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Preparation method of flame-retardant cellulose fiber

A technology of flame-retardant cellulose and cellulose pulp, which is applied in the manufacture of fire-resistant and flame-retardant filaments, single-component cellulose rayon, and fiber chemical characteristics. It can solve the problem of interfering with the orientation and arrangement of cellulose molecules and affecting the Problems such as mechanical strength and high loss of flame retardant, achieve high microcapsule doping rate, reduce loss and ensure fiber strength

Pending Publication Date: 2021-08-31
湖北金环绿色纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lenzing Company and Donghua University mentioned that it is difficult to purify and recover N-methylmorpholine oxide by using flame retardant aqueous solution or dissolving flame retardant in N-methylmorpholine oxide aqueous solution. Moreover, the loss of flame retardants during washing is relatively high; adding the flame retardants to the spinning dope in a finely ground powder state is also insufficient. First of all, some types of flame retardants such as aluminum hypophosphite, ammonium polyphosphate, etc. Slightly soluble, the loss of flame retardants exists, and secondly, basically all inorganic flame retardants have poor compatibility with polymer materials. Shedding loss, more seriously, the flame retardant particles interfere with the orientation and arrangement of cellulose molecules, significantly affecting the mechanical strength of the fiber

Method used

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  • Preparation method of flame-retardant cellulose fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 180Kg of N-methylmorpholine oxide solvent (water content 50%) into 1m 3 Turn on the mixer in the dissolution tank and stir at a speed of 200r / s, add 3.53Kg microcapsule powder during stirring, wherein the wall material of the microcapsule is melamine resin, the core material of the microcapsule is ammonium polyphosphate, and the ammonium polyphosphate is in the microcapsule The mass fraction of the microcapsules is 92%, and the average particle size of the microcapsules is 4.8um. After stirring for 5 minutes, add 11.5Kg of wood pulp with a polymerization degree of 1078 (moisture content: 8.6%), keep stirring the mixture at a speed of 60r / s and gradually raise the temperature to 75°C, so that the mixture becomes a uniform and viscous pulp porridge .

[0017] The reaction kettle is connected with a vacuum pump and a distillation condenser, and the pressure in the kettle is maintained at 5×10 3 Pa, start stirring and start heating at the same time, make the temperatu...

Embodiment 2

[0020] Put 6Kg of N-methylmorpholine oxide solvent (with a water content of 55%) into a 10L dissolution kettle, start the mixer and stir at a speed of 80r / s, and add 0.125Kg of microcapsule powder during the stirring, wherein the wall material of the microcapsules is Melamine resin, the core material of microcapsules is aluminum hydroxide. The mass fraction of aluminum hydroxide in the microcapsules is 86%, and the average particle size of the microcapsules is 0.8um. After stirring for 5 minutes, add 0.292Kg cotton pulp with a degree of polymerization of 762 (water content 9.7%), keep stirring the mixture at a speed of 60r / s and gradually raise the temperature to 75°C, so that the mixture becomes a uniform and viscous pulp porridge .

[0021] The reaction kettle was connected with a vacuum pump and a distillation condenser, and the pressure in the kettle was maintained at 3×10 3 Pa, start stirring and start heating at the same time, make the temperature in the kettle rise to...

Embodiment 3

[0024] Put 30Kg of N-methylmorpholine oxide solvent (with a water content of 55%) into a 50L dissolution tank, start the mixer and stir at a speed of 80r / s, add 0.64Kg of microcapsule powder during the stirring, and the wall material of the microcapsules is Melamine resin, the core material of microcapsules is red phosphorus. The mass fraction of aluminum hydroxide in the microcapsules is 89%, and the average particle size of the microcapsules is 3.1um. After stirring for 5 minutes, add 1.52Kg cotton pulp with a degree of polymerization of 762 (water content 9.5%), keep stirring the mixture at a speed of 60r / s and gradually raise the temperature to 75°C, so that the mixture becomes a uniform and viscous pulp porridge .

[0025] The reaction kettle was connected with a vacuum pump and a distillation condenser, and the pressure in the kettle was maintained at 3.6×10 3 Pa, start stirring and start heating at the same time, make the temperature in the kettle rise to 103° C. with...

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Abstract

The invention belongs to the field of cellulose materials, and relates to a preparation method of flame-retardant cellulose fiber. The specific method comprises the following steps of uniformly mixing a flame retardant microcapsule wrapped by melamine resin with an aqueous solution of N-methylmorpholine oxide, heating and dissolving cellulose under reduced pressure, and finally carrying out spinning to obtain the fiber uniformly doped with the flame retardant microcapsule. The production process is short, the production process is environment-friendly, and continuous and stable production can be realized. The produced fiber is high in strength, soft in hand feeling, uniform in embedded microcapsule dispersion, washable and excellent in flame retardant property.

Description

technical field [0001] The invention relates to the technical field of cellulose materials, in particular to a method for preparing flame-retardant cellulose fibers. Background technique [0002] Regenerated cellulose fiber has a wide range of raw materials, is naturally skin-friendly and degradable, and is an environmentally friendly "green" fiber with excellent performance. Regenerated cellulose fiber belongs to carbohydrates, and its flammability makes it a hidden danger of initiating and expanding fires. Therefore, research on cellulose fibers with flame retardant properties has received extensive attention. [0003] Auxiliaries or reactants can be added in many links in the production of regenerated cellulose fibers, so there are various ways to add flame retardants to fibers, which can be roughly divided into copolymerization method, blending method, simple impregnation method, impregnation method, etc. Roll-baking method, coating method, etc. [0004] According to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/00D01F1/07
CPCD01F2/00D01F1/07
Inventor 姜俊全余达山陈文波胡宏伟
Owner 湖北金环绿色纤维有限公司
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