KR100502045B1 - A rubber composition for car tread - Google Patents

Abstract

The present invention relates to a tread rubber composition for passenger cars, and more particularly, a specific gravity of 2.3 ± 0.5 and a layer height of 1 to 4 nm (silicate) 5 ~ 20wt% of silicate and one of the synthetic resin system (cashew nut shell) CNSL A nano-reinforced resin composed of 80 to 95 wt% of a phenol formaldehyde resin modified into a liquid) is added so as to be 0.5 to 10 parts by weight based on 100 parts by weight of the raw material rubber, thereby improving performance required for adjustment stability and ride comfort. Not only can the properties be easily adjusted to meet the requirements, but the carbon black grade can be changed to reduce the cost, improve the fuel efficiency, and improve the performance of the tread rubber composition such as improved process characteristics. It relates to a tread rubber composition for a passenger car.

Description

Tread rubber composition for passenger cars {A rubber composition for car tread}

The present invention relates to a tread rubber composition for passenger cars, and more particularly, it is possible to easily adjust the physical properties, such as adjustment stability, ride comfort, etc. required in the tire, as well as to change the grade of the carbon black of the tread rubber composition The present invention relates to a tread rubber composition for passenger cars capable of maintaining equivalent physical properties when improving performance.

In general, tread rubber compositions for passenger cars require physical properties such as hardness, modulus, tensile strength and elongation.

The physical properties of the rubber composition is to adjust the physical properties according to the performance of the adjustment stability or the ride comfort of the tire to be produced, in general, the physical properties are adjusted by changing the mixing ratio of the softener and filler.

However, the method of controlling the mixing ratio of the softener and the filler as described above is an increase factor of the overall manufacturing cost because the filler used is expensive, there is a problem that there is a limit to the physical property control.

In addition, in the rubber composition, it is used to change the grade of the carbon black to improve the performance and cost reduction, such as improved fuel economy characteristics, process characteristics of the tire produced, in this case the tensile properties are changed to ride comfort and adjustment stability of the tire There was a problem that the performance also changed.

Therefore, the present invention is configured to solve the above problems, and can easily adjust the physical properties according to the performance, such as adjustment stability, ride comfort, etc. required in the tire, as well as change the grade of the carbon black to improve the performance of the tread rubber composition An object of the present invention is to provide a tread rubber composition for a passenger car which can maintain equivalent physical properties when it is to be improved.

The present invention to achieve the above object,

In a tread rubber composition for passenger cars comprising synthetic rubber or a mixture of natural rubber and synthetic rubber as a raw material rubber and comprising carbon black, process oil, zinc oxide, stearic acid, antioxidant, wax, sulfur, vulcanization accelerator, etc.

It provides a tread rubber composition for passenger cars, characterized in that the nano-reinforcement resin consisting of silicate (Silicate) and phenol formaldehyde (phenol formaldehyde) resin is added to 0.5 to 10 parts by weight based on 100 parts by weight of the raw rubber. This can be achieved by

Hereinafter, the tread rubber composition for a passenger car of the present invention will be described in more detail.

In the present invention, in the general tread rubber composition for passenger cars, a nano reinforcing resin made of silicate (Silicate) and phenol formaldehyde (phenol formaldehyde) resin is added at a constant mixing ratio.

The nano-reinforcement resin as described above has a specific gravity of 2.3 ± 0.5, a layer height of 1 to 4 nm, and a phenol formaldehyde modified with 5 to 20 wt% of silicate (Siew) and one of synthetic resins (cashew nut shell liquid). phenol formaldehyde) resin is composed of 80 ~ 95wt%, the specific gravity of the nano reinforcing resin is composed of 1.11 ± 0.05.

When such nano reinforcing resin is added, sodium ions in the silicate layer are treated with an organic reactor to increase affinity with rubber to improve dispersibility, while phenol formaldehyde contained in the nano reinforcing resin is directly added to the rubber. By increasing the crosslinking density by reacting, it is possible to improve the hardness according to the amount of addition without changing the modulus of the tire produced.

In addition, even when the tire is manufactured by changing the grade of carbon black to improve fuel efficiency, process characteristics, and cost reduction of the rubber composition, it is possible to improve the riding comfort and adjustment stability performance of the tire without changing the tensile properties.

The nano-reinforcement resin as described above is preferably added 0.5 to 10 parts by weight based on 100 parts by weight of the raw material rubber, in particular, it is most effective to add 0.5 to 2.9 parts by weight, which is less than 0.5 parts by weight The control effect is insignificant, and when it is added in excess of 10 parts by weight, the excessive decrease in wear performance and the price of the rubber composition rises, which causes disadvantages in terms of economy.

In addition, as the raw material rubber used with the nano-reinforcement resin, any rubber of synthetic rubber or a mixture of natural rubber and synthetic rubber may be used, but 70 to 100 parts by weight of styrene-butadiene rubber (SBR) With respect to the natural rubber or butadiene rubber (BR) 0 to 30 parts by weight was used in combination with the raw material rubber was found to be more preferred through the examples.

The tread rubber composition for passenger cars of the present invention can easily adjust the physical properties of the tire to be manufactured, and also maintain the same state as the physical properties of the existing tire even if the grade of the carbon black.

Although the present invention will be described in more detail with reference to the following examples, the following examples are merely illustrative of the present invention, and the present invention is not limited by the following examples.

Comparative Example 1

It is made by mixing 137.5g of styrene-butadiene rubber, 75g of carbon black of N234, 9g of process oil, 3.0g of zinc oxide, 2.0g of stearic acid, 2g of antioxidant, 2g of wax, and 2.0g of sulfur 2.2g vulcanization accelerator. The tread rubber composition for passenger cars was made into the comparative example 1.

<Example 1>

A phenol prepared by the same method as Comparative Example 1, but modified with a specific gravity of 2.3 ± 0.5 and a silicate of 5 to 20 wt% having an interlayer height of 1 to 4 nm and a cashew nut shell liquid (CNSL) which is one of synthetic resins. A tread rubber composition for a passenger car manufactured by adding 2 g of a nano-reinforcement resin consisting of 80 to 95 wt% of a formaldehyde (phenol formaldehyde) resin was used as Example 1.

<Example 2>

A phenol prepared by the same method as Comparative Example 1, but modified with a specific gravity of 2.3 ± 0.5 and a silicate of 5 to 20 wt% having an interlayer height of 1 to 4 nm and a cashew nut shell liquid (CNSL) which is one of synthetic resins. A tread rubber composition for a passenger car prepared by adding 4 g of a nano-reinforcement resin composed of formaldehyde (phenol formaldehyde) resin 80 to 95 wt% was used as Example 2.

Comparative Example 2

A tread rubber composition for a passenger car manufactured by the same method as in Comparative Example 1 except that 75 g of carbon black, N375, was added instead of carbon black, N234, to be Comparative Example 2.

<Example 3>

A phenol prepared by the same method as Comparative Example 2, but modified with a specific gravity of 2.3 ± 0.5 and a silicate of 5 to 20 wt% having an interlayer height of 1 to 4 nm and a cashew nut shell liquid (CNSL) which is one of synthetic resins. A tread rubber composition for a passenger car prepared by adding 1 g of a nano-reinforcement resin composed of formaldehyde (phenol formaldehyde) resin 80 to 95 wt% was used as Example 3.

<Example 4>

A phenol prepared by the same method as Comparative Example 2, but modified with a specific gravity of 2.3 ± 0.5 and a silicate of 5 to 20 wt% having an interlayer height of 1 to 4 nm and a cashew nut shell liquid (CNSL) which is one of synthetic resins. A tread rubber composition for a passenger car prepared by adding 2 g of a nano-reinforcement resin consisting of 80 to 95 wt% of a formaldehyde (phenol formaldehyde) resin was used as Example 4.

Experimental Example

The rubber compositions of Comparative Examples 1 and 2 and Examples 1 to 4 were tested for the vulcanization conditions and physical properties of the compounded rubber according to ASTM standards, and the test results are shown in Table 1 below.

Comparative Example 1 Example 1 Example 2 Comparative Example 2 Example 3 Example 4 Pattern Viscometer (125 ℃)  Viscosity 74 76 77 69 70 71  Scorch time (minutes) 37 36 35 33 32 32 Properties  Hardness 65 67 69 63 64 65  300% modulus (㎏f / ㎠) 97 95 98 94 98 97  Tensile Strength (㎏f / ㎠) 213 210 206 193 192 191  Elongation (%) 543 530 540 520 522 517 Abruption test  Loss (mg) 33 34 33 35 34 34 Tie-elastic test  Tan Delta 0 ℃ 0.269 0.260 0.265 0.270 0.271 0.269        70 ℃ 0.173 0.174 0.175 0.167 0.165 0.167

(Cure condition: 160 ℃, vulcanized for 20 minutes)

As can be seen through Table 1, Examples 1 to 2 using the nano-reinforcement resin compared with Comparative Example 1 not using the nano-reinforcement resin, the addition amount of the nano-reinforcement resin in the state without increasing or decreasing the modulus It can be seen that the hardness increases accordingly.

In addition, in the case of Comparative Example 2 and Examples 3 and 4 tested by changing the grade of carbon black, Examples 3 and 4 using the nano-reinforcement resin is significantly different from those of Comparative Example 2 not using the nano-reinforcement resin It does not change, and also shows that the physical properties can be adjusted according to the amount of the nano-reinforcement resin added.

As described above, the tread rubber composition for passenger cars of the present invention is modified with a silicate of 5-20 wt% having a specific gravity of 2.3 ± 0.5 and an interlayer height of 1 to 4 nm and a cashew nut shell liquid (CNSL), which is one of the synthetic resins. Nano reinforcement resin consisting of 80 to 95 wt% of phenol formaldehyde resin is added so as to be 0.5 to 10 parts by weight based on 100 parts by weight of the raw material rubber, so as to meet the performance required for adjustment stability, ride comfort, etc. Not only can the properties be easily adjusted, but the carbon black grade can be changed to reduce the cost, improve fuel efficiency, and improve the performance of the tread rubber composition such as process characteristics. Bring.

Claims (3)

In a tread rubber composition for passenger cars comprising synthetic rubber or a mixture of natural rubber and synthetic rubber as a raw material rubber and comprising carbon black, process oil, zinc oxide, stearic acid, antioxidant, wax, sulfur, vulcanization accelerator, etc. In the rubber composition, a phenol formaldehyde modified with a specific gravity of 2.3 ± 0.5 and a silicate of 5 to 20 wt% having an interlayer height of 1 to 4 nm and a cashew nut shell liquid (CNSL), which is one of the synthetic resins. A tread rubber composition for a passenger car comprising 80 to 95 wt% of resin and having a specific gravity of 1.11 ± 0.05 to add 0.5 to 2.9 parts by weight based on 100 parts by weight of the raw material rubber. delete The tread rubber composition for a passenger car according to claim 1, wherein the raw material rubber is mixed with 70 to 100 parts by weight of styrene-butadiene rubber (SBR) and 0 to 30 parts by weight of butadiene rubber (BR) or natural rubber.