Rubber compositions and method for increasing the mooney scorch value

A rubber composition and rubber technology, applied in the field of rubber composition and Mooney scorch value, can solve the problems of reducing processing time, batching, rough surface, reducing processing time, etc., and achieve the effect of long rubber processing time

Inactive Publication Date: 2003-08-06
UNIROYAL CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the use of these secondary accelerators, especially DPG, generally results in rubber compositions having low Mooney Scorch values ​​during their manufacture, thereby resulting in reduced processing times
Issues associated with reduced processing times include, for example, premature vulcanization of the compound and rough surfaces on extruded parts
In addition, diphenylguanidine is often used in high amounts, resulting in rubber compositions that are more expensive to manufacture because more material is used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4 and comparative example A

[0039] Using the ingredients given in Tables II and III (given in parts per 100 parts by weight rubber), several rubber compositions were compounded in the following manner: The ingredients given in Table II were added to the internal mixer And mixed until the material is included and fully dispersed, discharged from the activator, the discharge temperature is usually 160 ° C. The batch was cooled and recharged to the internal mixer with the ingredients given in Table III. The second pass is shorter and the discharge temperature is typically 93 to 105°C.

[0040] Table II - Phase I Example or Comparative Example 1 2 3 4 A Solflex 1216 1 75.00 75.00 75.00 75.00 75.00 Budene 1207 2 25.00 25.00 25.00 25.00 25.00N234 3 32.00 32.00 32.00 32.00 32.00 Zeosil 1165 4 44.00 44.00 44.00 44.00 44.00Si69 5 3.52 3.52 3.52 3.52 3.52 Sundex 8125 6 32.50 32.50 32.50 32.50 32.50 Stearic Acid 1.00 1.00 1....

Embodiment 2

[0049] The Mooney Scorch value of Example 2 is also significantly higher than that of Comparative Example A. The 100% and 300% modulus and 1% elongation of Example 2 are comparable to those of Comparative Example A. Therefore, by using 0.25 phr tetraalkyl disulfide (C 12 -C 14 By replacing 1 phr of diphenylguanidine with )thiuram, the scorch safety of the rubber composition is significantly improved without any sacrifice in physical properties, thereby achieving an economical cost advantage.

[0050] Examples 3 and 4 also provide significantly higher Mooney Scorch values ​​than Comparative Example A. The 100% and 300% modulus and 1% elongation of Examples 3 and 4 are comparable to those of Comparative Example A. Thus, by substituting a small amount of tetrabenzylthiuram disulfide for 1 phr of diphenylguanidine, the scorch safety of the rubber composition is significantly improved without any sacrifice in physical properties, thereby achieving an economical cost advantage.

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Abstract

A rubber composition is disclosed wherein the rubber composition contains at least (a) a rubber component; (b) a silica filler; and, (c) at least one thiuram disulfide accelerator, it being provided that diphenyl guanidine is substantially absent in the rubber composition. The compositions may also include suitable amounts of other ingredients such as carbon black, coupling agents, antiozonants, antioxidants, etc.

Description

Background of the invention [0001] The present invention relates generally to rubber compositions and methods of increasing the Mooney Scorch of rubber compositions. More particularly, the rubber compositions described herein include at least one of (a) a rubber component; (b) a silica filler; and (c) at least one thiuram disulfide accelerator that enhances silica-related properties . The rubber composition is particularly useful in tire tread applications for vehicles such as passenger cars and trucks. [0002] The treads of modern tires must meet performance standards requiring a wide range of suitable properties. Therefore, a rubber composition suitable for use, for example, in tire treads should not only exhibit the desired strength and elongation, especially at high temperatures, but also good crack resistance, good abrasion resistance, suitable skid resistance and Low tan delta values ​​at low frequencies against rolling. Furthermore, a high composite dynamic modulus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/00C08K3/04C08K3/36C08K5/40C08K5/54C08L7/00C08L9/00
CPCC08K5/40C08K3/36C08L21/00
Inventor M·J·汉诺恩洪性徽R·J·康奈尔
Owner UNIROYAL CHEM CO INC
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