Tire inner liner rubber material for improving tire air tightness and preparation method of tire inner liner rubber material

Abstract

The invention discloses a tire inner liner rubber material capable of improving the air tightness of a tire and a preparation method of the tire inner liner rubber material, and belongs to the technical field of automobile tires. The tire inner liner rubber material for improving the tire air tightness comprises natural rubber, common butyl rubber, star-shaped branched modified butyl rubber, carbon black, an anti-aging agent, calcium carbonate, an activating agent, an accelerant, sulfur, resin and a dispersing agent. The star branched modified butyl rubber is added on the original common butyl rubber, and the star branched modified butyl rubber is obtained by introducing a third modified component on the basis of the common butyl rubber, so that in the tire production and processing process, the internal mixing efficiency of the rubber material can be improved, the processing performance of the product can be improved, and the production cost can be reduced. And the tire can be used as an excellent raw material for producing high-performance tires.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile tires, in particular to a tire air tightness improving tire air tightness layer rubber and a preparation method thereof. BACKGROUND

[0002] At present, with the expansion of the automobile market, people's demand for ultra-high performance tires is increasing, and at the same time, higher requirements are put forward for the safety performance of tires. The market requirements for tire air tightness have also been upgraded from single performance parameters to material performance, process, detection and other whole chain systems. The core goal is to ensure driving safety, reduce energy consumption and meet the mandatory requirements of regulations.

[0003] The tire seals air through the tire air tightness layer, reducing the diffusion of air in it. The air tightness layer of the tire refers to a special material inside the tire, which mainly functions to maintain the stability of the tire pressure and prevent tire air leakage. This layer is usually made of materials that are resistant to wear, stretch and air leakage to ensure that the tire can maintain proper pressure during driving, thereby improving driving safety and performance.

[0004] In the prior art, ordinary butyl rubber is used in the air tightness layer rubber in the tire, and the air tightness still cannot meet the needs of daily driving. SUMMARY

[0005] Therefore, the present application provides a tire air tightness layer rubber and a preparation method thereof for improving tire air tightness to solve the problem of poor tire air tightness caused by the use of ordinary butyl rubber in the air tightness layer rubber in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] According to the first aspect, the present application provides a tire air tightness layer rubber for improving tire air tightness, comprising natural rubber, ordinary butyl rubber, modified butyl rubber, carbon black, antioxidant, calcium carbonate, activator, accelerator, sulfur, resin and dispersant.

[0008] Further, the modified butyl rubber is star branched modified butyl rubber.

[0009] Further, according to weight parts, it comprises: natural rubber 10-20 parts, ordinary butyl rubber 20-30 parts, carbon black 50-70 parts, antioxidant 1-2 parts, calcium carbonate 20-40 parts, activator 1-2 parts, accelerator 1-2 parts, sulfur 1-2 parts, resin 10-20 parts and dispersant 5-10 parts.

[0010] Further, according to weight parts, the star branched modified butyl rubber is 50-70 parts.

[0011] According to the second aspect, the application provides a preparation method of a tire air tightness layer rubber material for improving tire air tightness, comprising the following steps:

[0012] Step S1: 10-20 parts of natural rubber, 20-30 parts of ordinary butyl rubber, 50-70 parts of star branched modified butyl rubber and 5-10 parts of dispersant are added into an internal mixer, and the internal mixing is performed at a mixing temperature of 90-100 DEG C for 30-40 seconds to obtain a first stage mixed rubber;

[0013] Step S2: 20-40 parts of calcium carbonate and 50-70 parts of carbon black are added into the first stage mixed rubber, 1-2 parts of antioxidant and 10-20 parts of resin are added after the mixing temperature reaches 105 DEG C, and the cleaning is performed at a mixing temperature of 125 DEG C, and the rubber is discharged at a mixing temperature of 130 DEG C, and the mixing is completed to obtain a second stage mixed rubber;

[0014] Step S3: 1-2 parts of sulfur, 1-2 parts of accelerator and 1-2 parts of activator are added into the second stage mixed rubber, and the mixing is performed at a mixing temperature of 100 DEG C for 1-2 minutes to discharge the rubber, thereby obtaining the air tightness layer rubber material.

[0015] The application has the following advantages:

[0016] The application provides a tire air tightness layer rubber material for improving tire air tightness, which comprises natural rubber, ordinary butyl rubber, star branched modified butyl rubber, carbon black, antioxidant, calcium carbonate, activator, accelerator, sulfur, resin and dispersant.

[0017] The application adds star branched modified butyl rubber to the original ordinary butyl rubber, the star branched modified butyl rubber is introduced into the third modified component on the basis of the ordinary butyl rubber, and in the tire production and processing process, the mixing efficiency of the rubber material is improved, the processing performance of the product is improved, and the air tightness of the tire is improved, and the star branched modified butyl rubber can be used as an excellent raw material for high-performance tire production. DETAILED DESCRIPTION

[0018] The embodiments of the application are described below by specific examples, and those skilled in the art can easily understand other advantages and effects of the application from the disclosure. Obviously, the described examples are part of the examples of the application, not all. Based on the examples in the application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0019] Example 1

[0020] A tire inner liner rubber compound for improving tire air tightness, comprising, by weight parts: natural rubber 10 parts, common butyl rubber 20 parts, star branched modified butyl rubber 50 parts, carbon black 50 parts, antioxidant 1 part, calcium carbonate 20 parts, activator 1 part, accelerator 1 part, sulfur 1 part, resin 10 parts and dispersant 5 parts.

[0021] A preparation method of a tire inner liner rubber compound for improving tire air tightness, comprising:

[0022] Step S1: 10 parts of natural rubber, 20 parts of common butyl rubber, 50 parts of star branched modified butyl rubber and 5 parts of dispersant are added into an internal mixer, and mixing is carried out at a mixing temperature of 90-100℃ for 30-40 seconds to obtain a first stage mixing rubber;

[0023] Step S2: 20 parts of calcium carbonate and 50 parts of carbon black are added into the first stage mixing rubber, 1 part of antioxidant and 10 parts of resin are added after the mixing temperature reaches 105℃, cleaning is carried out at a mixing temperature of 125℃, and the rubber is discharged at a mixing temperature of 130℃, and the mixing is completed to obtain a second stage mixing rubber;

[0024] Step S3: 1 part of sulfur, 1 part of accelerator and 1 part of activator are added into the second stage mixing rubber, and mixing is carried out at a mixing temperature of 100℃ for 1-2 minutes to discharge the rubber, thereby obtaining the inner liner rubber compound.

[0025] Example 2

[0026] A tire inner liner rubber compound for improving tire air tightness, comprising, by weight parts: natural rubber 15 parts, common butyl rubber 25 parts, star branched modified butyl rubber 60 parts, carbon black 60 parts, antioxidant 2 parts, calcium carbonate 30 parts, activator 2 parts, accelerator 2 parts, sulfur 2 parts, resin 15 parts and dispersant 7 parts.

[0027] A preparation method of a tire inner liner rubber compound for improving tire air tightness, comprising:

[0028] Step S1: 15 parts of natural rubber, 25 parts of common butyl rubber, 60 parts of star branched modified butyl rubber and 7 parts of dispersant are added into an internal mixer, and mixing is carried out at a mixing temperature of 90-100℃ for 30-40 seconds to obtain a first stage mixing rubber;

[0029] Step S2: 30 parts of calcium carbonate and 60 parts of carbon black are added into the first stage mixing rubber, 2 parts of antioxidant and 15 parts of resin are added after the mixing temperature reaches 105℃, cleaning is carried out at a mixing temperature of 125℃, and the rubber is discharged at a mixing temperature of 130℃, and the mixing is completed to obtain a second stage mixing rubber;

[0030] Step S3: 2 parts of sulfur, 2 parts of accelerator and 2 parts of activator are added into the second stage mixing rubber, and mixing is carried out at a mixing temperature of 100°C for 1-2 minutes to discharge the rubber, thus obtaining the inner liner rubber compound.

[0031] Example 3

[0032] An inner liner rubber compound for improving the air tightness of a tire, comprising, by weight parts: 20 parts of natural rubber, 30 parts of common butyl rubber, 70 parts of star branched modified butyl rubber, 70 parts of carbon black, 2 parts of antioxidant, 40 parts of calcium carbonate, 2 parts of activator, 2 parts of accelerator, 2 parts of sulfur, 20 parts of resin and 10 parts of dispersant.

[0033] A preparation method of an inner liner rubber compound for improving the air tightness of a tire, comprising:

[0034] Step S1: 20 parts of natural rubber, 30 parts of common butyl rubber, 70 parts of star branched modified butyl rubber and 10 parts of dispersant are added into a mixer, and mixing is carried out at a mixing temperature of 90-100°C for 30-40 seconds to obtain a first stage mixing rubber;

[0035] Step S2: 40 parts of calcium carbonate and 70 parts of carbon black are put into the first stage mixing rubber, 2 parts of antioxidant and 20 parts of resin are added after the mixing temperature reaches 105°C, cleaning is carried out at a mixing temperature of 125°C, and the rubber is discharged at a mixing temperature of 130°C, and the mixing is completed to obtain a second stage mixing rubber;

[0036] Step S3: 2 parts of sulfur, 2 parts of accelerator and 2 parts of activator are added into the second stage mixing rubber, and mixing is carried out at a mixing temperature of 100°C for 1-2 minutes to discharge the rubber, thus obtaining the inner liner rubber compound.

[0037] Comparative Example

[0038] An inner liner rubber compound for improving the air tightness of a tire, comprising, by weight parts: 10 parts of natural rubber, 80 parts of common butyl rubber, 50 parts of carbon black, 1 part of antioxidant, 20 parts of calcium carbonate, 1 part of activator, 1 part of accelerator, 1 part of sulfur, 1 part of resin and 5 parts of dispersant.

[0039] The preparation method of the above-mentioned inner liner rubber compound is the same as that of Examples 1-3, and the only difference is that no star branched modified butyl rubber is added during preparation and processing.

[0040] The physical and mechanical properties of the products of the inner liner rubber compounds of Examples 1-3 and the comparative example are tested, and the specific results are shown in Table 1.

[0041] Table 1

[0042]

[0043]

[0044] The physical properties and air tightness of the air tight layer rubber were evaluated, and it was known from Table 1 that the physical properties of the tire air tight layer rubber with the star branched modified butyl rubber were equivalent to those of the tire air tight layer rubber without the star branched modified butyl rubber, and were at the same level. The air tightness of the tire air tight layer rubber with the star branched modified butyl rubber was more advantageous, and was improved by 5-10%.

[0045] It was known from the experimental data of Examples 1-3 and Comparative Examples that the star branched modified butyl rubber was added to the original ordinary butyl rubber, the star branched modified butyl rubber was a third modified component introduced on the basis of the ordinary butyl rubber, and in the tire production and processing process, not only the mixing efficiency of the rubber was improved, the processing performance of the product was improved, but also the air tightness of the tire was improved, and the star branched modified butyl rubber could be used as an excellent raw material for high performance tire production.

[0046] Although the present application has been described in detail by the general description and specific examples above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application, are within the scope of the present application claimed.

Claims

1. A tire airtight layer compound for improving tire airtightness, characterized in that, It includes natural rubber, ordinary butyl rubber, modified butyl rubber, carbon black, antioxidants, calcium carbonate, activators, accelerators, sulfur, resins, and dispersants.

2. The tire airtightness improving compound as described in claim 1, characterized in that, The modified butyl rubber is a star-branched modified butyl rubber.

3. The tire airtightness improving compound as described in claim 2, characterized in that, By weight, it includes: 10-20 parts natural rubber, 20-30 parts ordinary butyl rubber, 50-70 parts carbon black, 1-2 parts antioxidant, 20-40 parts calcium carbonate, 1-2 parts activator, 1-2 parts accelerator, 1-2 parts sulfur, 10-20 parts resin and 5-10 parts dispersant.

4. The tire airtightness improving compound as described in claim 3, characterized in that, The star-branched modified butyl rubber comprises 50-70 parts by weight.

5. The method for preparing the tire airtight layer compound for improving tire airtightness according to any one of claims 1-4, characterized in that, include: Step S1: Add 10-20 parts of natural rubber, 20-30 parts of ordinary butyl rubber, 50-70 parts of star-branched modified butyl rubber and 5-10 parts of dispersant into an internal mixer and mix at a mixing temperature of 90-100℃ for 30-40 seconds to obtain a first-stage compound. Step S2: Add 20-40 parts of calcium carbonate and 50-70 parts of carbon black to the first-stage compound. After the mixing temperature reaches 105°C, add 1-2 parts of antioxidant and 10-20 parts of resin. Clean the compound at 125°C and discharge the compound at 130°C. The second-stage compound is obtained after mixing. Step S3: Add 1-2 parts sulfur, 1-2 parts accelerator and 1-2 parts activator to the two-stage compound, mix at 100°C for 1-2 minutes and discharge the compound to obtain the airtight layer compound.

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