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Easily biodegradable water-soluble polyester and preparation method thereof

A water-soluble polyester, biochemical degradation technology, applied in fiber types, textiles and papermaking, fiber treatment, etc., can solve problems such as high-efficiency sizing of polyester filaments, lower glass transition temperature, and low adhesion, etc., to achieve Suppression of parallelism, excellent copolymerization uniformity, and efficient sizing

Pending Publication Date: 2020-10-16
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN109485839A "A method for preparing water-soluble polyester by using three-monomer production process wastewater concentrate" is a water-soluble polyester slurry B / C prepared by condensing three-monomer wastewater, PTA, and EG through esterification and polymerization =0.0494, there is an appropriate amount of biodegradability, but compared with acid-thinned starch B / C=0.306, there is a big gap
Chinese patent CN110258114A "A preparation method of environmentally friendly textile size" proposes to blend starch, polyacrylate, urea, viscosity reducer and other components on the basis of water-soluble polyester size, and use the excellent biodegradability of starch to improve The size is biodegradable, but the adhesion to polyester filament starch is small, which does not meet the needs of high-efficiency sizing of polyester filament
However, the influence of the glass transition temperature on the product during actual use is very important, especially the use of aliphatic modified monomers will lead to a sharp drop in the glass transition temperature of the product, and the sizing film is greatly affected by the climate, and it is very easy to Causes the yarn after sizing to stick together

Method used

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  • Easily biodegradable water-soluble polyester and preparation method thereof
  • Easily biodegradable water-soluble polyester and preparation method thereof
  • Easily biodegradable water-soluble polyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of easily biodegradable water-soluble polyester in the present embodiment is as follows:

[0030] Step 1, one esterification

[0031] 5500kg of PTA, 2070kg of EG, 520kg of 1,4-BDO, 1.5kg of TMP and 2kg of Sb 2 o 3 Add it into the beating kettle, stir it evenly, and send it into the first esterification kettle through a metering pump to carry out the esterification reaction. The internal temperature of the first esterification kettle is 255°C, and the esterification pressure is normal pressure. The conversion rate is 80%, and a BHET esterification liquid is formed, and the material is introduced into the second esterification kettle by pressurizing nitrogen.

[0032] Step 2, Diesterification

[0033] After introducing the BHET esterification solution prepared in the first esterification kettle into the second esterification kettle, add 300L of normal temperature EG to the second esterification kettle to lower the temperature, lower the temperatu...

Embodiment 2

[0037]The preparation process of this example is the same as that of Example 1, the difference is that: the addition amount of EG in step 1 is 1870kg, the addition amount of 1,4-BDO is 720kg; the addition amount of dimethyl adipate prepolymer in step 2 is 2941kg (adipic acid solid content is 700kg).

Embodiment 3

[0039] The preparation process of this example is the same as that of Example 1, the difference is that the addition amount of EG in step 1 is 1670kg, and the addition amount of 1,4-BDO is 920kg; the addition amount of dimethyl adipate prepolymer in step 2 is 3361kg (adipic acid solid content is 800kg).

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Abstract

The invention discloses an easily biodegradable water-soluble polyester and a preparation method thereof. According to the present invention, terephthalic acid, sodium bis(2-hydroxyethyl)isophthalate-5-sulfonate, ethylene glycol, 1, 4-butanediol, an aliphatic dibasic acid modified monomer and other components are subjected to copolymerization modification to successfully prepare the high BOD5 / CODcr type water-soluble polyester with excellent biochemical degradability, meanwhile, an intermittent four-kettle process is adopted, a step-by-step polymerization process is realized, process parameters are optimized, a final product has the characteristics of easiness in sizing, easiness in desizing, high glass-transition temperature and the like, and the use requirements of efficient sizing and green desizing of polyester chemical fiber filaments, short fibers and polyester-nylon composite yarns are met.

Description

technical field [0001] The invention relates to a method for preparing a biochemically degradable water-soluble polyester, which belongs to the field of differential green polyester manufacturing. Background technique [0002] The purpose of yarn sizing is to increase the strength of the yarn, reduce hairiness, and thus improve weaving efficiency. Cotton-type fabrics are mainly based on PVA and modified starch, and chemical fiber-type sizing is mainly based on acrylic-type sizing. In recent years, with the successful development of water-soluble polyester sizing, such sizing has been used in the sizing of polyester chemical fiber filaments and staple fibers. Because its molecular chain structure unit is highly similar to polyester, it is used according to the principle of "similar compatibility". It has the characteristics of fast sizing and film formation, the sizing speed is 110% higher than that of acrylic size, and the weaving efficiency is greatly improved. Fabrics ne...

Claims

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Application Information

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IPC IPC(8): C08G63/688C08G63/78D06M15/507D06M101/32
CPCC08G63/6886C08G63/78D06M15/5075D06M2200/40D06M2101/32D06M2101/34
Inventor 许宏平高峰徐冬生欧阳勇军孟祥海张龙葛琳张传文龚春生连波
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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