Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method that can stably produce PBT resin in a long period

A PBT resin, stable production technology, applied in the polyester field, can solve the problems of short production cycle and high production cost of PBT, and achieve the effect of reducing production cost, stable properties and easy storage

Active Publication Date: 2021-08-06
DONGHUA UNIV
View PDF17 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention provides a preparation method for long-term stable production of PBT resin. Specifically, terephthalic acid and 1,4-butanediol are used as main raw materials for melt polymerization reaction, and the catalyst used in the polymerization reaction is an organic chelate water-resistant Decomposition catalyst; the purpose is to solve the problem of using tetrabutyl titanate as a catalyst in the synthesis of PBT, resulting in the long-term formation of precipitated products with esterification water, making the production cycle of PBT short and the production cost high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method that can stably produce PBT resin in a long period
  • A kind of preparation method that can stably produce PBT resin in a long period
  • A kind of preparation method that can stably produce PBT resin in a long period

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A preparation method that can stably produce PBT resin in a long period, the specific steps are as follows:

[0056] (1) Stir 1,4-butanediol and basic metal compound (zinc acetate) at 40°C for 1 hour, and add tetrabutyl titanate dropwise for 2 hours. After the dropwise addition, the temperature is raised to 80°C. After stirring and reacting for 2 h, the temperature was lowered to room temperature to obtain solution I; EDTA and industrial ammonia with a mass concentration of 25% were stirred at 30° C. for 1 h to obtain solution II; solution II was added dropwise to solution I , the dropwise addition time is 2h, after the dropwise addition, the temperature is raised to 70 °C and stirred for 1h, and the low-boiling substances are extracted, cooled to room temperature, and stirred for 1h to finally obtain a homogeneous and clear organic chelating hydrolysis-resistant catalyst; The added amount is: the molar ratio of 1,4-butanediol and tetrabutyl titanate is 2:1; the molar r...

Embodiment 2

[0074] A preparation method that can stably produce PBT resin in a long period, the specific steps are as follows:

[0075] (1) Stir 1,3-propanediol and basic metal compound (zinc hydroxide) at 50°C for 0.1h, and add tetrabutyl titanate dropwise for 3h. After the dropwise addition, the temperature is raised to 70°C. After stirring and reacting for 1 h, the temperature was lowered to room temperature to obtain solution I; EDTA and industrial ammonia with a mass concentration of 25% were stirred at 40° C. for 1 h to obtain solution II; solution II was added dropwise to solution I , the dropwise addition time was 1h, after the dropwise addition was completed, the temperature was raised to 60°C and stirred for 2h, and the low-boiling point substances were extracted, cooled to room temperature, and stirred for 0.1h to finally obtain a homogeneous and clear organic chelating hydrolysis-resistant catalyst; The added amount is: the molar ratio of 1,3-propanediol and tetrabutyl titanat...

Embodiment 3

[0086] A preparation method that can stably produce PBT resin in a long period, the specific steps are as follows:

[0087] (1) ethylene glycol and basic metal compound (copper acetate) were stirred at 30°C for 3h, and tetrabutyl titanate was added dropwise for 5h. After the dropwise addition, the temperature was raised to 60°C and the reaction was stirred for 4h. , the temperature was lowered to room temperature to obtain solution I; EDTA and industrial ammonia with a mass concentration of 25% were stirred at 20 ° C for 1 h to obtain solution II; solution II was added dropwise to solution I, and the time was added dropwise After the dropwise addition, the temperature was raised to 50 °C and stirred for 3 hours, and the low-boiling substances were extracted, cooled to room temperature and stirred for 2 hours to finally obtain a homogeneously clear organic chelating hydrolysis-resistant catalyst; wherein, the addition amount of each substance was: The molar ratio of ethylene gl...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
transmittivityaaaaaaaaaa
transmittivityaaaaaaaaaa
transmittivityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method capable of stably producing PBT resin for a long period of time. Terephthalic acid and 1,4-butanediol are used as main raw materials for melt polymerization reaction, and the catalyst used in the polymerization reaction is an organic chelating hydrolysis-resistant catalyst The preparation process of the organic chelating hydrolysis-resistant catalyst is: (1) after mixing 1,4-butanediol and the basic metal compound, add tetrabutyl titanate dropwise to obtain solution I; (2) mix EDTA and industrial ammonia are mixed under condition II to obtain solution II; (3) finally solution II is added dropwise to solution I to obtain an organic chelating hydrolysis-resistant catalyst; the intrinsic viscosity of the prepared PBT resin is greater than 0.9 deciliters / gram, b value is less than 6; And the thermal cleaning cycle of the reaction device in the described three-still process flow system is greater than 12 months; year or even half a year) to run the problem.

Description

technical field [0001] The invention belongs to the technical field of polyester, and relates to a preparation method capable of stably producing PBT resin in a long period. Background technique [0002] Polybutylene terephthalate (PBT) is a crystalline linear saturated polyester and a thermoplastic material. It is widely used in electronic and electrical components due to its easy processing and molding, excellent electrical properties, mechanical properties and heat resistance. , automotive, mechanical equipment and optical fiber and other fields. Films, sheets, fibers and other fields are also gradually widely used. [0003] The synthesis of PBT is mostly direct esterification, using tetrabutyl titanate (TBT, the molecular formula is Ti (OCH) 3 ) 4 ) as a catalyst, the reaction scheme of the esterification process is shown in the formula (1): [0004] [0005] It can be seen from the formula (1) that PBT will generate a large amount of esterified water in the ester...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/85C08G63/83C08G63/183
CPCC08G63/183C08G63/83C08G63/85
Inventor 关震宇张玉梅王华平
Owner DONGHUA UNIV