KR100518306B1 - Truck and bus tread compound recipes for excellent cut and chip resistance and abrasion resistance - Google Patents

Abstract

The present invention relates to a tread rubber composition of tires for trucks and buses mainly traveling on unpaved roads, and 5 to 20 parts by weight of silica and maleic acid hydride polybutadiene rubber (Polybutadiene adducted with maleic) based on 100 parts by weight of raw rubber. anhydride) is contained in 1.0 to 5 parts by weight.

The tread rubber of truck and bus tires made of the composition as described above has an effect of greatly improving heat resistance, wear resistance, and tear resistance without any other performance deterioration.

Description

Tread and bus tread compound recipes for excellent cut and chip resistance and abrasion resistance}

The present invention relates to a tread rubber composition of a tire for trucks and buses mainly traveling on unpaved roads, and more specifically, 5 to 20 parts by weight of silica and maleic hydride polybutadiene rubber ( It relates to a tread rubber composition of truck and bus tires containing 1.0 to 5 parts by weight of polybutadiene adducted with maleic anhydride.

As industrialization progresses, vehicles that operate in forestry, mining, and industrial development areas must run on both unpaved roads and pavements at the same time. It should be able to prevent tearing caused by high heat of tire due to wear and high speed driving.

In general, the compound of natural rubber, which is most commonly used as a tread rubber for non-packaging trucks and buses, is deteriorated in wear resistance due to heat generated at high speeds due to unsaturated bonds and double bonds of natural rubber and tearing in rubber properties. Combination of rubber and rubber with good properties and non-uniformity, such as natural rubber (NR) / stylene-butadiene rubber (SBR), NR / butadiene rubber (BR), NR / SBR / BR The method of improving the thermal stability characteristics by changing the crosslinking system to mono-sulfide rather than polysulfide bonds has been attempted.However, the rubber properties, in particular, the tensile strength characteristics and the tear resistance required of the tire are reduced. As a result, the wear resistance and tear resistance are simultaneously satisfied.

At present, the method for satisfying the wear resistance and tear resistance at the same time is a method using 5-20 parts by weight of silica and carbon black. However, in this method, SI-69, a coupling agent, is used to increase the affinity between silica and natural rubber, which shows a disadvantage that the tear strength decreases. Difficulty and physical property degradation due to adsorption of amine-based accelerators by silica have been the cause of deterioration of rupture characteristics.

Therefore, the present invention includes 5 to 20 parts by weight of silica and 1.0 to 5 parts by weight of maleic hydride polybutadiene rubber based on 100 parts by weight of the raw material rubber, thereby improving the tear resistance and wear resistance of trucks and buses without deteriorating other properties. It is an object to provide a tread rubber composition of a tire for use.

In order to achieve the above object, the present invention, in the tread rubber composition of truck and bus tires, 5 to 20 parts by weight of silica and 1.0 to 5 parts by weight of maleic hydride polybutadiene rubber based on 100 parts by weight of the raw material rubber It is characterized by included.

In the maleic hydride polybutadiene rubber, polybutadiene resin is added and reacted with maleic hydride, and the polybutadiene resin has a number average molecular weight of 2500 to 8500 and 1,2 to 25 to 50% of vinyl. .

The silica according to the present invention is not particularly limited, but is preferably 5 to 20 parts by weight. When 5 parts by weight or less of the silica is used, the improvement in physical properties is inadequate. Moreover, when 20 weight part or more of silica is used, tear resistance and abrasion resistance fall compared with the tire which uses 20 weight part or less of silica.

1.0 to 5 parts by weight of the maleic hydride is preferably used. If the polybutadiene rubber is less than 1 part by weight, the improvement of physical properties is insignificant, and if it is more than 5 parts by weight, heat generation and other physical properties are reduced due to the decrease in modulus.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to these examples.

Comparative Example

As shown in Table 1, the present invention is based on 100 parts by weight of raw material rubber (SMR-5CV) 50 parts by weight of carbon black (N-220), 10 parts by weight of silica, 4 parts by weight of oil, zinc oxide (ZnO) It comprises 4 parts by weight, 1 part by weight of stearic acid, 1.5 parts by weight of free sulfur, 0.8 parts by weight of accelerator (CZ) and after mixing them to prepare a tread rubber specimen using a Banbury mixer.

(Example 1))

5 parts by weight of silica and 2 parts by weight of oil, and the composition as in Comparative Example 1 except that 1.5 parts by weight of maleic anhydride polybutadiene rubber (Polybutadiene adducted with maleic anhydride, trade name: RICONE 130MA20) Rubber compositions were prepared using the compositional ratio and method.

(Example 2)

A rubber specimen was prepared using the same composition, composition, and method as in Comparative Example 1, except that 5 parts by weight of silica and 2 parts by weight of oil were used, and 3 parts by weight of maleic anhydride polybutadiene rubber was used. .

(Example 3)

A rubber specimen was prepared using the same composition, composition, and method as in Comparative Example 1, except that 5 parts by weight of silica and 2 parts by weight of oil were used, and 4.5 parts by weight of maleic hydride polybutadiene rubber was used. .

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Table 1. Tread Rubber Compositions of Examples and Comparative Examples

Creation costs Comparative example Example 1 Example 2 Example 3 Natural Rubber (SMR-5CV) 100 100 100 100 Carbon black (N220) 50 50 50 50 Silica 10 5 10 15 Ricone 130MA20 0 1.5 3 4.5 oil 4 2 2 2 ZnO 4 4 4 4 Stearic acid One One One One Free sulfur 1.5 1.5 1.5 1.5 Accelerator (CZ)) 0.8 0.8 0.8 0.8

<Test Example>

The physical properties of the rubber specimens of Comparative Examples and Examples 1 to 3 were measured by ASTM-related regulations, and the results are shown in Table 3 below.

<Test method>

1) Cutting resistance and chip resistance

A sharp blade is tested using a BF Goodrich cut chip tester while lowering the rotating specimen at a constant speed. The smaller the difference, the better the performance.

2) wear resistance

The blade is tested by pressing the upper part of the rotating specimen using B. F. Goodrich Abrasion Tester. The smaller the difference between the weight of the original specimen and the specimen weight after the test, the better the performance. Larger ones will travel longer (number of miles) before they wear out.

3) Heat build-up

Using a Perry machine's hysteresis testing machine (hystetsis testing machine) to give a certain stroke to the specimen to measure the elevated temperature, the smaller the value indicates that the excellent heat resistance characteristics. Alternatively, the smaller or smaller the temperature difference between the original specimen temperature and the final specimen temperature indicates better performance.

Table 2. Physical property measurement results of Comparative Examples and Examples 1-3

Comparative example Example 1 Example 2 Example 3 Viscosity 65 63 63 63 300% modulus (kgf / cm ² ) 90 95 98 102 Tensile Strength (kgf / cm ² ) 179 183 185 187 Elongation break (%) 532 538 528 520 Blow out (minutes) 5.6 6.2 9.7 9.5 Wear (g) 0.0253 0.0245 0.0232 0.0251 Cut and Chip (g) 0.235 0.234 0.225 0.231 Fever (℃) 35 28 25 22

As shown in Table 2, the physical property measurement results are as follows.

First, comparing the measurement results of the physical properties of Comparative Examples and Examples 1-3, it can be seen that the present invention is superior in terms of all performance including the exothermic properties than the prior invention.

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Second, when comparing the comparative example and Example 3, the rubber compound using the Ricone 130MA20 in the use of the same silica (10 parts by weight) serves as a process aid to improve the tensile strength and modulus. In particular, in the case of Example 3 using 3 parts by weight of Ricone 130MA20 compared to the comparative example it can be seen that the blow out characteristics and wear resistance significantly improved while improving the cut (chip & chip resistance) to some extent.

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Table 3 below shows the results of abrasion and tear resistance tests when the tire tread part was applied to truck tires (11R22.5 956 pattern) by selecting the comparative example and the second embodiment by changing the rubber composition. Is a comparative comparison of the performance of Example 2 when the performance of the comparative example is 100.

Table 3. Relative comparison by performance on finished tires

Comparative example Example 2 Wear 100 112 My tearing degree 100 102

As shown in Table 3, it can be seen that the tire according to the present invention (Example 2) is significantly improved in wear resistance and tear resistance performance compared to conventional tires (comparative example).

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As shown in Table 2 and Table 3 as a result of the test example, in the tread rubber composition of truck and bus tires, 5 to 20 parts by weight of silica and maleic hydride polybutadiene rubber were added to 100 parts by weight of the raw material rubber. By using it in an amount of 1.0 to 5 parts by weight, the effect of greatly improving heat resistance, abrasion resistance, and tear resistance without other performance degradation occurs.

Claims (2)

In the tread rubber composition of truck and bus tires, tires for trucks and buses comprising 5 to 20 parts by weight of silica and 1.0 to 5 parts by weight of maleic hydride polybutadiene rubber with respect to 100 parts by weight of raw rubber. Tread rubber composition. The maleic anhydride polybutadiene rubber according to claim 1, wherein the polybutadiene resin is reacted with maleic anhydride by addition of polybutadiene resin. Tread rubber composition for truck and bus tires, characterized in that 50%.