KR20090033559A - Mastication method of natural rubber and tire tread rubber composition comprising aboved masticated natural rubber - Google Patents

Abstract

A mastication method of natural rubber is provided to lower the molecular weight of natural rubber, to increase mastication property while raising dispersibility with other additives and to improve properties. A mastication method of natural rubber comprises a step of adding alkylphenol disulfide 0.01~5 parts by weight as a peptizer based on natural rubber 0.01~5 parts by weight and performing mastication of the natural rubber 100.0 parts by weight. The alkyl group of alkylphenol disulfide is C1-10 alkyl group. The tire tread rubber composition the masticated natural rubber 100.0 parts by weight; and any one 10~80 parts by weight selected from silica, carbon black, calcium carbonate, clay, talc, muscovitum, illite, kaolin, tourmaline, elvan, amethyst, yellow soil and syndiotatic-1,2-polybutadiene.

Description

Natural rubber {Tastication method of natural rubber and tire tread rubber composition comprising above masticated natural rubber}

The present invention relates to a natural rubber USSR method and a tire tread rubber composition comprising the natural rubber obtained by the method. More specifically, in the natural rubber USSR, an alkylphenol disulfide as a natural rubber and a peptizer in a compounding machine The present invention relates to a tire tread rubber composition comprising a natural rubber obtained by the Soviet Union method as a raw material rubber in the USSR method and a tire tread rubber composition which is added to the Alkylphenol disulfide.

The rubber constituting tires can be classified into two types: natural rubber and synthetic rubber.

Synthetic rubber is not as high as natural rubber in the manufacture of components that make up tires, so it is used directly in the various additives used in manufacturing tires without a separate processing process.

However, the natural rubber is composed of high molecular weight material, high molecular weight, high viscosity. The use of high viscosity rubbers results in very poor compounding properties with other additives, making it difficult to disperse and yield desired physical properties. Therefore, in order to solve such a problem, when using natural rubber when manufacturing tires, first, the molecular weight of the natural rubber is reduced to lower the viscosity to increase the dispersibility with other additives to have the desired physical properties. This separate natural rubber processing process is the Soviet (mastication).

Soviet methods use both mechanical and chemical methods. When natural rubber is put into the blender and the machine is operated, the shear force is applied to the rubber, which physically breaks the rubber polymer chain to lower the molecular weight. There is some protein in the natural rubber, and even after cutting the natural rubber chain due to the functional groups and radical groups generated in the rubber chain, the recombination between the rubber chain occurs over time to increase the molecular weight again. Therefore, when the natural rubber is pulverized in the blender by chemically adding a peptizer, the components of the decomplexer promote the decomposition of the polymer chain and at the same time, bind to the decomposed chain ends to prevent stabilization and recombination. The use of these complexing agents has the advantage that the viscosity of the natural rubber is used in the Soviet Union rubber, so that the rubber product processing is very easy when the Soviet rubber is used.

Decomposition agents include ester-based physical USSR, mineral oil, calcium carbonate filler, metal cyanide chemical USSR activator, and aromatic disulfide chemical USSR, and may include all of the above components.

In the above-mentioned complexing agent, aromatic disulfide chemical soviet agent plays an important role among the complexing agent or complexing agent component and influences the viscosity and physical properties of the Soviet natural rubber. In other words, increasing the amount used to increase processability may be accompanied by a decrease in physical properties.

In the past, 2-2'-dibenzamido-diphenyl-disulfide was used as a complexing agent or a complexing agent containing the above-mentioned ingredients in order to Soviet natural rubber. When the 2-2'-dibenzamido-diphenyl-disulfide is used as a complexing agent or a complexing agent containing such a component, there is a problem in that physical properties decrease.

The present invention is to reduce the molecular weight of natural rubber to lower the viscosity to improve the properties of the Soviet Union and at the same time as the viscosity is lowered natural rubber Soviet Union method that can improve the physical properties by increasing the dispersibility with other additives and the Soviet Union of such natural rubber A tire tread rubber composition comprising natural rubber obtained by the method is provided.

In the present invention, the natural rubber in the USSR, by adding the alkylphenol disulfide (Alkylphenol disulfide) to the compounding compound in the Soviet Union (mastication) by reducing the molecular weight of the natural rubber to lower the viscosity to improve the Soviet characteristics At the same time, as the viscosity is lowered to provide a tire tread rubber composition comprising natural rubber obtained by the Soviet Union method and the natural rubber obtained by the Soviet method of the natural rubber that can improve the physical properties by increasing the dispersibility with other additives .

The present invention is a viscosity reduction of natural rubber Soviet Union alkyl phenol disulfide as a complexing agent compared to natural rubber with natural rubber Soviet Union natural rubber and 2-2'-dibenzamido-diphenyl-disulfide as a complexing agent Is maintained for a long time, as a result of the rubber product blending using the natural rubber made by the Soviet Union as the raw material rubber, there is an effect of improving the rubber product processability and physical properties.

The present invention relates to a natural rubber Soviet Union method of natural rubber in the USSR, by adding 0.01 to 5 parts by weight of alkylphenol disulfide as a desorbing agent with respect to 100 parts by weight of natural rubber.

Natural rubber of the present invention Soviet Union of the natural rubber of the Soviet Union can be carried out at 10 to 100rpm by putting a natural rubber and a complexing agent in the compounding machine.

Natural rubber of the present invention Soviet Union of the natural rubber of the Soviet Union can be carried out for 1 minute to 10 minutes at 10 to 100 rpm by putting a natural rubber and a decomposing agent in the compounding machine.

In the present invention, the complexing agent may be used to include the alkylphenol disulfide in addition to the alkylphenol disulfide alone.

In the present invention, in addition to using the alkylphenol disulfide alone, the complexing agent may include one containing 10 to 20% of the alkylphenol disulfide based on the total weight of the complexing agent.

In the above, the alkyl group of the alkylphenol disulfide is an alkyl group having 1 to 10 carbon atoms.

The present invention relates to a tire tread rubber composition comprising as a raw material rubber a natural rubber made by the Soviet Union by the above-mentioned natural rubber Soviet method.

The raw material rubber in the tire tread rubber composition of the present invention includes the natural rubber of the Soviet Union by the natural rubber Soviet method.

The raw rubber in the tire tread rubber composition of the present invention can be used by the natural rubber of the Soviet Union by the natural rubber Soviet method alone.

In the tire tread rubber composition of the present invention, the raw rubber may be a mixed rubber in which the natural rubber and the synthetic rubber are mixed by the natural rubber Soviet method.

In the tire tread rubber composition of the present invention, the raw material rubber may be a mixed rubber in which the natural rubber and the synthetic rubber are mixed in a weight ratio of 1: 9 to 9: 1 by the natural rubber Soviet method.

In the tire tread rubber composition of the present invention, the raw material rubber may be a mixed rubber in which the natural rubber of the USSR is mixed with two or more kinds of synthetic rubbers different from each other by the above-mentioned natural rubber Soviet method.

In the above, the synthetic rubber is styrene butadiene rubber (SBR), butadiene rubber (BR), butyl rubber, halogenated butyl rubber, isoprene rubber, epichlorohydrin rubber, nitrile rubber, hydrogenated nitrile rubber, isoprenebutadiene rubber, polyurethane rubber, Fluorine rubber, silicone rubber, ethylene propylene rubber, EPDM rubber, hypalon rubber, chloroprene rubber, ethylene vinyl acetate rubber, acrylic rubber, styrene butadiene rubber containing isoprene, styrene butadiene rubber including nitrile, neoprene rubber The above can be used.

Tire tread rubber composition of the present invention is a filler (silica), carbon black (carbon black), calcium carbonate (CaCO ₃ ), clay (Clay), Talc (mica), mica (illite), Kaolin, tourmaline, elvan, amethyst, yellow stone, syndiotactic-1,2-polybutadiene (SPB) You can use more than one.

As an example of the syndiotactic-1,2-polybutadiene (SPB) above, a single fiber having a diameter of 0.01 to 0.1 µm and a specific surface area of 80 to 90 m ² / g may be used.

As another example of syndiotactic-1,2-polybutadiene (SPB) above, a short fiber having a diameter of 1 to 10 µm and a specific surface area of 100 to 120 m ² / g may be used.

In the tire tread rubber composition of the present invention, the filler may be used in an amount of 10 to 80 parts by weight based on 100 parts by weight of the rubber material. If the filler is used in an amount less than 10 parts by weight based on 100 parts by weight of the raw material rubber, the effect on improving the physical properties is insignificant, and it is used in excess of 80 parts by weight.

Various components and contents are applied to the tire tread rubber composition of the present invention, and in order to obtain a tire tread rubber composition consistent with the object of the present invention, a rubber composition for a tire under the above-mentioned conditions is preferable.

According to the present invention, various additives such as fillers, anti-aging agents, activators, process oils, vulcanizing agents, and vulcanization accelerators, which are used in conventional tire tread rubber compositions, in addition to the above-mentioned raw rubbers and fillers are appropriately selected as necessary. Can be used. However, these are general components used in conventional tire tread rubber compositions, and thus are not essential components of the present invention, and thus the detailed descriptions thereof will be omitted.

The present invention includes the natural rubber of the Soviet Union by the above-mentioned natural rubber Soviet Union method as a raw material rubber, the rubber comprises a tire tread rubber composition containing such raw rubber.

The present invention includes a natural rubber containing the Soviet Union by the above-mentioned natural rubber Soviet Union method as a raw material rubber, a rubber containing a tire made of a tire tread rubber composition containing such raw rubber.

The present invention includes a natural rubber containing the Soviet Union by the above-mentioned natural rubber Soviet Union method as a raw material rubber, a tire containing a rubber made of a tire tread rubber composition containing such raw rubber as a tread.

In the tire containing the rubber made of the tire tread rubber composition, the tire represents any one selected from passenger car tires, truck tires, bus tires, motorcycle tires, and aircraft tires.

Hereinafter, the present invention will be described in more detail by the following examples, comparative examples, and test examples. However, these are only one example for describing the present invention, and the scope of the present invention is not limited thereto.

<Example 1>

100 parts by weight of natural rubber in Banbury mix and 0.15 parts by weight of alkylphenol disulfide as a complexing agent were added and a mixture was stirred for 4 minutes at 50 rpm.

The alkylphenol disulfide used methyl phenol disulfide which has an alkyl group of 1 carbon number.

Comparative Example 1

100 parts by weight of natural rubber in Banbury mixie and 0.15 parts by weight of 2-2'-dibenzamido-diphenyl-disulfide as a complexing agent were added and stirred at 50 rpm for 4 minutes. Carried out the Soviet Union of mixing.

<Test Example 1>

The viscosity before and after each Soviet process carried out in Example 1 and Comparative Example 1, the viscosity after 5 days left at room temperature after the Soviet Union was measured and the results are shown in Table 1 below.

3. Comparison of viscosity before and after Soviet Union and viscosity change after ice age

Item Comparative example Example Soviet War 88 88 Post-Soviet 80 80 Viscosity after 5 days at room temperature 82 80

* Viscosity measurement condition: ML (1 + 4) @ 100 ℃

As shown in Table 1, even if the Soviet natural rubber in Example 1 of the present invention is left at room temperature for 5 days, no increase in viscosity occurs, indicating that the Soviet characteristics are excellent.

<Example 2>

In Example 1, the raw material rubber used in the USSR was used as a raw material rubber, 50 parts by weight of carbon black, 3.5 parts by weight of zinc oxide (ZnO), 4 parts by weight of stearic acid, and an anti-aging agent based on 100 parts by weight of the raw material rubber. 4 parts by weight of 2,2,4-trimethyl-1,2-dihydroquinoline (RD), 2 parts by weight of wax, and 0.1 parts by weight of scorch retardant (PVI) were mixed in a Banbury mixer to obtain a rubber compound.

1.5 parts by weight of sulfur as a vulcanizing agent and 1.05 parts by weight of vulcanization accelerator (N-cyclohexyl-2-benzothiazolsulfen amide, CZ) were added to the rubber compound, and the mixture was vulcanized at 160 ° C. for 30 minutes to prepare a rubber specimen.

Table 2 summarizes the composition of the rubber component.

Comparative Example 2

A rubber specimen was manufactured in the same manner as in Example 2, except that the natural rubber used in Comparative Example 1 was used as the raw rubber.

Table 2. Rubber composition of Example 2 and Comparative Example 2 (unit: parts by weight)

Item Comparative Example 2 Example 2 Comparative Example 1 Rubber 100 - Example 1 Rubber - 100 Zinc oxide 3.5 3.5 Carbon black 50 50 Stearic acid 4 4 Anti-aging 3 3 Wax 2 2 Scorch Retardant (PVI) 0.1 0.1 Vulcanization accelerator 1.05 1.05 brimstone 1.5 1.5

<Test Example 2>

Tensile properties, such as hardness, tensile strength, 300% modulus, elongation, tensile strength, viscosity, scotch time, wear (DIN wear, etc.) of the rubber specimens prepared in Examples 2 and Comparative Example 2 according to ASTM-related regulations PICO wear) and blow out were measured and the results are shown in Table 3 below.

Table 3. Rubber Properties of Example 2 and Comparative Example 2

Item Comparative Example 2 Example 2 Remarks Viscosity 70 70 ML (1 + 4) @ 100 ° C Scotch Time 25.1 30.3 minute Hardness 63 63 Shore a 300% modulus 96 97 kg / cm ² The tensile strength 281 286 kg / cm ² Elongation 610 618 % DIN wear 74 72 mg PICO Wear Amount 25.5 22.5 mg Blow out 11.3 14.3 minute

As shown in the results of Table 3, the rubber specimen using the natural rubber made by the Soviet Union method of the natural rubber of the present invention as the raw material rubber is improved in tensile properties and wear resistance compared to the rubber specimen using the rubber of the comparative example made by using the conventional complexing agent. And it was found.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated that it can be changed.

Claims (5)

Natural rubber in the USSR, A natural rubber USSR method characterized in that the addition of 0.01 to 5 parts by weight of alkylphenol disulfide as a dissolving agent to 100 parts by weight of natural rubber to perform the Soviet Union (mastication). In the alkylphenol disulfide, the alkyl group is an alkyl group having 1 to 10 carbon atoms. The method of claim 1, wherein the Soviet Union of natural rubber is a natural rubber USSR method characterized in that the natural rubber and the decanting agent is added to the compounding machine for 10 minutes at 10 to 100 rpm. In the tire tread rubber composition, Tire tread rubber composition, characterized in that it comprises the natural rubber of the Soviet Union according to claim 1. The method according to claim 3, wherein silica, carbon black, calcium carbonate, clay, talc, mica, illite, kaolin, tourmaline, elvan, amethyst, ocher, syndiotactic-1,2- A tire tread rubber composition comprising 10 to 80 parts by weight of any one or more selected from polybutadiene. A tire comprising a rubber comprising the rubber composition of claim 3.