CN112625575A - Water-based polyurethane finish paint for rail transit and preparation method thereof - Google Patents
Water-based polyurethane finish paint for rail transit and preparation method thereof Download PDFInfo
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- CN112625575A CN112625575A CN202011503707.6A CN202011503707A CN112625575A CN 112625575 A CN112625575 A CN 112625575A CN 202011503707 A CN202011503707 A CN 202011503707A CN 112625575 A CN112625575 A CN 112625575A
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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
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
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Abstract
A rail transit water-based polyurethane finish paint belongs to the field of paints and comprises a base paint, an isocyanate curing agent and deionized water, wherein the base paint comprises raw materials of water-based hydroxyl acrylic resin, a wetting dispersant, pigment titanium white, a nano interface hydrophobing agent mixsperse320, a leveling agent, a defoaming agent, deionized water, a film forming agent and a thickening agent, the curing agent is prepared from a low-viscosity hydrophobic HDI trimer and PGDA (poly (propylene glycol diisocyanate)), a coating film can be spread and coated on a network-shaped oleophilic end on the surface after being dried, external chemical corrosion is effectively isolated and isolated physically, and the acid resistance, alkali resistance and temperature and water resistance of the rail transit water-based polyurethane finish paint are improved.
Description
Technical Field
The invention relates to a water-permeable polyurethane finish paint for rail transit and a preparation method thereof, belonging to the field of paints.
Background
Along with the development of the industry, according to related data, the total emission of Volatile Organic Compounds (VOCs) of solvent-based paint products in China is up to 400 ten thousand tons every year, which is equivalent to the emission of 2.7 million tons of coal. After one ton of solvent-based resin is changed into water-based resin, the emission of harmful volatile matters such as VOCs can be reduced to one tenth, and great contribution can be made to energy conservation and emission reduction. In China, solvent-based coatings are still used in rail vehicles. The amount of paint used for rail transit vehicles such as subways, high-speed rails, urban rails and the like is about 4 ten thousand tons every year, and Volatile Organic Compounds (VOCs) discharged into the atmosphere every year are not less than 2 ten thousand tons together with a diluent for construction. The use of the track traffic waterborne polyurethane finish paint can effectively reduce or avoid the pollution of high-pollution paint production enterprises to the environment, save energy, protect environment and save resources.
The Chinese patent 2016108291786 discloses a water-based two-component polyurethane finish paint which is composed of a component A and a component B: the component A comprises the following components in parts by weight: 15-32 parts of water-based hydroxyl polyacrylate dispersoid, 12-30 parts of water-based anionic polyacrylate dispersoid, 0.02-2 parts of defoaming agent, 0.5-3 parts of flatting agent, 1-5 parts of wetting dispersant, 0.2-4 parts of anti-sagging additive, 0.3-1.5 parts of adhesion promoter, 1-3 parts of anti-aging agent, 12-20 parts of ultraviolet-resistant filler, 10-20 parts of volume filler and 8-30 parts of water; the component B comprises the following components in parts by weight: 60-80 parts of hydrophilic modified aliphatic polyisocyanate curing agent and 20-40 parts of solvent. The finish paint is safe and environment-friendly, the appearance of a paint film is flat, the corrosion resistance and the aging resistance are excellent, and the preparation method is simple. However, the water-based two-component polyurethane finish paint has normal temperature water resistance, and according to the test of the rail transit paint, the water-based two-component polyurethane finish paint requires 40 ℃ warm water resistance, and cannot be applied to rail transit.
Disclosure of Invention
The invention aims to solve the technical problems that the water-based polyurethane finish paint used by rail transit vehicles such as high-speed rails and urban rails partially does not meet the chemical resistance and the warm water resistance, and the detection standard is developed by adopting (Q/CRRC J44-2019) so as to improve the acid and alkali resistance and the warm water resistance at 40 ℃ of the paint and meet the requirements of the latest standard of rail transit.
The technical scheme of the invention is as follows: a water-permeable polyurethane finish paint for rail transit is characterized by comprising a base paint, a curing agent and deionized water, wherein 100 parts by weight of the base paint is matched with 20-25 parts by weight of the curing agent and 10-15 parts by weight of the deionized water;
the matrix coating comprises the following components in parts by weight:
50-60 parts of water-based hydroxyl acrylic resin
0.5-2 parts of wetting dispersant
15-25 parts of pigment
Nano interface hydrophobizing agent mixsperse 3200.5-2 parts
0.5-1 part of flatting agent
0.5-1 part of defoaming agent
5-10 parts of deionized water
1-3 parts of film forming agent
0.5-1 part of a thickening agent;
the curing agent consisted of 80 parts by weight of a low viscosity hydrophobic HDI trimer and 20 parts of propylene glycol diacetate.
The nano interface hydrophobizing agent mixsperse320 is an amphiphilic surface hydrophobizing agent of a lipophilic end produced by German Ming & Ling company, the lipophilic end is in a network shape, and is used in a track traffic waterborne polyurethane finish paint formula to be mixed with a hydrophobic waterborne isocyanate curing agent for use, and the nano interface hydrophobizing agent mixsperse320 can form a network lipophilic end spreading coating on the surface after a coating film is dried; the water-permeable polyurethane finish paint has the advantages of effectively isolating and isolating external chemical corrosion physically, improving the acid resistance, alkali resistance and warm water resistance of the water-permeable polyurethane finish paint for rail transit, and playing a fundamental guarantee for improving the acid resistance, alkali resistance and warm water resistance at 40 ℃.
The water-based hydroxyl acrylic resin is preferably one or two mixtures of YG-AD-548 of Beijing Jinhuili chemical engineering Co., Ltd or SRF-637 water-based fluorocarbon dispersion of Beijing Huatonghruichi materials science and technology Co., Ltd.
The wetting dispersant is preferably EDAPLAN 490 or mixsperse830W polymer copolymer aqueous solutions of German Ming Ling, does not contain VOC and APEO aqueous wetting dispersants, has excellent effects of reducing viscosity and stabilizing color paste in an aqueous system, can effectively improve luster, color strength and hiding power, and prevents the defects of flooding and floating.
The pigment is one or two mixtures of Dongjia rutile titanium dioxide R2377 and DuPont R-902 rutile titanium dioxide.
The leveling agent is one or a combination of TEGO-450 or BYK-348 leveling agents.
The defoaming agent is star-shaped modified mineral oil or organosilicon defoaming agent, and is one or a combination of TEGO-901W or BASF ST2410 AG.
The film forming agent is one or a combination of dipropylene glycol methyl ether and dipropylene glycol monobutyl ether.
The thickening agent is one or a combination of TAFIGEL PUR 65 nonionic polyurethane thickening agent or RHEOVIS AS1130 acrylic acid copolymer emulsion thickening agent.
A preparation method of a water-based polyurethane finish paint for rail transit is characterized by comprising the following steps:
(1) preparing a matrix coating:
putting aqueous hydroxyl acrylic resin, deionized water and a wetting dispersant into a dry and clean pulling cylinder according to the weight component ratio, starting a stirrer, adjusting the rotating speed to 300-800 r/min, stirring for 3-5 mins, and sequentially adding a defoaming agent, a pigment, a nano interface hydrophobing agent mixsperse320, a flatting agent, a defoaming agent, a film forming agent and a thickening agent under uniform stirring to form a mixed solution; adjusting the rotating speed of the stirrer to 800-1500 r/min, stirring for 15-25 mins, and connecting a discharge pipeline into a nano sand mill after the mixed liquid is uniformly stirred; starting the nano sand mill, gradually increasing the rotating speed to 2000r/min at the rotating speed increasing rate of 100-200r/min, controlling the temperature of the nano sand mill during slurry grinding to be between 40 and 60 ℃, and causing a resin emulsion breaking phenomenon when the temperature is too high; grinding until the fineness reaches 10 mu m.
(2) Preparation of the curing agent:
adding low-viscosity hydrophobic HDI tripolymer and Propylene Glycol Diacetate (PGDA) into a dry and clean drawn cylinder according to the weight component ratio, starting a stirrer, adjusting the rotating speed to 300-800 r/min, stirring for 10-15 min, and uniformly stirring to obtain the curing agent.
(3) Adding the base coating and the curing agent into a clean container according to the weight component ratio, uniformly mixing, adding deionized water, uniformly mixing again, and filtering by using a filter screen of 100-200 meshes to obtain the coating.
The track traffic waterborne polyurethane finish paint has the beneficial effects that:
(1) according to the invention, a nano interface hydrophobic agent mixsperse320 is adopted, and a network-shaped oleophilic end is formed on the surface of a coating film and is spread and coated after the coating film is dried; the water-borne polyurethane finish paint has the advantages of effectively isolating and isolating external chemical corrosion physically, and improving the acid resistance, alkali resistance and temperature resistance of the water-borne polyurethane finish paint for rail transit.
(2) Compared with solvent type polyurethane coating, the invention greatly reduces VOC content, saves energy, reduces pollution to environment, improves ecological environment, reduces harm to human health, has no danger of combustion and explosion, and has good storage stability.
Detailed Description
Example 1 to example 4
The water-permeable polyurethane finish paint for rail transit is composed of a base paint, an isocyanate curing agent and deionized water, wherein the base paint, the isocyanate curing agent and the deionized water are matched according to the weight proportion shown in the table I, the base paint is prepared from water-based hydroxyl acrylic resin, a wetting dispersant, pigment titanium dioxide, a nano interface hydrophobing agent mixsperse320, a flatting agent, a defoaming agent, the deionized water, a film forming agent and a thickening agent, the weight proportion of all the components is shown in the table II, and the curing agent is prepared from 80 parts of low-viscosity hydrophobic HDI tripolymer and 20 parts of PGDA.
The preparation method of the track traffic waterborne polyurethane finish paint comprises the following steps:
(1) preparing a matrix coating:
putting aqueous hydroxyl acrylic resin, deionized water and a wetting dispersant into a dry and clean pulling cylinder according to the weight component ratio, starting a stirrer, adjusting the rotating speed to 300-800 r/min, stirring for 3-5 mins, and sequentially adding a defoaming agent, a pigment, a nano interface hydrophobing agent mixsperse320, a flatting agent, a defoaming agent, a film forming agent and a thickening agent under uniform stirring to form a mixed solution; adjusting the rotating speed of the stirrer to 800-1500 r/min, stirring for 15-25 mins, and connecting a discharge pipeline into a nano sand mill after the mixed liquid is uniformly stirred; starting the nano sand mill, gradually increasing the rotating speed to 2000r/min at the rotating speed increasing rate of 100-200r/min, controlling the temperature of the nano sand mill during slurry grinding to be between 40 and 60 ℃, and causing a resin emulsion breaking phenomenon when the temperature is too high; grinding until the fineness reaches 10 mu m.
(2) Preparation of the curing agent:
adding low-viscosity hydrophobic HDI tripolymer and Propylene Glycol Diacetate (PGDA) into a dry and clean drawn cylinder according to the weight component ratio, starting a stirrer, adjusting the rotating speed to 300-800 r/min, stirring for 10-15 min, and uniformly stirring to obtain the curing agent.
(3) Adding the base coating and the curing agent into a clean container according to the weight component ratio, uniformly mixing, adding deionized water, uniformly mixing again, and filtering by using a filter screen of 100-200 meshes to obtain the coating.
The test process comprises the following steps:
1. according to the performance requirement of the water-permeable polyurethane finish paint for rail transit, testing is carried out by adopting (Q/CRRC J44-2019) according to the rail transit detection standard.
1.1, the technical requirements of a plate substrate are as follows:
the base material of the test panel is a cold-rolled steel plate with the thickness of less than or equal to 0.8 mm, and the base plate of the bending performance test panel is a tin plate with the thickness of 0.2-0.3 mm.
1.2, surface treatment:
the tinplate, the cold-rolled steel plate, the stainless steel plate and the aluminum alloy plate are ground, and the surface cleanliness grade reaches the grade Sa 2.5 specified in GB/T8923.1. And wiping the surface of the treated substrate by using a solvent.
1.3, finish paint coating preparation:
the spraying is finished by adopting a wet-on-wet method for one-time or multi-time coating, the dry film thickness of the coating film of the test board for the locomotive and the passenger car is (30 +/-5) mu m except the dry film thickness of the coating film of the test board for resisting the artificial climate acceleration test, the liquid medium test and the water resistance test; the dry film thickness of the coating film of the test panel for the trucks, the urban rail vehicles and the motor train units is (60 +/-5) mu m.
1.4, coating film drying conditions:
except for special provisions, the preparation of single-coated panels should be conditioned and forced to dry. After the spraying is finished, the paint is placed for 2 hours, then is baked for 2 hours at the temperature of 60 +/-2 ℃, and is placed for 7 days for performance test.
1.5, the performance detection is shown as the table:
the test results in the table show that the embodiments 1 to 4 all meet the rail transit detection requirements and also achieve the purpose of initial development.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. A water-permeable polyurethane finish paint for rail transit is characterized by comprising a base paint, a curing agent and deionized water, wherein 100 parts by weight of the base paint is matched with 20-25 parts by weight of the curing agent and 10-15 parts by weight of the deionized water;
the matrix coating comprises the following components in parts by weight:
50-60 parts of water-based hydroxyl acrylic resin
0.5-2 parts of wetting dispersant
15-25 parts of pigment
Nano interface hydrophobizing agent mixsperse 3200.5-2 parts
0.5-1 part of flatting agent
0.5-1 part of defoaming agent
5-10 parts of deionized water
1-3 parts of film forming agent
0.5-1 part of a thickening agent;
the curing agent consisted of 80 parts by weight of a low viscosity hydrophobic HDI trimer and 20 parts of propylene glycol diacetate.
2. The track traffic waterborne polyurethane finish coating of claim 1, wherein the waterborne hydroxyl acrylic resin is one or a mixture of YG-AD-548 of Beijing Kinghuili chemical Co., Ltd or SRF-637 waterborne fluorocarbon dispersion of Beijing Walsh materials science and technology Co., Ltd.
3. The waterborne polyurethane topcoat coating composition as claimed in claim 1, wherein the wetting dispersant is an aqueous solution of EDAPLAN 490 or mixsperse830W high molecular copolymer from german, rabdosia.
4. The waterborne polyurethane finish coating for rail transit of claim 1, wherein the pigment is one or a mixture of R2377 from Doujia rutile titanium dioxide and R-902 from DuPont rutile titanium dioxide.
5. The track-traffic waterborne polyurethane topcoat coating of claim 1, wherein the leveling agent is one or a combination of a TEGO-450 or BYK-348 leveling agent.
6. The track-traffic waterborne polyurethane finish coating of claim 1, wherein the defoamer is star-type modified mineral oil or silicone defoamer and is one or a combination of TEGO-901W or BASF ST2410 AG.
7. The track traffic waterborne polyurethane finish coating of claim 1, wherein the film former is one or a combination of dipropylene glycol methyl ether and dipropylene glycol monobutyl ether.
8. The track traffic waterborne polyurethane finish coating of claim 1, wherein the thickener is one or a combination of TAFIGEL PUR 65 nonionic polyurethane thickener or RHEOVIS AS1130 acrylic acid copolymer emulsion thickener.
9. A preparation method of a water-based polyurethane finish paint for rail transit is characterized by comprising the following steps:
(1) preparing a matrix coating:
putting aqueous hydroxyl acrylic resin, deionized water and a wetting dispersant into a dry and clean pulling cylinder according to the weight component ratio, starting a stirrer, adjusting the rotating speed to 300-800 r/min, stirring for 3-5 mins, and sequentially adding a defoaming agent, a pigment, a nano interface hydrophobing agent mixsperse320, a flatting agent, a defoaming agent, a film forming agent and a thickening agent under uniform stirring to form a mixed solution; adjusting the rotating speed of the stirrer to 800-1500 r/min, stirring for 15-25 mins, and connecting a discharge pipeline into a nano sand mill after the mixed liquid is uniformly stirred; starting the nano sand mill, gradually increasing the rotating speed to 2000r/min at the rotating speed increasing rate of 100-200r/min, controlling the temperature of the nano sand mill during slurry grinding to be between 40 and 60 ℃, and grinding until the fineness reaches 10 mu m;
(2) preparation of the curing agent:
putting low-viscosity hydrophobic HDI tripolymer and Propylene Glycol Diacetate (PGDA) into a dry and clean drawn cylinder according to the weight component ratio, starting a stirrer, adjusting the rotating speed to 300-800 r/min, stirring for 10-15 min, and uniformly stirring to obtain a curing agent;
(3) adding the base coating and the curing agent into a clean container according to the weight component ratio, uniformly mixing, adding deionized water, uniformly mixing again, and filtering by using a filter screen of 100-200 meshes to obtain the coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011503707.6A CN112625575A (en) | 2020-12-18 | 2020-12-18 | Water-based polyurethane finish paint for rail transit and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011503707.6A CN112625575A (en) | 2020-12-18 | 2020-12-18 | Water-based polyurethane finish paint for rail transit and preparation method thereof |
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| CN112625575A true CN112625575A (en) | 2021-04-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114854294A (en) * | 2022-03-22 | 2022-08-05 | 湖南省德谦新材料有限公司 | Self-cleaning waterborne polyurethane finish paint for environmental engineering vehicle and preparation method thereof |
| CN114989717A (en) * | 2022-07-21 | 2022-09-02 | 武汉沃克菲诺涂装技术有限公司 | Preparation and application of paint special for outer wall of cast pipe |
| CN115678402A (en) * | 2022-11-01 | 2023-02-03 | 中远关西涂料（上海）有限公司 | Preparation method of aqueous two-component intermediate coating composition for special vehicle |
| CN115851101A (en) * | 2022-11-16 | 2023-03-28 | 中车长江车辆有限公司 | Coating composition, preparation method thereof, coating and application thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114854294A (en) * | 2022-03-22 | 2022-08-05 | 湖南省德谦新材料有限公司 | Self-cleaning waterborne polyurethane finish paint for environmental engineering vehicle and preparation method thereof |
| CN114989717A (en) * | 2022-07-21 | 2022-09-02 | 武汉沃克菲诺涂装技术有限公司 | Preparation and application of paint special for outer wall of cast pipe |
| CN115678402A (en) * | 2022-11-01 | 2023-02-03 | 中远关西涂料（上海）有限公司 | Preparation method of aqueous two-component intermediate coating composition for special vehicle |
| CN115851101A (en) * | 2022-11-16 | 2023-03-28 | 中车长江车辆有限公司 | Coating composition, preparation method thereof, coating and application thereof |
| CN115851101B (en) * | 2022-11-16 | 2023-09-19 | 中车长江车辆有限公司 | Coating composition, preparation method thereof, coating and application thereof |
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Application publication date: 20210409 |