Combustion inhibitor and preparing method and flame-proof acrylic fibre using the same

Abstract

The invention relates to a flame retardant, a preparation method and purposes thereof. The flame retardant is called O-alkyl acrylamide dialkyl thiophosphate. The preparation method is that: 1mol new distilled N- hydroxyalkyl acrylamide is dissolved in 500ml dry aether and poured into a 1000ml four-neck reaction flask with a constant pressure funnel, a refluxing condensing tube and a magnetic stirrer, and 1.05mol distilled triethylamine is added, and the reaction temperature is kept at 0-50 DEG C, then 1mol distilled sulfur dialkyl phosphoryl chloride is dripped into the reaction flask through the constant pressure funnel and the time of dripping is controlled for 1-6h; reaction is kept for 10-48 hours under room temperature, then the reaction is stopped and filtration is made to take out triethylamine hydrochloride, the filtrate is washed with 5 percent sodium hydroxide solution, then is washed with distilled water, and distillation is carried out to remove the aether and water, finally drying is carried out with anhydrous magnesium sulfate so as to obtain the O-alkyl acrylamide dialkyl thiophosphate. The flame retardant of the invention is particularly applicable to be used as a comonomer to prepare flame retardant Orlon.

Description

technical field [0001] The present invention relates to a kind of flame retardant and its preparation method technology, especially a kind of technology of using the flame retardant to prepare non-additive flame retardant acrylic fiber. The international patent main classification number is proposed to be Int.Cl.C08L 101 / 00 2006.01). Background technique [0002] At present, many foreign industries and fields have quite strict flame-retardant requirements for fiber fabrics, such as interiors, carpets, curtains, wall coverings, etc. Protective clothing used in industries such as baby clothes, clothing for the elderly, bed sheets for hospital beds, and firefighting clothing must also be made of flame-retardant fiber materials. Although the current domestic industry standards, laws and regulations in this area are not yet perfect, with the development of the national economy and the continuous improvement of people's living standards, people will gradually realize the necessit...

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Problems solved by technology

However, the copolymerization method has the following defects: it is necessary to change the original polymerization and spinning production process of conventional acrylic fiber spinning; when using inorganic solvent spinning, the content of flame retardant monomer in the polyacrylonitrile copolymer is generally required to be ≤25wt %, and such a content is difficult to meet the requirements of flame retardancy, such as the copolymer of vinyl chloride or vinylidene chloride and acrylonitrile requires the content of vinyl chloride or vinylidene chloride to be above 40wt%; when organic solvent is used as spinning solvent, although it can Increase the content of the flame retardant comonomer to more than 40wt%, but it causes the decline of the heat resistance, weather resistance, dyeability and dimensional stability of the copolymer, which affects the use effect and popularization and application

This kind of flame-retardant acrylic fiber requires the content of vinyl halide copolymerized flame-retardant monomer to be as high as 40% or higher. Although this kind of fiber has a good flame-retardant effect, due to the high content of vinyl halide copolymerized flame-retardant To affect other properties of acrylic fiber, and this kind of fiber has a large amount of smoke when it is burned, and it will release toxic hydrogen halide gas during the burning process to pollute the environment, and its application prospects are restricted.

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