Safe and easily-controlled high-transparency and low-haze sulfone polymer and preparation method thereof

Abstract

The invention discloses a safe and easily-controlled high-transparency and low-haze sulfone polymer and a preparation method thereof. A synthetic monomeric dihydroxy aromatic compound and / or a synthetic monomeric dichloroaromatic compound which are / is used as a raw material undergo / undergoes a polymerization reaction in an organic solvent in a controlled homogeneous system at a polymerization temperature in the presence of an organic base used as a catalyst to obtain a reaction polymer material; and the organic base used as the catalyst makes no water generated in the reaction, the polymerization system does not need water removal, the catalyst is completely dissolved in the polymerization system, an alkaline aqueous solution is added to the reaction polymer material to carry out a reaction, the obtained system is cooled after the reaction is finished in order to obtain a white strip solid, and the solid is dried to obtain the sulfone polymer product. The reaction is carried out in thehomogeneous system, so the polymerization stability is easily controlled, and the transparency, the heat resistance and the color of the product are good.

Description

Technical field: [0001] The present invention relates to the technical field of special engineering plastics, in particular to the field of safe production of high-temperature-resistant transparent thermoplastic engineering plastic sulfone polymers and their compositions or composite materials; it meets the applications of food contact, electronic appliances, aerospace, medical and health care, etc.; In particular, a safe and easy-to-control high-transparency and low-haze sulfone polymer and a preparation method thereof. Background technique: [0002] Sulfone polymer is a special high-temperature-resistant transparent thermoplastic engineering plastic with outstanding thermal properties, excellent chemical resistance, excellent high-temperature creep resistance, excellent dimensional stability, extremely low smoke and toxic gas emissions, and superior durability Hot water and superheated steam, good electrical performance, mainly including three types of polysulfone PSU, pol...

AI Technical Summary

Problems solved by technology

The existing alkali metal salt-forming agent system technology has the following disadvantages: (1) Water and carbon dioxide are generated simultaneously during the salt-forming process, and the water must be carried out of the polymerization system by evaporation of the water-carrying agent toluene or xylene to continue the reaction, and the xylene condenses After reflux, continue to evaporate and carry, so repeated for several hours, this process is complicated and cumbersome; (2) The produced water stays in the polymerization system for a long time and will undergo hydrolysis reaction with the monomer 4,4'-dichlorodiphenyl sulfone, resulting in a small amount of The failure of the monomer to polymerize eventually makes it difficult to stabilize the molecular weight of the polymer; (3) Generally, the process of using alkali metal hydroxide (KOH or NaOH) as the salt-forming agent is too alkaline. KOH or NaOH exists completely in the form of metal ions and -OH, and sulfolane is easy to decompose, which affects the quality of the final product; (4) using KOH or K2CO3 as a salt-forming agent will cause the resin to contain potassium end groups, making the resin processed at high temperature. (5) Use xylene as a salt-carrying agent. Since xylene is a flammable and explosive substance, the production workshop is more dangerous. It is necessary to build a Class A explosion-proof workshop, and the construction investment is greatly increased, and its boiling point is relatively high. Low, the temperature in the salt-forming stage is high, which will lead to violent cooling and reflux, which will take away a lot of heat and cause high energy consumption; (5) The reaction in the salt-forming stage will take a long time, increasing energy consumption and low production efficiency

The technology of adding haloalkane in the synthetic method of preparing polyether, meanwhile, its preparation process is complicated and the production cost is high

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