CN111057455A - Water-based modified double-component PU (polyurethane) finish paint and preparation method thereof - Google Patents
Water-based modified double-component PU (polyurethane) finish paint and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a water-based modified double-component PU (polyurethane) finish paint and a preparation method thereof, and relates to the technical field of water-based coatings, wherein the water-based modified double-component PU finish paint comprises a component A and a component B which are separately stored and mixed according to the weight part ratio of (5-7) to 1 when in use, and the component A comprises the following raw materials in parts by weight: 45-48 parts of water-based acrylic resin; 0.15-0.25 part of defoaming agent; 0.5-0.7 part of water-based dispersant; 0.5-0.7 part of fumed silica; 4-6 parts of water-based zinc phosphate; 6-8 parts of talcum powder; 0.3-0.5 part of thickening agent; 3-4 parts of dipropylene glycol butyl ether; 7-8 parts of water-based carbon black color paste; 0.2-0.3 part of water-based wetting agent; 0.1-0.2 part of water-based wax slurry; 28-32 parts of deionized water; the component B comprises the following raw materials: 35-45 parts of a waterborne polyurethane curing agent; 35-40 parts of a water-based isocyanate curing agent; 20-25 parts of propylene glycol methyl ether acetate. When the waterborne modified double-component PU finishing paint is sprayed on zinc-plating materials such as cold galvanizing materials and hot galvanizing materials, the waterborne modified double-component PU finishing paint has excellent adhesive force and good integral application effect.
Description
Technical Field
The invention relates to the technical field of water-based coatings, in particular to a water-based modified double-component PU (polyurethane) finish paint and a preparation method thereof.
Background
The water-based paint takes various high polymer resins as a base material and water as a dispersion medium, has the characteristic of low Volatile Organic Compound (VOC) emission compared with the traditional solvent-based paint, and is green, safe and environment-friendly.
The invention discloses a water-based two-component polyurethane finish paint and a preparation method thereof in Chinese invention patent application with the publication number of CN106800874A, wherein the water-based two-component polyurethane finish paint consists of a component A and a component B, and the component A consists of the following components in percentage by weight: 10-15% of deionized water, 0.5-1.2% of wetting dispersant, 0.1-0.5% of defoaming agent, 12-25% of pigment, 58-70% of water-based hydroxyl acrylic acid dispersoid, 0.5-1% of flatting agent, 0.1-0.5% of substrate wetting agent and 0.1-0.5% of rheological additive; the component B is an isocyanate curing agent.
In the above application documents, hydrophilic polyisocyanate and hydrophobic low-viscosity asymmetric isocyanate trimer are mixed according to a certain proportion, the formed curing agent has low viscosity, no additional cosolvent is added, and the curing agent reacts with the aqueous hydroxyl acrylic acid dispersion, so that the generated VOC content is low, the crosslinking density of a paint film is high, and the chemical resistance is good, but with the social development, some steel products need to be galvanized to increase the corrosion and rust prevention effect, and the applications of cold-galvanized, hot-galvanized and electrogalvanized plates are more and more, and the above waterborne polyurethane finish paint has the defects of poor adhesion and multiple spraying on the galvanized plate, so that a new scheme needs to be provided to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the water-based modified double-component PU finish paint, which solves the technical problems, has excellent adhesive force and good integral application effect when being sprayed on zinc-plating materials such as cold galvanizing, hot galvanizing and the like.
In order to achieve the first purpose, the invention provides the following technical scheme:
a water-based modified double-component PU finishing paint comprises a component A and a component B which are independently stored and mixed according to the weight part ratio of (5-7) to 1 when in use, wherein the component A comprises the following raw materials in parts by weight:
45-48 parts of water-based acrylic resin;
0.15-0.25 part of defoaming agent;
0.5-0.7 part of water-based dispersant;
0.5-0.7 part of fumed silica;
4-6 parts of water-based zinc phosphate;
6-8 parts of talcum powder;
0.3-0.5 part of thickening agent;
3-4 parts of dipropylene glycol butyl ether;
7-8 parts of water-based carbon black color paste;
0.2-0.3 part of water-based wetting agent;
0.1-0.2 part of water-based wax slurry;
28-32 parts of deionized water;
the component B comprises the following raw materials:
35-45 parts of a waterborne polyurethane curing agent;
35-40 parts of a water-based isocyanate curing agent;
20-25 parts of propylene glycol methyl ether acetate.
By adopting the technical scheme, the water-based acrylic resin comprises acrylic resin emulsion, acrylic resin aqueous dispersion (also called water-dilutable acrylic acid) and acrylic resin aqueous solution, the water-based acrylic resin is prepared from copolymer resin with active cross-linkable functional groups, and cross-linking resin is additionally or not added during paint preparation, so that the active functional groups are cross-linked during film forming to form a paint film with a three-dimensional structure. The fumed silica provides thixotropy and reinforcement, and simultaneously can improve the adhesive force due to the extensibility, so that the structural strength and the adhesiveness of the whole paint film can be improved. The water-based zinc phosphate can play a role in flame retardance and rust prevention, so that the service life of a paint film is prolonged. The talcum powder has excellent physical and chemical properties such as lubricity, fire resistance, acid resistance, insulativity, high melting point, chemical inactiveness, good covering power, softness, good luster, strong adsorption power and the like, so that the water-based modified two-component PU finishing paint has excellent quality. Meanwhile, the talcum powder, the fumed silica and the water-based zinc phosphate can play a good role in compounding and synergism, so that the water-based modified double-component PU finishing coat has excellent adhesive force when being sprayed on zinc-plating materials such as cold galvanizing materials and hot galvanizing materials.
Dipropylene glycol butyl ether is a good film-forming aid and can impart excellent properties to the paint film. The water-based wax slurry has good heat resistance and time stability, can exert excellent anti-settling and anti-sagging functions, and greatly improves the overall quality of a paint film. Propylene glycol methyl ether acetate is a good solvent, has strong dissolving capacity on polar and non-polar substances, can fully combine a waterborne polyurethane curing agent and a waterborne isocyanate curing agent, and can form a paint film with good adhesive force when the obtained component B and the component A are sprayed on zinc-plated materials such as cold zinc plating, hot zinc plating and the like, so that the whole application effect is good.
Further preferably, 3-5 parts by weight of linoleic acid is also added into the component A of the aqueous modified two-component PU finishing paint.
By adopting the technical scheme, linoleic acid is octadecanoic conjugated dienoic acid, the long-chain structure can improve the flexibility and impact resistance of VDE, the special conjugated structure can improve the surface dryness of the waterborne modified two-component PU finishing paint, meanwhile, when the component B and the component A are mixed and react, the component B and the component A can enable micro-phase separation after macromolecule curing to form a tough and rigid interphase segment, and the waterborne modified two-component PU finishing paint has excellent adhesive force when being sprayed and used on a galvanized material.
Further preferably, 2-6 parts by weight of functional additives are added into the component A of the waterborne modified two-component PU finishing paint, and the functional additives are obtained by mixing phosphoric acid acrylate and chlorinated polyolefin.
By adopting the technical scheme, the phosphoric acid acrylate can react with the metal surface to generate a metal phosphate which plays a good role of a bridge between a polymer coating and a metal base material, so that the adhesive force of the water-based modified double-component PU finishing coat coating is greatly improved; the chlorinated polyolefin can form good wetting on a substrate, and the waterborne modified double-component PU finish paint has good adhesive force by bonding with a galvanized material; meanwhile, the phosphate acrylate and the chlorinated polyolefin can play a good role in compounding and synergism, and when the phosphate acrylate and the chlorinated polyolefin jointly form a functional assistant, the adhesive force of the waterborne modified two-component PU finishing paint on a galvanized material can be greatly improved.
More preferably, the weight part ratio of the phosphate acrylate to the chlorinated polyolefin in the functional auxiliary agent is (3-5): 1.
By adopting the technical scheme, the functional auxiliary agent consisting of the phosphate acrylate and the chlorinated polyolefin in the proportion can play the best role of synergism, so that the functional auxiliary agent has better miscibility, and the waterborne modified two-component PU finishing paint can keep better adhesive force.
Further preferably, 1-3 parts by weight of zirconium carbonate is also added into the component A of the aqueous modified two-component PU finishing paint.
By adopting the technical scheme, the zirconium carbonate can induce hydroxyl and carboxyl on a molecular chain of the acrylic resin to perform a crosslinking reaction to form an interpenetrating network structure, so that the crosslinking density and compactness in the film layer are improved, the electrochemical corrosion of the galvanized material can be effectively inhibited, and the integral adhesive force of the waterborne modified two-component PU finishing paint is greatly improved when the waterborne modified two-component PU finishing paint is sprayed and used on the galvanized material.
More preferably, the aqueous dispersant is any one of sodium dodecyl sulfate, barium stearate, sodium tripolyphosphate and polyacrylamide.
By adopting the technical scheme, the sodium dodecyl sulfate, the barium stearate, the sodium tripolyphosphate and the polyacrylamide can play a good dispersing role, so that the water-based modified two-component PU finish paint can keep a good dispersion system and keep the relatively stable function of the dispersion system, and further the water-based modified two-component PU finish paint has good adhesive force when being sprayed on a galvanized material.
More preferably, the aqueous wetting agent is any one of alkyl polyoxyethylene ether, triethanolamine, polyethylene glycol and tween-80.
By adopting the technical scheme, the wetting agent can reduce the surface tension of the waterborne modified two-component PU finishing paint, so that the waterborne modified two-component PU finishing paint can be spread on the surface of a galvanized material and fully contacts with the galvanized material, and a coating formed by the waterborne modified two-component PU finishing paint on the galvanized material has good adhesive force.
The invention also aims to provide a preparation method of the water-based modified double-component PU finish paint, and the water-based modified double-component PU finish paint prepared by the method has excellent adhesive force and good integral application effect when being sprayed on zinc-plating materials such as cold galvanizing, hot galvanizing and the like.
In order to achieve the second purpose, the invention provides the following technical scheme, which comprises the following steps:
the method comprises the following steps: premixing raw materials, weighing the water-based acrylic resin in a plastic tank according to the corresponding weight part, adding 9-10 parts of deionized water in the plastic tank in the process of loading and stirring, stirring at 600rpm of 500-8 minutes, then respectively adding the defoaming agent and the water-based dispersing agent in the corresponding weight parts, and stirring at 600rpm of 500-8 minutes to obtain a premix;
step two: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate and talcum powder in corresponding parts by weight into the premix, wherein the adding time is 5-10min, the stirring is continuously carried out in the middle, the stirring speed is 500-1200 rpm, 5-6 parts of ionized water is used for cleaning powder adhered to the wall of the tank after the feeding is finished, and then the high-speed dispersion is carried out for 15-20min at 1000-1200rpm to obtain the slurry;
step three: grinding and mixing, grinding the slurry by using a sand mill, stirring on a machine after grinding, firstly adding a thickening agent in corresponding parts by weight, dispersing for 6-10min at 1000rpm of 800-;
step four: adjusting and discharging, adding the corresponding weight part of the water-based carbon black color paste into the semi-finished product, stirring for 4-6min at 500-600rpm, finally adding the corresponding weight part of the water-based wax paste, continuously stirring for 4-6min to obtain a component A, and storing for later use;
step five: preparing a component B, mixing the waterborne polyurethane curing agent and the waterborne isocyanate curing agent in corresponding parts by weight, stirring at the speed of 500-600rpm for 3-5min, adding the propylene glycol monomethyl ether acetate in corresponding parts by weight during stirring, continuously stirring for 8-10min to obtain the component B, and storing for later use.
By adopting the technical scheme, the process can fully mix the raw materials of each component, the obtained component A and the component B have good and stable storage performance, the talcum powder, the fumed silica and the waterborne zinc phosphate can be fully compounded and enhanced, and meanwhile, the production process is simple and convenient to operate and is not easy to generate large pollution.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the talcum powder, the fumed silica and the water-based zinc phosphate are used, and can have good compounding and synergistic effects, so that the water-based modified double-component PU finishing coat has excellent adhesive force when being sprayed on zinc-plating materials such as cold zinc plating, hot zinc plating and the like;
(2) the functional assistant consisting of the phosphate acrylate and the chlorinated polyolefin is added, so that a good bridge function can be realized between a polymer coating and a metal substrate, and the water-based modified double-component PU finishing coat can be well wetted on the substrate. So that the adhesive force of the coating film of the water-based modified double-component PU finishing paint is greatly improved;
(3) the zirconium carbonate is added, so that hydroxyl and carboxyl on a molecular chain of the acrylic resin can be induced to perform a crosslinking reaction to form an interpenetrating network structure, the crosslinking density and compactness in a film layer are improved, the electrochemical corrosion of a galvanized material can be effectively inhibited, and the integral adhesive force of the waterborne modified two-component PU finishing paint is greatly improved when the waterborne modified two-component PU finishing paint is sprayed and used on the galvanized material.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: a water-based modified double-component PU finishing paint comprises a component A and a component B which are independently stored and mixed according to the weight part ratio of 6:1 when in use, wherein the components and the corresponding weight parts are shown in Table 1, and the water-based modified double-component PU finishing paint is prepared by the following steps:
the method comprises the following steps: premixing raw materials, weighing the water-based acrylic resin in a corresponding weight part into a plastic pot, adding 9.5 parts of deionized water in a corresponding weight part while stirring on a machine, stirring for 6 minutes at 550rpm, then respectively adding the defoaming agent in a corresponding weight part and sodium dodecyl sulfate, and stirring uniformly for 6 minutes at 550rpm to obtain a premix;
step two: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate and talcum powder in corresponding parts by weight into a premix, wherein the adding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the powder is dispersed at a high speed of 1100rpm for 17.5min to obtain the slurry;
step three: grinding and mixing, grinding the slurry by using a sand mill, stirring on a machine after grinding, firstly adding a thickening agent in corresponding parts by weight, dispersing for 8min at 900rpm, then adding alkyl polyoxyethylene ether in corresponding parts by weight during stirring, continuously stirring for 6min, then adding dipropylene glycol butyl ether in corresponding parts by weight and deionized water in the rest parts by weight during stirring, and stirring for 5min at 550rpm to obtain a semi-finished product;
step four: adjusting and discharging, adding the corresponding weight part of water-based carbon black color paste into the semi-finished product, stirring at 550rpm for 5min, finally adding the corresponding weight part of water-based wax paste, continuously stirring for 5min to obtain a component A, and storing for later use;
step five: preparing a component B, mixing the waterborne polyurethane curing agent and the waterborne isocyanate curing agent in corresponding parts by weight, stirring at 550rpm for 4min, adding the propylene glycol monomethyl ether acetate in corresponding parts by weight during stirring, continuously stirring for 9min to obtain the component B, and storing for later use.
Note: the water-based acrylic resin in the step is DSM Dismann water-based acrylic resin Neocryl XK-14; the defoaming agent is a Digao TEGO901W defoaming agent; the thickener is Hamming Silite WT-105A polyurethane thickener; the water-based carbon black color paste is sold under the name SEP3170 baking varnish carbon black; the aqueous wax slurry is three-well chemical wax slurry W410; the water-based isocyanate curing agent is Aquolin 269; the waterborne polyurethane curing agent is a waterborne polyurethane curing agent DNW-5500 purchased from Daisy synthetic resin (Zhongshan).
Example 2: the water-based modified double-component PU finishing paint comprises a component A and a component B which are stored independently and mixed according to the weight part ratio of 5:1 when in use, and is different from the finishing paint in the embodiment 1 in that the water-based modified double-component PU finishing paint is prepared by the following steps:
the method comprises the following steps: premixing raw materials, weighing the water-based acrylic resin in a plastic jar according to the corresponding weight part, adding 9 parts of deionized water in the plastic jar in the machine stirring process, stirring for 8 minutes at 500rpm, then respectively adding the defoaming agent in the corresponding weight part and sodium dodecyl sulfate, and stirring for 8 minutes at 500rpm to obtain a premix;
step two: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate and talcum powder in corresponding parts by weight into a premix, wherein the adding time is 5min, the stirring is continuously carried out in the middle, the stirring speed is 600rpm, 5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the powder is dispersed at a high speed of 1000rpm for 20min to obtain the slurry;
step three: grinding and mixing, grinding the slurry by using a sand mill, stirring on a machine after grinding, firstly adding a thickening agent in corresponding parts by weight, dispersing for 10min at 800rpm, then adding alkyl polyoxyethylene ether in corresponding parts by weight during stirring, continuously stirring for 4min, then adding dipropylene glycol butyl ether in corresponding parts by weight and deionized water in the rest parts by weight during stirring, and stirring for 6min at 500rpm to obtain a semi-finished product;
step four: adjusting and discharging, adding the corresponding weight part of water-based carbon black color paste into the semi-finished product, stirring for 6min at 500rpm, finally adding the corresponding weight part of water-based wax paste, continuously stirring for 6min to obtain a component A, and storing for later use;
step five: preparing a component B, mixing the waterborne polyurethane curing agent and the waterborne isocyanate curing agent in corresponding parts by weight, stirring at 500rpm for 5min, adding the propylene glycol monomethyl ether acetate in corresponding parts by weight during stirring, continuously stirring for 10min to obtain the component B, and storing for later use.
Example 3: the water-based modified double-component PU finishing paint comprises a component A and a component B which are stored independently and mixed according to the weight part ratio of 7:1 when in use, and is different from the finishing paint in the embodiment 1 in that the water-based modified double-component PU finishing paint is prepared by the following steps:
the method comprises the following steps: premixing raw materials, weighing the water-based acrylic resin in a corresponding weight part into a plastic pot, adding 10 parts of deionized water in a corresponding weight part while stirring on a machine, stirring for 4 minutes at 600rpm, then respectively adding the defoaming agent in a corresponding weight part and sodium dodecyl sulfate, and stirring for 4 minutes at 600rpm to obtain a premix;
step two: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate and talcum powder in corresponding parts by weight into a premix, wherein the adding time is 10min, the stirring is continuously carried out in the middle, the stirring speed is 500rpm, 6 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the powder is dispersed at a high speed of 200rpm for 15min to obtain the slurry;
step three: grinding and mixing, grinding the slurry by using a sand mill, stirring on a machine after grinding, firstly adding a thickening agent in corresponding parts by weight, dispersing for 6min at 1000rpm, then adding alkyl polyoxyethylene ether in corresponding parts by weight during stirring, continuously stirring for 8min, then adding dipropylene glycol butyl ether in corresponding parts by weight and deionized water in the rest parts by weight during stirring, and stirring for 4min at 600rpm to obtain a semi-finished product;
step four: adjusting and discharging, adding the corresponding weight part of water-based carbon black color paste into the semi-finished product, stirring at 600rpm for 4min, finally adding the corresponding weight part of water-based wax paste, continuously stirring for 4min to obtain a component A, and storing for later use;
step five: preparing a component B, mixing the waterborne polyurethane curing agent and the waterborne isocyanate curing agent in corresponding parts by weight, stirring at 600rpm for 3min, adding the propylene glycol monomethyl ether acetate in corresponding parts by weight during stirring, continuously stirring for 8min to obtain the component B, and storing for later use.
Examples 4 to 5: a water-based modified two-component PU finishing paint is different from the finishing paint in the embodiment 1 in that the components and the corresponding parts by weight are shown in the table 1.
TABLE 1 Components and parts by weight of examples 1-5
Example 6: a water-based modified double-component PU finishing paint is different from the embodiment 1 in that the mass of sodium dodecyl sulfate and the like in the step I is replaced by barium stearate.
Example 7: the difference between the water-based modified two-component PU finishing paint and the embodiment 1 is that sodium dodecyl sulfate and the like in the step I are replaced by sodium tripolyphosphate.
Example 8: a water-based modified two-component PU finishing paint is different from the finishing paint in the embodiment 1 in that the mass of sodium dodecyl sulfate and the like in the step I is replaced by polyacrylamide.
Example 9: the difference between the water-based modified double-component PU finishing paint and the embodiment 1 is that the alkyl polyoxyethylene ether and the like in the step three are replaced by triethanolamine.
Example 10: a water-based modified double-component PU finishing paint is different from the embodiment 1 in that the alkyl polyoxyethylene ether and the like in the step three are replaced by polyethylene glycol.
Example 11: the difference between the water-based modified double-component PU finishing paint and the embodiment 1 is that the alkyl polyoxyethylene ether and the like in the step three are replaced by Tween-80.
Example 12: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 3 parts of linoleic acid in corresponding parts by weight into a premix, wherein the adding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the high-speed dispersion is carried out for 17.5min at 1100rpm to obtain the slurry.
Example 13: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 4 parts of linoleic acid in corresponding parts by weight into a premix, wherein the adding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the high-speed dispersion is carried out for 17.5min at 1100rpm to obtain the slurry.
Example 14: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 5 parts of linoleic acid in corresponding parts by weight into a premix, wherein the adding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the high-speed dispersion is carried out for 17.5min at 1100rpm to obtain the slurry.
Example 15: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 4 parts of functional additive in corresponding parts by weight into a premix, wherein the functional additive is prepared by mixing 4:1 parts by weight of phosphoric acid acrylate and chlorinated polyolefin, the feeding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the powder is dispersed at a high speed of 1100rpm for 17.5min to obtain the slurry.
Example 16: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 2 parts of functional additive in corresponding parts by weight into a premix, wherein the functional additive is prepared by mixing 4:1 parts by weight of phosphoric acid acrylate and chlorinated polyolefin, the feeding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts by weight of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the powder is dispersed at high speed of 1100rpm for 17.5min to obtain the slurry.
Example 17: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 6 parts of functional additive in corresponding parts by weight into a premix, wherein the functional additive is prepared by mixing 4:1 parts by weight of phosphoric acid acrylate and chlorinated polyolefin, the feeding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the powder is dispersed at a high speed of 1100rpm for 17.5min to obtain the slurry.
Example 18: the difference between the water-based modified two-component PU finishing paint and the embodiment 15 is that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 4 parts of functional additive in corresponding parts by weight into a premix, wherein the functional additive is prepared by mixing 5:1 parts by weight of phosphoric acid acrylate and chlorinated polyolefin, the feeding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts by weight of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the powder is dispersed at high speed of 1100rpm for 17.5min to obtain the slurry.
Example 19: the difference between the water-based modified two-component PU finishing paint and the embodiment 15 is that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 2 parts of functional additive in corresponding parts by weight into a premix, wherein the functional additive is prepared by mixing 3:1 parts by weight of phosphoric acid acrylate and chlorinated polyolefin, the feeding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts by weight of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the powder is dispersed at high speed of 1100rpm for 17.5min to obtain the slurry.
Example 20: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 2 parts of zirconium carbonate in corresponding parts by weight into a premix, wherein the adding time is 7.5min, continuously stirring the materials in the middle, the stirring speed is 550rpm, using 5.5 parts of ionized water to clean powder adhered to the wall of a tank after the feeding is finished, and then dispersing the powder at a high speed of 1100rpm for 17.5min to obtain the slurry.
Example 21: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 1 part of zirconium carbonate in corresponding parts by weight into a premix, wherein the adding time is 7.5min, continuously stirring the materials in the middle, the stirring speed is 550rpm, using 5.5 parts of ionized water to clean powder adhered to the wall of a tank after the feeding is finished, and then dispersing the powder at a high speed of 1100rpm for 17.5min to obtain the slurry.
Example 22: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 3 parts of zirconium carbonate in corresponding parts by weight into a premix, wherein the adding time is 7.5min, continuously stirring the materials in the middle, the stirring speed is 550rpm, using 5.5 parts of ionized water to clean powder adhered to the wall of a tank after the feeding is finished, and then dispersing the powder at a high speed of 1100rpm for 17.5min to obtain the slurry.
Comparative example 1: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica and waterborne zinc phosphate in corresponding parts by weight into the premix, wherein the adding time is 7.5min, continuously stirring the materials in the middle, the stirring speed is 550rpm, washing powder adhered to the wall of the tank by using 5.5 parts of deionized water after the feeding is finished, and then dispersing the powder at a high speed of 1100rpm for 17.5min to obtain the slurry.
Comparative example 2: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica and talcum powder in corresponding parts by weight into the premix, wherein the adding time is 7.5min, continuously stirring the middle part at the stirring speed of 550rpm, washing the powder adhered to the wall of the tank by using 5.5 parts of deionized water after the feeding is finished, and then dispersing at the high speed of 1100rpm for 17.5min to obtain the slurry.
Comparative example 3: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding corresponding parts by weight of waterborne zinc phosphate and talcum powder into the premix, wherein the adding time is 7.5min, continuously stirring the mixture in the middle at the stirring speed of 550rpm, washing powder adhered to the wall of the tank by using 5.5 parts of deionized water after the feeding is finished, and then dispersing at the high speed of 1100rpm for 17.5min to obtain the slurry.
Comparative example 4: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: and (2) preparing slurry, sequentially adding talcum powder in corresponding parts by weight into the premix, wherein the adding time is 7.5min, continuously stirring the mixture in the middle, the stirring speed is 550rpm, washing the powder adhered to the wall of the tank by using 5.5 parts of deionized water after the feeding is finished, and dispersing at a high speed of 1100rpm for 17.5min to obtain the slurry.
Comparative example 5: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica in corresponding parts by weight into the premix, wherein the adding time is 7.5min, continuously stirring the mixture in the middle, the stirring speed is 550rpm, washing the powder adhered to the wall of the tank by using 5.5 parts of deionized water after the feeding is finished, and then dispersing the powder at a high speed of 1100rpm for 17.5min to obtain the slurry.
Comparative example 6: a water-based modified two-component PU finishing paint is different from the embodiment 1 in that the step two is specifically set as follows: preparing slurry, sequentially adding corresponding parts by weight of waterborne zinc phosphate into premix, wherein the adding time is 7.5min, continuously stirring the mixture in the middle, the stirring speed is 550rpm, washing the powder adhered to the wall of the tank by using 5.5 parts of deionized water after the feeding is finished, and then dispersing at a high speed of 1100rpm for 17.5min to obtain the slurry.
Comparative example 7: the difference between the water-based modified two-component PU finishing paint and the embodiment 15 is that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 4 parts of functional additive in corresponding parts by weight into a premix, wherein the functional additive is prepared by mixing 2.5:1 parts by weight of phosphoric acid acrylate and chlorinated polyolefin, the feeding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the high-speed dispersion is carried out for 17.5min at 1100rpm to obtain the slurry.
Comparative example 8: the difference between the water-based modified two-component PU finishing paint and the embodiment 15 is that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 4 parts of functional additive in corresponding parts by weight into a premix, wherein the functional additive is prepared by mixing 5.5:1 parts by weight of phosphoric acid acrylate and chlorinated polyolefin, the feeding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the powder is dispersed at a high speed of 1100rpm for 17.5min to obtain the slurry.
Comparative example 9: the difference between the water-based modified two-component PU finishing paint and the embodiment 15 is that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 4 parts of functional additive by weight into premix, wherein the functional additive is phosphoric acid acrylate, the adding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the high-speed dispersion is carried out for 17.5min at 1100rpm to obtain the slurry.
Comparative example 10: the difference between the water-based modified two-component PU finishing paint and the embodiment 15 is that the step two is specifically set as follows: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate, talcum powder and 4 parts of functional additive in corresponding parts by weight into premix, wherein the functional additive is chlorinated polyolefin, the adding time is 7.5min, the stirring is continuously carried out in the middle, the stirring speed is 550rpm, 5.5 parts of deionized water is used for cleaning powder adhered to the wall of a tank after the feeding is finished, and then the high-speed dispersion is carried out for 17.5min at 1100rpm to obtain the slurry.
Effect testing
Test samples: the aqueous modified two-component PU topcoats obtained in examples 1 to 22 were used as test samples 1 to 22, and the aqueous modified two-component PU topcoats obtained in comparative examples 1 to 10 were used as control samples 1 to 10.
The test method comprises the following steps: selecting an aluminum alloy galvanized part as a substrate, then uniformly spraying the aqueous modified double-component PU finishing paint in the test samples 1-22 and the comparison samples 1-10 on the substrate, wherein the construction viscosity is 80S, the film thickness is 35 mu m, baking is carried out at 70 ℃ for 30 minutes, naturally drying is carried out at room temperature (20 ℃) for 6 hours, and 30 standard samples are obtained and tested every other day. And testing according to the standard GB/T5210-2006 by adopting a pull-open method, measuring the adhesive force (MPa) of the coating films on 30 standard samples, and correspondingly recording.
And (3) test results: the test results of the test samples 1 to 22 and the control samples 1 to 10 are shown in Table 2. As can be seen from Table 2, the results of the tests in examples 1-5 and comparative examples 1-6 show that the use of talc powder, fumed silica and waterborne zinc phosphate can provide good compounding and synergistic effects, and the waterborne modified two-component PU topcoat has excellent adhesion when being sprayed on galvanized materials such as cold galvanizing and hot galvanizing. The decibel comparison of the test results of the examples 6 to 8, the examples 9 to 11, and the example 1 shows that the aqueous dispersant and the aqueous wetting agent disclosed by the invention are both suitable for preparing the aqueous modified two-component PU finishing paint, and the obtained aqueous modified two-component PU finishing paint has good and stable adhesion. As can be seen from the comparison of the test results of examples 12 to 14, examples 15 to 19, examples 20 to 20 and example 1, the adhesion of the aqueous modified two-component PU topcoat can be greatly improved by adding linoleic acid, a functional assistant prepared by mixing phosphoric acid acrylate and chlorinated polyolefin, and zirconium carbonate to the component A of the aqueous modified two-component PU topcoat.
TABLE 2 test results of test samples 1-22 and control samples 1-10
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The water-based modified double-component PU finishing paint is characterized by comprising a component A and a component B which are independently stored and mixed according to the weight part ratio of (5-7) to 1 when in use, wherein the component A comprises the following raw materials in parts by weight:
45-48 parts of water-based acrylic resin;
0.15-0.25 part of defoaming agent;
0.5-0.7 part of water-based dispersant;
0.5-0.7 part of fumed silica;
4-6 parts of water-based zinc phosphate;
6-8 parts of talcum powder;
0.3-0.5 part of thickening agent;
3-4 parts of dipropylene glycol butyl ether;
7-8 parts of water-based carbon black color paste;
0.2-0.3 part of water-based wetting agent;
0.1-0.2 part of water-based wax slurry;
28-32 parts of deionized water;
the component B comprises the following raw materials:
35-45 parts of a waterborne polyurethane curing agent;
35-40 parts of a water-based isocyanate curing agent;
20-25 parts of propylene glycol methyl ether acetate.
2. The waterborne modified two-component PU finishing paint according to claim 1, wherein 3-5 parts by weight of linoleic acid is further added into the A component of the waterborne modified two-component PU finishing paint.
3. The waterborne modified two-component PU finishing paint according to claim 1, wherein 2-6 parts by weight of functional additives are further added to the component A of the waterborne modified two-component PU finishing paint, and the functional additives are obtained by mixing phosphoric acid acrylate and chlorinated polyolefin.
4. The waterborne modified two-component PU finishing paint according to claim 3, wherein the weight portion ratio of the phosphate acrylate to the chlorinated polyolefin in the functional auxiliary agent is (3-5): 1.
5. The waterborne modified two-component PU finishing paint according to claim 1, wherein 1-3 parts by weight of zirconium carbonate is further added into the A component of the waterborne modified two-component PU finishing paint.
6. The waterborne modified two-component PU finishing paint according to claim 1, wherein the waterborne dispersant is any one of sodium dodecyl sulfate, barium stearate, sodium tripolyphosphate and polyacrylamide.
7. The waterborne modified two-component PU finishing paint according to claim 1, wherein the waterborne wetting agent is any one of alkyl polyoxyethylene ether, triethanolamine, polyethylene glycol and Tween-80.
8. A method for preparing the aqueous modified two-component PU topcoat as claimed in claim 1, comprising the steps of:
the method comprises the following steps: premixing raw materials, weighing the water-based acrylic resin in a plastic tank according to the corresponding weight part, adding 9-10 parts of deionized water in the plastic tank in the process of loading and stirring, stirring at 600rpm of 500-8 minutes, then respectively adding the defoaming agent and the water-based dispersing agent in the corresponding weight parts, and stirring at 600rpm of 500-8 minutes to obtain a premix;
step two: preparing slurry, sequentially adding fumed silica, waterborne zinc phosphate and talcum powder in corresponding parts by weight into the premix, wherein the adding time is 5-10min, the stirring is continuously carried out in the middle, the stirring speed is 500-1200 rpm, 5-6 parts of ionized water is used for cleaning powder adhered to the wall of the tank after the feeding is finished, and then the high-speed dispersion is carried out for 15-20min at 1000-1200rpm to obtain the slurry;
step three: grinding and mixing, grinding the slurry by using a sand mill, stirring on a machine after grinding, firstly adding a thickening agent in corresponding parts by weight, dispersing for 6-10min at 1000rpm of 800-;
step four: adjusting and discharging, adding the corresponding weight part of the water-based carbon black color paste into the semi-finished product, stirring for 4-6min at 500-600rpm, finally adding the corresponding weight part of the water-based wax paste, continuously stirring for 4-6min to obtain a component A, and storing for later use;
step five: preparing a component B, mixing the waterborne polyurethane curing agent and the waterborne isocyanate curing agent in corresponding parts by weight, stirring at the speed of 500-600rpm for 3-5min, adding the propylene glycol monomethyl ether acetate in corresponding parts by weight during stirring, continuously stirring for 8-10min to obtain the component B, and storing for later use.
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