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High melting index and low density polyethylene for ultrafine fiber leather

A low-density polyethylene and high-melt finger technology, which is applied in the direction of conjugated synthetic polymer artificial filaments, can solve the problems of wide molecular weight distribution of polyethylene, increased melt elasticity, and non-Newtonian enhancement of PE macromolecules. Achieve the effect of narrow molecular weight distribution, good economic benefits and high technical content

Active Publication Date: 2015-02-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the molecular weight distribution is too wide, the non-Newtonian properties of PE macromolecules will be enhanced, and the melt elasticity will become larger, which is unfavorable for spinning spinnability; at the same time, too wide molecular weight distribution will cause the crystallinity of the material to increase, which is unfavorable to the "dissolution" of PE.
[0004] At present, there are few domestic and foreign production processes that can industrially produce polyethylene special materials for microfiber leather, and the autoclave polymerization process is mainly used to produce polyethylene special materials for microfiber leather. The molecular weight distribution of polyethylene produced by this process is Wider, not conducive to the production of microfiber leather
However, the production of polyethylene special materials with narrow molecular weight distribution by the tubular high-pressure polymerization process has not been reported so far.

Method used

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  • High melting index and low density polyethylene for ultrafine fiber leather
  • High melting index and low density polyethylene for ultrafine fiber leather
  • High melting index and low density polyethylene for ultrafine fiber leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) After the ethylene gas is compressed by the reciprocating piston compressor, it is divided into two streams of main stream and side stream gas with a pressure of 230-240Mpa. The main feed gas, regulator and first initiator enter the first tubular reactor. The steam jacket is gradually heated to 175±10°C, and then the polymerization reaction is carried out in the reaction section, the polymerization temperature is controlled at 300-320°C, the pressure is 230-240Mpa, and the reaction time is 7-8 seconds; in the first tubular reactor , the first peroxidation is tert-butyl neodecanoate, the content is 1ppm, the second peroxide is 2-ethylhexanoic acid tert-butyl peroxide, the content is 4ppm, and the regulator-propionaldehyde content is 225ppm;

[0024] 2) The high-temperature reactant reaches a basic balance after being reacted, and after being cooled, it goes out of the first reaction zone and is combined with the side stream feed gas, the second initiator (compressed ai...

Embodiment 2

[0027] Concrete steps are with embodiment 1.

[0028] Among them: the pressure of the main and side stream feed gas is 235-245Mpa; in the first tubular reactor, the content of the first peroxide is 1.1ppm, the content of the second peroxide is 4.4ppm, and the content of the regulator propionaldehyde is 225ppm ; In the second reactor, the regulator propionaldehyde content is 150ppm, and the compressed air content is 17ppm; the temperature of the first reactor is controlled at 300-320°C, and the temperature of the second reactor is controlled at 300-320°C.

Embodiment 3

[0030] Concrete steps are with embodiment 1.

[0031] Among them: the main and side stream feed gas pressure is 230-240Mpa; in the first tubular reactor, the first peroxide content is 0.95ppm, the second peroxide content is 3.8ppm; the regulator propionaldehyde content is 230ppm , In the second reactor, the compressed air content is 16ppm, and the propionaldehyde content of the regulator is 160ppm; the temperature of the first reactor is controlled at 300-320°C, and the temperature of the second reactor is controlled at 300-320°C.

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Abstract

The invention belongs to the technical field of ultrafine fiber synthesized leather, and specifically relates to a high melting index and low density polyethylene for ultrafine fiber leather. The high melting point of the polyethylene is 190 DEG C, 2.16 kg, under 42-60 g / min, the density of the polyethylene is 0.915-0.924 g / cm3, and the molecular weight distribution index is 3 to 10. During the melting and spinning process, the high flowing performance of the polyethylene resin can be utilized to convert part of the polyethylene resin into ultrafine flows so as to produce normal mixed fibers, which can be extracted out by a specific solvent from common fibers; at the same time, the other part of the polyethylene resin is converted into ultrafine fibers to produce ultrafine fiber synthesized leather. The polyethylene is produced by a tubular type E-process high pressure polymerization technology apparatus through a special technological method, the technical content is high, and the polyethylene has a good economic profit.

Description

technical field [0001] The invention relates to the technical field of microfiber synthetic leather (microfiber leather), in particular to a high-melt finger and low-density polyethylene resin for microfiber leather developed by a high-pressure tubular production process. Background technique [0002] With the improvement of people's living standards, a new generation of superfine fiber synthetic leather has appeared in the international and domestic markets. It uses superfine fibers similar in structure and performance to the bundled collagen fibers in natural leather. It is made of polyurethane compound with microporous structure. The comprehensive performance of this microfiber leather is better than that of natural leather. [0003] The technical key to producing microfiber leather lies in the quality of polyethylene special materials. In the process of spinning ultrafine fibers, polyethylene should not only be normally mixed with polyamide (PA6) to form fibers of conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/38C08F2/38D01F8/06
Inventor 吴建东张海明陈国康孙旭辉徐文俊丁彬红
Owner CHINA PETROLEUM & CHEM CORP
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