Manufacturing method of hydrophilic polyester short fibers for directly spinning spun-laced non-woven fabric

A technology of polyester staple fiber and non-woven fabrics, which is applied in the field of synthetic fibers, and can solve the problem of poor uniformity of treatment agents on the fiber surface and weak adhesion fastness, reduced uniformity of physical and mechanical properties of non-woven fabrics, and processing of spunlace non-woven fabrics. Efficiency reduction and other problems, to achieve the effect of obvious hydrophilic effect, improved hydrophilic effect, and low production cost

Active Publication Date: 2015-02-04
JIANGSU JIANGNAN HIGH POLYMER FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At this stage, the chemical hydrophilic modification technology of polyester PET is mature, but the modified masterbatch blending or intermittent chip melt spinning is mainly used, which has relatively high production costs and uneven fiber quality; the large-capacity direct spinning technology is also very mature , the daily output of staple fiber can reach 300 tons, the production efficiency is high, and the production cost is low, but the main product target is the fiber for ring spinning or air spinning, and the requirements for the exfoliation on the fiber surface are relatively low. Therefore, the actual PET melting The content of cyclic trimers in the body is relatively high, reaching more than 0.8wt%. After spinning and stretching heat setting, these cyclic trimers will migrate to the surface of the fiber and peel off under external force. Usually these peelings The content of the exfoli

Method used

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  • Manufacturing method of hydrophilic polyester short fibers for directly spinning spun-laced non-woven fabric
  • Manufacturing method of hydrophilic polyester short fibers for directly spinning spun-laced non-woven fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method for manufacturing hydrophilic polyester staple fibers for direct spinning spunlace nonwovens, the steps include:

[0026] Esterification: Purified terephthalic acid (PTA) and ethylene glycol (EG) are used as raw materials, PTA and EG are prepared according to the molar ratio of 1:1.12 to 1:1.3 for continuous slurry preparation, and esterification tanks are continuously provided for esterification , control the esterification reaction temperature at 261-270°C, and enter the pre-condensation process after the esterification rate exceeds 95%.

[0027]Pre-condensation: In the polymerization production line with a daily output of 200 tons of PET, a certain amount of polycondensation catalyst (antimony ethylene glycol) and matting agent (TiO 2 ), and increase the injection of PEG prepared in EG in the above-mentioned pipeline, the molecular weight is 2000, the addition amount is 0.8%wt of polyester, the pre-condensation reactor is under negative pressure, controlle...

Embodiment 2

[0036] The steps of this example are basically the same as those of Example 1, except that the molecular weight of PEG added in the pre-condensation process is 1500, and the amount added is 1.0%wt of polyester. And the composition of fiber surface finishing agent comprises:

[0037] (1) the aliphatic long-chain ester obtained by the reaction of aliphatic acid and alcohol accounts for 40%wt of the total amount of finishing agent;

[0038] (2) long-chain alkyl polyoxyethylene ether sodium sulfate, accounting for 15%wt of the total amount of finishing agent;

[0039] (3) Fatty alcohol polyoxyethylene ether, accounting for 45%wt of the total amount of the finishing agent.

Embodiment 3

[0041] The steps of this example are basically the same as those of Example 1, the difference being that the molecular weight of PEG added in the pre-polycondensation process is 1800, and the addition amount is 0.5%wt of polyester. And the composition of fiber surface finishing agent is:

[0042] (1) The aliphatic long-chain ester obtained by the reaction of aliphatic acid and alcohol accounts for 30%wt of the total amount of finishing agent;

[0043] (2) long-chain alkyl polyoxyethylene ether sodium sulfate, accounting for 30%wt of the total amount of finishing agent;

[0044] (3) Fatty alcohol polyoxyethylene ether, accounting for 40%wt of the total amount of the finishing agent.

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Abstract

The invention provides a manufacturing method of hydrophilic polyester short fibers for directly spinning a spun-laced non-woven fabric. The manufacturing method comprises the following steps: carrying out esterification on polyester slurry, carrying out pre-condensation polymerization, carrying out final condensation polymerization, spinning and carrying out after-finishing. In a pre-condensation polymerization process, comonomer polyethylene glycol PEG is added, the molecular weight of the added PEG is 1500-2000, and the adding amount is 0.5wt%-1.0wt% of a polyester melt. The temperature of the melt obtained by the final condensation polymerization is controlled to be lower than 290 DEG C, so that the quantity of generated annular tripolymers is reduced and the spun-laced processing efficiency of the fibers is improved. A hydrophilic modifier is added in an online polyester synthetic process and the polyester melt is directly used for spinning; the production cost is lower compared with the production cost of chip spinning, the quality uniformity of the short fibers is improved by 50% and the hydrophilic effect is obvious; eight paths of surface treatment are carried out, so that the distribution of a fiber surface finishing agent is uniform and the attaching firmness is improved; the fiber surface hydrophilic effect is improved in a spun-laced processing process; and the polyester PET short fibers can be used for completely replacing mucilage glue short fibers to be used as production raw materials of the non-woven fabric, so that the whole cost of the non-woven fabric is reduced.

Description

technical field [0001] The invention relates to a method for manufacturing hydrophilic polyester short fibers for direct spinning spunlace nonwoven fabrics, belonging to the technical field of synthetic fibers. Background technique [0002] Polyester fibers, especially PET staple fibers, have been used in the field of non-woven fabrics (Non-Woven) since the 1980s. They are mainly used in needle punching, chemical binders, and hot-melt bonding to form non-woven fabrics. The spunlace process is a major technological breakthrough in the non-woven industry. Many extremely fine high-pressure water needles are sprayed vertically to the fiber mesh supported on the polyester monofilament mesh or metal curtain mesh, so that the fibers are subjected to high-pressure water flow (also known as water needles). The role of entanglement and reinforcement, forming a spunlace nonwoven fabric. [0003] Compared with non-woven fabrics formed by metal needle punching or chemical or hot-melt re...

Claims

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Application Information

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IPC IPC(8): D01F6/92D01F1/10D01D5/08D01D5/088D01D5/096D06B3/04D02J1/22D06B1/02D06M13/224D06M15/53D06M101/32
Inventor 浦金龙陶国平
Owner JIANGSU JIANGNAN HIGH POLYMER FIBER
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