CN103146278B - Preparation method of low-temperature curing water-based acrylic amino baking coating - Google Patents

Abstract

The invention discloses a preparation method of a low-temperature curing water-based acrylic amino baking coating, belonging to the field of a production technology of a water-based amino baking coating. The method comprises the following steps of: mixing water, a wetting dispersant, an antifoaming agent, an anti-settling agent, a color filler, anticorrosion filler and water-based epoxy modified acrylic resin, and dispersing uniformly to obtain slurry; in a stirring state, adding water-based amino resin, an anti-flash rust agent, a drier and a leveling agent into the ground slurry; and dispersing uniformly by a high-speed dispersing machine. The water-based acrylic amino baking coating provided by the invention is convenient to produce, the product has a single component, the diluent is water, the cost is low, and the product is environment-friendly; and after being diluted, the water-based acrylic amino baking coating is directly subjected to spray construction, the construction is convenient, the curing temperature is low, the drying speed is high, the construction efficiency of the water-based acrylic amino baking coating is improved, the resources are saved, and the cost is lowered. The dried film is flat, full and bright, and has good gloss retention and color retention and excellent mechanical performance, water resistance and corrosion resistance; and the film is resistant to grease and high temperature.

Description

A kind of preparation method of low-temperature curing waterborne acrylic acid amino baking coating

technical field

The invention belongs to the technical field of production of water-based amino baking paint.

Background technique

Aminoacrylic baking coatings have excellent gloss and color retention properties, and are especially suitable for high decorative and high weather resistance surface coatings and are favored by people. However, the water-based acrylic amino baking coatings currently on the market generally have a long baking time and a high baking temperature, resulting in high energy consumption and low practical application efficiency, which affects their popularization and application. For this reason, research on water-based low-temperature baking acrylic coatings has broad application prospects.

Contents of the invention

The purpose of the present invention is to propose a method for preparing a low-temperature curing water-based acrylic amino baking coating which is easy to use, low in curing temperature and short in drying time.

The present invention comprises the following steps:

1) Mix water, wetting and dispersing agent, defoamer, anti-settling agent, pigment and filler, anti-corrosion filler and water-based epoxy modified acrylic resin to form a slurry;

2) Grind the slurry with a sand mill to a fineness of ≤25 μm;

3) Add water-based amino resin, anti-flash rust agent, drier and leveling agent into the ground slurry under stirring, and then disperse evenly through a 1000r/min high-speed disperser. The water-based amino resin is water-dispersed and water-emulsified water-based acrylic resin.

The present invention is convenient to produce, and its superior effect is:

1. The invention is a single component, and the diluent is water, which is low in cost and environmentally friendly. It can be sprayed directly after dilution, and the construction is convenient.

2. The water-based acrylic amino baking paint prepared by the present invention has low curing temperature and fast drying speed, which improves the construction efficiency of the water-based amino baking paint, saves resources and reduces costs.

3. The dried coating film of the present invention is flat, plump and bright, has excellent gloss retention and color retention, excellent mechanical properties, water resistance and corrosion resistance, and the coating film is resistant to oil stains and high temperature, and can be used for the protection of locomotive engines coating.

4. The product prepared by the present invention has good storage stability and high cost performance, and can be widely used in industrial fields such as automobiles, home appliances, hardware, etc., and can also be commonly used as anti-corrosion and decoration on metal surfaces, and can be used as top coats and primers. When the bottom surface is painted in one, it also has excellent decorative and protective effects.

In addition, the water-dispersed water-based acrylic resin of the present invention can use water-based epoxy-modified acrylic resin 1628A; the water-emulsion water-based acrylic resin can use water-based epoxy-modified acrylic resin WR-553.

The water-based amino resin is low methyl etherified amino resin 717, low methyl etherified amino resin 072, low methyl etherified amino resin MA-80 or low methyl etherified amino resin 5717W.

The pigments and fillers include titanium dioxide, talcum powder and pigments, and the titanium dioxide is anatase titanium dioxide or rutile titanium dioxide.

The anti-corrosion filler is zinc phosphate, composite zinc phosphate or aluminum tripolyphosphate.

The wetting and dispersing agent is a modified dihydroxycarboxylate compound WD-1010; the anti-settling agent is a hydrophilic polyamide compound AS-280; the defoamer is a water-based paint defoamer AX- 250; the drier is a blocked phosphoramidosulfonate compound 2050W; the leveling agent is a modified dihydroxy polyether compound FL-330.

In order to ensure the quality of the produced products, when mixing, water, wetting and dispersing agent, defoaming agent, anti-settling agent, pigment filler, anti-corrosion filler, water-based epoxy modified acrylic resin, water-based amino resin, anti-flash rust agent, The mass ratio of drier and leveling agent is 14～18︰0.4～1.2︰0.1～0.4︰1～3︰14～28︰8～15︰25～40︰7～15︰0.1～0.4︰0.5～ 2︰0.2～0.6.

Detailed ways

1. Ingredients:

The formula of embodiment 1:

raw material Mass (unit: g) water 16.2 Water-based acrylic resin 1628A 35.7 Anatase Titanium Dioxide 8 Phthalo blue 0.1 Envelope medium yellow 2 Zinc phosphate 10 talcum powder 10 Modified dihydroxycarboxylate compound WD-1010 0.6 Hydrophilic polyamide compound AS-280 1.5 Defoamer AX-250 for water-based paint 0.3 Anti-flash rust agent 0.2 Low methyl etherified amino resin 717 or low methyl etherified amino resin 072 14.3 Blocked Phosphatamine Sulfonate 2050W 1.5 Modified dihydroxy polyether compound FL-330 0.3

The formula of embodiment 2:

raw material Mass (unit: g) water 16.2 Water-based acrylic resin WR-553 35.7 Rutile Titanium Dioxide 8 Phthalo blue 0.1 Envelope medium yellow 2 Composite zinc phosphate or aluminum tripolyphosphate 10 talcum powder 10 Modified dihydroxycarboxylate compound WD-1010 0.6 Hydrophilic polyamide compound AS-280 1.5 Defoamer AX-250 for water-based paint 0.3 Anti-flash rust agent 0.2 Low methyl etherified amino resin MA-80 or low methyl etherified amino resin 5717W 14.3 Blocked Phosphatamine Sulfonate 2050W 1.5 Modified dihydroxy polyether compound FL-330 0.3

2. Preparation process:

  Follow the steps below for the above two recipes:

(1) Mix water, wetting and dispersing agent WD-1010, defoamer AX-250, anti-sedimentation agent AS-280, pigments and fillers (anatase titanium dioxide, phthalocyanine blue, yellow in the coating and talcum powder), Anti-corrosion filler (zinc phosphate or composite zinc phosphate or aluminum tripolyphosphate) and water-based epoxy-modified acrylic resin (water-based epoxy-modified acrylic resin 1628A or water-based epoxy-modified acrylic resin WR-553) are put into the dispersion tank, and A 1200r/min high-speed disperser disperses for 15-20 minutes to form a slurry.

(2) Add the slurry to a sand mill and grind to a fineness of ≤25 μm.

(3) Water-based amino resin (imported low methyl etherified amino resin 717, imported low methyl etherified amino resin 072, domestic low methyl etherified amino resin MA-80 or domestic low methyl etherified amino resin 5717W) under stirring. ), anti-flash rust agent, drier (blocked sulfonate phosphoamido compound 2050W) and leveling agent (modified dihydroxy polyether compound FL-330) were added to the ground slurry, and 1000r/min high-speed The disperser disperses evenly.

(4) Packaging.

Three, the coating of above-mentioned embodiment 1 and 2 is detected respectively, and coating main performance index is:

1, the coating index of embodiment 1:

Indicator name Technical Specifications Requirements Measured indicators paint state Uniform without lumps qualified Storage stability/d(60℃) 7d no change qualified Solid content, % —— ≧65 Coating Appearance —— smooth Drying time/min(110℃) —— 20min Adhesion (cross-cut method)/level —— 1 Impact resistance, Kg cm 35 50 Hardness (pencil method)/grade 2H ≧2H Flexibility, mm 2 1 Gloss (60°C) 90 ≧90 Water resistance/h(25℃) 168 480 Salt water resistance/h (3% NaCl, 25°C) 168 500 Acid resistance/h (5% H ₂ SO ₄ , 40°C) 4 ≧4 Alkali resistance/h (5% NaOH, 40°C) 4 ≧4 Gasoline resistance/h (soaked in national standard 1922-80 solvent oil) 48 No blistering, no wrinkling, no shedding Neutral salt spray test 600 h streaked unidirectional rust <2 mm qualified artificial weathering, h 500 color change level 4 qualified

2, the coating index of embodiment 2:

Indicator name Technical Specifications Requirements Measured indicators paint state Uniform without lumps qualified Storage stability/d(60℃) 7d no change qualified Solid content, % —— ≧55 Coating Appearance —— smooth Drying time/min(100℃) —— 20min Adhesion (cross-cut method)/level —— 1 Impact resistance, Kg cm 35 50 Hardness (pencil method)/grade 2H ≧2H Flexibility, mm 2 1 Gloss (60°C) 90 ≧90 Water resistance/h(25℃) 168 400 Salt water resistance/h (3% NaCl, 25°C) 168 500 Acid resistance/h (5% H ₂ SO ₄ , 40°C) 4 ≧4 Alkali resistance/h (5% NaOH, 40°C) 4 ≧4 Gasoline resistance/h (soaked in national standard 1922-80 solvent oil) 48 No blistering, no wrinkling, no shedding Neutral salt spray test 600 h streaked unidirectional rust <2mm qualified artificial weathering, h 500 color change level 4 qualified

It can be seen from the above two tables that both water-dispersed and water-emulsion water-based acrylic resins can be successfully prepared into low-temperature curing water-based acrylic amino baking coatings with excellent performance.

Claims (6)

1. A preparation method for low-temperature curing water-based acrylic amino baking paint, firstly mixing water, wetting and dispersing agent, defoamer, anti-settling agent, pigment filler, anti-corrosion filler and water-based epoxy modified acrylic resin and then dispersing evenly , to form a slurry; then grind the slurry with a sand mill to a fineness ≤ 25 μm; it is characterized in that: in the state of stirring, water-based amino resin, anti-flash rust agent, drier and leveling agent are added to the grinding well In the slurry, disperse evenly through 1000r/min high-speed disperser; The water-based amino resin is water dispersion type and water emulsion type water-based acrylic resin; when mixing, the water, wetting and dispersing agent, defoamer, anti The mass ratio of sinking agent, pigment and filler, anti-corrosion filler, water-based epoxy modified acrylic resin, water-based amino resin, anti-flash rust agent, drier and leveling agent is 14～18︰0.4～1.2︰0.1～0.4︰ 1~3: 14~28: 8~15: 25~40: 7~15: 0.1~0.4: 0.5~2: 0.2~0.6. 2. The preparation method according to claim 1, wherein the water-based acrylic resin is water-based epoxy-modified acrylic resin 1628A or water-based epoxy-modified acrylic resin WR-553. 3. The preparation method according to claim 1, characterized in that: the water-based amino resin is low methyl etherified amino resin 717, low methyl etherified amino resin 072, low methyl etherified amino resin MA-80 or low methyl ether Amino resin 5717W. 4. The preparation method according to claim 1, characterized in that: the pigments and fillers include titanium dioxide, talcum powder and pigments, and the titanium dioxide is anatase titanium dioxide or rutile titanium dioxide. 5. The preparation method according to claim 1, characterized in that: the anti-corrosion filler is zinc phosphate, composite zinc phosphate or aluminum tripolyphosphate. 6. The preparation method according to claim 1, characterized in that: the wetting and dispersing agent is a modified dihydroxycarboxylate compound WD-1010; the anti-sedimentation agent is a hydrophilic polyamide compound AS-280 ; The defoamer is the defoamer AX-250 for water-based paint; the drier is the blocked phosphoammonium sulfonate compound 2050W; the leveling agent is the modified dihydroxy polyether compound FL-330.