Micro-nano fiber warm-keeping floc with longitudinally variable density structure and preparation method thereof

A micro-nanofiber and nanofiber technology, applied in textiles, papermaking, adhesives, non-woven fabrics, etc., can solve problems such as slow process, poor mechanical properties of nanofibers, and damage to nanofiber layers, achieving high porosity and improving heat preservation performance, effect of small pore size

Active Publication Date: 2021-10-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical properties of nanofibers are poor. Simply pasting nanofibers on the micron fiber mesh will not evenly distribute the nanofibers in the flakes, and will damage the nanofiber layer during use, which is not conducive to the effective improvement of performance
Another researcher constructs a very small mesh structure through the growth of bacterial cellulose, the backbone bacterial cellulose self-crosslinks to form a three-dimensional mesh structure skeleton, and makes the branched bacterial cellulose nanometer network on the skeleton to obtain nanofibers with small pores. net, but this method is mainly realized through biochemical synthesis, the process is relatively slow, it is difficult to manufacture in batches, and it cannot be used for the industrial application of thermal fiber wadding

Method used

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  • Micro-nano fiber warm-keeping floc with longitudinally variable density structure and preparation method thereof
  • Micro-nano fiber warm-keeping floc with longitudinally variable density structure and preparation method thereof

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preparation example Construction

[0054] A method for preparing a micro-nano fiber warm-keeping floc with a longitudinally variable density structure, comprising the following steps:

[0055] The first step: according to the different ratios required by the bottom layer fiber web, the middle layer fiber web and the surface layer fiber web, the initially opened micron fibers and nano fibers are further opened and mixed evenly by a pre-opener and a fine opener respectively to obtain Three different ratios of micro-nano mixed fiber raw materials;

[0056] Step 2: Using three vibrating cotton feeding machines, three kinds of mixed fiber raw materials with different proportions are made into uniform and dense mat cotton and fed to the carding machine respectively, and three kinds of thin fiber webs with different nanofiber contents are obtained by carding;

[0057] Step 3: Connect three web-laying machines in series, and lay webs corresponding to three types of thin webs with different nanofiber contents in the ord...

Embodiment 1

[0065] A method for preparing a micro-nano fiber warm-keeping floc with a longitudinally variable density structure, specifically: grabbing 25wt% of micron-sized thick hollow fibers, 55wt% of micron-sized fine fibers and 20wt% of nanofibers and mixing them uniformly at 850r Opening at the opening roller speed of / min, followed by carding to obtain the bottom fiber web and the surface layer fiber web; at the same time, grab 20wt% of micron-sized thick hollow fibers, 50wt% of micron-sized fine fibers and 30wt% of nanofibers and mix them evenly After opening, the speed of the opening roller is also 850r / min, followed by carding to obtain the middle layer fiber web. Among them, the micron-scale thick hollow fiber is a polyester fiber with a diameter of 22 μm, a hollowness of 75%, and a length of 33 mm; the micron-scale fine fiber is a polyethylene fiber with a diameter of 8 μm and a length of 32 mm; the nanofiber is ethyl cellulose The fiber is 300 nm in diameter and 30 mm in leng...

Embodiment 2

[0070] The same method as in Example 1 was used to prepare micro-nanofiber flakes, wherein the micron-sized thick hollow fibers of the bottom fiber web and the surface layer fiber web accounted for 28wt%, micron-sized fine fibers accounted for 52wt%, and nanofibers accounted for 20wt% ; The fiber net of the middle layer accounts for 22wt% of the thick hollow fibers of the micron scale, 47wt% of the fine fibers of the micron scale, and 31wt% of the nanofibers. Micron-sized thick hollow fibers are polypropylene fibers with a diameter of 25 μm, a hollowness of 73%, and a length of 31 mm; micron-sized fine fibers are polyaniline fibers with a diameter of 9 μm and a length of 33 mm; nanofibers are polystyrene fibers with a diameter of It is 350nm and the length is 31mm. The opening roller speed is 900r / min, the web laying speed is 23m / min, the composite fiber web layer is output at a speed of 6m / min, and the PVC adhesive is 16g / m 2 The amount of spraying is added to the composite ...

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Abstract

The invention relates to a micro-nano fiber warm-keeping wadding sheet with a longitudinally variable density structure and a preparation method thereof. The wadding sheet is composed of a bottom layer fiber web, a middle layer fiber web and a surface layer fiber web, and the nanofiber content of the surface layer and the bottom layer fiber web is relatively low , the content of nanofibers in the middle layer web is relatively high. The upper and lower layers contain more hollow micron fibers, which can store a large amount of still air and improve the thermal performance of the flakes. At the same time, they have a skeleton support function and endow the flocs with mechanical properties; the middle layer has more nanofibers, which can reduce flocs. The internal aperture of the sheet reduces the effect of air flow, which can effectively store still air and improve thermal performance. The thermal bonding treatment is carried out on the composite fiber web layer obtained by laying the net, so that the bonding between the fiber webs and between the fibers occurs, and the fiber flakes are endowed with excellent compression resilience properties.

Description

technical field [0001] The invention belongs to the field of non-woven technology, and relates to a micro-nano fiber warm-keeping floc with a longitudinally variable density structure and a preparation method. Background technique [0002] Alpine weather not only easily leads to frostbite of the human body, but also easily causes diseases of the respiratory system and cardiovascular and cerebrovascular systems. Therefore, high-efficiency thermal clothing is required to withstand severe cold weather. At present, the commonly used high-efficiency thermal insulation materials are mainly down fibers, which have extremely low thermal conductivity and ultra-light properties close to the air, but their performance drops sharply after moisture absorption and their high price limits the wide-scale use of materials; in recent years, 3M Corporation of the United States , DuPont, etc. have released a series of synthetic fiber thermal insulation wadding, which has good resilience, but i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/02D04H1/541D04H1/559D04H1/4382D04H1/593D04H1/544D04H1/55D04H1/549D04H1/587D04H1/4391
CPCD04H1/02D04H1/4382D04H1/4391D04H1/541D04H1/544D04H1/549D04H1/55D04H1/559D04H1/587D04H1/593
Inventor 丁彬吴红炎王赛田昱城赵磊郑作保斯阳印霞刘一涛俞建勇
Owner DONGHUA UNIV
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