Filler for clear rubber

A filling material and transparent rubber technology, which is applied in the field of transparent rubber filling materials, can solve the problems of poor rubber strength, transparent rubber transparency, and weak hardness of transparent rubber.

Active Publication Date: 2005-03-16
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rubber components such as BR and S-SBR used as transparent rubber, especially BR, are generally weaker than other rubbers using wet silica as a filler, and are difficult to shear during kneading. When silicon is used as a filler, the silicon dioxide cannot be completely dispersed by a wet method, and the transparency of the obtained transparent rubber is significantly reduced, resulting in a problem of no commercial value.
In addition, rubber strength such as abrasion resistance of transparent rubber is poor
[0008] As a method to solve the above-mentioned problems, it is considered that the dispersibility in rubber can be improved by pulverizing wet silica very finely, but a large pulverizing device and a lot of labor are required, which is not only uneconomical, but also has a high Cohesive, not perfect
In addition, due to the fine powder, there is a problem that the handling property of the powder is deteriorated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Water 180L and sodium silicate solution 7L (commercially available sodium silicate solution: SiO 2 / Na 2 O=3.32) into 1m 3 In the reaction tank, the temperature of the aqueous solution was adjusted to 92°C while stirring. Next, while maintaining the liquid temperature at 92°C, add sodium silicate at a ratio of 3.1L / min and 22% sulfuric acid at a rate of 0.49L / min for 40 minutes, stop the input of sodium silicate and sulfuric acid once, and keep the temperature at 90°C Stir only for 30 minutes. After 30 minutes, sodium silicate and sulfuric acid were started to be added again, and sodium silicate and sulfuric acid were finally added for a total of 105 minutes.

[0093] Thereafter, the input of sodium silicate was stopped, only sulfuric acid was added until the pH value of the reaction solution was 3.5, and the reaction was terminated. Next, the reaction solution was completely filtered with a filter press until the conductivity of the product was 41 μS. After washing...

Embodiment 2

[0097] Mix 180L of water and 7L of sodium silicate solution in advance (commercially available sodium silicate solution: SiO 2 / Na 2 O=3.32) into 1m 3 In the reaction tank, the temperature of the aqueous solution was adjusted to 92°C while stirring. Then, while keeping the liquid temperature at 89°C, the ratio of 3.1 L / min of sodium silicate and 0.49 L / min of 22% sulfuric acid was dropped into for 115 minutes, during which, the input was carried out continuously.

[0098] Thereafter, the input of sodium silicate was stopped, and only sulfuric acid was added until the pH value of the reaction solution was 3.3 to terminate the reaction.

[0099] Next, in the same manner as in Example 1, the reaction solution was completely filtered with a filter press and washed with water. Thereafter, the filter cake was dried, pulverized, and classified to obtain wet silica shown in Table 2.

[0100] Using the thus obtained wet silica, transparent rubber was produced in the same manner as ...

Embodiment 3

[0103] Water 180L and sodium silicate solution 6L (commercially available sodium silicate solution: SiO 2 / Na 2 O=3.29) into 1m 3 In the reaction tank, the temperature of the aqueous solution was adjusted to 92°C while stirring. Then, while keeping the liquid temperature at 95°C, add 3.8L / min of sodium silicate and 0.49L / min of 21% sulfuric acid for 40 minutes. °C, while only stirring for 60 minutes. After 60 minutes, sodium silicate and sulfuric acid were started to be added again, and sodium silicate and sulfuric acid were finally added for a total of 130 minutes.

[0104] Thereafter, the feeding of sodium silicate was stopped, and only sulfuric acid was added until the pH of the reaction liquid was 3.5, and the reaction was terminated. Next, the reaction solution was completely filtered with a filter press until the conductivity of the product was 36 μS. After washing with water, the filter cake was dried, then pulverized and classified to obtain the wet silica shown in...

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Abstract

Provided is a filler for a clear rubber, which can be handled easily and comprises a wet type silica giving excellent transparency and abrasion resistance to the clear rubber prepared. The filler for the clear rubber comprises the wet type silica having a specific surface area of 100-250m<2> / g, a ratio (V / S) of an oil absorption (V;cc / 100g) to the specific surface area (S;m<2> / g) of not less than 1.05 and an average particle diameter of 5-10[mu]m. One hundred pts.wt. of a rubber component consisting of a butadiene rubber and a styrene-butadiene rubber of a solution-polymerizing type as major components is incorporated with 20-50 pts.wt. of the above filler comprising the wet type silica. The clear rubber with a thickness of 2 mm exhibits a total light transmission rate of 70% or more.

Description

technical field [0001] The present invention relates to a novel filler material for transparent rubber composed of wet silica. More specifically, the present invention relates to a filler for transparent rubber composed of wet-type silica, which is good in handleability when used as a filler for transparent rubber, and the obtained transparent rubber is excellent in transparency and abrasion resistance. Background technique [0002] Transparent rubber is made by mixing high-transparency unvulcanized rubber, such as BR (butadiene rubber) and S-SBR (solution polymerization styrene butadiene rubber) as the main component, with fillers for reinforcement. , Vulcanized transparent vulcanized rubber. Various uses are expected as a pattern-imparting material and a functional material. [0003] As one of the uses of transparent rubber, there is a use as a shoe sole. In such applications, transparent rubber is generally used to concentrating on the sole to give a pattern. In recen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00C08K3/36C08L9/06
CPCC08K3/013C08K3/36C08L9/00C08L9/06C08L25/10
Inventor 外池弘
Owner TOKUYAMA CORP
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