CN110240857A - A kind of aqueous double-component polyurethane coating and preparation method thereof - Google Patents
A kind of aqueous double-component polyurethane coating and preparation method thereof Download PDFInfo
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- CN110240857A CN110240857A CN201910467390.6A CN201910467390A CN110240857A CN 110240857 A CN110240857 A CN 110240857A CN 201910467390 A CN201910467390 A CN 201910467390A CN 110240857 A CN110240857 A CN 110240857A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
- C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
- C08G18/6225—Polymers of esters of acrylic or methacrylic acid
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
- C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K3/00—Use of inorganic substances as compounding ingredients
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Abstract
The invention discloses a kind of aqueous double-component polyurethane coating in sealing wax field, including host agent and curing agent, the host agent to be made of the following component for accounting for parts by weight: 7.0~10.0 parts of deionized water；0.5~0.8 part of dispersing agent；0.1~0.3 part of bentonite；15.0~21.0 parts of titanium dioxide；2.5~5.5 parts of blanc fixe；50.0~60.0 parts of hydroxyl acrylic aqueous dispersion；10.0~25.0 parts of acrylic emulsion；3.5~7.5 parts of cosolvent；0.1~0.3 part of pH adjusting agent；0.1~0.3 part of substrate wetting agents；0.1~0.3 part of defoaming agent；0.1~0.2 part of levelling agent；0.3~0.8 part of curing agent of thickener is made of the following component for accounting for parts by weight: 70.0~80.0 parts of water-based isocyanate；20.0~30.0 parts of propylene glycol methyl ether acetate, the present invention can save 10%~20% cost under the premise of not reducing comprehensive performance substantially, and can also help, which reduces film, the probability of disadvantage occurs, improve the application property of coating.
Description
Technical field
The present invention relates to a kind of water paint, in particular to a kind of water paint preparation method.
Background technique
Polyurethane coating is a kind of coating more typical at present, can be divided into bicomponent polyurethane coating and the poly- ammonia of one pack system
Ester paint.Double-component polyurethane coating is usually (to be also low molecule carbamic acid by hydroxy-containing resin and isocyanate prepolymer
Ester polymer) two parts composition, commonly referred to as host agent component and curing agent component.The various types of this kind of coating, using model
It encloses also very wide, it is poly- that acroleic acid polyurethane, alcohol acid and polyurethane, polyester-polyurethane, polyethers can be divided into according to the difference of hydroxyl component
The kinds such as urethane, epoxy polyurethane.Generally all there is good mechanical performance, higher solid content, the performance of various aspects is all
It is relatively good, it is a kind of coating kind rising at present.Main application direction has woodwork coating, car repair to apply
Material, anticorrosive paint, floor paint, electronic paint, sapecial coating, water-repellent paint etc..The disadvantage is that working procedure is complicated, to construction environment
It is required that very high, paint film is easy to produce disadvantage.Monocomponent polyurethane paint mainly has urethane oil paint, moisture solidification polyurethane to apply
The kinds such as material, blocked polyurethane paint.Application surface is wide not as good as dual-component coating, is mainly used for floor paint, anticorrosive paint, pre-
Coil coating etc., overall performance are comprehensive not as good as dual-component coating.
Double-component polyurethane coating have film-forming temperature is low, adhesive force is strong, wearability is good, hardness is big and chemicals-resistant,
The superior functions such as good weatherability are widely used as industrial protection, wood furniture and car paint.Need when use by host agent component and
Curing agent component proportionally requires to be uniformly mixed, and water is added to adjust to suitable spray viscosity.Aqueous double-component polyurethane coating
The low VOC content of the high-performance of two-component solvent borne polyurethane coating and water paint is combined, grinding for coatings industry is become
Study carefully hot spot.Aqueous polyurethane has many advantages, such as that non-ignitable, free from environmental pollution, energy saving, operation is easy to process using water as medium, has simultaneously
Have polyurethane resin the excellent properties such as intrinsic high-intensitive, wear-resistant, high durable, therefore have been widely used.It is aqueous
Double-component polyurethane coating is made of the aqueous polyalcohol of the base Han-OH and the polyisocyanate curing agent of the base containing-NCO,
Film performance is mainly determined by the Nomenclature Composition and Structure of Complexes of hydroxy resin.
Aqueous double-component polyurethane coating property is excellent, but due to the water-based isocyanate price in curing agent component compared with
Height, results in that aqueous double-component polyurethane overall price is also higher, and price is obtained at aqueous double-component polyurethane coating into one
Walk widely applied maximum obstruction.
Summary of the invention
The object of the present invention is to provide a kind of aqueous double-component polyurethane coating and preparation method thereof, simple processes, section
About energy consumption, and 10%~20% cost can also can be saved under the premise of not reducing comprehensive performance substantially, it can also help
It reduces film and the probability of disadvantage occurs, improve the application property of coating.
The object of the present invention is achieved like this: a kind of aqueous double-component polyurethane coating and preparation method thereof, the painting
Material includes host agent and curing agent, and the host agent is made of the following component for accounting for parts by weight:
7.0~10.0 parts of deionized water；
0.5~0.8 part of dispersing agent；
0.1~0.3 part of bentonite；
15.0~21.0 parts of titanium dioxide；
2.5~5.5 parts of blanc fixe；
50.0~60.0 parts of hydroxyl acrylic aqueous dispersion；
10.0~25.0 parts of acrylic emulsion；
3.5~7.5 parts of cosolvent；
0.1~0.3 part of pH adjusting agent；
0.1~0.3 part of substrate wetting agents；
0.1~0.3 part of defoaming agent；
0.1~0.2 part of levelling agent
0.3~0.8 part of thickener
The curing agent is made of the following component for accounting for parts by weight:
70.0~80.0 parts of water-based isocyanate；
20.0~30.0 parts of propylene glycol methyl ether acetate；
The preparation method comprises the following steps:
The preparation method comprises the following steps for host agent:
1) master grind
A. match according to aforementioned proportion and get raw material ready；
B. the deionized water of formula ratio 80% is added in dispersion cylinder, is slowly added into dispersing agent, the bentonite of formula ratio under stiring,
It is dispersed with stirring to uniform state；
C. under stiring, it is slowly added to titanium dioxide, the blanc fixe of formula ratio, is uniformly dispersed, is then ground with sand mill
Mill, until fineness≤20 μm；
D. after fineness reaches requirement, mill base is filtered out, with 3 flushing of deionization moisture sand milling cylinder of formula surplus, and by the part
Flushing water is for subsequent in paint；
2) mix stages
A. hydroxyl acrylic aqueous dispersion, the acrylic emulsion of formula ratio are added in paint mixing cylinder；Under stiring, it is slowly added to grind
Grind the flushing water in mill base stage；
B. under stiring, it is slowly added to the mill base that (1) step makes；
C. under stiring, it is slowly added to the cosolvent and pH adjusting agent of formula ratio, adjusts pH to 7~8；
D. under stiring, it is slowly added to the defoaming agent, levelling agent, substrate wetting agents of formula ratio；
E. under stiring, the thickener of formula ratio is added, 700-900 revs/min is stirred 15 minutes, adjusting viscosity to 60~
65Ku filters the host agent component to get aqueous double-component acroleic acid polyurethane coating with 200 mesh filter screens.
The preparation method comprises the following steps for curing agent component:
A. dispersion cylinder, dispersion impeller are cleaned out, any moisture cannot be contained；The propylene glycol of formula ratio is poured into dispersion cylinder
Methyl ether acetate；
B. under 300 revs/min of mixing speed, the water-based isocyanate curing agent of formula ratio, stirring are added into dispersion cylinder
To uniform, the curing agent component to get aqueous double-component acroleic acid polyurethane coating is filtered with 200 mesh filter screens.
It is further limited as of the invention, including host agent and curing agent, the host agent is by accounting for the following component of parts by weight
Composition:
8.5 parts of deionized water；
0.6 part of dispersing agent；
0.2 part of bentonite；
18.0 parts of titanium dioxide；
2.5 parts of blanc fixe；
55.0 parts of hydroxyl acrylic aqueous dispersion；
15.0 parts of acrylic emulsion；
4.0 parts of cosolvent；
0.15 part of pH adjusting agent；
0.3 part of substrate wetting agents；
0.15 part of defoaming agent；
0.2 part of levelling agent；
0.3 part of thickener；
The curing agent component is made of the following component for accounting for parts by weight:
70.0 parts of water-based isocyanate；
30.0 parts of propylene glycol methyl ether acetate.
It is further limited as of the invention, it is 3.3% two fractions that the hydroxyl acrylic aqueous dispersion, which selects hydroxy radical content,
Granular media；The glass transition temperature (Tg) of the acrylic emulsion is 55 DEG C.
It is further limited as of the invention, the cosolvent selects dipropylene DPnB；The pH adjusting agent
Select dimethylethanolamine DMEA, content >=99.5%.
It being further limited as of the invention, the water-based isocyanate selects the dispersible HDI type isocyanates of water,
Solid content is 99.5~100%, and-nco value is 21~22%；Purity >=99.5% of propylene glycol methyl ether acetate PMA, and it is aqueous
Amount≤0.05%.
The effect of each component in formula:
Water-based hydroxyl acrylic emulsion, acrylic emulsion: the main film forming matter in coating system, the performance of paint film is mainly by forming a film
The property of object itself determines；
Dispersing agent: its effect is to reduce time and energy required for completing dispersion process, stablizes dispersed pigments and fillers point
Granular media, modified pigments and fillers particle surface properties, adjusts the motility of pigments and fillers particle.Appropriate dispersing agent is added, can be shortened dispersion
Time improves gloss, improves tinting strength, tinting power and covering power, improves the color developing and toning property of pigment, prevents floating, prevent from wadding a quilt with cotton
It is solidifying, it prevents from settling；
Bentonite: bentonite has good suspension and dispersibility in an aqueous medium, forms jelly in water, has certain
Thickening power, so that coating is not easy to precipitate, is not easy to be layered, improve the storage stability of coating.Bentonite can also improve coating
Thixotropy improve the construction stability of coating so that coating is not easy sagging when being sprayed onto substrate surface；
Titanium dioxide: titanium dioxide is a kind of inorganic pigment being widely used, without any toxicity, and have it is good dispersibility and
Covering power；
Blanc fixe: blanc fixe is a kind of common constitution filler, and filling effect is played in paint film, improves the screening of paint film
The hardness of lid rate and paint film；
Cosolvent: the addition of cosolvent can reduce the viscosity of system, can enhance lotion to the wetability of pigments and fillers, so as to improve
Dispersion effect；Cosolvent is also the coalescing agent of acrylic emulsion, can reduce the minimum film formation temperature of lotion, can also be improved
The evaporation rate of coating keeps the film forming of coating more preferable, and levelability is also more preferably；
Dimethylethanolamine DMEA:DMEA is used as pH adjusting agent in coating；By the pH stable of coating system 8 or so,
The post storage stability of coating, not easily settled, layering can be improved；
Substrate wetting agents: the effect of substrate wetting agents mainly reduces the surface tension of water paint, reduces coating to substrate dirt
Contaminate object susceptibility so that coating can be more preferable on substrate sprawl, reduce paint film there is the probability of the disadvantages such as shrinkage cavity, pinprick,
Guarantee that paint film is complete；
Defoaming agent: the effect of defoaming agent mainly prevents the bubble due to caused by high-speed stirred in dispersion process, and inhibits
The bubble generated in packaging process, in painting process guarantees that paint film is complete；
Levelling agent: the surface tension of coating can be effectively reduced in levelling agent, improve the levelability and uniformity of coating, coating is promoted to exist
A smooth, smooth, uniform film is formed during drying and forming-film；
Thickener: thickener is a kind of auxiliary rheological agents, under appropriate shearing force, coating can be made to thicken, prevented in construction
There is sagging phenomenon, and the excellent mechanical performance of coating and storage stability can be assigned；Thickener water lower for viscosity
For property coating, it is very important auxiliary agent.
Compared with prior art, the beneficial effects of the present invention are the present invention has selected high Tg acrylic emulsion to go to replace
A part of hydroxyl acrylic aqueous dispersion, the properties such as high glaze, high rigidity, high durable after high Tg acrylic emulsion is formed a film, with
The properties perfection contracts such as high glaze, high rigidity, high durable after hydroxyl acrylic aqueous dispersion and isocyanate curing agent crosslinking curing
It closes, maintains the original performance level of double-component acrylic acid polyurethane；In addition, since acrylic emulsion has replaced part of hydroxyl
Acrylic acid dispersion, it is possible to the dosage of isocyanate curing agent is reduced, to significantly reduce formulation cost；Furthermore third
Olefin(e) acid lotion physical film deposition speed is relatively fast, can promote the initial stage water resistance of film.
Specific embodiment
The present invention will be further described combined with specific embodiments below.
Water-based hydroxyl acrylic acid dispersion in following embodiment selects secondary breakup body, and acrylic emulsion selects vitrifying
The lotion that temperature (Tg) is 55 DEG C, pH adjusting agent select Yangtze petrochemical industry-BASF AG's production DMEA, and dispersing agent selects moral
State Digao Tego-760W, substrate wetting agents select Germany BYK-349, and defoaming agent selects Germany BYK-024, and levelling agent selects moral
State BYK-381, thickener select Dow RM-8W.
Embodiment 1
A kind of aqueous double-component polyurethane coating, including host agent and curing agent, the host agent is by accounting for the following component groups of parts by weight
At:
7.0 parts of deionized water；
0.5 part of dispersing agent；
0.1 part of bentonite；
15.0 parts of titanium dioxide；
3 parts of blanc fixe；
50.0 parts of hydroxyl acrylic aqueous dispersion；
10.0 parts of acrylic emulsion；
3.5 parts of cosolvent；
0.1 part of pH adjusting agent；
0.1 part of substrate wetting agents；
0.1 part of defoaming agent；
0.1 part of levelling agent；
0.5 part of thickener；
The curing agent component is made of the following component for accounting for parts by weight:
75.0 parts of water-based isocyanate；
20.0 parts of propylene glycol methyl ether acetate；
The quality proportioning of host agent component and curing agent group is 5:1.
Embodiment 2
A kind of aqueous double-component polyurethane coating, including host agent and curing agent, the host agent is by accounting for the following component groups of parts by weight
At:
8.5 parts of deionized water；
0.6 part of dispersing agent；
0.2 part of bentonite；
18.0 parts of titanium dioxide；
2.5 parts of blanc fixe；
55.0 parts of hydroxyl acrylic aqueous dispersion；
15.0 parts of acrylic emulsion；
4.0 parts of cosolvent；
0.15 part of pH adjusting agent；
0.3 part of substrate wetting agents；
0.15 part of defoaming agent；
0.2 part of levelling agent；
0.3 part of thickener；
The curing agent component is made of the following component for accounting for parts by weight:
70.0 parts of water-based isocyanate；
30.0 parts of propylene glycol methyl ether acetate；
The quality proportioning of host agent component and curing agent group is 4.5:1.
Embodiment 3
A kind of aqueous double-component polyurethane coating, including host agent and curing agent, the host agent is by accounting for the following component groups of parts by weight
At:
10.0 parts of deionized water；
0.8 part of dispersing agent；
0.3 part of bentonite；
21.0 parts of titanium dioxide；
5.5 parts of blanc fixe；
60.0 parts of hydroxyl acrylic aqueous dispersion；
25.0 parts of acrylic emulsion；
7.5 parts of cosolvent；
0.3 part of pH adjusting agent；
0.3 part of substrate wetting agents；
0.3 part of defoaming agent；
0.2 part of levelling agent；
0.8 part of thickener；
The curing agent component is made of the following component for accounting for parts by weight:
80.0 parts of water-based isocyanate；
25.0 parts of propylene glycol methyl ether acetate；
The quality proportioning of host agent component and curing agent group is 4:1.
The aqueous double-component acroleic acid polyurethane coating of above-mentioned 3 embodiments is made by following preparation method.
A kind of aqueous double-component acroleic acid polyurethane coating preparation method, comprising the following steps:
1) master grind
A. match according to aforementioned proportion and get raw material ready；
B. the deionized water of formula ratio 80% is added in dispersion cylinder, is slowly added into dispersing agent, the bentonite of formula ratio under stiring,
It is dispersed with stirring to uniform state；
C. under stiring, it is slowly added to titanium dioxide, the blanc fixe of formula ratio, is uniformly dispersed, is then ground with sand mill
Mill, until fineness≤20 μm；
D. after fineness reaches requirement, mill base is filtered out, with 3 flushing of deionization moisture sand milling cylinder of formula surplus, and by the part
Flushing water is for subsequent in paint；
2) mix stages
A. hydroxyl acrylic aqueous dispersion, the acrylic emulsion of formula ratio are added in paint mixing cylinder.Under stiring, it is slowly added to grind
Grind the flushing water in mill base stage；
B. under stiring, it is slowly added to the mill base that (1) step makes；
C. under stiring, it is slowly added to the pH adjusting agent of formula ratio, adjusts pH to 7~8；
D. under stiring, it is slowly added to the defoaming agent, levelling agent, substrate wetting agents of formula ratio；
E. under stiring, the thickener of formula ratio is added, 700-900 revs/min is stirred 15 minutes, adjusting viscosity to 60~
65Ku filters the host agent component to get aqueous double-component acroleic acid polyurethane coating with 200 mesh filter screens.
Curing agent component preparation method the following steps are included:
A. dispersion cylinder, dispersion impeller are cleaned out, cannot especially contains any water；The third of formula ratio is poured into dispersion cylinder
Glycol methyl ether acetate；
B. under 300 revs/min of mixing speed, the aqueous of formula ratio is added into dispersion cylinder
Isocyanate curing agent is stirred until homogeneous, and is filtered with 200 mesh filter screens to get aqueous double-component acroleic acid polyurethane coating
Curing agent component.
The dual-component coating and unadjusted aqueous double-component acrylic polyurethane coating that above three embodiments are obtained, with
And Qi Jinhang performance compares, it is as a result as follows:
。
Have upper table as it can be seen that replacing part of hydroxyl acrylic acid dispersion using the acrylic emulsion of high Tg, preparation it is aqueous double
Component polyurethane coating, the advantages that maintaining the original high glaze of double-component polyurethane coating, high rigidity substantially, do speed, water-fast
Property and salt fog resistance also promoted so that coating performance itself obtains comprehensive raising；It is whole due to reducing curing agent usage amount
Body cost decline, so that coating itself has higher cost performance.Moreover, the aqueous double-component with Hebei morning yang edema paint company is poly-
Urethane finishing coat is compared, and is had a clear superiority in terms of rate of drying and patience.
The present invention is not limited to the above embodiments, on the basis of technical solution disclosed by the invention, the skill of this field
For art personnel according to disclosed technology contents, one can be made to some of which technical characteristic by not needing creative labor
A little replacements and deformation, these replacements and deformation are within the scope of the invention.
Claims (6)
1. a kind of aqueous double-component polyurethane coating, which is characterized in that including host agent and curing agent, the host agent is by accounting for parts by weight
Following component composition:
7.0~10.0 parts of deionized water；
0.5~0.8 part of dispersing agent；
0.1~0.3 part of bentonite；
15.0~21.0 parts of titanium dioxide；
2.5~5.5 parts of blanc fixe；
50.0~60.0 parts of hydroxyl acrylic aqueous dispersion；
10.0~25.0 parts of acrylic emulsion；
3.5~7.5 parts of cosolvent；
0.1~0.3 part of pH adjusting agent；
0.1~0.3 part of substrate wetting agents；
0.1~0.3 part of defoaming agent；
0.1~0.2 part of levelling agent
0.3~0.8 part of thickener
The curing agent is made of the following component for accounting for parts by weight:
70.0~80.0 parts of water-based isocyanate；
20.0~30.0 parts of propylene glycol methyl ether acetate.
2. a kind of aqueous double-component polyurethane coating according to claim 1, which is characterized in that including host agent and solidification
Agent, the host agent are made of the following component for accounting for parts by weight:
8.5 parts of deionized water；
0.6 part of dispersing agent；
0.2 part of bentonite；
18.0 parts of titanium dioxide；
2.5 parts of blanc fixe；
55.0 parts of hydroxyl acrylic aqueous dispersion；
15.0 parts of acrylic emulsion；
4.0 parts of cosolvent；
0.15 part of pH adjusting agent；
0.3 part of substrate wetting agents；
0.15 part of defoaming agent；
0.2 part of levelling agent；
0.3 part of thickener；
The curing agent component is made of the following component for accounting for parts by weight:
70.0 parts of water-based isocyanate；
30.0 parts of propylene glycol methyl ether acetate.
3. according to claim 1 or a kind of 2 aqueous double-component polyurethane coating, which is characterized in that the hydroxy acrylic acid dispersion
It is 3.3% secondary breakup body that body, which selects hydroxy radical content,；The glass transition temperature (Tg) of the acrylic emulsion is 55 DEG C.
4. according to claim 1 or a kind of 2 aqueous double-component polyurethane coating, which is characterized in that the cosolvent selects dipropyl
Glycol butyl ether DPnB；The pH adjusting agent selects dimethylethanolamine DMEA, content >=99.5%.
5. according to claim 1 or a kind of 2 aqueous double-component polyurethane coating, which is characterized in that the water-based isocyanate choosing
With the dispersible HDI type isocyanates of water, solid content is 99.5~100%, and-nco value is 21~22%；Propylene glycol monomethyl ether
Purity >=99.5% of acetate PMA, and water content≤0.05%.
6. a kind of aqueous double-component polyurethane preparation method for coating, which comprises the following steps:
The preparation method comprises the following steps for host agent:
1) master grind
A. match according to aforementioned proportion and get raw material ready；
B. the deionized water of formula ratio 80% is added in dispersion cylinder, is slowly added into dispersing agent, the bentonite of formula ratio under stiring,
It is dispersed with stirring to uniform state；
C. under stiring, it is slowly added to titanium dioxide, the blanc fixe of formula ratio, is uniformly dispersed, is then ground with sand mill
Mill, until fineness≤20 μm；
D. after fineness reaches requirement, mill base is filtered out, with 3 flushing of deionization moisture sand milling cylinder of formula surplus, and by the part
Flushing water is for subsequent in paint；
2) mix stages
A. hydroxyl acrylic aqueous dispersion, the acrylic emulsion of formula ratio are added in paint mixing cylinder；Under stiring, it is slowly added to grind
Grind the flushing water in mill base stage；
B. under stiring, it is slowly added to the mill base that (1) step makes；
C. under stiring, it is slowly added to the cosolvent and pH adjusting agent of formula ratio, adjusts pH to 7~8；
D. under stiring, it is slowly added to the defoaming agent, levelling agent, substrate wetting agents of formula ratio；
E. under stiring, the thickener of formula ratio is added, 700-900 revs/min is stirred 15 minutes, adjusting viscosity to 60~
65Ku filters the host agent component to get aqueous double-component acroleic acid polyurethane coating with 200 mesh filter screens；
The preparation method comprises the following steps for curing agent component:
A. dispersion cylinder, dispersion impeller are cleaned out, any moisture cannot be contained；The propylene glycol of formula ratio is poured into dispersion cylinder
Methyl ether acetate；
B. under 300 revs/min of mixing speed, the water-based isocyanate curing agent of formula ratio, stirring are added into dispersion cylinder
To uniform, the curing agent component to get aqueous double-component acroleic acid polyurethane coating is filtered with 200 mesh filter screens.
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| CN110527426A (en) * | 2019-09-04 | 2019-12-03 | 浙江大风范家具股份有限公司 | A kind of solid wood furniture filling conduit coating at cement underseal bottom and preparation method thereof |
| CN110698963A (en) * | 2019-10-23 | 2020-01-17 | 郑州一安水性高分子材料有限公司 | High-wear-resistance water-based acrylic acid-polyurethane two-component finish paint |
| CN110746870A (en) * | 2019-10-23 | 2020-02-04 | 郑州一安水性高分子材料有限公司 | High-performance water-based acrylic polyurethane two-component coating |
| CN111303747A (en) * | 2020-03-31 | 2020-06-19 | 广东华润涂料有限公司 | Two-component coating composition and articles made therefrom |
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Application publication date: 20190917 |