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Preparation method of crease-free superfine fiber synthetic leather based on thermal expansion microspheres

A technology of thermally expanding microspheres and ultra-fine fibers, applied in textiles and papermaking, etc., can solve the problems of decreased softness of dry TPU film, and achieve the effect of improving plumpness, large adjustment space and improving vapor permeability.

Inactive Publication Date: 2021-01-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing non-crease microfiber synthetic leather based on thermally expandable microspheres for the deficiencies of the prior art. The microfiber synthetic leather obtained by the preparation method has a hollow microsphere structure inside, Therefore, the pressing resilience is good, not only has the characteristics of plumpness, fast rebound, and no creases, but also solves the disadvantage of softness reduction caused by dry TPU film, and also has good vapor and moisture permeability, which can be widely used Used as clothing leather, shoe leather, bag leather, sofa leather, automobile, ship, aircraft cushion leather, home decoration leather, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] (1) Preparation of heat-expandable microspheres

[0025] Adjust the speed of the high-shear disperser to 8000rpm, and make up 10 parts of acrylonitrile, 5 parts of methyl methacrylate, 0.1 part of ethylene glycol dimethacrylate, 0.2 parts of azobisisobutyronitrile, and 5 parts of isopentane The mixed monomer is dispersed in an aqueous medium consisting of 50 parts of deionized water, 5 parts of silica sol with a solid content of 30wt%, 10 parts of sodium chloride, 0.01 part of sodium nitrite, and 0.4 part of polyvinylpyrrolidone to obtain a dispersion Then add the above dispersion liquid into the reactor with pressure and stirring function, fill it with nitrogen gas and press it to 0.1mpa, control the temperature at 50°C, react for 18 hours and then lower the temperature and pressure to discharge the material, the obtained suspension is centrifuged, dried, sieved, etc. The heat-expandable macromolecular microspheres are obtained through treatment, the outer shell of whi...

Embodiment 2

[0035] (1) Preparation of heat-expandable microspheres

[0036] Adjust the speed of the high-shear disperser to 8000rpm, and make up 25 parts of acrylonitrile, 10 parts of methyl methacrylate, 1 part of ethylene glycol dimethacrylate, 0.8 parts of azobisisobutyronitrile, and 10 parts of n-octane The mixed monomer is dispersed in an aqueous medium consisting of 75 parts of deionized water, 10 parts of silica sol with a solid content of 30wt%, 15 parts of sodium chloride, 0.1 part of sodium nitrite, and 1 part of polyvinylpyrrolidone to obtain a dispersion Then add the above dispersion liquid into the reactor with pressure and stirring function, fill it with nitrogen gas and press it to 1mpa, control the temperature at 80°C, cool down the temperature and reduce the pressure after 20 hours of reaction, and discharge the material, and the obtained suspension is processed by centrifugation, drying, screening, etc. The heat-expandable polymer microspheres are obtained, the shell of ...

example 3

[0046] (1) Preparation of heat-expandable microspheres

[0047] Adjust the speed of the high-shear disperser to 8000rpm, and make up 20 parts of acrylonitrile, 8 parts of methyl methacrylate, 0.5 parts of ethylene glycol dimethacrylate, 0.5 parts of azobisisobutyronitrile, and 8 parts of isopentane The mixed monomer is dispersed in an aqueous medium consisting of 60 parts of deionized water, 8 parts of silica sol with a solid content of 30wt%, 12 parts of sodium chloride, 0.05 part of sodium nitrite, and 0.6 part of polyvinylpyrrolidone to obtain a dispersion ; Then add the above dispersion liquid into the reactor with pressure and stirring, fill it with nitrogen gas and press it to 0.6mpa, control the temperature at 65°C, cool down the temperature and reduce the pressure after reacting for 20h, and discharge the material, and the obtained suspension is processed by centrifugation, drying, sieving, etc. The heat-expandable polymer microspheres are obtained, the shell of which ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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PUM

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Abstract

The invention discloses a preparation method of crease-free superfine fiber synthetic leather based on thermal expansion microspheres. The method is characterized in that the prepared thermal expansion microspheres are dispersed in water-borne polyurethane, fibers of superfine fiber non-woven fabric are filled with the thermal expansion microspheres through dipping, and after solidification and microsphere foaming, the superfine fiber synthetic leather is prepared through decrement and subsequent coating processing. The prepared superfine fiber synthetic leather has good pressing resilience, fullness and softness, base cloth and finished leather are free of creases, and compared with superfine fiber synthetic leather without thermal expansion microspheres, the leather has the advantages that thickness can be increased by 30%-70%, the softness can be increased by 30%-60%, and the water vapor permeability is increased by 100%-150%.

Description

technical field [0001] The invention relates to the field of ultrafine fiber synthetic leather manufacturing, in particular to a method for preparing non-crease ultrafine fiber synthetic leather based on heat-expandable microspheres. Background technique [0002] Microfiber synthetic leather (abbreviated as microfiber leather) is a composite material composed of closely connected superfine fibers and polyurethane. With the characteristics of durability and softness, microfiber synthetic leather has become a substitute for high-grade natural leather, and it is developing rapidly in our country. [0003] However, at present, microfiber synthetic leather, especially microfiber leather based on water-based polyurethane, is difficult to achieve the resilience and fullness of real leather. Creases are prone to appear from the impregnated base fabric to the finished leather after finishing, and sometimes the creases are deep. And wide, and can not self-recovery, greatly affect the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/00D06N3/14
CPCD06N3/0004D06N3/0011D06N3/0043D06N3/0068D06N3/14D06N2201/10D06N2205/08D06N2209/126D06N2211/28
Inventor 范浩军黄国栋颜俊林智贤林建勋向均陈意罗志清刘爱明
Owner SICHUAN UNIV
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