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A kind of flame-retardant polyester and its manufacturing method

A technology for flame-retardant polyester and its manufacturing method, which is applied in the field of flame-retardant polyester and its manufacture, which can solve the problems of fiber melting point drop, high phosphorus content, high flame retardancy, and discounted hand feeling, etc., and achieve superior friction resistance , Excellent dry heat shrinkage rate, good flame retardant effect

Active Publication Date: 2017-12-08
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regarding flame-retardant fiber products with a phosphorus content of more than 8000ppm, although there are related technical introductions, as the amount of copolyphosphorus compounds increases, the crystallinity of polyester decreases, and the melting point of polyester decreases significantly, resulting in an increase in fiber shrinkage. The final product is greatly compromised in feel
[0004] Chinese patent application CN201110073511.2 discloses a flame-retardant polyester fiber and its production method, wherein the phosphorus content is 5000-7500ppm, and the DEG content is below 2.5wt%. Compared with flame retardant varieties with phosphorus content above 8000ppm, there is still a certain gap
In this patent, the melting point of polyester fiber is controlled by controlling DEG content below 4mol% (equivalent to 2.2wt%) so that it will not be too low, but once the phosphorus content in polyester fiber exceeds 8000ppm, excessive phosphorus compounds will still This leads to a serious drop in the melting point of the fiber. Although this polyester fiber has good flame retardancy, its shrinkage rate is relatively high, which affects the feel of the fabric and greatly limits its application.
This patent does not give a method and hint for maintaining high processing performance of polyester while having high phosphorus content and high flame retardancy

Method used

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  • A kind of flame-retardant polyester and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The ethylene glycol esterification solution of the flame retardant is prepared for use, and the flame retardant shown in formula 4 is mixed with ethylene glycol to prepare an esterification solution A with a phosphorus content of 5.8wt% and an acid value of 76mgKOH / g.

[0045] After esterifying 1150g of terephthalic acid and 530g of ethylene glycol, add 215g of the above-mentioned flame retardant esterification solution A before the polymerization reaction. The addition temperature is controlled at 210°C, and the flame retardant and polymerization catalyst B are added within 50 minutes. Antimony glycol and phosphorus compound stabilizers, the system reaches a full vacuum below 200Pa after 40 minutes, the polymerization start temperature is 210°C, and the final polymerization temperature is 285°C 120 minutes after the start of heating. In the finally obtained polyester, relative to the total amount of flame retardant polyester, the content of phosphorus element was 8012pp...

Embodiment 2

[0048] Add 270g of esterification solution A before the polymerization, and the others are the same as in Example 1. The content of phosphorus in the obtained flame-retardant polyester is 10025ppm, and the content of DEG is 1.7wt%. Other results are shown in Table 1.

Embodiment 3

[0050] Add 330g of esterification solution A before the polymerization, and the others are the same as in Example 1. The phosphorus content in the obtained flame-retardant polyester is 12019ppm, and the DEG content is 1.8wt%. Other results are shown in Table 1.

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Abstract

The invention relates to flame-retardant polyester and a producing method thereof. The flame-retardant polyester comprises a phosphorous compound structure unit, wherein the content of phosphorus is in a range of 8,000-12,000 ppm and the content of diglycol is lower than 2.0wt% when compared with the total amount of the flame-retardant polyester. The polyester is mainly prepared from terephthalic acid and glycol through an esterification reaction and a polymerization reaction, a phosphorus-containing flame retardant is added after the esterification reaction is finished and before the polymerization reaction is started, and the temperature in a polymerization kettle is controlled to range from 210 DEG C to 230 DEG C during addition of the flame retardant. The polyester is excellent in flame-retardant performance and good in crystallinity and keeps the melting point of ordinary polyester. Fibers produced from the polyester are excellent in dry heat shrinkage and applicable to nonflammable materials such as curtains and the like.

Description

technical field [0001] The invention relates to a flame-retardant polyester with high phosphorus content and a manufacturing method thereof. Background technique [0002] Polyester fibers, represented by polyethylene terephthalate, are widely used to make clothing materials due to their excellent mechanical strength and heat resistance. However, since polyester fiber is combustible, its application in fields requiring flame retardancy is greatly limited. With the improvement of people's awareness of fire protection, the research and application of flame-retardant polyester fibers are becoming more and more active all over the world, and various flame-retardant polyester fiber products are constantly coming out. [0003] At present, most of the flame retardants used in polyester fibers are phosphorus-containing flame retardants, and the existing production technology of flame-retardant fibers is becoming more and more mature. The current flame-retardant polyester fabrics ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/692C08G63/78D01F6/84
Inventor 柏立军李旭望月克彦
Owner TORAY FIBER RES INST(CHINA) CO LTD
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