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Preparation method of polybutylene terephthalate polyester resin

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

Inactive Publication Date: 2013-09-18
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 evenly mixed PET together with 1,4-butanediol and transesterification catalyst into a screw extruder. The mass ratio of PET is 0.3:1000; the temperature of the screw reaction zone is 200-300℃, the pressure of the reaction zone is 0.1Mpa-10Mpa, the screw speed is 10-60r / min, and the extruder is extruded 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. The transesterification reactor is equipped with a tube heat exchanger to ensure the heat exchange effect, and the extruded material is directly sent to the stirring paddle. At the lower end of the blade, the blades are propelled with 4 pieces of 210-degree twist. The wall of the reactor is equipped with a material drainage guide plate. After the material is directly sent to the lower end of the stirring blade, the blade stirs and presses the material downward, so t...

Embodiment 2

[0038] Continuous production method of 24 tons of PBT per day

[0039] The homogeneously mixed PET material raw material is fed into the screw extruder together with 1,4-butanediol and transesterification catalyst. The mass ratio of PET and 1,4-butanediol is 1:0.01-0.1. The zinc acetate catalyst and the The mass ratio of PET is 0.3:1000; the temperature of the screw reaction zone is 200~300℃, the pressure of the reaction zone is 0.1Mpa~10Mpa, the screw speed is 10~60r / min, and the extruded at a constant speed of 1103.00Kg / h, After being filtered by a 150-250 mesh melt filter, it is extruded into a 4,000-liter transesterification reactor. The transesterification reactor is equipped with a tube heat exchanger to ensure the heat exchange effect, and the extruded material is directly sent to the stirring paddle. At the lower end of the blade, the blades are propelled with 4 pieces of 210-degree twist. The wall of the reactor is equipped with a material drainage guide plate. After ...

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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, it relates to a continuous method for preparing polybutylene terephthalate by regenerated polyethylene terephthalate (PET). Method for ester (PBT) polyester resins. Background technique [0002] PET-based polyester is a general-purpose polymer material that is widely used in many fields, mainly 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 generated every year. [0003] In order to ensure sustainable development and full utilization of materials and reduce environmental pollution, in recent years, the recycling of waste PET polyester has received increasing attention from countries around the world. [0004] At present, the methods of waste PET material polyester (hereinafter referred to as waste PET) used...

Claims

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Application Information

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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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