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High-scorch-resistance peroxide curing system rubber composition and preparation method thereof

A technology of rubber composition and peroxide, which is applied in the field of rubber, can solve the problems of affecting the vulcanization and molding of rubber materials, the rapid decline of tensile strength, and the inability to effectively prolong the scorch time of rubber materials, so as to reduce energy consumption and improve production efficiency Effect

Inactive Publication Date: 2015-06-24
GUANGDONG SUNLITE MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principles of the two patents are the same. When free radicals are eliminated, crosslinking aids are added at the same time, but it cannot effectively prolong the scorch time of the rubber compound. The high temperature residence time of the mixed rubber is long, and the free radicals decomposed by the peroxide Eliminated by the anti-scorch agent, which seriously affects the subsequent vulcanization and molding of rubber materials
Moreover, according to literature reports, the increase of the added amount of the cross-linking agent will significantly increase the hardness of the vulcanizate, the tensile strength will decrease rapidly, and the mechanical properties of hot air aging will deteriorate [1]

Method used

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  • High-scorch-resistance peroxide curing system rubber composition and preparation method thereof
  • High-scorch-resistance peroxide curing system rubber composition and preparation method thereof
  • High-scorch-resistance peroxide curing system rubber composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Formula is by weight:

[0025] EPDM: 100 phr;

[0026] Antiaging agent RD (2,2,4-trimethyl-1,2-dihydroquinoline polymer): 1.0 phr;

[0027] Carbon black and light calcium carbonate: 40 phr;

[0028] Paraffin oil: 10 phr;

[0029] Cross-linking agent BPO (dibenzoyl peroxide): 1.0 phr;

[0030] Anti-scorch agent: 1,1-diphenyl-2-pichydrazine 0.05 phr.

[0031] The above formula was prepared as a rubber composition sample according to the following process, and the performance was tested.

[0032] Step 1: Turn on the open mill or internal mixer, add rubber first, then add anti-aging agent, add fillers and plasticizers after 2 minutes of refining, 3-5 minutes of refining, release the tablets and park for 12 hours;

[0033] Step 2: Turn on the open mill or internal mixer, control the temperature at 50-80°C, soften the rubber obtained in the first step for 1 minute, add crosslinking agent and anti-scorch agent to refine for 3 minutes, and then beat After 5 times of t...

Embodiment 2

[0036] Formula is by weight:

[0037] EPDM: 100 phr;

[0038] Antiaging agent RD: 1.0 phr;

[0039] Carbon black and light calcium carbonate: 40 phr;

[0040] Paraffin oil: 10 phr;

[0041] Cross-linking agent BPO1.0 phr;

[0042] Anti-scorch agent: 2,2,6,6-tetramethylpiperidine nitrogen oxide 0.25 phr.

[0043] The above formula was prepared as a rubber composition sample according to the process of Example 1, and the performance was tested.

Embodiment 3

[0045] Formula is by weight:

[0046] EPDM: 100 phr;

[0047] Antiaging agent RD: 1.0 phr;

[0048] Carbon black and light calcium carbonate: 40 phr;

[0049] Paraffin oil: 10 phr;

[0050] Cross-linking agent BPO: 1.0 phr;

[0051] Anti-scorch agent: tert-butylcatechol 0.5 phr.

[0052] The above formula was prepared as a rubber composition sample according to the process of Example 1, and the performance was tested.

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PUM

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Abstract

The invention discloses a high-scorch-resistance peroxide curing system rubber composition and a preparation method thereof. According to the method, a radical activity regulation technology is utilized, an anti-scorching agent is added in the formula of a peroxide curing system to regulate the radical activity generated in decomposition of peroxide in the system, the effects of preventing occurrence of rubber crosslinking reaction at low temperature and promoting or not influencing rubber crosslinking reaction at high temperature can be achieved, excellent scorch resistance is achieved, and the mechanical performance of rubber is not influenced. The rubber composition prepared by the method has excellent scorch resistance and high mechanical performance retention rate, is simple and efficient, and is easy to operate, little in usage of the anti-scorching agent and low in cost. The prepared rubber composition peroxide is cured.

Description

technical field [0001] The invention relates to the field of rubber, in particular to a high-scorch-resistant peroxide vulcanization rubber composition and a preparation method thereof. technical background [0002] In the use of rubber, general materials require rubber with good heat resistance. Usually, rubber types such as EPDM rubber and nitrile rubber are selected for formula design, and sulfur vulcanization system and peroxide vulcanization system are selected for the vulcanization system. A lot of practice and literature have proved that the peroxide vulcanization system for rubber compounds has better aging resistance, low compression deformation, no vulcanization reversion, no blooming phenomenon, and simple formula design than the sulfur vulcanization system. [0003] However, there are still some deficiencies in the formulation design process of rubber using peroxide vulcanization system, which hinders its application range. Compared with the sulfur vulca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L23/16C08L9/06C08L9/02C08K13/02C08K5/24C08K5/3435C08K5/13C08K5/098C08K5/14
CPCC08L23/16C08K3/346C08K3/36C08K5/12C08K5/14C08K5/3435C08K13/02C08L9/06C08L91/06C08K3/04C08K2003/265C08K5/24C08K5/13C08K5/098C08K3/34C08L9/02
Inventor 龚湛林岑兰于日志陈伟燕曹焕仁
Owner GUANGDONG SUNLITE MATERIAL SCI & TECH
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