阅读说明：本技术 导电纱线的制造方法 (Method for manufacturing conductive yarn ) 是由 翁松翎 魏麒书 郭明智 于 2019-04-24 设计创作，主要内容包括：本发明提供一种导电纱线的制造方法,其包括以下步骤。提供异型断面纱线,其中所述异型断面纱线的表面具有沟槽。将所述异型断面纱线制成针织布。将所述针织布含浸于导电树脂溶液后,进行压吸步骤及干燥步骤,以形成导电针织布。将所述导电针织布解织,以形成导电纱线。所述导电纱线的制造方法的生产效率高且可制备出具有低电阻变异率的导电纱线。(The invention provides a manufacturing method of a conductive yarn, which comprises the following steps. Providing the special-shaped section yarn, wherein the surface of the special-shaped section yarn is provided with grooves. And manufacturing the special-shaped section yarns into knitted fabrics. And after the knitted fabric is soaked in a conductive resin solution, carrying out a pressure absorption step and a drying step to form the conductive knitted fabric. And unweaving the conductive knitted fabric to form conductive yarns. The manufacturing method of the conductive yarn has high production efficiency and can prepare the conductive yarn with low resistance variation rate.)

1. A method of making an electrically conductive yarn, comprising:

providing a special-shaped section yarn, wherein the surface of the special-shaped section yarn is provided with a groove;

preparing the special-shaped section yarns into knitted fabrics;

after the knitted fabric is soaked in a conductive resin solution, carrying out a pressure absorption step and a drying step to form a conductive knitted fabric; and

and unweaving the conductive knitted fabric to form conductive yarns.

2. The method of claim 1, wherein the profile cross-section yarn comprises a cross-section yarn, a straight-section yarn, a trilobal cross-section yarn, or a quincunx cross-section yarn.

3. The method of claim 1, wherein the profiled cross-section yarn comprises polyester or nylon.

4. The method of manufacturing conductive yarn according to claim 1, wherein said knitted fabric comprises a plain knitted fabric.

5. The method for manufacturing an electrically conductive yarn according to claim 1, wherein the electrically conductive resin solution comprises:

25 to 45 parts by weight of an aqueous resin dispersion;

50 to 70 parts by weight of a conductive material; and

1 to 5 parts by weight of a bridging agent having isocyanate groups.

6. The method of manufacturing a conductive yarn according to claim 5, wherein the aqueous resin dispersion comprises an aqueous polyurethane resin dispersion or an aqueous acryl resin dispersion, and the conductive material comprises a nano silver powder, a silver wire, a silver flake, or a combination thereof.

7. The method for manufacturing the conductive yarn according to claim 5, wherein the viscosity of the conductive resin solution is between 10,000cps and 30,000 cps.

8. The method of manufacturing an electrically conductive yarn according to claim 1, wherein the pressure of the pressure-suction step is between 2kg/cm²To 4kg/cm²In the meantime.

9. The method for manufacturing a conductive yarn according to claim 1, wherein the variation rate of the line resistance of the conductive yarn is 10% or less.

10. The method for producing a conductive yarn according to claim 1, further comprising surface modification of the profiled cross-section yarn or the knitted fabric before immersing the knitted fabric in the conductive resin solution.

Technical Field

The invention relates to a textile technology, in particular to a manufacturing method of conductive yarns.

Background

With the development of science and technology, the application of textiles in daily life is beginning to expand from the field of clothing to other fields. People's requirements for textiles are not limited to the function of heat preservation, and textile manufacturers and manufacturers also want to combine the textiles with technologies in different fields, so as to improve the added value of the textiles and enable the applications of the textiles to be more flexible.

In recent years, electronic textiles have become a new favorite of the world internet of things and the portable digital care age. However, the conventional electronic fibers or conductive yarns have problems of insufficient conductivity or excessively high resistance variation rate. In addition, the existing vacuum sputtering silver plating or chemical silver plating method has slow manufacturing process and is easy to break yarn due to uneven tension. Accordingly, there is a need for an improved method of making conductive yarns.

Disclosure of Invention

In view of the above, the present invention provides a method for manufacturing a conductive yarn, which has high production efficiency and can manufacture a conductive yarn with low resistance variation rate.

The invention provides a manufacturing method of a conductive yarn, which comprises the following steps. Providing the special-shaped section yarn, wherein the surface of the special-shaped section yarn is provided with grooves. And manufacturing the special-shaped section yarns into knitted fabrics. And after the knitted fabric is soaked in a conductive resin solution, carrying out a pressure absorption step and a drying step to form the conductive knitted fabric. And unweaving the conductive knitted fabric to form conductive yarns.

In an embodiment of the invention, the yarn with special-shaped cross section includes a cross-shaped cross-section yarn, a straight-shaped cross-section yarn, a trilobal cross-section yarn or a quincunx cross-section yarn.

In an embodiment of the invention, the material of the profiled cross-section yarn includes polyester or nylon.

In an embodiment of the present invention, the knitted fabric includes a single-side plain knitted fabric.

In an embodiment of the invention, the conductive resin solution includes 25 to 45 parts by weight of the aqueous resin dispersion, 50 to 70 parts by weight of the conductive material, and 1 to 5 parts by weight of a bridging agent having an isocyanate (NCO) group.

In an embodiment of the invention, the aqueous resin dispersion includes an aqueous polyurethane resin dispersion or an aqueous acryl resin dispersion, and the conductive material includes silver nanoparticles, silver wires, silver flakes, or a combination thereof.

In an embodiment of the invention, the viscosity of the conductive resin solution is between 10,000cps and 30,000 cps.

In an embodiment of the invention, the pressure applied in the pressing step is between 2kg/cm²To 4kg/cm²In the meantime.

In an embodiment of the invention, a variation rate of the line resistance of the conductive yarn is 10% or less.

In an embodiment of the present invention, the method further includes surface modification of the profiled cross-section yarn or the knitted fabric before impregnating the knitted fabric with the conductive resin solution.

Based on the above, the manufacturing method of the conductive yarn has high production efficiency, and is superior to the existing vacuum sputtering silver plating or chemical silver plating method. In addition, the conductive yarn prepared by the method has good conductivity and low resistance variation rate, and meets the requirements of users.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a flow chart illustrating a method of manufacturing a conductive yarn according to an embodiment of the present invention.

Fig. 2-5 are cross-sectional views of various profiled cross-section yarns according to various embodiments of the present invention.

Fig. 6-9 are cross-sectional views of various conductive yarns according to various embodiments of the present invention.

The reference numbers illustrate:

100. 101, 102, 103, 104, 106: step (ii) of

10a, 10b, 10c, 10 d: conductive yarn

G: groove

R: conductive resin

Y: special-shaped section yarn

Detailed Description

Fig. 1 is a flow chart illustrating a method of manufacturing a conductive yarn according to an embodiment of the present invention. Fig. 2-5 are cross-sectional views of various profiled cross-section yarns according to various embodiments of the present invention. Fig. 6-9 are cross-sectional views of various conductive yarns according to various embodiments of the present invention.

First, referring to fig. 1, step 100 is performed to provide a yarn with a special-shaped cross section, wherein a groove is formed on a surface of the yarn with the special-shaped cross section. In one embodiment, the material of the profiled cross-section yarn comprises polyester or nylon (nylon). The polyester component may comprise polyethylene terephthalate (PET). The nylon component may comprise Polyamide (PA). In the present invention, a profiled cross-section yarn is defined as a yarn whose cross-section is not perfectly circular. For example, the cross-section yarn Y in fig. 2 has a cross-section, the cross-section yarn Y in fig. 3 has a straight section, the cross-section yarn Y in fig. 4 has a trilobal section, and the cross-section yarn Y in fig. 5 has a quincunx section. The surface of the profile cross-section yarn Y in fig. 2 to 5 has a plurality of grooves G.

It will be appreciated by those skilled in the art that the profiled cross-section yarns shown in figures 2 to 5 are for illustration only and are not intended to limit the invention. In other words, other shapes of profiled yarns (e.g., profiled yarns having a C-shaped cross-section) are possible, so long as such profiled yarns have grooves that can accommodate the subsequently formed conductive resin.

Then, step 101 is optionally performed to perform surface modification on the irregularly shaped cross-section yarn. The surface modification step is to make the surface of the profiled cross-section yarn have hydrophilicity (such as hydroxyl (OH) groups) so as to enhance the fixing force between the subsequently formed conductive resin and the profiled cross-section yarn. In one embodiment, the surface modification step can be performed using a 10% to 20% NaOH solution at 70 ℃ to 80 ℃.

Then, step 102 is performed to make the profiled cross-section yarn into a knitted fabric. In one embodiment, the knitted fabric comprises a knitted fabric suitable for unraveling, such as a plain single knit fabric.

Then, step 103 is optionally performed to perform surface modification on the knitted fabric. The surface modification step is to make the surface of the profiled cross-section yarn in the knitted fabric have hydrophilicity (for example, have OH group) so as to enhance the fixing force between the conductive resin formed subsequently and the profiled cross-section yarn. In one embodiment, the surface modification step can be performed using a 10% to 20% NaOH solution at 70 ℃ to 80 ℃.

In particular, in the present invention, the steps 101 and 103 are performed alternatively, and the hydrophilic modification step can be performed on the profiled cross-section yarn by selecting an appropriate process stage according to the requirement.

Next, in step 104, after the knitted fabric is impregnated with the conductive resin solution, the pressure suction step and the drying step are performed to form a conductive knitted fabric.

The impregnation step is to fix the conductive resin on the surface of the profiled cross-section yarn through the bridging agent. In one embodiment, the conductive resin solution includes 25 to 45 parts by weight of the aqueous resin dispersion, 50 to 70 parts by weight of the conductive material, and 1 to 5 parts by weight of a bridging agent having an isocyanate (NCO) group. The conductive resin solution is also called an impregnation solution, and the impregnation time of the impregnation step is 1 second to 10 seconds. In one embodiment, the aqueous resin dispersion comprises an aqueous polyurethane resin dispersion or an aqueous acrylic resin dispersion, and the solid content of the polyurethane or the acrylic resin is, for example, between 5 wt% and 20 wt%. In one embodiment, the conductive material includes silver nanoparticles, silver wires, silver flakes, or a combination thereof. In one embodiment, the concentration of silver (abbreviated as silver-containing concentration) in the conductive resin solution is, for example, between 50 wt% and 70 wt%. In one embodiment, the viscosity of the conductive resin solution (abbreviated as resin viscosity) is between 10,000cps and 30,000cps, such as 12,000cps, 15,000cps, 18,000cps, 20,000cps, 25,000cps, 28,000cps or a range therebetween. In one embodiment, the viscosities are measured by a rotary Viscometer, model DV-II + Pro Viscometer, manufactured by Brookfield, USA.

The pressure suction step is to remove the excess conductive resin and to make the conductive resin adhere to the profile cross-sectional yarn for forming the knitted fabric more favorably. In one embodiment, the pressure applied in the pressing step is between 2kg/cm²To 4kg/cm²E.g. 2.5kg/cm²、3kg/cm²、3.5kg/cm²Or ranges between the above values.

The drying step is to remove excess solvent. In one embodiment, the drying step is carried out at a temperature of 80 ℃ to 150 ℃ for 5 minutes to 60 minutes.

After the surface modification step, the impregnation step, the pressure absorption step and the drying step, the conductive resin is fixed in the grooves of the special-shaped cross-section yarns. More specifically, the surface modification step generates OH groups on the surface of the yarn with the special-shaped cross section, and the OH groups can be bonded with a bridging agent with NCO groups in the conductive resin, so that the fixing force between the conductive resin and the yarn with the special-shaped cross section is improved.

Then, step 106 is performed to unwoven the conductive knitted fabric to form conductive yarns. Thus, the intrinsic conductive yarn of the present invention is manufactured. Here, the "unweaving" in the present invention is a reducing step of unraveling the knitted fabric into a plurality of yarns having different cross-sections. After the knitted fabric is impregnated with the conductive resin solution (as described in step 104), the knitted fabric becomes a conductive knitted fabric, and the profiled cross-section yarns thereon are also adhered with the conductive resin to have conductivity, so that the conductive knitted fabric is unwoven, and then the conductive profiled cross-section yarns become conductive yarns.

For example, the conductive yarn 10a in fig. 6 includes a profile yarn Y having a cross-shaped cross-section, and a conductive resin R fixed in a groove G on the surface of the profile yarn Y. The conductive yarn 10b in fig. 7 includes a profile yarn Y having a straight cross section, and a conductive resin R fixed not only in the groove G but also on the surface outside the groove G on the surface of the profile yarn Y. The conductive yarn 10c in fig. 8 includes a profile yarn Y having a trilobal profile, and a conductive resin R fixed in a groove G on the surface of the profile yarn Y. The conductive yarn 10d in fig. 9 includes a yarn Y having a cross section of a quincunx type and a conductive resin R fixed in grooves G on the surface of the yarn Y.

The method of the invention can greatly improve the adhesiveness of the conductive resin in the conductive yarn, so that the conductive yarn has good conductive property and low resistance variation degree. In one embodiment, the variation rate or Coefficient of Variation (CV) of the line resistance of the conductive yarn is 10% or less. The variation rate of the line resistance is defined as a percentage value of the standard deviation divided by the mean of the resistance data of a plurality (e.g., 100 or more).

Hereinafter, a plurality of experimental examples and comparative examples will be listed to verify the efficacy of the present invention.

< test of variation rate of line resistance of conductive yarn >

First, referring to the parameters of example 1 in table one, a profiled cross-section yarn having grooves was provided, the fiber pattern and specification of which was polyester cross-yarn 75d/48 f. Then, the profiled cross-section yarn is made into a knitted fabric, and the fabric specification (basis weight) of the knitted fabric is 80g/m². Then, the knitted fabric is impregnated in a conductive resin solution, and a pressure absorption step and a drying step are performed to form the conductive knitted fabric. The conductive resin solution in the impregnation step includes 35 parts by weight of an aqueous resin dispersion, 60 parts by weight of a conductive material, and 5 parts by weight of a bridging agent, wherein the aqueous resin dispersion is an aqueous polyurethane resin (model 9080, provided by changxing corporation), the conductive material is silver powder (provided by yibi corporation), and the bridging agent is an isocyanate bridging agent (model CA100, provided by bayer corporation). The silver concentration in the impregnation step was 60 wt%, the viscosity of the resin was 28,000cps, and the impregnation time was 10 seconds. The impregnation amount is defined as the weight difference between the fabric after impregnation and the fabric before impregnationDivided by the weight of the fabric before impregnation. The pressure in the pressure-suction step was 3kg/cm². The drying step is carried out at a temperature of 100 ℃ for 5 minutes. Subsequently, the conductive knitted fabric was unwoven to form the conductive yarn of example 1. Then, the conductive yarn of example 1 was subjected to line resistance measurement and the variation rate was calculated.

The conductive yarns of examples 2-5 and comparative example 1 were prepared according to the parameters of table one and the experimental procedure of example 1. Then, the conductive yarns of examples 2 to 5 and comparative example 1 were subjected to line resistance measurement to calculate the variation rate.

Watch 1

As can be seen from the table, the pressure-suction pressure of the present invention preferably falls within 2kg/cm²To 4kg/cm²The variation rate of the line resistance of the conductive yarn can be controlled to be less than 10%. When the pressure is too low, the conductive resin solution remains on the conductive knitted fabric, and the conductive knitted fabric cannot be smoothly unwoven. When the pressure absorption pressure is too high, the line resistance of the conductive yarn is too high, and the variation rate is up to 12% due to uneven distribution of the conductive resin on the conductive yarn. In addition, according to the results of experimental examples 1 to 5, the prepared conductive yarn has good conductivity and low resistance variation rate regardless of polyester conductive yarn or nylon conductive yarn, cross-shaped section or straight-shaped section.

< ultrasonic vibration test and Water washing test of conductive yarn >

The polyester conductive yarn of experimental example 2 was subjected to an ultrasonic vibration test using an ultrasonic cleaner (type)Ultrasonic Cleaner DC200H, available from deltoid instruments) and water wash standard CNS 15140(8B gentle wash) with results as shown in table two.

Watch two

Number of strands	Single strand	Double ply twist
			Line resistor	96	45
Line resistance after 0.5 hour of ultrasonic oscillation	98	48
			Line resistance after 1 hour of ultrasonic oscillation	105	49
Line resistance after washing for 5 times	101	50
			Line resistance after washing for 10 times	116	53
Line resistance after 20 times of water washing	126	64

As can be seen from table two, after the ultrasonic oscillation test and the water washing test, the difference of the line resistance of the polyester conductive yarn of experimental example 2 is not large, which means that the fixing force between the conductive resin and the yarn with the special-shaped cross section is excellent, and the conductive resin does not detach from the surface of the yarn with the special-shaped cross section due to the ultrasonic oscillation or water washing.

The nylon conductive yarn of experimental example 4 was subjected to a water wash test with CNS 15140(8B soft wash) as the standard, with the results shown in table three.

Watch III

Number of strands	Single strand	Double ply twist
			Line resistor	97	46
Line resistance after washing for 5 times	103	48
			Line resistance after washing for 10 times	112	52

As can be seen from table three, after the nylon conductive yarn of experimental example 4 is subjected to the water washing test, the difference of the line resistance is not large, which means that the adhesion between the conductive resin and the yarn with the special-shaped cross section is excellent, and the conductive resin does not desorb the surface of the yarn with the special-shaped cross section due to the water washing.

In addition, the conductive yarn disclosed by the invention is tested for washing fastness according to CNS 1494L3027, and the conductive yarn is faded by 4 grades and stained by 4-5 grades. The conductive yarn disclosed by the invention is tested for fastness to perspiration according to CNS 1496L3029, and the acid fading grade and the acid staining grade of the conductive yarn are 4-5 and 4-5; alkaline discoloration and fading is of grade 4-5, and staining is of grade 4-5. The conductive yarn disclosed by the invention is tested for abrasion resistance fastness according to CNS 1499L3032, and has dry friction fastness of 4-5 grades and wet friction fastness of 3 grades.

In conclusion, the manufacturing method of the conductive yarn has high production efficiency and is superior to the existing vacuum sputtering silver plating or chemical silver plating method. In addition, the conductive yarn prepared by the method has good conductivity and low resistance variation rate, and meets the requirements of users. In addition, the conductive yarn disclosed by the invention is resistant to washing, sweat and friction, and has market competitiveness.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.