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Process for preparing PBT plastic

A production process and plastic technology, which is applied in the field of PBT plastic production process, can solve the problems of difficult processing, slow crystallization speed of PBT plastic, poor impact resistance and other problems, and achieve easy processing, good dimensional stability and strong impact resistance. Effect

Inactive Publication Date: 2015-01-21
中山市鸿程科研技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses PBT as a carrier and adds auxiliary materials such as halogen-free flame retardants, toughening agents, compatibilizers, and glass fibers to make high-performance environmentally friendly modified PBT, which can improve the fire resistance and physical properties of products and achieve Halogen-free and phosphorus-free environmental protection requirements, in line with industrial use, does not contain I, Br, no harm to the environment and human health, but the PBT plastic has slow crystallization speed, poor impact resistance, and is not easy to process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of manufacturing process of PBT plastic of the present embodiment, its processing step is as follows:

[0020] (1) Raw material preparation; under the conditions of reaction temperature 200--350℃ and reaction pressure 1.5--2MPa, use zinc hydroxide as catalyst to make high-purity polyethylene terephthalate from crude polyethylene terephthalate Ethylene glycol formate (PTA), whose purity is 85%;

[0021] (2) mixing; the polyethylene terephthalate prepared in step (1) is mixed with 1,4-butanediol, and the polyethylene terephthalate and 1,4-butanediol The mass ratio of alcohol is 1:1.2--2.2, and precipitated calcium carbonate is added in the mixed solution, and the mass content of the precipitated calcium carbonate is 4%--4.8%;

[0022] (3) Catalyzed reaction; add a catalyst to the mixture of step (2), under the action of the catalyst, polyethylene terephthalate and 1,4-butanediol undergo an exchange reaction, and the pH is controlled to be 6-- 7. The catalyst is c...

Embodiment 2

[0026] Embodiment 2: the rest are the same as the embodiment 1, the difference is that the mass ratio of polyethylene terephthalate and 1,4-butanediol in step (2) is 1:1.5, and the step ( 3) The dosage of the catalyst is 0.02% of the mass of polyethylene terephthalate, and the dosage of sodium benzoate in step (6) is 1.2% of the mass of polyethylene terephthalate.

Embodiment 3

[0027] Embodiment 3: the rest are the same as the embodiment 1, the difference is that the mass ratio of polyethylene terephthalate and 1,4-butanediol in step (2) is 1:2, and the step ( 3) The dosage of the catalyst is 0.01% of the mass of polyethylene terephthalate, and the dosage of sodium benzoate in step (6) is 1.2% of the mass of polyethylene terephthalate.

[0028] In the above-mentioned three kinds of embodiments, polycondensation reaction takes place under the condition of high vacuum and strong stirring, the utilization rate of reactant polyethylene terephthalate butyl reaches more than 85%, and the polyethylene terephthalate added in catalytic reaction The conversion rate of ethylene glycol ester reaches over 90%, and the use of crystallization accelerator increases the crystallization rate of the product by more than 2 times.

[0029] It can be known from practical application that the production of raw materials goes through six steps of preparation, mixing, cataly...

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PUM

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Abstract

The invention discloses a process for preparing PBT plastic. The process comprises the following steps: (1) preparing raw materials; (2) mixing; (3) carrying out a catalytic reaction; (4) molding; (5) modifying; and (6) crystallizing and separating. After a series of treatment on raw materials, the PBT plastic has the advantages of excellent physico-mechanical property, excellent electric insulation performance, creep resistance, fatigue resistance, friction resistance and high size stability in a relatively wide temperature range, is quick in crystallization speed and easy to mold and process, and has the characteristics of relatively strong impact resistance and the like.

Description

[0001] technical field [0002] The invention relates to chemical technology, in particular to a manufacturing technology of PBT plastics. Background technique [0003] At present, plastics have been widely used in the construction industry, packaging materials, household daily necessities and automobiles and other fields. Because of its wide range of uses and good performance, plastics constitute one of the four basic materials of modern industry with steel, wood, and cement. PBT plastics are polyethylene terephthalate plastics, commonly known as Polyester resin, which is a condensation polymer of polyethylene terephthalate and ethylene glycol, is collectively referred to as thermoplastic polyester or saturated polyester together with PET. The molecular structure of PBT plastic is highly symmetrical and has a certain crystallization orientation ability. Therefore, it has high film forming and forming properties. PBT plastics have good optical properties and weather resista...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L75/14C08K3/26C08K5/098C08G63/183C08G63/78
Inventor 李丽娟王建武
Owner 中山市鸿程科研技术服务有限公司