KR100805915B1 - Rubber composition for Inner liner compound - Google Patents

Abstract

The present invention relates to a rubber composition containing clay treated with silane, more specifically, clay content of 50 ~ 90wt%, mercapto-based silane content of 5 ~ 50wt%, specific gravity of 2.5 ± 0.2, average particle diameter of 0.5 ± 0.4 μm, Al ₂ O ₃ content of less than 35wt%, SiO ₂ content of less than 56wt% of the rubber composition for a tire containing a clay, characterized in that it comprises 1 to 70 parts by weight based on 100 parts by weight of the raw material rubber It is about.

An object of the present invention is to provide a rubber composition by applying a clay treated with a mercapto-based silane to a rubber composition, thereby improving rubber properties to have excellent gas permeability and at the same time improving thermal stability and dimensional stability. .

Silane, clay, rubber composition

Description

Rubber composition for tire containing clay treated with silane {Rubber composition for Inner liner compound}

The present invention relates to a rubber composition containing clay treated with silane, more specifically, clay content of 50 ~ 90wt%, silane content of 5 ~ 50wt%, specific gravity of 2.5 ± 0.2, average particle diameter of 0.5 ± 0.4 μm, Al ₂ O ₃ SiO ₂ content within 35wt% It relates to a rubber composition for a tire containing clay, characterized in that it comprises 1 to 70 parts by weight of clay content of less than 56wt% based on 100 parts by weight of the raw rubber.

Conventionally, only pure clay having a content of more than 98% of clay (Clay, Al ₂ O 3 · mSiO ₂ nH ₂ O) is added to the rubber composition for tires. It is inexpensive and mainly serves to lower the price of rubber products by increasing the volume rather than improving physical properties when applied to rubber compositions. However, if the general clay content is above a certain level, it causes a sudden drop in physical properties, there is a problem to maintain an appropriate level when using the normal clay.

The present invention has been proposed to solve the problems of the prior art as described above, the present invention improves the rubber properties by applying the clay treated with silane to the rubber composition to have excellent gas permeability and at the same time thermal stability ( It is an object to provide a rubber composition with improved thermal stability and dimensional stability.

In order to achieve the above object, the present invention is a rubber composition for a tire comprising a silane-treated clay, characterized in that 1 to 70 parts by weight of silane-treated clay, based on 100 parts by weight of the raw rubber, in a known rubber composition It includes.

The silane-treated clay has a clay content of 50 to 90 wt%, a silane content of 5 to 50 wt%, a specific gravity of 2.5 ± 0.2, an average particle diameter of 0.5 ± 0.4 μm, and Al ₂ O ₃ SiO ₂ content within 35wt% The content is used within 56wt%.

The silane treated with clay may use mercapto silane, glycidyl silane or amino silane.

Hereinafter, the present invention will be described in detail.

The present invention, in the rubber composition for tires, to improve the rubber properties including the silane-treated clay to have excellent gas permeability performance, and at the same time to improve the thermal stability (Drmal stability) and dimensional stability (Dimension stability).

It is preferable that the rubber composition for tires of this invention contains 1-70 weight part of silane treatment clay with respect to 100 weight part of raw material rubbers.

In the above, the raw rubber may be used alone or mixed with natural rubber or synthetic rubber. As the synthetic rubber, styrene-butadiene rubber, butadiene rubber, butyl rubber, epichlorohydrin rubber, nitrile rubber, hydrogenated nitrile rubber, urethane rubber, fluorine rubber, silicone rubber, acrylic rubber and the like can be used. For example, a raw material rubber composed of 10 to 20 parts by weight of natural rubber and 80 to 90 parts by weight of synthetic rubber such as styrene-butadiene rubber and butadiene rubber may be used based on 100 parts by weight of raw rubber.

When the amount of clay used in the present invention is less than 1 part by weight, the effect of dynamic improvement or improvement of gas permeability due to the improvement of physical properties does not appear, and when it exceeds 70 parts by weight, the blendability is poor and the dispersion is poor to improve the physical properties. The effect may not appear.

In the silane-treated clay, it is preferable to use a clay content of 50 to 90 wt%, a silane content of 5 to 50 wt%, a specific gravity of 2.5 ± 0.2, and an average particle diameter of 0.5 ± 0.4 μm. In addition, Al ₂ O ₃ The content is preferably within 35wt%, SiO ₂ The content is preferably within 56 wt%.

The silane treated in the clay may be selected from mercapto silane, glycidyl silane or amino silane.

The silane-treated clay of the present invention is compounded when the silica mineral of the silicate layer structure is separated into a basic unit of nano-sized sheet and treated with a silane coupling agent, thereby improving low affinity with the rubber of clay and adding it to the rubber composition. It improves the performance, increases the mechanical strength such as tensile strength and modulus, provides thermal properties such as resistance to thermal deformation and flame retardancy, and improves the function of a barrier to suppress the permeability of water and gas.

Hereinafter, the present invention will be described by the following comparative examples, examples and test examples. However, these are only presented to understand the content of the present invention, and the scope of the present invention is not limited to these comparative examples, examples, and test examples.

Comparative Example

80 parts by weight of silica (Zeosil-175), 12.8 parts by weight of silane coupling agent (X-50S), based on 100 parts by weight of raw material rubber composed of 90 parts by weight of solution-polymerized styrene-butadiene rubber (Tufdene-3330) and 10 parts by weight of natural rubber, 5 parts by weight of ordinary clay, 37.5 parts by weight of process oil, 3 parts by weight of zinc, 3 parts by weight of stearic acid, 4 parts by weight of anti-aging agent, 2 parts by weight of wax, 1.5 parts by weight of sulfur, 3.7 parts by weight of vulcanization accelerator and vulcanized at 160 to 20 minutes Rubber specimens were prepared. Table 1 below summarizes this.

In the above general clay has a clay content of 98wt%, or more, specific gravity of 2.6 ± 0.1, average particle diameter of 2.5-6.5㎛, Al ₂ O ₃ Content within 35wt%, SiO ₂ The content is used within 56wt%.

Example 1

80 parts by weight of silica (Zeosil-175), 12.8 parts by weight of silane coupling agent (X-50S), based on 100 parts by weight of raw material rubber composed of 90 parts by weight of solution-polymerized styrene-butadiene rubber (Tufdene-3330) and 10 parts by weight of natural rubber, 5 parts by weight of silane-treated clay, 37.5 parts by weight of process oil, 3 parts by weight of zincated, 2 parts by weight of stearic acid, 4 parts by weight of antioxidant, 2 parts by weight of wax, 1.5 parts by weight of sulfur, 3.7 parts by weight of vulcanization accelerator 160 to 20 Vulcanized for minutes to prepare rubber specimens. Table 1 below summarizes this.

In the silane-treated clay, the clay content is 80wt%, the silane content is 20wt%, the specific gravity is 2.5, the average particle diameter is 0.5㎛, Al₂O₃ Content within 35wt%, SiO₂ The content is used within 56wt%.

Example 2

A rubber specimen was prepared using the same composition and method as in Example 1, except that 5 parts by weight of the silane-treated clay used in Example 1 was applied.

Example 3

A rubber specimen was prepared using the same composition and method as in Example 1, except that 10 parts by weight of the silane-treated clay used in Example 1 was applied.

Table 1. Rubber Compositions of Comparative Examples and Examples

Item Comparative example Example 1 Example 2 Example 3 Synthetic rubber 90 90 90 90 Natural rubber 10 10 Silica 80 80 80 80 Silane coupling agent 12.8 12.8 12.8 12.8 General clay 5 - - - Nanoclay - 3 5 10 Process oil 37.5 37.5 37.5 37.5 Zincification 3 3 3 3 Stearic acid 2 2 2 2 Anti-aging 4 4 4 4 Wax 2 2 2 2 brimstone 1.5 1.5 1.5 1.5 Vulcanization accelerator 3.7 3.7 3.7 3.7

<Test Example>

Pattern viscosity (viscosity, scorch time), rheometer (maximum torque, vulcanization time), tensile properties (hardness, 300% modulus, tensile strength, elongation), exothermic properties, Abrasion loss and Leobibronn test (tan delta 0 ℃, tan delta 70 ℃) was measured and the results are summarized in Table 2 below.

Table 2. Property test results of specimens of Comparative Examples and Examples

Item Comparative example Example 1 Example 2 Example 3 Viscosity Viscosity 73 70 71 73 Scorch time (minutes) 28.4 33.2 31.3 28.8 Rheometer Torque 38.2 37.5 39.3 43.5 Vulcanization time (T90, minutes) 16.8 17.0 17.5 18.4 Tensile water castle Hardness 71 73 74 76 300% modulus (Kgf / cm) 119 128 135 154 The tensile strength 228 245 256 275 Elongation (%) 465 456 447 433 Exothermic characteristics 22.7 21.3 20.2 18.6 Wear loss 30.5 26.6 23.7 16.2 Gas permeability 3.12 2.09 2.38 2.45 Leobibron test Tan Delta 0 ℃ 0.290 0.291 0.289 0.295 Tan Delta 70 ℃ 0.105 0.093 0.101 0.103

As shown in the results of Table 2, the physical properties of the specimens of the examples using the same amount of clay treated with silane compared to the specimens of the comparative example using the general clay generally improve the processability, the gas permeability effect is improved, and in the tensile properties, It can be seen that the tensile strength is improved. On the other hand, as the amount of the silane-treated clay increases, it can be seen that the gas permeability is improved along with the tensile properties, the exothermic properties, and the wear characteristics.

As described above, the rubber composition for a tire including clay treated with the silane of the present invention may improve gas permeability along with tensile properties, heat generation characteristics, and wear characteristics than a rubber composition for tires using general clay.

Claims (4)

In the rubber composition for tires, 10 to 20 parts by weight of natural rubber and 80 to 90 parts by weight of styrene-butadiene rubber, including 1 to 70 parts by weight of clay treated with any one or more of silanes of amino silane or glycidyl silane. Rubber composition for a tire containing a silane-treated clay. delete The rubber composition for a tire according to claim 1, wherein the clay in the silane-treated clay has a specific gravity of 2.5 ± 0.2, an Al ₂ O ₃ content of 35 wt% or less, and a SiO ₂ content of 56 wt% or less. delete