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A kind of small molecular weight ps product and preparation method thereof
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A low-molecular-weight, high-product technology, applied in the field of low-molecular-weight PS products and their preparation, can solve the problems of cumbersome impurity removal process, unstable polymerization system, and high molecular weight of the product in the later stage, and achieve little impact on mechanical properties, easy to master, and simple operation Effect
Active Publication Date: 2021-07-30
山东旭锐新材股份有限公司
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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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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 product, comprising the following steps: batching, reaction, curing, washing and drying; in the reaction, styrene / BPO is mixed dropwise into a flask within 1-1.5 hours, During the dropwise addition, the reaction temperature was controlled at 80-84°C; after the dropwise addition was completed, the temperature was raised to 88°C, the reaction was incubated for 4 hours, and the temperature was controlled at 87-90°C; the ripening was heated to 95°C within 0.5 hours after the reaction was completed, and the temperature was maintained at 87-90°C. 1 hour, the temperature is controlled at 95-100 ℃; after the curing is completed, the temperature is lowered to 60-70 ℃, and the small molecular weight PS obtained by the method of the present invention is filtered, the polymerization system is stable, the yield is ≥ 93.0%, and the molecular weight Mw is 3-50,000, The molecular weight distribution Mw / Mn=1.8 can effectively reduce or eliminate the content of macromolecules and ultra-high macromolecular polymers in the copolymer, greatly improve the purity of PS products, improve the comprehensive performance of PS products, and expand the application field.
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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