Method for preparing phosphor system halogen-free flame-proof copolymerization polyester

Abstract

The invention relates to a method for preparing phosphorus halogen-free flame retardant copolyester. The method is characterized in that halogen-free phosphoric copolymerized flame retardant and glycol are mixed to carry out esterification reaction for 4 to 6 hours under the temperature of 140-210 DEG C and the pressure of 40-70Kpa and then are filtered; flame-retardant esterified product solution is prepared from the filtrate; dimethyl terephthalate, the glycol and promoter are mixed to carry out ester exchange reaction for 2 to 4 hours under the temperature of 160-240 DEG C; after the reaction, the flame-retardant esterified product solution is added, and catalyst and stabilizing agent are added to carry out polyreaction for 2.5 to 4 hours under the temperature of 240-290 DEG C and the pressure of 100Pa; and the phosphorus halogen-free flame retardant copolyester is prepared after discharging the material. Polyester slice can be used as raw material for producing film with flame retardance of grade 94UL V-O or grade VTM-O (collectively called grade VO), flame retardant fibre with flame retardance of grade I or above and grade VO flame retardant plastic product, and the polyester slice has excellent flame retardance.

Description

technical field [0001] The invention belongs to a preparation method of a polymer compound obtained by forming a carboxylate bond on a polymer main chain, and relates to a preparation method of a phosphorus-based halogen-free flame-retardant copolyester. The polyester chips prepared by this method can be used as raw materials for the production of films with a flame-retardant performance of 94UL V-0 level or VTM-O level (collectively referred to as V0 level), flame-retardant fibers of level I and above, and V0-level flame-retardant plastic products. . Background technique [0002] Since the 1970s, the research and application development of flame-retardant polyester has become increasingly active all over the world, and various flame-retardant polyester technologies have come out continuously. After decades of development, flame retardant technology is mainly divided into blending, copolymerization, and post-treatment technology on the one hand, and can be divided into halo...

AI Technical Summary

Problems solved by technology

The above methods all use organophosphorus flame retardants for pretreatment in different ways and then add the polyester reaction system in the esterification or polycondensation stage to obtain a copolymerized flame retardant polyester; although the above methods better improve the flame retardant chip However, due to the influence of polymerization conditions and the activity of various reactants, this type of polyester limits the increase of the real content of flame retardants, and it is difficult to obtain high flame-retardant grade copolymerized flame-retardant polymers. Ester, can not meet the requirement of 94UL V-0 level (referred to as V0 level; UL94 standard is the most common standard for expressing the flame retardant performance of materials at home and abroad) or VTM-0 level film and military flame retardant fiber and other high flame retardant materials. Requirements, the limiting oxygen index (LOI) is not high, the highest is only 36%, there is no halogen-free flame retardant product that can reach the V0 level; its application in high-end products is limited

Images