CN116020724A - Water-based paint spraying process - Google Patents
Water-based paint spraying process Download PDFInfo
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- CN116020724A CN116020724A CN202211520652.9A CN202211520652A CN116020724A CN 116020724 A CN116020724 A CN 116020724A CN 202211520652 A CN202211520652 A CN 202211520652A CN 116020724 A CN116020724 A CN 116020724A
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Abstract
The invention provides a water-based paint spraying process, which comprises the following steps of: a) Phosphating the substrate to obtain a phosphatized substrate; b) Spraying water paint on the phosphatized substrate by adopting a roll spraying machine to obtain a substrate containing a water-based coating; c) Spraying and baking the substrate containing the water-based coating by using the oil paint; obtaining the product. The invention optimizes the rolling spraying and hand spraying processes while matching and adjusting the formulas of the water-based paint and the oil-based paint, and does not need to modify the equipment environment. The risk brought by synchronous introduction of double coatings is reduced. The use of organic solvents in the roll spraying process is reduced, and the VOC emission in a spraying workshop is reduced by more than 50 percent. Meanwhile, the yield is high.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a water-based paint spraying process.
Background
The reduction of the total pollutant emissions places higher demands on the VOC emissions of spray paint products, requiring a wider range of aqueous paints to replace oily paints.
Taking zinc alloy pull head paint spraying as an example, the prior art mainly has the following defects: 1. the existing water paint spraying technology needs to simultaneously perform water-based substitution on machine spraying (rolling spraying) and hand spraying (mechanical hand spraying), and has high complexity; 2. the water-based modification of the hand spraying (mechanical hand spraying) process needs to be performed with constant temperature and constant humidity and dust-free spray booth modification, and larger equipment and capital investment are needed; 3. the hand spraying (mechanical hand spraying) needs to establish a matched tunnel furnace to control the wind speed; 4. the original wastewater treatment system needs to be modified by hand spraying (mechanical hand spraying).
Therefore, in order to reduce the difficulty of introducing the water-based paint and reduce the waste of resources, it is very necessary to develop a water-based paint spraying process.
Disclosure of Invention
In view of the above, the technical problem to be solved by the invention is to provide a water-based paint spraying process, which does not need to modify the equipment environment, and has the advantages of simple method and high yield.
The invention provides a water-based paint spraying process, which comprises the following steps of:
a) Phosphating the substrate to obtain a phosphatized substrate;
b) Spraying water paint on the phosphatized substrate by adopting a roll spraying machine to obtain a substrate containing a water-based coating;
c) Spraying and baking the substrate containing the water-based coating by using the oil paint; obtaining the product.
Preferably, the roll spraying parameters of the roll spraying machine in the step B) are as follows:
the spraying temperature is 95-105 ℃, the spraying interval is 3s, the single time duration is 6s, and the rolling speed of the roller is 30rad/min;
the air pressure is 0.4MPa; the viscosity of the water paint is 9s; the spraying time is 10-20 min.
Preferably, the substrate after the phosphating treatment in the step B) is subjected to preheating treatment before the roll spraying, and the preheating temperature is 90-95 ℃;
the phosphating treatment specifically comprises the following steps: mixing the substrate with the phosphating agent, soaking for 10-15 min, washing with clear water, and drying.
Preferably, the aqueous paint comprises an aqueous paint, a curing agent and water; the mass ratio of the water-based paint to the curing agent to the water is 3:1:2-4;
the curing agent is triethylene tetramine.
Preferably, the water-based paint comprises the following raw materials:
45-65 wt% of water-based epoxy resin;
10-20wt% of modified solid epoxy resin;
5-10wt% of defoaming agent;
5-30wt% of color paste;
10-30wt% of deionized water;
DMEA 0.5wt％～2wt％；
the aqueous epoxy resin is bisphenol F type aqueous epoxy resin;
the modified solid epoxy resin is acrylic acid modified epoxy resin or polyester modified epoxy resin;
the defoamer is selected from mineral oil defoamers;
the color paste is selected from water-based dispersion color paste;
preferably, the oily paint of step C) comprises an oily paint and a curing agent; the mass ratio of the oil paint to the curing agent is 1:1;
the curing agent is polyamide.
Preferably, the oil paint comprises the following raw materials:
50-70 wt% of epoxy resin;
1 to 3 weight percent of sodium sulfonate;
10-30wt% of organic solvent;
0.1 to 5 weight percent of diethylene glycol butyl ether;
0.1 to 5 weight percent of wetting and leveling agent;
the epoxy resin is bisphenol A type epoxy resin;
the organic solvent is tena water;
the wetting leveling agent is an organosilicon leveling agent;
preferably, the spraying parameters in the step C) are specifically:
the viscosity of the oil paint is 12s, the molding air of the spray gun is 0.4Mpa, the opening of the needle is two circles, the gun distance is 20-25 cm, the spraying times are 1-2 times, and the leveling is 10-15 min.
Preferably, the baking temperature is 130 ℃ and the baking time is 30min.
Preferably, the substrate is a zinc alloy pull head injection molding piece.
Compared with the prior art, the invention provides a water-based paint spraying process, which comprises the following steps: a) Phosphating the substrate to obtain a phosphatized substrate; b) Spraying water paint on the phosphatized substrate by adopting a roll spraying machine to obtain a substrate containing a water-based coating; c) Spraying and baking the substrate containing the water-based coating by using the oil paint; obtaining the product. The invention optimizes the rolling spraying and hand spraying processes while matching and adjusting the formulas of the water-based paint and the oil-based paint, and does not need to modify the equipment environment. The risk brought by synchronous introduction of double coatings is reduced. The use of organic solvents in the roll spraying process is reduced, and the VOC emission in a spraying workshop is reduced by more than 50 percent. Meanwhile, the yield is high.
Drawings
FIG. 1 is a diagram showing the results of a slider prepared according to an embodiment of the present invention; from left to right are example 1, example 2, example 3, example 4;
FIG. 2 is a sample defect of comparative example 1;
FIG. 3 is a graph showing the results of a slider prepared according to a comparative example of the present invention; from left to right are comparative example 1, comparative example 2, comparative example 3.
Detailed Description
The invention provides a water-based paint spraying process, and a person skilled in the art can properly improve the process parameters by referring to the content of the water-based paint spraying process. It is expressly noted that all such similar substitutions and modifications will be apparent to those skilled in the art, and they are intended to be within the scope of the present invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those skilled in the relevant art that the invention can be practiced and practiced with modification and alteration and combination of the methods and applications herein without departing from the spirit and scope of the invention.
The invention provides a water-based paint spraying process, which comprises the following steps of:
a) Phosphating the substrate to obtain a phosphatized substrate;
b) Spraying water paint on the phosphatized substrate by adopting a roll spraying machine to obtain a substrate containing a water-based coating;
c) Spraying and baking the substrate containing the water-based coating by using the oil paint; obtaining the product.
The invention provides a water-based paint spraying process, which comprises the steps of firstly, phosphating a substrate to obtain the phosphatized substrate.
The substrate comprises a metal substrate or a plastic substrate; including but not limited to zinc alloy slider injection molding.
The phosphating treatment of the invention comprises the following steps: mixing the substrate with the phosphating agent, soaking for 10-15 min, washing with clear water, and drying.
Wherein the mass ratio of the substrate to the phosphating agent is 1:20.
The substrate after phosphating is subjected to preheating treatment before rolling spraying, and the preheating temperature is 90-95 ℃; preferably 95 ℃.
And spraying water paint on the phosphatized substrate by adopting a roll spraying machine to obtain the substrate containing the water-based coating.
The invention is not limited to the roll-spraying machine used and WA-200 spray guns well known to those skilled in the art may be used.
According to the invention, the rolling spraying parameters of the rolling spraying machine are as follows:
the spraying temperature is 95-105 ℃, the spraying interval is 3s, the single time duration is 6s, and the rolling speed of the roller is 30rad/min;
the air pressure is 0.4MPa; the viscosity of the water paint is 9s; the spraying time is 10-20 min.
And adjusting the angle of the spray gun to enable the spraying center to be opposite to the center of the sample for spraying.
And stopping spraying after spraying, rapidly taking out the sample, cooling the sample for standby, and preferably orderly placing the sample obtained by rolling spraying on a formulated hanger.
The water paint comprises water paint, a curing agent and water; the mass ratio of the water-based paint to the curing agent to the water is 3:1:2-4;
the curing agent is triethylene tetramine; the curing agent solution is triethylene tetramine dissolved in deionized water.
The water-based paint provided by the invention comprises the following raw materials:
45-65 wt% of water-based epoxy resin;
10-20wt% of modified solid epoxy resin;
5-10wt% of defoaming agent;
5-30wt% of color paste;
10-30wt% of deionized water;
DMEA 0.5wt％～2wt％；
in a part of the preferred embodiment of the present invention, the aqueous coating comprises the following raw materials:
45-63 wt% of water-based epoxy resin;
12-18 wt% of modified solid epoxy resin;
6-9 wt% of defoaming agent;
5-30wt% of color paste;
12-28 wt% of deionized water;
DMEA 0.8wt％～1.8wt％；
specifically, the aqueous epoxy resin is preferably bisphenol F type aqueous epoxy resin;
the modified solid epoxy resin is preferably acrylic modified epoxy resin or polyester modified epoxy resin;
the defoamer is preferably selected from mineral oil defoamers; can be specifically used as an organosilicon defoamer
The color paste is preferably selected from aqueous dispersion color paste; in particular to water-dispersible titanium dioxide.
The sources of the above components are not limited in the present invention, and the present invention is commercially available.
And spraying the oily paint on the substrate containing the water-based coating. The spraying includes, but is not limited to, hand spraying.
The oil paint comprises an oil paint and a curing agent; the mass ratio of the oil paint to the curing agent is 1:1;
the curing agent is polyamide; the curing agent solution is prepared by dissolving polyamide in n-butanol or xylene.
According to the invention, the oil paint comprises the following raw materials:
50-70 wt% of epoxy resin;
1 to 3 weight percent of sodium sulfonate;
10-30wt% of organic solvent;
6-20wt% of color paste;
0.1 to 5 weight percent of diethylene glycol butyl ether;
0.1 to 5 weight percent of wetting and leveling agent;
in a preferred embodiment of a part of the present invention, the oil paint comprises the following raw materials:
52-68% of epoxy resin;
1.5 to 2.5 weight percent of sodium sulfonate;
12-28 wt% of organic solvent;
6-20wt% of color paste;
0.5 to 4.5 weight percent of diethylene glycol butyl ether;
0.5 to 4.5 weight percent of wetting and leveling agent;
the epoxy resin is bisphenol A type epoxy resin;
the organic solvent is tena water;
the wetting leveling agent is an organosilicon leveling agent; specifically, polyether modified organosiloxane is used.
The spraying parameters of the invention are specifically as follows:
the viscosity of the oil paint is 12s, the molding air of the spray gun is 0.4Mpa, the opening of the needle is two circles, the gun distance is 20-25 cm, the spraying times are 1-2 times, and the leveling is 10-15 min.
And baking after spraying, wherein the baking temperature is 130 ℃ and the baking time is 30min.
According to the invention, the formulas of the water-based paint and the oil-based paint are matched and adjusted, and simultaneously, the rolling spraying and hand spraying processes are optimized, so that the requirement on the color precision of the water-based rolling spraying as the primer is low, the workload of manual color mixing is reduced, and the production efficiency is improved. The double-coating process of the water-based rolling spray matched solvent type hand spray reduces the use of organic solvents in the rolling spray process, and reduces VOC emission in a spraying workshop by more than 50%. The introduced water-based rolling spraying process is the same as the solvent-type spraying process, and the equipment environment does not need to be modified. The scheme adopts a single-coating and single-process introduction scheme, and reduces risks caused by synchronous introduction of double coatings.
In order to further illustrate the present invention, a detailed description of a water-based paint spraying process is provided below with reference to examples.
Example 1
1. Raw materials: phosphating zinc alloy pull head, water-based black paint roller, water-based paint roller curing agent, solvent-based black hand paint roller, solvent-based hand paint roller curing agent, water, paint roller (WA-200 spray gun), manual spray gun (W-101), oven and rock field No. 2 cup.
(1) Formula of water-based rolling paint
a. And (3) coating: curing agent: water=3:1:2
b. 50wt% of aqueous epoxy resin
c. 15wt% of modified solid epoxy resin
d. 6wt% of defoaming agent
e. 13wt% of color paste
f. Deionized water 15wt%
g、DMEA 1wt％
(2) Solvent type hand spray paint formula
a. And (3) coating: curing agent = 1:1
b. 70wt% of epoxy resin
c. Sodium sulfonate 1wt
d. 17.9wt% of organic solvent
e. Color paste 8wt%
f. Diethylene glycol butyl ether 3wt%
g. Wetting leveling agent 0.1wt%
2. And (3) setting parameters of a rolling spraying machine: spraying temperature 100 ℃, spraying interval 3s, single time duration 6s, roller rolling speed 30rad/min
3. 4kg of phosphating substrate is preheated to 95 ℃, 150g of water-based paint roller and curing agent are mixed according to a ratio of 3:1, uniformly stirred, 100g of tap water is added, uniformly stirred, the paint viscosity is 9s, the air pressure is 0.4MPa, and the angle of a spray gun is regulated, so that the spraying center is directly opposite to the sample center for spraying
4. Stopping spraying after the paint is sprayed for 20min, and rapidly taking out the sample and cooling for later use
5. Orderly placing the obtained samples on a formulated hanger
6. 100g of oily hand spray paint and a curing agent are uniformly mixed according to a ratio of 1:1, the viscosity of the hand spray paint is 12s, the molding air of a hand spray gun is 0.4Mpa, the opening degree of a needle is two circles, the gun distance is 20cm, a rolling spray sample is sprayed for 2 times, the leveling is 10min, the baking temperature is 130 ℃, and the baking is 30min
Example 2
1. Raw materials: phosphating zinc alloy pull head, water-based black paint rolling, water-based paint rolling curing agent, water-based black hand paint rolling curing agent, water-based hand paint rolling curing agent, water, a rolling machine (WA-200 spray gun), a manual spray gun (W-101), an oven and a rock field No. 2 cup.
(1) Formula of water-based rolling paint
a. And (3) coating: curing agent: water=3:1:2
b. 50wt% of aqueous epoxy resin
c. 15wt% of modified solid epoxy resin
d. 6wt% of defoaming agent
e. 13wt% of color paste
f. Deionized water 15wt%
g、DMEA 1wt％
(2) Solvent type hand spray paint formula
a. And (3) coating: curing agent = 1:1
b. 70wt% of epoxy resin
c. Sodium sulfonate 1wt
d. Organic solvent 19.9wt%
e. Color paste 8wt%
f. Diethylene glycol butyl ether 0.1wt%
g. Wetting leveling agent 1wt%
2. And (3) setting parameters of a rolling spraying machine: spraying temperature 100 ℃, spraying interval 3s, single time duration 6s, roller rolling speed 30rad/min
3. 4kg of phosphating substrate is preheated to 95 ℃, 150g of water-based paint roller and curing agent are mixed according to a ratio of 3:1, uniformly stirred, 100g of tap water is added, uniformly stirred, the paint viscosity is 9s, the air pressure is 0.4MPa, and the angle of a spray gun is regulated, so that the spraying center is directly opposite to the sample center for spraying
4. Stopping spraying after the paint is sprayed for 20min, and rapidly taking out the sample and cooling for later use
5. Orderly placing the obtained samples on a formulated hanger
6. 100g of oily hand spray paint and a curing agent are uniformly mixed according to a ratio of 1:1, the viscosity of the hand spray paint is 12s, the molding air of a hand spray gun is 0.4Mpa, the opening degree of a needle is two circles, the gun distance is 20cm, a rolling spray sample is sprayed for 2 times, the leveling is 10min, the baking temperature is 130 ℃, and the baking is 30min
Example 3
1. Raw materials: phosphating zinc alloy pull head, water-based black paint rolling, water-based paint rolling curing agent, water-based black hand paint rolling curing agent, water-based hand paint rolling curing agent, water, a rolling machine (WA-200 spray gun), a manual spray gun (W-101), an oven and a rock field No. 2 cup.
(1) Formula of water-based rolling paint
a. And (3) coating: curing agent: water=3:1:2
b. 46wt% of aqueous epoxy resin
c. 13wt% of modified solid epoxy resin
d. Defoaming agent 5wt%
e. Color paste 25wt%
f. Deionized water 10wt%
g、DMEA 1wt％
(2) Solvent type hand spray paint formula
a. And (3) coating: curing agent = 1:1
b. 70wt% of epoxy resin
c. Sodium sulfonate 1wt
d. Organic solvent 19.9wt%
e. Color paste 8wt%
f. Diethylene glycol butyl ether 0.1wt%
g. Wetting leveling agent 1wt%
2. And (3) setting parameters of a rolling spraying machine: spraying temperature 100 ℃, spraying interval 3s, single time duration 6s, roller rolling speed 30rad/min
3. 4kg of phosphating substrate is preheated to 95 ℃, 150g of water-based paint roller and curing agent are mixed according to a ratio of 3:1, uniformly stirred, 100g of tap water is added, uniformly stirred, the paint viscosity is 9s, the air pressure is 0.4MPa, and the angle of a spray gun is regulated, so that the spraying center is directly opposite to the sample center for spraying
4. Stopping spraying after the paint is sprayed for 20min, and rapidly taking out the sample and cooling for later use
5. Orderly placing the obtained samples on a formulated hanger
6. 100g of oily hand spray paint and a curing agent are uniformly mixed according to a ratio of 1:1, the viscosity of the hand spray paint is 12s, the molding air of a hand spray gun is 0.4Mpa, the opening degree of a needle is two circles, the gun distance is 20cm, a rolling spray sample is sprayed for 2 times, the leveling is 10min, the baking temperature is 130 ℃, and the baking is 30min
Example 4
1. Raw materials: phosphating zinc alloy pull head, water-based black paint rolling, water-based paint rolling curing agent, water-based black hand paint rolling curing agent, water-based hand paint rolling curing agent, water, a rolling machine (WA-200 spray gun), a manual spray gun (W-101), an oven and a rock field No. 2 cup.
(1) Formula of water-based rolling paint
a. And (3) coating: curing agent: water=3:1:2
b. 46wt% of aqueous epoxy resin
c. 13wt% of modified solid epoxy resin
d. Defoaming agent 5wt%
e. Color paste 25wt%
f. Deionized water 10wt%
g、DMEA 1wt％
(2) Solvent type hand spray paint formula
a. And (3) coating: curing agent = 1:1
b. 70wt% of epoxy resin
c. Sodium sulfonate 1wt
d. 17.9wt% of organic solvent
e. Color paste 8wt%
f. Diethylene glycol butyl ether 3wt%
g. Wetting leveling agent 0.1wt%
2. And (3) setting parameters of a rolling spraying machine: spraying temperature 100 ℃, spraying interval 3s, single time duration 6s, roller rolling speed 30rad/min
3. 4kg of phosphating substrate is preheated to 95 ℃, 150g of water-based paint roller and curing agent are mixed according to a ratio of 3:1, uniformly stirred, 100g of tap water is added, uniformly stirred, the paint viscosity is 9s, the air pressure is 0.4MPa, and the angle of a spray gun is regulated, so that the spraying center is directly opposite to the sample center for spraying
4. Stopping spraying after the paint is sprayed for 20min, and rapidly taking out the sample and cooling for later use
5. Orderly placing the obtained samples on a formulated hanger
6. 100g of oily hand spray paint and a curing agent are uniformly mixed according to a ratio of 1:1, the viscosity of the hand spray paint is 12s, the molding air of a hand spray gun is 0.4Mpa, the opening degree of a needle is two circles, the gun distance is 20cm, a rolling spray sample is sprayed for 2 times, the leveling is 10min, the baking temperature is 130 ℃, and the baking is 30min
Comparative example 1
Water-based rolling spraying matching oily hand spraying (comparison of different formulas)
1. Raw materials: phosphating zinc alloy pull head, water-based black paint roller, water-based paint roller curing agent, solvent-based black paint roller, solvent-based paint roller curing agent, water, paint roller (WA-200 spray gun), manual spray gun (W-101), oven and rock field No. 2 cup
2. And (3) setting parameters of a rolling spraying machine: spraying temperature 100+/-5 ℃, spraying interval 3s, single time duration 6s and roller rolling speed 30rad/min
3. 4kg of phosphating substrate is preheated to 95 ℃, 150g of water-based paint roller and curing agent are mixed according to a ratio of 3:1, uniformly stirred, 100g of tap water is added, uniformly stirred, the paint viscosity is 9s, the air pressure is 0.4MPa, and the angle of a spray gun is regulated, so that the spraying center is directly opposite to the sample center for spraying
4. Stopping spraying after the paint is sprayed for 20min, and rapidly taking out the sample and cooling for later use
5. Orderly placing the obtained samples on a formulated hanger
6. 100g of oily hand spray paint and a curing agent are uniformly mixed according to a ratio of 1:1, the viscosity of the hand spray paint is 12s, the molding air of a hand spray gun is 0.4Mpa, the opening of a needle is two circles, the gun distance is 20-25 cm, a spray rolling spray sample is sprayed for 1-2 times, the leveling is 10-15 min, the baking temperature is 130 ℃, and the baking is 30min
(1) Formula of water-based rolling paint
a. And (3) coating: curing agent: water=3:1:2
b. 45-65wt% of water-based epoxy resin
c. 10 to 20 percent of modified solid epoxy resin
d. 5 to 10 percent of defoaming agent
e. Color paste 5-30wt%
f. 10 to 30 percent of deionized water
g、DMEA 0.5wt％～2wt％
(2) Solvent type hand spray paint formula
a. And (3) coating: curing agent = 1:1
b. 50 to 70 percent of epoxy resin
c. Sodium sulfonate 1-3 wt%
d. 10 to 30 percent of organic solvent by weight
e. 6-20wt% of color paste;
comparative example 2
Oily hand spray matched with oily rolling spray
1. Raw materials: phosphating zinc alloy pull head, solvent type black paint rolling, solvent type paint rolling curing agent, solvent type black hand paint rolling, solvent type hand paint rolling curing agent, paint rolling machine (WA-200 spray gun), hand spray gun (W-101), oven, rock field No. 2 cup
2. And (3) setting parameters of a rolling spraying machine: spraying temperature 100+/-5 ℃, spraying interval 3s, single time duration 6s and roller rolling speed 30rad/min
3. 4kg of phosphating substrate is preheated to 95 ℃, 150g of solvent type black hand spray paint is mixed with a curing agent according to a ratio of 1:1, the viscosity of the paint is 10s, the air pressure is 0.4MPa, and the angle of a spray gun is regulated to enable a spray center to face the center of a sample for spray coating
4. Stopping spraying after the paint is sprayed for 20min, and rapidly taking out the sample and cooling for later use
5. Orderly placing the obtained samples on a formulated hanger
6. 100g of hand spray paint and a curing agent are uniformly mixed according to a ratio of 1:1, the viscosity of the hand spray paint is 12s, the molding air of a hand spray gun is 0.4Mpa, the opening degree of a needle is two circles, the gun distance is 20-25 cm, a spray rolling spray sample is sprayed for 1-2 times, the leveling is 10-15 min, the baking temperature is 130 ℃, and the baking is 30min
(1) Solvent type rolling spray paint formula
a. And (3) coating: curing agent = 1:1
b. 50 to 70 percent of epoxy resin
c. Sodium sulfonate 1-3 wt%
d. 10 to 30 percent of organic solvent by weight
e. 6-20wt% of color paste;
(2) Solvent type hand spray paint formula
a. And (3) coating: curing agent = 1:1
b. 50 to 70 percent of epoxy resin
c. Sodium sulfonate 1-3 wt%
d. 10 to 30 percent of organic solvent by weight
e. 6-20wt% of color paste;
(3) Solvent type hand spraying curing agent
a. 50 to 60 percent of polyether amine by weight
b. 5 to 15 percent of n-butyl alcohol by weight
c. Propylene glycol methyl ether 5-15 wt%
d. 20 to 30 percent of butyl acetate
Comparative example 3
Water-based rolling spraying matched water-based hand spraying
1. Raw materials: phosphating zinc alloy pull head, water-based black paint roller, water-based paint roller curing agent, water-based black hand paint roller, water-based hand paint roller curing agent, water-based hand paint roller (WA-200 spray gun), manual spray gun (W-101), oven and rock field No. 2 cup
2. And (3) setting parameters of a rolling spraying machine: spraying temperature 100+/-5 ℃, spraying interval 3s, single time duration 6s and roller rolling speed 30rad/min
3. 4kg of phosphating substrate is preheated to 95 ℃, 150g of water-based paint roller and curing agent are mixed according to a ratio of 3:1, uniformly stirred, 100g of tap water is added, uniformly stirred, the paint viscosity is 9s, the air pressure is 0.4MPa, and the angle of a spray gun is regulated, so that the spraying center is directly opposite to the sample center for spraying
4. Stopping spraying after the paint is sprayed for 20min, and rapidly taking out the sample and cooling for later use
5. Orderly placing the obtained samples on a formulated hanger
6. 100g of hand spray paint, 12s of viscosity of finish paint, 0.4Mpa of molding air of a hand spray gun, 20-25 cm of gun distance, 1-2 times of spray rolling and spray coating of a sample, 10-15 minutes of leveling, 5 minutes of preheating at 80 ℃ and 30 minutes of baking at 130 ℃.
(1) Formula of water-based rolling paint
a. And (3) coating: curing agent: water=3:1:2
b. 45-65wt% of water-based epoxy resin
c. 10 to 20 percent of modified solid epoxy resin
d. 5 to 10 percent of defoaming agent
e. Color paste 5-30wt%
f. 10 to 30 percent of deionized water
g、DMEA 0.5wt％～2wt％
(2) Formula of water-based hand-spraying paint
a. And (3) coating: curing agent: water=5:1:2
b. 45-65wt% of water-based epoxy resin
c. 10 to 20 percent of modified solid epoxy resin
d. 5 to 10 percent of defoaming agent
e. Color paste 5-30wt%
f. 10 to 30 percent of deionized water
g、DMEA 0.5wt％～2wt％
Verification example:
1.1 yield contrast
The yield of the aqueous rolling spray matched solvent hand spray process in comparative example 1 is less than 50%, which is far lower than that of the examples, mainly because the surface of the sample has a high probability of coating defects, and the appearance of the coating defects is poor in local painting as shown in figure 2.
1.2 appearance the embodiment of figures 1 and 3 is exceptionally superior to comparative example 1
| Category(s) | Surface state of coating film |
| Comparative example 1 | Surface roughness |
| Example 1 | Surface leveling |
| Example 2 | Surface leveling |
| Example 3 | Surface leveling |
| Example 4 | Surface leveling |
1.3 comparison of the solids of the coating after mixing of the curing agent (1 g sample, 120 ℃ C. 1 min)
| Category(s) | Solid part of paint roller | Solid part for hand painting |
| Comparative example 2 | 33.5％ | 37.5％ |
| Example 1 | 27.2％ | 37.5％ |
| Example 2 | 27.2％ | 37.1％ |
| Example 3 | 32.5％ | 37.1％ |
| Example 4 | 32.5％ | 37.5％ |
The portion of comparative example 2, from which the solid was removed, was an organic solvent, expressed as VOC gas, accounting for about 66.7% of the entire paint, with examples 1, 2, 3, and 4 mainly discharging water vapor and less than 5% of the solvent, with little environmental impact. .
1.4 Equipment and spray Environment requirements
Comparative example 3 requires more equipment investment in the hand spraying stage than the example, and is higher in cost and increased in risk.
1.5 wastewater treatment
Comparative example 3 has greater difficulty in wastewater treatment at the hand spraying stage and higher treatment cost.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The water paint spraying process is characterized by comprising the following steps:
a) Phosphating the substrate to obtain a phosphatized substrate;
b) Spraying water paint on the phosphatized substrate by adopting a roll spraying machine to obtain a substrate containing a water-based coating;
c) Spraying and baking the substrate containing the water-based coating by using the oil paint; obtaining the product.
2. The process of claim 1, wherein the roll-spray parameters of step B) are:
the spraying temperature is 95-105 ℃, the spraying interval is 3s, the single time duration is 6s, and the rolling speed of the roller is 30rad/min;
the air pressure is 0.4MPa; the viscosity of the water paint is 9s; the spraying time is 10-20 min.
3. The process according to claim 1, wherein the substrate after phosphating in step B) is subjected to a preheating treatment before tumble-spraying, the preheating temperature being 90-95 ℃;
the phosphating treatment specifically comprises the following steps: mixing the substrate with the phosphating agent, soaking for 10-15 min, washing with clear water, and drying.
4. The process of claim 1, wherein the aqueous paint comprises an aqueous coating, a curing agent, and water; the mass ratio of the water-based paint to the curing agent to the water is 3:1:2-4;
the curing agent is triethylene tetramine.
5. The process of claim 4 wherein the aqueous coating comprises the following materials:
45-65 wt% of water-based epoxy resin;
10-20wt% of modified solid epoxy resin;
5-10wt% of defoaming agent;
5-30wt% of color paste;
10-30wt% of deionized water;
DMEA 0.5wt％～2wt％；
the aqueous epoxy resin is bisphenol F type aqueous epoxy resin;
the modified solid epoxy resin is acrylic acid modified epoxy resin or polyester modified epoxy resin;
the defoaming agent is mineral oil defoaming agent;
the color paste is selected as water-based dispersion color paste.
6. The process according to claim 1, wherein the oily paint of step C) comprises an oily paint and a curing agent; the mass ratio of the oil paint to the curing agent is 1:1;
the curing agent is polyamide.
7. The process of claim 6 wherein the oil coating comprises the following materials:
50-70 wt% of epoxy resin;
1 to 3 weight percent of sodium sulfonate;
10-30wt% of organic solvent;
0.1 to 5 weight percent of diethylene glycol butyl ether;
0.1 to 5 weight percent of wetting and leveling agent;
the epoxy resin is bisphenol A type epoxy resin;
the organic solvent is tena water;
the wetting leveling agent is an organosilicon leveling agent.
8. The process according to claim 1, characterized in that the spraying parameters of step C) are in particular:
the viscosity of the oil paint is 12s, the molding air of the spray gun is 0.4Mpa, the opening of the needle is two circles, the gun distance is 20-25 cm, the spraying times are 1-2 times, and the leveling is 10-15 min.
9. The process according to claim 1, wherein the baking temperature is 130 ℃ and the baking is for 30min.
10. The process of claim 1 wherein the substrate is a zinc alloy slider injection molded part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211520652.9A CN116020724A (en) | 2022-11-30 | 2022-11-30 | Water-based paint spraying process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211520652.9A CN116020724A (en) | 2022-11-30 | 2022-11-30 | Water-based paint spraying process |
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| CN116020724A true CN116020724A (en) | 2023-04-28 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107236427A (en) * | 2017-07-07 | 2017-10-10 | 珠海富邦新材料科技有限公司 | Aqueous rolling spray pull head paint and preparation method and application |
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- 2022-11-30 CN CN202211520652.9A patent/CN116020724A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107236427A (en) * | 2017-07-07 | 2017-10-10 | 珠海富邦新材料科技有限公司 | Aqueous rolling spray pull head paint and preparation method and application |
Non-Patent Citations (1)
| Title |
|---|
| 叶扬祥等: "涂装技术实用手册", vol. 1, 西南交通大学出版社, pages: 465 * |
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