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CN-122011448-A - Preparation method of ultra-high molecular weight polyethylene conductive composite film and conductive composite film

CN122011448ACN 122011448 ACN122011448 ACN 122011448ACN-122011448-A

Abstract

The invention discloses a preparation method of an ultra-high molecular weight polyethylene conductive composite film, which comprises the following steps of S1, mixing and dissolving ultra-high molecular weight polyethylene with the molecular weight of 500-700 ten thousand g/mol, a solvent and an antioxidant to obtain a mixed solution, S2, sending the mixed solution into a double-screw extruder to obtain a melt, cooling the melt into a gel sheet through a cooling roller, S3, carrying out preliminary biaxial stretching on the gel sheet, sequentially carrying out extraction, drying and annealing to obtain an embryo film, S4, carrying out biaxial stretching on the dried embryo film again to obtain a base film, S5, coating at least one surface of the base film with a nano silver wire coating solution, and heating to form a film to obtain the conductive composite film with a flexible conductive layer, wherein the mass ratio of the ultra-high molecular weight polyethylene to the solvent is (5-10) to (90-95). The thermal stability of the base film and the size retention of the pores are optimized by the process, so that the connection firmness with the conductive layer is improved, and the conductive performance is optimized. A conductive composite film is also disclosed.

Inventors

  • JI QIANG
  • ZHANG XIAOPING

Assignees

  • 江阴市彩虹塑业有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. The preparation method of the ultra-high molecular weight polyethylene conductive composite film is characterized by comprising the following steps of: S1, mixing and dissolving ultra-high molecular weight polyethylene with the molecular weight of 500-700 ten thousand g/mol, a solvent and an antioxidant to obtain a mixed solution; s2, feeding the mixed solution into a double-screw extruder to obtain a melt, and cooling the melt into a gel sheet through a cooling roller; s3, carrying out preliminary biaxial stretching on the gel sheet, and sequentially carrying out extraction, drying and annealing to obtain an embryo membrane; S4, performing biaxial stretching on the dried embryo membrane again to obtain a base membrane; s5, coating a nano silver wire coating liquid on at least one surface of the base film, and heating to form a film to obtain a conductive composite film with a flexible conductive layer; the mass ratio of the ultra-high molecular weight polyethylene to the solvent is (5-10) to (90-95).
  2. 2. The preparation method of the ultra-high molecular weight polyethylene conductive composite film according to claim 1, wherein the nano silver wire coating liquid comprises modified nano silver wires, diacetone alcohol and deionized water, wherein the nano silver wires are dissolved in the deionized water to form nano silver dispersion liquid with the concentration of 5-10 g/L, and the addition amount of the diacetone alcohol is 0.06% -0.09% of the nano silver dispersion liquid.
  3. 3. The preparation method of the ultra-high molecular weight polyethylene conductive composite film according to claim 2 is characterized by comprising the steps of preheating 10mL of ethylene glycol to 160-170 ℃, adding 2.5mL of 0.008g/10mL of seed crystal inducer copper chloride ethylene glycol solution into the solution to obtain an induction solution, mixing 0.1g/10mL of AgNO 3 ethylene glycol solution and 0.3g/10mL of stabilizer polyvinylpyrrolidone ethylene glycol solution, taking 10mL of the solution, slowly adding the induction solution to obtain a nano silver wire suspension, reacting for 20-30 min, carrying out centrifugal separation on the suspension, washing and purifying sequentially by using acetone, distilled water and absolute ethyl alcohol to obtain nano silver wire blanks, and immersing the nano silver wire blanks in 0.3-0.5 mol/L of surface treatment agent glutaric acid ethanol solution for 15-20 min to remove the surface treatment agent to obtain the modified nano silver wire.
  4. 4. The method for preparing an ultra-high molecular weight polyethylene conductive composite film according to claim 1, wherein in S3, the preliminary biaxial stretching is asynchronous biaxial stretching in the longitudinal direction and then in the transverse direction, the longitudinal stretching magnification is n, n is 4-6, the transverse stretching magnification is m, m is 4-8, and 1-m/n is 1.35.
  5. 5. The method for preparing a conductive composite film of ultra-high molecular weight polyethylene according to claim 4, wherein in the step S4, the re-biaxial stretching comprises a first biaxial stretching step and a second biaxial stretching step, wherein the first biaxial stretching step and the second biaxial stretching step are asynchronous biaxial stretching steps of longitudinal direction and transverse direction, the longitudinal stretching multiplying power of the first biaxial stretching step is a, a is less than or equal to 2 and less than or equal to 3, the transverse stretching multiplying power is b, b is less than or equal to 1 and less than or equal to 2 and b is less than or equal to a, the longitudinal stretching multiplying power of the second biaxial stretching step is x, x is less than or equal to 1 and less than or equal to 2, the transverse stretching multiplying power is y, y is less than or equal to 1 and less than or equal to 2, and y is less than or equal to x.
  6. 6. The method for preparing an ultra-high molecular weight polyethylene conductive composite film according to claim 5, wherein the stretching temperature of the preliminary biaxial stretching is 115-120 ℃, the stretching temperature of the first biaxial stretching in the second biaxial stretching is 130-135 ℃, and the stretching temperature of the second biaxial stretching is 135-140 ℃.
  7. 7. The method for preparing an ultra-high molecular weight polyethylene conductive composite film according to claim 1, wherein in S3, the drying temperature is 65-75 ℃ and the annealing temperature is 105-110 ℃.
  8. 8. The method for preparing an ultrahigh molecular weight polyethylene conductive composite film according to claim 1, wherein in S5, the heating temperature of the base film is 140-150 ℃.
  9. 9. The preparation method of the ultra-high molecular weight polyethylene conductive composite film according to claim 1 is characterized in that the antioxidant is antioxidant 1010, the addition amount is 0.5% -1% of the total mass of the ultra-high molecular weight polyethylene and the solvent, the solvent is white oil, and the diluent is n-hexane.
  10. 10. A conductive composite film, characterized in that it is produced by the method for producing an ultra-high molecular weight polyethylene conductive composite film according to any one of claims 1 to 9.

Description

Preparation method of ultra-high molecular weight polyethylene conductive composite film and conductive composite film Technical Field The invention relates to the technical field of polymer nano composite materials, in particular to a preparation method of an ultra-high molecular weight polyethylene conductive composite film and the conductive composite film. Background Flexible transparent electrodes, gas permeable electrodes or water permeable electrodes are important required materials in various fields, wherein the flexible transparent electrodes are applied to the fields of OLEDs, solar cells or flexible sensing devices, etc., and the gas permeable electrodes or water permeable electrodes are used as reactors in the fields of photocatalysis or electrocatalysis. For transparent electrode materials, indium Tin Oxide (ITO), carbon nanotubes, graphene, metal mesh, and the like are most commonly used at present. ITO can realize high transparency and high conductivity, but ITO materials have high brittleness and cannot meet the application requirements of flexible electronic equipment, while carbon materials have high mechanical strength and conductivity, and are difficult to realize conductivity and transparency at the same time due to the dependence on the conduction mode of conjugated electrons, and metal net materials can realize good conductivity, light transmittance and stable mechanical properties through the regulation and control of a pore structure, however, the processing technology of the pore structure is complex. Disclosure of Invention The invention aims to overcome the defects in the prior art, provides a preparation method of an ultra-high molecular weight polyethylene conductive composite film, and aims to improve the conductive performance of the ultra-high molecular weight polyethylene conductive composite film by reducing the film thickness of a base film through biaxial stretching before and after extraction of a gel sheet, optimize the thermal stability of the reduced base film and the size retention of pores of the base film by combining an annealing process, ensure the mechanical strength and the air permeability of the base film, and facilitate the improvement of the thermal connection firmness of a conductive layer and the base film, thereby optimizing the conductive performance and the conductive stability of the composite film. In order to realize the technical effects, the technical scheme of the invention is that the preparation method of the ultra-high molecular weight polyethylene conductive composite film comprises the following steps: S1, mixing and dissolving ultra-high molecular weight polyethylene with the molecular weight of 500-700 ten thousand g/mol, a solvent and an antioxidant to obtain a mixed solution; s2, feeding the mixed solution into a double-screw extruder to obtain a melt, and cooling the melt into a gel sheet through a cooling roller; s3, carrying out preliminary biaxial stretching on the gel sheet, and sequentially carrying out extraction, drying and annealing to obtain an embryo membrane; S4, performing biaxial stretching on the dried embryo membrane again to obtain a base membrane; s5, coating a nano silver wire coating liquid on at least one surface of the base film, and heating to form a film to obtain a conductive composite film with a flexible conductive layer; the mass ratio of the ultra-high molecular weight polyethylene to the solvent is (5-10) to (90-95). According to the preferable technical scheme, the nano silver wire coating liquid comprises modified nano silver wires, diacetone alcohol and deionized water, wherein the nano silver wires are dissolved in the deionized water to form 5-10 g/L nano silver dispersion liquid, and the addition amount of the diacetone alcohol is 0.06% -0.09% of the nano silver dispersion liquid. The preparation method of the modified nano silver wire comprises the steps of preheating 10mL of ethylene glycol to 160-170 ℃, adding 2.5mL of seed crystal inducer copper chloride ethylene glycol solution of 0.008g/10mL to dissolve to obtain an induction solution, mixing 0.1g/10mL of AgNO 3 ethylene glycol solution and 0.3g/10mL of stabilizer polyvinylpyrrolidone ethylene glycol solution, slowly adding 10mL of induction solution to obtain a nano silver wire suspension, reacting for 20-30 min, carrying out centrifugal separation on the suspension, washing and purifying sequentially by using acetone, distilled water and absolute ethyl alcohol to obtain a nano silver wire blank, soaking the nano silver wire blank in a surface treatment agent glutaric acid ethanol solution of 0.3-0.5 mol/L for 15-20 min, and removing the surface treatment agent to obtain the modified nano silver wire. In the preferred technical scheme, in the step S3, the preliminary biaxial stretching is firstly longitudinal and then transverse asynchronous biaxial stretching, the longitudinal stretching multiplying power is n, n is more than or equal to 4 and