CN112029392B - Water-based double-component white primer and preparation method thereof - Google Patents
Water-based double-component white primer and preparation method thereof Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
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- 239000002562 thickening agent Substances 0.000 claims abstract description 18
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- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 claims description 4
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- ZTMNRKZFOYFOIE-UHFFFAOYSA-N 1-butoxyhexyl acetate Chemical group C(C)(=O)OC(CCCCC)OCCCC ZTMNRKZFOYFOIE-UHFFFAOYSA-N 0.000 description 1
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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
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—Priming paints
-
- 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
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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
- C09D7/43—Thickening agents
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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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- 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
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses a water-based two-component white primer and a preparation method thereof, and relates to the technical field of water-based coatings, wherein the water-based two-component white primer 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, and the component A comprises the following raw materials in parts by weight: 35-45 parts of hydroxy acrylic resin; 0.2-0.5 part of wetting agent; 1.8-5.1 parts of a defoaming agent; 2-4 parts of a film-forming assistant; 0.35-1.2 parts of thickening rheological mixing auxiliary agent; 1-3 parts of a dispersant; 28-35 parts of titanium dioxide; 5-8 parts of talcum powder; 0.1-0.3 part of preservative; 1-3 parts of a grinding aid; 10-15 parts of water; the component B is a water-based isocyanate curing agent; the hydroxyl content in the hydroxyl acrylic resin is 1-2%; the thickening rheological mixing auxiliary agent is prepared by mixing a low-shear thickening agent, a silicate rheological agent and plant cellulose. The water-based two-component white primer disclosed by the invention has excellent miliaria resistance under forced drying, excellent thermal stability and good sagging resistance.
Description
Technical Field
The invention relates to the technical field of water-based paint, in particular to a water-based double-component white primer 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 seal white primer and a preparation method thereof in Chinese invention patent application with the publication number of CN109370398A, wherein the primer comprises a component A and a component B, and the weight ratio of the component A to the component B is 1: (0.1-0.35); wherein the component A comprises the following components in parts by weight: 5-10 parts of water, 0.01-1 part of pH regulator, 0.2-1 part of defoamer, 0.6-2 parts of dispersant, 0.5-5 parts of antifreeze and 5-15 parts of triple superphosphate; 5-15 parts of talcum powder, 10-15 parts of titanium dioxide, 45-60 parts of hydroxyl acrylic resin, 1-5 parts of a film-forming additive, 0.5-2 parts of a wetting agent, 0.1-2 parts of a wetting and leveling agent, 0.1-2 parts of a sterilization and mildew-proof agent and 0.2-2 parts of a thickening agent; the component B is an isocyanate curing agent.
In the application documents, the two-component white primer is slow to dry, the conventional water-based two-component paint needs to be dried firstly (at the temperature and humidity of 25 ℃/50-65% RH, the surface is dried for 30-60min), then forced drying is carried out (at the temperature of 35-45 ℃, the humidity of less than 20% RH, the drying time is 8-12h), the drying time acceptable for furniture enterprises is 4-6h, but the forced drying of the water-based paint is prone to miliaria, dark bubbles and the like. When the filling property is improved, the stability of the product is poor, the water-based resin cannot well wet and wrap the powder, and the conditions of quick viscosity rise or direct gelatinization and the like are easy to occur. Meanwhile, because the medium density fiberboard needs to be closed in two processes, the filling property is not improved enough through the formula, and the coating weight needs to be increased to increase the thickness of a paint film, the sagging of the water-based paint under high filling is a great challenge, especially for workpieces with the requirement of vertical surface sagging. Therefore, a new solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the water-based two-component white primer, which is used for solving the technical problems and has excellent miliaria resistance under forced drying, excellent thermal stability, good filling and covering properties and good sagging resistance.
In order to achieve the first purpose, the invention provides the following technical scheme:
the water-based two-component white primer 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:
35-45 parts of hydroxy acrylic resin;
0.2-0.5 part of wetting agent;
1.8-5.1 parts of a defoaming agent;
2-4 parts of a film-forming assistant;
0.35-1.2 parts of thickening rheological mixing auxiliary agent;
1-3 parts of a dispersant;
28-35 parts of titanium dioxide;
5-8 parts of talcum powder;
0.1-0.3 part of preservative;
1-3 parts of a grinding aid;
10-15 parts of water;
the component B is a water-based isocyanate curing agent;
the hydroxyl content in the hydroxyl acrylic resin is 1-2%; the thickening rheological mixing auxiliary agent is prepared by mixing a low-shear thickening agent, a silicate rheological agent and plant cellulose.
By adopting the technical scheme, the waterborne acrylic resin is prepared from the copolymer resin with active crosslinkable functional groups, and the multi-system thermosetting coating is added with or without crosslinking resin during paint preparation, so that the active functional groups are crosslinked into a paint film with a three-dimensional structure during film forming. The hydroxyl content in the selected hydroxyl acrylic resin is 1-2%, the advantage of the low-hydroxyl resin in drying time is larger than that of the high-hydroxyl resin, the production requirement of a customer can be met, the hydroxyl content is 1-2%, the hydroxyl acrylic resin can have good wrapping property on powder, the obtained water-based two-component white primer is extremely stable in viscosity, the polishing property and the filling property are excellent, and the overall thermal stability and the filling covering property are excellent. Meanwhile, when the low-shear thickening agent, the silicate rheological agent and the plant cellulose are mixed and mixed to be used as the thickening rheological mixing auxiliary agent, the low-shear thickening agent, the silicate rheological agent and the plant cellulose can play a good compounding synergistic effect mutually, the overall anti-sagging performance of the water-based two-component white primer can be greatly improved, and the water-based two-component white primer is mixed with the defoaming agent for use, has a strong foam stabilizing effect, is not easy to generate miliaria, hidden bubbles and the like in a forced drying process, and further greatly improves the overall quality of the water-based two-component white primer.
Further preferably, the thickening rheological mixing aid comprises the following components in parts by weight:
0.1-0.5 part of low shear thickening agent;
0.2-0.5 part of silicate rheological agent;
0.05-0.2 part of plant cellulose.
By adopting the technical scheme, the plant cellulose has good toughness, dispersibility and chemical stability, strong water absorption capacity and very excellent thickening and anti-cracking performance; the silicate rheological agent can adjust the fluidity of the aqueous two-component white primer, and can improve the thermal stability and the filling adsorption performance of the aqueous two-component white primer; low shear thickener shear is a thickener that provides excellent rheological thixotropic properties, good thickening effect by association. The thickening rheological mixing assistant prepared by mixing the components in the ratio can play the best anti-sagging effect on the water-based two-component white primer.
More preferably, the defoaming agent is any one or a mixture of BYK-022, TEGO902W, TEGO 822 and BYK-AQ.
By adopting the technical scheme, the defoaming agent of the type can exert good and stable defoaming performance, and the excellent defoaming can ensure that bubbles in the paint film are removed before surface drying, thereby avoiding the defects of needle holes, dark bubbles and the like caused by remaining in the paint film.
Further preferably, the defoaming agent comprises the following components in parts by weight:
BYK-0220.2-0.5 part;
0.3-0.8 part of TEGO 902W;
TEGO 8220.3-0.8 parts;
1-3 parts of BYK-AQ.
By adopting the technical scheme, the defoaming agent with the type and the mixing ratio can exert excellent foam stabilizing effect.
More preferably, the film-forming assistant is any one of hexylene glycol butyl ether acetate, dodecyl alcohol ester and dipropylene glycol monomethyl ether.
By adopting the technical scheme, the film-forming auxiliary agent has good compatibility with other components, the lowest film-forming temperature of the hydroxy acrylic resin can be reduced, the appearance and the luster of a paint film cannot be influenced, and the paint film has good storage stability.
More preferably, the 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 water-based two-component white primer, so that the water-based two-component white primer can be spread on the construction surface and fully contacted with the surface of an object to be coated, and a paint film formed by the water-based two-component white primer on a galvanized material has good adhesive force.
More preferably, the 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 two-component white primer can keep a good dispersion system, the relative stability of the dispersion system is kept, the whole water-based two-component white primer has good adhesive force when in use, and a formed paint film is more uniform and stable.
More preferably, the preservative is DOW342 sterilization and mildew prevention agent.
By adopting the technical scheme, the Dow342 bactericidal mildew preventive is selected, so that the acid and alkali corrosion resistance of the water-based double-component white primer paint film can be improved, mass propagation of bacteria can be inhibited, the paint viscosity is not easy to decrease and decay, and the stability of the water-based double-component white primer in the application process is greatly improved.
More preferably, the grinding aid is D.BASF BASF Hydropalat SL 3697(Perenol 1097A).
By adopting the technical scheme, in order to improve the polishing performance of the paint film, the polishing auxiliary agent can be added, has good compatibility with other component raw materials, has good integral dispersion performance, is not easy to separate out and layer in the application process, and can further ensure the integral quality of the water-based double-component white primer.
The invention also aims to provide a preparation method of the water-based two-component white primer, and the water-based two-component white primer prepared by the method has excellent miliaria resistance under forced drying, excellent thermal stability, good filling and covering properties and good sagging resistance.
In order to achieve the second purpose, the invention provides the following technical scheme that the preparation method of the water-based two-component white primer 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-;
step two: preparing slurry, sequentially adding titanium dioxide and talcum powder in corresponding parts by weight into the premix for 5-10min, continuously stirring the mixture in the middle at the stirring speed of 500-1200 rpm, washing the powder adhered to the wall of the tank by using 5-6 parts of ionized water after the feeding is finished, and dispersing the powder at the high speed of 1000-1200rpm for 15-20min to obtain the slurry;
step three: grinding and mixing, grinding the slurry by using a sand mill, stirring on a machine after grinding, adding a thickening rheological mixing aid in corresponding parts by weight, dispersing for 6-10min at 800-plus-one rotation speed of 1000rpm, adding a wetting agent in corresponding parts by weight during stirring, continuously stirring for 4-8min, adding a film-forming aid in corresponding parts by weight and deionized water in the remaining parts by weight during stirring, and stirring for 4-6min at 500-plus-one rotation speed of 600rpm to obtain a semi-finished product;
step four: adjusting and discharging, adding the preservative and the grinding aid in corresponding parts by weight into the semi-finished product, stirring at 500-600rpm for 4-6min to obtain a component A, and storing for later use;
step five: preparing the component B, adding the isocyanate curing agent with the corresponding weight part into a stirring tank, stirring at 500-600rpm for 8-12min, filling nitrogen into the stirring tank in vacuum to obtain the component B, and storing the component B for later use.
By adopting the technical scheme, the process can fully mix the raw materials of the components, the obtained component A and the component B have good and stable storage performance, and the thickening rheological mixing auxiliary can play a good and excellent synergistic effect in the using process, so that the water-based two-component white primer with excellent quality is obtained.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the hydroxyl content in the selected hydroxyl acrylic resin is 1-2%, so that the hydroxyl acrylic resin has good wrapping property on powder, the viscosity of the obtained water-based double-component white primer is extremely stable, the polishing property and the filling property are excellent, and the overall thermal stability and the filling covering property are excellent;
(2) when the low-shear thickening agent, the silicate rheological agent and the plant cellulose are mixed and mixed to be used as the thickening rheological mixing auxiliary agent, the low-shear thickening agent, the silicate rheological agent and the plant cellulose can play a good compounding synergistic effect mutually, the overall anti-sagging performance of the water-based two-component white primer can be greatly improved, and the water-based two-component white primer is mixed with the defoaming agent for use, has a strong foam stabilizing effect, is not easy to generate miliaria, hidden bubbles and the like in a forced drying process, and further greatly improves the overall quality of the water-based two-component white primer;
(3) when BYK-022, TEGO902W, TEGO 822 and BYK-AQ are compounded and mixed to be used as a defoaming agent, good and stable defoaming performance can be exerted, and excellent defoaming can ensure that bubbles in a paint film can be removed before surface drying, thereby avoiding the defects of needle holes, dark bubbles and the like caused by remaining in the paint film.
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 two-component white primer comprises a component A and a component B which are separately 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 are 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 and the dispersing agent in corresponding weight parts, and stirring uniformly at 550rpm for 6 minutes to obtain a premix;
step two: preparing slurry, sequentially adding titanium dioxide and talcum powder in corresponding parts by weight into the premix, wherein the adding time is 7.5min, continuously stirring the mixture in the middle 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 the powder 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, adding a thickening rheological mixing aid in a corresponding weight part, dispersing for 8min at 900rpm, adding a wetting agent in a corresponding weight part during stirring, continuously stirring for 6min, adding a film-forming aid in a corresponding weight part and deionized water in the remaining weight part during stirring, and stirring for 5min at 550rpm to obtain a semi-finished product;
step four: adjusting and discharging, adding the preservative and the grinding aid in corresponding parts by weight into the semi-finished product, stirring at 550rpm for 5min to obtain a component A, and storing for later use;
step five: preparing a component B, adding the isocyanate curing agent in a corresponding weight part into a stirring tank, stirring at 550rpm for 10min, filling nitrogen into the tank in vacuum to obtain the component B, and storing the component B for later use.
Note: in the step, the content of hydroxyl in the hydroxyl acrylic resin is 1.5 percent; the thickening rheological mixing auxiliary agent is obtained by mixing a low-shear thickening agent, a silicate rheological agent and plant cellulose, wherein the low-shear thickening agent is Haimax 288, the silicate rheological agent is BYK-S482, and the plant cellulose is Raufos F01-V; the defoaming agent is prepared by mixing BYK-022, TEGO902W, TEGO 822 and BYK-AQ; the preservative is selected from Dow342 sterilization and mildew-proof agent; the grinding aid is D.BASF BASF Hydropalat SL 3697(Perenol 1097A); the film-forming auxiliary agent is hexanediol butyl ether acetate; the wetting agent is alkyl polyoxyethylene ether; the dispersant is sodium dodecyl sulfate.
Example 2: a two-component water-based white primer, which is different from the one prepared in example 1 in that:
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 process of machine stirring, stirring for 8 minutes at 500rpm, then respectively adding the defoaming agent and the dispersing agent in the corresponding weight parts, and stirring for 4 minutes at 600rpm to obtain a premix;
step two: preparing slurry, sequentially adding titanium dioxide and talcum powder in corresponding parts by weight into premix for 5min, continuously stirring the mixture at a stirring speed of 600rpm, washing the powder adhered to the wall of the tank by using 5 parts of deionized water after the feeding is finished, and dispersing the powder for 15min at a high speed of 1200rpm to obtain the slurry;
step three: grinding and mixing, grinding the slurry by using a sand mill, stirring on a machine after grinding, adding a thickening rheological mixing aid in a corresponding weight part, dispersing for 10min at 800rpm, adding a wetting agent in a corresponding weight part during stirring, continuously stirring for 4min, adding a film-forming aid in a corresponding weight part and deionized water in the remaining weight part during stirring, and stirring for 4min at 600rpm to obtain a semi-finished product;
step four: adjusting and discharging, adding the preservative and the grinding aid in corresponding parts by weight into the semi-finished product, stirring at 500rpm for 6min to obtain a component A, and storing for later use;
step five: and (3) preparing a component B, adding the isocyanate curing agent in a corresponding weight part into a stirring tank, stirring at 600rpm for 8min, filling nitrogen into the stirring tank in vacuum to obtain the component B, and storing the component B for later use.
Example 3: a two-component water-based white primer, which is different from the one prepared in example 1 in that:
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 10 parts of deionized water in the corresponding weight part during machine stirring, stirring at 600rpm for 4 minutes, then respectively adding the defoaming agent and the dispersing agent in the corresponding weight part, and stirring at 500rpm for 8 minutes to obtain a premix;
step two: preparing slurry, sequentially adding titanium dioxide and talcum powder in corresponding parts by weight into a premix for 10min, continuously stirring the mixture at a stirring speed of 500rpm, washing the powder adhered to the wall of the tank by using 6 parts of deionized water after the feeding is finished, and dispersing the powder 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, adding a thickening rheological mixing auxiliary agent in a corresponding weight part, dispersing for 6min at 1000rpm, adding a wetting agent in a corresponding weight part during stirring, continuously stirring for 8min, adding a film-forming auxiliary agent in a corresponding weight part and deionized water in the rest weight part during stirring, and stirring for 6min at 500rpm to obtain a semi-finished product;
step four: adjusting and discharging, adding the preservative and the grinding aid in corresponding parts by weight into the semi-finished product, stirring at 600rpm for 4min to obtain a component A, and storing for later use;
step five: preparing a component B, adding the isocyanate curing agent in a corresponding weight part into a stirring tank, stirring at 500rpm for 12min, filling nitrogen into the stirring tank in vacuum to obtain the component B, and storing the component B for later use.
Examples 4 to 5: a water-borne two-component white primer, which differs from example 1 in that the components and their respective parts by weight are shown in table 1.
TABLE 1 Components and parts by weight of examples 1-5
Example 6: a water-based two-component white primer is different from the primer in example 1 in that the hydroxyl group content in the hydroxyl acrylic resin in the above step is 1%.
Example 7: a water-based two-component white primer is different from the primer in example 1 in that the hydroxyl group content in the hydroxyl acrylic resin in the above step is 2%.
Example 8: the difference between the water-based two-component white primer and the embodiment 1 is that the film-forming assistant in the step is dodecyl alcohol ester.
Example 9: a water-based two-component white primer is different from the primer in example 1 in that dipropylene glycol monomethyl ether is used as a film-forming aid in the above step.
Example 10: the difference between the water-based two-component white primer and the embodiment 1 is that triethanolamine is used as a wetting agent in the steps.
Example 11: the difference between the water-based two-component white primer and the embodiment 1 is that the wetting agent in the step is tween-80.
Example 12: the difference between the water-based two-component white primer and the embodiment 1 is that barium stearate is selected as the dispersing agent in the step.
Example 13: the difference between the water-based two-component white primer and the embodiment 1 is that polyacrylamide is selected as the dispersing agent in the steps.
Example 14: a water-based two-component white primer is different from the primer in example 1 in that a component A and a component B are mixed according to the weight part ratio of 5: 1.
Example 15: a water-based two-component white primer is different from the primer in example 1 in that a component A and a component B are mixed according to a weight part ratio of 7: 1.
Comparative example 1: a two-component water-based white primer is different from the one in example 1 in that the hydroxyl group content in the hydroxyl acrylic resin in the above step is 0.9%.
Comparative example 2: a two-component water-based white primer is different from the one in example 1 in that the hydroxyl group content in the hydroxyl acrylic resin in the above step is 2.1%.
Comparative example 3: the water-based two-component white primer is different from the water-based two-component white primer in example 1 in that the thickening rheological mixing auxiliary agent in the step is obtained by mixing a low-shear thickening agent and plant cellulose.
Comparative example 4: the water-based two-component white primer is different from the water-based two-component white primer in example 1 in that the thickening rheological mixing auxiliary agent in the step is obtained by mixing a silicate rheological agent and plant cellulose.
Comparative example 5: the difference between the water-based two-component white primer and the water-based two-component white primer in the embodiment 1 is that the thickening rheological mixing auxiliary agent in the step is obtained by mixing a low-shear thickening agent and a silicate rheological agent.
Comparative example 6: a water-based two-component white primer is different from the water-based two-component white primer in example 1 in that the defoaming agent in the step is prepared by mixing BYK-022, TEGO 822 and BYK-AQ.
Comparative example 7: a water-based two-component white primer is different from the primer in example 1 in that the defoaming agent in the step is prepared by mixing BYK-022, TEGO902W and BYK-AQ.
Comparative example 8: a water-based two-component white primer is different from the primer in example 1 in that the defoaming agent in the step is obtained by mixing TEGO902W, TEGO 822 and BYK-AQ.
Comparative example 9: a water-based two-component white primer is different from example 1 in that the defoaming agent in the above step is obtained by mixing BYK-022, TEGO902W and TEGO 822.
Comparative example 10: the water-based two-component white primer is different from the water-based two-component white primer in the embodiment 1 in that the thickening rheological mixing auxiliary agent in the step comprises the following components in parts by weight: 0.09 part of low-shear thickening agent; 0.52 part of silicate rheological agent; 0.04 part of plant cellulose.
Comparative example 11: the water-based two-component white primer is different from the water-based two-component white primer in the embodiment 1 in that the thickening rheological mixing auxiliary agent in the step comprises the following components in parts by weight: 0.51 part of low-shear thickening agent; 0.18 part of silicate rheological agent; 0.21 part of plant cellulose.
Comparative example 12: the water-based two-component white primer is different from the primer in example 1 in that the defoamer in the step comprises the following components in parts by weight: BYK-0220.19 parts; TEGO902W 0.81 parts; TEGO 8220.81 parts; 0.9 part of BYK-AQ.
Comparative example 13: the water-based two-component white primer is different from the primer in example 1 in that the defoamer in the step comprises the following components in parts by weight: BYK-0220.51 parts; TEGO902W 0.29 parts; TEGO 8220.29 parts; 3.1 parts of BYK-AQ.
Performance test samples: the water-based two-component white primers obtained in examples 1 to 15 were used as test samples 1 to 15, and the water-based two-component white primers obtained in comparative examples 1 to 13 were used as control samples 1 to 13.
The test method comprises the following steps: an aluminum alloy galvanized part is selected as a substrate, then the water-based two-component white primer in the test samples 1-22 and the comparison samples 1-10 is uniformly sprayed on the substrate, the construction viscosity is 80S, the film thickness is 35 mu m, the substrate is baked at 35 ℃ for 4 hours, and naturally dried at room temperature (20 ℃) for 6 hours to obtain 28 standard samples, and the test is carried out every other day. And (3) detecting and recording the in-tank foam stability (no foam at night), construction defoaming (defoaming in 1min and no needle hole), dry film defoaming (no needle hole and miliaria), sagging prevention (sagging instrument film thickness) and heat storage stability (50 ℃ heat storage state), wherein the performance score is 0-5, and the larger the number is, the better the performance is.
And (3) test results: the test results of the test samples 1 to 15 and the control samples 1 to 13 are shown in Table 2. As can be seen from Table 2, the comparison of the test results of examples 1-5 and comparative examples 1-2 shows that the hydroxyl content in the selected hydroxyl acrylic resin is 1-2%, which can greatly improve the overall quality of the water-based two-component white primer. The comparison of the test results of the embodiment 1, the comparative examples 3-6 and the comparative examples 7-9 can be made, and when the low shear thickening agent, the silicate rheological agent and the plant cellulose are mixed and used as the thickening rheological mixing auxiliary agent, and BYK-022, TEGO902W, TEGO 822 and BYK-AQ are compounded and mixed and used as the defoaming agent, the overall quality of the water-based two-component white primer can be greatly improved. By comparing the test results of example 1 with comparative examples 10 to 11 and comparative examples 12 to 13, the selection of the proportions of the components of the thickening rheology mixing aid and the proportions of the components of the defoamer can obtain a high-quality aqueous two-component white primer.
TABLE 2 test results of test samples 1-15 and control samples 1-13
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 (7)
1. The water-based double-component white primer 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:
35-45 parts of hydroxy acrylic resin;
0.2-0.5 part of wetting agent;
1.8-5.1 parts of a defoaming agent;
2-4 parts of a film-forming assistant;
0.35-1.2 parts of thickening rheological mixing auxiliary agent;
1-3 parts of a dispersant;
28-35 parts of titanium dioxide;
5-8 parts of talcum powder;
0.1-0.3 part of preservative;
1-3 parts of a grinding aid;
10-15 parts of water;
the component B is a water-based isocyanate curing agent;
the hydroxyl content in the hydroxyl acrylic resin is 1-2%; the thickening rheological mixing auxiliary agent is prepared by mixing 0.1-0.5 part of low-shear thickening agent, 0.2-0.5 part of silicate rheological agent and 0.05-0.2 part of plant cellulose;
the defoaming agent is prepared by mixing BYK-0220.2-0.5 part, TEGO902W 0.3-0.8 part, TEGO 8220.3-0.8 part and BYK-AQ 1-3 parts.
2. The water-based two-component white primer according to claim 1, wherein the film forming aid is any one of hexylene glycol butyl ether acetate, dodecyl alcohol ester and dipropylene glycol monomethyl ether.
3. The water-based two-component white primer according to claim 1, wherein the wetting agent is selected from any one of alkyl polyoxyethylene ether, triethanolamine, polyethylene glycol and tween-80.
4. The water-based two-component white primer according to claim 1, wherein the dispersant is any one of sodium dodecyl sulfate, barium stearate, sodium tripolyphosphate and polyacrylamide.
5. The aqueous two-component white primer according to claim 1, wherein the preservative is selected from DOW342 bactericidal and mildewproof agents.
6. The water-based two-component white primer according to claim 1, wherein the polishing aid is D.BASF BASF Hydropalat SL 3697 polishing aid.
7. A method of preparing the aqueous two-component white primer according to claim 1, comprising the steps of:
the method comprises the following steps: premixing raw materials, weighing the corresponding weight parts of water-based acrylic resin into a plastic tank, adding 9-10 parts of deionized water into the plastic tank during machine stirring, stirring at 600rpm for 4-8 minutes, then respectively adding the corresponding weight parts of defoaming agent and dispersing agent, and stirring at 600rpm for 4-8 minutes to obtain a premix;
step two: preparing slurry, sequentially adding titanium dioxide and talcum powder in corresponding parts by weight into the premix for 5-10min, continuously stirring the mixture in the middle at the stirring speed of 500-1200 rpm, washing the powder adhered to the wall of the tank by using 5-6 parts of deionized water after the feeding is finished, and dispersing the powder at the high speed of 1000-1200rpm for 15-20min to obtain the slurry;
step three: grinding and mixing, grinding the slurry by using a sand mill, stirring on a machine after grinding, adding a thickening rheological mixing aid in corresponding parts by weight, dispersing for 6-10min at 800-plus-one rotation speed of 1000rpm, adding a wetting agent in corresponding parts by weight during stirring, continuously stirring for 4-8min, adding a film-forming aid in corresponding parts by weight and deionized water in the remaining parts by weight during stirring, and stirring for 4-6min at 500-plus-one rotation speed of 600rpm to obtain a semi-finished product;
step four: adjusting and discharging, adding the preservative and the grinding aid in corresponding parts by weight into the semi-finished product, stirring at 500-600rpm for 4-6min to obtain a component A, and storing for later use;
step five: preparing the component B, adding the isocyanate curing agent with the corresponding weight part into a stirring tank, stirring at 500-600rpm for 8-12min, filling nitrogen into the stirring tank in vacuum to obtain the component B, and storing the component B for later use.
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| CN115960498B (en) * | 2022-09-21 | 2024-03-15 | 上海君子兰新材料股份有限公司 | Aqueous two-component solid color finishing paint for woodware and preparation method thereof |
| CN115960526A (en) * | 2022-11-03 | 2023-04-14 | 上海君子兰新材料股份有限公司 | Preparation method of water-based skin-feel solid-color finish paint |
| CN115627104A (en) * | 2022-11-07 | 2023-01-20 | 清远华湾材料研究院有限公司 | High-covering-power double-component water-based white paint and preparation method thereof |
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Effective date of registration: 20240202 Address after: 475000 northeast corner of the intersection of Zhongzhou Road and Xueyuan Road, industrial cluster area, Lankao County, Kaifeng City, Henan Province Patentee after: Henan Libang changrunfa technology material Co.,Ltd. Country or region after: China Address before: No. 578, Xiasheng Road, Jinshan second industrial zone, Shanghai, 201599 Patentee before: SHANGHAI LIBANG CHANGRUNFA COATING Co.,Ltd. Country or region before: China |