Flexible conductive fabric and preparation method thereof

Abstract

The invention relates to the technical field of conductive cloth, in particular to flexible conductive cloth which sequentially comprises a base material, a shading layer and a protective layer, and the base material is connected with the protective layer through the shading layer; the light shielding layer comprises the following components in parts by weight: 25-40 parts of a film forming substance, 7-14 parts of a light shielding material, 5-15 parts of an auxiliary agent, 10-15 parts of a light shielding material and 20-35 parts of deionized water; the protective layer comprises the following components in parts by weight: 30-40 parts of acrylic resin, 10-15 parts of a diluent and 1-4 parts of a thickening agent. The flexible conductive fabric has excellent electromagnetic shielding performance, shading performance and flexibility, the transmittance of the flexible conductive fabric in visible light and near-infrared bands is 0, dry rubbing color fastness and alcohol resistance tests are carried out on a coating on the surface of the flexible conductive fabric, the surface of the coating is not abnormal, the dry rubbing color fastness is level 5, and the requirement for use performance is met.

Description

Technical Field

[0001] The present invention relates to the technical field of conductive cloth, in particular to a flexible conductive cloth and a preparation method thereof. Background Art

[0002] Conductive fabric is generally based on polyester fiber cloth, which is electroplated with metal after pre-treatment to give it metallic properties and become conductive fiber cloth; conductive fabric is widely used in electronic products, especially electronic products with display functions. The black conductive tape with shading and electromagnetic shielding functions is usually made by electroplating black alloy directly on the surface of the fabric using electroplating technology. The process is complicated and the production cost is high. A thicker coating must be electroplated to achieve the purpose of shading. Although the traditional surface blackening process is simple and low in cost, the surface resistance of the black conductive fabric is high, the service life is short, and the coating will peel off after long-term use. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a flexible conductive cloth to solve the above problems.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a flexible conductive cloth, the flexible conductive cloth comprises a substrate, a light shielding layer and a protective layer in sequence, the substrate is connected to the protective layer through the light shielding layer;

[0005] The light-shielding layer comprises the following components in parts by weight: 25-40 parts of film-forming substance, 7-14 parts of light-shielding material, 5-15 parts of auxiliary agent, 10-15 parts of light-shielding material, and 20-35 parts of deionized water; the film-forming substance is water-based polyurethane resin or water-based polyamide-imide resin; the light-shielding material is water-soluble pigment carbon black; the light-shielding material is titanium dioxide or magnesium oxide or zirconium oxide;

[0006] The protective layer comprises the following components in parts by weight: 30-40 parts of acrylic resin, 10-15 parts of diluent, and 1-4 parts of thickener; the diluent is a composition of toluene and dimethylformamide, and the weight ratio is 3:(3-4).

[0007] As a further solution of the present invention, the thickness of the protective layer is 1-2 μm; the thickness of the light shielding layer is 2-5 μm.

[0008] As a further embodiment of the present invention, the auxiliary agent is a water-soluble auxiliary agent, and the auxiliary agent includes the following components in parts by weight: 10-20 parts of dispersant, 10-20 parts of defoaming agent, 20-50 parts of wetting agent, 10-25 parts of thickener, 5-15 parts of adhesion promoter and 5-15 parts of film-forming auxiliary agent.

[0009] As a further embodiment of the present invention, the particle size of the water-soluble carbon black pigment is 20-30 nm.

[0010] As a further solution of the present invention, the particle size of the titanium dioxide, magnesium oxide or zirconium oxide is 15-25 nm.

[0011] As a further embodiment of the present invention, the dispersant is DS-162 or DS-192, the defoamer is BYK025, the adhesion promoter is S510 or A186, the wetting agent is BYK333 or BYK346 or BYK23687, the thickener is 108F polyurethane associative thickener or PTF thickener, and the film-forming aid is dipropylene glycol butyl ether or alcohol ester twelve.

[0012] A method for preparing a flexible conductive cloth, the specific steps are as follows:

[0013] Step 1, weighing a film-forming substance, a light-shielding material, an auxiliary agent, a light-shielding material, and deionized water by weight, stirring and mixing, and obtaining a light-shielding semi-finished coating;

[0014] Step 2, adding the semi-finished light-shielding coating in step 1 into an ultrafine nano grinder, grinding and adjusting the viscosity to obtain a light-shielding coating;

[0015] Step 3, weighing acrylic resin, diluent, and thickener according to weight, stirring and mixing, and adjusting viscosity to obtain a protective liquid;

[0016] Step 4: spray the light-shielding coating on one side of the substrate using an inkjet printer or a coating machine, and heat and cure the coating to obtain a light-shielding layer;

[0017] Step 5: Use an inkjet printer or a coating machine to spray the protective liquid on the surface of the light-shielding layer, and heat and cure it to obtain a flexible conductive fabric.

[0018] As a further solution of the present invention, in the step 1, the stirring speed is 1500-2000 r / min, and the stirring is performed for 3-4 hours.

[0019] As a further solution of the present invention, in the step 2, the ultrafine nano-grinding machine is rotated at a speed of 2000-3000 rr / min for 20-24 hours, and the viscosity of the light-shielding coating is less than 300 mPa.s.

[0020] As a further solution of the present invention, the stirring speed in step three is 1000-2000 r / min, and the stirring is for 2-3 hours; and the viscosity of the protective liquid in step two is less than 300 mPa.s.

[0021] Since the present invention adopts the above technical solution, the present invention has the following advantages and positive effects:

[0022] 1. The flexible conductive fabric of the present invention has excellent electromagnetic shielding performance and light-shielding performance, and a surface resistance of ≤50mΩ;

[0023] 2. The flexible conductive fabric of the present invention has excellent flexibility and a transmittance of 0 in the visible light and near infrared bands;

[0024] 3. The surface coating of the flexible conductive cloth was tested for dry friction color fastness and alcohol resistance. There was no abnormality on the coating surface and the dry friction color fastness was level 5, which met the performance requirements. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] Unless otherwise specified, all drugs / reagents used are commercially available.

[0028] Example 1

[0029] The present invention discloses a flexible conductive cloth, which comprises a substrate, a light-shielding layer and a protective layer in sequence, wherein the substrate is connected to the protective layer through the light-shielding layer, the thickness of the protective layer is 1 μm, and the thickness of the light-shielding layer is 2 μm; the light-shielding layer comprises the following components in parts by weight: 25 parts of waterborne polyurethane resin, 7 parts of water-soluble pigment carbon black with a particle size of 20 nm, 5 parts of an auxiliary agent, 10 parts of titanium dioxide with a particle size of 15 nm, and 20 parts of deionized water, wherein the auxiliary agent comprises the following components in parts by weight: 10 parts of DS-162, 10 parts of BYK025, 20 parts of BYK333, 10 parts of 108F polyurethane associative thickener, 5 parts of S510, and 5 parts of dipropylene glycol butyl ether;

[0030] The protective layer comprises the following components in parts by weight: 30 parts of acrylic resin, 5 parts of toluene, 5 parts of dimethylformamide, and 1 part of 108F polyurethane associative thickener.

[0031] The method for preparing the flexible conductive cloth of this embodiment has the following specific steps:

[0032] Step 1, weighing 25 parts of waterborne polyurethane resin, 7 parts of water-soluble pigment carbon black with a particle size of 20nm, 5 parts of additives, 10 parts of titanium dioxide with a particle size of 15nm, and 20 parts of deionized water, wherein the additives include the following components in parts by weight: 10 parts of DS-162, 10 parts of BYK025, 20 parts of BYK333, 10 parts of 108F polyurethane associative thickener, 5 parts of S510, and 5 parts of dipropylene glycol butyl ether, stirring at a speed of 1500r / min for 3h to obtain a light-shielding semi-finished coating;

[0033] Step 2, adding the semi-finished light-shielding coating in step 1 into an ultrafine nano-grinder at a rotation speed of 2000 rr / min, grinding for 20 hours, and adjusting the viscosity to 280 mPa.s to obtain a light-shielding coating;

[0034] Step 3: weigh 30 parts of acrylic resin, 5 parts of toluene, 5 parts of dimethylformamide, and 1 part of 108F polyurethane associative thickener, stir at a speed of 1000 r / min for 2 hours to mix, adjust the viscosity to 280 mPa.s, and obtain a protective solution;

[0035] Step 4: spray the light-shielding coating on one side of the substrate using an inkjet printer or a coating machine, and heat and cure the coating to obtain a light-shielding layer;

[0036] Step 5: Use an inkjet printer or a coating machine to spray the protective liquid on the surface of the light-shielding layer, and heat and cure it to obtain a flexible conductive fabric.

[0037] Example 2

[0038] The present invention discloses a flexible conductive cloth, which comprises a substrate, a light-shielding layer and a protective layer in sequence, wherein the substrate is connected to the protective layer through the light-shielding layer, the thickness of the protective layer is 1.5 μm, and the thickness of the light-shielding layer is 3.5 μm; the light-shielding layer comprises the following components in parts by weight: 33 parts of water-based polyamide-imide resin, 10 parts of water-soluble pigment carbon black with a particle size of 25 nm, 10 parts of an auxiliary agent, 13 parts of magnesium oxide with a particle size of 20 nm, and 28 parts of deionized water, wherein the auxiliary agent comprises the following components in parts by weight: 15 parts of DS-192, 15 parts of BYK025, 35 parts of BYK346, 20 parts of a PTF thickener, 10 parts of A186, and 10 parts of alcohol ester twelve;

[0039] The protective layer comprises the following components by weight: 35 parts of acrylic resin, 6 parts of toluene, 7 parts of dimethylformamide, and 2 parts of PTF thickener; the diluent is a composition with a weight ratio of 3:(3-4). The preparation method of the flexible conductive cloth of this embodiment comprises the following specific steps:

[0040] Step 1, weighing 33 parts of water-based polyamide-imide resin, 10 parts of water-soluble pigment carbon black with a particle size of 25 nm, 10 parts of additives, 13 parts of magnesium oxide with a particle size of 20 nm, and 28 parts of deionized water, wherein the additives include the following components in parts by weight: 15 parts of DS-192, 15 parts of BYK025, 35 parts of BYK346, 20 parts of PTF thickener, 10 parts of A186, and 10 parts of alcohol ester twelve, rotating at a speed of 1800 r / min, stirring for 3.5 hours to obtain a light-shielding semi-finished coating;

[0041] Step 2, adding the semi-finished light-shielding coating in step 1 into an ultrafine nano-grinder at a rotation speed of 2500 rr / min, grinding for 22 hours, adjusting the viscosity to 270 mPa.s, and obtaining a light-shielding coating;

[0042] Step 3: weigh 35 parts of acrylic resin, 6 parts of toluene, 7 parts of dimethylformamide, and 2 parts of PTF thickener, stir at a speed of 1500 r / min for 2.5 hours to mix, adjust the viscosity to 270 mPa.s, and obtain a protective solution;

[0043] Step 4: spray the light-shielding coating on one side of the substrate using an inkjet printer or a coating machine, and heat and cure the coating to obtain a light-shielding layer;

[0044] Step 5: Use an inkjet printer or a coating machine to spray the protective liquid on the surface of the light-shielding layer, and heat and cure it to obtain a flexible conductive fabric.

[0045] Example 3

[0046] The present invention provides a flexible conductive cloth, which comprises a substrate, a light shielding layer and a protective layer in sequence, wherein the substrate is connected to the protective layer through the light shielding layer, the thickness of the protective layer is 2 μm, and the thickness of the light shielding layer is 5 μm;

[0047] The light-shielding layer comprises the following components in parts by weight: 25-40 parts of waterborne polyurethane resin, 7-14 parts of water-soluble pigment carbon black with a particle size of 30 nm, 5-15 parts of additives, 10-15 parts of zirconium oxide with a particle size of 25 nm, and 20-35 parts of deionized water, wherein the additives comprise the following components in parts by weight: 20 parts of DS-162, 20 parts of BYK025, 750 parts of BYK2368, 25 parts of PTF thickener, 15 parts of S510, and 15 parts of alcohol ester twelve;

[0048] The protective layer comprises the following components in parts by weight: 40 parts of acrylic resin, 6 parts of toluene, 9 parts of dimethylformamide, and 4 parts of PTF thickener.

[0049] The method for preparing the flexible conductive cloth of this embodiment has the following specific steps:

[0050] Step 1, weighing 25-40 parts of waterborne polyurethane resin, 7-14 parts of water-soluble pigment carbon black with a particle size of 30nm, 5-15 parts of additives, 10-15 parts of zirconium oxide with a particle size of 25nm, and 20-35 parts of deionized water, wherein the additives include the following components by weight: 20 parts of DS-162, 20 parts of BYK025, 750 parts of BYK2368, 25 parts of PTF thickener, 15 parts of S510, and 15 parts of alcohol ester twelve, stirring and mixing to obtain a light-shielding semi-finished coating;

[0051] Step 2: Add the semi-finished light-shielding coating in step 1 into an ultrafine nano-grinder at a rotation speed of 3000 rr / min, grind for 24 hours, and adjust the viscosity to 260 mPa.s to obtain a light-shielding coating;

[0052] Step 3: weigh 40 parts of acrylic resin, 6 parts of toluene, 9 parts of dimethylformamide, and 4 parts of PTF thickener, stir at a speed of 2000 r / min for 3 hours to mix, adjust the viscosity to 260 mPa.s, and obtain a protective solution;

[0053] Step 4: spray the light-shielding coating on one side of the substrate using an inkjet printer or a coating machine, and heat and cure the coating to obtain a light-shielding layer;

[0054] Step 5: Use an inkjet printer or a coating machine to spray the protective liquid on the surface of the light-shielding layer, and heat and cure it to obtain a flexible conductive fabric.

[0055] The test method for surface resistance is: ASTM-D-991 standard test

[0056] The test method for coating peel strength is: ASTM D3359-09 standard test

[0057] The test method for dry rubbing color fastness is: ISO 105X 12:2016 standard test

[0058] Table 1 is the performance test of Examples 1-3

[0059]

[0060] It can be seen from Table 1 that the flexible conductive cloth of the present invention has excellent electromagnetic shielding performance and light-shielding performance, excellent flexibility, and a transmittance of 0 in the visible light and near-infrared bands. The surface coating of the flexible conductive cloth is tested for dry friction color fastness and alcohol resistance. There is no abnormality on the coating surface and the dry friction color fastness is level 5, which meets the performance requirements.

[0061] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A flexible conductive fabric, characterized in that: The flexible conductive fabric comprises a substrate, a light shielding layer and a protective layer in sequence, and the substrate is connected to the protective layer through the light shielding layer; The light-shielding layer comprises the following components in parts by weight: 25-40 parts of film-forming substance, 7-14 parts of light-shielding material, 5-15 parts of auxiliary agent, 10-15 parts of light-shielding material, and 20-35 parts of deionized water; the film-forming substance is water-based polyurethane resin or water-based polyamide-imide resin; the light-shielding material is water-soluble pigment carbon black; the light-shielding material is titanium dioxide or magnesium oxide or zirconium oxide; The protective layer comprises the following components in parts by weight: 30-40 parts of acrylic resin, 10-15 parts of diluent, and 1-4 parts of thickener; the diluent is a composition of toluene and dimethylformamide, and the weight ratio is 3:(3-4).

2. The flexible conductive fabric according to claim 1, characterized in that: The thickness of the protective layer is 1-2 μm; the thickness of the light shielding layer is 2-5 μm.

3. The flexible conductive fabric according to claim 1, characterized in that: The auxiliary agent is a water-soluble auxiliary agent, and the auxiliary agent includes the following components in parts by weight: 10-20 parts of a dispersant, 10-20 parts of a defoaming agent, 20-50 parts of a wetting agent, 10-25 parts of a thickener, 5-15 parts of an adhesion promoter, and 5-15 parts of a film-forming auxiliary agent.

4. The flexible conductive fabric according to claim 1, characterized in that: The particle size of the water-soluble carbon black pigment is 20-30 nm.

5. The flexible conductive fabric according to claim 1, characterized in that: The particle size of the titanium dioxide, magnesium oxide or zirconium oxide is 15-25 nm.

6. The flexible conductive fabric according to claim 3, characterized in that: The dispersant is DS-162 or DS-192, the defoamer is BYK025, the adhesion promoter is S510 or A186, the wetting agent is BYK333 or BYK346 or BYK23687, the thickener is 108F polyurethane associative thickener or PTF thickener, and the film-forming aid is dipropylene glycol butyl ether or alcohol ester twelve.

7. A method for preparing a flexible conductive fabric according to any one of claims 1 to 6, characterized in that: Specific steps as follows: Step 1, weighing a film-forming substance, a light-shielding material, an auxiliary agent, a light-shielding material, and deionized water by weight, stirring and mixing, and obtaining a light-shielding semi-finished coating; Step 2, adding the semi-finished light-shielding coating in step 1 into an ultrafine nano grinder, grinding and adjusting the viscosity to obtain a light-shielding coating; Step 3, weighing acrylic resin, diluent, and thickener according to weight, stirring and mixing, and adjusting viscosity to obtain a protective liquid; Step 4: spray the light-shielding coating on one side of the substrate using an inkjet printer or a coating machine, and heat and cure the coating to obtain a light-shielding layer; Step 5: Use an inkjet printer or a coating machine to spray the protective liquid on the surface of the light-shielding layer, and heat and cure it to obtain a flexible conductive fabric.

8. The method for preparing a flexible conductive cloth according to claim 7, characterized in that: In the step 1, the stirring speed is 1500-2000 r / min, and the stirring is performed for 3-4 hours.

9. The method for preparing a flexible conductive cloth according to claim 7, characterized in that: In the step 2, the ultrafine nano grinder is rotated at a speed of 2000-3000 rr / min for 20-24 hours, and the viscosity of the light-shielding coating is less than 300 mPa.s.

10. The method for preparing a flexible conductive cloth according to claim 7, characterized in that: In the step 3, the stirring speed is 1000-2000 r / min, and the stirring is for 2-3 hours; and in the step 2, the viscosity of the protective liquid is less than 300 mPa.s.

Images