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Preparation method of flame-retardant modified polyvinyl acetate used for expanded polystyrene beads

A technology of polyvinyl acetate and expanded polystyrene, which is applied in chemical instruments and methods, compounds of group 5/15 elements of the periodic table, organic chemistry, etc., can solve the problem of low flame retardant efficiency and achieve flame retardant High efficiency, mild reaction conditions and simple operation

Active Publication Date: 2015-12-16
HANGZHOU FANGYUAN PLASTICS MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Professor Qian Lijun of Beijing Technology and Business University proposed in Chinese patent CN10199345A that hexa-(4-formylphenoxy)cyclotriphosphazene and DOPO were prepared by solution and melting methods to prepare compounds with dual-effect functional groups of phosphazene and phosphaphenanthrene , its nitrogen content is only 1.9%, and its flame retardant efficiency is not high, which limits its application to a certain extent

Method used

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  • Preparation method of flame-retardant modified polyvinyl acetate used for expanded polystyrene beads
  • Preparation method of flame-retardant modified polyvinyl acetate used for expanded polystyrene beads
  • Preparation method of flame-retardant modified polyvinyl acetate used for expanded polystyrene beads

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Experimental program
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Effect test

Embodiment 1

[0025] Add 7.6g of thiourea into the reaction flask, then add 20g of ethyl acrylate, then add 2g of anhydrous formic acid while raising the temperature to 50°C, and react for 4.5h; add 60g of hexaaminophenoxycyclotriphosphazene, in a Keep the reaction at 45°C for 1h in the methyl chloride environment; finally add 14g of vinyl acetate and 70g of chloroform, add the catalyst thionyl chloride, and react in the polar solvent toluene at 80°C for 10h, after the reaction is completed, cool to room temperature and discharge to obtain 1 - Thiourea Ethyl Acrylate - Hexaaminophenoxycyclotriphosphazene Polyvinyl Acetate.

Embodiment 2

[0027] Add 7.6g of thiourea into the reaction flask, then add 20g of ethyl acrylate, then add 1.5g of concentrated hydrochloric acid while raising the temperature to 40°C, and react for 5.5h; add 80g of hexaaminophenoxycyclotriphosphazene, Keep the reaction at 50°C in the environment for 0.5h; finally add 10g of vinyl acetate, 70g of chloroform, add the catalyst carbon tetrachloride, react in the polar solvent xylene at 60°C for 20h, cool to room temperature after the reaction, and discharge to obtain 1 - Thiourea Ethyl Acrylate - Hexaaminophenoxycyclotriphosphazene Polyvinyl Acetate.

Embodiment 3

[0029] Add 7.6g of thiourea into the reaction flask, then add 20g of ethyl acrylate, then add 1g of concentrated sulfuric acid while raising the temperature to 45°C, and react for 5h; add 80g of hexaaminophenoxycyclotriphosphazene, Keep the reaction at 40°C for 1.5h in the environment; finally add 18g of vinyl acetate, 70g of chloroform, add the catalyst triphenylphosphine, react in the polar solvent tetrahydrofuran at 70°C for 15h, cool to room temperature and discharge after the reaction, and obtain 1- Thiourea ethyl acrylate-hexaaminophenoxycyclotriphosphazene polyvinyl acetate.

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Abstract

The invention discloses a preparation method of flame-retardant modified polyvinyl acetate used for expanded polystyrene beads. In an existing method, 6-(4-formylphenoxy) cyclotriphosphazene and DOPO are prepared into a compound comprising phosphazene and DOPO double-effect functional groups through a solution and a fusion method, wherein the nitrogen content of the compound is 1.9%, the nitrogen content is small, and flame retardance is low. According to the preparation method, 1-thiourea ethyl acrylate-6-aminophenoxy cyclotriphosphazene reacts with vinyl acetate and chloroform under the action of a catalyst and polar solvent to prepare 1-thiourea ethyl acrylate-6-aminophenoxy cyclotriphosphazene vinyl acetate comprising phosphazene and DOPO double-effect functional groups. The features that the product contains phosphate and nitrogen and is free of halogens, and compared with an existing double-effect functional group compound of the type, the nitrogen content is greatly increased and are utilized for sufficiently exerting the synergistic action of phosphate and nitrogen; the flame-retardant modified polyvinyl acetate is applied to preparing emulsion wrapping the polystyrene beads, and achieves the expected effects of higher flame-retardant efficiency and smaller toxin.

Description

technical field [0001] The invention belongs to the field of organic chemical synthesis, in particular to a method for preparing flame-retardant modified polyvinyl acetate used for expanded polystyrene beads. Background technique [0002] Vinyl acetate (VAc) is a common free radical polymerization monomer, which can be self-polymerized or copolymerized with other monomers to prepare many polymer materials with special properties. Polyvinyl acetate (PVAc) has good elasticity and strong adhesion, and is widely used in coatings, adhesives, paper and other industries. In addition, its hydrolyzate - polyvinyl alcohol (PVA) is a biocompatible, non-toxic, environmentally friendly water-soluble polymer material. PVAc as a coating emulsion has been widely used in the coating of polystyrene beads, but in the current application, its flammability greatly limits its use, and the preparation of a PVAc emulsion with bulk flame retardant properties Into polystyrene beads has become a res...

Claims

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Application Information

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IPC IPC(8): C08F230/02C08F218/08C08L25/06C08L43/02C07F9/6593
Inventor 袁国清张胜曹博赵祖兵袁健华姜鹏章杰王庭芳
Owner HANGZHOU FANGYUAN PLASTICS MASCH CO LTD
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