A method of using pet to produce flat yarn

A technology of flat yarn and polyester chips, which is applied in stretch spinning, rayon manufacturing, single-component polyester rayon, etc., and can solve the problems of flat yarn slitting surface damage, flat yarn temperature unevenness, heat transfer efficiency, etc. Low-level problems, to achieve the effect of improving melt strength and toughness, reducing crystallization, and preventing brittle fracture

Active Publication Date: 2016-08-24
ZHEJIANG WANKAI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cutting knife will cause damage to the cut surface of the flat yarn, and the hot plate heating and drawing method with low heat transfer efficiency is still used, resulting in uneven temperature on the upper and lower surfaces of the flat yarn

Method used

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  • A method of using pet to produce flat yarn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix PET polyester bag-packed basic slices and additives in a high-speed mixer according to a certain ratio, and send them to the slice hopper 1 by the vacuum conveying system for use in the crystallizer 2, and the slices fall into the crystallizer by their own weight. The crystallizer is heated with hot air at 140° C., and the residence time of the chips in the crystallizer 2 is 20 minutes. The pre-crystallized slices are continuously and evenly fed into the drying tower 3, and the slices are further dehydrated and dried with hot air at 160°C in the drying tower 3. The time is about 5 hours. After drying, the moisture content of the slices is 25ppm. The chips enter the parallel twin-screw extruder 4. The above-mentioned additives are toughening agent MG-801 (a vinyl elastomer bifunctionalized with acrylate and glycidyl ester, provided by Hangzhou Qitai Plastic Material Co., Ltd.), antioxidant IRGANOX1010 (tetra[β-(3,5- Di-tert-butyl-4-hydroxyphenyl) propionic acid]...

Embodiment 2

[0033](1) Mix PET polyester bagged basic slices and additives in a high-speed mixer according to a certain ratio, and send them to the slice hopper by the vacuum conveying system for use in the crystallizer, and the slices fall into the crystallizer by their own weight. The crystallizer is heated with hot air at 130° C., and the residence time of the chips in the crystallizer is 20 minutes. The pre-crystallized slices are continuously and evenly fed into the drying tower, and the slices are further dehydrated and dried with hot air at 180°C in the drying tower for about 4.5 hours. The moisture content of the slices after drying is 30ppm, and the slices after drying enter the parallel twin-screw extruder. The above-mentioned additives are toughening agent MG-801 (a vinyl elastomer bifunctionalized with acrylate and glycidyl ester, provided by Hangzhou Qitai Plastic Material Co., Ltd.), antioxidant IRGANOX168 (tris(2,4-diphosphite) tert-butylphenyl) ester, Zhejiang Jinhai Chemi...

Embodiment 3

[0040] (1) Mix PET polyester bagged basic slices and additives in a high-speed mixer according to a certain ratio, and send them to the slice hopper by the vacuum conveying system for use in the crystallizer, and the slices fall into the crystallizer by their own weight. The crystallizer is heated with hot air at 150°C, and the residence time of the chips in the crystallizer is 20 minutes. The pre-crystallized slices are continuously and evenly fed into the drying tower, and the slices are further dehydrated and dried with hot air at 170°C in the drying tower for about 4 hours. The moisture content of the slices after drying is 35ppm, and the slices after drying enter the parallel twin-screw extruder. The above-mentioned additives are toughening agent MG-801 (a vinyl elastomer bifunctionalized with acrylate and glycidyl ester, provided by Hangzhou Qitai Plastic Material Co., Ltd.), antioxidant IRGANOX168 (tris(2,4-diphosphite) tert-butylphenyl) ester, Zhejiang Jinhai Chemical...

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Abstract

The invention discloses a preparation method for producing flat filaments by using PET (Polyethylene Terephthalate). The method comprises the following steps: (1) slicing PET polyester, mixing the sliced PET polyester with a toughening agent, an antioxidant and a filler, and feeding the dried slices into a screw extruder; (2) performing melt blending on the dried slices in the screw extruder at the temperature of 250-290 DEG C in the screw extruder, and performing a chain extension reaction; (3) cooling a melt in the presence of an adsorption system to obtain thick sheets; (4) heating the thick sheets obtained in the step (3) and stretching the thick sheets to obtain primary flat filaments, wherein stretching is carried out in two steps; (5) further cooling and flattening the primary flat filaments, performing electrostatic elimination treatment, and coiling. Compared with the prior art, the PET flat filaments produced by using the method is over 200MPa in the tensile strength and lower than 50 percent in the elongation at break, and can be applied to the field of high-performance woven bags and flexible freight bags.

Description

technical field [0001] The invention belongs to the field of polymer material processing, in particular to a preparation method for producing high-performance flat yarns by using PET. Background technique [0002] At present, the plastic woven bags produced, sold and used at home and abroad all use polypropylene resin (PP) as raw material to make flat yarns, and then weave them into woven bags for packaging items. Because polypropylene woven bags are easy to separate from the packaging, light in weight and low in cost, they have been widely used in the packaging of large-scale products such as chemicals, mineral powders, building materials and grains. However, due to the poor weather resistance and easy oxidation of PP, it leads to its oxidative degradation. During the storage process, the mechanical strength of the woven bag, especially the impact strength, is greatly reduced, which affects the packaging effect. The performance of polyester (PET) woven bags is superior to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/92D01F1/10D01D5/12
Inventor 郑兵章延举邱增明
Owner ZHEJIANG WANKAI NEW MATERIAL
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