Phosphorus-containing flame-retardant engineering plastic PSU (polysulfone) and synthetic method thereof

A technology of engineering plastics and synthesis methods, which is applied in the field of polymer materials, can solve the problems of surface migration of flame retardants and poor mechanical properties of products, and achieve the effects of good flame retardancy, better flame retardancy, and high transparency

Inactive Publication Date: 2018-07-20
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The halogen-free flame-retardant PSUs prepared by the above patents all belong to the flame-retardant method of adding flame retardants, and the mechanical properties of the products are poor, and there are shortcomings such as surface migration of flame retardants.

Method used

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  • Phosphorus-containing flame-retardant engineering plastic PSU (polysulfone) and synthetic method thereof
  • Phosphorus-containing flame-retardant engineering plastic PSU (polysulfone) and synthetic method thereof
  • Phosphorus-containing flame-retardant engineering plastic PSU (polysulfone) and synthetic method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A method for synthesizing phosphorus-containing flame-retardant engineering plastic polysulfone, comprising the following steps:

[0045] (1) drop into 120g bisphenol A, 6.53g diphenyl methylphosphonate (content 95%, 0.025mol) in the 1000mL there-necked flask device that distillation column and mechanical stirrer are housed, 5mg sodium phenoxide (NaOPh) catalyzer, Introduce nitrogen to discharge the air, heat the oil bath, raise the temperature of the reaction mixture to 240°C-250°C, keep it warm for 15 hours, collect about 5.3g of distillate during the reaction, cool to 140°C after the transesterification reaction , to obtain a mixture of reactive phosphorus-containing compounds and bisphenol A;

[0046] (2) In the above reaction product, under the condition of passing through dry nitrogen, add 143.50g 4,4'-dichlorodiphenyl sulfone (0.5mol), 64.00g sodium carbonate, 340.00g N,N'-dimethyl Acetamide, 80.00g xylene, stirred and dissolved, heated to 135-140°C and reacted ...

Embodiment 2

[0051] A method for synthesizing phosphorus-containing flame-retardant engineering plastic polysulfone, comprising the following steps:

[0052] (1) drop into 125.4g bisphenol A, 13.06g diphenyl methylphosphonate (content 95%, 0.05mol) in the 1000mL three-necked flask device that distillation column and mechanical stirrer are housed, 10mg sodium phenoxide (NaOPh) catalyst , feed nitrogen to discharge the air, heat the oil bath, raise the temperature of the reaction mixture to 240°C-250°C, keep the temperature for 15 hours, collect about 10.0g of distillate during the reaction, and cool to 140°C after the transesterification reaction °C, a mixture of reactive phosphorus-containing compounds and bisphenol A is obtained;

[0053] (2) In the above reaction product, under the condition of passing through dry nitrogen, add 143.50g 4,4'-dichlorodiphenyl sulfone (0.5mol), 64.00g sodium carbonate, 340.00g N,N'-dimethyl Acetamide, 80.00g xylene, stirred and dissolved, heated to 135-140...

Embodiment 3

[0058] A method for synthesizing phosphorus-containing flame-retardant engineering plastic polysulfone, comprising the following steps:

[0059] (1) drop into 131.1g bisphenol A, 19.59g diphenyl methylphosphonate (content 95%, 0.075mol) in the 1000mL three-necked flask device that distillation column and mechanical stirrer are housed, 15mg sodium phenoxide (NaOPh) catalyst , pass nitrogen gas to discharge the air, heat the oil bath, raise the temperature of the reaction mixture to 240°C-250°C, keep it warm for 15 hours, collect about 15.0g of distillate during the reaction, cool to 140°C after the transesterification reaction °C, a mixture of reactive phosphorus-containing compounds and bisphenol A is obtained;

[0060] (2) In the above reaction product, 143.50g of 4,4'-dichlorodiphenyl sulfone (0.5mol), 70.00g of sodium carbonate, 340.00g of N,N'-dimethyl Acetamide, 80.00g xylene, stirred and dissolved, heated to 135-140°C and reacted for 3 hours. During the reaction, the wa...

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Abstract

The invention discloses phosphorus-containing flame-retardant engineering plastic PSU (polysulfone) and a synthetic method thereof. The synthetic method comprises the following steps: 1) performing transesterification on excess bisphenol A and diphenyl methylphosphonate under catalysis to generate a reactive phosphorus-containing compound; 2) then adding 4,4'-dichlorodiphenyl sulfone, a salt-forming agent, a polar organic solvent and a dehydrating agent for a salt forming reaction and a polymerization reaction to obtain a polymerized viscous solution; 3) performing water cooling, crushing andfiltering on the polymerized viscous solution, performing washing with deionized water to remove the solvents and byproduct sodium chloride, and performing vacuum drying to obtain phosphorus-containing engineering plastic PSU. By introducing a phosphorus-containing unit into a molecular structure of a polymer, the defect that addition type flame-retardant PSU is non-transparent, easy to migrate, poor in mechanical property and the like is overcome, the synthesized halogen-free flame-retardant PSU is high in transparency, and phosphorus and sulfur in molecules can have synergy, so that the flame retardance is better and can reach UL94 level V-0.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a phosphorus-containing flame-retardant engineering plastic polysulfone (PSU) and a synthesis method thereof. Background technique [0002] Polysulfone (PSU) is a thermoplastic engineering plastic with excellent mechanical properties, high rigidity, wear resistance, radiation resistance, hydrolysis resistance, high strength, high thermal stability and self-extinguishing properties, and the processed products have good dimensional stability. The molding shrinkage rate is small, and it has excellent electrical properties and good chemical stability in a wide temperature range. Therefore, for a long time, polysulfone has been widely used in the fields of electronic appliances, mechanical processing, automobiles, medical appliances, food processing and non-stick coatings. However, compared with other polysulfone resins, the flame retardancy of PSU is not ideal....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/23
CPCC08G75/23
Inventor 罗儒显张文华朱杰辉
Owner WUYI UNIV
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