阅读说明：本技术 一种汽车悬架衬套用高阻尼橡胶材料及其制备方法和应用 (High-damping rubber material for automobile suspension bushing and preparation method and application thereof ) 是由 吕聪聪 熊友超 于 2020-04-09 设计创作，主要内容包括：本发明公开了一种汽车悬架衬套用高阻尼橡胶材料及其制备方法和应用,橡胶材料包括：天然橡胶、防老剂、活性剂、环烷油、炭黑、硫磺和促进剂,还包括特定的丁苯橡胶和特定的复合微晶石蜡；天然橡胶与丁苯橡胶的投料质量比为50-70∶30-50；以天然橡胶与丁苯橡胶的总添加量100份计,复合微晶石蜡的添加量为3-5份；制备：将除硫化体系外的所有原材料进行混炼得到母胶；将母胶及硫化体系进行混炼,得到混炼胶混合物,硫化,制成；以及上述橡胶材料在汽车悬架衬套中的应用；本发明橡胶材料能够较明显地提升以天然橡胶为主的橡胶材料的阻尼,而且还兼具较优异的耐老化以及耐臭氧等功能。(The invention discloses a high-damping rubber material for an automobile suspension bushing and a preparation method and application thereof, wherein the rubber material comprises the following components in parts by weight: natural rubber, an anti-aging agent, an active agent, naphthenic oil, carbon black, sulfur and an accelerator, and also comprises specific styrene-butadiene rubber and specific composite microcrystalline paraffin; the feeding mass ratio of the natural rubber to the styrene butadiene rubber is 50-70: 30-50; the addition amount of the composite microcrystalline wax is 3-5 parts based on 100 parts of the total addition amount of the natural rubber and the styrene butadiene rubber; preparation: mixing all raw materials except a vulcanization system to obtain master batch; mixing the master batch and a vulcanization system to obtain a rubber compound mixture, and vulcanizing to obtain the rubber compound mixture; and the use of the above rubber material in automotive suspension bushings; the rubber material can obviously improve the damping of rubber materials mainly comprising natural rubber, and has excellent functions of aging resistance, ozone resistance and the like.)

1. A rubber material for an automotive suspension bushing, the rubber material comprising the following components: the rubber material is characterized by also comprising styrene butadiene rubber and composite microcrystalline wax;

the styrene-butadiene rubber has 25-35% of styrene content and 40-50% of ethylene content;

the composite microcrystalline paraffin consists of microcrystalline paraffin with a freezing point of 50-58 ℃ and microcrystalline paraffin with a freezing point of 62-70 ℃, and the feeding mass ratio of the microcrystalline paraffin with a freezing point of 50-58 ℃ to the microcrystalline paraffin with a freezing point of 62-70 ℃ is 0.8-1.2: 1;

wherein the feeding mass ratio of the natural rubber to the styrene butadiene rubber is 50-70: 30-50; the addition amount of the composite microcrystalline wax is 3-5 parts based on 100 parts of the total addition amount of the natural rubber and the styrene butadiene rubber.

2. The rubber material for the automobile suspension bushing according to claim 1, wherein the rubber material comprises, by mass, 50-70 parts of natural rubber, 30-50 parts of styrene-butadiene rubber, 2-4 parts of an anti-aging agent, 3-5 parts of composite microcrystalline wax, 6-10 parts of an active agent, 5-15 parts of naphthenic oil, 35-55 parts of carbon black, 1.5-3.0 parts of sulfur and 1.0-2.0 parts of an accelerator, and the total addition amount of the natural rubber and the styrene-butadiene rubber is 100 parts.

3. The rubber material for the automobile suspension bushing according to claim 1 or 2, wherein the antioxidant is one or a combination of more of ketoamine antioxidant, diphenylamine and derivatives thereof, p-phenylenediamine and derivatives thereof, environmentally-friendly hindered phenol antioxidant, and hindered diphenol antioxidant.

4. The rubber material for automotive suspension bushings according to claim 1 or 2, characterized in that the active agent is composed of an inorganic active agent comprising active zinc oxide and an organic active agent comprising stearic acid.

5. The rubber material for an automobile suspension bushing according to claim 1 or 2, wherein the carbon black is a combination of one or more selected from carbon black SAF, carbon black ISAF, carbon black N339, carbon black HAF and carbon black FEF.

6. The rubber material for an automotive suspension bushing according to claim 1 or 2, wherein the sulfur is insoluble sulfur.

7. The rubber material for an automobile suspension bushing according to claim 1 or 2, wherein the accelerator is a combination of one or more selected from thiazole accelerators, sulfenamide accelerators, thiuram accelerators and guanidine accelerators.

8. A method for preparing a rubber material for an automobile suspension bushing according to any one of claims 1 to 7, comprising the steps of: weighing the raw materials according to the proportion of the formula,

1) all raw materials except the vulcanization system are put into an internal mixer for shearing and mixing, the mixing temperature is not more than 160 ℃, and the master batch is obtained after sheet discharging, cooling and standing; wherein the vulcanization system comprises sulfur and an accelerator;

2) and putting the master batch and the vulcanization system into an internal mixer for mixing at the mixing temperature of not more than 100 ℃ to obtain a rubber compound mixture, and vulcanizing to prepare the rubber material for the automobile suspension bushing.

9. The method for preparing a rubber material for an automobile suspension bushing as claimed in claim 8, wherein the vulcanization temperature is 150-170 ℃.

10. An automobile suspension bushing, characterized in that the raw material of the automobile suspension bushing comprises the rubber material for an automobile suspension bushing according to any one of claims 1 to 7.

Technical Field

The invention belongs to the field of automobile suspension comfort bushings, and particularly relates to a high-damping rubber material for an automobile suspension bushing, and a preparation method and application thereof.

Background

With the development of modern science and technology and the improvement of the living standard of people, the requirement of people on the comfort of automobiles is continuously improved, and the automobile suspension damping system plays an increasingly important role. Generally, a mixture mainly containing natural rubber is mostly used for an automobile suspension bushing, the fatigue resistance of the automobile suspension bushing is excellent due to the molecular structure and the geometric configuration of the natural rubber, but the cohesive energy between molecules is lower when a macromolecular chain is more flexible, namely the elasticity of the rubber mixture is better and the hysteresis loss is small. Some swing arm bushings which need to absorb the vibration such as the swing vibration transmitted by a steering wheel when an automobile runs at a high speed, the brake shake after braking and the like need to use rubber with relatively high hysteresis loss as a main material, but the traditional bushings use natural rubber and rubber mixture and cannot meet the requirement of relatively high damping; therefore, it is necessary to develop a rubber mixture with relatively high damping and fatigue resistance meeting the use requirement, and at the same time, the current rubber materials are still not ideal in aging resistance and ozone resistance, and a solution is needed.

Disclosure of Invention

The invention aims to overcome one or more defects in the prior art and provide an improved rubber material for an automobile suspension bushing, which can obviously improve the damping of a rubber material mainly comprising natural rubber and has excellent functions of aging resistance, ozone resistance and the like.

The invention also provides a preparation method of the rubber material for the automobile suspension bushing.

The invention also provides an automobile suspension bushing, and the raw materials of the automobile suspension bushing comprise the rubber material for the automobile suspension bushing.

In order to achieve the purpose, the invention adopts a technical scheme that:

a rubber material for an automotive suspension bushing, the rubber material comprising the following components: natural rubber, an anti-aging agent, an activator, naphthenic oil, carbon black, sulfur and an accelerator; wherein the rubber material also comprises styrene butadiene rubber and composite microcrystalline paraffin;

the styrene-butadiene rubber has 15-35% of styrene content and 30-65% of ethylene content;

the composite microcrystalline paraffin consists of microcrystalline paraffin with a freezing point of 50-58 ℃ and microcrystalline paraffin with a freezing point of 62-70 ℃, and the feeding mass ratio of the microcrystalline paraffin with a freezing point of 50-58 ℃ to the microcrystalline paraffin with a freezing point of 62-70 ℃ is 0.8-1.2: 1;

wherein the feeding mass ratio of the natural rubber to the styrene butadiene rubber is 50-70: 30-50; the addition amount of the composite microcrystalline wax is 3-5 parts based on 100 parts of the total addition amount of the natural rubber and the styrene butadiene rubber.

According to some preferable and specific aspects of the invention, in the rubber material, 50-70 parts of natural rubber, 30-50 parts of styrene-butadiene rubber, 2-4 parts of anti-aging agent, 3-5 parts of composite microcrystalline wax, 6-10 parts of activator, 5-15 parts of naphthenic oil, 35-55 parts of carbon black, 1.5-3.0 parts of sulfur and 1.0-2.0 parts of accelerator are calculated by mass parts, and the total addition amount of the natural rubber and the styrene-butadiene rubber is 100 parts.

According to some specific aspects of the invention, the antioxidant is a combination of one or more of a ketoamine antioxidant, diphenylamine and derivatives thereof, p-phenylenediamine and derivatives thereof, environmentally-friendly hindered phenol antioxidant, and hindered diphenol antioxidant.

According to some specific aspects of the invention, the active agent is comprised of an inorganic active agent comprising activated zinc oxide and an organic active agent comprising stearic acid.

According to some particular aspects of the invention, the naphthenic oil is a conventional naphthenic oil that is commercially available. According to a specific aspect of the present invention, the naphthenic oil used in the present invention may be Xinjiang Craya 4010 naphthenic oil, 4006 naphthenic oil, etc., and is not particularly limited thereto.

According to some specific aspects of the present invention, the carbon black is a combination of one or more selected from carbon black SAF, carbon black ISAF, carbon black N339, carbon black HAF, and carbon black FEF.

According to some preferred aspects of the invention, the sulphur is insoluble sulphur.

According to some specific aspects of the invention, the accelerator is a combination of one or more selected from thiazole accelerators, sulfenamide accelerators, thiuram accelerators and guanidine accelerators.

The invention provides another technical scheme that: the preparation method of the rubber material for the automobile suspension bushing comprises the following steps: weighing the raw materials according to the proportion of the formula,

1) all raw materials except the vulcanization system are put into an internal mixer for shearing and mixing, the mixing temperature is not more than 160 ℃, and the master batch is obtained after sheet discharging, cooling and standing; wherein the vulcanization system comprises sulfur and an accelerator;

2) and putting the master batch and the vulcanization system into an internal mixer for mixing at the mixing temperature of not more than 100 ℃ to obtain a rubber compound mixture, and vulcanizing to prepare the rubber material for the automobile suspension bushing.

According to some preferred aspects of the invention, the temperature of the vulcanization is 150-.

The invention provides another technical scheme that: the automobile suspension bushing is made of the rubber material for the automobile suspension bushing.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

according to the invention, the specific styrene-butadiene rubber and the natural rubber are innovatively compounded, the solubility of the styrene-butadiene rubber and the natural rubber is similar, the compatibility is better, the phase separation phenomenon cannot occur, the rubber material is endowed with higher damping, excellent fatigue resistance, aging resistance and heat resistance, and the viscoelasticity of the rubber material in a wider temperature range is met; particularly, after the special microcrystalline paraffin with different solidifying points is combined, the microcrystalline paraffin can be dissolved at the vulcanization temperature of a product, can be in an oversaturated state after being cooled to be separated out to the surface of rubber to form a layer of wax film, is firmly combined, can block the attack of oxygen and ozone in the air to the rubber, and has ozone and thermal oxidation aging resistance for a short time and a long time (the microcrystalline paraffin with lower solidifying point can be quickly separated out to the surface of the rubber in a short time, the microcrystalline paraffin with higher solidifying point is slowly separated out, the microcrystalline paraffin with lower solidifying point and the microcrystalline paraffin with higher solidifying point are kept in certain balance by utilizing the stress balance relation, so that the wax film separated out to the surface of the rubber is ensured to have considerable and stable thickness, the ozone and thermal aging resistance can be realized in a short time, and if the wax film on the surface is damaged in the using process, the balance relation maintained between the microcrystalline paraffin with, at the moment, the microcrystalline paraffin with higher freezing point is deblocked and gradually separated out to the surface of the rubber to form a wax film again, so that the durable ozone resistance and the heat aging resistance of the rubber are realized);

meanwhile, the anti-aging agent can be dissolved in the specific composite microcrystalline wax and can be separated out along with the separation of the wax to generate a synergistic effect, so that the aging resistance and the ozone resistance of the rubber are further enhanced.

In addition, the rubber can realize the molding vulcanization of the traditional heat vulcanized rubber and metal or plastic without changing the production process conditions of the product.

Detailed Description

The above-described scheme is further illustrated below with reference to specific examples; it is to be understood that these embodiments are provided to illustrate the general principles, essential features and advantages of the present invention, and the present invention is not limited in scope by the following embodiments; the implementation conditions used in the examples can be further adjusted according to specific requirements, and the implementation conditions not indicated are generally the conditions in routine experiments.

Hereinafter, natural rubber is a natural rubber No. 10 standard rubber (SCR 10) available from vietnam, styrene butadiene rubber is S L R4602 (styrene content 21%, ethylene content 62%), styrene butadiene rubber is S L R3402 (styrene content 15%, ethylene content 30%), and naphthenic oil is kravayi 4010 naphthenic oil available from shengxi, unless otherwise specified.