CN112694820A - Preparation method of ultrafast-drying aqueous double-component acrylic acid refinishing paint - Google Patents
Preparation method of ultrafast-drying aqueous double-component acrylic acid refinishing paint Download PDFInfo
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- CN112694820A CN112694820A CN202011624988.0A CN202011624988A CN112694820A CN 112694820 A CN112694820 A CN 112694820A CN 202011624988 A CN202011624988 A CN 202011624988A CN 112694820 A CN112694820 A CN 112694820A
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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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- 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
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Abstract
The invention relates to a preparation method of an ultrafast-drying aqueous double-component acrylic acid refinishing paint, which comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 6: 1, mixing; adding deionized water for dilution and stirring uniformly, filtering by using a 200-mesh filter screen, spraying on the original finish with the defect polished by a No. 320 abrasive paper machine by using an air spray gun with the caliber of 1.3mm, and naturally drying to prepare a repair coating with the thickness of 30-50 mu m. The invention introduces acetylacetone for chelating tin ions in the organotin drier, thereby avoiding the problems of foaming of a paint film, low thickness of a blown film, short activation period and the like caused by the excessively fast reaction of water and a polyurethane curing agent in the early stage.
Description
Technical Field
The invention relates to the technical field of paint vehicles, in particular to a preparation method of an ultrafast-drying aqueous double-component acrylic acid refinishing paint.
Background
The aqueous acrylic acid dispersoid has high gloss, high fullness and excellent physical and chemical properties, so the aqueous bi-component acrylic acid finish paint adopting the aqueous acrylic acid dispersoid as the main resin is widely applied to the industries of engineering machinery, rail transit, business vehicles, agricultural vehicles and the like. Coating experts of companies such as the three-piece industrial and middle-sized automobile group share the experience of large-scale successful application of the waterborne two-component acrylic finish on a production line thereof in the 18 th waterborne technical year, and also provide a new problem, namely repair of the waterborne finish. In the field of engineering machinery, due to the characteristics of a production line, after a workpiece is coated on a main production line and is off-line, coating flaws need to be repaired, the repair is usually carried out in the open air, drying conditions do not exist after the repair is finished, and the workpiece needs to be quickly dried so as to be convenient to transport and vacate a production space. The bi-component repair finishing coat prepared by the aqueous acrylic acid dispersoid has slower drying speed and can not meet the requirement of the drying speed; the two-component repair paint prepared from the water-based acrylic emulsion has poor luster and fullness, and has larger appearance difference with the original paint after repair. If the solvent-based double-component acrylic acid refinishing paint is adopted for repairing, although the drying speed is high, the problems of high VOC, large smell, unorganized emission, fire risk and the like are difficult to meet the requirements of field control.
The traditional aqueous bi-component acrylic finish paint is adopted for repairing, and the paint is slow in drying speed, and cannot be dried in a short time after on-site repairing, so that the paint cannot be transported, and the construction period is influenced;
the traditional solvent-based bi-component acrylic finish paint is adopted for repairing, and although the drying speed is good, the paint has high VOC and large smell and has fire risk.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a preparation method of an ultrafast-drying aqueous double-component acrylic refinishing paint, which solves the defects of inconvenient repair due to slow drying of the traditional aqueous double-component acrylic finish paint, introduces an organic tin drier or other metal driers to accelerate the reaction between hydroxyl and a polyurethane curing agent, and changes a solvent for diluting the polyurethane curing agent into a solvent with fast volatilization so as to achieve the aim of quick drying.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the preparation method of the ultrafast-drying aqueous double-component acrylic acid refinishing paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 6: 1, mixing;
the preparation method of the component A comprises the following steps: step 1) putting 40.00-120.00 parts by mass of deionized water into a first plastic tank, then adding 1.00-3.00 parts by mass of an anti-settling agent at a rotating speed of 300RPM, gradually increasing the rotating speed to 3000RPM, and continuously stirring for 20 minutes to prepare anti-settling slurry for later use;
step 2) adding 130.00-210.00 parts by mass of deionized water into a second plastic tank, and then adding 10.00-30.00 parts by mass of a dispersing agent and the anti-settling slurry prepared in the step 1) at the rotating speed of 1500 RPM; then adding 30.0-200.00 parts by mass of coloring pigment at 500RPM, and stirring at 1500RPM for 10 minutes; adding 1.00-3.00 parts by mass of a defoaming agent at 1500RPM and stirring at 2000RPM for 20 minutes;
step 3) adding the product obtained in the step 2) into a dispersion cylinder, grinding for hours at 2500RPM until the fineness is less than 10 mu m, and then filtering to obtain color paste for later use;
step 4) adding 500.00-700.00 parts by mass of water-based hydroxy acrylic resin dispersoid into a third plastic tank, then adding 10.00-30.00 parts by mass of cosolvent, 6.00-10.00 parts by mass of wetting agent and the color paste prepared in the step 3) at the rotating speed of 1000RPM, 5.00-10.00 parts by mass of ultraviolet absorber, 10.00-20.00 parts by mass of hindered amine light stabilizer, 1.00-2.00 parts by mass of organic tin drier, 30.00-50.00 parts by mass of acetylacetone, 6.00-10.00 parts by mass of anti-flash rust agent, 1.00-3.00 parts by mass of defoaming agent, 1.00-2.00 parts by mass of thickening agent and 1.00-3.00 parts by mass of pH regulator, and stirring for 20 minutes at 1500RPM after adjusting the pH value to 7.5-8.0;
the preparation method of the component B comprises the following steps: and stirring 300.00-500.00 parts by mass of organic solvent and 500.00-700.00 parts by mass of low-viscosity polyurethane curing agent at 1000RPM for 10 minutes.
Further, the organic solvent is propylene glycol methyl ether acetate.
Further, the ratio of the hydroxyl group content to the NCO content in the a component and the B component is 1: 1.2-1.5, when in use, the mass ratio of the component A to the component B is 6: 1, adding deionized water accounting for 10-20% of the mass fraction of the mixture, diluting and uniformly stirring, filtering by using a 200-mesh filter screen, spraying on an original finish with a defect polished by a 320# sand paper machine by using an air spray gun with a diameter of 1.3mm, and naturally drying to prepare a repair coating with the thickness of 30-50 mu m.
(III) advantageous effects
The invention has the beneficial effects that: 1. the invention provides an ultrafast-drying aqueous double-component acrylic acid refinishing paint which can achieve the effects of surface drying within 30 minutes and actual drying within 2 hours.
2. The invention introduces an organic tin drier to catalyze the reaction of hydroxyl and a polyurethane curing agent, and adopts a solvent with higher volatilization speed to dilute the curing agent so as to achieve the effect of quick drying.
3. The invention introduces acetylacetone for chelating tin ions in the organotin drier, thereby avoiding the problems of foaming of a paint film, low thickness of a blown film, short activation period and the like caused by the excessively fast reaction of water and a polyurethane curing agent in the early stage.
Drawings
FIG. 1 is a schematic illustration of acetylacetone of the present invention;
FIG. 2 is a schematic view of a metal chelate compound of the present invention.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
The preparation method of the ultrafast-drying aqueous double-component acrylic acid refinishing paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 6: 1, mixing;
the preparation method of the component A comprises the following steps: step 1) putting 40.00-120.00 parts by mass of deionized water into a first plastic tank, then adding 1.00-3.00 parts by mass of an anti-settling agent at a rotating speed of 300RPM, gradually increasing the rotating speed to 3000RPM, and continuously stirring for 20 minutes to prepare anti-settling slurry for later use;
step 2) adding 130.00-210.00 parts by mass of deionized water into a second plastic tank, and then adding 10.00-30.00 parts by mass of a dispersing agent and the anti-settling slurry prepared in the step 1) at the rotating speed of 1500 RPM; then adding 30.0-200.00 parts by mass of coloring pigment at 500RPM, and stirring at 1500RPM for 10 minutes; adding 1.00-3.00 parts by mass of a defoaming agent at 1500RPM and stirring at 2000RPM for 20 minutes;
step 3) adding the product obtained in the step 2) into a dispersion cylinder, grinding for hours at 2500RPM until the fineness is less than 10 mu m, and then filtering to obtain color paste for later use;
step 4) adding 500.00-700.00 parts by mass of water-based hydroxy acrylic resin dispersoid into a third plastic tank, then adding 10.00-30.00 parts by mass of cosolvent, 6.00-10.00 parts by mass of wetting agent and the color paste prepared in the step 3) at the rotating speed of 1000RPM, 5.00-10.00 parts by mass of ultraviolet absorber, 10.00-20.00 parts by mass of hindered amine light stabilizer, 1.00-2.00 parts by mass of organic tin drier, 30.00-50.00 parts by mass of acetylacetone, 6.00-10.00 parts by mass of anti-flash rust agent, 1.00-3.00 parts by mass of defoaming agent, 1.00-2.00 parts by mass of thickening agent and 1.00-3.00 parts by mass of pH regulator, and stirring for 20 minutes at 1500RPM after adjusting the pH value to 7.5-8.0;
the preparation method of the component B comprises the following steps: and stirring 300.00-500.00 parts by mass of organic solvent and 500.00-700.00 parts by mass of low-viscosity polyurethane curing agent at 1000RPM for 10 minutes.
Further, the organic solvent is propylene glycol methyl ether acetate.
Further, the ratio of the hydroxyl group content to the NCO content in the a component and the B component is 1: 1.2-1.5, when in use, the mass ratio of the component A to the component B is 6: 1, adding deionized water accounting for 10-20% of the mass fraction of the mixture, diluting and uniformly stirring, filtering by using a 200-mesh filter screen, spraying on an original finish with a defect polished by a 320# sand paper machine by using an air spray gun with a diameter of 1.3mm, and naturally drying to prepare a repair coating with the thickness of 30-50 mu m.
In order to solve the defects that the traditional waterborne double-component acrylic finish paint is inconvenient to repair due to slow drying, the invention introduces an organic tin drier or other metal driers to accelerate the reaction between hydroxyl and a polyurethane curing agent, and changes a solvent for diluting the polyurethane curing agent in the component B into a solvent with fast volatilization so as to achieve the purpose of fast drying. Meanwhile, because the organic tin drier or other metal driers can catalyze the reaction of hydroxyl on the hydroxyl acrylic acid dispersoid and the polyurethane curing agent and can catalyze the reaction of water and the polyurethane curing agent simultaneously to generate carbon dioxide, the problems of serious foaming of a paint film, reduced thickness of a blown film and shortened activation period are caused; in order to avoid the disadvantage, a certain amount of acetylacetone is introduced into the component A, the structure of the acetylacetone is shown as figure 1, the acetylacetone and metal ions in the organic tin drier or other metal driers form metal chelates, the structure of the acetylacetone is shown as figure 2, and tin or other metals are wrapped to form steric hindrance effect, so that the catalytic action of tin or other metals is reduced, the side reaction between catalytic water and a polyurethane curing agent is avoided, and the problem of too short activation period is avoided; when the catalyst is sprayed on a substrate, water and acetylacetone gradually volatilize, tin or other metal ions are released again, and a good catalytic effect can be achieved.
Example 1:
the present invention comprises A, B two components.
Wherein the preparation process of the component A is as follows: putting 40.00 parts (by mass, the same below) of deionized water into a first plastic tank, adding 1.00 parts of Bentone DE (a moderate Hamming chemical Co., Ltd.) at a rotation speed of 300RPM, gradually increasing the rotation speed to 3000RPM, and continuously stirring for 20 minutes to prepare anti-settling slurry for later use;
adding 210.00 parts of deionized water into a second plastic tank, and then adding 30.00 parts of dispersant BYK-190 (Pic chemical Co., Ltd.) at the rotating speed of 1500RPM and preparing the anti-settling slurry by the step I; then 30.0 parts of MA-100 carbon black pigment (Mitsubishi chemical Co., Ltd.) was added at 500RPM and stirred at 1500RPM for 10 minutes; 3.00 parts of antifoam Tego 810 (Wingda Degussa chemical Co., Ltd.) were added at 1500RPM and stirred at 2000RPM for 20 minutes;
thirdly, adding the product prepared in the second step into a dispersion cylinder, grinding the product for hours at 2500RPM until the fineness of the product is less than 10 mu m, and filtering out color paste for later use;
fourthly, 700.00 parts of waterborne hydroxyl acrylic resin dispersoid Bayhydrol A145 (manufactured by Korsaki chemical Co., Ltd.) is put into a third plastic tank, then 10.00 parts of cosolvent dipropylene glycol butyl ether, 10.00 parts of wetting agent BYK-346 (manufactured by Bicko chemical Co., Ltd.) and color paste prepared by the step III are added at the rotating speed of 1000RPM, 5.000 parts of ultraviolet light absorber Tinuvin 400DW (N) (manufactured by Pasv chemical Co., Ltd.), 10.00 parts of hindered amine light stabilizer Tinuvin 123DW (N) (manufactured by Pasv chemical Co., Ltd.), 2.00 parts of organic tin drier DY-60 (manufactured by Shanghai De Sound chemical Co., Ltd.), 50.00 parts of acetylacetone, 6.00 parts of flash rust inhibitor H-14 (manufactured by Ascherdy Co., France), 3.00 parts of defoaming agent BYK-015 (manufactured by Bicko chemical Co., Ltd.), 1.00 parts of thickener SN-660T (manufactured by Sunko chemical Co., Ltd.) and 3.00 parts of pH regulator DMEA, adjusting the pH value to 7.5-8.0, and stirring at 1500RPM for 20 minutes;
the preparation process of the component B is as follows:
300.00 parts of propylene glycol methyl ether acetate as an organic solvent and 700.00 parts of a polyurethane curing agent HT-600 (Futtawanghem chemical Co., Ltd.) were stirred at 1000RPM for 10 minutes.
When in use, the component A and the component B are mixed according to the mass ratio of 6: 1, and uniformly mixing to obtain the product.
The component A and the component B are mixed according to the mass ratio of 6: 1, uniformly mixing, wherein the ratio of NCO content to hydroxyl content in the component A and the component B is 1.2-1.5: 1, when in use, 10-20% of deionized water is added to dilute and uniformly stir, a 200-mesh filter screen is used for filtering, then an air spray gun with the caliber of 1.3mm is used for spraying on original finish with defects polished by a No. 320 abrasive paper machine, and natural drying is carried out to prepare the repair coating with the thickness of 30-50 mu m.
Example 2:
the present invention comprises A, B two components.
Wherein the preparation process of the component A is as follows: putting 80.00 parts (by mass, the same below) of deionized water into a first plastic tank, adding 2.00 parts of Bentone DE (a moderate Hamming chemical Co., Ltd.) at a rotation speed of 300RPM, gradually increasing the rotation speed to 3000RPM, and continuously stirring for 20 minutes to prepare anti-settling slurry for later use;
adding 170.00 parts of deionized water into a second plastic tank, and then adding 20.00 dispersant BYK-2015 (Pic chemical Co., Ltd.) at the rotating speed of 1500RPM and preparing the prepared anti-settling slurry; then 100.0 parts CINILEX DPP RED SR1C (Nicotiana pigment Co., Ltd.) was added at 500RPM and stirred at 1500RPM for 10 minutes; 2.00 parts of antifoam Tego 810 (Wingda Degussa chemical Co., Ltd.) were added at 1500RPM and stirred at 2000RPM for 20 minutes;
thirdly, adding the product prepared in the second step into a dispersion cylinder, grinding the product for hours at 2500RPM until the fineness of the product is less than 10 mu m, and filtering out color paste for later use;
600.00 parts of waterborne hydroxyl acrylic resin dispersoid Bayhydrol A145 (Corseiko chemical Co., Ltd.) is put into a third plastic tank, then 20.00 parts of cosolvent dipropylene glycol butyl ether, 8.00 parts of wetting agent BYK-345 (Bicko chemical Co., Ltd.) and the color paste prepared in step (C.) are added at the rotating speed of 1000RPM, 10.000 parts of ultraviolet light absorber Tinuvin 400DW (N) (Pasteur chemical Co., Ltd.), 20.00 parts of hindered amine light stabilizer Tinuvin 123DW (N) (Pasteur chemical Co., Ltd.), 1.00 parts of organic tin drier DY-60 (Shanghai De Sound chemical Co., Ltd.), 40.00 parts of acetylacetone, 8.00 parts of flash rust inhibitor H-14 (Asteur chemical Co., France), 2.00 parts of defoaming agent BYK-015 (Bicko chemical Co., Ltd.), 1.50 parts of thickener SN-660T (Sankyo chemical Co., Ltd.) and 2.00 parts of pH regulator DMEA, adjusting the pH value to 7.5-8.0, and stirring at 1500RPM for 20 minutes;
the preparation process of the component B is as follows:
400.00 parts of propylene glycol methyl ether acetate as an organic solvent and 600.00 parts of Desmodur N3300 (Corsai chemical Co., Ltd.) as a polyurethane curing agent were stirred at 1000RPM for 10 minutes.
When in use, the component A and the component B are mixed according to the mass ratio of 6: 1, and uniformly mixing to obtain the product.
The component A and the component B are mixed according to the mass ratio of 6: 1, uniformly mixing, wherein the ratio of NCO content to hydroxyl content in the component A and the component B is 1.2-1.5: 1, when in use, 10-20% of deionized water is added to dilute and uniformly stir, a 200-mesh filter screen is used for filtering, then an air spray gun with the caliber of 1.3mm is used for spraying on original finish with defects polished by a No. 320 abrasive paper machine, and natural drying is carried out to prepare the repair coating with the thickness of 30-50 mu m.
Example 3:
the present invention comprises A, B two components.
Wherein the preparation process of the component A is as follows: putting 120.00 parts (by mass, the same below) of deionized water into a first plastic tank, adding 3.00 parts of Bentone LT (a modest Hamming chemical Co., Ltd.) at a rotation speed of 300RPM, gradually increasing the rotation speed to 3000RPM, and continuously stirring for 20 minutes to prepare anti-settling slurry for later use;
adding 130.00 parts of deionized water into a second plastic tank, and then adding 10.00 parts of dispersant BYK-2015 (Pic chemical Co., Ltd.) at the rotating speed of 1500RPM and preparing the prepared anti-settling slurry; then 200.0 parts of R-902 titanium dioxide (DuPont pigment chemical Co., Ltd.) was added at 500RPM and stirred at 1500RPM for 10 minutes; 1.00 part of antifoam Tego 810 (Wingda Degussa chemical Co., Ltd.) was added at 1500RPM and stirred at 2000RPM for 20 minutes;
thirdly, adding the product prepared in the second step into a dispersion cylinder, grinding the product for hours at 2500RPM until the fineness of the product is less than 10 mu m, and filtering out color paste for later use;
fourthly, 500.00 parts of aqueous hydroxy acrylic resin dispersion Setaqua6515 (Zhan Xin chemical Co., Ltd.) is put into a third plastic tank, and then 30.00 parts of cosolvent dipropylene glycol butyl ether, 6.00 parts of wetting agent Twin-4100 (Create Degussa chemical Co., Ltd.) and the color paste prepared by step (c) are added at a rotation speed of 1000RPM, 8.000 parts of ultraviolet light absorber Tinuvin 400DW (N) (Pasv chemical Co., Ltd.), 15.00 parts of hindered amine light stabilizer Tinuvin 123DW (N) (Pasv chemical Co., Ltd.), 1.50 parts of organotin drier DY-60 (Shanghai Degussa chemical Co., Ltd.), 30.00 parts of acetylacetone, 10.00 parts of anti-flash rust agent H-14 (Astrody Kody Co., Ltd.), 1.00 part of defoaming agent BYK-015 (Pictures chemical Co., Ltd.), 2.00 parts of thickener SN-660T (Sanuo chemical Co., Ltd.) and 1.00 part of pH regulator DMEA, adjusting the pH value to 7.5-8.0, and stirring at 1500RPM for 20 minutes;
the preparation process of the component B is as follows:
500.00 parts of propylene glycol methyl ether acetate as an organic solvent and 500.00 parts of TLA-100 (Asahi Chemicals Co., Ltd.) as a polyurethane curing agent were stirred at 1000RPM for 10 minutes.
When in use, the component A and the component B are mixed according to the mass ratio of 6: 1, and uniformly mixing to obtain the product.
The component A and the component B are mixed according to the mass ratio of 6: 1, uniformly mixing, wherein the ratio of NCO content to hydroxyl content in the component A and the component B is 1.2-1.5: 1, when in use, 10-20% of deionized water is added to dilute and uniformly stir, a 200-mesh filter screen is used for filtering, then an air spray gun with the caliber of 1.3mm is used for spraying on original finish with defects polished by a No. 320 abrasive paper machine, and natural drying is carried out to prepare the repair coating with the thickness of 30-50 mu m.
Comparative example:
this comparative example contains A, B two components.
Wherein the preparation process of the component A is as follows: putting 120.00 parts (by mass, the same below) of deionized water into a first plastic tank, adding 3.00 parts of Bentone LT (a modest Hamming chemical Co., Ltd.) at a rotation speed of 300RPM, gradually increasing the rotation speed to 3000RPM, and continuously stirring for 20 minutes to prepare anti-settling slurry for later use;
adding 130.00 parts of deionized water into a second plastic tank, and then adding 10.00 parts of dispersant BYK-2015 (Pic chemical Co., Ltd.) at the rotating speed of 1500RPM and preparing the prepared anti-settling slurry; then 200.0 parts of R-902 titanium dioxide (DuPont pigment chemical Co., Ltd.) was added at 500RPM and stirred at 1500RPM for 10 minutes; 1.00 part of antifoam Tego 810 (Wingda Degussa chemical Co., Ltd.) was added at 1500RPM and stirred at 2000RPM for 20 minutes;
thirdly, adding the product prepared in the second step into a dispersion cylinder, grinding the product for hours at 2500RPM until the fineness of the product is less than 10 mu m, and filtering out color paste for later use;
fourthly, putting 500.00 parts of aqueous hydroxy acrylic resin dispersion Setaqua6515 (Zhan Xin chemical Co., Ltd.) into a third plastic tank, adding 60.00 parts of cosolvent dipropylene glycol butyl ether, 6.00 parts of wetting agent Twin-4100 (Woodsie chemical Co., Ltd.) and the color paste prepared by the third step at the rotating speed of 1000RPM, 8.000 parts of ultraviolet light absorber Tinuvin 400DW (N) (Pasv chemical Co., Ltd.), 15.00 parts of hindered amine light stabilizer Tinuvin 123DW (N) (Pasv chemical Co., Ltd.), 10.00 parts of anti-flash rust H-14 (Ascordi France), 1.00 parts of defoaming agent BYK-015 (Bikk chemical Co., Ltd.), 2.00 parts of thickener-660T (Santa Nuo Puck chemical Co., Ltd.) and 1.00 parts of pH regulator DMEA, and stirring at 1500RPM for 20 minutes after adjusting the pH value to 7.5-8.0;
the preparation process of the component B is as follows:
500.00 parts of diethylene glycol monoethyl ether acetate as an organic solvent and 500.00 parts of a polyurethane curing agent TLA-100 (Asahi Chemicals Co., Ltd.) were stirred at 1000RPM for 10 minutes.
When in use, the component A and the component B are mixed according to the mass ratio of 6: 1, and uniformly mixing to obtain the product.
The component A and the component B are mixed according to the mass ratio of 6: 1, uniformly mixing, wherein the ratio of NCO content to hydroxyl content in the component A and the component B is 1.2-1.5: 1, when in use, 10-20% of deionized water is added to dilute and uniformly stir, a 200-mesh filter screen is used for filtering, then an air spray gun with the caliber of 1.3mm is used for spraying on original finish with defects polished by a No. 320 abrasive paper machine, and natural drying is carried out to prepare the repair coating with the thickness of 30-50 mu m.
Compared with the examples 1, 2 and 3, the comparative example adopts the method of the conventional aqueous two-component acrylic refinish paint, the component A is not additionally added with an organic tin drier and acetylacetone for chelating tin ions, and the component B is not used with a quick-drying solvent propylene glycol methyl ether acetate.
The performance test data for the examples and comparative examples are shown in the following table:
and (4) conclusion: from the above results, it can be seen that the surface drying speed and the actual drying speed of the aqueous two-component acrylic refinishing paint can be greatly improved by adopting the organic tin or other metal salt drier in combination with the quick-drying curing agent, and the storage stability, the activation period, the thickness of the popping film, the water resistance and the like are not affected under the condition of introducing the chelating agent acetylacetone. Therefore, the ultrafast-drying aqueous bi-component acrylic refinishing paint provided by the invention can be conveniently applied to aqueous industrial coating of engineering machinery, rail transit and the like, avoids the problems of VOC (volatile organic compound) emission, fire risk and the like caused by the adoption of solvent-based refinishing paint, is fast in process rhythm, shortens the delivery cycle and has a very practical value.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (3)
1. The preparation method of the ultra-fast drying aqueous double-component acrylic acid refinishing paint is characterized in that the ultra-fast drying aqueous double-component acrylic acid refinishing paint comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 6: 1, mixing;
the preparation method of the component A comprises the following steps: step 1) putting 40.00-120.00 parts by mass of deionized water into a first plastic tank, then adding 1.00-3.00 parts by mass of an anti-settling agent at a rotating speed of 300RPM, gradually increasing the rotating speed to 3000RPM, and continuously stirring for 20 minutes to prepare anti-settling slurry for later use;
step 2) adding 130.00-210.00 parts by mass of deionized water into a second plastic tank, and then adding 10.00-30.00 parts by mass of a dispersing agent and the anti-settling slurry prepared in the step 1) at the rotating speed of 1500 RPM; then adding 30.0-200.00 parts by mass of coloring pigment at 500RPM, and stirring at 1500RPM for 10 minutes; adding 1.00-3.00 parts by mass of a defoaming agent at 1500RPM and stirring at 2000RPM for 20 minutes;
step 3) adding the product obtained in the step 2) into a dispersion cylinder, grinding for hours at 2500RPM until the fineness is less than 10 mu m, and then filtering to obtain color paste for later use;
step 4) adding 500.00-700.00 parts by mass of water-based hydroxy acrylic resin dispersoid into a third plastic tank, then adding 10.00-30.00 parts by mass of cosolvent, 6.00-10.00 parts by mass of wetting agent and the color paste prepared in the step 3) at the rotating speed of 1000RPM, 5.00-10.00 parts by mass of ultraviolet absorber, 10.00-20.00 parts by mass of hindered amine light stabilizer, 1.00-2.00 parts by mass of organic tin drier, 30.00-50.00 parts by mass of acetylacetone, 6.00-10.00 parts by mass of anti-flash rust agent, 1.00-3.00 parts by mass of defoaming agent, 1.00-2.00 parts by mass of thickening agent and 1.00-3.00 parts by mass of pH regulator, and stirring for 20 minutes at 1500RPM after adjusting the pH value to 7.5-8.0;
the preparation method of the component B comprises the following steps: and stirring 300.00-500.00 parts by mass of organic solvent and 500.00-700.00 parts by mass of low-viscosity polyurethane curing agent at 1000RPM for 10 minutes.
2. The method of claim 1, wherein the organic solvent is propylene glycol methyl ether acetate.
3. The method for preparing the ultra-fast-drying aqueous two-component acrylic refinish paint according to claim 1, wherein the ratio of the hydroxyl content to the NCO content in the a component and the B component is 1: 1.2-1.5, when in use, the mass ratio of the component A to the component B is 6: 1, adding deionized water accounting for 10-20% of the mass fraction of the mixture, diluting and uniformly stirring, filtering by using a 200-mesh filter screen, spraying on an original finish with a defect polished by a 320# sand paper machine by using an air spray gun with a diameter of 1.3mm, and naturally drying to prepare a repair coating with the thickness of 30-50 mu m.
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Cited By (1)
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| CN115926599A (en) * | 2022-12-29 | 2023-04-07 | 无锡拓辉新材料科技有限公司 | Membrane material for protecting curved screen of mobile phone |
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Application publication date: 20210423 |