Preparation method of halogen-free flame retardant high-intensity polyvinyl alcohol fibers

A polyvinyl alcohol fiber and polyvinyl alcohol technology, which is applied in the manufacture of fire-retardant and flame-retardant filaments, chemical characteristics of fibers, preparation of spinning solutions, etc. Excellent properties, high fiber strength and high carbon formation rate

Active Publication Date: 2011-04-06
SICHUAN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the flame-retardant polyvinyl alcohol fibers prepared by the above methods, although they all have certain flame retardancy, most of them contain a large amount of halog

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 50kg of bis-neopentyl glycol dithiopyrophosphate flame retardant with an average particle size of 0.8 μm, 6.2kg of fatty alcohol polyoxyethylene ether phosphate, and 92kg of water were mixed and ground to form a flame retardant slurry; the degree of polymerization was 1700, 150kg of polyvinyl alcohol with a degree of alcoholysis greater than 99%, 1kg of boric acid, 1.5kg of acetic acid, and 680kg of water are dissolved at a temperature of 98°C to become a spinning stock solution. The flame retardant slurry and polyvinyl alcohol solution are continuously mixed by injection mixing before spinning, and the mixed spinning stock solution is sprayed into the coagulation bath through the spinneret hole with a specification of 0.07*24000. The coagulation bath has a specific gravity of 1.29g / ml, a mixed aqueous solution of sodium sulfate and sodium hydroxide with an alkalinity of 32g / L and a temperature of 44°C. The solidified filaments are neutralized in a mixed aqueous soluti...

Embodiment 2

[0033]38kg of chlorinated pentaerythritol spirocyclic phosphate-resorcinol copolymer flame retardant with an average particle diameter of 0.8 μm, 3.5kg of sorbitan monooleate, 2kg of castor oil polyoxyethylene ether, and 72kg of water were mixed and ground Disperse into a flame retardant slurry; dissolve 150kg of polyvinyl alcohol with a degree of polymerization of 2000 and an alcoholysis degree greater than 99%, 0.9kg of boric acid, 1.6kg of acetic acid, and 730kg of water at a temperature of 98°C to form a spinning stock solution. The flame retardant slurry and polyvinyl alcohol solution are continuously mixed by injection mixing before spinning, and the mixed spinning stock solution is sprayed into the coagulation bath through the spinneret hole with a specification of 0.08*24000. The coagulation bath has a specific gravity of 1.29g / ml, a mixed aqueous solution of sodium sulfate and sodium hydroxide with an alkalinity of 30g / L and a temperature of 44°C. The solidified fila...

Embodiment 3

[0035] 45kg of pentaerythritol diphosphate melamine salt with an average particle size of 0.8 μm, 8.3kg of sodium dodecylbenzenesulfonate, and 89kg of water were mixed and ground to form a flame retardant slurry; 150kg of 99% polyvinyl alcohol, 1kg of boric acid, 1.5kg of acetic acid, and 680kg of water are dissolved at a temperature of 98°C to form a spinning stock solution. The flame retardant slurry and polyvinyl alcohol solution are continuously mixed by injection mixing before spinning, and the mixed spinning stock solution is sprayed into the coagulation bath through the spinneret hole with a specification of 0.07*24000. The coagulation bath has a specific gravity of 1.29g / ml, a mixed aqueous solution of sodium sulfate and sodium hydroxide with an alkalinity of 30g / L and a temperature of 44°C. The solidified filaments are neutralized in a mixed aqueous solution of sodium sulfate and sulfuric acid with a specific gravity of 1.29g / ml, an acidity of 12g / L, and a temperatur...

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Abstract

The invention discloses a preparation method of halogen-free flame retardant high-intensity polyvinyl alcohol fibers, which is characterized by comprising the following steps of uniformly mixing 20-45 parts by weight of phosphate ester flame retardant powder with the average particle size no more than 1.0 microns, 1-10 parts by weight of dispersing agent, and 40-79 parts by weight of water to prepare flame retardant suspended slurry, continuously mixing the slurry and polyvinyl alcohol plus boron spinning solution with the polymerization degree of 1700-3000 and the alcoholysis degree more than 99 percent through a mode of spun injection, carrying out spinning with the mixed solution through a polyvinyl alcohol wet method plus a spinning process route, carrying out neutralization, wet-heat drawing, washing and drying on solidified fibers to obtain as-spun fibers, preheating the as-spun fibers to the temperature of 200-230 DEG C, drawing by 2-4 times, and then carrying out heat setting on the fibers at the temperature of 180-210 DEG C for 2-5min to obtain the halogen-free flame retardant high-intensity polyvinyl alcohol fibers. According to different uses, post-treatment steps such as formalization, oiling, curling, cutting and the like can be selectively carried out on the flame-retardant fibers. The flame-retardant fibers prepared through the method has the advantages of low toxicity and high intensity, realizes self-extinguishment after leaving fire, is free of halogen and the dripping phenomenon and is used for aspects of fabric flame retarding, enhancing flame retardant fabrics and the like, and the limited oxygen index can reach 28-30.

Description

technical field [0001] The invention relates to a preparation method of a halogen-free flame-retardant high-strength polyvinyl alcohol fiber. The invention belongs to the field of preparation of high-performance flame-retardant fibers. Background technique [0002] As flame-retardant fibers, the following types are well known at present: 1. Polyacrylonitrile fibers and polyester fibers prepared by copolymerization and spinning of flame-retardant monomers; 2. Fibers prepared from aromatic heat-resistant polymers, such as aromatic Polyamide, aromatic polyester, polyimide, polyarylene oxadiazole, polyphenylene sulfide, polyetheretherketone fiber, etc.; 3. Thermosetting fibers, typically melamine fibers and phenolic fibers; 4. Resistance Flame retardant added flame retardant fibers, such as flame retardant viscose fiber, flame retardant vinylon, flame retardant polypropylene, etc. Among these flame-retardant fibers, polyacrylonitrile flame-retardant fibers will release hydroge...

Claims

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Application Information

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IPC IPC(8): D01F6/50D01F1/07D01D1/02D01D5/06D01D5/14
Inventor 徐建军施楣梧刘三民姜猛进叶光斗张志勤唐诗俊付兴伟韦啸
Owner SICHUAN UNIV
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