A kind of production method of environment-friendly size polyester for fabric sizing

A production method and environment-friendly technology, applied in the field of polyester production, can solve the problems of unstable production operation, difficult to judge the reaction end point, complex and cumbersome process, etc., and achieve the effect of simple and feasible operation, saving manpower and material resources, and simple process flow

Active Publication Date: 2017-03-29
湖北尚助化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing production methods of water-soluble polyester products have many defects such as relatively complex and cumbersome processes, difficulty in judging the end point of the reaction, and unstable production operations.

Method used

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  • A kind of production method of environment-friendly size polyester for fabric sizing
  • A kind of production method of environment-friendly size polyester for fabric sizing
  • A kind of production method of environment-friendly size polyester for fabric sizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of production method of the environment-friendly size polyester that is used for fabric sizing of the present invention is as follows:

[0038] (1), beating

[0039] Put a certain amount of ethylene glycol (EG) into the beating kettle from the ethylene glycol head tank, and put an appropriate amount of terephthalic acid (PTA, solid) into the beating kettle evenly under stirring to make a slurry; Wherein, the mass ratio of terephthalic acid and ethylene glycol is 567:35, that is, the mass ratio of PTA and EG is 567:35.

[0040] On the pipeline from the ethylene glycol head tank to the beating kettle, another bypass is connected to the ethylene glycol flushing tank. There is a certain pressure (0.2MPa) in the ethylene glycol flushing tank. The purpose of setting up the glycol flushing tank is: When the feed pump stops feeding, press in ethylene glycol to flush the feed pump to prevent the terephthalic acid slurry from depositing in the feed pump and prevent the fe...

Embodiment 2

[0056] A kind of production method of the environment-friendly size polyester that is used for fabric sizing of the present invention is basically the same as embodiment 1, the difference is: the pressure in the ethylene glycol washing tank is 0.25MPa; the mass ratio of PTA and EG is 567 : 38; Esterification reaction temperature 255°C; Esterification reaction pressure: absolute pressure 75KPa; Polycondensation reaction temperature 260°C; Polycondensation reaction pressure: Vacuum degree ≤ 70Pa in low vacuum stage, vacuum degree in high vacuum stage 100Pa.

Embodiment 3

[0058] A kind of production method of the environment-friendly size polyester that is used for fabric sizing of the present invention is basically the same as embodiment 1, the difference is: the pressure in the ethylene glycol washing tank is 0.3MPa; the mass ratio of PTA and EG is 567 : 40; Esterification reaction temperature 265°C; Esterification reaction pressure: absolute pressure 90KPa; Polycondensation reaction temperature 285°C; Polycondensation reaction pressure: Vacuum degree ≤ 70Pa in low vacuum stage, vacuum degree in high vacuum stage 150Pa.

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Abstract

The invention provides a production method of an environment-friendly polyester slurry. The production method comprises the following steps: (1) putting right amounts of ethylene glycol and terephthalic acid into a slurrying kettle, and stirring into a slurry; (2) carrying out esterification reaction on the slurry in an esterification kettle at 255-265 DEG C, sending the water generated by esterification and volatile ethylene glycol into a fractionating column to perform separation, and controlling the column top temperature by a column top condenser water inlet regulating valve and an external reflux regulating valve, thereby separating out the esterification water; weighing the obtained esterification water, and judging that the esterification reaction is finished when the weighed water is greater than or equal to 95 wt% of the theoretical generated water; (3) polycondensation reaction: carrying out two steps in a vacuum state, and judging the end point of the polycondensation reaction according to the stirring power of the polycondensation reaction kettle; and (4) granulating or slicing. The production method has the advantages of simple technique and stable operation. By adopting the process of judging the end point of the polycondensation reaction according to the stirring power of the polycondensation reaction kettle, the production method is simple, feasible and easy to operate in mass production, and saves the human resources and material resources.

Description

technical field [0001] The invention belongs to the technical field of polyester production, and relates to a production method of environment-friendly size polyester used for fabric sizing. Background technique [0002] As early as the last century, Western Europe just controlled the entry of textiles sizing with unclean pulp PVA (polyvinyl alcohol) in my country, and, from the needs of our country to protect its own environment, it also improved not to use or use less PVA pulp. Environmentally-friendly water-soluble polyester products overcome many shortcomings of using PVA and other water-soluble polyester products. They have high molecular weight, strong adhesion, good water solubility, excellent film-forming properties, low viscosity, moderate hygroscopicity, and slurry fluidity. Good, less foam, easy to degrade and other characteristics, it is a new type of environmental protection product. [0003] The existing production methods of water-soluble polyester products h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/78D06M15/507
Inventor 汪学玉张天峰傅瑞芳
Owner 湖北尚助化学有限公司
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