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Small molecular weight PS (polystyrene) product and preparation method thereof

A low-molecular-weight, low-molecular-weight technology, which is applied in the field of low-molecular-weight PS products and their preparation, can solve problems such as cumbersome impurity removal procedures, unstable polymerization systems, and complex preparation processes in the later stage, and achieve small impact on mechanical properties, easy mastery, and expanded application field effect

Active Publication Date: 2019-05-17
山东旭锐新材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above patents solves the problems of complex preparation process, cumbersome impurity removal process in the later stage, large molecular weight of the product, and unstable polymerization system, which cannot meet the applications in certain fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: A kind of low molecular weight PS product and preparation method thereof

[0036] A kind of preparation method of low molecular weight PS product of the present embodiment, comprises the following steps:

[0037] (1) Ingredients

[0038] ① Add 50g of styrene to the beaker, add 1.75g ​​of initiator BPO, stir at room temperature until completely dissolved, transfer to a constant pressure dropping funnel to obtain a styrene / BPO mixture, and set aside.

[0039] ②Add 150g of deionized water to the four-necked flask, start stirring, add 0.08g of dispersant PVA, heat up to 85°C, stir until completely dissolved, cool down to 82°C, and start adding the prepared styrene / BPO mixture dropwise.

[0040] (2) Reaction:

[0041] Add the styrene / BPO mixture dropwise to the flask within 1-1.5 hours. During the dropwise addition, the reaction temperature is controlled at 80-84°C;

[0042] After the dropwise addition is completed, use a heating mantle (direct heating gear)...

Embodiment 2

[0052] Embodiment 2: A kind of low molecular weight PS product and preparation method thereof

[0053] A kind of preparation method of low molecular weight PS product of the present embodiment, comprises the following steps:

[0054] Step 1. Raw material preparation:

[0055] (1) Preparation of anhydrous dichloromethane: put 360g of dichloromethane in a four-necked flask, add 1.5g of phosphorus pentoxide, stir for 5-6 hours, and check that the water content is less than 0.03%;

[0056] (2) Vaporization of liquid chlorine: After the liquid chlorine in the steel cylinder is vaporized by the vaporization pool, it is stored in the buffer tank for future use.

[0057] Step 2, synthetic bromine chloride:

[0058]Add 75g of dichloromethane and 50g of bromine into the four-necked bottle, lower the temperature to -10--13°C, and then slowly inject 23g of chlorine gas into the four-necked bottle. After the chlorine gas is added, keep the low temperature and keep it warm for 10 minutes,...

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Abstract

The invention provides a preparation method of a small molecular weight PS (polystyrene) product. The method comprises the following steps: batching, reaction, curing, washing and drying, wherein thereaction is conducted as follows: a styrene / BPO mixture is added dropwise to a flask within 1-1.5 hours, the reaction temperature is controlled at 80-84 DEG C during dropwise addition, the temperatureis raised to 88 DEG C after dropwise addition is completed, thermal reaction is performed for 4 hours, and the temperature is controlled at 87-90 DEG C; during curing, the temperature is raised to 95DEG C in 0.5 hours after the reaction is finished, and the temperature is kept for 1 hour at 95-100 DEG C; after curing, the temperature is reduced to 60-70 DEG C, and filtering is performed. The small molecular weight PS obtained with the method has stable polymerization system, has yield being equal to or higher than 93.0%, has molecular weight Mw of 30,000-50,000 and molecular weight distribution Mw / Mn of 1.8, the content of polymers with large molecular weight and super-large molecular weight in the copolymer can be effectively reduced or eliminated, purity of the PS product is greatly improved, comprehensive performance of the PS product is improved, and the application field is expanded.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a low-molecular-weight PS product and a preparation method thereof. Background technique [0002] PS is the abbreviation of Polystyrene, and the Chinese name is polystyrene, which refers to a polymer synthesized by addition polymerization of styrene monomer. It is a colorless and transparent thermoplastic with a glass transition temperature higher than 100°C, so it is often used to make various disposable containers that need to withstand the temperature of boiling water, as well as disposable foam lunch boxes. [0003] The Chinese patent with publication number CN102532734A discloses a method for preparing structural weather-resistant high-impact polystyrene, which is carried out according to the following steps: 1) Preparation of graft masterbatch: adding polystyrene, main chain Saturated rubber elastomer, Lewis acid composite catalyst, and co-catalyst; melt grafting re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F112/08C08F2/48C08F2/52
Inventor 李金忠王强陶书伟杨振振杨清波刘滨王光照
Owner 山东旭锐新材股份有限公司