Preparation method and application of conductive yarn

Abstract

The invention belongs to the technical field of conductive materials, and particularly relates to a preparation method and application of conductive yarn, and the preparation method comprises the following steps: a step of forming a deposition layer by releasing and supplying a base film wound in a winding shape and depositing conductive metal on the surface of the base film, the surface of the base film is coated with resin mixed with conductive pigments to form a coating, and the base film with the formed coating is cut into a certain width to form the conductive yarn. By greatly reducing the resistance value, the conductive yarn with improved conductivity is obtained.

Description

Technical Field

[0001] The invention relates to a preparation method of a conductive yarn and application thereof, belonging to the technical field of conductive materials. Background Art

[0002] Conductive yarn is a kind of yarn that can conduct electricity, and is usually made by mixing conductive carbon black or conductive metal compounds with fiber polymer compounds to form spun yarn. However, most of the conductive yarns proposed in the past have high resistance values ​​and cannot achieve satisfactory conductivity, so it is necessary to improve them. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing a conductive yarn and application thereof, wherein the preparation method can significantly reduce the resistance value, thereby preparing a conductive yarn with high conductivity.

[0004] In the present invention, a method for preparing a conductive yarn is proposed, which includes unwinding and supplying a wound base film, depositing a conductive metal on the surface of the base film to form a deposition layer, coating a resin on the surface of the base film forming the above deposition layer to form a coating, and cutting the base film forming the above coating into a predetermined width to form a conductive yarn, thereby achieving the above purpose.

[0005] The present invention also proposes the application of the conductive yarn prepared by the conductive yarn preparation method in the field of fabrics or wrapping paper.

[0006] The beneficial effect of the present invention is that the present invention obtains conductive yarn with improved conductivity by significantly reducing the resistance value.

[0007] [Prior technical literature]

[0008] [Patent Document] Korean Patent Publication (A) No. 10-2018-0104850 (September 27, 2018). BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram showing the structure of the conductive yarn of the present invention,

[0010] Figure 2 is an exemplary diagram showing the deposition layer formation process of the present invention,

[0011] Figure 3 is an exemplary diagram showing the coating formation process of the present invention,

[0012] Figure 4 2 is an exemplary diagram of the formation process of the conductive yarn of the present invention.

[0013] The reference numerals are recorded as follows: 100, base film; 100-1, deposition film; 100-2, coating film; 100-3, roll-cut film; 100-4, conductive yarn; 120, deposition layer; 140, coating; 200, vacuum deposition device; 220, crucible; 300, coating device; 320, mesh roller; 340, coating liquid barrel; 350, rubber roller; 360, cavity; 362, heater; 400, cutting device; 420, circular blade; 440, guide roller; 460, winding tube. DETAILED DESCRIPTION

[0014] In the present invention, a method for preparing a conductive yarn is proposed, comprising the steps of releasing a base film 100 wound in a coil while continuously supplying the base film 100, depositing a conductive metal on the surface of the base film 100 to form a deposition layer 120, coating a resin mixed with a conductive pigment on the surface of the base film 100 forming the deposition layer 120 to form a coating 140, and cutting the base film 100 forming the coating 140 into a predetermined width to form a conductive yarn.

[0015] like Figure 1 As shown, the conductive yarn of the present invention forms a deposition layer 120 and a coating layer 140 on the surface of the base film 100, and then is cut into a certain width. According to the method of the present invention, the conductive yarn is made by unwinding and feeding the rolled base film 100, forming a deposition layer 120 on the surface thereof, and then forming a coating layer 140 on the deposition layer 120, and then cutting it into a predetermined width to produce a conductive yarn of a desired thickness.

[0016] Here, the base film 100 may be formed using any one of a nylon (Polyamide, PA) film, a polyethylene (Polyethlene, PE) film, an oriented polypropylene (Oriented polypropylene, OPP) film, and a polyethylene terephthalate (Polyethylene terephthalate, PET) film.

[0017] In the embodiment of the present invention, a PET film is used as the base film 100, and the thickness of the PET film is 12 mic (ie 0.012 mm), the width is 1020 mm, and the length is 12000 meters.

[0018] The following describes in detail each step of the present invention:

[0019] S1. Steps for forming a deposition layer

[0020] like Figure 2 As shown, forming the deposition layer 120 on the base film 100 may be performed by a vacuum deposition apparatus 200 .

[0021] The vacuum deposition apparatus 200 performs deposition in a process of unwinding the base film 100 wound in a roll form.

[0022] The vacuum deposition device 200 includes a plurality of rollers supporting and guiding the base film 100 and a crucible 220 for vaporizing the conductive metal by heating. The vacuum deposition device 200 vaporizes the conductive metal in a vacuum environment to form a deposition layer 120 on the surface of the base film 100.

[0023] The crucible 220 is located below the advancing base film 100. The conductive metal may include gold, silver, copper, aluminum, bismuth, magnesium, zinc, nickel, iron, lead, antimony, etc. In the embodiment of the present invention, the conductive metal is aluminum.

[0024] The deposition is performed under vacuum. The conductive metal is injected into the crucible 220 and then heated to a vaporizable temperature according to the material properties. The conductive metal will then vaporize and adhere to the base film 100 .

[0025] In addition, a plurality of crucibles 220 may be provided, and the plurality of crucibles 220 may be provided at certain intervals, thereby achieving multiple depositions, thereby facilitating the deposition of the conductive metal to a sufficient thickness. In this process, the thickness of the deposition layer 120 may be adjusted according to the traveling speed of the base film 100 .

[0026] The deposition layer 120 may be formed on both sides of the base film 100. Although the deposition layer 120 may be formed on one surface of the base film 100, if the deposition layer 120 is not formed on both sides of the base film 100, it may not be conductive. In this way, conductive yarns with satisfactory performance may not be obtained, and therefore, it is preferred to form the deposition layer 120 on both sides of the base film 100.

[0027] As described above, the deposition layer 120 may be formed on either surface by the previously described method, and then the base film 100 may be turned over to form the deposition layer 120 on the other surface.

[0028] S2. Steps for forming a coating

[0029] like Figure 3 As shown, the coating layer 140 formed on the deposition layer 120 can be performed by a coating device 300. Since the deposition layer 120 formed on the base film 100 may be damaged by external force, in order to protect the deposition layer 120, a solution is coated on the deposition layer 120 by the coating device 300 to form the coating layer 140 to protect the deposition layer 120.

[0030] The coating device 300 coats the coating liquid as the base film 100 wound into a roll forming the deposition layer 120 is unwound, thereby forming the coating layer 140. To this end, the coating device 300 may include a plurality of rollers supporting and guiding the traveling base film 100 and a coating liquid barrel 340 filled with the coating liquid, a mesh roller 320 and a rubber roller 350 for forming the coating layer, and a chamber 360 having a heater 362.

[0031] The film forming the deposition layer 120 on the base film 100 is recorded as deposition film 100-1. The deposition film 100-1 passes through multiple guide rollers, passes between the mesh roller 320 and the rubber roller 350, and enters the cavity 360 with a heater 362 for thermal curing, thereby forming a coating 140 on the deposition layer 120. The film forming the coating 140 is recorded as coating film 100-2.

[0032] In this configuration, the mesh roller 320 arranged below is partially immersed in the coating liquid in the coating liquid barrel 340, and can immerse the coating liquid on the surface while rotating, thereby coating the coating liquid on the surface of the deposition film 100-1 passing between the mesh roller 320 and the rubber roller 350, that is, the deposition layer 120.

[0033] The mesh roller 320 disposed below has grooves formed on its outer surface so that it can be easily stained with the coating liquid. In addition, the rubber roller 350 disposed on the mesh roller 320 is made of a rubber material and can elastically press the mesh roller 320 to stably apply the coating liquid in the grooves on the surface of the mesh roller 320 to the surface of the deposition film 100-1.

[0034] The coating liquid may be made of resin, which may be one or more of epoxy resin, melamine resin, acrylic resin, polyurethane resin, and polyethylene terephthalate (PET).

[0035] In the embodiment of the present invention, the coating liquid is prepared by mixing epoxy resin and melamine resin in a weight ratio of about 3:1.

[0036] Conductive pigments are added to the coating liquid to add color to the product.

[0037] Add appropriate amount of methyl ethyl ketone (MEK), toluane, methanol, ethyl cellosolve or isopropyl alcohol to the coating liquid as described above, and stir together to allow the components to be mixed smoothly.

[0038] On the other hand, the conductive pigment is a mineral containing conductive components such as copper, iron, lead, and zinc. Conductive materials are formed into powders. By mixing such conductive pigments, conductivity can be ensured in the coating layer 140 .

[0039] The cavity 360 is hollow inside, and the deposited film 100 - 1 forming the coating layer 140 passes through the cavity 360 .

[0040] A plurality of heaters 362 are disposed inside the chamber 360 . The plurality of heaters 362 are disposed along the traveling direction of the deposited film 100 - 1 . The heaters 362 are located above the deposited film 100 - 1 and heat the coating 140 to harden the coating 140 .

[0041] Among the multiple heaters 362 inside the cavity 360 , the heating temperature of the heater 362 located in the middle of the cavity 360 is higher than the heating temperatures of the heaters 362 located in the front and rear of the cavity 360 .

[0042] For example, the heating temperature set for the first heater 362 and the second heater 362 is about 140°C, the heating temperature set for the third heater 362 and the fourth heater 362 is about 190°C, the heating temperature set for the fifth heater 362 and the sixth heater 362 is about 195°C, and the heating temperature set for the last heater 362 is about 130°C.

[0043] Through the above operation, the coating 140 is effectively hardened under the conditions of low temperature, high temperature and low temperature in the process of passing through the cavity 360. At this time, the deposited film 100-1 passing through the cavity 360 travels at a speed of about 30 m / s, so that sufficient heat can be applied to the coating 140 within a suitable time.

[0044] S3. Steps for forming conductive yarn

[0045] like Figure 4 As shown, the coating film 100 - 2 coated with the coating layer 140 is cut into a width of 0.1 mm to 5 mm when passing through a cutting device 400 (MicroSlitting Machine), and the width can be adjusted if necessary.

[0046] In the embodiment of the present invention, the coating film 100 - 2 is cut into thin wires with a width of 0.23 mm (40 den) to prepare conductive yarns.

[0047] The cutting device 400 includes a circular blade 420 , a guide roller 440 , and a bobbin 460 .

[0048] When the coating layer 140 is formed, the rolled coating film 100 - 2 is unwound. When the coating film 100 - 2 passes through the cutting device 400 , it is cut into a plurality of equal parts by the circular blade 420 on the cutting device 400 , thereby forming thin conductive yarns.

[0049] Specifically, a coating film with a width of 1020 mm is placed on a micro-slitting machine and the film is rolled and cut into a width of 100 mm.

[0050] The film cut into 100 mm width is recorded as a roll cut film 100-3, and the roll cut film 100-3 is placed on the film support of the cutting device 400. The roll cut film 100-3 is released and passes through the guide roller and the upper and lower blades of the circular blade 420, and the roll cut film 100-3 is cut, and the gap between the circular blades 420 is the same as the width of the cut film.

[0051] In the embodiment of the present invention, the gap between the circular blades 420 is set to 0.23 mm. It is composed of 200 upper circular blades and 200 lower circular blades. 400 membrane filaments can be obtained by cutting. The winding tube 460 is provided with 400 pieces, and the membrane filament diameter is 0.23 mm (40 Den). The conductive yarn 100-4 of 40 Den is formed by winding.

[0052] On the other hand, according to the above-mentioned method for preparing the conductive yarn, the base film 100 can pass through the vacuum deposition device 200, the coating device 300 and the cutting device 400 in sequence, and can be operated uninterruptedly without disconnection. On the contrary, the vacuum deposition device 200, the coating device 300 and the cutting device 400 are each provided. Since the vacuum deposition device 200, the coating device 300 and the cutting device 400 are respectively provided, the base film 100-1 passing through the vacuum deposition device 200 is wound in a roll and supplied to the coating device 300, and the base film 100-2 passing through the coating device 300 is supplied in a roll to the cutting device 400, so that each step can be performed separately.

[0053] As described above, in the present invention, aluminum is selected as the conductive metal forming the deposition layer 120, 12mic PET is selected as the base film, and the prepared conductive yarn with a width of 0.23mm (40den) has a measured resistance value of 0.5KΩ-1KΩ (measured based on 300den yarn).

[0054] The resistance value of the conductive yarn spun by the prior art is 1000KΩ-2500KΩ (measured based on 300den yarn). Therefore, it can be seen that the resistance value of the conductive yarn prepared by the present invention is very different.

[0055] That is, the conductive yarn obtained in the present invention has very excellent conductivity.

[0056] The conductive yarn prepared by the present invention has excellent conductive properties and can be widely used in various work clothes or packaging papers required at industrial sites, as well as container covers for on-site packaging, thereby solving various problems caused by static electricity. In addition, since the conductive yarn has high conductivity, it will also have many derivative products.

Claims

1. A method for preparing a conductive yarn, characterized in that: The following steps are involved: S1, while unwinding the wound base film (100), depositing a conductive metal on the surface of the base film (100) to form a deposition layer (120); S2, forming a coating layer (140) on the surface of the base film (100) forming the deposition layer (120) using a resin mixed with a conductive pigment; S3. Cutting the base film (100) forming the coating layer (140) into conductive yarns.

2. The method for preparing the conductive yarn according to claim 1, characterized in that: The base film (100) is selected from any one of polyamide, polyethylene, oriented polypropylene, and polyethylene terephthalate; the conductive metal is selected from any one of gold, silver, copper, aluminum, bismuth, magnesium, zinc, nickel, iron, lead, and antimony; and the resin is selected from any one of epoxy resin, melamine resin, acrylic resin, polyurethane resin, and polyethylene terephthalate resin, or a combination of two or more thereof.

3. The method for preparing the conductive yarn according to claim 1, characterized in that: The deposition layer (120) is formed on both side surfaces of the base film (100).

4. The method for preparing the conductive yarn according to claim 1, characterized in that: The coating (140) is formed by spraying the resin onto the surface of the base film (100) forming the deposition layer (120), and then passing through a cavity (360) and heating with a heater (362).

5. The method for preparing the conductive yarn according to claim 4, characterized in that: The heating temperature of the heater (362) arranged in the middle of the cavity (360) is higher than the heating temperatures of the heaters (362) arranged at the front and rear of the cavity (360).

6. Application of the conductive yarn prepared by the method for preparing the conductive yarn according to any one of claims 1 to 5, characterized in that: Applicable to the field of fabric or packaging paper preparation.

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