Nitrile rubber/modified silica-gel powder blend and preparation method thereof

A technology of nitrile rubber and silica gel powder, which is applied in the field of nitrile rubber/modified silica gel powder blend and its preparation, can solve the problems that the modification effect of silica gel powder is not obvious, and the molecular structure and chemical properties of silica gel powder are changed. , to achieve the effect of small mechanical properties, improved low temperature resistance, high temperature resistance and excellent aging resistance

Inactive Publication Date: 2014-03-19
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of modifiers such as hexamethylenetetramine and ferric chloride/ferrous chloride can only adsorb some active groups on the surface of silica gel powder. This modification method was mainly used for the modification of tire waste rubber powder in the past. St

Method used

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  • Nitrile rubber/modified silica-gel powder blend and preparation method thereof
  • Nitrile rubber/modified silica-gel powder blend and preparation method thereof
  • Nitrile rubber/modified silica-gel powder blend and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029]

[0030]In the formula of Example 1, the nitrile rubber was first masticated in an open mill or an internal mixer for 3 minutes, zinc oxide, stearic acid and precipitated silica were added, and finally sulfur and tetrabenzyl thiuram disulfide were added. Mum, N-tert-butyl-2-benzothiazole sulfenamide and 2,5-dimethyl-2,5-(di-tert-butyl) peroxyhexane, the mixing temperature was controlled at 40°C, and the mixing The time is 15 minutes. Then, the above obtained blend was placed in a flat vulcanizer for molding, and the vulcanization temperature was controlled at 200° C. and the vulcanization time was 10 minutes.

[0031] The properties of the obtained pure nitrile rubber compound without silica gel powder are shown in Table 1.

Example Embodiment

[0032] Example 2

[0033]

[0034] In the formula of Example 2, in parts by weight, first place 100 parts of 100-mesh silica gel powder in an internal mixer or Hack rheometer, add 0.5 parts of dibenzoyl peroxide and 5 parts of maleic anhydride, Heating to 80° C., shearing and mixing for 25 minutes to obtain maleic anhydride modified silica gel powder.

[0035] The nitrile rubber is masticated in an open mill or an internal mixer for 3 minutes, zinc oxide, stearic acid and precipitated silica are added, then modified silica gel powder is added, and finally sulfur and tetrabenzylthiuram disulfide are added. , N-tert-butyl-2-benzothiazole sulfenamide, 2,5-dimethyl-2,5-(di-tert-butyl) peroxyhexane, the mixing temperature was controlled at 40°C, and the mixing time was for 30 minutes. Then, the obtained blend was placed in a flat vulcanizer for molding, and the vulcanization temperature was 200° C. and the vulcanization time was 10 minutes.

[0036] The properties of the obta...

Example Embodiment

[0037] Example 3

[0038]

[0039]

[0040] In the formula of Example 3, in parts by weight, first place 100 parts of 100-mesh silica gel powder in an internal mixer or Hack rheometer, add 1.0 parts of dibenzoyl peroxide and 5 parts of maleic anhydride, Heating to 80° C., shearing and mixing for 25 minutes to obtain maleic anhydride modified silica gel powder.

[0041] First, the nitrile rubber is masticated in an open mill or an internal mixer for 3 minutes, then zinc oxide, stearic acid and precipitated silica are added, then modified silica gel powder is added, and finally sulfur and tetrabenzyl thiuram disulfide are added. Mu, N-tert-butyl-2-benzothiazole sulfenamide, 2,5-dimethyl-2,5-(di-tert-butyl) peroxyhexane, the kneading temperature was controlled at 40°C, kneading The time is 25 minutes. Then, the above-obtained blend was placed in a flat-plate vulcanizer for molding, and the vulcanization temperature was 150° C. and the vulcanization time was 30 minutes.

...

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Abstract

The invention provides a nitrile rubber/modified silica-gel powder blend and preparation method thereof. The method comprises the following steps: adding nitrile rubble in an open mill or internal mixer; plasticating for 3-5 minutes; adding zinc oxide, eleaostearic acid, deposited white carbon black, modified silica-gel powder, sulfur, promoter and peroxide; carrying out mixing and milling at 40-60 DEG C, and obtaining the nitrile rubber/modified silica-gel powder blend; the promoter is tetrabenzylthiuramdisulfide and N-t butyl-2-benzothiazolesulfenamide; compression molding of the blend is carried out in a flat vulcanizer, and the vulcanizing temperature is 150-200 DEG C, and the vulcanizing time is 10-30 minutes, and the nitrile rubber/modified silica-gel powder blended vulcanized rubber is prepared. The blended vulcanizied rubber has the advantages of good low temperature resistance, high temperature resistance and higher fracture elongation rate. The invention can improve regeneration utilization rate of wasted silicone rubber, extend application range of silica-gel powder, and the invention has the advantages of simple processing technology, low production cost and good economic benefit.

Description

technical field [0001] The present invention relates to the graft modification of silicone rubber powder, particularly relate to a kind of nitrile rubber / modified silica gel powder blend and preparation method thereof, this nitrile rubber / modified silica gel powder blend can be used as in Various mechanical seal materials and damping and shock absorbing materials used in environments with large high and low temperature changes. Background technique [0002] Silicone rubber is a synthetic rubber with high and low temperature resistance, weather resistance, insulation, non-toxic environmental protection and physiological inertia. It is widely used in the fields of electronics, aerospace, automotive machinery, medical and health care, etc. In the production process of silicone rubber products, a large amount of silicone rubber vulcanized rubber scraps and waste products will be produced, and a large number of waste silicone rubber products such as various silicone rubber gasket...

Claims

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Application Information

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IPC IPC(8): C08L9/02C08L51/08C08K13/02C08K3/36C08K3/22C08K5/09C08K3/06C08K5/40C08K5/47C08K5/14C08F283/12C08F222/06C08F220/44
Inventor 郭建华李函坚许传臻顾京生
Owner SOUTH CHINA UNIV OF TECH
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