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SAN (styrene-acrylonitrile copolymer) preparation method

An aromatic compound and drying technology, applied in the field of polymer synthesis, can solve the problems of uncontrollable molecular weight and distribution of polymers, easy coupling and disproportionation of free radicals, etc., and achieve the effect of good molecular weight control ability and narrow molecular weight distribution.

Active Publication Date: 2012-03-21
ZHEJIANG OCEANKING DEVELOPMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the coupling, disproportionation termination and other chain termination reactions between free radicals initiated and decomposed by common free radical polymerization initiators, the molecular weight and distribution of the polymer cannot be controlled at all.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 0.01 mole of titanium tetrachloride, 0.01 mole of 8-hydroxyquinoline and 0.01 mole of 1-bromo-1-phenylethane and dissolve them in 20 ml of cyclohexanone, and put them in a vacuum-pumped and nitrogen-filled oven. In a single-necked glass bottle, seal the bottle mouth with a latex tube, keep the temperature in a water bath at 60°C for 30 minutes, and obtain the titanium complex catalyst after cooling.

[0029] Take 0.1 mole of styrene, 0.03 mole of acrylonitrile, 0.01 mole of cyclohexene, and 20ml of toluene, put them into a single-necked glass bottle, add 2ml of the titanium complex catalyst prepared above, heat to 85°C, react for 2.5 hours, stop heating , after cooling, the product was poured into methanol solution of hydrochloric acid containing 5wt% hydrochloric acid to precipitate the heat-resistant SAN copolymer, and the precipitate obtained by filtering was washed with methanol to neutrality and dried in vacuum to obtain a transparent copolymer.

[0030] The n...

Embodiment 2

[0032] Take 0.01 mole of titanium tetrachloride, 0.03 mole of α, α'-bipyridine and 0.01 mole of 1-bromo-1-phenylethane dissolved in 20 ml of cyclohexanone, and put it into the In a baked single-necked glass bottle, seal the bottle mouth with a latex tube, keep the temperature in a water bath at 70°C for 20 minutes, and obtain the titanium complex catalyst after cooling.

[0033] Take 0.1 mole of styrene, 0.03 mole of acrylonitrile, 0.01 mole of cyclohexene, and 20ml of petroleum ether, put them into a single-mouth glass bottle, add 2ml of the above-mentioned titanium complex catalyst, heat to 100°C, react for 8 hours, stop heating, and cool Finally, the product was poured into a methanolic hydrochloric acid solution containing 2 wt% hydrochloric acid to precipitate the heat-resistant SAN copolymer. The precipitate was washed with methanol until neutral, and dried in vacuum to obtain a transparent copolymer with a yield of 97.2%.

[0034] The number average molecular weight of ...

Embodiment 3

[0036] Take 0.10 mole of titanium tetrachloride, 0.01 mole of α, α'-bipyridine and 0.01 mole of 1-bromo-1-phenylethane dissolved in 20 ml of cyclohexanone, and put it into In a baked single-necked glass bottle, seal the bottle mouth with a latex tube, keep the temperature in a water bath at 80°C for 30 minutes, and obtain the titanium complex catalyst after cooling.

[0037] Take 0.1 mole of styrene, 0.03 mole of acrylonitrile, 0.01 mole of cyclohexene, and 20 ml of anisole, put them into a single-port glass bottle, add 2 ml of the titanium complex catalyst prepared above, heat to 90 ° C, and react for 2 hours. Heating was stopped, and after cooling, the product was poured into methanolic hydrochloric acid solution containing 5 wt% of hydrochloric acid to precipitate the heat-resistant SAN copolymer. The precipitate was washed with methanol until neutral, and dried in vacuum to obtain a transparent copolymer.

[0038] The number average molecular weight of the copolymer measur...

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Abstract

The invention relates to an SAN (styrene-acrylonitrile copolymer) preparation method. The SAN preparation method includes steps of adding polymerized monomers into a closed reactor which is filled with nitrogen and dried to be mixed uniformly, adding uniformly-mixed solvent and catalyst at one step by an injector, controlling the temperature of a reaction system within a range from 60 DEG C to 110 DEG C, and pouring reacted mixture into hydrochloric acid carbinol mixed solution containing 2% to 10% by weight of hydrochloric acid after two to eight hours of reaction so as to stop polymerization. The catalyst is titanium complex, and the preparation method of the titanium complex includes steps of adding titanium tetrachloride, ligand, halohydrocarbon and solvent into a closed vacuum container sequentially so as to react for 15 minutes to 60 minutes at the constant temperature ranging from 40 DEG C to 100 DEG C, and then producing the catalyst of the titanium complex after cooling. Compared with the prior art, the SAN preparation method utilizes the catalyst which is the metal coordination catalyst, has excellent molecular weight control ability, and can well control the molecular weight of copolymers, dispersion of the molecular distribution is narrow, and Mw / Mn=1.3 to 2.0.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a preparation method of SAN. Background technique [0002] SAN is a copolymer prepared by the copolymerization of styrene and acrylonitrile. SAN resin is an amorphous colorless or yellowish thermoplastic with good performance in dimensional stability, weather resistance, heat resistance, oil resistance and chemical stability. SAN resin is resistant to non-polar substances such as gasoline, kerosene, aromatic hydrocarbons, water, acid, alkali, detergent and halogenated hydrocarbon solvents, but is soluble in ketones and can be swelled by organic solvents. At present, most companies in the world focus on the research of special high-performance ABS, and the research and development of special high-performance SAN such as heat-resistant SAN and chemical-resistant SAN is relatively weak. Commodity SANs on the market are mainly general-purpose grades and injection molding grades. Th...

Claims

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Application Information

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IPC IPC(8): C08F212/10C08F220/44C08F232/04C08F222/40C08F4/76
Inventor 傅建永房江华沈曙光周文斌杨建平邱琪浩胡敏杰方义红
Owner ZHEJIANG OCEANKING DEVELOPMENT CO LTD
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