Anionic polyelectrolyte, post-finishing flame retardant method of nylon fabric

Abstract

The invention provides an anionic polyelectrolyte and a post-finishing flame-retardant method for nylon fabrics. The post-finishing flame-retardant method comprises surface modification of the nylon fabric; alternating the surface-modified nylon fabric in the solution of the anionic polyelectrolyte and the Soaking in the cationic polyelectrolyte solution to form a flame-retardant coating to obtain a nylon fabric containing the flame-retardant coating; performing cross-linking treatment on the nylon fabric containing the flame-retardant coating to form a flame-retardant coating. Compared with the prior art, the present invention uses layer-by-layer self-assembly to realize the construction of flame-retardant coating through electrostatic force, and the structure of the introduced polyelectrolyte contains various flame-retardant elements such as phosphorus, nitrogen, sulfur, etc., which can play multiple roles. The synergistic effect between two kinds of flame retardant elements can improve the flame retardant performance of nylon fabric; the durability of nylon fabric flame retardant coating can be improved by cross-linking treatment; the production process of this method is simple, the technical equipment requirements are low, and the treatment conditions are mild , in line with the requirements of green environmental protection.

Description

technical field

[0001] The invention belongs to the technical field of post-finishing flame retardant, and in particular relates to an anionic polyelectrolyte and a post-finishing flame-retardant method for nylon fabrics. Background technique

[0002] Nylon fiber has also become nylon in our country, and it is the earliest industrialized synthetic fiber variety in the world. Compared with other synthetic fibers, nylon fiber has the advantages of high strength, good wear resistance, good elasticity, light weight, corrosion resistance, no fear of moths, and no mold. It occupies a pivotal position in the fields of clothing, home textiles and industrial applications. Widely used, it is the second largest synthetic fiber after polyester fiber. However, nylon fabric is extremely flammable, and its limiting oxygen index (LOI) is between 22% and 24%. Compared with other polymer materials, it has a large specific surface area, so the flame spreads extremely fast when burning. The m...

Examples

preparation example Construction

[0075] The present invention also provides a method for preparing the above-mentioned anionic polyelectrolyte, comprising: combining hypophosphorous acid raw materials with R 1 =O, H-R 2 -H, POM and Cl-R 3 -One or more reactions in Cl to obtain anion polyelectrolyte; the hypophosphorous acid raw material is hypophosphorous acid and / or hypophosphite salt.

[0076] where the R 1 , R 2 with R 3 All are the same as above, and will not be repeated here.

[0077] According to the invention, it is preferred to combine hypophosphorous acid and / or hypophosphite with R 1 =O, H-R 2 -H reaction to obtain anionic polyelectrolyte, or hypophosphorous acid and / or hypophosphite with polyoxymethylene, Cl-R 3 -Cl reaction to obtain anionic polyelectrolyte.

[0078] When hypophosphorous acid and / or hypophosphite with R 1 =O, H-R 2 When -H reacts, its reaction chemical formula is as follows:

[0079]

[0080] When hypophosphorous acid and / or hypophosphite and polyoxymethylene, Cl-R ...

Embodiment 1

[0096] 1.1 Add 70.0g of sodium hypophosphite, 36.0g of paraformaldehyde, 300ml of deionized water and 20ml of hydrochloric acid into the reaction kettle, turn on the mechanical stirring and raise the reaction temperature to 90°C, keep it warm and react for 24h, then obtain a white color by rotary evaporation The solid product is sodium hydroxymethyl hypophosphite.

[0097] 1.2 Add 13g of sodium hydroxymethyl hypophosphite obtained in 1.1, 13g of itaconic acid, 20g of phenylphosphonic dichloride, 20ml of deionized water and 150ml of acetonitrile into the reactor, turn on mechanical stirring and raise the reaction temperature to 80°C , Condensate and reflux to discharge the hydrogen chloride produced in the reaction, keep warm and react for 6h, then obtain the product by rotary evaporation, wash with ether to remove impurities, and dry to obtain a white solid product, which is an anionic polyelectrolyte. The chemical reaction formula is as follows:

[0098]

[0099] Among the...

Embodiment 2

[0102] Add 20.0g of chitosan, 12.0g of phenylphosphonic dichloride, 4.4g of acrylic acid, 10.0g of triethylamine and 300ml of acetonitrile into the reaction kettle, turn on the mechanical stirring and raise the temperature to 60°C, keep warm and react for 12h, then rotate evaporate and wash , filtered, and dried to obtain a yellow solid product, which is modified chitosan.

[0103] Utilize infrared spectrum to analyze chitosan and modified chitosan in embodiment 2, obtain its infrared spectrum figure such as figure 2 Shown, wherein A is modified chitosan, B is chitosan. By comparing the spectra of chitosan and modified chitosan, it can be found that 1631cm -1 and 2972cm -1 The peaks at correspond to the characteristic peaks of the double bond and the methylene connected to it, indicating that acrylic acid has been grafted onto the chitosan structure through phenylphosphonyl dichloride.

technical field

[0001] The invention belongs to the technical field of post-finishing flame retardant, and in particular relates to an anionic polyelectrolyte and a post-finishing flame-retardant method for nylon fabrics. Background technique

[0002] Nylon fiber has also become nylon in our country, and it is the earliest industrialized synthetic fiber variety in the world. Compared with other synthetic fibers, nylon fiber has the advantages of high strength, good wear resistance, good elasticity, light weight, corrosion resistance, no fear of moths, and no mold. It occupies a pivotal position in the fields of clothing, home textiles and industrial applications. Widely used, it is the second largest synthetic fiber after polyester fiber. However, nylon fabric is extremely flammable, and its limiting oxygen index (LOI) is between 22% and 24%. Compared with other polymer materials, it has a large specific surface area, so the flame spreads extremely fast when burning. The m...

Examples

preparation example Construction

[0075] The present invention also provides a method for preparing the above-mentioned anionic polyelectrolyte, comprising: combining hypophosphorous acid raw materials with R 1 =O, H-R 2 -H, POM and Cl-R 3 -One or more reactions in Cl to obtain anion polyelectrolyte; the hypophosphorous acid raw material is hypophosphorous acid and / or hypophosphite salt.

[0076] where the R 1 , R 2 with R 3 All are the same as above, and will not be repeated here.

[0077] According to the invention, it is preferred to combine hypophosphorous acid and / or hypophosphite with R 1 =O, H-R 2 -H reaction to obtain anionic polyelectrolyte, or hypophosphorous acid and / or hypophosphite with polyoxymethylene, Cl-R 3 -Cl reaction to obtain anionic polyelectrolyte.

[0078] When hypophosphorous acid and / or hypophosphite with R 1 =O, H-R 2 When -H reacts, its reaction chemical formula is as follows:

[0079]

[0080] When hypophosphorous acid and / or hypophosphite and polyoxymethylene, Cl-R ...

Embodiment 1

[0096] 1.1 Add 70.0g of sodium hypophosphite, 36.0g of paraformaldehyde, 300ml of deionized water and 20ml of hydrochloric acid into the reaction kettle, turn on the mechanical stirring and raise the reaction temperature to 90°C, keep it warm and react for 24h, then obtain a white color by rotary evaporation The solid product is sodium hydroxymethyl hypophosphite.

[0097] 1.2 Add 13g of sodium hydroxymethyl hypophosphite obtained in 1.1, 13g of itaconic acid, 20g of phenylphosphonic dichloride, 20ml of deionized water and 150ml of acetonitrile into the reactor, turn on mechanical stirring and raise the reaction temperature to 80°C , Condensate and reflux to discharge the hydrogen chloride produced in the reaction, keep warm and react for 6h, then obtain the product by rotary evaporation, wash with ether to remove impurities, and dry to obtain a white solid product, which is an anionic polyelectrolyte. The chemical reaction formula is as follows:

[0098]

[0099] Among the...

Embodiment 2

[0102] Add 20.0g of chitosan, 12.0g of phenylphosphonic dichloride, 4.4g of acrylic acid, 10.0g of triethylamine and 300ml of acetonitrile into the reaction kettle, turn on the mechanical stirring and raise the temperature to 60°C, keep warm and react for 12h, then rotate evaporate and wash , filtered, and dried to obtain a yellow solid product, which is modified chitosan.

[0103] Utilize infrared spectrum to analyze chitosan and modified chitosan in embodiment 2, obtain its infrared spectrum figure such as figure 2 Shown, wherein A is modified chitosan, B is chitosan. By comparing the spectra of chitosan and modified chitosan, it can be found that 1631cm -1 and 2972cm -1 The peaks at correspond to the characteristic peaks of the double bond and the methylene connected to it, indicating that acrylic acid has been grafted onto the chitosan structure through phenylphosphonyl dichloride.

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