CN114106648B - Water-based single-component primer surfacer and preparation method and application thereof - Google Patents
Water-based single-component primer surfacer and preparation method and application thereof Download PDFInfo
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- CN114106648B CN114106648B CN202111472999.6A CN202111472999A CN114106648B CN 114106648 B CN114106648 B CN 114106648B CN 202111472999 A CN202111472999 A CN 202111472999A CN 114106648 B CN114106648 B CN 114106648B
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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
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/003—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
- C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
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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
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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
- C09D7/63—Additives non-macromolecular organic
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Abstract
The invention discloses a water-based single-component primer surfacer and a preparation method and application thereof, belonging to the technical field of automobile refinishing paints; the invention provides a water-based single-component middle coating primer which comprises the following components in parts by weight: 30-45 parts of acrylic emulsion, 5-15 parts of deionized water, 2-10 parts of wetting dispersant, 0.1-0.5 part of wetting agent, 30-55 parts of filler, 0.1-0.5 part of carbon black, 0.5-1.5 parts of silicon dioxide, 5-8 parts of waterborne zinc stearate emulsion, 1-5 parts of mixed solution of deionized water and butanediol and 0.1-1 part of rheological additive; the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is (5-8): 1, the acrylic emulsion is of a core-shell structure; the water-based single-component primer surfacer provided by the technical scheme of the invention has the advantages of high drying speed, good adhesive force, good grinding property, and friendly upper paint surface, and can be applied to automobile repair; meanwhile, the preparation method of the water-based single-component primer surfacer provided by the technical scheme of the invention is simple, convenient to operate and easy for industrial production.
Description
Technical Field
The invention belongs to the technical field of automobile refinishing paints, and particularly relates to a water-based single-component floating coat primer as well as a preparation method and application thereof.
Background
At present, the domestic automobile refinishing paint market mainly adopts a solvent system, wherein a large amount of Volatile Organic Compounds (VOC) are discharged to cause pollution to the atmospheric environment, however, with the formulation of national mandatory standards and the enhancement of environmental awareness of consumers, the solvent-based paint is gradually replaced by healthy and environment-friendly paint; the water-based paint replaces an organic solvent with a large amount of water, the volatilization amount of the organic solvent is greatly reduced in the production and construction processes, the water-based paint is an important development direction of environment-friendly paint, and the research and development of the water-based paint are imperative.
With the acceleration of life rhythm, consumers put forward higher requirements on the rapid repair of automobiles, in the 'three-coating one-baking' automobile repair process, after a primer is dried to a proper degree, polishing is carried out to remove oil, and then finish paint spraying is carried out, so how to improve the drying speed and the polishing performance of the primer under the condition of not influencing the adhesive force of a paint film has important influence on the rapid repair of the automobiles.
Disclosure of Invention
The invention aims to provide a water-based single-component primer surfacer which is high in drying speed, good in adhesive force, good in polishing property and friendly to a top coat, and a preparation method and application thereof.
In order to realize the purpose, the invention adopts the technical scheme that: a water-based one-component basecoat comprising the following components in parts by weight: 30-45 parts of acrylic emulsion, 5-15 parts of deionized water, 2-10 parts of wetting dispersant, 0.1-0.5 part of wetting agent, 30-55 parts of filler, 0.1-0.5 part of carbon black, 0.5-1.5 parts of silicon dioxide, 5-8 parts of waterborne zinc stearate emulsion, 1-5 parts of mixed solution of deionized water and butanediol and 0.1-1 part of rheological additive; the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is (5-8): 1; the acrylic emulsion is of a core-shell structure.
The technical scheme of the invention provides a water-based single-component primer surfacer, which selects acrylic emulsion with a core-shell structure and water-based zinc stearate emulsion with a proper proportion as additive components, wherein on one hand, the acrylic emulsion with the core-shell structure contains a proper amount of organic solvent, which can improve the drying speed and the adhesive force of the water-based single-component primer surfacer, and the organic solvent is wrapped in the shell layer of the acrylic emulsion and can keep the stability of the acrylic emulsion, on the other hand, the water-based zinc stearate emulsion contains zinc stearate, which has unique fineness hierarchical design and good leveling property in the primer, so that a paint film is formed into a fine film, which is beneficial to reducing sand holes after the paint film is polished and can effectively improve the polishing property and the drying speed.
As a preferred embodiment of the aqueous one-component basecoat of the present invention, the acrylic emulsion includes a core monomer mixture, a shell monomer mixture, an emulsifier, an initiator, and a pH adjuster; the core monomer mixture comprises at least two of styrene, (meth) acrylic acid, methyl (meth) acrylate, butyl (meth) acrylate; the shell layer monomer mixture comprises methyl methacrylate, butyl acrylate, xylene and butyl acetate.
The substances are respectively used as the shell layer and the core layer of the acrylic emulsion, so that the stability of the core-shell structure of the prepared acrylic emulsion with the core-shell structure can be ensured.
As a preferred embodiment of the water-based one-component primer surfacer of the present invention, the sum of the mass percentages of xylene and butyl acetate in the shell monomer mixture is 4.76 to 9.09%.
As a preferred embodiment of the water-based single-component primer surfacer of the present invention, the mass ratio of the core monomer mixture to the shell monomer mixture is (0.8-1): 1.
when the mass ratio of the core monomer mixture to the shell monomer mixture is within the above range, the stability of the core-shell structure of the prepared acrylic emulsion with the core-shell structure can be ensured, and the adhesive force can be improved.
As a preferred embodiment of the aqueous one-component basecoat of the present invention, the ratio of the mass of the initiator to the sum of the mass of the core monomer mixture and the shell monomer mixture is (0.004-0.006): 1; the ratio of the mass of the emulsifier to the sum of the mass of the core monomer mixture and the mass of the shell monomer mixture is (0.004-0.006): 1.
as a preferred embodiment of the waterborne one-component basecoat of the present invention, the emulsifier is sodium lauryl sulfate.
As a preferable embodiment of the water-based one-component primer surfacer of the present invention, the initiator is an aqueous solution of potassium persulfate having a mass fraction of 1%.
As a preferred embodiment of the waterborne one-component basecoat of the present invention, the pH adjustor is at least one of triethylamine, tripropylamine, triethanolamine, diethylenetriamine, dimethylethanolamine, or ammonia.
As a preferred embodiment of the water-based one-component basecoat of the present invention, the filler includes titanium dioxide, talc and kaolin.
As a preferred embodiment of the water-borne one-component basecoat according to the present invention, the filler comprises the following components in parts by weight: 15-25 parts of titanium dioxide, 10-20 parts of talcum powder and 5-10 parts of kaolin.
As a preferred embodiment of the water-based one-component basecoat of the present invention, the talc has a mesh size of 1250 mesh.
When the selected filler is added in the proportion of the weight parts, the effects of the filler, the filler and the filler can be fully exerted, so that the prepared product is fine and smooth in film forming, is beneficial to stirring in the preparation process, has sufficient fluidity and can be better dispersed.
As a preferred embodiment of the water-borne one-component basecoat according to the invention, the silica is fumed silica.
As a preferred embodiment of the aqueous one-component basecoat of the present invention, the rheological aid is a thickener.
As a preferred embodiment of the waterborne one component basecoat of the present invention, the rheological agent is a nonionic polyurethane thickener.
As a preferred embodiment of the water-based single-component primer surfacer, the mass ratio of the deionized water to the butanediol in the mixed solution of the deionized water and the butanediol is 1 (0.5-4).
As a preferred embodiment of the water-based single-component primer surfacer of the present invention, the mass ratio of the deionized water to the butanediol in the mixed solution of the deionized water and the butanediol is 1.
The mixture of deionized water and butanediol with a proper amount is added into the formula, so that on one hand, a proper amount of organic solvent exists in the product, the drying speed and the storage stability of the prepared product are improved, and on the other hand, the problem of damage to other components caused by directly adding the organic solvent can be avoided.
As a preferred embodiment of the waterborne one-component basecoat of the present invention, the carbon black is a low pigment carbon black.
As a preferred embodiment of the water-based one-component basecoat primer of the present invention, the fumed silica is Textilene R972.
As a preferred embodiment of the aqueous one-component basecoat material of the invention, the wetting dispersant is an aqueous solution of a copolymer containing high pigment affinity groups.
As a preferred embodiment of the waterborne one-component basecoat of the present invention, the wetting and dispersing agent comprises at least one of EFKA4575, BYK190, tego 755W, tego 750W, or Tego 752W.
As a preferred embodiment of the water-borne one-component basecoat according to the present invention, the wetting agent is a silicone or siloxane-based surfactant.
As a preferred embodiment of the waterborne one-component basecoat of the present invention, the wetting agent comprises at least one of BYK346, BYK 333, tego Wet 270, tego KL 245, tego Twin 4000, tego Twin 4100, or Tego 4200.
As a preferred embodiment of the water-based single component basecoat of the present invention, the water-based zinc stearate emulsion is NMFH-T40.
In addition, the invention also provides a preparation method of the water-based single-component primer surfacer, which comprises the following steps:
(1) Adding an emulsifier and a part of initiator into deionized water, dissolving, heating to 80 +/-2 ℃, dropwise adding a part of core monomer mixture, keeping the temperature after dropwise adding, heating to 85 +/-2 ℃, dropwise adding the rest of initiator, the rest of core monomer mixture and shell layer monomer mixture, heating to 90 ℃ after dropwise adding, reacting, cooling to 50 +/-2 ℃, adding a pH regulator to regulate the pH value to 7-9, and filtering to obtain the acrylic emulsion with the core-shell structure;
(2) Uniformly dispersing and grinding part of the acrylic emulsion with the core-shell structure in the step (1), deionized water, a wetting dispersant, a wetting agent, a filler, carbon black and fumed silica to obtain slurry;
(3) And (3) adding the rest part of the acrylic emulsion with the core-shell structure in the step (1), the water-based zinc stearate emulsion, the mixed solution of deionized water and butanediol and the rheological aid into the slurry in the step (2), uniformly dispersing, and filtering to obtain the water-based single-component primer surfacer.
As a preferred embodiment of the preparation process of the present invention, in the step (1), the mass of the portion of the initiator is one third of the total mass of the initiator to be added.
In a preferred embodiment of the preparation method of the present invention, in the step (1), the dissolving temperature is 75 ± 2 ℃, and the dissolving environment is a nitrogen gas environment.
As a preferred embodiment of the production method of the present invention, in the step (1), the mass of the part of the nuclear monomer mixture is one fifth of the total mass of the nuclear monomer mixture to be added.
As a preferable embodiment of the preparation method of the present invention, in the step (1), the time for the heat preservation is 30. + -.5 min.
As a preferable embodiment of the preparation method of the present invention, in the step (1), the reaction time is 60. + -.5 min.
As a preferable embodiment of the preparation method of the present invention, in the step (1), the duration of the first dropping is 15. + -.1 min, and the duration of the second dropping is 4. + -. 0.1h.
In a preferred embodiment of the preparation method of the present invention, in the step (2), the mass of a part of the acrylic emulsion having a core-shell structure in the step (1) is one half of the total mass of the acrylic emulsion having a core-shell structure to be added.
As a preferred embodiment of the preparation method of the present invention, in the step (2), the uniform dispersion is performed in a manner of dispersing at a rotation speed of 800-1000r/min for 5-15min.
As a preferred embodiment of the preparation method of the present invention, in the step (2), the temperature of the milling is 45 ℃ or lower.
As a preferred embodiment of the preparation method of the present invention, in the step (2), the particle size of the slurry is less than or equal to 25 μm.
As a preferred embodiment of the preparation method of the present invention, in the step (3), the uniform dispersion is performed in a manner of dispersing at a rotation speed of 1000-1200r/min for 20-25min.
In addition, the invention also provides application of the waterborne one-component primer-surfacer in vehicle repair.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the method comprises the following steps: according to the water-based single-component primer surfacer provided by the technical scheme, the acrylic emulsion and the water-based zinc stearate emulsion with the core-shell structure in a proper ratio are selected as the addition components, and the acrylic emulsion and the water-based zinc stearate emulsion have a synergistic effect, so that the prepared water-based single-component primer surfacer has the advantages of high drying speed, good adhesive force, good polishing property and friendly upper paint surface;
secondly, the method comprises the following steps: the preparation method of the water-based single-component primer surfacer provided by the technical scheme of the invention is simple, convenient to operate and easy for industrial production.
Detailed Description
To better illustrate the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to specific examples, wherein the total weight parts of the examples and comparative examples are 100 parts.
Example 1
The embodiment provides a water-based single-component middle coating primer, which comprises the following components in percentage by weight: 35 parts of acrylic emulsion, 9.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 20 parts of rutile titanium dioxide, 15 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.3 part of cabot 570 low-pigment carbon black, 0.5 part of fumed silica, 5 parts of water-based zinc stearate emulsion, 3 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 7;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a nuclear monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell layer monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of xylene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the preparation method comprises the following steps:
(1) Adding 150mL of deionized water into a four-neck flask at 75 ℃ under the protection of nitrogen, weighing 1g of sodium dodecyl sulfate and 40g of a 1% potassium persulfate aqueous solution by mass fraction, adding the sodium dodecyl sulfate and the 40g of the 1% potassium persulfate aqueous solution into the deionized water, fully dissolving, heating to 80 ℃, dropwise adding 20g of a nuclear monomer mixture, keeping the temperature for 30min after 15min of dropwise addition, heating to 85 ℃, dropwise adding the remaining 80g of the 1% potassium persulfate aqueous solution by mass fraction, the remaining 80g of the nuclear monomer mixture and 110g of a shell layer monomer mixture, heating to 90 ℃ after 4h of dropwise addition, reacting for 1h, finally cooling to 50 ℃, adding triethylamine to adjust the pH value to 7-9, and filtering to obtain an acrylic emulsion with a core-shell structure;
(2) Weighing 17.5g of the acrylic emulsion with the core-shell structure prepared in the step (1), 9.6g of deionized water, 3g of BYK190, 0.2g of BYK346, 20g of rutile titanium dioxide, 15g of 1250-mesh talcum powder, 8g of kaolin, 0.3g of carbopt 570 low-pigment carbon black and 0.5g of fumed silica, sequentially and slowly adding into a dispersion machine, dispersing at a high speed of 800-1000r/min for 5-15min until the dispersion is uniform, and then grinding by using a horizontal sand mill until the granularity is less than or equal to 25 mu m to obtain slurry; in the grinding process, the grinding temperature is controlled to be lower than 45 ℃;
(3) Weighing 17.5g of acrylic emulsion with a core-shell structure prepared in the step (1), 5g of water-based zinc stearate emulsion and 3g of mixed solution of deionized water and butanediol, sequentially adding the acrylic emulsion, the water-based zinc stearate emulsion and the mixed solution of deionized water and butanediol into the slurry in the step (2), uniformly dispersing at the rotating speed of 800-1000r/min, adding 0.4g of Borchi Gel0620 polyurethane thickener, dispersing at the rotating speed of 1000-1200r/min for 20-25min at a high speed, and finally filtering to obtain the water-based single-component floating coat primer.
Example 2
The embodiment provides a water-based single-component middle coating primer, which comprises the following components in percentage by weight: 45 parts of acrylic emulsion, 7.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 15 parts of rutile titanium dioxide, 10 parts of 1250-mesh talcum powder, 6 parts of kaolin, 0.3 part of cabot 570 low-pigment carbon black, 0.5 part of fumed silica, 8 parts of water-based zinc stearate emulsion, 4 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 5.625;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a core monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of dimethylbenzene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the preparation method of this example is the same as example 1.
Example 3
The embodiment provides a water-based single-component middle coating primer, which comprises the following components in percentage by weight: 30 parts of acrylic emulsion, 14.1 parts of deionized water, 9 parts of Tego 755W wetting dispersant, 0.5 part of Tego Wet 270 wetting agent, 10 parts of rutile titanium dioxide, 10 parts of 1250-mesh talcum powder, 10 parts of kaolin, 0.5 part of cabot 570 low-pigment carbon black, 1.5 parts of fumed silica, 8 parts of water-based zinc stearate emulsion, 5 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 6;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a nuclear monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell layer monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of xylene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the preparation method of this example is the same as example 1.
Example 4
The embodiment provides a water-based single-component middle coating primer, which comprises the following components in percentage by weight: 33 parts of acrylic emulsion, 5 parts of deionized water, 5 parts of EFKA4575 wetting dispersant, 0.1 part of Tego Twin 4100 wetting agent, 25 parts of rutile titanium dioxide, 20 parts of 1250-mesh talcum powder, 5 parts of kaolin, 0.2 part of carbot 570 low-pigment carbon black, 0.5 part of fumed silica, 5 parts of water-based zinc stearate emulsion, 1 part of mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 6.6;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a core monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of dimethylbenzene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the preparation method of this example is the same as example 1.
Example 5
The embodiment provides a water-based single-component middle coating primer, which comprises the following components in percentage by weight: 40 parts of acrylic emulsion, 5 parts of deionized water, 2 parts of BYK190 wetting dispersant, 0.3 part of BYK346 wetting agent, 17 parts of rutile titanium dioxide, 15 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.2 part of carbott 570 low-pigment carbon black, 1.5 parts of fumed silica, 5 parts of water-based zinc stearate emulsion, 5 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 8;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a core monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of dimethylbenzene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the preparation method of this example is the same as example 1.
Example 6
The embodiment provides a water-based single-component middle coating primer, which comprises the following components in percentage by weight: 35 parts of acrylic emulsion, 9.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 20 parts of rutile titanium dioxide, 15 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.3 part of cabot 570 low-pigment carbon black, 0.5 part of fumed silica, 5 parts of water-based zinc stearate emulsion, 3 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 7;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a core monomer mixture (10 parts of acrylic acid, 45 parts of methyl methacrylate and 45 parts of butyl acrylate), 110 parts of a shell monomer mixture (40 parts of methyl methacrylate, 60 parts of butyl acrylate, 5 parts of dimethylbenzene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the preparation method of this example is the same as example 1.
Comparative example 1
The comparative example provides a waterborne single component basecoat comprising the following components in weight percent: 35 parts of acrylic emulsion, 6.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 20 parts of rutile titanium dioxide, 15 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.3 part of carbot 570 low-pigment carbon black, 0.5 part of fumed silica, 8 parts of water-based zinc stearate emulsion, 3 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 4.375;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a nuclear monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell layer monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of xylene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the comparative example was prepared in the same manner as in example 1.
Comparative example 2
The comparative example provides a waterborne single component basecoat comprising the following components in weight percent: 28 parts of acrylic emulsion, 14.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 20 parts of rutile titanium dioxide, 15 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.3 part of cabot 570 low-pigment carbon black, 0.5 part of fumed silica, 5 parts of water-based zinc stearate emulsion, 5 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 5.6;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a nuclear monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell layer monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of xylene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the comparative example was prepared in the same manner as in example 1.
Comparative example 3
The comparative example provides a waterborne single component basecoat comprising the following components in weight percent: 45 parts of acrylic emulsion, 5.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 15 parts of rutile titanium dioxide, 10 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.3 part of cabot 570 low-pigment carbon black, 0.5 part of fumed silica, 9 parts of water-based zinc stearate emulsion, 3 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 5;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a nuclear monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell layer monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of xylene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the comparative example was prepared in the same manner as in example 1.
Comparative example 4
The comparative example provides a waterborne single component basecoat comprising the following components in weight percent: 35 parts of acrylic emulsion, 9.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 20 parts of rutile titanium dioxide, 15 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.3 part of carbot 570 low-pigment carbon black, 0.5 part of fumed silica, 5 parts of water-based zinc stearate emulsion, 3 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 7;
wherein, the acrylic emulsion is a common acrylic emulsion with a non-core-shell structure sold in the market;
the comparative example was prepared in the same manner as in example 1.
Comparative example 5
The comparative example provides a water-based single-component basecoat comprising the following components in weight percent: 35 parts of acrylic emulsion, 9.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 20 parts of rutile titanium dioxide, 15 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.3 part of cabot 570 low-pigment carbon black, 0.5 part of fumed silica, 5 parts of water-based zinc stearate emulsion, 3 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 7;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 80 parts of a core monomer mixture (45 parts of styrene and 35 parts of butyl acrylate), 120 parts of a shell monomer mixture (30 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of dimethylbenzene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the comparative example was prepared in the same manner as in example 1.
Comparative example 6
The comparative example provides a waterborne single component basecoat comprising the following components in weight percent: 35 parts of acrylic emulsion, 9.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 20 parts of rutile titanium dioxide, 15 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.3 part of cabot 570 low-pigment carbon black, 0.5 part of fumed silica, 5 parts of zinc stearate, 3 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1);
wherein the mass ratio of the acrylic emulsion to the zinc stearate is 7;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a nuclear monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell layer monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of xylene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the comparative example was prepared in the same manner as in example 1.
Comparative example 7
The comparative example provides a waterborne single component basecoat comprising the following components in weight percent: 35 parts of acrylic emulsion, 9.6 parts of deionized water, 3 parts of BYK190 wetting dispersant, 0.2 part of BYK346 wetting agent, 20 parts of rutile titanium dioxide, 15 parts of 1250-mesh talcum powder, 8 parts of kaolin, 0.3 part of carbot 570 low-pigment carbon black, 0.5 part of fumed silica, 5 parts of water-based zinc stearate emulsion, 3 parts of a mixed solution of deionized water and butanediol (the mass ratio of the deionized water to the butanediol is 1;
wherein the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 7;
wherein, the acrylic emulsion comprises the following components in percentage by weight: 100 parts of a core monomer mixture (45 parts of styrene, 10 parts of methacrylic acid and 45 parts of butyl acrylate), 110 parts of a shell monomer mixture (20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of dimethylbenzene and 5 parts of butyl acetate), 1 part of an emulsifier and 120 parts of an initiator;
the comparative example was prepared in the same manner as in example 1.
Comparative example 8
The only difference between this comparative example and example 1 is that in step (2) of the preparation process, a slurry was obtained by grinding to a particle size of 50 to 100 μm using a horizontal sand mill.
Examples of effects
The acrylic emulsions prepared in example 1, example 6 and comparative example 5 were subjected to a performance test in which the state was observed by naked eyes, the solid content was measured according to the test method of GB/T1725-2007, the viscosity was measured according to the test method of GB/T12008.8-1992, the pH value was measured according to the test method of GB/T8325-1987, the density was measured according to the test method of GB/T6750-2007, the storage stability was measured by baking the prepared product in a constant temperature oven at 50 ℃ for 7 days, and the performance indexes of the test were as shown in Table 1,
table 1: performance indexes of acrylic emulsions prepared in example 1, example 6 and comparative example 5
| Example 1 | Example 6 | Comparative example 5 | |
| Status of state | Milky white color | Milky white color | Milky white color |
| Solid content (% wt) | 40±2 | 40±2 | 40±2 |
| Viscosity (mPas; 23 ℃ C.) | 100 | 100 | 80 |
| pH value | 8.2 | 8.2 | 8.2 |
| Density (g/mL; 23 ℃ C.) | 1.01～1.06 | 1.01～1.06 | 1.08～1.14 |
| Stability of | Stabilization of | Stabilization of | Slight delamination |
As can be seen from Table 1, the acrylic emulsions prepared in examples 1 and 6 have moderate solid contents, moderate viscosities and pH values, and good storage stability, while the acrylic emulsions prepared in comparative example 5 have slight differences in viscosity, density, and storage stability from the acrylic emulsions in examples 1 and 6, indicating that they need to be prepared in the preferred ranges given in the present invention in the self-made acrylic emulsions, otherwise the quality of the acrylic emulsions is reduced, thereby affecting the properties of the intercoat primers prepared subsequently.
The waterborne one-component basecoat prepared in examples 1 to 6 and comparative examples 1 to 8 were tested for their flexibility according to the test method of GB/T1731 to 1993, for their tack-free time and tack-free time according to the test method of GB/T1728-1986, for their cross-hatch adhesion according to the test method of GB/T9286-1998, for their Volatile Organic Compounds (VOC) according to the test method of GB24409-2020, for their storage stability by baking the prepared products in a constant temperature oven at 50 ℃ for 7 days, the results of which are shown in Table 2,
table 2: performance index of the waterborne one-component basecoat prepared in examples 1-6 and comparative examples 1-6
As can be seen from the table 2, the water-based single-component primer surfacers prepared in the embodiments 1 to 6 are quick-drying at normal temperature, have surface drying time within 12min, have actual drying time within 21min at 60 ℃, are easy to polish, uniform and fine, basically have no sand holes, have 1-grade cross-cut adhesive force, good storage stability and low VOC content which is below 108g/L, wherein the VOC in the embodiment 4 can reach below 77g/L, so that the requirements of quick repair of automobiles can be met, the quality after repair can be ensured, and the environment can not be damaged due to the overhigh VOC content;
it can be seen from the data of example 1 and comparative example 1 that when the mass ratio of the acrylic emulsion to the aqueous zinc stearate emulsion is not within the range given by the present invention, the adhesion of the prepared product is reduced, and the stability of the product is reduced, under the condition of the stability research of the present invention, the delamination phenomenon occurs, which affects the subsequent use; it can be seen from the data of example 1 and comparative example 2 that when the amount of the acrylic emulsion added is not within the range given in the present invention, the amount of the acrylic emulsion added is relatively low, the color ratio is not appropriate, the storage stability is deteriorated, delamination occurs, and there is a slight thickening phenomenon, and since the amount of the acrylic emulsion added is relatively small, the open time and the tack time of the prepared product are both increased accordingly, which is not favorable for rapid repair; it can be seen from the data of example 1 and comparative example 3 that when the addition amount of the aqueous zinc stearate emulsion is too high, on one hand, the cross-cut adhesion of the product is reduced, on the other hand, the stability of the product is affected, and the slight delamination phenomenon occurs, on the other hand, the addition amount of the aqueous zinc stearate emulsion is too large, and the VOC of the product is also significantly increased; as can be seen from the data of example 1 and comparative example 4, when the conventional acrylic emulsion was used instead of the self-made acrylic emulsion having a core-shell structure; the surface drying time and the actual drying time of the prepared product are obviously increased, wherein the surface drying time in a comparative example 4 is 2 times of the surface drying time in an example 1, and meanwhile, the adhesive force and the stability of the product are slightly reduced by adopting the common acrylic emulsion; it can be seen from the data of example 1 and comparative example 5 that, when the method for preparing the acrylic emulsion having the core-shell structure of the present invention is used, but the mass ratio of the core layer to the shell layer is not within the range given by the present invention, the mass of the core layer in the acrylic emulsion having the core-shell structure prepared in comparative example 5 is reduced, on one hand, the glass transition temperature of the synthetic resin is reduced, which is not favorable for drying, and on the other hand, the mass difference of the core-shell layer is too large, which is not favorable for stabilization, which results in the reduction of the stability of the prepared product; it can be seen from the data of example 1 and comparative example 6 that when zinc stearate is used instead of the aqueous zinc stearate emulsion, the film tends to be coarse during the preparation process and during storage; and has no synergistic effect with acrylic emulsion, so that the surface drying time and the actual drying time are obviously increased, and the adhesive force is deteriorated; as can be seen from the data of example 1 and comparative example 7, when the content of butanediol in the mixture of deionized water and butanediol is very small, on one hand, the storage stability, especially the freeze-thaw stability, is poor, the phenomenon of coarsening easily occurs during storage, and a paint film is not uniform, fine and slightly rough after being dried, and on the other hand, the surface drying time and the actual drying time of the product are increased; it can be seen from the data of example 1 and comparative example 8 that when the particle size of the slurry obtained in the preparation process is too large, the storage stability of the prepared product is reduced, the prepared product is prone to layering and has particulate matter during standing, and more sand holes are formed in the grinding process, so that the paint film formed by the prepared product is rough.
Finally, it should be noted that the above embodiments are intended to illustrate the technical solutions of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (2)
1. The water-based single-component primer surfacer is characterized by comprising the following components in parts by weight: 33 parts of acrylic emulsion, 5 parts of deionized water, 5 parts of EFKA4575 wetting dispersant, 0.1 part of Tego Twin 4100 wetting agent, 25 parts of rutile titanium dioxide, 20 parts of 1250-mesh talcum powder, 5 parts of kaolin, 0.2 part of carbot 570 low-pigment carbon black, 0.5 part of fumed silica, 5 parts of water-based zinc stearate emulsion, 1 part of mixed solution of deionized water and butanediol and 0.2 part of Borchi Gel0620 polyurethane thickener; the mass ratio of the acrylic emulsion to the water-based zinc stearate emulsion is 6.6:1;
the acrylic emulsion is of a core-shell structure;
the acrylic emulsion comprises 100 parts of a core monomer mixture, 110 parts of a shell layer monomer mixture, 1 part of an emulsifier and 120 parts of an initiator; the nuclear monomer mixture consists of 45 parts of styrene, 10 parts of (methyl) acrylic acid and 45 parts of butyl acrylate; the shell layer monomer mixture consists of 20 parts of methyl methacrylate, 80 parts of butyl acrylate, 5 parts of xylene and 5 parts of butyl acetate; the mass ratio of the core monomer mixture to the shell monomer mixture is 0.909:1;
the mass ratio of the deionized water to the butanediol in the mixed solution of the deionized water and the butanediol is 1;
the preparation method of the water-based single-component primer surfacer comprises the following steps:
(1) Adding an emulsifier and a part of initiator into deionized water, dissolving, heating to 80 +/-2 ℃, dropwise adding a part of core monomer mixture, keeping the temperature after dropwise adding, heating to 85 +/-2 ℃, dropwise adding the rest of initiator, the rest of core monomer mixture and shell layer monomer mixture, heating to 90 ℃ after dropwise adding, reacting, cooling to 50 +/-2 ℃, adding a pH regulator to regulate the pH value to 7-9, and filtering to obtain the acrylic emulsion with the core-shell structure;
(2) Uniformly dispersing and grinding part of the acrylic emulsion with the core-shell structure in the step (1), deionized water, an EFKA4575 wetting dispersant, a Tego Twin 4100 wetting agent, rutile titanium dioxide, 1250-mesh talcum powder, kaolin, carbopt 570 low-pigment carbon black and fumed silica to obtain slurry with the particle size of less than or equal to 25 mu m;
(3) And (3) adding the rest part of the acrylic emulsion with the core-shell structure in the step (1), the water-based zinc stearate emulsion, the mixed solution of deionized water and butanediol and the rheological aid into the slurry in the step (2), uniformly dispersing, and filtering to obtain the water-based single-component primer surfacer.
2. Use of the water-borne one-component basecoat of claim 1 in vehicle refinish.
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