 9

[0165] The tear-resistant heavy truck engine suspension rubber material includes the following raw material components by weight: 90 parts of natural rubber, 15 parts of styrene-butadiene rubber, 8 parts of reinforcing fiber, 12 parts of carbon black, 8 parts of activator, 4 parts of antioxidant, 4 parts of microcrystalline wax, 3.5 parts of promoter, 3 parts of tackifier, 1 part of dispersant, 1.5 parts of sulfur, and 1.5 parts of silane coupling agent. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP) purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5mm; the activator is magnesium oxide; the antioxidant is antioxidant RD; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is modified phenolic resin; the dispersant is KT-8A; and the silane coupling agent is QX-618.

[0166] The preparation method of the tear-resistant heavy-duty truck engine mount rubber material is as follows:

[0167] S1: Pre-treatment of reinforcing fibers

[0168] The liquid crystal polymer fiber (LCP) is uniformly soaked in the silane coupling agent for 20 minutes, and then taken out and irradiated with ultraviolet light for 10 minutes to obtain the pretreated reinforced fiber for use.

[0169] S2: One-stage mixing

[0170] Add natural rubber and styrene-butadiene rubber into an internal mixer and mix for 40 seconds. Then add the reinforcing fiber pretreated in step S1, adjust the temperature to 140°C, and mix for 20 seconds. Add carbon black, activator, antioxidant, microcrystalline wax, tackifier, and dispersant, maintain the temperature at 140°C, mix for 10 minutes, and discharge to obtain an intermediate mixed rubber.

[0171] S3: Second stage mixing

[0172] The intermediate rubber mix obtained in step S2 was cooled to room temperature and placed for 12 hours, then added to an internal mixer, sulfur and accelerator were added at the same time, the temperature was set to 115° C., mixed for 4 minutes, and then discharged to obtain a rubber mix.

[0173] S4: Vulcanization

[0174] The rubber mixture obtained in step S3 was injected into a molding mold at 130° C. through an injection molding device, the pressure was maintained at 8 MPa, and vulcanization was performed for 12 minutes.

[0175] Comparative Example 1

[0176] The rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0177] The preparation method of the rubber material is as follows (according to the weight parts in Table 1):

[0178] S1 one-stage mixing

[0179] Add natural rubber and styrene-butadiene rubber into a mixer and mix for 30 seconds. Then adjust the temperature to 120°C, add carbon black, activator, antioxidant, microcrystalline wax, tackifier, dispersant, maintain the temperature at 120°C, mix for 15 minutes, and discharge to obtain an intermediate mixed rubber.

[0180] S2 two-stage mixing

[0181] The intermediate rubber mix obtained in step S1 is cooled to room temperature and placed for 12 hours, then added to an internal mixer, sulfur and an accelerator are added at the same time, the temperature is set to 100° C., and mixed for 4 minutes, and then the rubber is discharged to obtain a rubber mix;

[0182] S3 Vulcanization

[0183] The rubber mixture obtained in step S2 is injected into a molding mold at 150° C. through an injection molding device, the pressure is maintained at 8 MPa, and vulcanized for 8 minutes.

[0184] Comparative Example 2

[0185] The rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0186] The preparation method of the rubber material is the same as that of Comparative Example 1.

[0187] Comparative Example 3

[0188] The rubber material includes the raw material components shown in Table 1 by weight. Among them, the reinforcing fiber is liquid crystal polymer fiber (LCP), purchased from Sumitomo Corporation, model E5204L; the average fiber length is 0.5 mm; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0189] The preparation method of the rubber material is the same as that of Comparative Example 1.

[0190] Comparative Example 4

[0191] The rubber material includes the following raw material components by weight: 90 parts of natural rubber, 15 parts of styrene-butadiene rubber, 20 parts of reinforcing fiber, 15 parts of carbon black, 5 parts of activator, 3 parts of antioxidant, 3 parts of microcrystalline wax, 3 parts of promoter, 1 part of tackifier, 2 parts of dispersant, 1.5 parts of sulfur, and 1.3 parts of silane coupling agent. Among them, the reinforcing fiber is glass fiber; the activator is zinc oxide; the antioxidant is antioxidant 4010NA; the promoter is obtained by mixing CBS and DTDM in a mass ratio of 1:1; the tackifier is coumarone resin; the dispersant is ethylene bis stearamide; and the silane coupling agent is A-1120.

[0192] The preparation method of the rubber material is the same as that of Example 1.

[0193] The raw materials and proportions of Examples 1 to 7 and Comparative Examples 1 to 4 are shown in Table 1 below:

[0194] Table 1 Raw materials and weight parts of Examples 1 to 7 and Comparative Examples 1 to 4 (unit: part)

[0195]

[0196] Test example:

[0197] The rubber materials prepared in Examples 1 to 7 and Comparative Examples 1 to 4 were subjected to mechanical property tests, and the test results are shown in Table 2. The Shore A hardness passed the GB / T531.1-2008 test; the tear strength passed the GB / T 529-2008 (right angle type) test; and the tensile strength passed the GB / T528-2009 test.

[0198] Table 2 Test data of Examples 1 to 7 and Comparative Examples 1 to 4

[0199]

[0200] As can be seen from Table 2 above, compared with Example 1, Comparative Examples 1 to 3 did not add reinforcing fibers and silane coupling agents, and their tear strength and tensile strength were significantly reduced. Compared with Example 1, although Comparative Example 4 added fibers, its tensile strength and tear strength were still lower than those of the present embodiment due to the different types of fibers.

[0201] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0202] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A tear-resistant heavy-duty truck engine suspension rubber material, characterized in that: The preparation materials include the following by weight: Natural rubber 75~90 parts, 15 to 25 parts of styrene-butadiene rubber, Reinforced fiber 8~20 parts, Carbon black 12~25 parts, 3 to 8 parts of activator, 1.5 to 4 parts of antioxidant 2~4 parts of microcrystalline wax, 1.5~3.5 parts of accelerator, 1~3 parts of thickener, Dispersant 1~3 parts, 0.5~1.5 parts of sulfur, Silane coupling agent 0.5~1.5 parts.

2. The tear-resistant heavy truck engine mount rubber material according to claim 1, characterized in that: The tear-resistant heavy-duty truck engine suspension rubber material comprises the following raw materials in parts by weight: 80~90 parts of natural rubber, 15 to 25 parts of styrene-butadiene rubber, Reinforcement fiber 10~20 parts, Carbon black 15~25 parts, 3~5 parts of activator, 1.5 to 3 parts of antioxidant 3~4 parts of microcrystalline wax, 2~3 parts of accelerator, 1~2 parts of thickener, Dispersant 1~2 parts, 0.5~1.5 parts of sulfur, Silane coupling agent 0.5~1.5 parts.

3. The heavy tear resistant truck engine mount rubber material according to any one of claims 1 to 2, characterized in that: The mass ratio of the natural rubber to the styrene-butadiene rubber is 3.2-6:

1.

4. The tear-resistant heavy truck engine mount rubber material according to any one of claims 1 to 2, characterized in that: The reinforcing fiber satisfies at least one of the following conditions (1) to (4): (1) The reinforcing fiber is a polyarylate fiber; (2) The reinforcing fiber is a liquid crystal polymer fiber; (3) The length of the reinforcing fiber is 0.2~1mm; the density of the reinforcing fiber is 1.20 g / cm 3 ~1.70g / cm 3 , moisture absorption rate is 0.02%~0.06%; (4) The reinforcing fibers include Sumitomo , Sumitomo's , Celanese's VECTRA A950, Blonde's Vicryst R830 or at least one of them.

5. The tear-resistant heavy truck engine mount rubber material according to any one of claims 1 to 2, characterized in that: The activator includes at least one of zinc oxide and magnesium oxide; the antioxidant includes at least one of antioxidant 4010NA and antioxidant RD.

6. The tear-resistant heavy truck engine mount rubber material according to any one of claims 1 to 2, characterized in that: The accelerator is obtained by mixing CBS and DTDM; the mass ratio of the CBS to the DTDM is 1-1.5:1; and the tackifier includes at least one of coumarone resin and modified phenolic resin.

7. The tear-resistant heavy-duty truck engine mount rubber material according to any one of claims 1 to 2, characterized in that: The dispersant includes at least one of ethylene bisstearamide and dispersant KT-8A; the silane coupling agent includes at least one of A-1120 and QX-618.

8. A method for preparing the tear-resistant heavy truck engine suspension rubber material according to any one of claims 1 to 7, characterized in that: The steps include: according to the mass fraction, S1: mixing and soaking the reinforcing fiber and the silane coupling agent, and irradiating the reinforcing fiber with ultraviolet light to obtain the pretreated reinforcing fiber for standby use; S2: Mixing natural rubber and styrene-butadiene rubber to obtain a raw rubber material, then adding the pretreated reinforcing fiber, heating and mixing, adding carbon black, activator, antioxidant, microcrystalline wax, tackifier, dispersant, and heat-insulating internal mixing to obtain an intermediate mixed rubber; S3: Cooling the intermediate rubber mix to room temperature, standing it, adding it to an internal mixer, adding sulfur and an accelerator, and mixing to obtain a rubber mix; S4: The mixed rubber is injection molded to obtain a tear-resistant heavy-duty truck engine suspension rubber material.

9. The preparation method according to claim 8, characterized in that: In S1, the soaking time is 10 min to 20 min, and the ultraviolet irradiation time is 5 min to 10 min; In S2, the mixing and kneading time is 30s~50s; the temperature-raising mixing refers to heating to 120℃~140℃ and kneading for 15s~30s; and the heat-insulating mixing refers to kneading at 120℃~140℃ for 10min~18min.

10. The preparation method according to claim 8, characterized in that: In S3, the standing time is 6 hours to 12 hours; the mixing temperature is 95° C. to 115° C., and the mixing time is 2 minutes to 4 minutes; In S4, the injection molding is to inject the mixed rubber into a molding mold at 150° C. to 170° C. through an injection molding device, maintain a pressure of 8 MPa to 10 MPa, and vulcanize for 5 min to 10 min; Alternatively, the rubber mixture is injected into a molding mold at 130°C to 150°C through an injection molding device, the pressure is maintained at 8MPa to 10MPa, and vulcanized for 6min to 12min.

Images