Waterproof weather-resistant double-component exterior wall emulsion paint
Technical Field
The invention belongs to the technical field of building coatings, and relates to a waterproof weather-resistant bi-component exterior wall latex paint and a preparation method thereof.
Background
The exterior wall paint is also called exterior wall paint, is generally used for exterior walls, and can also be used in places with high humidity, such as toilets. The exterior wall coatings are various and can be classified into strong acid-base resistant exterior wall coatings, pure acrylic acid elastic exterior wall coatings, organic silicon self-cleaning elastic exterior wall coatings, high-grade acrylic acid exterior wall coatings, oily fluorocarbon coatings and the like. The pure acrylic acid elastic exterior wall coating and the high-grade acrylic acid exterior wall coating have the defects of water resistance, easy aging and color change of a paint film, the organic silicon self-cleaning elastic exterior wall coating has the defect of low hardness, and the oily fluorocarbon coating has the defects of poor environmental protection performance and high VOC (volatile organic compound) emission although the oily fluorocarbon coating has excellent performance.
CN201310620991.9 discloses a weather-resistant mildew-proof moisture-proof exterior wall paint which is composed of the following components in parts by weight: 20-30 parts of ethanolamine, 5-10 parts of XG-95, 250 parts of 200-ion nano kaolin, 300 parts of 250-ion lithopone, 10-20 parts of starch, 600 parts of 500-ion vinyl acetate homopolymer emulsion, 50-80 parts of propylene glycol, 30-50 parts of isopropanol, 300 parts of 250-ion sericite, 200 parts of 150-ion GR composite titanium white pigment, 20-30 parts of auxiliary agent and 300 parts of 250-ion purified water. The weather-resistant mildew-proof moisture-proof exterior wall paint can resist ultraviolet rays in the environment, solves the problems of color fading and light loss of the paint, prolongs the service life of the paint, and has good stain resistance, rubbing resistance, powder resistance, weather resistance, mildew resistance and moisture resistance. However, the invention adopts the vinyl acetate homopolymer emulsion as the film forming substance, and has slightly poor hydrophobic property and acid and alkali resistance.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention aims to provide a waterproof and weather-resistant double-component exterior wall latex paint.
The invention adopts the following technical scheme that the waterproof weather-resistant bi-component exterior wall latex paint is characterized by consisting of A, B two components, wherein the component A comprises the following components in parts by weight: 35-40 parts of aqueous fluorocarbon resin dispersoid, 1-5 parts of film-forming additive, 0.3-1.0 part of flatting agent, 0.1-0.3 part of thickening agent, 0.5-1 part of wetting dispersant, 0.25-0.30 part of defoaming agent, 0.20-0.25 part of bactericide, 25-40 parts of pigment and filler and 15-20 parts of water; the component B is as follows: 2-5 parts of titanate coupling agent and 1-3 parts of perhydropolysilazane.
The film-forming additive is at least one of 2,2, 4-trimethyl-1, 3-pentanediol diisobutyrate, butanediol isooctyl ether, tetraethylene glycol and dihydroxy n-butyl ether.
The leveling agent is at least one of BYK-381, BYK-333 and BYK-306.
The thickener is at least one of carboxymethyl cellulose, hydroxyethyl cellulose, polyether associative polyurethane rheological thickener and nonionic polyurethane associative thickener.
The wetting dispersant is at least one of TEGO760W, TEGO715W, TEGO750W, TEGO4100 and TEGO 685.
The defoaming agent is at least one of BYK-038, BYK-035 and BYK-037.
The bactericide is at least one of cason isothiazolinone, isothiazolinone and methylisothiazolinone.
The pigment and filler is at least one of talcum powder, silica powder, mica powder, zinc phosphate, zinc molybdate, iron oxide red, aluminum tripolyphosphate, barium metaborate, kaolin, bentonite, ferrotitanium powder, ferrophosphorus powder, graphite powder, borax, asbestos powder and water-based color paste.
The titanate coupling agent is at least one of isopropoxy tristearate titanate, di (dioctyl pyrophosphoryl oxy) titanium glycolate, tetraisopropyl di (dioctyl phosphite acyloxy) titanate, isopropyl tri (dioctyl pyrophosphate acyloxy) titanate and triethoxy epoxy isopropyl titanate.
The aqueous fluorocarbon resin dispersion is prepared by the following method in parts by weight:
(1) adding 30-50 parts of fluorine-containing soft monomer, 10-15 parts of fluorine-containing hard monomer, 10-15 parts of hydroxypropyl acrylate, 5-10 parts of 4,4, 4-trifluoro butenoic acid, 2-5 parts of initiator and 1-3 parts of mercaptoethanol into a mixing kettle, and uniformly mixing to obtain a dropping liquid for later use;
(2) adding 30-35 parts of amphoteric solvent into a reaction kettle under the condition of introducing nitrogen, heating to 110-125 ℃, slowly dropwise adding liquid into the reaction kettle, keeping the temperature for 2-3 hours after dropwise adding is finished for 4-5 hours; then adding 0.2-0.5 part of initiator at the temperature of 110-;
(3) cooling to 50-70 ℃, dropwise adding 10-15 parts of dimethylethanolamine into the mixture until the pH value of the system is 8, distilling under reduced pressure to remove the solvent and impurities until the mass fraction of the system is more than 85%, and then adding 60-90 parts of water into the mixture to stir at high speed for emulsification to obtain the aqueous fluorocarbon resin dispersoid.
The fluorine-containing soft monomer is at least one of heptafluoro-n-pentene, pentafluoro-n-butene and heptadecafluorooctyl acrylate; the hard monomer is at least one of acrylic acid perfluoro isobornyl ester, methacrylic acid perfluoro isobornyl ester and pentafluorostyrene; the initiator is at least one of tert-butyl peroxybenzoate, tert-butyl peroxyneodecanoate and cyclohexanone peroxide; the amphoteric solvent is at least one of ethylene glycol monobutyl ether, ethanol and propylene glycol monobutyl ether.
The preparation method is realized by uniformly mixing materials of A, B components according to a conventional method, and the invention is particularly suitable for cement walls and ceramic tile walls to be renovated.
The use method of the invention comprises the following steps: 1h before construction, A, B components are uniformly mixed and then are applied to the surfaces of cement walls and ceramic tile walls to be renovated by brush coating or spraying.
Compared with the prior art, the invention has the following advantages or beneficial results:
the invention selects aqueous two-component fluorocarbon resin as a film forming material, takes titanate coupling agent and perhydropolysilazane as curing agents, and forms a three-dimensional network structure through the reaction of hydroxyl of fluorocarbon resin dispersoid and the curing agents. The titanate coupling agent has excellent crosslinking performance, the perhydropolysilazane has the characteristic of high silicon nitride hardness after being cured, and the main resin fluorocarbon resin has the advantages of hydrophobicity, weather resistance, acid and alkali resistance and salt mist resistance. The latex paint has high hardness, good film-forming property and high toughness.
Detailed Description
The waterproof and weatherable two-component exterior wall latex paint of the present invention will be further described with reference to the following examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention.
Example 1
The aqueous fluorocarbon resin dispersion M is prepared by the following method in parts by weight:
(1) adding 34 parts of heptafluoro-n-pentene, 12 parts of acrylic acid perfluoro-isobornyl ester, 11 parts of hydroxypropyl acrylate, 7 parts of 4,4, 4-trifluorobutenoic acid, 3 parts of tert-butyl peroxyneodecanoate and 2 parts of mercaptoethanol into a mixing kettle, and uniformly mixing to obtain a dropping liquid for later use;
(2) adding 32 parts of propylene glycol monobutyl ether into a reaction kettle under the condition of introducing nitrogen, heating to 115 ℃, slowly dropwise adding a dropwise adding liquid into the reaction kettle, keeping the temperature and reacting for 2.5 hours after dropwise adding is finished for 4.5 hours; then 0.3 part of tert-butyl peroxyneodecanoate is added at 115 ℃, and the temperature is kept for 1 hour;
(3) and (3) cooling to 60 ℃, dropwise adding 12 parts of dimethylethanolamine into the mixture until the pH value of the system is 8, distilling under reduced pressure to remove the solvent and impurities until the mass fraction of the system is more than 85%, and then adding 80 parts of water into the mixture to stir and emulsify at high speed to obtain the aqueous fluorocarbon resin dispersoid M.
Example 2
The aqueous fluorocarbon resin dispersion N is prepared by the following method in parts by weight:
(1) adding 30 parts of pentafluoro n-butene, 10 parts of perfluoroisobornyl methacrylate, 10 parts of hydroxypropyl acrylate, 5 parts of 4,4, 4-trifluorobutenoic acid, 2 parts of tert-butyl peroxyneodecanoate and 1 mercaptoethanol into a mixing kettle, and uniformly mixing to obtain a dropping liquid for later use;
(2) adding 30 parts of ethanol into a reaction kettle under the condition of introducing nitrogen, heating to 110 ℃, slowly dropwise adding a dropwise adding liquid into the reaction kettle, keeping the temperature for 2 hours after dropwise adding is finished for 4 hours; then 0.2 part of tert-butyl peroxyneodecanoate is added at 110 ℃, and the temperature is kept for 1 hour;
and (3) cooling to 50 ℃, dropwise adding 10 parts of dimethylethanolamine into the mixture until the pH value of the system is 8, distilling under reduced pressure to remove the solvent and impurities until the mass fraction of the system is more than 85%, and then adding 60 parts of water into the mixture to stir and emulsify at high speed to obtain the aqueous fluorocarbon resin dispersoid N.
Example 3
The aqueous fluorocarbon resin dispersion X is prepared by the following method in parts by weight:
(1) adding 50 parts of heptadecafluorooctyl acrylate, 15 parts of pentafluorostyrene, 15 parts of hydroxypropyl acrylate, 10 parts of 4,4, 4-trifluorobutenoic acid, 5 parts of cyclohexanone peroxide and 3 parts of mercaptoethanol into a mixing kettle, and uniformly mixing to obtain a dropping liquid for later use;
(4) adding 35 parts of propylene glycol monobutyl ether into a reaction kettle under the condition of introducing nitrogen, heating to 125 ℃, slowly dropwise adding a dropwise adding liquid into the reaction kettle, keeping the temperature for reaction for 3 hours after dropwise adding is finished for 5 hours; then 0.5 part of cyclohexanone peroxide is added at 125 ℃, and the temperature is kept for 1 hour;
(5) and (3) cooling to 70 ℃, dropwise adding 15 parts of dimethylethanolamine into the mixture until the pH value of the system is 8, distilling under reduced pressure to remove the solvent and impurities until the mass fraction of the system is more than 85%, and then adding 90 parts of water into the mixture to stir and emulsify at high speed to obtain the aqueous fluorocarbon resin dispersion X.
Example 4
The waterproof weather-resistant bi-component exterior wall latex paint is characterized by consisting of A, B two components, wherein the component A comprises the following components in parts by weight: the paint comprises the following components, by weight, 36 parts of aqueous fluorocarbon resin dispersoid, 3 parts of 2,2, 4-trimethyl-1, 3-pentanediol diisobutyrate, 3 parts of BYK-3810.5 parts of carboxymethyl cellulose, 0.18 part of TEGO760W, 0.7 part of BYK-0380.28 parts of carbazone isothiazolinone, 32 parts of talcum powder and 18 parts of water; the component B is as follows: 4 parts of tetraisopropylbis (dioctyl acyloxy phosphite) titanate and 1.7 parts of perhydropolysilazane.
Example 5
A waterproof and weather-resistant bi-component emulsion paint for exterior walls is characterized by consisting of A, B two components, wherein the component A comprises the following components in parts by weight; the water-based fluorocarbon resin aqueous dispersion comprises, by weight, water-based fluorocarbon resin dispersion N35 parts, dihydroxy N-butyl ether 1 part, BYK-3331.0 parts, nonionic polyurethane associative thickener 0.3 part, TEGO715W 0.5 part, BYK-0350.25 parts, isothiazolinone 0.25 part, aluminum tripolyphosphate 40 part and water 15 part; the component B is as follows: 2 parts of isopropoxy tristearate titanate and 3 parts of perhydropolysilazane.
Example 6
A waterproof and weather-resistant bi-component emulsion paint for exterior walls is characterized by consisting of A, B two components, wherein the component A comprises the following components in parts by weight; the adhesive comprises water-based fluorocarbon resin dispersoid X40, tetraethylene glycol 5, BYK-3060.3, polyether associative polyurethane rheological thickener 0.1, TEGO 6851, BYK-0370.30, methylisothiazolinone 0.2, asbestos powder 25 and water 20; the component B comprises the following components: 5 parts of triethoxy epoxy isopropyl titanate and 1 part of perhydropolysilazane.
The preparation of the embodiment 4-6 is carried out by uniformly mixing materials of the A, B component according to a conventional method; the using method comprises the following steps: 1h before construction, the A, B components of examples 4-6 were mixed well and then applied to the surface of a cement wall by brushing.
Commercial one-component silicone-acrylic exterior wall latex paints were applied to the surface of the cement wall by brushing under the same conditions, and after completely drying, the performance test data of examples 4-6 and comparative examples are shown in table 1 below.
TABLE 1 Performance Table of the latex paints
It can be seen from table 1 that the examples and the comparative examples have better flexibility, adhesion, water resistance and alkali resistance, but the examples of the invention have higher hardness, better acid resistance, hydrophobic water resistance, ultraviolet resistance and better dirt-removing ability, have better comprehensive performance, and are more suitable for being used in projects with high construction requirements and more harsh environments.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes, modifications and variations can be made therein without departing from the spirit and scope of the invention as defined in the following claims.