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Preparation method of polybutylene terephthalate polyester resin

A technology of polybutylene terephthalate and polybutylene phthalate, applied in the field of preparation of polybutylene terephthalate polyester resin, can solve the problem of poor quality stability of PBT and high rate of substandard products , poor color and other problems, to achieve the effect of stable product quality, excellent product quality and small quality difference

Inactive Publication Date: 2014-07-16
江苏宝田新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Traditionally, batch production of PBT has disadvantages such as poor quality stability, high energy consumption, high rate of out-of-class products, and poor color.

Method used

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  • Preparation method of polybutylene terephthalate polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Nissan 120KG PBT continuous production method

[0033] Feed the homogeneously mixed PET, 1,4-butanediol and transesterification catalyst into the screw extruder, the mass ratio of PET and 1,4-butanediol is 1:0.01~0.1, the amount of zinc acetate catalyst added is the same as The mass ratio of PET is 0.3:1000; the temperature of the screw reaction zone is 200-300°C, the pressure of the reaction zone is 0.1Mpa-10Mpa, the screw speed is 10-60r / min, and the extrusion is carried out at a constant speed of 5.515Kg / h. After being filtered by a 150-250 mesh melt filter, it is extruded into a 20-liter transesterification reactor, and a tube heat exchanger is installed in the transesterification reactor to ensure the heat exchange effect, and the extruded material is directly sent to the stirring paddle The lower end of the blade, the blade is a push-type 4 pieces twisted at 210 degrees, the wall of the reactor is equipped with a material drainage guide plate, and the material is ...

Embodiment 2

[0038] Production method of 24 tons of PBT continuous method per day

[0039] Feed the homogeneously mixed PET raw materials together with 1,4-butanediol and transesterification catalyst into the screw extruder, the mass ratio of PET and 1,4-butanediol is 1:0.01~0.1, zinc acetate catalyst and The mass ratio of PET is 0.3:1000; the temperature of the screw reaction zone is 200-300°C, the pressure of the reaction zone is 0.1Mpa-10Mpa, the screw speed is 10-60r / min, and the extrusion is carried out at a constant speed of 1103.00Kg / h. After being filtered by a 150-250 mesh melt filter, it is extruded into a 4000 liter transesterification reactor. A tube heat exchanger is installed in the transesterification reactor to ensure the heat exchange effect, and the extruded material is directly sent to the stirring paddle The lower end of the blade, the blade is a push-type 4 pieces twisted at 210 degrees, the wall of the reactor is equipped with a material drainage guide plate, and the ...

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Abstract

The invention discloses a preparation method of polybutylene terephthalate polyester resin. The preparation method comprises the following steps of: (1) mixing PET (Polyethylene Terephthalate) raw materials, 1,4-butanediol and a catalyst to obtain a molten mixture, then continuously adding the molten mixture into an ester exchange reactor, and meanwhile, continuously adding the 1,4-butanediol to carry out ester exchange reaction to obtain a butylene terephthalate ester matter; and (2) simultaneously and continuously adding the butylene terephthalate ester matter and a stabilizer into a reaction kettle to carry out polymerization reaction to obtain the polybutylene terephthalate polyester resin when the viscosity of a product is larger than or equal to 0.50dL / g. According to the technical scheme disclosed by the invention, a great number of PET wastes with various shapes and performances can be used as raw materials for producing, so that the recycling of the waste PET is realized; and compared with a synthesis process in which purified terrephthalic acid is used, the preparation method can be used for greatly reducing the output of esterified wastewater in the synthesis process and is beneficial to the protection of the environment and the reduction of the environment-friendly cost.

Description

technical field [0001] The invention relates to a preparation method of polybutylene terephthalate polyester resin; in particular to a method for preparing polybutylene terephthalate by a continuous method of regenerated polyethylene terephthalate (PET) Ester (PBT) polyester resin method. Background technique [0002] Polyester made of PET is a general-purpose polymer material widely used in many fields, mainly used in textiles and fibers, packaging films and packaging bottles. At present, the annual output of polyester in my country is about 40 million tons, and a large amount of polyester waste is produced every year. [0003] In order to ensure sustainable development and full utilization of materials and reduce environmental pollution, the recycling and reuse of waste PET polyester has attracted increasing attention from all over the world in recent years. [0004] At present, most of the waste PET material polyester (hereinafter referred to as waste PET) methods used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/78
Inventor 蒋云
Owner 江苏宝田新材料股份有限公司
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