CN110628291A - Water-based polyurethane sound-deadening coating - Google Patents
Water-based polyurethane sound-deadening coating Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2503/00—Polyurethanes
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses a water-based polyurethane sound-deadening coating, which is a two-component water-based polyurethane enamel, wherein the component A comprises the following components in parts by weight: PUA emulsion, pigment, functional filler, wetting dispersant, base material wetting agent, rheological agent, defoaming agent, thickening agent and special additive. And the component B comprises: isocyanates, alcohol ether solvents. The coating is coated on the surfaces of glass fiber and aramid fiber composite material silencing structure materials such as engines, the surface of a silencing structure is protected and decorated, the noise reduction of the whole silencing structure is improved, and the like. Coating experiments on the surfaces of composite material silencing structural materials such as engines prove that the composite material silencing structural material can be completely popularized and used in a large range, and has considerable use value and economic value.
Description
Technical Field
The invention relates to the field of functional coatings, in particular to a water-based polyurethane sound-deadening coating which is suitable for the surfaces of glass fiber and aramid fiber nonmetal composite sound-deadening structures of engines and the like, and has the advantages of short drying time, strong adhesive force, good mildew resistance, medium resistance, bending resistance, flame retardance, high and low temperature resistance, salt mist and aging resistance, sound deadening, no adverse effect on base materials and the like.
Background
In recent years, the environmental protection requirement of major developed countries in Europe and America is higher and higher, VOC emission and heavy metal consumption are limited by legislation, and water-based paint is a trend of paint development. The traditional solvent-based paint contains a large amount of organic solvents, so that the environment is polluted, fire hazards exist, and the health of constructors is seriously damaged.
At present, the adoption of a micro-perforated plate honeycomb sandwich sound absorption structure is a construction technology with the most development potential on the aspect of improving the high noise problem of an engine, and the foreign countries have high secrecy on the surface protection of the engine sound absorption structure material by using a sound absorption coating. Since the aircraft engine works in severe environments such as high temperature, high pressure, high rotation speed, large load and the like for a long time and has strict requirements on quality, volume and reliability, the requirements on the internal silencing structural material are also very strict. There are few reports on sound-damping coatings for surface protection of engine sound-damping structural materials.
The research work of the silencing coating for protecting the surface of the engine silencing structure material is first developed by the limited company of the ocean chemical research institute at home. The developed water-based polyurethane noise-damping coating is green and environment-friendly, simple and convenient to construct, excellent in performance, reliable in long-acting property and durability, comparable to solvent-based coatings in performance, and fills the gap of noise-damping coatings for protecting the surfaces of engine noise-damping structural materials in China.
Disclosure of Invention
The invention aims to provide a water-based polyurethane sound-deadening coating which is coated on the surfaces of glass fiber and aramid fiber sound-deadening structural materials of an engine and has the advantages of short drying time, strong adhesive force, good mildew resistance, medium resistance, bending resistance, flame retardance, high and low temperature resistance, salt mist and aging resistance, sound deadening, no adverse effect on a base material and the like.
The water-based polyurethane sound-damping coating comprises a component A and a component B, wherein the ratio of the component A to the component B is 10:1 (weight ratio), and the component A and the component B are respectively as follows in parts by weight:
the water-based polyurethane emulsion adopted by the invention is the synthesized organic silicon modified phosphorus-containing acrylic acid grafted polyurethane emulsion, and the common problems after the water-based resin is formed into a film are that the water resistance is poor, the medium resistance is poor, and the flame retardance and the temperature resistance are required to be improved. The solution is mainly to increase the crosslinking density of the paint film and to react or end-cap the hydrophilic groups. The self-synthesized water-based PUA emulsion containing hydroxyl, acrylic group and organosilicon group is cured by a hydrophilic polyurethane curing agent containing isocyanate group, and the isocyanate group reacts with the hydroxyl and the acid group for crosslinking; meanwhile, double bonds in the oil hydrolysate are subjected to auto-oxidation crosslinking in the presence of a drier, multiple crosslinking is carried out, the crosslinking density is improved, and the comprehensive performance is improved. The organopolysiloxane is introduced into the aqueous acrylic acid modified amino ester oil system, and can provide special properties such as high and low temperature resistance, weather resistance, aging resistance and the like. The flame retardant effect is achieved by independently adding the flame retardant, which is difficult to achieve, the resin with flame retardance is the key, the phosphate group has certain flame retardance, and the flame retardant effect can be remarkably improved by introducing the group in the synthesis. The synthesis technical route of the PUA emulsion is as follows:
1) adding double-bleaching soybean oil and pentaerythritol into a reactor, controlling the molar ratio at 1:1, introducing nitrogen, stirring, slowly heating to 120 ℃, adding 0.5% of trinonyl phenolic ester and 0.02% of calcium naphthenate, slowly heating to 250 ℃, keeping the temperature for reaction until alcoholysis is finished, wherein the alcoholysis needs 2 hours, and cooling for later use after the alcohol tolerance is qualified, wherein the acid value of the obtained product is 0.6 mgKOH/g.
2) Taking 30-35 parts of the oil hydrolysate, adding 2.0-3.0 parts of hydroxyl-containing organic silicon, 4.5-5.0 parts of dimethylolpropionic acid (DMPA) and a proper amount of N-methylpyrrolidone (NMP), introducing nitrogen, heating, stirring, completely dissolving, and cooling to 40 ℃. Adding 30-35 parts of diisocyanate (IPDI), heating to 90 ℃, carrying out heat preservation reaction for 2-3 hours until the content of NCO groups does not change any more, obtaining a prepolymer with-NCO end groups, stopping introducing nitrogen, introducing dry air, adding hydroxyethyl acrylate (HEA) and a trace amount of dibutyltin dilaurate for end capping, carrying out heat preservation reaction for 2 hours, and controlling the mass ratio of the HEA to the prepolymer with-NCO end groups to be 2: 1. Cooling the urethane oil capped by HEA to 60 ℃, adding mixed liquid of 6-8 parts of Methyl Methacrylate (MMA) and 6-8 parts of Butyl Acrylate (BA), 6-8 parts of alkyl acrylate phosphate and 2.0-3.0 parts of Triethylamine (TEA), stirring vigorously to disperse the urethane oil prepolymer uniformly, adding 140-150 parts of H2And O, continuously stirring for 30min with a large force to obtain the polyurethane aqueous dispersion liquid swelled with the acrylate monomer.
3) Heating the obtained liquid to 75 ℃, stopping introducing dry air, introducing nitrogen, reducing the stirring speed, dropwise adding 1.5 parts of NMP solution with the concentration of 50% Azobisisobutyronitrile (AIBN), controlling the dropwise adding speed, completing dropwise adding within 2-3 h, heating to 80 ℃, after 2h of heat preservation reaction, supplementing 0.5 part of NMP solution with the concentration of 50% Azobisisobutyronitrile (AIBN), heating to 85 ℃, and curing for 0.5 h.
4) Cooling the obtained emulsion to 40 ℃, adjusting the pH value of the emulsion to about 7.5 by using an aqueous solution of ammonia water, cooling, uniformly stirring, filtering and discharging.
The pigment comprises one or more of titanium dioxide, pigments with different colors of basf and Japan Mitsubishi carbon black MA 100; the functional filler is divided into a flame-retardant filler and a silencing filler, and the flame-retardant filler is one or a mixture of decabromodiphenylethane, decabromodiphenyl ether, antimony trioxide, FR707 and FR 605; the sound attenuation filler is one or a mixture of more of porous filler modified hollow glass microspheres, diatomite and kaolin; the wetting dispersant is polyacrylic copolymer potassium salt; the substrate wetting agent is polyether modified polydimethylsiloxane solution; the anti-settling agent is treated easily dispersible hectorite clay; the defoaming agent is polyether modified non-silicon surfactant; the thickening agent is nonionic waterborne polyurethane; the leveling agent is polyether modified organic silicon; the mildew preventive is a mixture of inorganic mildew preventive zinc and organic mildew preventive sulfur-containing organic matter. The isocyanate is one or a mixture of more of Bayer304, 305, 3100, 2487/1 and 2655; the alcohol ether solvent is one or a mixture of more of diethylene glycol monomethyl ether, propylene glycol methyl ether and dipropylene glycol dimethyl ether.
The water-based polyurethane sound-deadening coating comprises a component A and a component B, wherein the preparation method of the component A comprises the following steps:
and (4) material getting according to the operation instruction sheet, material weighing according to the operation instruction sheet, one-man operation and one-man rechecking. The premixing rotating speed of products with the premixing production of less than 100kg is controlled to be 500 +/-200 r/min (a low-power high-speed stirrer), the premixing rotating speed of products with the premixing production of more than 100kg is controlled to be 150 +/-50 r/min (a high-power high-speed stirrer), the stirring time is preferably sufficient and uniform, and the stirring time is about 30min generally. Grinding after pre-dispersing, and controlling the temperature of the grinding cavity of the sand mill to be less than or equal to 45 ℃ by adjusting the flow of condensed water and paying attention to the temperature change of the sand mill in the grinding process. The pressure of the feed inlet of the sand mill is adjusted to be below 2.0bar, and the feed flow is kept stable. And (4) grinding for 2-4 cycles, and cleaning the material tank after feeding according to requirements after grinding of each cycle is finished. And (4) from the 2 nd cycle, performing fineness inspection by inspectors every time the grinding is completed, stopping grinding, and otherwise, performing the next cycle until the fineness meets the requirement. Then mixing colors, carrying out factory inspection after the color difference process is qualified, filtering and packaging after the factory inspection is qualified, putting into a finished product warehouse, and marking a table for identification.
The preparation method of the component B comprises the following steps:
and (4) material getting according to the operation instruction sheet, material weighing according to the operation instruction sheet, one-man operation and one-man rechecking. The premixing rotating speed of the product below 100kg is controlled to be 250 +/-150 r/min (low-power high-speed stirrer), the premixing rotating speed of the product above 100kg is controlled to be 100 +/-50 r/min (high-power high-speed stirrer), and the stirring time is about 20 min. And then, the product is delivered for inspection, filtered and packaged after the product is qualified, and is put into a finished product warehouse and marked with an identifier.
The construction process of the water-based polyurethane sound-damping coating comprises the following steps:
firstly, treating a base material, polishing the surface of the whole glass fiber and aramid noise reduction structure material by using fine sand paper with a grain size of more than 3M320 meshes until the surface is uniform and consistent matt rough sheets, then blowing the rough sheets clean by using compressed air of an air compressor, and spraying paint within 24 hours after polishing. Before construction, the component A is stirred uniformly, and then the component A and the component B are mixed according to the proportion of 10:1, mixing and uniformly stirring, adding soft water, fully and uniformly stirring to ensure that the viscosity of a coating-4 cup is 15-30 seconds, standing and curing for 5-20 minutes, and in order to avoid the interference of impurities, filtering by using a filter screen of more than 240 meshes and then spraying, wherein the thickness of a dry film is controlled to be 35-40 mu m in a single way.
The technical indexes to be achieved by the water-based polyurethane sound-damping coating are as follows:
the developed silencing coating is coated on the surfaces of the glass fiber and aramid fiber silencing structural materials of the engine, has good adhesive force with an organic polymer base material, has good mechanical properties, heat aging resistance, chemical solvent resistance, silencing and other characteristics, has good process performance, meets the coating process requirements of the surfaces of the silencing structural materials, and specifically reaches the performance indexes shown in table 1.
TABLE 1 coating Performance requirements
Detailed Description
The invention is further illustrated by the following examples, but is in no way limited to these examples.
Example 1:
the water-based polyurethane sound-deadening coating comprises the following components in percentage by weight:
70 parts of PUA emulsion, 9308.9 parts of titanium dioxide R, 0.5 part of BASF pigment, 7.5 parts of decabromodiphenyl ether, 2.5 parts of antimony trioxide, 3 parts of modified hollow glass microspheres, 3 parts of kaolin, 0.2 part of hectorite clay, 1.0 part of polyacrylic copolymer potassium wetting dispersant, 0.2 part of polyether modified organic silicon leveling agent, 0.2 part of polyether modified polydimethylsiloxane solution base material wetting agent, 0.5 part of polyether modified non-silicon surfactant defoaming agent, 1.0 part of nonionic aqueous polyurethane thickener, 1.0 part of inorganic mildew preventive zinc and 0.5 part of organic sulfur-containing organic matter;
the component B comprises the following components in percentage by weight
265540 parts of Bayer and 60 parts of dipropylene glycol dimethyl ether.
Example 2:
the water-based polyurethane sound-deadening coating comprises the following components in percentage by weight:
70.5 parts of PUA emulsion, 9308.0 parts of titanium dioxide R, 0.4 part of BASF pigment, 7.2 parts of decabromodiphenyl oxide, 2.4 parts of antimony trioxide, 2 parts of modified hollow glass beads, 4 parts of kaolin, 0.3 part of hectorite clay, 1.2 parts of polyacrylic copolymer potassium wetting dispersant, 0.3 part of polyether modified organic silicon leveling agent, 0.1 part of polyether modified polydimethylsiloxane solution base material wetting agent, 0.4 part of polyether modified non-silicon surfactant defoaming agent, 0.8 part of nonionic aqueous polyurethane thickener, 1.6 parts of inorganic mildew preventive zinc and 0.8 part of organic sulfur-containing mildew preventive;
the component B comprises the following components in percentage by weight
265542 parts of Bayer and 58 parts of dipropylene glycol dimethyl ether.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any person skilled in the art may modify or modify the technical details disclosed above into equivalent embodiments with equivalent variations. However, any simple modification, equivalent change or modification made to the above embodiments according to the technical essence of the present invention, without departing from the technical solution of the present invention, still belongs to the protection scope of the technical solution of the present invention.
Claims (10)
1. The water-based polyurethane sound-deadening coating is characterized by being formed by combining a component A and a component B according to a weight ratio of 10:1, wherein the component A and the component B respectively comprise the following components:
。
2. the water-based polyurethane acoustical paint of claim 1, wherein the PUA emulsion is a synthetic silicone-modified phosphorus-containing acrylic graft urethane oil emulsion.
3. The water-based polyurethane acoustical coating of claim 2, wherein said PUA emulsion is prepared by the following synthetic route:
1) adding double-bleaching soybean oil and pentaerythritol into a reactor, controlling the molar ratio at 1:1, introducing nitrogen, stirring, slowly heating to 120 ℃, adding 0.5% of trinonyl phenolic ester and 0.02% of calcium naphthenate, slowly heating to 250 ℃, keeping the temperature, reacting until alcoholysis is finished, wherein the alcoholysis needs 2 hours, and cooling for later use after the alcohol tolerance is qualified, wherein the acid value of the obtained product is 0.6 mgKOH/g;
2) taking 30-35 parts of the oil hydrolysate, adding 2.0-3.0 parts of hydroxyl-containing organic silicon, 4.5-5.0 parts of dimethylolpropionic acid (DMPA) and a proper amount of N-methylpyrrolidone (NMP), introducing nitrogen, heating and stirring to completely dissolveCooling to 40 ℃ after transparence is removed. Adding 30-35 parts of diisocyanate (IPDI), heating to 90 ℃, carrying out heat preservation reaction for 2-3 hours until the content of NCO groups does not change any more, obtaining a prepolymer with-NCO end groups, stopping introducing nitrogen, introducing dry air, adding hydroxyethyl acrylate (HEA) and a trace amount of dibutyltin dilaurate for end capping, carrying out heat preservation reaction for 2 hours, and controlling the mass ratio of the HEA to the prepolymer with-NCO end groups to be 2: 1. Cooling the urethane oil capped by HEA to 60 ℃, adding mixed liquid of 6-8 parts of Methyl Methacrylate (MMA) and 6-8 parts of Butyl Acrylate (BA), 6-8 parts of alkyl acrylate phosphate and 2.0-3.0 parts of Triethylamine (TEA), stirring vigorously to disperse the urethane oil prepolymer uniformly, adding 140-150 parts of H2O, continuously stirring for 30min with a large force to obtain polyurethane aqueous dispersion swelling acrylate monomers;
3) heating the obtained liquid to 75 ℃, stopping introducing dry air, introducing nitrogen, reducing the stirring speed, dropwise adding 1.5 parts of an NMP solution with the concentration of 50% Azobisisobutyronitrile (AIBN), controlling the dropwise adding speed, completing dropwise adding within 2-3 h, heating to 80 ℃, after carrying out heat preservation reaction for 2h, supplementing 0.5 part of an NMP solution with the concentration of 50% Azobisisobutyronitrile (AIBN), heating to 85 ℃, and curing for 0.5 h;
4) cooling the obtained emulsion to 40 ℃, adjusting the pH value of the emulsion to about 7.5 by using an aqueous solution of ammonia water, cooling, uniformly stirring, filtering and discharging.
4. The water-based polyurethane sound-damping paint as claimed in claim 1, wherein the pigment is imported titanium dioxide pigment R930 or R760, pigment of each color of Basff and Mitsubishi carbon black MA100, the functional filler is flame-retardant filler and sound-damping filler, the flame-retardant filler is one or a mixture of decabromodiphenylethane, decabromodiphenyl ether, antimony trioxide, FR707 and FR 605; the noise reduction filler is a microporous filler for improving the noise reduction amount of the noise reduction coating, and is one or a mixture of more of modified hollow glass beads, diatomite and kaolin, the wetting dispersant is polyacrylic copolymer potassium salt, and the base material wetting agent is polyether modified polydimethylsiloxane solution.
5. The water-based polyurethane sound-damping paint as claimed in claim 1, wherein the anti-settling agent is a treated easily dispersible hectorite clay, the defoaming agent is a polyether-modified non-silicon surfactant, the thickening agent is nonionic aqueous polyurethane, the leveling agent is polyether-modified organosilicon, the mildewproof agent is an inorganic mildewproof agent and an organic mildewproof agent, the inorganic mildewproof agent is silver, copper and zinc metal ion antibacterial agents and metal oxides, the organic mildewproof agent is a phenolic compound, an elemental organic compound, a nitrogen-containing organic compound, a halogen-containing organic compound, a sulfur-containing organic compound and the like, and the composite mildewproof agent is a mixture of one or more of the above.
6. The water-based polyurethane sound damping coating of claim 1, wherein the isocyanate curing agent is one or a mixture of Bayer304, 305, 3100, 2487/1, and 2655.
7. The water-based polyurethane sound-damping coating material as claimed in claim 1, wherein the alcohol ether solvent is one or more of diethylene glycol monomethyl ether, propylene glycol methyl ether, and dipropylene glycol dimethyl ether.
8. The method of preparing the water-based polyurethane sound-damping paint according to claim 1, wherein the component A is prepared by the following steps:
premixing the products of which the production volume is less than 100kg at a rotation speed of 500 +/-200 r/min, premixing the products of which the production volume is more than 100kg at a rotation speed of 150 +/-50 r/min, stirring for about 30min, and grinding after pre-dispersion, wherein the temperature change of a sand mill is noticed in the grinding process, and the flow of condensed water is adjusted to control the temperature of a grinding cavity of the sand mill to be less than or equal to 45 ℃. The pressure of the feed inlet of the sand mill is adjusted to be below 2.0bar, and the feed flow is kept stable. And (4) grinding for 2-4 cycles, and cleaning the material tank after feeding according to requirements after grinding of each cycle is finished. And (4) from the 2 nd cycle, performing fineness inspection by inspectors every time the grinding is completed, stopping grinding, and otherwise, performing the next cycle until the fineness meets the requirement. Then mixing colors, carrying out factory inspection after the color difference process is qualified, filtering and packaging after the factory inspection is qualified, putting into a finished product warehouse, and marking a table identifier;
the preparation method of the component B comprises the following steps:
the premixing rotating speed of the product below 100kg is controlled at 250 + -150 r/min, the premixing rotating speed of the product above 100kg is controlled at 100 + -50 r/min, and the stirring time is about 20 min. And then, the product is delivered for inspection, filtered and packaged after the product is qualified, and is put into a finished product warehouse and marked with an identifier.
9. The water-based polyurethane sound-damping paint according to claim 1, wherein the water-based polyurethane sound-damping paint is prepared by the following steps:
firstly, treating a base material, polishing the surface of the whole glass fiber and aramid noise reduction structure material by using fine sand paper with a grain size of more than 3M320 meshes until the surface is uniform and consistent matt rough sheets, then blowing the rough sheets clean by using compressed air of an air compressor, and spraying paint within 24 hours after polishing. Before construction, the component A is stirred uniformly, and then the component A and the component B are mixed according to the proportion of 10:1, mixing and uniformly stirring, adding soft water, then fully and uniformly stirring to ensure that the viscosity of a coating-4 cup is 15-30 seconds, standing and curing for 5-20 minutes, filtering by using a filter screen with more than 240 meshes, and then spraying, wherein the thickness of a dry film is controlled to be 35-40 mu m in a single way.
10. The water-based polyurethane sound-damping coating as claimed in claim 1, which is applied to the surface of a sound-damping structure material made of a composite material of glass fiber and aramid fiber such as an engine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910924841.4A CN110628291B (en) | 2019-09-27 | 2019-09-27 | Water-based polyurethane sound-deadening coating |
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