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Preparation method of styrene-maleic anhydride random copolymer

A technology of random copolymer and maleic anhydride, which is applied in the field of preparing styrene-maleic anhydride random copolymer by precipitation polymerization, can solve the problems of high toxicity of toluene, pollute the environment and the like, and achieves simple processing, simple reaction system, The effect of reducing environmental pollution

Inactive Publication Date: 2011-11-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, toluene is highly toxic, and toluene is used as a reaction medium, which pollutes the environment

Method used

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  • Preparation method of styrene-maleic anhydride random copolymer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] St and MAn molar ratio 8: 2, wherein MAn 0.23g, St 1.0g; Initiator is dicumyl peroxide (DCP) 0.006g; Medium is ethyl butyrate, 7.5mL (monomer mass concentration 15% ). Heat in an oil bath, react at a temperature of 130°C under the protection of nitrogen, and take samples after the reaction for 10min, 20min, 30min, 60min, 120min, and 150min respectively to obtain the dispersion system of random copolymer of styrene and maleic anhydride , the dispersion system was centrifuged and dried to obtain a white powder of styrene-maleic acid drunk random copolymer. The polymerization yields under different reaction times were 14%, 31%, 38%, 50%, 56%, and 62%, respectively, and the MAn content in the copolymer was measured to be 35%, 32%, and 30% by acid-base titration. , 27%, 25%, 24%. The prepared copolymer of styrene and maleic anhydride is a random copolymer.

Embodiment 2

[0032] St and MAn molar ratio 8: 2, wherein MAn 1.37g, St 5.80g; initiator is dicumyl peroxide (DCP) 0.357g; medium is ethyl butyrate, 30mL (monomer mass concentration 20%) . Heated in an oil bath and reacted at 120°C for 24 hours under the protection of nitrogen to obtain a dispersion system of random copolymer of styrene and maleic anhydride. The dispersion system was centrifuged and dried to obtain styrene-maleic anhydride White powder of random copolymer. The polymerization yield was 82%, and the content of MAn in the copolymer measured by acid-base titration was 21%. The number average molecular weight of the copolymer was 14000 g / mol, and the molecular weight distribution coefficient was 1.7. The carbon NMR spectrum of the prepared copolymer ( 13 C-NMR) spectrum see figure 1 , illustrating that the copolymer of styrene and maleic anhydride prepared using the present invention is a random copolymer.

Embodiment 3

[0034] St and MAn molar ratio 9.7: 0.3, wherein MAn 0.21g, St 7.03g; Initiator is dicumyl peroxide (DCP) 0.179g; Medium is ethyl butyrate, 30mL (monomer mass concentration 20% ). Heated in an oil bath and reacted at 110°C for 24 hours under the protection of nitrogen to obtain a dispersion system of random copolymer of styrene and maleic anhydride. The dispersion system was separated by filtration and dried to obtain styrene-maleic anhydride White powder of random copolymer. The polymerization yield was 50%, and the content of MAn in the copolymer measured by acid-base titration was 5%. The prepared copolymer of styrene and maleic anhydride is a random copolymer.

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Abstract

The invention discloses a preparation method of a styrene-maleic anhydride random copolymer, belonging to the field of macromolecule polymerization. The method comprises the following steps: adding a monomer maleic anhydride and an initiator into a solvent for dissolution under the protection of nitrogen protection, and then adding a monomer styrene in a system for dissolution; then heating the reaction system with an oil bath so that the reaction is carried out for 1.5-24 hours at the temperature of 90-130 DEG C so as to obtain a metastable state dispersion system of a copolymer; and after the reaction is finished, centrifuging and filtering, and finally drying so as to obtain the styrene-maleic anhydride random copolymer. In the preparation method, the solvent is organic acid alkyl ester, the molar ratio of styrene to maleic anhydride is (9.7:0.3)-(5:5), the mass concentration sum of the monomers namely styrene and maleic anhydride is 15%-55%, and the mass of the initiator is 0.5-5% of total monomer mass; and stirring and a dispersing agent are not needed, the reaction system is extremely simple, and the process is simple and is easy to control.

Description

technical field [0001] The invention belongs to the field of macromolecular polymerization, and in particular relates to a method for preparing styrene-maleic anhydride random copolymers by precipitation polymerization. Background technique [0002] Styrene-maleic anhydride copolymer (SMA) is a polymer with excellent heat resistance, rigidity and dimensional stability, widely used in latex coatings, water treatment agents, modifiers for adhesives, pesticides Emulsifiers, textile auxiliaries, printing inks, composite materials and curing agents for epoxy resins, etc. [0003] Styrene-maleic anhydride copolymers can be divided into two types according to the composition and sequence structure of the copolymers: one is an alternating copolymer (A-SMA) with a molar ratio of styrene and maleic anhydride close to 1:1, The other is a random copolymer (R-SMA) with low maleic anhydride content. Alternating copolymer (A-SMA) was first produced by Sinclair Petrochemicals and named it...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F222/08C08F2/06C08F4/32
Inventor 马育红郭晓月杨万泰
Owner BEIJING UNIV OF CHEM TECH
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