Method for decreasing acrylic ester rubber glass-transition temperature

A technology of glass transition and acrylate, which is applied in the field of emulsion graft polymerization to reduce the glass transition temperature of acrylate rubber, which can solve problems such as being dissolved by lubricating oil, achieve good compatibility, soften acrylate rubber, and improve processing flow sexual effect

Inactive Publication Date: 2004-12-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemically graft low-molecular weight polyester, polyether and acrylate polymer main chain to form graft copolymer to solve the combination and compatibility of polyether, polyester and acrylate polymer, as well as the dissolution by lubricating oil during use The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Get 207.5g of butyl acrylate, 37.5g of ethyl acrylate, 5g of glycidyl methacrylate, 0.025g of tertiary dodecyl mercaptan, and 6.25g of polybutylene adipate to obtain a monomer mixed solution; Add 400ml of deionized water, dissolve 2.5g of sodium lauryl sulfate, 2.5g of OP-10, 0.5g of sodium dihydrogen phosphate, and 0.25g of disodium edetate in deionized water, and then dissolve 25% of mono The solid mixed solution was added dropwise to the reactor under stirring, and nitrogen N 2 , continue to stir and emulsify for 30 minutes; raise the temperature to 60°C, add the initiator dropwise, and add the remaining monomer mixed solution dropwise after the polymerization is initiated, and control the addition of the remaining monomer and the remaining initiator within 1 hour; keep warm at 60 Continue to react at ℃ for 2 hours; use 2% CaCl 2 The aqueous solution was demulsified at 60°C, washed with water, and dried to obtain an acrylate copolymer elastomer (raw rubber). The gra...

example A

[0035] Example A of the present invention Comparative sample A' (does not contain polyester)

[0036] Mooney viscosity (M 1+4 100□1 ) 21 21

[0037] Curing time (min) 36 32

[0038] Tear strength (Mpa) 10.98 11.2

[0039] Elongation at break (%) 300 308

[0040] 100% Modulus of Elongation (MPa) 2.9 3.8

[0041] Shore A hardness (degrees) 60 65

[0042] Heat resistance (150℃×70h

[0043] hot air aging)

[0044] Change rate of breaking strength (%) -8 -7.8

[0045] Hardness change (degrees) +4 +5

[0046] Oil resistance (gear oil, +17.7 +13.8

[0047] 150℃×70 hours) body

[0048] Plot rate of change (%)

[0049] glass transition temperature

[0050] -49.7 -44.6

[0051] Tg(°C)

[0052] Note: The vulcanization conditions are: one stage vulcanization 170℃×36min, two stage vulcanization 150℃×4h

Embodiment 2-4

[0054] Listed by table 4, the polybutylene adipate in the polymerization system of embodiment 1 is replaced with the polyester listed in table 2, and other components and technology are constant:

[0055] Example 2

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Abstract

A process for lowering the vitrifying temp of acrylate rubber features that the emulsion of acrylate rubber is grafted by acrylate and low-molecular polyester or polyether to generate a graft copolymer. Its advantage is high effect to lower the vitrifying temp.

Description

technical field [0001] The invention relates to acrylate rubber emulsion graft polymerization, in particular to a method for reducing the glass transition temperature of acrylate rubber through emulsion graft polymerization. Background technique [0002] Acrylate rubber is an elastomer obtained by copolymerization of acrylate as the main monomer. Its main chain is a saturated carbon chain structure, and its side groups are polar ester groups. Because the primary structure is saturated carbon chain and polar ester group, it endows it with good heat resistance, aging resistance and oil resistance. Compared with other oil-resistant rubbers, acrylic rubbers have excellent cost performance. It is widely used in various high-temperature, oil-resistant environments. However, acrylate rubber also has the disadvantage of poor low temperature resistance. To this end, people use physical methods and chemical methods to improve the low temperature performance of acrylate rubber. Gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00
Inventor 李效玉谢军佟云鹏
Owner BEIJING UNIV OF CHEM TECH
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