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Technique of continuous bulk polymerization for preparing compound body of ABS polymer in high shock resistant

A bulk polymerization and polymer technology, applied in the field of preparation of grafted rubber modified copolymers, can solve the problems of high impact resistance, high impact strength, rubber precipitation, low rubber grafting rate, etc.

Inactive Publication Date: 2006-02-01
SHANGHAI HUAYI POLYMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second and second reactors and subsequent reactors can be various types of reactors commonly used in the bulk polymerization process, but the impact resistance (Izod notched impact strength) of the bulk ABS finally obtained in this patent is still not higher than that of general-purpose HIPS
The disadvantage of producing rubber particles in the first CSTR is that the rubber grafting rate is low, and under the action of back-mixing agitation, rubber precipitation may occur when the feed rubber solution enters the reaction mixture

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] In Example 1, the first reactor uses the CSTR format as the grafting reactor, and the second reactor uses the CSTR format as the phase transition reactor. The advantages of the above process are that the rubber particles contain abundant SAN and the ideal rubber particle size distribution so that the product ABS resin has high impact resistance.

[0076] The weight percentage composition in the rubber solution is 9% for butadiene rubber, 54% for styrene, 18% for acrylonitrile, 19% for ethylbenzene, and organic peroxide (Luperox 11M75, product of ATOFINA) for all rubber The weight percentage of the chain transfer agent (α-methylstyrene dimer mixture) and the organic peroxide is the same as 0.016% of the monomer weight.

[0077] The reaction temperature of the first reactor of the CSTR format is 82°C, the reaction temperature of the second reactor of the CSTR format is 120°C, the reaction temperature of the third reactor of the CSTR format is 140°C, and the reaction temperatu...

Embodiment 2

[0085] Example 2 The 2# reactor in the form of CSTR is used for rubber phase transformation, and the rubber particle size is controlled by controlling the dry matter content of the reaction mixture in the reactor, so that the product body ABS resin has extremely high impact strength and relatively high impact strength. High tensile elongation and better melt fluidity. This example shows that the bulk ABS process of CSTR grafting and CSTR particle size adjustment has flexibility.

[0086] In Example 2, by controlling the dry matter content of the reaction mixture in the 2# reactor, the rubber phase has different rubber particle sizes and different rubber particle size distributions. Other uses the same rubber solution components and process conditions as in Example 1. Test results The product body ABS resin has excellent impact resistance and high tensile elongation, and at the same time has good melt fluidity. The results of the reaction are shown in Table 2.

[0087]

P...

Embodiment 3

[0094] Example 3 In the 1# reactor of the CSTR form, the grafting reaction of rubber is carried out through the low-temperature initiation of organic peroxide and the action of the chain transfer agent with low chain transfer coefficient, which can improve the grafting reaction of rubber in the product ABS resin Utilization rate (hereinafter referred to as rubber utilization rate). The rubber utilization rate can be compared by measuring the gel ratio of the product body ABS resin. Generally speaking, the higher the gel ratio of the bulk ABS resin, the higher its impact resistance.

[0095] In Example 3 and Example 4, only the reaction temperature of the #1 reactor in Example 1 was changed, and other process conditions and rubber solution composition were the same as in Example 1. The reaction temperature of the 1# reactor in Example 3 is relatively low, and the reaction temperature of the 1# reactor in Example 4 is relatively high. Table 3 shows that the gel ratio of the bulk ABS...

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Abstract

A continuous bulk polymerizing process for preparing ABS polymer mixture with high impact resistance includes such steps as adding the solution of polybutadiene rubber in the mixture of alkylvinyl arylhydrocarbon and unsaturated vinylnitrile to the first continuously stirring reactor, graft reaction phase changing in the second reactor, converting more monomers and regulating final molecular weight in the third and fourth reactors, removing volatile components, and cross-linking with rubber.

Description

Technical field [0001] The invention relates to a preparation method of grafted rubber modified copolymer. In particular, it relates to a continuous bulk polymerization method for preparing grafted rubber modified with a monovinyl aromatic monomer and a vinyl unsaturated nitrile copolymer, that is, bulk ABS resin. In addition, the present invention also relates to a bulk ABS resin with extremely high impact resistance obtained by the present invention. Background technique [0002] People have been familiar with the bulk (or block) polymerization process in the styrene polymer industry for almost half a century. In the bulk polymerization process, the monomer not only acts as a polymerization reactant, but also acts as a solvent for the produced polymer. Most bulk polymerization processes actually use an inert solvent as a diluent. In the present invention, the terms "solvent" and "diluent" are interchangeable. Most high-impact polystyrene (ie HIPS in the reference) is obtained t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/04
Inventor 包季欣伍登熙须乾元许长军李光华肖稚聪
Owner SHANGHAI HUAYI POLYMER
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