CN114163880B - Composite water-based high-temperature amino baking paint and preparation method thereof - Google Patents
Composite water-based high-temperature amino baking paint and preparation method thereof Download PDFInfo
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- CN114163880B CN114163880B CN202111428026.2A CN202111428026A CN114163880B CN 114163880 B CN114163880 B CN 114163880B CN 202111428026 A CN202111428026 A CN 202111428026A CN 114163880 B CN114163880 B CN 114163880B
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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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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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
- C09D7/20—Diluents or solvents
Abstract
The invention belongs to the field of coatings, and particularly relates to a composite water-based high-temperature amino baking paint and a preparation method thereof. The composite water-based high-temperature amino baking varnish comprises a main agent and a diluent, wherein the main agent comprises the following components in parts by weight: the coating comprises a water-based hydroxyl acrylic acid secondary dispersion, a water-soluble acrylic resin, a water-soluble amino resin, a water-soluble blocked isocyanate, an ammonia neutralizing agent, deionized water, a dispersing agent, a water-based nano carbon black color paste, talcum powder, a cosolvent DB diethylene glycol butyl ether, a base material wetting agent, a defoaming agent, a leveling agent and a thickening agent; the diluent consists of the following components in parts by weight: 100 parts of deionized water. Compared with the traditional water-soluble acrylic amino baking varnish, the composite amino baking varnish has well balanced hardness and flexibility, and simultaneously has few alcohol ether solvents and extremely low VOC in main resin, thereby better meeting the increasingly strict environmental protection requirement.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to a composite water-based high-temperature amino baking varnish and a preparation method thereof.
Background
As an environment-friendly water-based coating, the water-based amino baking paint has the advantages of good decorative effect, high hardness, easy cleaning in paint preparation and construction processes, low VOC emission and the like, and is widely applied.
The water-based amino baking varnish mainly comprises water-based resin, water, a water-based auxiliary agent and a cosolvent. Along with the health of environmental regulations and the enhancement of environmental awareness of people, the emission of Volatile Organic Compounds (VOC) in the traditional solvent-based high-temperature amino baking varnish is more and more strictly limited. The development of low-pollution, high-performance and multifunctional environment-friendly water-based paint becomes the main direction of paint technology development. The waterborne high-temperature amino baking paint combines the high performance of the solvent-based high-temperature amino baking paint with the low VOC emission of the waterborne coating, and becomes a hotspot of the research of the coating industry.
Compared with solvent-based high-temperature amino baking paint, the defects in the aspects of mechanical property and chemical resistance exist in the prior water-based high-temperature baking paint, how to provide better mechanical property and more excellent chemical resistance and other physicochemical properties so as to meet the requirements of daily industrial production and environmental protection, and the technical problem to be solved is urgent.
Disclosure of Invention
The invention aims to overcome the defects of the water-soluble amino baking paint in the aspects of mechanical property and chemical resistance, and provides the composite water-based amino baking paint which has higher crosslinking density, better water resistance, salt mist resistance and the like, and better workability so as to meet the requirements of environmental protection.
The purpose of the invention is realized by the following technical scheme:
a compound aqueous high-temperature amino baking varnish, which comprises a main agent and a diluent,
the main agent comprises the following preparation raw materials:
the diluent consists of the following components in parts by weight:
100 parts of deionized water.
Preferably, the main agent is prepared from the following preparation raw materials in parts by weight:
preferably, the main agent is prepared from the following preparation raw materials in parts by weight:
preferably, the aqueous acrylic dispersion is a secondary dispersion with a hydroxyl content of 4.0% and a solid content of 40%.
Preferably, the water-soluble acrylic resin is selected from water-soluble acrylic resins with an acid value of 60mgKOH/g and a solid content of 60%.
Preferably, the water-soluble amino resin is high imino methylated melamine resin with solid content of 80%.
Preferably, the water-soluble blocked isocyanate is blocked isocyanate prepared by using tertiary alcohol as a blocking agent, the NCO content is 9%, and the unblocking temperature is 110 ℃. .
Preferably, the ammonia neutralizer is DMEA, has a lone pair of electrons on N, is a Lewis base and is easy to combine with H in water + Make OH - And the melamine resin reacts with carboxyl in acrylic acid to form amine salt, which plays a role of a latent catalyst and releases carboxyl to catalyze ether exchange reaction of melamine resin and hydroxyl and other groups after being volatilized at high temperature.
The invention also provides a preparation method of the composite water-based high-temperature amino baking varnish, and the preparation method of the main agent comprises the following steps:
1) Neutralizing acrylic resins
a, preparing raw materials according to a formula;
b, adding the water-soluble acrylic resin and the water-based acrylic acid dispersoid in the formula amount into a dispersion container, slowly adding the neutralizer N, N-dimethylethanolamine in the formula amount under stirring, and stirring and dispersing to be in a uniform state;
c, measuring the pH value by using a pH meter, and adjusting the using amount of a neutralizing agent until the pH value is adjusted to be between 8.5 and 9.5;
2) Mixing stage
a, slowly adding the acrylic resin neutralized in the step 1) under stirring
b, slowly adding water-soluble amino resin under stirring;
c, slowly adding water-soluble blocked isocyanate under stirring;
d, slowly adding deionized water, a dispersing agent and water-based nano carbon black slurry according to the formula amount under stirring;
e, slowly adding the talcum powder with the formula amount under stirring;
f, slowly adding the defoaming agent, the flatting agent, the base material wetting agent and the cosolvent in the formula amount under stirring;
g, slowly adding a thickening agent with a formula amount under stirring, adjusting the viscosity to 70-80 Ku, and filtering with a 200-mesh filter screen to obtain the main agent component of the composite water-based high-temperature amino baking varnish;
preferably, in the step e of the mixing stage, the main agent is prepared by adding the talcum powder with the formula amount and then stirring for 10-20min at the dispersion speed of 1200-1800 r/min; and step g, dispersing at a dispersion speed of 400-800 r/min.
The following is a detailed description of the effects of the components in the formula:
aqueous hydroxyacrylic acid secondary dispersion: the primary film formers in the coating system provide hydroxyl, carboxyl groups reactive with melamine formaldehyde resins, hydroxyl, carboxyl groups reactive with NCO groups, and the like;
water-soluble acrylic resin: the main film former in the coating system provides carboxyl groups which react with melamine formaldehyde resin and NCO groups, and acts as a catalyst to catalyze the ether exchange reaction of amino resin;
ammonia neutralizer: n, N-dimethylethanolamine is selected as a neutralizer, N has lone pair electrons, is Lewis base and is easy to combine with H in water + Make OH - The melamine resin is added and reacts with carboxyl in acrylic acid to form amine salt, which plays a role of a latent catalyst and releases carboxyl to catalyze ether exchange reaction of melamine resin and hydroxyl and other groups after being volatilized at high temperature;
water-soluble amino resin: the main cross-linking agent in the coating system is high imino methylated trimethoxy methyl melamine resin with solid content of 80 percent, and mainly participates in the reaction with hydroxyl, carboxyl and amino in the system to form a cross-linking structure;
water-soluble blocked isocyanate: the important cross-linking agent in the coating system is deblocked at high temperature to release NCO groups to react with hydroxyl groups, carboxyl groups and amino groups in the polymer and residual water in a coating film;
dispersing agent: stabilizing the dispersion of the pigment and filler, modifying the surface activity of the pigment and filler, adjusting the intermolecular motion of pigment and filler particles, adding a proper amount of dispersant, shortening the dispersion time, increasing the tinting strength and hiding power, improving the color development and toning performance of the pigment, preventing flooding and floating, preventing flocculation and sedimentation and the like;
water-based nano carbon black slurry: the carbon black powder is used as an inorganic pigment, has good covering power, and the nanoscale water-based carbon black color paste has small particle size and narrow particle size distribution, is easier to be wrapped by resin and provides good color development and covering power;
talc powder: the talcum powder is used as extender pigment, plays a role in filling in a paint film, and is matched with a film forming matter to provide shielding force, extinction and smooth hand feeling;
cosolvent: the cosolvent reduces the viscosity of the whole paint system, provides wettability to pigments and fillers, improves the dispersion effect, is an excellent film-forming aid, reduces MFFT and ensures that the film-forming property of a paint film is better;
substrate wetting agent: the surface tension of the water-based paint is reduced, the sensitivity of the paint to substrate pollutants is reduced, the paint can be better spread on the substrate, and the probability of paint film defects such as shrinkage cavities, pinholes and the like of the paint film is reduced;
defoaming agent: preventing bubbles caused by high-speed dispersion in the dispersion process and bubbles in the packaging and spraying processes;
leveling agent: the surface tension of the coating can be effectively reduced, the leveling property and uniformity are improved, and the coating is promoted to form a flat, smooth and uniform coating film in the drying and film-forming process;
thickening agent: the thickening agent is a rheological additive, and can improve the viscosity of the coating under the action of proper shearing force and prevent the phenomenon of sagging in the construction process.
The core of the invention is that the water-based acrylic acid dispersoid with high hydroxyl content and the water-soluble acrylic resin with high acid value are selected to provide excessive-OH and-COOH to improve the water resistance and the salt spray resistance, and simultaneously, a certain amount of urethane bonds are generated by the cross-linking reaction of-NCO in the hydroxyl acrylic acid dispersoid after being deblocked at high temperature and the-OH in the hydroxyl acrylic acid dispersoid to provide the cross-linking density and improve the flexibility. With the increase of the crosslinking density, the mechanical properties and chemical resistance of the product, such as water resistance, salt spray resistance, high temperature and high humidity resistance, hardness, flexibility and the like, can be greatly improved.
Compared with the prior art, the invention has the beneficial effects that:
the invention selects the water-based acrylic acid dispersoid with high hydroxyl content and the water-soluble acrylic resin with high carboxyl content to fundamentally obtain high crosslinking strength with amino resin, thereby having strong mechanical property, the excessive-OH and-COOH can be further crosslinked through the unsealed-NCO, the residual-COOH has partial reaction with-OH, the reaction greatly eliminates the hydrophilicity of a coating system and improves the water resistance of a coating film.
Compared with the traditional aqueous acrylic acid dispersion amino baking paint, the composite amino baking paint has more carboxyl groups participating in the crosslinking reaction, higher crosslinking density to a certain extent, enhanced mechanical property and better water resistance of a coating film.
Compared with the traditional water-soluble acrylic amino baking varnish, the composite amino baking varnish has more hydroxyl groups participating in a crosslinking reaction, more carbamate chain segments are generated in a film forming material, the hardness and the flexibility are well balanced, and meanwhile, the alcohol ether solvent in the main resin is very little, the VOC is very low, and the baking varnish more conforms to the increasingly strict environmental protection requirement.
Detailed Description
The present invention is described in detail below with reference to specific examples, but the present invention is not limited thereto in any way.
In the following examples, a secondary dispersion having a hydroxyl content of 4.0% and a solid content of 40% was selected as the aqueous acrylic dispersion, a water-soluble acrylic resin having an acid value of 60mgKOH/g and a solid content of 60% was selected as the water-soluble acrylic resin, a novel 325 amino resin was selected as the water-soluble amino resin, a blocked isocyanate prepared by using a tertiary alcohol as a blocking agent was selected as the water-soluble blocked isocyanate, an NCO content of 9%, a deblocking temperature of 110 ℃, DMEA selected as the ammonia neutralizing agent, a german Mingmen 490 selected as the dispersing agent, a dikao-270 selected as the substrate wetting agent, a german Byk-024 selected as the antifoaming agent, a Borchi-1375 selected as the leveling agent, and a Borchi-0435 selected as the thickening agent.
Example 1
A composite water-based high-temperature amino baking varnish, which comprises a main agent and a diluent,
the main agent consists of the following components in parts by weight:
the diluent consists of the following components in parts by weight:
100 parts of deionized water.
Comparative example 1
An aqueous acrylic acid dispersion high-temperature amino baking paint comprises a main agent and a diluent,
the main agent consists of the following components in parts by weight:
the diluent consists of the following components in parts by weight:
100 parts of deionized water.
Comparative example 2
A water-soluble acrylic acid high-temperature amino baking varnish, which comprises a main agent and a diluent,
the main agent consists of the following components in parts by weight:
the diluent consists of the following components in parts by weight:
100 parts of deionized water.
The aqueous high-temperature amino baking varnish of the 3 above examples was prepared by the following preparation method:
the preparation method of the main agent comprises the following steps:
1) Neutralizing acrylic resins
a, preparing raw materials according to a formula;
b, adding the water-soluble acrylic resin and the water-based acrylic dispersoid in the formula amount into a dispersion container, slowly adding the neutralizer N, N-dimethylethanolamine in the formula amount under stirring, and stirring and dispersing to be in a uniform state;
c, measuring the pH value by using a pH meter, and adjusting the using amount of a neutralizing agent until the pH value is adjusted to be between 8.5 and 9.5;
2) Mixing stage
a, slowly adding the acrylic resin neutralized in the step 1) under stirring
b, slowly adding water-soluble amino resin while stirring;
c, slowly adding water-soluble blocked isocyanate under stirring;
d, slowly adding deionized water, a dispersing agent and water-based nano carbon black slurry according to the formula amount under stirring;
e, slowly adding the talcum powder with the formula amount under stirring;
f, slowly adding the defoaming agent, the flatting agent, the base material wetting agent and the cosolvent DB in the formula amount under stirring;
g, slowly adding a thickening agent with a formula amount under stirring, adjusting the viscosity to 70-80 Ku, and filtering with a 200-mesh filter screen to obtain the main agent component of the aqueous high-temperature amino baking varnish;
the preparation of the main agent is carried out in the step e of the mixing stage, the talcum powder with the formula amount is added and then stirred for 10-20min at the dispersion speed of 1200-1800 r/min; and step g, dispersing at a dispersion speed of 400-800 r/min.
The aqueous high-temperature amino baking varnish obtained in the above 3 examples was compared in terms of water resistance, mechanical properties and chemical resistance, and the results were as follows:
table 1: results of various tests on the products of examples and comparative examples
As can be seen from table 1, compared with the water-soluble acrylic amino baking paint and the water-based acrylic dispersion amino baking paint, the composite water-based high-temperature amino baking paint combines the advantages of the water-soluble acrylic amino baking paint and the water-based acrylic dispersion amino baking paint on the premise of not influencing the original physical properties, and has significantly improved physical and chemical properties such as hardness, flexibility, alcohol resistance, boiling resistance, salt mist resistance, high temperature and high humidity resistance.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make modifications and alterations without departing from the scope of the present invention.
Claims (4)
1. The composite water-based high-temperature amino baking varnish is characterized by comprising a main agent and a diluent, wherein the main agent is prepared from the following raw materials in parts by weight:
30-40 parts of an aqueous acrylic dispersion;
10-20 parts of water-soluble acrylic resin;
2-3 parts of ammonia neutralizing agent;
5-10 parts of water-soluble amino resin;
1 to 2 parts of water-soluble closed isocyanate;
15-20 parts of deionized water;
1 to 2 parts of a dispersing agent;
3 to 5 parts of aqueous nano carbon black slurry;
5 to 10 parts of talcum powder;
4 to 6 parts of a cosolvent DB;
0.3 to 0.5 part of base material wetting agent;
0.1 to 0.2 part of defoaming agent;
0.3 to 0.5 part of leveling agent;
0.5 to 1 part of thickening agent;
the diluent consists of the following components in parts by weight: 100 parts of deionized water;
the aqueous acrylic acid dispersoid is a secondary dispersoid with the hydroxyl content of 4.0 percent and the solid content of 40 percent;
the water-soluble acrylic resin is selected from water-soluble acrylic resin with an acid value of 60mgKOH/g and a solid content of 60 percent;
the water-soluble amino resin is high imino methylated melamine resin, and the solid content is 80%;
the water-soluble blocked isocyanate is blocked isocyanate prepared by using tertiary alcohol as a blocking agent, wherein the NCO content is 9%, and the deblocking temperature is 110 ℃;
the ammonia neutralizer is DMEA.
2. The compound aqueous high-temperature amino baking varnish according to claim 1,
the main agent is prepared from the following preparation raw materials in parts by weight:
40 parts of an aqueous acrylic dispersion;
10 parts of water-soluble acrylic resin;
2.5 parts of ammonia neutralizer;
9 parts of water-soluble amino resin;
1.5 parts of water-soluble blocked isocyanate;
16.3 parts of deionized water;
1 part of a dispersant;
5 parts of water-based nano carbon black slurry;
8 parts of talcum powder;
5 parts of a cosolvent DB;
0.5 part of base material wetting agent;
0.2 part of defoaming agent;
0.5 part of a leveling agent;
0.5 part of thickening agent.
3. The preparation method of the compound type aqueous high-temperature amino baking varnish as claimed in claim 1 or 2, wherein the preparation of the main agent comprises the following steps:
1) Neutralizing acrylic resins
a, preparing raw materials according to a formula;
b, adding the water-soluble acrylic resin and the water-based acrylic dispersoid in the formula amount into a dispersion container, slowly adding the neutralizer N, N-dimethylethanolamine in the formula amount under stirring, and stirring and dispersing to be in a uniform state;
c, measuring the pH value by using a pH meter, and adjusting the dosage of the neutralizing agent until the pH value is adjusted to be between 8.5 and 9.5;
2) Mixing stage
a, slowly adding the acrylic resin neutralized in the step 1) under stirring;
b, slowly adding water-soluble amino resin while stirring;
c, slowly adding water-soluble blocked isocyanate under stirring;
d, slowly adding deionized water, a dispersing agent and water-based nano carbon black slurry according to the formula amount under stirring;
e, slowly adding the talcum powder with the formula amount under stirring;
f, slowly adding the defoaming agent, the flatting agent, the base material wetting agent and the cosolvent in the formula amount under stirring;
g, slowly adding the thickener according to the formula amount under stirring, adjusting the viscosity to 70 to 80KU, and filtering by using a 200-mesh filter screen to obtain the main agent component of the composite water-based high-temperature amino baking paint.
4. The preparation method of the compound aqueous high-temperature amino baking varnish as claimed in claim 3, wherein the main agent is prepared in the step e of the mixing stage, and after the addition of the formula amount of talcum powder, the mixture is stirred for 10-20min at the dispersion speed of 1200-1800 r/min; and step g, dispersing at a dispersion speed of 400-800 r/min.
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| CN115074019B (en) * | 2022-05-10 | 2023-04-11 | 珠海市美筑新材料有限公司 | Ceramic-imitated transmutation glaze layer and preparation method and application thereof |
| CN114836096A (en) * | 2022-05-26 | 2022-08-02 | 湖南湘江关西涂料有限公司 | Water-based acrylic resin coating, composite paint structure and coating and color registering method |
| CN114854254B (en) * | 2022-06-15 | 2023-04-25 | 福建合润包装涂料有限公司 | Water-based finishing paint for three-piece food cans and preparation method thereof |
| CN114989682A (en) * | 2022-06-29 | 2022-09-02 | 广东衡光新材料科技有限公司 | Dip-coating paint for water-based tape measure and preparation method thereof |
| CN115678403A (en) * | 2022-11-02 | 2023-02-03 | 佛山阳光逸采涂料科技有限公司 | Water-based electronic component insulating coating and preparation method thereof |
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