Preparation method of molecular chain regulator capable of improving mechanical property of polystyrene waste plastics

A technology of chain regulator and polystyrene, which is applied in the field of preparation of molecular chain regulator, can solve the problems of high price of modifier, lower stiffness, tensile strength and processing performance, etc. time, the effect of increasing molecular chain length

Active Publication Date: 2013-10-23
SHANGHAI INTCO INDUSTRIES CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method to improve the mechanical properties of polystyrene waste plastics is mainly to add one or several modification additives. The added modification additives mainly include: 1. Rubber, this type of elastomer can significantly improve the toughness of waste plastics, However, the stiffness, tensile strength and processing performance are reduced to varying degrees, and the price of such modifiers is relatively high

Method used

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  • Preparation method of molecular chain regulator capable of improving mechanical property of polystyrene waste plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] 1) Add 30g of α-cyclodextrin to 1000g of absolute ethanol solvent, then put it into an ultrasonic environment (500W power, 20KHz frequency) to dissolve for 30min, then gradually add 10g dibenzoyl peroxide, 20g dibenzoyl peroxide Dicumylbenzene, 10g of azobisisobutyronitrile, 10g of 2,3 dicyano-2,3 diethyl diphenylsuccinate, and continue ultrasonication for 30 minutes;

[0009] 2) The solution prepared above was distilled under reduced pressure, dried under vacuum at 8°C after distillation, and then ground by a ball mill for 40 minutes at 8°C to obtain a cyclodextrin-coated initiator powder;

[0010] 3) Dissolve 50 g of the powder obtained by the above distillation, 1 g of 2,5-di-tert-butylhydroquinone and 50 g of dispersant in 1 kg of styrene monomer, stir and dissolve fully to obtain a molecular chain regulator . Add 3% of the molecular chain regulator in the granulation process of polystyrene waste plastics, and the described dispersant is a compound of 1:1 (weight r...

Embodiment 2

[0012] 1) Add 80g of β-cyclodextrin to 1000g of absolute ethanol solvent, then put it into an ultrasonic environment (power 800W, frequency 40KHz) to dissolve for 50min, then gradually add 20g of dibenzoyl peroxide, 20g of azo Diisobutyronitrile, 10g azobisisobutyronitrile, 5g 2,3-dicyano-2,3-diphenylsuccinate diethyl, continue ultrasonication for 50min;

[0013] 2) The solution prepared above was distilled under reduced pressure, dried in vacuum at 8°C after distillation, and then ground by a ball mill for 50 minutes at 8°C to obtain a cyclodextrin-coated initiator powder;

[0014] 3) Dissolve 60 g of the powder obtained by the above distillation, 2 g of 2,5-di-tert-butylhydroquinone and 60 g of dispersant in 1 kg of styrene monomer, stir and dissolve to obtain a molecular chain regulator , The dispersant is a 1:1 (weight ratio) compound of sodium dodecylbenzenesulfonate and alkylphenol polyoxyethylene ether. The mechanical properties of the 3% molecular chain regulator adde...

Embodiment 3

[0017] 1) Add 110g of γ-cyclodextrin to 1000g of absolute ethanol solvent, then put it into an ultrasonic environment (power 1100W, frequency 60KHz) to dissolve for 60min, then gradually add 20g of dibenzoyl peroxide, 20g of peroxide Dicumyl, 20g azobisisobutyronitrile, continue ultrasonication for 50min;

[0018] 2) The solution prepared above was distilled under reduced pressure, dried in vacuum at 8°C after distillation, and then ground by a ball mill for 60 minutes at 8°C to obtain a cyclodextrin-coated initiator powder;

[0019] 3) 80 g of the powder obtained by the above distillation, 3 g of 2,5-di-tert-butyl hydroquinone and 80 g of dispersant are dissolved in 1 kg of styrene monomer, fully stirred and dissolved to obtain a molecular chain regulator, The dispersant is a 1:1 (weight ratio) compound of sodium dodecylbenzenesulfonate and alkylphenol polyoxyethylene ether. . Add 3% of the molecular chain regulator in the granulation process of polystyrene waste plastics, ...

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Abstract

The invention relates to a preparation method of a molecular chain regulator capable of improving the mechanical property of polystyrene waste plastics. The preparation method comprises the following steps of: adding 3-20 parts by weight of cyclodextrin into 100 parts by weight of an absolute ethyl alcohol solvent, then putting the mixture in an ultrasonic environment, dissolving for 30-90 minutes, gradually adding 1-10 parts by weight of dibenzoyl peroxide, 1-10 parts by weight of dicumyl peroxide, 1-10 parts by weight of azodiisobutyronitrile and 1-10 parts by weight of 2, 3-dicyan-2,3-diphenyl diethyl succinate, and carrying out continuous ultrasonication for 20-60 minutes; carrying out reduced-pressure distillation on the prepared solution, carrying out vacuum drying at 5-10 DEG C after distillation, and grinding the dried product at 5-10 DEG C for 20-90 minutes by a ball mill to obtain cyclodextrin-coated initiator powder; and dissolving 1-10 parts by weight of powder obtained by distillation, 0.1-0.6 part of 2, 5-di-tert-Butylhydroquinone and 5-20 parts by weight of dispersing agent into 100 parts by weight of styrene monomer and sufficiently stirring to dissolve to obtain the molecular chain regulator. The preparation method disclosed by the invention is economic, convenient, rapid and capable of realizing continuous large-scale production and remarkably improving the physicochemical property of materials.

Description

technical field [0001] The invention relates to a preparation method of a molecular chain regulator capable of improving the mechanical properties of polystyrene waste plastics. technical background [0002] In 2011, my country's polystyrene waste plastics reached 1 million tons, an increase of 21.4% compared with 2010. It is estimated that polystyrene waste plastics will reach 1.5 million tons in 2012, so the recycling, regeneration and application of polystyrene waste plastics will have a significant impact. Social benefits, environmental benefits and economic benefits. However, due to natural aging and multiple thermal processing processes, polystyrene waste plastics will undergo thermal degradation to varying degrees, and local molecular chains will be broken, and its performance will be reduced by at least 30% compared with new materials. %, so it is of great significance to improve the mechanical properties of polystyrene waste plastics. [0003] At present, the method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F257/02C08F4/04C08F4/38C08F4/00
Inventor 李志杰丁友江罗京科刘方毅
Owner SHANGHAI INTCO INDUSTRIES CO LTD
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