KR100369713B1 - Tire rubber composition using rice husk ash and environment-friendly tire - Google Patents

Abstract

The present invention relates to a tire rubber composition using chaff ash and environmentally friendly tires, and more particularly to a tire rubber composition and a tire using the same by using chaff ash as a reinforcing agent in the raw material rubber to protect the environment. It is about.

Description

TIRE RUBBER COMPOSITION USING RICE HUSK ASH AND ENVIRONMENT-FRIENDLY TIRE}

The present invention relates to a tire rubber composition using rice husk ash and an environmentally friendly tire, and more particularly, to a tire rubber capable of protecting the environment by recycling chaff by using chaff ash as a reinforcing agent in raw material rubber. A composition and a tire using the same.

Rice is one of the world's major grains, but the rice husk is a by-product of the world. Chaff has some major disadvantages compared to other vegetable wastes. Most vegetable waste is incinerated or fermented to compost, but chaff is not. This is because chaff has little nutrients for composting, high ash content, poor burning, and low apparent weight.

Although rice plants are somewhat different, rice husks are produced about 20% of the rice, and about 15% of the rice is made of silica. More than 300 million tons of rice are produced annually in the world, and the amount of chaff generated is more than 60 million tons, which is about 5 million tons of rice per year. .

As mentioned above, chaff is produced in large quantities in rice-farming countries every year. However, due to the unique characteristics of the chaff, which has a high silica content, it is difficult to use as a fuel and has various difficulties in recycling.

The present invention has been made to solve the above problems, the object of the present invention is to recycle the chaff as a high-quality material to protect the environment, at the same time improved tire rubber composition and performance using high-quality silica obtained from chaff ash To provide environmentally friendly tires.

The tire rubber composition of the present invention is characterized in that it contains chaff ash 5 to 50 phr as a reinforcing agent in addition to the raw material rubber and the additive for a general tire rubber composition. The reason for limiting the content of chaff to 50 phr is because the active groups are rare on the surface of the rice hull, because the reinforcement is greatly reduced when used in excess, and the content of chaff is less than 5 phr, which is not preferable because the effect of the present invention is weak. not. It is also preferable to use carbon black together as a reinforcing agent.

Generally, rubber compositions for tires are reinforced with carbon black of various grades. According to the present invention, by replacing or mixing carbon black with chaff ash in a rubber composition for tires reinforced only with the conventional carbon black, there is no significant difference in basic physical properties. Instead, a tire rubber composition having improved road traction and rolling resistance characteristics can be obtained.

When carbon black is replaced or mixed with chaff ash as in the present invention, road traction and rolling resistance characteristics of the vulcanizate are improved, which is a very important physical property required for a tread for tires.

The rice hull ash containing the above-mentioned fine silica added to the rubber composition of the present invention can be obtained by completely burning the rice hull in a conventional manner at a high temperature. However, care should be taken to prevent foreign substances from entering and to burn the chaff in its original shape so as not to destroy the advanced structure of silica.

Hereinafter, the present invention will be described in more detail with reference to the following Examples and Comparative Examples. The following examples are merely examples for illustrating the present invention, and do not limit the protection scope of the present invention.

Examples and Comparative Examples

According to the blending ratio of Table 1, a rubber composition reinforced only with carbon black (comparative example) and a rubber composition (Examples 1 and 2) partially replaced with chaff ash were mixed and vulcanized at 160 ° C. for 30 minutes to prepare a vulcanizate. Table 2 shows the basic physical properties of the vulcanizates.

Table 1 (Unit: phr)

division Comparative example Example 1 Example 2 Rubber 100.0 100.0 100.0 Carbon black 80.0 70.0 60.0 Chaff ash 0.0 10.0 20.0 Si69 0.0 0.8 1.6 Zinc oxide 4.0 4.0 4.0 Stearic acid 2.0 2.0 2.0 Anti-aging 2.0 2.0 2.0 Wax 2.0 2.0 2.0 sulfur 1.0 1.0 1.0 Vulcanization accelerator 1.6 1.6 1.6

Specific specifications of materials used in the composition of the rubber composition are as follows.

(1) Rubber: SBR 1500 (styrene content is 23% by weight.)

(2) Carbon Black: N330

(3) Rice hull ash: Silica (SiO ₂ ) content is over 95%.

(4) Si69: A silane binder, wherein the compound name is bis- (3- (triethoxysilyl) -propyl) -tetrasulfide [bis- (3- (triethoxisilyl) -propyl) -tetrasulfide].

(5) Antioxidant: N -phenyl- N ' -(1,3-dimethylbutyl) -p -phenylenediamine) [ N -phenyl- N' -(1,3-dimethylbutyl) -p- phenylenediamine]

(6) Vulcanization accelerator: N- tert-butyl-2-benzothiazole sulfonic Pena imide [N-tert -buty1-2-benzothiazole sulfenamide ]

Since the chaff ash used in the examples is composed mostly of silica, the silane binder was added 8% to the chaff ash. The total amount of reinforcing agent was 80 phr, and when it was replaced with chaff ash, the chaff ash was replaced by 10 phr (Example 1) and 20 phr (Example 2), respectively.

Table 2. Comparison of Physical Properties

division Comparative example Example 1 Example 2 Hardness (kg / cm ² ) 79.0 80.0 80.0 50% modulus (kg / cm ² ) 27.2 29.2 28.8 100% modulus (kg / cm ² ) 51.6 53.0 53.4 200% Modulus (kg / cm ² ) 132.2 129.1 131.2 300% modulus (kg / cm ² ) 203.7 199.4 200.9 Tensile Strength (kg / cm ² ) 234.0 245.9 239.8 Tensile rate at cut (%) 351.2 385.7 375.8 0 ℃ tanδ 0.172 0.181 0.187 60 ℃ tanδ 0.137 0.124 0.111

As shown in Table 2, hardness, modulus, tensile strength, etc. were almost unchanged even after adding chaff ash, the tensile rate during cutting showed a tendency to increase slightly.

In particular, when the portion of carbon black was replaced with rice hull ash, 0 ° C. tan δ value was increased and conversely, 60 ° C. tan δ value was decreased. The tan δ value of 0 ° C indicates the holding power, which means that the higher the value, the better the holding power. The tanδ value of 60 ° C. represents the rolling resistance, which means that the smaller the value, the lower the rolling resistance. Therefore, it can be seen that replacing the portion of carbon black with chaff ash improves both the traction and rolling resistance characteristics. This is a very important property required for the tread of the tire.

As can be seen from the above, the rubber composition according to the present invention can be applied to the tire by recycling chaff to protect the environment and at the same time can produce a tire with improved performance using high quality silica obtained from chaff ash.

Claims (3)

A rubber composition comprising a raw material rubber and an additive for a tire rubber composition, the tire rubber composition comprising 5 to 50 phr of chaff ash as a reinforcing agent. The tire rubber composition according to claim 1, wherein carbon black is used together as a reinforcing agent. A tire in which the rubber composition according to claim 1 or 2 is applied to a tire tread.