Method of preparing ethylene propylene diene monomer graft polymer through solution grafting copolymerization and application thereof

A technology of EPDM rubber and graft copolymer, which is applied in the field of preparation of graft copolymer, can solve the problems such as aging resistance to yellowing that needs improvement, large content of AN monomer unit, yellowing and brown color, etc. The effect of improving monomer conversion rate, easy heat transfer, and stable polymerization process

Active Publication Date: 2010-02-17
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009]However, styrene (St) is a non-polar monomer and acrylonitrile (AN) is a polar monomer, so it is necessary to increase AN in the St-AN comonomer In order to obtain the graft copolymer EPDM-g-SAN with good compatibility with the polar polymer SAN resin, the AN monomer unit content of the EPDM-g-SAN graft chain is large, and it is compatible with the polar polymer SAN resin at high temperature. During the preparation of AES by melt blending of SAN resin and the melt processing of AES, the AN unit will form a highly chromogenic polyimide structure, which will cause the AES product to be yellowish brown and darker in color, and its anti-aging yellowing performance needs to be improved.

Method used

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  • Method of preparing ethylene propylene diene monomer graft polymer through solution grafting copolymerization and application thereof
  • Method of preparing ethylene propylene diene monomer graft polymer through solution grafting copolymerization and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0041] The preparation of embodiment 1 EPDM-g-MAN

[0042] This embodiment adopts the solution graft copolymerization method, uses EPDM as the graft matrix, and MMA and AN as the graft monomers to prepare EPDM graft copolymer-EPDM-g-MAN, and its specific preparation steps are as follows:

[0043] (1) Use a 1000mL four-necked flask as a reactor, equipped with a stirrer, an automatic temperature control oil bath heating device, a return pipe, a nitrogen pipe and a material thermometer; 117.7g of n-heptane is mixed with 254.7g of toluene to become 372.4g of Mix the solvent, add the mixed solvent and 41.60g EPDM into the four-neck flask, stir for 4-6 hours to dissolve it into a uniform EPDM glue;

[0044] (2) Add 37.44g of methyl methacrylate and 4.16g of acrylonitrile mixed monomer into the above EPDM glue, stir for 30 minutes to make the system a uniform solution; dissolve 0.8325g of BPO in 20g of toluene, drop it into EPDM / MMA-AN solution system, stirred for 20 minutes to mak...

Embodiment 2

[0055] The preparation of embodiment 2 EPDM-g-MAS

[0056] The present embodiment adopts the solution graft copolymerization method, with EPDM as the graft base, MMA, AN and St as graft monomers to prepare EPDM graft copolymer-EPDM-g-MAS, in its preparation process, EPDM and monomer ( The mass ratio of MMA, AN and St) is 50:50, and the consumption of BPO is 1.0 mass %, and the mass ratio of n-heptane and toluene in the mixed solvent is 30:70, and the consumption of mixed solvent is 82.5 mass %, and polymerization reaction temperature is 80°C, the polymerization reaction time is 20 hours, the amounts of MMA, AN and St are shown in Table 2, and the rest of the operations are the same as in Example 1.

[0057] Embodiment 2 prepares gained EPDM-g-MAS, the monomer conversion (CR), grafting rate (GR) and grafting efficiency (GE) of its grafting system are as shown in table 2, use this toughening agent EPDM- The AEMS prepared by blending g-MAS and SAN resin, the mass ratio of SAN re...

Embodiment 3

[0062] The different mass ratio of embodiment 3 EPDM and monomer influences on grafting system and AEMS

[0063] The present embodiment adopts the solution graft copolymerization method, with EPDM as the graft base, MMA and AN as graft monomers to prepare EPDM graft copolymer-EPDM-g-MAN, in its preparation process, EPDM and monomer (MMA and The mass ratio of AN) is a series of ratio values ​​shown in table 3, the consumption of BPO is 1.0 quality %, the mass ratio of n-heptane and toluene in the mixed solvent is 30: 70, the consumption of mixed solvent is 82.5 quality %, polymerization reaction temperature 80°C, the polymerization reaction time was 20 hours, the mass ratio of MMA and AN was 90:10, and the rest of the operations were the same as in Example 1.

[0064] Embodiment 3 prepares gained EPDM-g-MAN, the monomer conversion rate (CR), grafting rate (GR) and grafting efficiency (GE) of its grafting system are as shown in table 3, use this toughening agent EPDM-g-MAN The ...

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Abstract

The invention discloses a method of preparing ethylene propylene diene monomer (EPDM) graft polymer through solution grafting copolymerization and an application thereof in the preparation of engineering plastics. The method optimizes and improves the preparation method on the basis of the solution grafting copolymerization preparation of EPDM-g-SAN, introduces polar monomer MMA, synthesizes EPDM-g-MAN or EPDM-g-MAS which has less content of AN unit of the graft chain, on the condition of low AN dosage; in addition, the highest monomer conversion rate of the method can reach 70-95% by adjusting the monomer proportioning so as to increase the grafting rate and grafting efficiency of the grafting copolymerization system and significantly improve the compatibility between EPDM graft polymer and SAN resin and the toughening efficiency of EPDM graft polymer to SAN resin. By mixing the EPDM graft polymer prepared in the invention and SAN resin, impact resistance engineering plastics with excellent weather resistance, aging resistance and yellowing resistance and high glossiness can be prepared.

Description

technical field [0001] The invention relates to a preparation method of a graft copolymer, in particular to a method and application of a solution graft copolymerization to prepare a EPDM graft copolymer. Background technique [0002] AES is a new type of modified engineering plastic that has appeared in recent years. It is a blend of EPDM, styrene and acrylonitrile (St-AN) graft copolymer (EPDM-g-SAN) and SAN resin. , due to the low content of double bonds in the molecular chain of EPDM, AES has excellent ozone aging resistance, weather aging resistance and aging yellowing resistance. bigger. [0003] In Chinese patent 200710028132, Wang Lianshi, Guo Yubo and others prepared EPDM-g-SAN toughening agent by solution graft copolymerization method, and its preparation steps are: [0004] (1) EPDM is added in an organic solvent or a mixed solvent, stirred at 70 to 90° C. until completely dissolved, and made into a glue solution with a solid content of 10 to 30% by weight; the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/06C08F2/04
Inventor 王炼石刘伟涛蔡彤旻张安强曾祥斌
Owner KINGFA SCI & TECH CO LTD
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