CN107793912B - Rain erosion resistant coating for aircraft engine reverse thrust outer shell and preparation thereof - Google Patents
Rain erosion resistant coating for aircraft engine reverse thrust outer shell and preparation thereof Download PDFInfo
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- CN107793912B CN107793912B CN201711096176.1A CN201711096176A CN107793912B CN 107793912 B CN107793912 B CN 107793912B CN 201711096176 A CN201711096176 A CN 201711096176A CN 107793912 B CN107793912 B CN 107793912B
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- C—CHEMISTRY; METALLURGY
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/06—Polyurethanes from polyesters
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- C—CHEMISTRY; METALLURGY
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/12—Polyurethanes from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group
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- C—CHEMISTRY; METALLURGY
- 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
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts
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- Polyurethanes Or Polyureas (AREA)
Abstract
The invention relates to a rain erosion resistant coating for protecting a reverse thrust outer shell of an aircraft engine made of a composite material, which consists of a component A and a component B, wherein the component A is formed by mixing hydroxy-containing amino acid ester resin, pigment, filler, a dispersing agent, a defoaming agent, a leveling agent, a solvent and the like and then grinding the mixture by using grinding equipment, the component B is a prepolymer containing-NCO groups, and the amino acid ester resin in the component A comprises cycloaliphatic amine, a monoepoxy compound and a solvent. The coating prepared from the coating has good properties of rain erosion resistance, sand dust resistance, aging resistance, elongation, tensile strength and the like.
Description
Technical Field
The invention relates to a rain erosion resistant coating for an aircraft engine reverse thrust outer casing.
Background
With the development of the national defense industry, the aircraft engine is also developed as the heart of the aircraft, the protection of the aircraft engine also puts forward higher requirements, the reverse thrust outer shell is a protective umbrella for resisting the engine from the external environment, and the reverse thrust outer shell is made of composite materials and is particularly important to protect the reverse thrust outer shell.
The reverse-thrust outer shell of the aircraft engine is subjected to strong air scouring in flying and landing, and the air contains more corrosive friction objects such as sand dust, salt mist and the like, so that the long-acting protection of the aircraft engine is particularly important.
The aircraft engine reverse-thrust outer shell made of the composite material is flushed by gravel, salt mist and the like during flying due to the fact that the flying environment is the marine atmospheric environment, and long-acting protection on the aircraft engine reverse-thrust outer shell is particularly important. The existing protective coating for the engine reverse-thrust outer shell is a rain erosion resistant coating developed in the seventy-eight years of the last century, is an aromatic polyurethane coating, has good protective property, but has poor performances such as aging resistance, yellowing resistance, salt mist resistance and the like, and cannot provide long-acting protection for the engine reverse-thrust outer shell.
Disclosure of Invention
The invention aims to develop a long-acting protective aliphatic polyurethane rain erosion resistant coating aiming at the use requirement of a thrust reversal outer shell of an aircraft engine in a marine atmospheric environment, and the prepared coating has good rain erosion resistance, weather resistance, sand dust resistance and high elasticity while solving the problems of aging resistance, yellowing resistance and the like of the original coating.
The rain erosion resistant coating consists of a component A and a component B, wherein the component A is formed by mixing hydroxyl-containing amino acid ester resin, pigment, filler, a dispersing agent, a defoaming agent, a leveling agent, a solvent and the like and then grinding the mixture by using grinding equipment; the component B is a prepolymer containing-NCO groups. The aircraft engine reverse-thrust shell rain erosion resistant coating comprises 45-55% of the component A and 60-70% of the component B by mass solid content.
The formula of the component A comprises the following components in percentage by mass:
the pigment is at least one of titanium dioxide, carbon black and chromium oxide green.
The filler is at least one of mica powder, talcum powder, fumed silica and wax powder.
The dispersant is at least one of BYK-110, BYK-104S, BYK-P104S and BYK-163.
The defoaming agent is at least one of BYK-054, BYK-052 and BYK-066N.
The leveling agent is at least one of BYK-378, BYK-320 and Levelol-837.
The solvent is at least one of butyl acetate, propylene glycol methyl ether acetate, cyclohexanone and xylene.
The formula of the amino acid ester resin in the component A comprises the following components in percentage by mass:
20 to 35 percent of cycloaliphatic amine
50 to 60 percent of monoepoxy compound
15 to 25 percent of solvent
The cycloaliphatic amine is at least one of 3,3 '-dimethyl-4, 4-diaminodicyclohexyl methane (MACM) and 4,4' -diaminodicyclohexyl methane.
The monoepoxy compound is at least one of butyl glycidyl ether, tertiary carbonic acid glycidyl ester, isooctyl glycidyl ether or gamma- (2, 3-epoxypropane) propyl trimethoxy silane.
Gamma- (2, 3-epoxypropane) propyl trimethoxy silane is adopted, and the gamma- (2, 3-epoxypropane) propyl trimethoxy silane greatly contributes to the reaction crosslinking density and the adhesive force.
3,3' -dimethyl-4, 4-diaminodicyclohexyl methane (MACM) is used as the main chain of the amino acid ester resin, and the wetting property to pigments and fillers is better, so that the rain erosion resistance of the coating is better.
The solvent is the same as that in component A.
The preparation method of the amino acid ester resin comprises the following steps: and uniformly stirring the cycloaliphatic amine, the monoepoxy compound and the solvent, heating to 120-130 ℃, reacting for 2-3 h, and cooling to obtain the amino acid ester resin.
The preparation method of the component A comprises the following steps: and (2) sequentially adding a dispersing agent, a flatting agent, a defoaming agent, a pigment and a filler into the self-made amino acid ester resin, grinding until the fineness is less than 30 mu m, filtering and discharging to obtain a component A, wherein the mass solid content of the component A is 45-55%.
In conclusion, the invention utilizes the reaction of the cyclic ester amine and the compound containing the epoxy group to generate the amino acid ester resin containing the hydroxyl group, the resin does not contain double bonds and is not easy to yellow, the resin has great contribution to the wettability and the anti-settling property of pigment and filler, and a silicon monomer is introduced, so that the resin has great contribution to the crosslinking density, the adhesive force with a base material and the weather resistance of the coating.
The formula of the component B comprises the following components in percentage by mass:
the hydroxyl-containing polyester resin is 89# resin produced by northern paint institute, the molecular weight is 1000-1500, and the mass solid content is 80-100%.
The polyalcohol is at least one of trimethylolpropane, 1, 4-butanediol and neopentyl glycol.
The polyisocyanate is at least one of IPDI and HDI.
The solvent is at least one of cyclohexanone, acetone, xylene, ethyl acetate and butyl acetate.
The preparation process of the component B comprises the following steps: adding hydroxyl-containing polyester resin, polyalcohol and a solvent into a reaction bottle, heating to reflux under stirring, cooling to 70 +/-5 ℃ after refluxing and dehydrating for 1h, adding isocyanate, carrying out heat preservation reaction for 1h at 70 ℃, carrying out heat preservation reaction for 1h at 80 ℃, carrying out heat preservation reaction for 4h at 95 ℃, and measuring the NCO content to be 2.5-5% and the mass solid content to be 60-70%.
And (3) preparing the component A and the component B into a coating according to the mass ratio of 1.3:1, and performing construction.
The invention relates to a rain erosion resistant coating for protecting a thrust reversal outer shell of an aircraft engine made of a composite material, and the coating prepared from the coating has good properties of rain erosion resistance, sand dust resistance, aging resistance, elongation, tensile strength and the like.
Detailed Description
Example 1
(1) Uniformly stirring 200g of 4,4' -diaminodicyclohexylmethane, 449g of tert-carbonic acid glycidyl ester and xylene, heating to 120-130 ℃, reacting for 2-3 h, cooling, filtering and discharging to obtain the amino acid ester resin with the mass solid content of 82 +/-2%.
(2) Uniformly stirring 500g of amino acid ester resin and 880g of butyl acetate, sequentially adding 8g of dispersant BYK-P104S, 6g of leveling agent Levelol-837, 3g of defoaming agent BYK-054, 240g of titanium dioxide, 134g of fumed silica and 105g of wax powder, grinding until the fineness is less than 30 mu m, filtering and discharging to obtain a component A, wherein the mass solid content is 50 +/-5%.
(3) The preparation method of the component B comprises the following steps: 160g of hydroxyl-containing polyester resin (89# resin), 8g of trimethylolpropane and 106g of butyl acetate are added into a reaction bottle, the mixture is heated to reflux under stirring, the reflux is dehydrated for 1h, the temperature is reduced to 70 +/-5 ℃, 72g of isophorone diisocyanate is added, the mixture is subjected to heat preservation reaction at 70 ℃ for 1h, the mixture is subjected to heat preservation reaction at 80 ℃ for 1h, the mixture is subjected to heat preservation reaction at 95 ℃ for 4h, the measured NCO content is 2.2-5.0%, and the mass solid content is 60% -70%.
Example 2
(1) Uniformly stirring 200g of 4,4' -diaminodicyclohexylmethane, 238g of glycidyl versatate, 224g of gamma- (2, 3-epoxypropane) propyl trimethoxy silane and xylene, heating to 120-130 ℃, reacting for 2-3 h, cooling, filtering and discharging to obtain the amino acid ester resin with the mass solid content of 82 +/-2%.
(2) Uniformly stirring 500g of amino acid ester resin and 880g of butyl acetate, sequentially adding 8g of dispersant BYK-P104S, 6g of leveling agent Levelol-837, 3g of defoaming agent BYK-054, 240g of titanium dioxide, 134g of fumed silica and 105g of wax powder, grinding until the fineness is less than 30 mu m, filtering and discharging to obtain a component A, wherein the mass solid content is 50 +/-5%.
(3) The preparation method of the component B comprises the following steps: 160g of hydroxyl polyester resin (89# resin), 8g of trimethylolpropane and 106g of butyl acetate are added into a reaction bottle, the temperature is raised to reflux while stirring, the reflux is dehydrated for 1h, the temperature is reduced to 70 +/-5 ℃, 72g of isophorone diisocyanate is added, the reaction is carried out at 70 ℃ for 1h, the reaction is carried out at 80 ℃ for 1h, the reaction is carried out at 95 ℃ for 4h, the measured NCO% content is 2.2-5.0%, and the mass solid content is 60% -70%.
Example 3
(1) 200g of 3,3' -dimethyl-4, 4-diaminodicyclohexyl methane (MACM), 109g of butyl glycidyl ether, 198g of gamma- (2, 3-epoxypropane) propyl trimethoxy silane and xylene are uniformly stirred, heated to 120-130 ℃ for reaction for 2-3 h, cooled, filtered and discharged to obtain the amino-acid ester resin with the mass solid content of 82 +/-2%.
(2) Uniformly stirring 500g of amino acid ester resin and 880g of butyl acetate, sequentially adding 8g of dispersant BYK-P104S, 6g of leveling agent Levelol-837, 3g of defoaming agent BYK-054, 240g of titanium dioxide, 134g of fumed silica and 105g of wax powder, grinding until the fineness is less than 30 mu m, filtering and discharging to obtain a component A, wherein the mass solid content is 50 +/-5%.
(3) The preparation method of the component B comprises the following steps: 160g of hydroxyl-containing polyester resin (89# resin), 8g of trimethylolpropane and 106g of butyl acetate are added into a reaction bottle, the mixture is heated to reflux under stirring, the reflux is dehydrated for 1h, the temperature is reduced to 70 +/-5 ℃, 72g of isophorone diisocyanate is added, the mixture is subjected to heat preservation reaction at 70 ℃ for 1h, the mixture is subjected to heat preservation reaction at 80 ℃ for 1h, the mixture is subjected to heat preservation reaction at 95 ℃ for 4h, the measured NCO content is 2.2-5.0%, and the mass solid content is 60-70%.
Example 4
(1) 200g of 3,3' -dimethyl-4, 4-diaminodicyclohexyl methane (MACM), 210g of tertiary carbonic acid glycidyl ester, 198g of gamma- (2, 3-epoxypropane) propyl trimethoxy silane and xylene are uniformly stirred, heated to 120-130 ℃ for reaction for 2-3 h, cooled, filtered and discharged to obtain the amino acid ester resin with the mass solid content of 82 +/-2%.
(2) 500g of amino acid ester resin and 880g of butyl acetate are stirred uniformly under stirring, 8g of dispersant BYK-P104S, 6g of leveling agent Levelol-837, 3g of defoamer BYK-054, 240g of titanium dioxide, 134g of fumed silica and 105g of wax powder are sequentially added into the mixture, the mixture is ground until the fineness is less than 30 mu m, and the mixture is filtered and discharged to obtain a component A with the mass solid content of 50 +/-5%.
(3) The preparation method of the component B comprises the following steps: 160g of hydroxyl-containing polyester resin (89# resin from northern paint institute), 8g of trimethylolpropane and 106g of butyl acetate are added into a reaction bottle, the mixture is heated to reflux under stirring, the temperature is reduced to 70 +/-5 ℃ after the reflux dehydration is carried out for 1h, 72g of isophorone diisocyanate is added, the reaction is carried out at the temperature of 70 ℃ for 1h, the reaction is carried out at the temperature of 80 ℃ for 1h, the reaction is carried out at the temperature of 95 ℃ for 4h, the measured NCO% content is 2.2-5.0%, and the mass solid content is 60% -70%.
Example 5
(1) 200g of 3,3 '-dimethyl-4, 4' -diaminocyclohexylmethane, 210g of tertiary carbonic acid glycidyl ester, 198g of gamma- (2, 3-epoxypropane) propyl trimethoxy silane and xylene are stirred uniformly, the temperature is increased to 120-130 ℃, reaction is carried out for 2-3 h, the temperature is reduced, and the materials are filtered and discharged, namely the amino acid ester resin, wherein the mass solid content is 82 +/-2%.
(2) 500g of amino acid ester resin and 880g of butyl acetate are stirred uniformly under stirring, 8g of dispersant BYK-P104S, 6g of leveling agent Levelol-837, 3g of defoamer BYK-054, 240g of titanium dioxide, 134g of fumed silica and 105g of wax powder are sequentially added into the mixture, the mixture is ground until the fineness is less than 30 mu m, and the mixture is filtered and discharged to obtain a component A with the mass solid content of 50 +/-5%.
(3) The preparation method of the component B comprises the following steps: 160g of hydroxyl-containing polyester resin (89# resin from northern paint institute), 8g of trimethylolpropane and 123g of butyl acetate are added into a reaction bottle, the mixture is heated to reflux under stirring, the temperature is reduced to 70 +/-5 ℃ after reflux dehydration is carried out for 1h, 54.6g of hexamethylene diisocyanate is added, the mixture is subjected to heat preservation reaction at 70 ℃ for 1h, the mixture is subjected to heat preservation reaction at 80 ℃ for 1h, the mixture is subjected to heat preservation reaction at 95 ℃ for 4h, the measured NCO% content is 2.5-5.0%, and the mass solid content is 60% -70%.
In the above examples 1-5, the component A and the component B are prepared into the coating according to the mass ratio of 1.3:1, and the rain erosion resistance, sand dust resistance, aging resistance, elongation, tensile strength and other properties of the coating are tested. The rain erosion resistance is tested by adopting ASTM G73-2010, and the mass loss is tested for 20 min; the sand dust resistance is tested by GJB150.12A; the artificial aging resistance is tested by GB/T14522, and the color difference and the powdering degree of the coating are tested within 3000 h; elongation and tensile strength were tested using GB 528.
The results of the tests on the products of examples 1-5 are as follows:
Claims (9)
1. a rain erosion resistant coating for the reverse thrust outer shell of an aircraft engine consists of a component A and a component B, wherein the solid content of the component A is 45-55 percent by mass, the solid content of the component B is 60-70 percent by mass,
the formula of the component A comprises the following components in percentage by mass:
the formula of the component B comprises the following components in percentage by mass:
preparing the component A and the component B into a coating according to the mass ratio of 1.3: 1;
the formula of the amino acid ester resin in the component A comprises the following components in percentage by mass:
20 to 35 percent of cycloaliphatic amine
50 to 60 percent of monoepoxy compound
15 to 25 percent of solvent,
the cycloaliphatic amine is at least one of 3,3 '-dimethyl-4, 4-diaminodicyclohexyl methane (MACM) and 4,4' -diaminodicyclohexyl methane;
the monoepoxy compound is at least one of butyl glycidyl ether, tertiary carbonic acid glycidyl ester, isooctyl glycidyl ether or gamma- (2, 3-epoxypropane) propyl trimethoxy silane;
the preparation method of the amino acid ester resin comprises the following steps: and uniformly stirring the cycloaliphatic amine, the monoepoxy compound and the solvent, heating to 120-130 ℃, reacting for 2-3 h, and cooling to obtain the amino acid ester resin.
2. The rain erosion resistant coating for the thrust reverser shell of an aircraft engine of claim 1, wherein the pigment in the component A is at least one of titanium dioxide, carbon black and chromium oxide green.
3. The rain erosion resistant coating for the thrust reverser shell body of an aircraft engine of claim 1, wherein the filler in the component A is at least one of mica powder, talcum powder, fumed silica and wax powder.
4. The rain erosion resistant coating for the thrust reverser shell of an aircraft engine of claim 1, wherein the solvent in the component A is at least one of butyl acetate, propylene glycol methyl ether acetate, cyclohexanone, and xylene.
5. The rain erosion resistant coating for an aircraft engine thrust reverser outer casing of claim 1, wherein the method of preparation of the A component is: and (2) sequentially adding a dispersing agent, a flatting agent, a defoaming agent, a pigment and a filler into the self-made amino acid ester resin, grinding until the fineness is less than 30 mu m, filtering and discharging to obtain a component A, wherein the mass solid content of the component A is 45-55%.
6. The rain erosion resistant coating for the thrust reversal outer shell of the aircraft engine as claimed in claim 1, wherein the preparation process of the component B is as follows: adding hydroxyl-containing polyester resin, polyalcohol and a solvent into a reaction bottle, heating to reflux under stirring, cooling to 70 +/-5 ℃ after refluxing and dehydrating for 1h, adding isocyanate, carrying out heat preservation reaction for 1h at 70 ℃, carrying out heat preservation reaction for 1h at 80 ℃, carrying out heat preservation reaction for 4h at 95 ℃, and measuring the NCO content to be 2.5-5% and the mass solid content to be 60-70%.
7. The rain erosion resistant coating for the reverse thrust outer shell of the aircraft engine as claimed in claim 1, wherein the hydroxyl-containing polyester resin in the component B is 89# resin produced by northern paint institute, the molecular weight is 1000-1500, and the mass solid content is 80-100%.
8. The weather-resistant coating for the thrust-back outer casing of an aircraft engine as claimed in claim 1, wherein the polyol in the component B is at least one of trimethylolpropane, 1, 4-butanediol, and neopentyl glycol.
9. The weather-resistant coating for the thrust reverser shell body of an aircraft engine of claim 1, wherein the polyisocyanate in the component B is at least one of IPDI and HDI.
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| CN114316765A (en) * | 2021-11-26 | 2022-04-12 | 中昊北方涂料工业研究设计院有限公司 | Wind power blade coating and preparation method thereof |
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| US9469768B1 (en) * | 2012-05-30 | 2016-10-18 | Pison Stream Solutions | Powder coating composition useful as a finish |
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| CN101735564B (en) * | 2009-12-22 | 2012-05-02 | 上海康达化工新材料股份有限公司 | Vacuum infusion resin for wind turbine blades and preparation method thereof |
| CN101805442A (en) * | 2010-04-22 | 2010-08-18 | 宏昌电子材料股份有限公司 | Epoxy resin composition for large wind blades and preparation method thereof |
| ITMI20111557A1 (en) * | 2011-08-30 | 2013-03-01 | Tecnoelastomeri S R L | POLIURETANI AND POLIURETANI-UREE HAVING IMPROVED PROPERTY |
| CN102391771B (en) * | 2011-10-14 | 2014-03-26 | 洛阳双瑞防腐工程技术有限公司 | Thick paste quick-drying type weather-resistant and wear-resistant coating for wind turbine blades and preparation method thereof |
| PT3105273T (en) * | 2014-02-13 | 2019-11-06 | Akzo Nobel Coatings Int Bv | Two component coating compositions and coatings produced therefrom having high erosion resistance |
| CN104130693B (en) * | 2014-07-30 | 2016-08-31 | 邓传均 | nanometer self-healing paint and preparation method thereof |
| CN105462484B (en) * | 2015-12-31 | 2018-05-11 | 江苏兰陵高分子材料有限公司 | A kind of weather-proof primer-topcoat integrated anticorrosive coating of large arch dam polyaspartic ester |
| CN106147560B (en) * | 2016-08-09 | 2018-02-13 | 厦门双瑞船舶涂料有限公司 | A kind of working life adjustable wind-driven power generation blade coating and preparation method thereof |
| CN107298930B (en) * | 2016-12-07 | 2020-05-26 | 江苏苏博特新材料股份有限公司 | Preparation and use method of organic silicon-polyurea self-layering coating |
| CN107216842B (en) * | 2017-07-29 | 2020-08-07 | 深圳市飞扬特化新材料有限公司 | Double-component polyaspartic acid ester urea hard adhesive and use method and application thereof |
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| US9469768B1 (en) * | 2012-05-30 | 2016-10-18 | Pison Stream Solutions | Powder coating composition useful as a finish |
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