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Modified natural rubber, method for producing same, rubber composition, and pneumatic tire

一种天然橡胶、天然胶乳的技术，应用在特殊轮胎、轮胎零部件、滚动阻力优化等方向，能够解决降低tanδ、未达到充分、未达到充分的水平等问题，达到低油耗性、耐磨耗性良好、tanδ降低的效果

Active Publication Date: 2013-01-23
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in these methods, although the protein and gel content can be reduced to a certain extent, it is far from reaching a sufficient level. Usually, after the deproteinization is processed, although the protein can be reduced, it is especially important for the components that are considered to be contained in natural rubber. Phospholipids, one of the causes of gel formation, cannot be sufficiently removed
[0005] In addition, although these methods can reduce protein and gel fractions to a certain extent, they are far from reaching a sufficient level, and it is desired to further reduce tanδ
In addition, particularly tires require durability such as wear resistance, but it is generally difficult to achieve both low fuel consumption and durability

Method used

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  • Modified natural rubber, method for producing same, rubber composition, and pneumatic tire
  • Modified natural rubber, method for producing same, rubber composition, and pneumatic tire
  • Modified natural rubber, method for producing same, rubber composition, and pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] After adjusting the solid content concentration (DRC) of natural latex to 30% (w / v), relative to natural latex 1000g, add Emal-E10g and NaOH20g, carry out saponification reaction at room temperature for 48 hours, obtain saponified natural latex. Water was added to this latex to dilute it to DRC 15% (w / v), and then formic acid was added while stirring gently to adjust the pH to 4.0 to 4.5 to allow aggregation. The agglomerated rubber was treated with a hammer mill manufactured by Natural Laber-Machine And Iquipment Co., Ltd., and then pulverized (crushed) by a rubber granulator. The average aggregate diameter of the pulverized aggregates (aggregated rubber) was 5 mm.

[0153] Next, washing treatment of the pulverized aggregate (aggregated rubber) is performed. In this cleaning treatment, first, 1000 ml of water was added to the pulverized aggregate (aggregated rubber), stirred for 10 minutes, and the rubber fraction was suspended in water, and then left to stand for 60 ...

Embodiment 2～5

[0155] A solid rubber (modified natural rubber) was obtained by the same method as in Example 1 except for the number of cleaning treatments. In addition, the average aggregate diameter of the pulverized aggregates (aggregated rubber) obtained in Examples 2 to 5 was 5 mm.

Embodiment 6

[0157] After adjusting the solid content concentration (DRC) of natural latex to 30% (w / v), relative to natural latex 1000g, add Emal-E10g and NaOH20g, carry out saponification reaction at room temperature for 48 hours, obtain saponified natural latex. Water was added to this latex, and after diluting to DRC15% (w / v), formic acid was added, stirring gently, and pH was adjusted to 4.0-4.5. Then, after adjusting the pH, 1 g of a polymer coagulant (Aronfluck C312) was added as a 0.1% solution while stirring, to cause aggregation.

[0158] Next, the cleaning treatment of aggregates (agglomerated rubber) was performed by the same method as in Example 1. After repeating this washing process four times, it was dried at 110° C. for 2 hours to obtain a solid rubber (modified natural rubber).

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Abstract

Disclosed are a modified natural rubber having a reduced tan d, a method for producing the modified natural rubber, a rubber composition comprising the modified natural rubber, and a pneumatic tire comprising the rubber composition. Further disclosed are a modified natural rubber having a reduced tan d, a method for producing the modified natural rubber, a rubber composition comprising the modified natural rubber and achieving both fuel efficiency and abrasion resistance, and a pneumatic tire comprising the rubber composition. The modified natural rubber has a phosphorus content of 200 ppm or less and a total content of sodium and potassium of 350 ppm or less. Further, the modified natural rubber has a phosphorus content of 200 ppm or less and a nitrogen content of 0.2 mass% or less.

Description

technical field [0001] The present invention relates to modified natural rubber, a method for producing the modified natural rubber, a rubber composition using the modified natural rubber, and a pneumatic tire using the rubber composition. Background technique [0002] Natural rubber is used in many fields, from industrial goods such as tires, belts, and rollers to sporting goods such as tennis balls. Generally, rubber products are repeatedly compressed-recovered-elongated during use, and energy is lost and heat is generated. Heat will promote rubber fatigue and shorten the life of rubber products. The greater the energy loss represented by the loss tangent value tanδ, the greater the above-mentioned heat generation. In addition, in the case of tires, for example, the rolling resistance is empirically determined by the magnitude of tan δ at 50 to 70°C. If tan δ is large, not only heat generation increases, rolling resistance also increases, and there is a problem that the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C1/04B60C1/00C08K3/06C08K5/14C08K5/40C08L7/00
CPCY02T10/862C08C1/04B60C1/0025B60C1/0016C08L15/00C08C3/02C08J2307/02Y02T10/86
Inventor 市川直哉榊俊明L·塔拉基温K·卡恩亚娃拉拉克
Owner SUMITOMO RUBBER IND LTD