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Preparation method of flame-retardant microfiber leather base cloth based on flame-retardant water-based polyurethane

A water-based polyurethane and microfiber leather technology, applied in textiles and papermaking, can solve the problems of easy migration and precipitation of small molecule flame retardants, and achieve the effect of reducing VOCs emissions and good flame retardant performance

Active Publication Date: 2021-04-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flame retardant chain extender is grafted to the macromolecular chain through chemical bonding, which overcomes the disadvantages of easy migration of small molecule flame retardants (melamine, etc.) and easy precipitation during the reduction process in ordinary intumescent flame retardant systems

Method used

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  • Preparation method of flame-retardant microfiber leather base cloth based on flame-retardant water-based polyurethane
  • Preparation method of flame-retardant microfiber leather base cloth based on flame-retardant water-based polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of flame retardant chain extender: Dissolve 36.9g of cyanuric chloride in acetone, add 33.6g of sodium bicarbonate, then drop 12.8g of methanol, react at 20°C for 4h, and wash the obtained product , filtered, and dried; the obtained product was added to acetonitrile together with 2-amino-2methyl-1,3 propanediol, 27.9g of triethylamine was added, and reacted at 82°C for 6h, then the product was washed and filtered , and dried to obtain (4,6-dimethoxy-1,3,5-triazine)-2-methylpropane-1,3-diol.

[0024] (2) Preparation of flame-retardant water-based polyurethane: Add 60 parts of polytetrahydrofuran diol, 30 parts of 4,4'-diphenylmethane diisocyanate, and 0.01 part of bismuth laurate into the reaction vessel, and keep stirring under the protection of nitrogen atmosphere , raised the temperature to 75°C for 2 hours to prepare a prepolymer; then added 4 parts of dimethylol propionic acid and N,N - 5 parts of dimethylformamide, and maintained at 75 ° C for 2 h...

Embodiment 2

[0028] (1) Preparation of flame retardant chain extender: Dissolve 36.9g of cyanuric chloride in acetone, add 33.6g of sodium bicarbonate, then dropwise add 12.8g of methanol, react at 20°C for 4h, wash the prepared product, Filter and dry; add the obtained product together with 2-amino-2methyl-1,3 propanediol into acetonitrile, add 27.9g of triethylamine, react at 82°C for 6h, then wash the product, filter, After drying, (4,6-dimethoxy-1,3,5-triazine)-2-methylpropane-1,3-diol is obtained.

[0029] (2) Preparation of flame-retardant water-based polyurethane: Add 80 parts of polypropylene glycol, 40 parts of hexamethylene diisocyanate, and 0.01 part of bismuth laurate into the reaction vessel, and raise the temperature to 80 °C for 2.5 hour to obtain prepolymer; then add 6 parts of dimethylol butyric acid and N,N - 7.5 parts of dimethylformamide, and maintained at 80 ° C for 2.5 hours; then 25 parts of flame retardant chain extender and N,N - Add 15 parts of dimethylformami...

Embodiment 3

[0033] (1) Preparation of flame retardant chain extender: Dissolve 36.9g of cyanuric chloride in acetone, add 33.6g of sodium bicarbonate, then drop 12.8g of methanol, react at 20°C for 4h, and wash the obtained product , filtered, and dried; the obtained product was added to acetonitrile together with 2-amino-2methyl-1,3 propanediol, 27.9g of triethylamine was added, and reacted at 82°C for 6h, then the product was washed and filtered , and dried to obtain (4,6-dimethoxy-1,3,5-triazine)-2-methylpropane-1,3-diol.

[0034] (2) Preparation of flame-retardant water-based polyurethane: add 100 parts of polyethylene glycol, 50 parts of isophorone diisocyanate, and 0.01 part of bismuth laurate into the reaction vessel, and heat up to 85 °C under continuous stirring and nitrogen atmosphere protection React 3 hours and make prepolymer; Then add 8 parts of 2-[(2-aminoethyl) amino] ethanesulfonic acid sodium salts in the prepolymer of gained and N,N - 10 parts of dimethylformamide, an...

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Abstract

The invention discloses a preparation method of flame-retardant microfiber leather base cloth based on flame-retardant water-based polyurethane. The preparation method is characterized by comprising the following steps: synthesizing a triazinyl-containing reactive flame-retardant chain extender, introducing the chain extender into a water-based polyurethane side chain by utilizing a chemical reaction to prepare the flame-retardant water-based polyurethane, compounding the prepared flame-retardant water-based polyurethane with ammonium polyphosphate to form an intumescent flame-retardant impregnated slurry impregnated sea island type superfine fiber (microfiber for short) non-woven fabric, placing the microfiber non-woven fabric soaked with the slurry in solidification liquid to be solidified, then sea components are removed through a decrement process, and obtaining the microfiber synthetic leather base cloth with the 3D flame-retardant function through washing, drying and after-treatment. The flame-retardant water-based polyurethane composite slurry is adopted to replace the traditional solvent type polyurethane impregnation slurry, so that the flame retardancy of the base cloth is improved, VOCs pollution is eliminated from the source, and the quality, ecological grade and international market competitiveness of the synthetic leather are greatly improved. (The structural formula of the flame-retardant chain extender).

Description

technical field [0001] The invention specifically relates to a method for preparing a flame-retardant superfiber leather base cloth based on flame-retardant water-based polyurethane, which belongs to the field of functional synthetic leather manufacturing. Background technique [0002] Microfiber synthetic leather is a composite material developed based on dissolved island-in-the-sea superfine fibers, which are composed of superfine fibers and polyurethane. Microfibers are bundled, and their fineness and structure are similar to collagen fibers. The microfibers are three-dimensionally intertwined in the superfine fiber synthetic leather, which acts as a support for the skeleton; the polyurethane distributed around the fibers makes the entire synthetic leather base fabric form an organic whole, which not only has filling properties in the base fabric , And form a circular, fingerprint-shaped or honeycomb cell structure, these cell structures are interlaced and connected, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/00D06N3/14C08G18/66C08G18/48C08G18/34C08G18/32C08G18/10
CPCD06N3/148D06N3/146D06N3/0011D06N3/0004D06N3/0059C08G18/6692C08G18/6685C08G18/4854C08G18/48C08G18/4833C08G18/10D06N2211/28D06N2209/067C08G18/348C08G18/3851C08G18/3855
Inventor 范浩军崔梦杰陈意颜俊向均李静
Owner SICHUAN UNIV
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