阅读说明：本技术 一种全钢子午线轮胎胎面配方及其制备方法 (All-steel radial tire tread formula and preparation method thereof ) 是由 李卫国 李群 丁祥 于 2020-06-30 设计创作，主要内容包括：本发明公开了一种全钢子午线轮胎胎面配方,涉及橡胶加工技术领域。所述胎面配方按质量份数计,由以下质量份数的成分组成：天然胶橡胶为40-100份,高顺式丁二烯橡胶为0-40份,溶聚丁苯橡胶为0-40份,白炭黑为0-40份,炭黑为20-60份,氧化锌为1-5份,硬脂酸为1-3份,硅烷偶联剂为0-6.4份,低滚阻助剂为0-1份,防护蜡为0.5-2份,防老剂RD为1-3份,防老剂4020为1-3份,促进剂NS为1-3份,硫黄粉为0.5-3份,防焦剂为0-0.4份。本发明研制了一种全钢子午线轮胎胎面配方,通过本发明配方制备的轮胎胎面,使轮胎具有较低的轮胎滚阻,和较高的耐磨性能；本发明制备的轮胎胎面用于轮胎中,降低了汽车行驶中的油耗,同时又满足客户对轮胎高耐磨的需求。(The invention discloses an all-steel radial tire tread formula, and relates to the technical field of rubber processing. The tread formula comprises the following components in parts by mass: 40-100 parts of natural rubber, 0-40 parts of high cis-butadiene rubber, 0-40 parts of solution polymerized styrene butadiene rubber, 0-40 parts of white carbon black, 20-60 parts of carbon black, 1-5 parts of zinc oxide, 1-3 parts of stearic acid, 0-6.4 parts of silane coupling agent, 0-1 part of low rolling resistance auxiliary agent, 0.5-2 parts of protective wax, 1-3 parts of anti-aging agent RD, 1-3 parts of anti-aging agent 4020, 1-3 parts of accelerator NS, 0.5-3 parts of sulfur powder and 0-0.4 part of anti-scorching agent. The invention develops an all-steel radial tire tread formula, and the tire tread prepared by the formula has lower tire rolling resistance and higher wear resistance; when the tire tread prepared by the invention is used in a tire, the oil consumption of an automobile in running is reduced, and the requirement of a customer on high wear resistance of the tire is met.)

1. The tread formula of the all-steel radial tire is characterized by comprising the following components in parts by mass: 40-100 parts of natural rubber, 0-40 parts of high cis-butadiene rubber, 0-40 parts of solution polymerized styrene butadiene rubber, 0-40 parts of white carbon black, 20-60 parts of carbon black, 1-5 parts of zinc oxide, 1-3 parts of stearic acid, 0-6.4 parts of silane coupling agent, 0-1 part of low rolling resistance auxiliary agent, 0.5-2 parts of protective wax, 1-3 parts of anti-aging agent RD, 1-3 parts of anti-aging agent 4020, 1-3 parts of accelerator NS, 0.5-3 parts of sulfur powder and 0-0.4 part of anti-scorching agent.

2. The all-steel radial tire tread formulation according to claim 1, wherein the natural rubber is 75 parts, the high cis-butadiene rubber is 15 parts, the solution polymerized styrene-butadiene rubber is 10 parts, the white carbon black is 20 parts, the carbon black is 35 parts, the zinc oxide is 3.5 parts, the stearic acid is 2.5 parts, the silane coupling agent is 1.6 parts, the low rolling resistance auxiliary agent is 0.8 part, the protective wax is 1 part, the anti-aging agent RD is 1.5 parts, the anti-aging agent 4020 is 2 parts, the accelerator NS is 1.6 parts, the sulfur powder is 1.5 parts, and the anti-scorching agent is 0.2 part.

3. The all-steel radial tire tread formulation of claim 1 or 2, wherein the low rolling resistance aid is 1-naphthylacethydrazide.

4. The all-steel radial tire tread formulation according to claim 1, wherein the total mass portion of the natural rubber, the high cis-butadiene rubber and the solution-polymerized styrene-butadiene rubber is 100 parts.

5. The all-steel radial tire tread formulation of claim 1, wherein the solution polymerized styrene-butadiene rubber comprises: the content of vinyl is 10-35%, the content of styrene is 5-40%, and the Tg point is lower than-30 ℃.

6. The all-steel radial tire tread formulation as claimed in claim 1, wherein the carbon black iodine absorption value is 90-160g/kg, the oil absorption value is 110-140ml/100g, and the total specific surface area N₂SA of 90-145m²/g。

7. The all-steel radial tire tread formula as claimed in claim 1, wherein the total nitrogen adsorption specific surface area of the white carbon black is 100-250m²/g。

8. The all-steel radial tire tread formulation of claim 1, wherein said silane coupling agent is 0-3.2 parts of a pure silane coupling agent or 0-6.4 parts of a 50% solids silane coupling agent.

9. The all-steel radial tire tread formulation of claim 1, wherein the silane coupling agent is one or both of silane coupling agent Si69 and silane coupling agent Si 75.

10. The preparation method of the all-steel radial tire tread formula of claim 1, which is characterized by comprising the following steps:

(1) weighing each component for preparing the formula of the all-steel radial tire tread according to the component proportion;

(2) adding natural rubber, high cis-butadiene rubber, solution polymerized styrene-butadiene rubber and low rolling resistance auxiliary agent into an internal mixer, adjusting the rotating speed of the internal mixer to 60 r/min, and pressing a top bolt for mixing for 15 seconds; lifting the top bolt, adding the carbon black into an internal mixer, regulating the rotating speed of the internal mixer to 50 rpm, pressing the top bolt, and mixing for 25 seconds; lifting the top plug to clean, adjusting the rotating speed of the internal mixer to 45 rpm, pressing the top plug to mix to 145 ℃, keeping the constant temperature for 60 seconds, lifting the top plug, opening a discharging door to discharge rubber, extruding a lower sheet by a double screw, cooling and stacking;

(3) two-stage rubber mixing: adding a section of rubber compound, zinc oxide, stearic acid, an anti-aging agent RD, an anti-aging agent 4020, protective wax, white carbon black and a silane coupling agent into an internal mixer, adjusting the rotating speed of the internal mixer to 45 revolutions per minute, and pressing a top bolt for mixing for 25 seconds; lifting the top plug to clean, pressing the top plug to mix for 148 ℃, mixing for 60 seconds at constant temperature, lifting the top plug, opening a discharging door to discharge glue, extruding a lower sheet by a double screw, cooling and building stacks;

(4) three-stage rubber mixing: putting the two-stage rubber compound into an internal mixer, adjusting the rotating speed of the internal mixer to 45 r/min, and pressing a top bolt for mixing for 25 seconds; cleaning a top plug, pressing the top plug to mix to 148 ℃, lifting the top plug, opening a discharging door to discharge glue, extruding a lower sheet by a double screw, cooling and building a stack;

(5) final mixing rubber: adding the three-section rubber compound, sulfur powder, an accelerator NS and a scorch retarder into an internal mixer, adjusting the rotating speed of the internal mixer to 28 r/min, and pressing a top bolt for mixing for 25 seconds; lifting the top bolt, pressing the top bolt for mixing for 25 seconds; lifting the top plug to clean, pressing the top plug to mix to 103 ℃, lifting the top plug, opening a discharging door to discharge rubber, discharging sheets by an open mill, cooling and stacking.

Technical Field

The invention relates to the technical field of rubber processing, in particular to a tread formula of an all-steel radial tire and a preparation method thereof.

Background

The formula design of the tire has the theory of a magic triangle, wherein the magic triangle refers to the fact that the wear resistance, the wet skid resistance and the rolling resistance of the tire cannot be improved simultaneously due to the performances of the magic triangle and the tire cannot be improved simultaneously, and one or two performances must be sacrificed to improve the other performance. In the design of tire formula, the most common contradiction is the relationship between rolling resistance and wear resistance of the tire, and the wear resistance of the tire is often reduced while the rolling resistance is reduced.

The tread portion of the tire has a contribution to the rolling resistance of the tire of about 50 to 60%, which is the most significant component of all the components of the tire, and the tread portion of the tire is the only component in contact with the ground, so that the wear resistance of the tire is also contributed by the tread portion of the tire. Meanwhile, the tread component mainly comprises a tread and a base rubber, and the tread of the tire is a key structure influencing the rolling resistance and the abrasion performance of the tire. Therefore, how to develop a new tire tread formula, which can reduce the rolling resistance of the tire and improve the abrasion performance, is a technical problem to be solved in the technical field of rubber processing at present.

Disclosure of Invention

The invention provides a tread formula of an all-steel radial tire and a preparation method thereof aiming at the technical problems.

The technical scheme adopted by the invention is as follows: the tread formula of the all-steel radial tire comprises the following components in parts by mass: the tread formula comprises the following components in parts by mass: 40-100 parts of natural rubber, 0-40 parts of high cis-butadiene rubber, 0-40 parts of solution polymerized styrene butadiene rubber, 0-40 parts of white carbon black, 20-60 parts of carbon black, 1-5 parts of zinc oxide, 1-3 parts of stearic acid, 0-6.4 parts of silane coupling agent, 0-1 part of low rolling resistance auxiliary agent, 0.5-2 parts of protective wax, 1-3 parts of anti-aging agent RD, 1-3 parts of anti-aging agent 4020, 1-3 parts of accelerator NS, 0.5-3 parts of sulfur powder and 0-0.4 part of anti-scorching agent.

On the basis of the scheme, 75 parts of natural rubber, 15 parts of high cis-butadiene rubber, 10 parts of solution polymerized styrene butadiene rubber, 20 parts of white carbon black, 35 parts of carbon black, 3.5 parts of zinc oxide, 2.5 parts of stearic acid, 1.6 parts of a silane coupling agent, 0.8 part of a low rolling resistance auxiliary agent, 1 part of protective wax, 1.5 parts of an anti-aging agent RD, 2 parts of an anti-aging agent 4020, 1.6 parts of a promoter NS, 1.5 parts of sulfur powder and 0.2 part of an anti-scorching agent.

On the basis of the scheme, the low rolling resistance auxiliary agent is 1-naphthalene acetic hydrazide, and the chemical formula of the 1-naphthalene acetic hydrazide is C₁₂H₁₂N₂O。

On the basis of the scheme, the total mass part of the natural rubber, the high cis-butadiene rubber and the solution-polymerized styrene-butadiene rubber is 100 parts;

preferably, the solution polymerized styrene-butadiene rubber is calculated as pure rubber, and the oil content in the solution polymerized styrene-butadiene rubber is removed;

preferably, the natural rubber used comprises No. 10 and No. 20 natural rubber graded according to STR standard, and No. 1, No. 2 and No. 3 natural rubber graded according to smoked sheet rubber;

preferably, the high cis-butadiene rubber is butadiene rubber with a cis content of more than 96 percent, and comprises high cis-butadiene rubber adopting a nickel-based catalyst and a neodymium-based catalyst; the high cis-butadiene rubber has low heat generation, low rolling resistance and high wear resistance.

On the basis of the scheme, in the solution polymerized styrene-butadiene rubber: the content of vinyl is 10 to 35 percent, the content of styrene is 5 to 40 percent, and the Tg point is lower than minus 30 ℃; the solution polymerized styrene-butadiene rubber with the characteristics has the high ground gripping performance and the tearing resistance of the styrene-butadiene rubber, and meanwhile, the solution polymerized styrene-butadiene rubber has relatively low heat generation, low rolling resistance and high wear resistance.

On the basis of the scheme, the carbon black iodine absorption value is 90-160g/kg, the oil absorption value is 110-140ml/100g, and the total specific surface area N2SA is 90-145m²(ii)/g; the carbon black having the above characteristics has high abrasion resistance.

On the basis of the scheme, the total nitrogen adsorption specific surface area of the white carbon black is 100-250m²(ii)/g; the white carbon black with the characteristics has the advantages of large total nitrogen adsorption specific surface area, good reinforcing effect, high wear resistance and low rolling resistance.

On the basis of the scheme, the silane coupling agent is 0-3.2 parts of pure silane coupling agent or 0-6.4 parts of silane coupling agent with 50% of solid content.

On the basis of the scheme, the silane coupling agent is one or two of a silane coupling agent Si69 and a silane coupling agent Si 75.

The preparation method of the all-steel radial tire tread formula is characterized by comprising the following steps of:

(1) weighing each component for preparing the formula of the all-steel radial tire tread according to the component proportion;

(2) adding natural rubber, high cis-butadiene rubber, solution polymerized styrene-butadiene rubber and low rolling resistance auxiliary agent into an internal mixer, adjusting the rotating speed of the internal mixer to 60 r/min, and pressing a top bolt for mixing for 15 seconds; lifting the top bolt, adding the carbon black into an internal mixer, regulating the rotating speed of the internal mixer to 50 rpm, pressing the top bolt, and mixing for 25 seconds; lifting the top plug to clean, adjusting the rotating speed of the internal mixer to 45 rpm, pressing the top plug to mix to 145 ℃, keeping the constant temperature for 60 seconds, lifting the top plug, opening a discharging door to discharge rubber, extruding a lower sheet by a double screw, cooling and stacking;

(3) two-stage rubber mixing: adding a section of rubber compound, zinc oxide, stearic acid, an anti-aging agent RD, an anti-aging agent 4020, protective wax, white carbon black and a silane coupling agent into an internal mixer, adjusting the rotating speed of the internal mixer to 45 revolutions per minute, and pressing a top bolt for mixing for 25 seconds; lifting the top plug to clean, pressing the top plug to mix for 148 ℃, mixing for 60 seconds at constant temperature, lifting the top plug, opening a discharging door to discharge glue, extruding a lower sheet by a double screw, cooling and building stacks;

(4) three-stage rubber mixing: putting the two-stage rubber compound into an internal mixer, adjusting the rotating speed of the internal mixer to 45 r/min, and pressing a top bolt for mixing for 25 seconds; cleaning a top plug, pressing the top plug to mix to 148 ℃, lifting the top plug, opening a discharging door to discharge glue, extruding a lower sheet by a double screw, cooling and building a stack;

(5) final mixing rubber: adding the three-section rubber compound, sulfur powder, an accelerator NS and a scorch retarder into an internal mixer, adjusting the rotating speed of the internal mixer to 28 r/min, and pressing a top bolt for mixing for 25 seconds; lifting the top bolt, pressing the top bolt for mixing for 25 seconds; lifting the top plug to clean, pressing the top plug to mix to 103 ℃, lifting the top plug, opening a discharging door to discharge rubber, discharging sheets by an open mill, cooling and stacking.

Preferably, a BB430 internal mixer is adopted in the first-stage mixing rubber, the second-stage mixing rubber and the third-stage mixing rubber stage; a GK255 internal mixer is adopted in the final rubber mixing stage.

The invention has the beneficial effects that: the invention develops an all-steel radial tire tread formula, and the tire tread prepared by the formula has lower tire rolling resistance and higher wear resistance; when the tire tread prepared by the invention is used in a tire, the oil consumption of an automobile in running is reduced, and the requirement of a customer on high wear resistance of the tire is met.

Drawings

FIG. 1 is a result of a performance test of a tread formulation compound of the present invention after vulcanization;

FIG. 2 shows the results of physical property tests on finished tire treads of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.

Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.