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Method for increasing fire resistance of meta-aromatic polyamide polymer

A technology for aromatic polyamides and polymers, which is applied in the field of improving the flame retardancy of aromatic polyamide polymers, and can solve problems such as unfavorable environmental protection and production safety protection, weakening flame retardant effect of flame retardants, and decrease in fiber strength. Achieve the effects of environmental protection and production safety protection, increase glass transition temperature, and improve flame retardancy

Inactive Publication Date: 2005-10-19
邢哲
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, because these treatment methods destroy the surface structure of the fiber, the strength of the fiber will decrease and the unevenness will increase: the subsequent products will lose part of the flame retardant after repeated washing or rainwater, which will weaken the flame retardant. Flame retardant effect: at the same time, because the substances used are often highly corrosive, the operating environment of the process of adding flame retardants and subsequent processing will be relatively harsh, which is not conducive to environmental protection and production safety protection

Method used

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  • Method for increasing fire resistance of meta-aromatic polyamide polymer
  • Method for increasing fire resistance of meta-aromatic polyamide polymer

Examples

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example 1

[0015] Dissolve 3.16 kg of m-phenylenediamine and 0.50 kg of 3,3'-diaminodiphenylsulfone in 37.00 kg of dimethylacetamide to form a 9% solution, cool to 0°C, and add in 7 times 6.50 kg of isophthaloyl chloride was subjected to polycondensation reaction under the protection of nitrogen, while controlling the reaction temperature between 0-20°C, and when the apparent viscosity of the solution reached 287Pa·S, the reaction was terminated, and the obtained meta-aromatic The oxygen index of the polyamide polymer is 30, and the glass transition temperature is 247°C.

example 2

[0017] Dissolve 3.10 kg of m-phenylenediamine and 0.6 kg of 3,3'-diaminodiphenylsulfone in 27.13 kg of dimethylacetamide to form a 12% solution, cool to 0°C, and add in 7 times 6.21 kg of isophthaloyl chloride was subjected to polycondensation reaction under the protection of nitrogen, and the reaction temperature was controlled between 0-20°C. When the apparent viscosity of the solution reached 259Pa·S, the reaction was terminated, and the obtained meta-aromatic The oxygen index of the polyamide polymer is 31, and the glass transition temperature is 247°C.

example 3

[0019] Dissolve 2.71 kg of m-phenylenediamine and 1.20 kg of 3,3'-diaminodiphenyl sulfone in 35.20 kg of dimethylacetamide to form a 10% solution, cool to 0°C, and add in 8 times 6.05 kg of isophthaloyl chloride was subjected to polycondensation reaction under the protection of nitrogen, and the reaction temperature was controlled between 0-40°C. When the apparent viscosity of the solution reached 253Pa·S, the reaction was terminated, and the obtained meta-aromatic The oxygen index of the polyamide polymer is 34, and the glass transition temperature is 240°C.

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Abstract

The preparation process of aromatic mata-polyamide with raised fire resistance includes mixing m-phenylene-diamine and R, R'-dismino diphenylsulfone and dissolveing in solvent to compound solution in certain concentration, cooling to -10 deg.c to 0 deg.c, adding m-phenyldimethyl acyl chloride to produce condensation while controlling the reaction temperature in 0-40 deg.c until the solution reaches the target apparent viscosity to obtain aromatic mata-polyamide with raised fire resistance. The present invention has raised production efficiency, lowered production cost, raised vitrification point and raised strength and module of subsequent product.

Description

technical field [0001] The invention relates to a method for improving the flame retardancy of aromatic polyamide polymers, in particular to a method for improving the flame retardancy of meta-position aromatic polyamide polymers. Background technique [0002] Meta-aromatic polyamide polymer is one of the best high-temperature-resistant textile materials in the world today. It has excellent high-temperature resistance, and only emits a small amount of harmful gas during carbonization without producing molten droplets. The current meta-aromatic polyamide polymer is mainly synthesized by condensation of m-phenylenediamine and isophthaloyl chloride. However, the oxygen index or LOI value of the polymer synthesized using this formulation is generally 26-28, and the oxygen index of the spun fiber is the same as that of the polymer. Although it is higher than cotton fiber and nylon fiber, it is obviously lower than other high-performance materials such as PBI with LOI value above...

Claims

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Application Information

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IPC IPC(8): C08G69/42
Inventor 邢哲郭润栋李吉东
Owner 邢哲
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