阅读说明：本技术 一种橡胶组合物、其制备方法及其应用 (Rubber composition, preparation method and application thereof ) 是由 邱章仁 孙群 于 2021-09-09 设计创作，主要内容包括：本发明提供了本申请提供了一种橡胶组合物,其包括特定含量的顺丁橡胶、丁苯橡胶A、丁苯橡胶B、丁苯橡胶C、白炭黑、炭黑、改性树脂、活性剂、防老剂、石蜡、促进剂和硫磺。本申请还提供了橡胶组合物的制备方法及其在轮胎上的应用。本申请提供的橡胶组合物用于轮胎胎面,可减少轮胎在湿滑路面上刹车性能对温度(23℃～33℃)的依赖性,且保证轮胎具有良好的低滚阻性能。(The invention provides a rubber composition which comprises specific contents of butadiene rubber, styrene-butadiene rubber A, styrene-butadiene rubber B, styrene-butadiene rubber C, white carbon black, modified resin, an active agent, an anti-aging agent, paraffin, an accelerator and sulfur. The application also provides a preparation method of the rubber composition and application of the rubber composition to tires. The rubber composition provided by the application is used for the tire tread, so that the dependence of the braking performance of the tire on the temperature (23-33 ℃) on a wet and slippery road surface can be reduced, and the tire is ensured to have good low rolling resistance.)

1. A rubber composition comprising:

2. the rubber composition according to claim 1, wherein the styrene-butadiene rubber A has a styrene content of 33 to 37%, a vinyl content of 53 to 59%, and a Tg point of-20 ℃; the styrene-butadiene rubber B has a styrene content of 26-29%, a vinyl content of 57-61%, a Tg point of-21 ℃, the styrene-butadiene rubber C has a styrene content of 13-16%, a vinyl content of 27-31%, and a Tg point of-60 ℃.

3. The rubber composition according to claim 1, wherein the white carbon black has a BET surface area of 200 to 260m²/g。

4. The rubber composition of claim 1, wherein the sulfur is 5% oil extended sulfur.

5. The rubber composition according to claim 1, wherein the cis-butadiene rubber is contained in an amount of 20 to 25 parts by weight.

6. The rubber composition according to claim 1, wherein the styrene-butadiene rubber A is contained in an amount of 75 to 85 parts by weight.

7. The rubber composition according to claim 1, wherein the styrene-butadiene rubber C is contained in an amount of 15 to 25 parts by weight.

8. The rubber composition according to claim 1, wherein the modified resin is contained in an amount of 10 to 18 parts by weight.

9. A process for producing the rubber composition as described in any one of claims 1 to 8, comprising the steps of:

mixing butadiene rubber, butadiene styrene rubber A, butadiene styrene rubber B, butadiene styrene rubber C, white carbon black, a coupling agent, modified resin, an active agent, an anti-aging agent and paraffin according to a component ratio, and banburying to obtain an initial rubber mixture;

and mixing the initial rubber mixture with an accelerator and sulfur, and discharging rubber to obtain the rubber composition.

10. Use of the rubber composition according to any one of claims 1 to 8 or the rubber composition prepared by the preparation method according to claim 9 in automobile tires.

Technical Field

The invention relates to the technical field of rubber, in particular to a rubber composition, a preparation method and application thereof.

Background

At present, the main problems faced by the tire industry are to maintain good wear resistance, reduce rolling resistance of the tire and improve high grip on dry and wet roads.

The green tire is a product with great environmental protection significance in the 21 st century, the rolling resistance is reduced by 20-30% compared with that of a common radial tire, the oil is saved by 2-4%, and the carbon dioxide emission is reduced by 400g per 100Km of running. The green tire adopts a special tread rubber formula, a large amount of white carbon black is used as a filling agent, 40-60 parts of white carbon black are added into per hundred parts of raw rubber by weight, and some tread rubber formulas even reach more than 80 parts. The white carbon black is used as the filler for the tire, so that the grip force of the automobile on a smooth road surface can be improved, the friction force with a wet and slippery road surface can be increased, the braking distance on the wet and slippery road surface is reduced, and the driving safety factor is effectively improved.

The braking distance of the wet and slippery road surface is tested at the ambient temperature of 23 ℃ and the ambient temperature of 33 ℃, and the test results are greatly different. The braking performance of a wet and slippery road surface has a correlation with a dynamic viscoelastic tan delta value, and the larger the tan delta value is, the larger the energy loss of the rubber composition is, and the better the grip performance of the tire on the wet and slippery road surface is.

Therefore, it is important to provide a rubber composition which can improve the difference of the braking distance of a tire on a wet road surface within a certain environmental temperature range (23 ℃ to 33 ℃) while maintaining the braking performance on the existing wet road surface unchanged; meanwhile, the tan delta 60 ℃ value of the rubber composition is maintained, and the tire is ensured to have good low rolling resistance.

Disclosure of Invention

The invention aims to provide a rubber composition, which is used for a tire tread, can reduce the dependence of the braking performance of a tire on a wet and slippery road surface on temperature, and ensures that the tire has good low rolling resistance.

In view of the above, the present application provides a rubber composition comprising:

preferably, the styrene-butadiene rubber A has the styrene content of 33-37%, the vinyl content of 53-59% and the Tg point of-20 ℃; the styrene-butadiene rubber B has a styrene content of 26-29%, a vinyl content of 57-61%, a Tg point of-21 ℃, the styrene-butadiene rubber C has a styrene content of 13-16%, a vinyl content of 27-31%, and a Tg point of-60 ℃.

Preferably, the white carbon black has a BET surface area of 200-260 m²/g。

Preferably, the sulfur is 5% oil-extended sulfur.

Preferably, the content of the butadiene rubber is 20-25 parts by weight.

Preferably, the content of the styrene-butadiene rubber A is 75-85 parts by weight.

Preferably, the content of the styrene-butadiene rubber C is 15-25 parts by weight.

Preferably, the content of the modified resin is 10 to 18 parts by weight.

The application also provides a preparation method of the rubber composition, which comprises the following steps:

mixing butadiene rubber, butadiene styrene rubber A, butadiene styrene rubber B, butadiene styrene rubber C, white carbon black, a coupling agent, modified resin, an active agent, an anti-aging agent and paraffin according to a component ratio, and banburying to obtain an initial rubber mixture;

and mixing the initial rubber mixture with an accelerator and sulfur, and discharging rubber to obtain the rubber composition.

The application also provides the application of the rubber composition or the rubber composition prepared by the preparation method to automobile tires.

The application provides a rubber composition which comprises specific contents of butadiene rubber, styrene-butadiene rubber A, styrene-butadiene rubber B, styrene-butadiene rubber C, white carbon black, modified resin, an active agent, an anti-aging agent, paraffin, an accelerator and sulfur; in the rubber composition provided by the application, the low Tg styrene-butadiene rubber and the high softening point modified resin are matched, so that the difference of the dynamic viscoelastic property tan delta value in a certain temperature range (23-33 ℃) is reduced, the braking safety performance is ensured, the difference of the braking performance of the tire in the certain temperature range (23-33 ℃) on a wet and slippery road surface is improved, and the dependence of the braking performance on the temperature on the wet and slippery road surface is reduced; meanwhile, the tan delta 60 ℃ value of the rubber composition is maintained, and the tire is ensured to have good low rolling resistance.

Detailed Description

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

The difference of the road holding capacity of the rubber composition on a wet and slippery road surface in a certain temperature range (particularly the temperature change from 23 ℃ to 33 ℃) has correlation with the dynamic viscoelasticity tan delta 23 ℃ -tan delta 33 ℃, the smaller the tan delta 23 ℃ -tan delta 33 ℃, and the smaller the difference of the braking distance of the tire on the wet and slippery road surface in the certain temperature range. In view of the above performance requirements, the present application provides a rubber composition that produces a tire having good grip on wet road surfaces and good low rolling resistance. Specifically, the embodiment of the invention discloses a rubber composition, which comprises the following components:

in the rubber composition provided by the application, the content of the butadiene rubber is 10-30 parts by weight, more specifically, the content of the butadiene rubber is 15-25 parts by weight, and more specifically, the content of the butadiene rubber is 20-25 parts by weight.

The styrene-butadiene rubber A has the styrene content of 33-37%, the vinyl content of 53-59%, the Tg point of-20 ℃, and 25 parts by weight of raw rubber oil (filled with aromatic hydrocarbon processing oil) per 100 parts by weight of raw rubber oil; the styrene butadiene rubber A content is 60-90 parts by weight, more specifically, the styrene butadiene rubber A content is 65-88 parts by weight, more specifically, the styrene butadiene rubber A content is 75-85 parts by weight.

The styrene-butadiene rubber B has a styrene content of 26-29%, a vinyl content of 57-61% and a Tg point of-21 ℃. The content of the styrene butadiene rubber B is 0-30 parts by weight.

The styrene-butadiene rubber C has a styrene content of 13-16%, a vinyl content of 27-31% and a Tg point of-60 ℃. The styrene butadiene rubber C content is 10-30 parts by weight, more specifically 15-25 parts by weight, and more specifically 18-23 parts by weight.

In the application, the white carbon black is well-known white carbon black of the technical personnel in the field, and the BET surface area of the white carbon black is 215-255 m²(ii) in terms of/g. The content of the white carbon black is 70-90 parts by weight, more specifically 75-88 parts by weight, and more specifically 78-85 parts by weight.

The content of the carbon black is 2 to 10 parts by weight, and more specifically, the content of the carbon black is 4 to 8 parts by weight.

The coupling agent, the activator, the anti-aging agent, the accelerator and the sulfur are used as auxiliary agents. The content of the coupling agent is 7-10 parts by weight. The content of the active agent is 2.0-6.0 parts by weight, and the active agent is specifically selected from stearic acid and zinc oxide. The content of the anti-aging agent is 2.0-4.0 parts by weight. The content of the paraffin wax is 1.0-3.0 parts by weight. The content of the accelerator is 2.0-3.2 parts by weight. The content of the sulfur is 1.5-3.0 parts by weight.

The soft point of the modified resin is 100-120 ℃, and in a specific embodiment, the soft point is specifically 103 ℃. The content of the modified resin is 5-20 parts by weight, and more specifically, the content of the modified resin is 10-15 parts by weight.

The above-mentioned starting materials are commercially available directly, and the source thereof is not particularly limited in this application.

The invention also provides a preparation method of the rubber composition, which comprises the following steps:

mixing butadiene rubber, butadiene styrene rubber A, butadiene styrene rubber B, butadiene styrene rubber C, white carbon black, a coupling agent, modified resin, an active agent, an anti-aging agent and paraffin according to a component ratio, and banburying to obtain an initial rubber mixture;

and mixing the initial rubber mixture with an accelerator and sulfur, and discharging rubber to obtain the rubber composition.

In the preparation process, the banburying temperature is 100-200 ℃, more specifically 120-180 ℃; and banburying time is 3-5 h. The temperature of the binder removal is 80-120 ℃, and more specifically, the temperature of the binder removal is 90-100 ℃.

For further understanding of the present invention, the rubber composition and the preparation method thereof provided by the present invention are described in detail below with reference to examples, and the scope of the present invention is not limited by the following examples.

Examples

Mixing the components except the accelerator and the sulfur in the rubber composition by using a 5.5L HF internal mixer, heating to 140-150 ℃ for constant-temperature internal mixing, and discharging rubber after constant temperature is 220s to obtain an initial rubber mixture;

cooling the initial rubber mixture to room temperature, mixing with the rest accelerator and sulfur, and controlling the rubber discharge temperature at 90-100 ℃ to obtain the final rubber mixture; the ingredients of the rubber composition are specifically shown in table 1;

TABLE 1 component data Table of rubber compositions of examples and comparative examples

Butadiene rubber: the raisin stone BR 9000;

styrene-butadiene rubber A: ASAHI, S202 styrene content 33% -37%, vinyl content 53% -59%, Tg-20 ℃, every 100 weight portions of crude rubber oil extended 25 weight portions (filling aromatic hydrocarbon processing oil);

styrene-butadiene rubber B: 26-29% of styrene content of the Asahi chemical synthesis HPR 850, 57-61% of vinyl content and-21% of Tg point;

styrene-butadiene rubber C: 13 to 16 percent of XB120 styrene content, 27 to 31 percent of vinyl content and-60 ℃ of Tg point of ASAHI;

white carbon black: evonik9000GR with BET surface area of 215-255 m²/g；

Carbon black: cabot N-234 carbon black;

coupling agent: yingchuang lanxing SI-69;

modified resin: exxonebilopperperr 383N softening point 103 ℃;

stearic acid: a rich fat;

zinc oxide: special grade zinc oxide powder of Luchang chemical industry;

an anti-aging agent: shun chemical 6 PPD;

paraffin wax: yanggu huatai H2122H;

accelerator 1: further, DPG (chemical engineering, DPG);

accelerator 2: (iii) further chemical engineering of CBS;

oil-extended sulfur: 5% oil-filled sulfur in Jinghai chemical industry.

The performance of the above examples and comparative examples was tested, and the test results are shown in table 2;

TABLE 2 table of performance data for examples and comparative examples

Group of	Comparative example 1	Example 1	Example 2
				tanδ23℃-tanδ33℃	100	85	72
tanδ60℃	0.115	0.108	0.105

The data were obtained using a dynamic viscoelastic performance tester model VR7110 from UESHIMA, viscoelastic test condition 5% strain frequency 10 Hz.

From the above data, it is understood that comparative example 1 using the high softening point processed resin can improve the temperature dependence of the braking performance on a wet road surface of the rubber composition, but the rolling resistance performance is deteriorated; the low Tg point SSBR rubber is used in combination with the high softening point modified resin in the embodiments 1 and 2, so that the temperature dependence of the braking performance on a wet road surface can be improved, and the difference of the braking distance of the wet road surface in a certain temperature range can be improved.

Tires prepared using the rubber compositions of comparative example and examples 1 and 2 were subjected to WET skid performance test, WET test conditions: test Speed: 100 → 0km/h, the results are shown in Table 3;

TABLE 3 tables of data of the braking performance test after supporting the tires with the rubber compositions provided in the comparative examples and examples

Item	Comparative example 1	Example 1	Example 2
				Dist.(23℃)	46.7m	46.2m	46.6m
Dist.(33℃)	49.9m	47.4m	48.2m
				Dist.(23℃)-Dist.(33℃)	3.2m	1.2m	1.6m

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.