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In order to reduce the blurred phenomenon of water vapor scattering on the light, this theory uses a large numbe
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Embodiment 1
[0033] The coating agent of the polyurethane emulsion copolymer coating 2 containing hemp stalk core superfine powder comprises the raw materials of following percentage by weight and evenly stirs to make:
[0034] Polyurethane 20%;
[0035] Dimethylformamide solvent 55%;
[0036] Hydrophilic group solvent 2%;
[0037] Hemp Stalk Core Superfine Powder 18%.
[0038] Wherein, the thickness of the polyurethane emulsion copolymer coating 2 containing the superfine powder of hemp stalk core is 0.012 mm.
[0039] The viscosity index of the coating agent is 33 Pa.s. The coating agent contained 35% non-volatile matter.
Embodiment 2
[0041] The coating agent of the polyurethane emulsion copolymer coating 2 containing hemp stalk core superfine powder comprises the raw materials of following percentage by weight and evenly stirs to make:
[0042] Polyurethane 23%;
[0043] Dimethylformamide solvent 57%;
[0044] Hydrophilic group solvent 4%;
[0045] Hemp Stalk Core Superfine Powder 21%.
[0046] Wherein, the thickness of the polyurethane emulsion copolymer coating 2 containing the hemp stalk core superfine powder is 0.0185mm.
[0047] The viscosity index of the coating agent is 33 Pa.s. The coating agent contains 40% non-volatile matter.
Embodiment 3
[0049] The coating agent of the polyurethane emulsion copolymer coating 2 containing hemp stalk core superfine powder comprises the raw materials of following percentage by weight and evenly stirs to make:
[0054] Wherein, the thickness of the polyurethane emulsion copolymer coating 2 containing the superfine powder of hemp stalk core is 0.025mm.
[0055] The viscosity index of the coating agent is 33 Pa.s. The coating agent contains 45% non-volatile matter.
[0056] In Examples 1-3, the manufacturing process of the hemp stalk core superfine powder includes: first processing the hemp stalk core into a coarse powder, and performing pretreatment, followed by refinement treatment and activation treatment, and drying after the treatment is completed. dry, then carry out modification treatment, then carry out microniza...
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Abstract
The invention discloses a coating film with the large moisture permeability. The coating film comprises a basic film layer and a coating layer, wherein the basic film layer is an expanded polytetrafluoroethylene film layer; the coating layer coating the expanded polytetrafluoroethylene film layer is a polyurethane emulsion copolymerization coating layer containing superfine micro-powder of hemp stalk cores; a coating agent of the polyurethane emulsion copolymerization coating layer containing the superfine micro-powder of the hemp stalk cores is prepared by uniformly stirring the following raw materials in percentage by weight: 20-25% of polyurethane; 55-60% of a dimethylfomamide solvent; 2-5% of a hydrophilic group solvent and 18-25% of the superfine micro-powder of the hemp stalk cores. Through the manner, the coating film has good moisture absorbing and guide performances; the content of moisture permeable factor fibrin in the superfine micro-powder of the hemp stalk cores is large; micro-grooves and micropores exist in the coasting film, so that the moisture absorption area and the diffusion area are increased; the coating film has excellent performances such as ultraviolet resistance, water proofing, dust proofing, oil proofing, moisture permeability and corrosion resistance on oxide solutions.
Description
technical field [0001] The invention relates to a coating film with high moisture permeability. Background technique [0002] In the prior art, the air vent hole of the European car lamp has the theory of fog and dew condensation removal, and there is a sponge dustproof inside, and the air in the lamp can be moved in and out with the change of the temperature in the lamp, so that the lamp can be realized quickly. Disperse the fog inside to remove condensation, and the ventilated car lights with bent tubes will accumulate dust in the housing and corrode the electrical components soon after use. [0003] The dew condensation theory of Gore Company in the United States: the lamp is through the air convection inside the lamp and the outside of the lamp to establish a kind of air pressure balance. The water vapor in the lamp will be discharged outside the lamp as the temperature inside the lamp rises. The larger air-permeable membrane patch method realizes mist removal and dew c...
Claims
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