Silver-plated conductive nylon fiber and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11982047-B2
Application number	US-202117798179-A
Country	US
Kind code	B2
Filing date	Jun 4, 2021
Priority date	May 31, 2021
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

The invention provides a silver-plated conductive nylon fiber and a preparation method thereof. The method includes: immersing a nylon fiber in an aqueous solution containing a polyphenolic compound at 60° C. to 70° C., adding a water-soluble oxidant into the solution, continuously reacting at 70° C. to 80° C., and obtaining a polyphenol grafted nylon fiber, where the polyphenolic compound contains a catechol group; immersing the polyphenol grafted nylon fiber into a solution containing silver ions at 15° C. to 25° C. for reaction, and raising the temperature to 70° C. to 80° C. for continuous reaction to obtain a surface-activated nylon fiber; and carrying out chemical silver plating treatment on the surface-activated nylon fiber to obtain the silver-plated conductive nylon fiber. The method does not require a heavy metal sensitizer and therefore is non-toxic and environment-friendly, and the fiber strength is maintained.

First claim

What is claimed is:

1. A method for preparing a silver-plated conductive nylon fiber, comprising steps of:
(1) immersing a nylon fiber in an aqueous solution containing a polyphenolic compound at 60° C. to 70° C., adding a water-soluble oxidant into the solution, continuously reacting the resultant reaction solution at 70° C. to 80° C., and obtaining a polyphenol grafted nylon fiber after the reaction is completed, wherein the polyphenolic compound contains a catechol group, and the aqueous solution of the polyphenolic compound has a concentration of 1 g/L to 5 g/L;
(2) immersing the polyphenol grafted nylon fiber obtained in the step (1) into a solution containing silver ions at 15° C. to 25° C. for reaction, and raising the temperature to 70° C. to 80° C. for continuous reaction to obtain a surface-activated nylon fiber, wherein in the solution containing silver ions, the concentration of silver ions is 1×10 −5 mol/L to 3×10 −5 mol/L; and
(3) carrying out chemical silver plating treatment on the surface-activated nylon fiber obtained in the step (2) to obtain the silver-plated conductive nylon fiber.

2. The method according to claim 1 , wherein before the step (1), the method further comprises step (la): soaking the nylon fiber in sulfuric acid with a concentration of 20 mL/L to 100 mL/L at 40° C. to 60° C. for 20 to 120 min.

3. The method according to claim 1 , wherein the chemical silver plating comprises: soaking the surface-activated nylon fiber obtained in the step (2) in a silver ammonia solution added with a reducing agent at 30° C. to 50° C. for reaction for 20 to 90 min.

4. The method according to claim 3 , wherein the reducing agent is selected from the group consisting of glucose, acetaldehyde, formaldehyde or any combination thereof.

5. The method according to claim 3 , wherein the silver ammonia solution is further added with a surfactant.

6. The method according to claim 5 , wherein the surfactant comprises polyvinylpyrrolidone and/or sodium dodecyl benzene sulfonate.

7. The method according to claim 5 , wherein the surfactant has a concentration of 5 g/L to 15 g/L.

8. The method according to claim 1 , wherein in the step (1), the polyphenolic compound is selected from the group consisting of eugenol, tannic acid, ferulic acid, chlorogenic acid and any combination thereof; the water-soluble oxidant is selected from the group consisting of sodium perborate, potassium perborate, sodium persulfate and any combination thereof; and in the reaction solution, the water-soluble oxidant has a concentration of 1 g/L to 3 g/L.

9. The method according to claim 1 , wherein after the step (3), the method further comprises a step (4): washing and dehydrating the silver-plated conductive nylon fiber, and drying at 90° C. to 140° C. for 2 to 10 min.

10. A silver-plated conductive nylon fiber prepared by the method according to claim 1 .

Assignees

• Univ Soochow

Inventors

• Xing Tieling
• Ai Xin
• Xie Ailing
• Lu Shenzhou
• Chen Guoqiang

Classifications

• D06M11/83 Primary

  with metals; with metal-generating compounds, e.g. metal carbonyls; Reduction of metal compounds on textiles · CPC title

• D06M13/175

  Unsaturated ethers, e.g. vinylethers · CPC title

• D06M13/207

  Substituted carboxylic acids, e.g. by hydroxy or keto groups; Anhydrides, halides or salts thereof · CPC title

• D06M13/2246

  Esters of unsaturated carboxylic acids · CPC title

• D06M13/238

  Tannins, e.g. gallotannic acids · CPC title