CN102808327B - Method for preparing nylon-PEDOT (poly(3,4-ethylenedioxythiophene)) compound conductive fabric through in-situ polymerization - Google Patents

Abstract

The invention relates to a method for preparing nylon/PEDOT composite conductive fabric by in-situ polymerization, including: (1) pretreating the nylon fabric with an acid solution, two dipping and two rolling, the dipping time is 5 to 15 minutes, and the rolling ratio is 60% ~90%; (2) Immerse the above nylon fabric in the mixed solution containing ferric chloride, sodium polystyrene sulfonate and 3,4-ethylenedioxythiophene EDOT, the reaction temperature is 30-90°C, and the reaction time is 1- After 20 hours, after the reaction is over, take out the fabric, wash and dry it. The method of the invention combines the padding process commonly used in dyeing and finishing, so that PEDOT quickly enters the interior of nylon fibers, shortens the reaction time, and causes less environmental pollution; it is applied to textile chemical sensing, bioremediation materials, electromagnetic shielding materials, and the like.

Description

A kind of method for preparing nylon/PEDOT composite conductive fabric by in-situ polymerization

technical field

The invention belongs to the field of preparation of composite conductive fabrics, in particular to a method for preparing nylon/PEDOT composite conductive fabrics by in-situ polymerization.

Background technique

Due to their unique chemical and electrochemical properties, conductive polymer materials have broad application prospects in the fields of conductive coatings, secondary batteries, optoelectronic devices, gas sensors, electromagnetic shielding, metal anti-corrosion and stealth technology.

Conductive polymer poly 3,4-ethylenedioxythiophene (PEDOT for short), has received extensive attention due to its high electrical conductivity, good environmental stability and film transparency, and has been widely used in antistatic coatings, photodiodes , sensors, etc. have also shown broad application prospects, but due to the insolubility and infusibility of PEDOT, it is difficult to process and handle, thus limiting its commercial application.

Polystyrene sulfonic acid (PSS) is introduced into PEDOT as a dopant so that the sulfur on the thiophene is connected to the dopant. Due to the effect of the hydrophilic functional group, the long chain of PEDOT can be stretched open, so that PEDOT can pass through with PSS. Mixed in a certain proportion and dissolved in water to form a uniformly dispersed PEDOT:PSS aqueous solution, while changing the valence state of PEDOT, thereby improving the conductivity.

Nylon is a typical polar crystalline polymer. In the repeating unit of the main chain of the macromolecule, there is a polar group amide bond (-CONH-). In neutral solution, nylon exists as a zwitterionic structure ( ⁺ NH ₃ -nylon-COO-). Under acidic conditions, carboxylic acid ions were protonated, nylon fibers existed in the form of terminal amine groups, and the polarity increased, and nylon could well adsorb PEDOT-PSS.

Using textiles as the base material, using the "on-site" adsorption polymerization method, the conductive polymer is adsorbed on the surface of the matrix fiber as a conductive covering layer to make it conductive. The fibers prepared by this method have both electrical conductivity and physical and mechanical properties of matrix fibers. Great progress has been made in the field of smart textiles, and they are widely used in textile chemical sensing, bioremediation materials, electromagnetic shielding materials, etc.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for preparing nylon/PEDOT composite conductive fabric by in-situ polymerization. The method combines the commonly used impregnation process in dyeing and finishing, so that PEDOT can quickly enter the interior of the nylon fiber and improve the electrical conductivity of the composite fabric. Moreover, the cost is low, and the pollution to the environment is small; the square resistance of the prepared composite conductive fabric is 0.20-2.75KΩ/□, the strength does not change much, and it has good antistatic and electromagnetic shielding functions.

A kind of in-situ polymerization of the present invention prepares the method for nylon/PEDOT composite conductive fabric, comprises:

(1) Pretreat the nylon fabric with an acid solution, two dipping and two rolling, the dipping time is 5 to 15 minutes, and the excess rolling rate is 60% to 90%;

(2) Immerse the above nylon fabric in a mixed solution containing ferric chloride, sodium polystyrene sulfonate and 3,4-ethylenedioxythiophene EDOT, the reaction temperature is 30-90°C, the reaction time is 1-20h, and the reaction After the end, take out the fabric, wash and dry it, and get it; the concentration of ferric chloride is 0.05mol/L-0.3mol/L, the concentration of sodium polystyrene sulfonate is 5-30g/L, EDOT and ferric chloride The molar ratio is 1:2.

The acid solution in the step (1) is acetic acid, hydrochloric acid or sulfuric acid with a pH value of 3-4.

The sodium polystyrene sulfonate in the step (2) has an average molecular weight of 5000-60000.

The fabric washing in the step (2) is specifically to first wash off the surface attachments with deionized water, and then soak and wash the fabric with absolute ethanol until the washing liquid is colorless.

The drying temperature in the step (2) is 40-60°C.

The square resistance of the nylon/PEDOT composite conductive fabric obtained in the step (2) is 0.20-2.75KΩ/□.

Beneficial effect

The present invention prepares the method for nylon/PEDOT composite conductive fabric by in-situ polymerization method, this method is combined with the padding process commonly used in dyeing and finishing, makes PEDOT enter nylon fiber interior rapidly, improves the electrical conductivity of composite fabric, and cost is lower, to The environmental pollution is small; the square resistance of the prepared composite conductive fabric can reach 0.20-2.75KΩ/□, the strength does not change much, and it has good flame retardancy, water repellency, antibacterial, antistatic and electromagnetic shielding functions.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

First, the nylon fabric is treated with a hydrochloric acid solution with pH = 4, two dipping and two rolling, the dipping time is 10min, and the scrapping rate is 70%; then the treated nylon fabric is immersed in EDOT concentration of 0.1mol/L, ferric chloride concentration 0.2mol/L, in 20g/L sodium polystyrene sulfonate solution. The reaction temperature is 70°C, and the reaction time is 10h. After the reaction is complete, remove the fabric. First wash off the surface attachments with deionized water, then soak and wash the fabric with absolute ethanol until the washing solution is colorless, and dry at 60°C to obtain a nylon/PEDOT composite conductive fabric. The square resistance of the conductive fabric is 0.20KΩ/□.

Example 2

First, the nylon fabric is treated with a hydrochloric acid solution with pH = 4, two dipping and two rolling, the dipping time is 5 minutes, and the pass rate is 70%; then the treated nylon fabric is immersed in EDOT concentration of 0.1mol/L, ferric chloride concentration 0.2mol/L, in 15g/L sodium polystyrene sulfonate solution. The reaction temperature is 70°C, and the reaction time is 15h. After the reaction is complete, remove the fabric. First wash off the surface attachments with deionized water, then soak and wash the fabric with absolute ethanol until the washing solution is colorless, and dry at 60°C to obtain a nylon/PEDOT composite conductive fabric. The square resistance of the conductive fabric is 1.89KΩ/□.

Example 3

First, the nylon fabric is treated with a hydrochloric acid solution with pH = 4, two dipping and two rolling, the dipping time is 10min, and the scrapping rate is 70%; then the treated nylon fabric is immersed in EDOT concentration of 0.1mol/L, ferric chloride concentration 0.2mol/L, in 20g/L sodium polystyrene sulfonate solution. The reaction temperature is 60° C., and the reaction time is 10 h. After the reaction is complete, remove the fabric. First wash off the surface attachments with deionized water, then soak and wash the fabric with absolute ethanol until the washing solution is colorless, and dry at 60°C to obtain a nylon/PEDOT composite conductive fabric. The square resistance of the conductive fabric is 2.75KΩ/□.

Example 4

First, the nylon fabric is treated with a hydrochloric acid solution with pH = 4, two dipping and two rolling, the dipping time is 5 minutes, and the pass rate is 70%; then the treated nylon fabric is immersed in EDOT concentration of 0.1mol/L, ferric chloride concentration 0.2mol/L in 10g/L sodium polystyrene sulfonate solution. The reaction temperature is 70°C, and the reaction time is 8h. After the reaction is complete, remove the fabric. First wash off the surface attachments with deionized water, then soak and wash the fabric with absolute ethanol until the washing solution is colorless, and dry at 60°C to obtain a nylon/PEDOT composite conductive fabric. The square resistance of the conductive fabric is 1.35KΩ/□.

Example 5

First, the nylon fabric is treated with a hydrochloric acid solution with pH = 4, two dipping and two rolling, the dipping time is 5 minutes, and the scrapping rate is 70%; then the treated nylon fabric is immersed in EDOT concentration of 0.20mol/L, ferric chloride concentration 0.40mol/L in 10g/L sodium polystyrene sulfonate solution. The reaction temperature is 70°C, and the reaction time is 10h. After the reaction is complete, remove the fabric. First wash off the surface attachments with deionized water, then soak and wash the fabric with absolute ethanol until the washing solution is colorless, and dry at 60°C to obtain a nylon/PEDOT composite conductive fabric. The square resistance of the conductive fabric is 0.99KΩ/□.

Claims (6)

1. in-situ polymerization is prepared a method for nylon/PEDOT composite conductive fabric, comprising:

(1) nylon fabrics is carried out to preliminary treatment with acid solution, two soak two rolls, and dip time is 5～15min, and pick-up is 60%～90%;

(2) above-mentioned nylon fabrics is immersed in the mixed solution of chloride containing iron, kayexalate and 3,4-ethylene dioxythiophene EDOT, reaction temperature is 30-90 ℃, and the reaction time is 1-20h, after reaction finishes, takes out fabric, and washing, oven dry, obtain; Wherein the concentration of iron chloride is 0.05mol/L-0.3mol/L, and the concentration of kayexalate is 5-30g/L, and the mol ratio of EDOT and iron chloride is 1:2.

2. a kind of in-situ polymerization according to claim 1 is prepared the method for nylon/PEDOT composite conductive fabric, it is characterized in that: the acid solution in described step (1) is acetic acid, hydrochloric acid or the sulfuric acid of pH value 3-4.

3. a kind of in-situ polymerization according to claim 1 is prepared the method for nylon/PEDOT composite conductive fabric, it is characterized in that: the mean molecule quantity of the kayexalate in described step (2) is 5000-60000.

4. a kind of in-situ polymerization according to claim 1 is prepared the method for nylon/PEDOT composite conductive fabric, it is characterized in that: in described step (2), fabric washing is specially the attachment that first washes away fabric face with deionized water, then uses soaked in absolute ethyl alcohol laundering of textile fabrics colourless to cleaning solution.

5. a kind of in-situ polymerization according to claim 1 is prepared the method for nylon/PEDOT composite conductive fabric, it is characterized in that: the bake out temperature in described step (2) is 40-60 ℃.

6. a kind of in-situ polymerization according to claim 1 is prepared the method for nylon/PEDOT composite conductive fabric, it is characterized in that: in described step (2), nylon/PEDOT composite conductive fabric sheet resistance of gained is 0.20～2.75K Ω/.