KR20010103233A - Tread rubber composition for bias - Google Patents

Abstract

The present invention relates to a tread rubber composition for bias, and more particularly, to a tread rubber composition for bias which has improved heat resistance by using zinc-soap as a heat-resistant aging inhibitor to a known tread rubber composition. It is about.

The present invention is characterized in that in the known tread rubber composition, 46 to 48 parts by weight of carbon black and 0.5 to 2.5 parts by weight of zinc-soap are used as a heat aging inhibitor.

The present invention provides a tread rubber composition to improve the service life of the tire by maintaining the durability by improving the heat resistance by improving the heat resistance by using Zinc-Soap as a heat-resistant anti-aging agent to the conventional tread rubber composition for bias. It aims to do it.

Description

Tread rubber composition for bias

The present invention relates to a tread rubber composition for bias, and more particularly, to a tread rubber composition for bias which has improved heat resistance by using zinc-soap as a heat-resistant aging inhibitor to a known tread rubber composition. It is about.

The tread rubber of a bias tire for trucks and buses using a conventional tube focused on maintaining abrasion resistance by using a combination of natural rubber and synthetic rubber as a raw material rubber. In the case of trucks, tires are always subjected to heavy loads because they carry heavy loads or always carry items of constant load.In the case of buses, tires are also used because they attract a large number of passengers during rush hour. Often under heavy loads.

Tread rubber has a deeper thermal accumulation under high loads, and this thermal accumulation decreases durability by promoting physical aging, and thus, the shoulder part of the tire is destroyed or the tread part is separated, leading to an accident, which causes problems in terms of safety.

The present invention provides a tread rubber composition to improve the service life of the tire by maintaining the durability by improving the heat resistance by improving the heat resistance by using Zinc-Soap as a heat-resistant anti-aging agent to the conventional tread rubber composition for bias. It aims to do it.

The present invention is described in detail as a tread rubber composition using Zinc-Soap as a heat aging inhibitor to improve the heat resistance of the tread rubber composition and ultimately increase the durability of the tire.

In the known tread rubber composition, 46 to 48 parts by weight of carbon black is used as a raw material rubber, and 0.5 to 2.5 parts by weight of zinc-soap, which is represented by the following structural formula, is used as a raw material rubber. It is done.

In the above, R represents an aryl (Aryl) group or an alkyl (Alkyl) group.

In the above, when the content of carbon black is used 46 to 48 parts by weight based on 100 parts by weight of the raw material rubber, the optimal tread properties.

Hereinafter, the present invention will be described through the following comparative examples, examples and experimental examples. However, these do not limit the technical scope of the present invention.

Comparative Example

100 parts by weight of raw rubber consisting of 90 parts by weight of natural rubber and 10 parts by weight of polybutadiene synthetic rubber having 1,4-cis content, 50 parts by weight of carbon black (N220), 6 parts by weight of process oil, 3 parts by weight of stearic acid, zincated 5 parts by weight, 2 parts by weight of wax, and 1 part by weight and 2 parts by weight of KUMANOX-RD and KUMANOX-13 as anti-aging agents, 1.7 parts by weight of sulfur and 0.7 parts by weight of vulcanization accelerator were prepared. In summary, it is shown.

Meanwhile, the tread rubber composition was blended in a Banburi mixer and vulcanized at 160 ° C. for 20 minutes.

<Example 1>

Tread rubber specimens were formulated in the same composition and method as in Comparative Example except that 100 parts by weight of natural rubber and 48 parts by weight of carbon black (N220) were used.

<Example 2>

Tread rubber specimens were formulated in the same composition and method as in the comparative example except that 100 parts by weight of natural rubber, 48 parts by weight of carbon black (N220) and 1.5 parts by weight of sulfur were used.

<Example 3>

100 parts by weight of natural rubber, 48 parts by weight of carbon black (N220), and tread rubber specimens were formulated in the same composition and method as in Comparative Example, except that 2 parts by weight of Zinc-Soap was used as a heat aging inhibitor.

<Example 4>

100 parts by weight of natural rubber, 46 parts by weight of carbon black (N220), 2 parts by weight of zinc-soap as a heat-resistant anti-aging agent, and 1.5 parts by weight of sulfur are mixed, and the tread rubber specimens are formulated in the same composition and method as in the comparative example. It was.

Table 1. Tread Rubber Compositions of Comparative Examples and Examples

Item Comparative example Example 1 Example 2 Example 3 Example 4 Natural rubber 80 100 100 100 100 Polybutadiene rubber 20 - - - - Carbon black (N220) 50 48 48 48 46 Process oil 6 6 6 6 6 Stearic acid 3 3 3 3 3 Zincification 5 5 5 5 5 Wax 2 2 2 2 2 Antioxidant (KUMANOX-RD) One One One One One Antioxidant (KUMANOX-13) 2 2 2 2 2 Heat-resistant anti-aging agent (Aktivater-73A) - - - 2 2 brimstone 1.7 1.7 1.7 1.5 1.5 Vulcanization accelerator 0.7 0.7 0.7 0.7 0.7

<Test Example 1>

The specimens of Comparative Examples and Examples 1 to 4 measured the initial and post-aging properties of hardness, 300 modulus, tensile strength, elongation, etc. according to ASTM-related regulations, and the results are shown in Table 2 below.

Table 2. Comparative Table of Physical Properties of Comparative Examples and Examples

Property item Comparative example Example 1 Example 2 Example 3 Example 4 Shore A Early 62 61 60 62 63 Aging 66 65 64 66 65 300 modulus (kg / cm ₂ ) Early 115 107 103 110 108 Aging 142 134 129 142 139 Tensile Strength (kg / cm ₂ ) Early 293 293 298 193 295 Aging 235 262 258 358 259 Elongation () Early 595 604 620 596 597 Aging 484 504 532 507 503

* Aging condition: 105 ℃, 24 hours

<Test Example 2>

The specimens of Comparative Examples and Examples 1 to 4 were measured heat resistance (H BU) according to ASTM-related regulations and the results are shown in Table 3 below.

Table 3. Heat-Resistant Properties (HBU) of Comparative Examples and Examples Specimen

Property item Comparative example Example 1 Example 2 Example 3 Example 4 Rubber fever (℃) 25.3 24.1 24.3 22.0 22.4 Blow-out Minutes 7.5 8.7 10.0 14.5 14.2 Temperature (℃) 178 183 181 184 179

<Test Example 3>

Tread rubber specimens blended according to Comparative Examples and Examples 1 to 4 were subjected to a load-up endurance test of the tire, and the results are shown in Table 4 below.

Table 4. Tire Load-up Endurance Test Results of Specimen of Comparative Examples and Examples

Property item Comparative example Example 1 Example 2 Example 3 Example 4 Travel time (hr; min) 23; 30 26; 27 35; 32 34; 36 37; 43

* Load-up driving condition: 100 loads for 7 hours at 100 pneumatic pressure → 125 loads for 16 hours at 100 pneumatic pressure → 150 loads for 24 hours at 100 pneumatic pressure → 200 loads run in the order of accident at 100 pneumatic pressure

As shown in the results of Test Examples 1 to 3, the tread rubber composition of the present invention is improved in physical properties such as tensile strength and 300 modulus, and in particular, the heat resistance and blow-out characteristics are significantly improved compared to the conventional tread rubber composition.

Claims (2)

In the known tread rubber composition, 46 to 48 parts by weight of carbon black is used as a raw material rubber, and 0.5 to 2.5 parts by weight of zinc-soap is used as a heat aging inhibitor. According to claim 1, Zinc-Soap is a bias tread rubber composition, characterized in that the material of the following structural formula In the above, R represents an aryl (Aryl) group or an alkyl (Alkyl) group.