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JP-2026075256-A - Conductive flame-retardant moisture-permeable film

JP2026075256AJP 2026075256 AJP2026075256 AJP 2026075256AJP-2026075256-A

Abstract

[Problem] To provide a conductive, flame-retardant, and breathable film. [Solution] The conductive flame-retardant moisture-permeable film of the present invention has a small number of layers of graphene with a solid content of 30 to 70 wt% and a polyrotaxane with a solid content of at least 15 wt% added to a polyurethane resin. The polyrotaxane contains linear polymers and cyclic molecular compounds, and the cyclic molecules of the polyrotaxane are further surface-modified with a halogen-free flame-retardant polymer material. In this way, the flame retardancy and flexibility of the polyurethane are enhanced by adding the modified polyrotaxane, and the conductivity is improved by simultaneously increasing the amount of graphene added. [Selection Diagram] Figure 1

Inventors

  • ▲呉▼定宇
  • 李山

Assignees

  • 宇興▲たん▼素股▲ふん▼有限公司

Dates

Publication Date
20260508
Application Date
20241022

Claims (10)

  1. A conductive, flame-retardant, and breathable film characterized by the addition of a small number of layer graphene with a solid content of 30-70 wt% and a polyrotaxane with a solid content of at least 15 wt% to a polyurethane resin, wherein the polyrotaxane comprises a compound of linear polymers and cyclic molecules, and the cyclic molecules of the polyrotaxane are further surface-modified with a halogen-free flame-retardant polymer material.
  2. The conductive flame-retardant, moisture-permeable film according to claim 1 is characterized by having a thickness of 30 to 50 μm and a basis weight in the range of 35 gsm to 60 gsm, a surface electrical resistance measured according to the JIS K-7194 method being at least ≤10² Ω/sq, a moisture permeability measured according to the JIS L1099 B-1 standard being at least 30,000 g/ m² /24h, a water pressure resistance value measured according to the JIS L1092 B-2009 standard being at least 10,000 mmH²O , flame retardancy as defined by the flame retardancy test of FAR 25.853, and a power loss % of at least 30% in the test range of electromagnetic wave frequencies from 0.5 GHz to 12 GHz.
  3. The conductive flame-retardant, moisture-permeable film according to claim 1, characterized in that the few-layer graphene has a solid content in the range of 50 to 60 wt%, and the halogen-free flame-retardant polymer material is a low molecular weight polymer material containing phosphate groups, with a phosphorus content of more than 10%.
  4. The conductive flame-retardant moisture-permeable film according to claim 1, characterized in that the polyurethane resin has a moisture permeability of at least 100,000 g/ m² /24h as measured according to JIS L1099 B-1, the weight-average molecular weight of the polyrotaxane is more than 100,000 and less than 500,000, at least 95% of the minority layer graphene has a transverse size of 1,000 to 30,000 nm and a thickness of 0.34 to 7 nm, the oxygen content of the minority layer graphene is at least less than 0.1%, and the aspect ratio of the minority layer graphene is in the range of 200 to 400.
  5. The conductive, flame-retardant, and moisture-permeable film according to claim 4, characterized in that at least 50% of the minority layer graphene has a transverse size of 6000 to 8000 nm and a thickness of 2 to 3 nm.
  6. The conductive, flame-retardant, and moisture-permeable film according to claim 1, characterized in that the linear polymer is the axial molecule in the compound, has a molecular weight exceeding 10,000, and is chemically modified by an end-capping group, and the cyclic molecule has at least one reactive group capable of passing through the linear polymer and generating a crosslinking reaction with the reactive groups of the polyurethane resin.
  7. The conductive, flame-retardant, and moisture-permeable film according to claim 6, characterized in that the main chain polymer of the linear polymer comprises copolymers such as polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, polypropylene glycol, polyvinylacetaldehyde resin, polydimethylsiloxane, polyamine, polyethyleneimine, polyolefin, polyester, polyvinyl chloride, polystyrene, acrylonitrile-styrene copolymer, or derivatives thereof; the end-capping group comprises dinitrophenyl, adamantane, or triphenylmethyl; and the cyclic molecule comprises a calixarene compound, cryptand compound, cyclic aromatic compound, macrocyclic amine compound, crown ether compound, or cyclodextrin compound.
  8. The conductive, flame-retardant, and breathable film according to claim 7, characterized in that the linear polymer is a linear polymer based on polyethylene glycol, and the cyclic molecule is a cyclodextrin, or a substituted cyclodextrin, or a substituted cyclodextrin compound in which the reactive group is further introduced to the substituted cyclodextrin.
  9. The conductive, flame-retardant, and moisture-permeable film according to claim 8, characterized in that the reactive group introduced into the cyclic molecule includes a hydroxyl group, a carboxyl group, an allyl group, a methacrylic acid group, an epoxy group, or a vinyl group.
  10. The conductive, flame-retardant, and moisture-permeable film according to claim 6, characterized in that the reactive groups of the polyurethane resin include carbonyl groups, amine groups, hydroxyl groups, and epoxy groups.

Description

This invention relates to a conductive, flame-retardant, and breathable film, and more specifically, to a conductive, flame-retardant, and breathable film in which the flame retardancy and flexibility of polyurethane are improved by adding modified polyrotaxane, while simultaneously increasing the amount of graphene added. Polyurethane molecules contain numerous hydrogen bonds, resulting in strong intermolecular forces and excellent adhesion. Furthermore, their stable chemical properties and ease of forming waterproof and breathable films make them widely used in fabric coating technology. Fabrics coated with waterproof and breathable films are now standard in commercially available outdoor climbing jackets, snow jackets, and related products. Many waterproof and breathable film-coated fabrics emphasize high breathability and waterproofing, protecting wearers from heavy rain during outdoor sports. The film's high breathability allows for smooth wicking of moisture from the body's surface, reducing discomfort from overheating. Workwear used in certain specialized work environments, such as firefighting suits, cleanroom suits, medical suits, or military/police uniforms, requires high conductivity in addition to the aforementioned breathability and waterproofing properties. This is necessary to prevent harm to the wearer from static electricity buildup and electromagnetic signal reflection in the work environment. This is a schematic diagram showing the preparation and molding process according to one embodiment of the present invention.This is a cross-sectional image (1000x magnification) showing a conductive, flame-retardant, and moisture-permeable film prepared and molded according to one embodiment of the present invention.This is a cross-sectional image (5000x magnification) showing a conductive, flame-retardant, and moisture-permeable film prepared and molded according to one embodiment of the present invention. Embodiments of the present invention will be described in detail. However, the present invention is not limited thereto, and various modifications are possible within the scope described. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included within the technical scope of the present invention. The preparation process of the present invention will be described in detail below with reference to Figure 1. a1. A high-concentration graphene dispersion paste is prepared, comprising a small number of layers of graphene having a solid content of 30-70 wt%, at least 95% of which has a lateral size of 6000 nm-8000 nm and a thickness of 2-3 nm, an aspect ratio in the range of 200-400, and an oxygen content of at least less than 0.1%, a surfactant, and a solvent, with a liquid viscosity in the range of 1000-3000 cps. The characteristics of the high-concentration graphene dispersion paste include: 1) after being left for a certain period of time, the difference in the concentration distribution of the paste is less than 20%, and 2) after undergoing a fixed-weight dispersion process, the difference in the concentration distribution of the paste is less than 5%. a2. A polyrotaxane mixed solution is formed by adding a suitable dispersion solvent to the polyrotaxane at an appropriate temperature and atmosphere. A quantitative amount of halogen-free flame-retardant polymer material is then added in portions to the fluid paste and uniformly stirred to prepare a flame-retardant modified polyrotaxane fluid. The polyrotaxane contains linear polymers and cyclic molecular compounds. The linear polymer is the axial molecule in the compound, has a molecular weight exceeding 10,000, and is characterized by only being chemically modified by end-capping groups. The cyclic molecule refers to a cyclic molecule capable of permeating the polymer, and is sufficient if it has at least one reactive group capable of reacting with the halogen-free flame-retardant polymer material. The halogen-free flame-retardant polymer material is a low molecular weight polymer material containing phosphate groups, and its phosphorus content must exceed 10%. b. A high-concentration graphene-dispersed paste is rapidly polished and sheared to disperse it, reducing the difference in the concentration distribution of the paste to less than 5%. Furthermore, the fluid paste is divided, a quantitative amount of flame-retardant modified polyrotaxane fluid is added, and the mixture is uniformly mixed while accelerating the shear mixing action, forming a graphene-polyrotaxane composite fluid with a viscosity in the range of 5000 to 10000 cps and a paste particle size distribution D90 of less than 15 μm. c. A graphene-polyrotaxane-polyurethane composite coating solution is formed by using a graphene-polyrotaxane composite fluid as the base material, adding a polyurethane resin fluid in a flowing state in divided portions, and uniformly mixing it while stimulating shear mixing action, thereby f