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Modified powdery rubber and its preparation method

A powder rubber and modification technology, which is applied in the field of polymers, can solve the problems of small particle size of fully vulcanized powder rubber, lower fluidity of powder rubber at room temperature, and yellowing of appearance color, so as to improve fluidity at room temperature and anti-aging performance , The effect of improving mechanical properties

Active Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, some of the above-mentioned powdered rubber varieties will undergo rubber aging under the action of light, heat, catalyst residues and other factors. After aging, the elasticity of the rubber particles will become poor and the appearance will turn yellow.
Although the raw material emulsion of fully vulcanized powder rubber contains a small amount of antioxidant or anti-aging agent, due to the small particle size and large specific surface area of ​​fully vulcanized powder rubber, aging and discoloration will occur if the storage time is too long during storage, and Affects the free-flowing properties of the powder
In addition, when the amount of rubber is high, there will still be some agglomeration and uneven dispersion of fully vulcanized powder rubber in the matrix resin
[0004] The use of liquid antioxidants to modify powder rubber can significantly improve the anti-aging performance of the original powder rubber, prolong the storage time of powder rubber and the problem of discoloration after long-term storage, and make the powder rubber dispersed in the matrix resin. The performance has also been better improved, but when the liquid antioxidant is used to modify the powder rubber, when the liquid antioxidant is mixed with the solid powder rubber, a small amount of liquid antioxidant is difficult to disperse evenly in the powder rubber, and with the liquid antioxidant If the amount of oxygen added increases, the normal temperature fluidity of the modified powder rubber will decrease, which is not conducive to its post-molding processing

Method used

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  • Modified powdery rubber and its preparation method
  • Modified powdery rubber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0020] The low melting point antioxidant AT-76 [melting point 49 ~ 54 ° C] (β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, Jinhai Yabao) and DLTP [ Melting point 38~41 ℃] (dilauryl thiodipropionate, Jinhai Yabao) and superfine fully vulcanized nitrile powder rubber (brand VP-401, acrylonitrile content is 26%, gel content is 93% by weight, The average particle size is 150nm, produced by Beijing Beihuayan Chemical New Technology Co., Ltd.) directly into the high-speed mixer (model GH-10DY, produced by Beijing Yingte Plastic Machinery General Factory), and first stirred and mixed evenly at a temperature lower than 38°C , and then raise the temperature to above 60°C and continue mixing for 10 minutes (the temperature of the material is controlled at 60-70°C), stop stirring, discharge, and cool to room temperature to obtain 1#~7# modified powdered nitrile rubber samples. The specific formula is shown in Table 1, wherein the content of each component is calculated in pa...

Embodiment 8

[0022] In addition to replacing the ultrafine fully vulcanized powdered nitrile rubber with ultrafine fully vulcanized powdered styrene-butadiene rubber (brand VP-101, the butadiene content is 50%, the gel content is 93% by weight, and the average particle size is 150nm, Beijing Beihuayan Chemical New Technology Co., Ltd.) with low melting point antioxidant AT-76 (β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, Jinhai Yabao) and Except that DLTP (dilauryl thiodipropionate, Jinhai Yabao) was mixed, the rest was the same as in Example 1, and the 8# modified powdered styrene-butadiene rubber sample was obtained through mixing. The specific formula is shown in Table 1, wherein the content of each component is calculated in parts by weight.

Embodiment 9

[0024]The low melting point antioxidant AT-76 [melting point 49 ~ 54 ° C] (β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, Jinhai Yabao) and DSTP ( β, β'-thiodipropionate distearate) [melting point 64 ~ 67 ℃] and superfine fully vulcanized nitrile powder rubber (brand VP-401, acrylonitrile content of 26%, gel content of 93 % weight, average particle size is 150nm, produced by Beijing Beihuayan Chemical New Technology Co., Ltd.) directly into the high-speed mixer (model GH-10DY, produced by Beijing Yingte Plastic Machinery General Factory), first at a temperature lower than 49 ° C Stir and mix evenly, then raise the temperature to above 67°C and continue mixing for 10 minutes (the temperature of the material is controlled at 67-70°C), stop stirring, discharge, and cool to room temperature to obtain 9# modified powdered nitrile rubber sample. The specific formula is shown in Table 1, wherein the content of each component is calculated in parts by weight.

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Abstract

The invention discloses a modified powdery rubber and its preparation method. The modified powdery rubber comprises 100 parts by weight of a powdery rubber and 0.1-20 parts by weight of a low-melting-point antioxidant, wherein the average particle size of the particles of the powdery rubber is 20-2000nm, and the gel content of the powdery rubber is 60wt% or more; and the low-melting-point antioxidant comprises one or more of a hindered phenol antioxidant, a phosphite antioxidant, a thioester antioxidant and an amine antioxidant. The preparation method comprises the following steps: uniformly mixing the low-melting-point antioxidant with the powdery rubber at a temperature lower than the melting point of the low-melting-point antioxidant, and then mixing at a temperature more than the melting point until the low-melting-point antioxidant is fully absorbed by the powdery rubber to prepare the modified powdery rubber. The preparation method obviously improves the ageing resistance of the original powdery rubber, prolongs the storage time of the powdery rubber, delays the color change appearing after long-time storage, and obviously improves the mechanical performances of a modified powdery rubber added resin matrix.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a modified powder rubber and a preparation method thereof. Background technique [0002] Adding radiation cross-linking aids to the rubber emulsion, followed by gamma-ray or electron beam irradiation cross-linking and spray drying, can obtain a series of fully vulcanized powder rubbers with a particle size of 20-2000nm. See US Patent US6243760B1, Chinese Patents CN1330097A, CN1402752A. The currently developed varieties include fully vulcanized powdered styrene butadiene rubber, fully vulcanized powdered carboxylated styrene butadiene rubber, fully vulcanized powdered natural rubber, fully vulcanized powdered polybutadiene rubber, fully vulcanized powdered acrylate rubber, fully vulcanized powdered nitrile rubber, Fully vulcanized powdered carboxylated nitrile rubber, fully vulcanized powdered silicone rubber, fully vulcanized powdered Pyrylene rubber and fully vulcanized powdered n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L9/06C08L13/00C08L9/02C08L9/00C08L11/00C08L83/04C08L33/04C08K5/134C08K5/372
Inventor 潘国元刘轶群郭敏乔金樑
Owner CHINA PETROLEUM & CHEM CORP