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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 reduce processing burden Effect

Inactive Publication Date: 2005-12-28
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

[0025] Example 1: 207.5 g of butyl acrylate, 37.5 g of ethyl acrylate, 5 g of glycidyl methacrylate, 0.025 g of tertiary dodecyl mercaptan, and 6.25 g of polybutylene adipate were mixed to obtain a monomer mixed solution Add 400ml deionized water into the reactor, dissolve sodium lauryl sulfate 2.5g, OP-10 2.5g, sodium dihydrogen phosphate 0.5g, disodium edetate 0.25g in deionized water, and then 25% monomer mixed solution was added dropwise to the reactor under stirring, 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 grafti...

Embodiment 5

[0029]Embodiment 5: 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 tetrahydrofuran homopolyether (PTMEG1000) to be miscible to obtain a monomer mixed solution; Add 400ml of deionized water into the container, 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 dissolve 25% The monomer mixed solution was added dropwise to the reactor, and N 2 , continue to emulsify under stirring for 30 minutes. Raise the temperature to 60°C, add the initiator dropwise, add the remaining monomer mixed solution dropwise after initiating polymerization, and control the remaining initiator and remaining monomer to be added dropwise within 1 hour; keep warm at 60°C and continue the reaction for 2 hours; use 2 % CaCl 2 Aqueous solution 60 ℃ demulsification, washing, drying to obtain acrylate copolymer elastomer (raw rub...

Embodiment 6-11

[0033] Listed in Table 4, the tetrahydrofuran homopolyether (PTMEG1000) in the polymerization system of Example 5 is replaced with the polyether listed in Table 4, and other components and processes are unchanged:

[0034] Example 6

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PUM

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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 Patents(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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