CN105315813A - Water-based automobile metal base coat and preparing method thereof - Google Patents

Abstract

The invention relates to a water-based automotive metal base paint and a preparation method, which is composed of the following raw materials in parts by weight: 30-40 parts of water-based acrylic emulsion, 5-10 parts of water-based aluminum silver paste, 0.3-1 part of dispersant, auxiliary 3-6 parts of solvent, 0.3-1 part of defoamer, 0.4-1 part of leveling agent, 7-12 parts of thickener, 1.5-3.5 parts of anti-settling agent, 0.02-0.05 part of pH regulator and 35 parts of deionized water ~45 servings. The water-based automotive metal base paint of the present invention basically has no smell after opening the can, and is diluted with clean tap water during construction, belongs to non-hazardous chemicals, and the environmental index does not contain benzene, heavy metals and high-content chemicals. Toxic and harmful substances such as VOC. Therefore, the present invention is more targeted, and has a wider market demand and prospect than oil-based products.

Description

Water-based automotive metal base paint and preparation method thereof

technical field

The invention relates to the technical field of environmental protection coatings, in particular to a water-based automotive metal base paint and a preparation method thereof.

Background technique

According to statistics released by the National Bureau of Statistics, the total output of China's coatings in 2014 reached 16.48188 million tons, an increase of 7.87% year-on-year after adjustment. Compared with the 13,033,490 tons of total paint output in 2013, a new increase of 3,448,390 tons was added in 2014. Another record high. Among them, the annual coating output in Guangdong Province was 3.3399 million tons, a year-on-year increase of 6.92%, the annual coating output in Shanghai was 1.8709 million tons, a year-on-year increase of 10.54%, and the annual coating output in Jiangsu Province was 1.8215 million tons, a year-on-year increase of 5.43%. Based on the output in 2013, if oil-based paint is used, the total annual atmospheric VOC emissions will be 1145 tons, while after water-based paint is used, the total annual VOC emissions will be only 19 tons, a drop of up to 98%. The effect of haze reduction is huge; secondly, the efficiency of spraying has been greatly improved. The efficiency of oil-based paint spraying was only 35% to 40% before, but now the efficiency of water-based paint spraying has jumped to more than 79%, which not only effectively reduces costs but also reduces environmental pollution. ; With the popularization of the concept of environmental protection, water-based coatings have been recognized by more and more consumers as products with environmental protection properties. On January 16, 2015, the Ministry of Finance and the State Taxation Bureau jointly issued the "Notice on Levying Consumption Tax on Batteries and Coatings". The environmental protection and water-based coatings are unstoppable and have broad market prospects.

Contents of the invention

The purpose of the present invention is to solve the deficiencies of the above technical problems, to provide a water-based automotive metal base paint and a preparation method thereof, which is non-toxic, non-combustible, does not contain benzene series, has no pollution to the environment, and is environmentally friendly. The construction personnel are healthy and harmless, and it is safe and convenient to use.

The present invention solves the deficiencies of the above-mentioned technical problems, and the adopted technical solution is: a water-based automotive metal base paint, which is composed of the following raw materials in parts by weight: 30-40 parts of water-based acrylic emulsion, 5-5 parts of water-based aluminum silver paste 10 parts, 0.3-1 part of dispersant, 3-6 parts of co-solvent, 0.3-1 part of defoamer, 0.4-1 part of leveling agent, 7-12 parts of thickener, 1.5-3.5 parts of anti-settling agent, pH 0.02-0.05 parts of conditioner and 35-45 parts of deionized water.

As a further improvement of the water-based automotive metal base paint of the present invention: the above-mentioned water-based acrylic emulsion is one or any mixture of water-based acrylic resin and water-based acrylic polyurethane dispersion.

As a further improvement of a kind of water-based automotive metal base paint of the present invention: the above-mentioned water-based aluminum-silver paste is a non-leafing aluminum-silver paste, the particle size of the aluminum-silver powder of the aluminum-silver paste is 5-80 microns, and the shape of the aluminum-silver paste is popcorn type or silver round type.

As a further improvement of a kind of water-based automotive metal base paint of the present invention: the above-mentioned dispersant is modified polyacrylate polymer, modified polyacrylate and vinyl copolymer, alkanolamine salt of high molecular weight carboxylic acid, fatty acid A mixture of one or more than two kinds of modified polyesters in any ratio.

As a further improvement of a water-based automotive metal base paint of the present invention: the above-mentioned defoamer is a water-based emulsion defoamer containing organosilicon modification, organically modified polydimethylsiloxane, vinyl copolymer, A mixture of one or more than two kinds of vinyl polymers in any ratio.

As a further improvement of a kind of water-based automotive metal base paint of the present invention: the above-mentioned cosolvent is a kind of in ethylene glycol butyramide, propylene glycol methyl ether, PMA, DBE, ethanol, butanol, isopropanol, methyl ethyl ketone, acetone Or any mixture of two or more.

As a further improvement of a water-based automotive metal base paint of the present invention: the above-mentioned leveling agent is a polyether modified silicone polymer, a polyether modified silicone, a modified polysiloxane emulsion, a fluorocarbon modified primer and one or more mixtures of polyacrylate aqueous solution, acrylic acid-silicon copolymer in any ratio.

As a further improvement of the water-based automotive metal base paint of the present invention: the above-mentioned thickener is an associative polyurethane thickener, alkali-swellable acrylic polyurethane or cellulose thickener.

As a further improvement of the water-based automotive metal base paint of the present invention: the anti-settling agent polyamide wax ammonium salt or organic bentonite; the pH regulator is dimethylethanolamine, ammonia or triethylamine.

The preparation method of above-mentioned water-based automotive metal base paint: comprises the following steps:

(1) Take 30-40 parts by weight of water-based acrylic emulsion, 5-10 parts of water-based aluminum silver paste, 0.3-1 part of dispersant, 3-6 parts of co-solvent, 0.3-1 part of defoamer, leveling 0.4-1 part of agent, 7-12 parts of thickener, 1.5-3.5 parts of anti-sedimentation agent, 0.02-0.05 part of pH regulator and 35-45 parts of deionized water, set aside;

(2), mix and stir the dispersant, co-solvent, water-based aluminum silver paste and 5 parts of deionized water evenly, soak for 15-20 minutes, and obtain component A for later use;

(3) Mix the water-based acrylic emulsion, defoamer, leveling agent, thickener, anti-sedimentation agent and the remaining deionized water evenly, and stir evenly under low shear force to obtain component B, which is set aside;

(4) Component B is stirred at a low speed (stirring speed does not exceed 100r/min), and component A is added while stirring, and stirred evenly to obtain component C, which is set aside;

(5) Use a pH regulator to adjust the pH value of component C to 7.5-8.5 to obtain an environmentally friendly aluminum powder paint.

The method of using the water-based automotive metal base paint of the present invention is: first stir the aluminum powder paint evenly during construction, dilute it with 5-15% deionized water or drinking tap water, and then spray evenly on the workpiece to be coated according to the construction requirements .

Beneficial effect

Compared with oil-based paint, water-based automotive metal base paint of the present invention has the following advantages:

(1) The coating of the present invention adopts water-dispersible acrylic emulsion, which can give the excellent decorative and film-forming properties of the paint film;

(2) coating of the present invention possesses good flexibility, can prevent cracking of paint film, comes off;

(3) The coating of the present invention has outstanding moisture resistance, and can be directly coated and constructed in wet surfaces and humid environments;

(4) coating of the present invention has good workability, has eliminated fire hazard during construction;

(5) The coating of the present invention uses water as a solvent, which saves a lot of resources and can reduce air pollution;

(6) coating of the present invention only adopts a small amount of low toxicity alcohol ether organic solvents, has improved working environment condition;

(7) The coating tool of the present invention can be cleaned with water, which greatly reduces the consumption of cleaning solvents.

The water-based automotive metal base paint coating of the present invention can basically smell no smell after opening the can, and is diluted with clean tap water during construction, belongs to non-hazardous chemicals, and the environmental protection index does not contain benzene, heavy metals and high content VOC and other toxic and harmful substances. Therefore, the present invention is more targeted, and has a wider market demand and prospect than oil-based products.

detailed description

The following examples serve to further illustrate but not limit the present invention.

Example 1

A kind of water-based automotive metallic base paint, is made up of the raw material of following parts by weight: 30 parts of water-based acrylic emulsion (E-125 of DSM company), 8 parts of water-based aluminum-silver paste (SBCAQJ6811B5B of Star Platinum Company), dispersant 0.5 parts (AFCONA6226), 4 parts of co-solvent (isopropanol), 0.6 parts of defoamer (water-based emulsion defoamer AFCONA2501 containing silicone), 0.6 parts of leveling agent (acrylic acid-silicone copolymer AQ-7130 ), 9 parts of thickener (BASF's HV-30), 2 parts of anti-settling agent (polyamide wax salt AQ607), 0.05 part of pH regulator (dimethylethanolamine) and 35-45 parts of deionized water.

The preparation method of above-mentioned water-based automotive metal base paint is as follows:

(1), take 30 parts by weight of water-based acrylic emulsion (E-125 of DSM Company), 8 parts of water-based aluminum silver paste (SBCAQJ6811B5B of Star Platinum Company), 0.5 part of dispersant (AFCONA6226), 4 parts of cosolvent (isopropanol), 0.6 parts of defoamer (water-based emulsion defoamer AFCONA2501 containing silicone), 0.6 parts of leveling agent (acrylic acid-organic silicon copolymer AQ-7130), 9 parts of thickener (BASF HV-30), 2 parts of anti-settling agent (polyamide wax salt AQ607), 0.05 part of pH regulator (dimethylethanolamine) and 35 parts of deionized water, set aside;

(2), mix and stir the dispersant, co-solvent, water-based aluminum silver paste and 5 parts of deionized water evenly, soak for 15-20 minutes, and obtain component A for later use;

(3) Mix the water-based acrylic emulsion, defoamer, leveling agent, thickener, anti-sedimentation agent and the remaining deionized water evenly, and obtain component B after stirring evenly, and set aside;

(4) Component B is stirred at a low speed (100r/min), and component A is added while stirring, and stirred evenly to obtain component C, which is set aside;

(5) The pH value of component C is adjusted to 7.5 with a pH regulator to obtain a water-based automotive metal base paint.

Example 2

A water-based automotive metal base paint, made up of the following raw materials in parts by weight: 30 parts of water-based acrylic emulsion (water-based acrylic polyurethane dispersion), 10 parts of water-based aluminum silver paste, dispersant (alkanolamine of high molecular weight carboxylic acid) Salt) 0.3 parts, cosolvent (propylene glycol methyl ether) 6 parts, defoamer (aqueous emulsion defoamer) 0.3 parts, leveling agent (modified polysiloxane emulsion) 01 parts, thickener (alkali swelling Acrylic polyurethane) 7 parts, anti-settling agent (organic bentonite) 3.5 parts, pH regulator (ammonia water) 0.02 parts and deionized water 45 parts.

The preparation method of above-mentioned water-based automotive metal base paint is as follows:

(1), 30 parts by weight of water-based acrylic emulsion, 10 parts of water-based aluminum silver paste, 0.3 parts of dispersant, 6 parts of cosolvent, 0.3 part of defoamer, 01 parts of leveling agent, 7 parts of thickener, 3.5 parts of anti-sedimentation agent, 0.02 part of pH regulator and 45 parts of deionized water, set aside;

(2), mix and stir the dispersant, co-solvent, water-based aluminum silver paste and 5 parts of deionized water evenly, soak for 15-20 minutes, and obtain component A for later use;

(3) Mix the water-based acrylic emulsion, defoamer, leveling agent, thickener, anti-sedimentation agent and the remaining deionized water evenly, and obtain component B after stirring evenly, and set aside;

(4) Component B is stirred at a low speed (80r/min), and component A is added while stirring, and stirred evenly to obtain component C, which is set aside;

(5) The pH value of component C is adjusted to 8.5 with a pH regulator to obtain a water-based automotive metal base paint.

Example 3

A water-based automotive metal base paint, consisting of the following raw materials in parts by weight: 40 parts of water-based acrylic emulsion (water-based acrylic resin), 5 parts of water-based aluminum silver paste, 1 part of dispersant (fatty acid modified polyester), auxiliary 3 parts of solvent (DBE), 1 part of defoamer (vinyl copolymer), 0.4 parts of leveling agent (acrylic acid-silicone copolymer), 12 parts of thickener (cellulose thickener), anti-settling agent ( polyamide wax ammonium salt) 1.5 parts, pH regulator 0.05 parts and deionized water 40 parts.

The preparation method of above-mentioned water-based automotive metal base paint is as follows:

(1), get a kind of water-based automotive metal base paint by weight parts, be made up of the raw material of following parts by weight: 40 parts of water-based acrylic emulsion (water-based acrylic resin), 5 parts of water-based aluminum silver paste, dispersant (fatty acid Modified polyester) 1 part, cosolvent (DBE) 3 parts, defoamer (vinyl copolymer) 1 part, leveling agent (acrylic acid-organic silicon copolymer) 0.4 part, thickener (cellulose thickening agent) 12 parts, anti-settling agent (polyamide wax ammonium salt) 1.5 parts, pH regulator 0.05 part and deionized water 40 parts, spare;

(2), mix and stir the dispersant, co-solvent, water-based aluminum silver paste and 5 parts of deionized water evenly, soak for 15-20 minutes, and obtain component A for later use;

(3) Mix the water-based acrylic emulsion, defoamer, leveling agent, thickener, anti-sedimentation agent and the remaining deionized water evenly, and obtain component B after stirring evenly, and set aside;

(4) Component B is stirred at a low speed (90/min), and component A is added while stirring, and stirred evenly to obtain component C, which is set aside;

(5) The pH value of component C is adjusted to 8 with a pH regulator to obtain a water-based automotive metal base paint.

Test Data

With reference to relevant national or industry standards, perform performance testing on the above specific embodiments:

Mix the aluminum powder paint of Example 1-3 with deionized water or drinking tap water at a ratio of 100:10, spray it on the tin plate, and place it in a constant temperature and humidity room (23±2°C, 50±5%) to dry And select the corresponding adjustment time according to the technical indicators. The measured technical indicators are shown in the table below:

Claims (10)

1. aqueous automobile metal bottom colored paint, is characterized in that: be made up of the raw material of following parts by weight: aqueous acrylic emulsion 30 ~ 40 parts, water aluminum-silver slurry 5-10 part, dispersion agent 0.3 ~ 1 part, solubility promoter 3-6 part, defoamer 0.3 ~ 1 part, flow agent 0.4 ~ 1 part, thickening material 7 ~ 12 parts, anti-settling agent 1.5 ~ 3.5 parts, pH adjusting agent 0.02 ~ 0.05 part and deionized water 35 ~ 45 parts.

2. aqueous automobile metal bottom colored paint as claimed in claim 1, is characterized in that: described aqueous acrylic emulsion is one in water-borne acrylic resin and Aqueous acrylic urethane's dispersion or arbitrarily than mixture.

3. aqueous automobile metal bottom colored paint as claimed in claim 1, it is characterized in that: described water aluminum-silver slurry is non-floating type aluminium-silver slurry, the aluminium silver powder particle diameter of aluminium-silver slurry is 5-80 micron, and the shape of aluminium-silver slurry is rice krispies flower pattern or silver dollar type.

4. aqueous automobile metal bottom colored paint as claimed in claim 1, is characterized in that: described dispersion agent is that one or more in modified polyacrylate superpolymer, modified polyacrylate and ethylenic copolymer, the alkanolamine salt of high molecular weight carboxylic, fatty acid modified polyester are arbitrarily than mixture.

5. aqueous automobile metal bottom colored paint as claimed in claim 1, is characterized in that: described defoamer is arbitrarily than mixture containing one or more in organic-silicon-modified water-based emulsion shape defoamer, organically-modified polydimethylsiloxane, ethylenic copolymer, vinyl polymer.

6. aqueous automobile metal bottom colored paint as claimed in claim 1, is characterized in that: described flow agent is that one or more in organic silicon modified by polyether polymkeric substance, organic silicon modified by polyether, modified polyorganosiloxane emulsion, the polyacrylic hydrosol of fluorine-carbon modified pre-neutralization, vinylformic acid-Organosiliconcopolymere are arbitrarily than mixture.

7. aqueous automobile metal bottom colored paint as claimed in claim 1, is characterized in that: described thickening material is association type polyurethane thickener, the swelling acroleic acid polyurethane of alkali or cellulose thickener.

8. aqueous automobile metal bottom colored paint as claimed in claim 1, is characterized in that: described anti-settling agent polyamide wax ammonium salt or organobentonite; PH adjusting agent is dimethylethanolamine, ammoniacal liquor or triethylamine.

9. the preparation method of aqueous automobile metal bottom colored paint as described in claim as arbitrary in claim 1-8, is characterized in that: comprise the following steps:

(1), aqueous ACRYLIC EMULSION 30 ~ 40 parts, water aluminum-silver slurry 5-10 part, dispersion agent 0.3 ~ 1 part, solubility promoter 3-6 part, defoamer 0.3 ~ 1 part, flow agent 0.4 ~ 1 part, thickening material 7 ~ 12 parts, anti-settling agent 1.5 ~ 3.5 parts, pH adjusting agent 0.02 ~ 0.05 part and deionized water 35 ~ 45 parts by weight, for subsequent use;

(2), by dispersion agent, solubility promoter, water aluminum-silver slurry and 5 parts of deionized water mixing and stirring, soak 15-20 minute, obtain component A for subsequent use;

(3), by aqueous acrylic emulsion, defoamer, flow agent, thickening material, anti-settling agent and residue deionized water mix, after stirring, obtain component B, for subsequent use;

(4), component B under stirring at low speed, stir while add component A, stir, obtain component C, for subsequent use;

(5), pH value is adjusted to 7.5-8.5 by component C pH adjusting agent, namely obtains aqueous automobile metal bottom colored paint.

10. the preparation method of aqueous automobile metal bottom colored paint as claimed in claim 9, is characterized in that: the stirring velocity of the stirring at low speed in described step (4) is no more than 100r/min.