Method for preparing melamine formaldehyde resin/polyvinyl alcohol flame-proof fiber

A technology of melamine and formaldehyde resin, which is applied in the manufacture of fire-retardant and flame-retardant filaments, short fiber formation, and conjugated synthetic polymer man-made filaments, etc., can solve the problems of low production efficiency and achieve high production efficiency and good flame-retardant performance. , The effect of not reducing the flame retardant performance

Inactive Publication Date: 2009-07-22
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patents on melamine-formaldehyde fibers include European patents EP 93965-A and EP 221330-A. These two patents directly spin the resin obtained by condensation of modified melamine and formaldehyde to obtain flame-retardant fibers. These two methods There is no need to add fiber-forming agents, and the spinning method used is also "dry reaction spinning method" or "centrifugal spinning method", which also has the problem of low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Melamine 80g, 87.6g of 37wt% formaldehyde aqueous solution (melamine and formaldehyde molar ratio is 1: 1.7) are added in the reactor with thermometer, stirrer and reflux condenser, adjust pH=8~9 with sodium hydroxide, in The temperature was 90° C. for 5 hours to obtain a colorless transparent viscous liquid with a resin solid content of 51 wt%. Mix 330g of 20wt% polyvinyl alcohol (polymerization degree 1700, alcoholysis degree 99%) with the above-mentioned melamine formaldehyde resin solution at a temperature of 75°C, adjust the pH to 8-9 with sodium hydroxide, and filter under pressure at a temperature of 60°C , defoaming, transported to the spinneret hole with a diameter of 0.08mm by a metering pump, and the stock solution is sprayed into a saturated sodium sulfate aqueous solution with a temperature of 50°C and pH=3 in a thin stream through the spinneret hole to solidify and form, and the as-spun fiber is stretched 3 times Send it to a steam oven with a temperature ...

Embodiment 2

[0030] Add 80 g of melamine and 206 g of 37 wt % formaldehyde solution (the molar ratio of melamine to formaldehyde is 1:4) into a reactor equipped with a thermometer, a stirrer and a reflux condenser, adjust the pH to 8-9 with sodium carbonate, and set the temperature at 50 °C for 2 hours to obtain a colorless transparent viscous liquid with a resin solid content of 35 wt%. Mix 400g of 25wt% polyvinyl alcohol (polymerization degree 2000, alcoholysis degree 99%) with the above-mentioned melamine-formaldehyde resin solution at a temperature of 60°C, adjust pH=8 to 9 with sodium carbonate, pressurize and filter at a temperature of 40°C, and remove Bubble, transported to the spinneret hole with a diameter of 0.1mm by a metering pump, the stock solution is sprayed into a saturated sodium sulfate aqueous solution with pH=4 at 45°C in a thin stream through the spinneret hole to solidify and form, and the as-spun fiber is stretched 5 times and sent to the temperature Wet heat treatme...

Embodiment 3

[0032] Add 80 g of melamine and 77.2 g of 37 wt % formaldehyde solution (the molar ratio of melamine to formaldehyde is 1:1.5) into a reactor with a thermometer, a stirrer and a reflux condenser, adjust the pH=9 to 10 with triethanolamine, and React at 100°C for 5 hours to obtain a colorless transparent viscous liquid with a resin solid content of 52 wt%. Mix 330g of 20wt% polyvinyl alcohol (polymerization degree 1700, alcoholysis degree 97%) with the above-mentioned melamine-formaldehyde resin solution at a temperature of 95°C, adjust the pH to 8-9 with sodium hydroxide, and filter under pressure at a temperature of 80°C , defoaming, transported to the spinneret hole with a diameter of 0.08mm by a metering pump, the stock solution is sprayed into a saturated sodium sulfate aqueous solution with a temperature of 48°C and pH=3 through the spinneret hole in a thin stream, and solidified, and the as-spun fiber is stretched 4 times Send it to a steam oven with a temperature of 90°...

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Abstract

The invention discloses a manufacturing method of melamine-formaldehyde resin / polyvinyl alcohol flame-retardant fiber, which is characterized in that melamine-formaldehyde resin is synthesized at a temperature of 50-100° C. in an aqueous solution of melamine-formaldehyde resin at a molar ratio of 1:1.2 to 1:6. , mixed with polyvinyl alcohol aqueous solution according to the solid content ratio of 2:8 to 8:2 to obtain spinning stock solution, which is formed by conventional wet spinning, and the coagulation bath adopts acidic saturated sodium sulfate aqueous solution. The melamine-formaldehyde resin / polyvinyl alcohol flame-retardant fiber is obtained after the as-spun fiber is stretched, damp-heat-set, washed, crimped, oiled, dried, and dry-heat-set. The fineness of the flame-retardant fiber is 3-10dtex, the strength is 1-3cN / dtex, the elongation at break is 5%-15%, the moisture regain is 5-10%, and the limiting oxygen index is 30-45.

Description

technical field [0001] The invention relates to a method for manufacturing melamine-formaldehyde resin / polyvinyl alcohol flame-retardant fibers. It belongs to the field of flame-retardant fiber manufacture. Background technique [0002] At present, there are three flame retardant technical solutions for fibers: a. flame retardant blend spinning method, this method is to mix 5% to 40% flame retardant into the polymer by melting body or solution spinning method to obtain flame retardant fibers; b. flame retardant monomer copolymerization method, this method is to copolymerize the polymerizable monomer containing flame retardant elements with the main monomer to obtain a polymer with flame retardant properties, and then The polymer is spun to obtain a flame-retardant fiber; c. After-finishing method, this method is a method of attaching a flame retardant to the surface of the fiber by coating or cross-linking to obtain a flame-retardant fiber. The flame retardant blending met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F1/07D01F8/16D01F8/10D01D1/02D01D5/06D01D5/26
Inventor 徐建军施楣梧姜猛进叶光斗李守群杨智渊卢奎林
Owner SICHUAN UNIV
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