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Modified polyacrylonitrile fiber (fabric) with flame retardant or noncombustible performance and a preparation method thereof

A technology of modified fiber and polyacrylonitrile, applied in the direction of fiber type, fiber treatment, textile and papermaking, etc., can solve the problems of easy combustion, limited use range, easy to generate static electricity, etc., and achieve high flame resistance.

Inactive Publication Date: 2009-08-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, acrylic fibers or fabrics have two major disadvantages: one is extremely flammable; the other is that it is easy to generate static electricity, which greatly limits its scope of use.
The above flame retardant acrylic fibers are based on halides and Sb 2 o 3 It is made of gas phase flame retardant, and its disadvantage is that it will release HCl and BaCl when burning. 2 , HCN and other toxic gases can not reach the performance of flame resistance or non-combustibility

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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  • Modified polyacrylonitrile fiber (fabric) with flame retardant or noncombustible performance and a preparation method thereof
  • Modified polyacrylonitrile fiber (fabric) with flame retardant or noncombustible performance and a preparation method thereof
  • Modified polyacrylonitrile fiber (fabric) with flame retardant or noncombustible performance and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Use 15-28% hydrazine hydrate as a catalyst, add it to the reactor, heat it to 90°C, add soap to wash the oil-free acrylic fiber with a bath ratio of 1:15-25; keep the temperature in the range of 95-100°C. After stirring for 38-45 minutes, take it out, wash it with water, and dry it. Add zinc sulfate solution to the above-mentioned modified fiber at a bath ratio of 1:15-25, heat to 95-100°C, and process for 38-45 minutes under stirring, and keep the pH value at 1-5 during the reaction acidic range. That is, the flame-resistant fiber whose color is light purple is obtained. The LoI value of this flame-resistant fiber is 35. And it fully complies with ASTM D 1230 of the United States, BS 5722 of the United Kingdom (Western Europe), JIS L1091 of Japan, and GB / T17591-2006 and GB / T5455-1997 of China. When burning, after the fire source is removed (ignited), the flame-resistant fabric will not continue to burn or smolder. After the combustion is terminated or the fire sourc...

Embodiment 2

[0038] Before the flame-resistant process, wash the fabric or fiber to be treated with washing powder to remove the oil on the fabric or fiber, and then use 20-30% amine aqueous solution to catalyze the cyclization of acrylic fiber at 80-95 ° C, then wash with water, drying to obtain partially cyclized fiber (I); then hydrolyzing the fiber (I) with 10-25% NaOH aqueous solution, washing with water, and drying to obtain fiber (II); then neutralizing the alkali with 10-25% HCl aqueous solution and Further hydrolysis, washing and drying to obtain fiber (III); and then treating with calcium (Ca) salt solution to bond or chelate with fiber (III), washing and drying to obtain fiber (IV). Drying is carried out after each step of the above treatment, so that the samples of each step of treatment must be analyzed and tested. However, in actual mass production, it is not necessary to dry each product obtained. It is only necessary to wash the treatment solution of the previous step on th...

example 3

[0043] The acrylic fibers or fabrics of ternary copolymerization are used as samples, and the original acrylic samples are washed with washing powder or detergent to remove the original fibers obtained from the oil agent on the surface of the original samples (I # ). Treat the fibrils with 18-25% amine aqueous solution and add oxygen at 85-98°C for 30 minutes to make them cyclized, then wash with water and dry to obtain the modified fiber (II # ). Neutralize the alkali with 10-25% hydrochloric acid aqueous solution, and further hydrolyze, make flame-resistant fiber (III # ). Then treat modified fiber II with copper salt solution (25% aqueous solution) at 80-90°C # 30min, cleaning, drying, made non-combustible fiber (IV # ). In continuous and large-scale production, the above two-step treatment does not need to be dried. The properties of modified acrylic fibers or fabrics after the above steps are shown in Table 2

[0044] Table 2, performance indicators after each step...

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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Abstract

The invention relates to a modified polyacrylonitrile fibre with flame retardant or noncombustible performance and a preparation method thereof. The fiber is characterized in that: each 100kg fabric comprises the ingredients with the following contents: 0.75kg-14kg hydrazine hydrate, 2 kg-3kg sodium hydroxide, 3kg-5kg hydrochloric acid, 9kg-15kg organic amine, 0.5kg-1.50kg zinc sulfate or calcium carbonate, 0.7kg-1.50kg calcium chloride and 0.8kg-1.50kg copper sulfate. The preparation method comprises the following steps: firstly using amine aqueous solution with concentration of 18%-30% or hydrazine hydrate with concentration of 15%-28% for the fiber or fabric, then adding the deoiled fiber or fabric into the catalyst hydrazine hydrate at the temperature of 80 DEG C-100 DEG C by a bath ratio 1:15-25; keeping the temperature at 95 DEG C-100 DEG C and stirring the mixture for 38 minutes-45 minutes to obtain the modified fiber; adding the processed modified fiber into calcium salt solution or cupric salt solution or zinc sulfate solution while the bath ratio is 1:15-25, then processing the mixture for 30 minutes-60 minutes at the temperature of 80 DEG C-100 DEG C to ensure the water content of the fiber or fabric to reach about 28% of bound water and about 25% of chelated water and ensure the metal atom to be complex with cyano-group; washing and drying. The method improves the two shortcomings of the original PAN fiber or fabric, such as easy combustion and easy generation of static under the condition of friction.

Description

technical field [0001] The invention belongs to the field of polyacrylonitrile modified fiber and its preparation, in particular to a flame-resistant or non-combustible polyacrylonitrile modified fiber (fabric) and a preparation method thereof. Background technique [0002] Polyacrylonitrile (acrylic fiber) fibers or fabrics can be dyed with cationic dyes into bright colors, excellent wear resistance, good warmth retention (artificial wool), unique feel and excellent softness, etc., and have become an important synthetic material at present. One of the fibers, and widely used in daily life and industrial production. But acrylic fibers or fabrics have two major disadvantages: one is extremely flammable; the other is that it is easy to generate static electricity, which greatly limits its scope of use. [0003] In the 1950s, Houtz found that PAN fibers or fabrics were heated to a certain temperature, and under the action of a catalyst, they would be cyclized into ladder-shape...

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): D06M11/38D06M13/325D06M11/63D06M101/28
Inventor 赵择卿马艳玲秦文范陈杰陈小立
Owner DONGHUA UNIV
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