Method for preparing PBT (polybutylene terephthalate) resin with anti-bacterial function

Abstract

The invention provides a method for preparing PBT (polybutylene terephthalate) resin with an anti-bacterial function. The method comprises steps as follows: 100 parts of PTA pure terephthalic acid, 50-100 parts of 1,4-BDO (butanediol) and 0.2-2 parts of a composite titanium catalyst are added to an esterification reaction kettle, are stirred uniformly and react for 60-270 min at the esterification temperature of 205-225 DEG C under the normal pressure to obtain an esterification reaction product (BHBT); the esterification reaction product (BHBT) is introduced into a polycondensation reaction tank, the reaction temperature is controlled in a range from 250 DEG C to 260 DEG C, a reaction is performed for 1 h under the normal pressure, 1-5 parts of a TTI (triphenylmethane triisocyanate) modified negative ion powder chain extender are added, and the mixture reacts for 1 h under the condition of low vacuum (under the pressure reduced from 50 kPa to 2.5 kPa) and then reacts for 4-7 h under the condition of high vacuum (under the pressure reduced from 133 Pa to 33 Pa) until the power of a stirring paddle shaft is not increased. According to the method, negative ion mineral powder is organically combined in the PBT molecular chain, so that the product has the permanent anti-bacterial function.

Description

technical field [0001] The invention belongs to the field of functional modification of polymer materials, and in particular relates to a preparation method of polybutylene terephthalate resin with antibacterial function. Background technique [0002] Polybutylene terephthalate (PBT) is based on dimethyl terephthalate (DMT) and 1,4-butanediol (1,4-BDO) or terephthalic acid (PTA) and BG High polymer made of raw materials, polybutylene terephthalate (PBT) is a thermoplastic polyester resin, odorless, non-toxic, tasteless, the product originated in the 1960s Celanese Corporation of the United States , although the development and application are late, but due to its excellent performance, low production energy consumption, and low pollution, it can be produced by either transesterification or direct esterification, and can directly use PET synthesis technology and production equipment. The cost is low and the technology is mature, so it has developed rapidly in the past 30 yea...

AI Technical Summary

Problems solved by technology

But this kind of added antibacterial resin, antibacterial agent and polybutylene terephthalate (PBT) resin are only combined through intermolecular force, and as time goes by, it is easy to cause the loss of antibacterial agent