CN112375487A - Water-based paint for waterproof exterior wall of building and spraying method thereof - Google Patents
Water-based paint for waterproof exterior wall of building and spraying method thereof Download PDFInfo
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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
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
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- 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
- C08K2201/011—Nanostructured additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/18—Spheres
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Abstract
The invention discloses a water-based paint for waterproof exterior walls of buildings and a spraying method thereof, and relates to the technical field of water-based paints. Firstly, reacting polyurethane emulsion with acrylate monomer to prepare composite emulsion, then treating nano-silica with a silane coupling agent to prepare the modified polylactic acid, firstly modifying glucan with cholesterol, then reacting with polylactic acid to prepare the modified polylactic acid, finally, weighing the composite emulsion, water, a composite additive, modified nano-silica and modified polylactic acid in sequence, mixing the composite emulsion, water and the composite additive, then mixing with the modified nano-silica and the modified polylactic acid respectively to prepare a first primer, a second primer, a first finish and a second finish, and coating the first primer, the second primer, the first finish and the second finish in sequence to finish spraying. The water-based paint for the waterproof exterior wall of the building, prepared by the invention, has excellent waterproof performance.
Description
Technical Field
The invention provides a water-based paint for waterproof exterior walls of buildings and a spraying method thereof, and relates to the technical field of water-based paints.
Background
The traditional oil paint generally takes organic matters such as banana oil, bananas and the like as diluents, and usually contains a large amount of harmful carcinogenic substances such as benzene, xylene and the like. And the oil paint has strong pungent smell which can volatilize into the air during the brushing and drying processes, and the oil paint not only has bad smell, but also contains a large amount of harmful substances to human bodies. The odor will dissipate after 1-2 months, but a large amount of harmful gas will slowly volatilize about 10-15 years. And the paint material of the oily paint can deteriorate and yellow in the process of continuously slowly releasing and volatilizing harmful substances for a long time. And the oily paint is extremely easy to burn and needs to be independently stored according to the fire-fighting requirement to prevent fire. And the use of oil paint requires professional training and practice, and daily painting and repair are troublesome for ordinary families. Along with the pressure of the environmental protection policy, the environmental protection awareness of consumers is continuously improved; particularly, the VOC emission limit standard is set in provinces and cities all over the country, and the development of environment-friendly coatings such as non-solvent type coatings, water-based paints and the like is encouraged to bring opportunities.
Although the water-based paint is superior to the traditional paint in environmental protection performance, the existing water-based paint products generally have the defects of difficult construction, water resistance, easy peeling, poor fullness, poor hardness and the like in physical performance. The traditional water-based paint only starts from a formula when solving the waterproof problem, so that the water-based paint cannot have better waterproof performance.
Disclosure of Invention
The invention aims to provide a water-based paint for waterproof exterior walls of buildings and a spraying method thereof, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the water-based paint for the waterproof outer wall of the building is characterized by consisting of a component A and a component B, wherein the component A mainly comprises the following raw material components in parts by weight: 85-90 parts of composite emulsion, 5-6 parts of water and 4-10 parts of composite additive; the component B mainly comprises the following raw material components in parts by weight: 30-40 parts of modified nano silicon dioxide and 10-20 parts of modified polylactic acid.
As optimization, the composite emulsion is prepared by reacting polyurethane emulsion with an acrylate monomer.
As optimization, the composite additive is prepared from a cosolvent, a mixed defoaming agent, a wetting agent, a slip agent and a flatting agent according to a mass ratio of 4.0: 1.2: 0.4: 0.3: 0.4 mixing; the mixed defoaming agent comprises Dehydran160 and Dehydran1293 in a mass ratio of 1: 1 are mixed.
As optimization, the modified nano-silica is prepared by treating nano-silica with a silane coupling agent; the modified polylactic acid is prepared by mixing modified glucan with polylactic acid after being modified by cholesterol.
The building waterproof exterior wall water-based paint is optimized to be composed of a component A and a component B, wherein the component A mainly comprises the following raw material components in parts by weight: 88 parts of composite emulsion, 6 parts of water and 6 parts of composite additive; the component B mainly comprises the following raw material components in parts by weight: 36 parts of modified nano silicon dioxide and 18 parts of modified polylactic acid.
As optimization, the spraying method of the water-based paint for the waterproof exterior wall of the building mainly comprises the following steps:
(1) weighing the composite emulsion, water, the composite additive, the modified nano-silica and the modified polylactic acid in sequence according to the parts by weight, stirring and mixing the composite emulsion, the water and the composite additive to obtain a component A, wherein the component A is prepared from the following components in a mass ratio of 2: 2: 3: dividing the mixture into four parts, namely A1, A2, A3 and A4 for later use;
(2) mixing the component A1 obtained in the step (1) with water according to the mass ratio of 1: 2, mixing, adding modified nano silicon dioxide with the mass of 0.6 time of that of the component A1, and stirring and mixing to obtain the primer I;
(3) mixing the component A2 obtained in the step (1) with water according to the mass ratio of 1: 2, mixing, adding the modified nano silicon dioxide with the mass of 0.6 of the component A2, and stirring and mixing to obtain a second primer;
(4) mixing the component A3 obtained in the step (1) and the modified polylactic acid according to the mass ratio of 5: 3, mixing to obtain first finish paint;
(5) mixing the component A4 obtained in the step (1) and the modified nano silicon dioxide according to the mass ratio of 5: 2, mixing to obtain a second finish paint;
(6) and (3) after the first primer obtained in the step (2) is coated on the outer wall, standing for 1-3 hours, continuously coating the second primer obtained in the step (3), coating the first finish obtained in the step (4) after the second primer is dried completely, coating the second finish obtained in the step (5) after the first finish is dried completely, and finishing the spraying work after the second finish is dried completely.
As optimization, the preparation method of the modified nano silicon dioxide in the step (1) comprises the following steps of mixing tetraethoxysilane and 90% ethanol solution in a mass ratio of 1: 50, adjusting the pH value to 9-10, stirring and reacting to obtain silica sol, and mixing the silica sol and a silane coupling agent KH-550 in a mass ratio of 40: 1-50: 1, stirring, reacting, rotating, concentrating and drying to obtain the modified nano silicon dioxide.
Optimally, the preparation method of the modified polylactic acid in the step (1) comprises the following steps of mixing glucan and water according to the mass ratio of 1: 100, adding potassium periodate with the mass 0.3-0.6 times that of glucan, stirring and reacting for 6-10 hours at the temperature of 0-2 ℃ under the condition of keeping out of the sun, dialyzing for 48 hours with deionized water, freeze-drying a product obtained after dialysis to obtain oxidized glucan, and mixing the oxidized glucan and dimethyl sulfoxide according to the mass ratio of 1: 50, adding triethylamine with the mass of 0.4-0.8 time that of the oxidized glucan, mixing and reacting for 4-8 hours in a nitrogen atmosphere, dialyzing for 48 hours with deionized water, and freeze-drying to obtain pretreated glucan; mixing the pretreated glucan and the pretreated cholesterol according to a mass ratio of 3: 1-6: 1, mixing, adding dimethyl sulfoxide with the mass being 20-50 times that of the pretreated glucan, stirring and reacting for 6-10 hours at room temperature to obtain a reactant, dialyzing the reactant for 48 hours with deionized water, and freeze-drying to obtain modified glucan, wherein the modified glucan and polylactic acid are mixed according to a mass ratio of 1: 3-1: and 5, mixing, adding dimethyl sulfoxide with the mass of 25-35 times that of the modified glucan, reacting for 2-4 hours at room temperature to obtain a modified polylactic acid mixture, dialyzing the modified polylactic acid mixture with deionized water for 48 hours, and freeze-drying to obtain the microsphere modified polylactic acid.
As an optimization, the preparation method of the composite emulsion in the step (1) comprises the following steps of mixing isophorone diisocyanate, polycaprolactone diol and dibutyltin dilaurate according to a mass ratio of 40: 30: 3, mixing, stirring for reaction, then adding dimethylolpropionic acid with the mass of 0.1-0.4 time of that of isophorone diisocyanate and trimethylolpropane with the mass of 0.2-0.3 time of that of isophorone diisocyanate, stirring for reaction, then adjusting the viscosity with methyl methacrylate and butyl acrylate to obtain polyurethane prepolymer dispersion, and then adding the polyurethane prepolymer dispersion; mixing polyurethane prepolymer dispersion liquid and hydroxyethyl acrylate according to a mass ratio of 60: 1-70: 1, adding allyloxy hydroxypropyl sodium sulfonate which is 0.01-0.05 times of the mass of a polyurethane prepolymer dispersion liquid, stirring and reacting to obtain a polyurethane emulsion, and mixing the polyurethane emulsion and potassium persulfate according to a mass ratio of 60: 1, mixing, stirring and reacting to obtain the composite emulsion.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, modified polylactic acid and modified nano-silica are added in the preparation of the water-based paint for the waterproof exterior wall of the building, firstly, the modified nano-silica can be embedded in the pore structure of the wall body, so that the adhesive force of the product is improved, the compactness of a paint film can be improved due to the existence of the nano-silica, so that the waterproof property of the product is improved, secondly, the added modified polylactic acid is in a porous microsphere structure with hydrophilic inner and outer sides, after the modified polylactic acid is added into the product, the water penetrating through the first layer of finish paint can be led out of the paint film through pores, so that the water resistance of the product is improved, and the outer layer of the paint film can form a mastoid structure due to larger particles of the modified polylactic acid.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to more clearly illustrate the method provided by the invention, the following examples are used for detailed description, and the test method of each index of the water-based paint for the waterproof exterior wall of the building, which is prepared in the following examples, is as follows:
and (3) testing the adhesive force: the adhesion of the paint films obtained in the examples to those obtained in the comparative examples was tested in accordance with GB/T9286.
Water resistance: the paint films obtained in the examples and the paint films obtained in the comparative examples were placed in an aging oven, a rain test was simulated, and the penetration time was measured.
Example 1
A building waterproof exterior wall water paint mainly comprises a component A and a component B, wherein the component A mainly comprises the following components in parts by weight: 88 parts of composite emulsion, 6 parts of water and 6 parts of composite additive; the component B mainly comprises: 36 parts of modified nano silicon dioxide and 18 parts of modified polylactic acid.
A spraying method of water-based paint for waterproof exterior walls of buildings mainly comprises the following steps:
(1) weighing the composite emulsion, water, the composite additive, the modified nano-silica and the modified polylactic acid in sequence according to the parts by weight, stirring and mixing the composite emulsion, the water and the composite additive to obtain a component A, wherein the component A is prepared from the following components in a mass ratio of 2: 2: 3: dividing the mixture into four parts, namely A1, A2, A3 and A4 for later use;
(2) mixing the component A1 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a first primer;
(3) mixing the component A2 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a second primer;
(4) mixing the component A3 obtained in the step (1) with modified polylactic acid to obtain first finish paint;
(5) mixing the component A4 obtained in the step (1) with modified nano silicon dioxide to obtain a second finish;
(6) and (3) after the first primer obtained in the step (2) is coated on the outer wall, standing for 1-3 hours, continuously coating the second primer obtained in the step (3), coating the first finish obtained in the step (4) after the second primer is dried completely, coating the second finish obtained in the step (5) after the first finish is dried completely, and finishing the spraying work after the second finish is dried completely.
As optimization, the preparation method of the modified nano silicon dioxide in the step (1) comprises the following steps of mixing tetraethoxysilane and 90% ethanol solution in a mass ratio of 1: 50, regulating the pH value to 10, stirring and reacting to obtain silica sol, and mixing the silica sol and a silane coupling agent KH-550 in a mass ratio of 40: 1, stirring, reacting, rotating, concentrating and drying to obtain the modified nano silicon dioxide.
Optimally, the preparation method of the modified polylactic acid in the step (1) comprises the following steps of mixing glucan and water according to the mass ratio of 1: 100, adding potassium periodate with the mass 0.3 time that of glucan, stirring and reacting for 10 hours at the temperature of 0 ℃ in the dark, dialyzing for 48 hours with deionized water, freeze-drying a product obtained after dialysis to obtain oxidized glucan, and mixing the oxidized glucan and dimethyl sulfoxide according to the mass ratio of 1: 50, adding triethylamine with the mass of 0.4 time that of the oxidized glucan, mixing and reacting for 8 hours in a nitrogen atmosphere, dialyzing for 48 hours with deionized water, and freeze-drying to obtain pretreated glucan; mixing the pretreated glucan and the pretreated cholesterol according to a mass ratio of 3: 1, mixing, adding dimethyl sulfoxide with the mass of 25 times that of the pretreated glucan, stirring and reacting for 6 hours at room temperature to obtain a reactant, dialyzing the reactant with deionized water for 48 hours, freeze-drying to obtain modified glucan, and mixing the modified glucan and polylactic acid according to a mass ratio of 1: 3, mixing, adding dimethyl sulfoxide with the mass of 25 times that of the modified glucan, reacting for 2 hours at room temperature to obtain a modified polylactic acid mixture, dialyzing the modified polylactic acid mixture with deionized water for 48 hours, and freeze-drying to obtain the microsphere modified polylactic acid.
As an optimization, the preparation method of the composite emulsion in the step (1) comprises the following steps of mixing isophorone diisocyanate, polycaprolactone diol and dibutyltin dilaurate according to a mass ratio of 40: 30: 3, mixing, stirring for reaction, adding dimethylolpropionic acid with the mass of 0.2 time of that of isophorone diisocyanate and trimethylolpropane with the mass of 0.2 time of that of isophorone diisocyanate, stirring for reaction, adjusting the viscosity by using methyl methacrylate and butyl acrylate to obtain polyurethane prepolymer dispersion, and dispersing the polyurethane prepolymer dispersion; mixing polyurethane prepolymer dispersion liquid and hydroxyethyl acrylate according to a mass ratio of 60: 1, adding allyloxy hydroxypropyl sodium sulfonate with the mass of 0.04 times of that of polyurethane prepolymer dispersion liquid, stirring for reaction to obtain polyurethane emulsion, and mixing the polyurethane emulsion and potassium persulfate according to the mass ratio of 60: 1, mixing, stirring and reacting to obtain the composite emulsion.
Example 2
A building waterproof exterior wall water paint mainly comprises a component A and a component B, wherein the component A mainly comprises the following components in parts by weight: 88 parts of composite emulsion, 6 parts of water and 6 parts of composite additive; the component B mainly comprises: 36 parts of modified nano silicon dioxide.
A spraying method of water-based paint for waterproof exterior walls of buildings mainly comprises the following steps:
(1) weighing the composite emulsion, water, the composite additive, the modified nano-silica and the modified polylactic acid in sequence according to the parts by weight, stirring and mixing the composite emulsion, the water and the composite additive to obtain a component A, wherein the component A is prepared from the following components in a mass ratio of 2: 2: 3: dividing the mixture into four parts, namely A1, A2, A3 and A4 for later use;
(2) mixing the component A1 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a first primer;
(3) mixing the component A2 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a second primer;
(4) mixing the component A3 obtained in the step (1) with water to obtain first finish paint;
(5) mixing the component A4 obtained in the step (1) with modified nano silicon dioxide to obtain a second finish;
(6) and (3) after the first primer obtained in the step (2) is coated on the outer wall, standing for 1-3 hours, continuously coating the second primer obtained in the step (3), coating the first finish obtained in the step (4) after the second primer is dried completely, coating the second finish obtained in the step (5) after the first finish is dried completely, and finishing the spraying work after the second finish is dried completely.
As optimization, the preparation method of the modified nano silicon dioxide in the step (1) comprises the following steps of mixing tetraethoxysilane and 90% ethanol solution in a mass ratio of 1: 50, regulating the pH value to 10, stirring and reacting to obtain silica sol, and mixing the silica sol and a silane coupling agent KH-550 in a mass ratio of 40: 1, stirring, reacting, rotating, concentrating and drying to obtain the modified nano silicon dioxide.
As an optimization, the preparation method of the composite emulsion in the step (1) comprises the following steps of mixing isophorone diisocyanate, polycaprolactone diol and dibutyltin dilaurate according to a mass ratio of 40: 30: 3, mixing, stirring for reaction, adding dimethylolpropionic acid with the mass of 0.2 time of that of isophorone diisocyanate and trimethylolpropane with the mass of 0.2 time of that of isophorone diisocyanate, stirring for reaction, adjusting the viscosity by using methyl methacrylate and butyl acrylate to obtain polyurethane prepolymer dispersion, and dispersing the polyurethane prepolymer dispersion; mixing polyurethane prepolymer dispersion liquid and hydroxyethyl acrylate according to a mass ratio of 60: 1, adding allyloxy hydroxypropyl sodium sulfonate with the mass of 0.04 times of that of polyurethane prepolymer dispersion liquid, stirring for reaction to obtain polyurethane emulsion, and mixing the polyurethane emulsion and potassium persulfate according to the mass ratio of 60: 1, mixing, stirring and reacting to obtain the composite emulsion.
Example 3
A building waterproof exterior wall water paint mainly comprises a component A and a component B, wherein the component A mainly comprises the following components in parts by weight: 88 parts of composite emulsion, 6 parts of water and 6 parts of composite additive; the component B mainly comprises: 36 parts of modified nano silicon dioxide and 18 parts of modified polylactic acid.
A spraying method of water-based paint for waterproof exterior walls of buildings mainly comprises the following steps:
(1) weighing the composite emulsion, water, the composite additive, the modified nano-silica and the modified polylactic acid in sequence according to the parts by weight, stirring and mixing the composite emulsion, the water and the composite additive to obtain a component A, wherein the component A is prepared from the following components in a mass ratio of 2: 2: 3: dividing the mixture into four parts, namely A1, A2, A3 and A4 for later use;
(2) mixing the component A1 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a first primer;
(3) mixing the component A2 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a second primer;
(4) mixing the component A3 obtained in the step (1) with modified nano silicon dioxide to obtain first finish paint;
(5) mixing the component A4 obtained in the step (1) with modified polylactic acid to obtain a second finish;
(6) and (3) after the first primer obtained in the step (2) is coated on the outer wall, standing for 1-3 hours, continuously coating the second primer obtained in the step (3), coating the first finish obtained in the step (4) after the second primer is dried completely, coating the second finish obtained in the step (5) after the first finish is dried completely, and finishing the spraying work after the second finish is dried completely.
As optimization, the preparation method of the modified nano silicon dioxide in the step (1) comprises the following steps of mixing tetraethoxysilane and 90% ethanol solution in a mass ratio of 1: 50, regulating the pH value to 10, stirring and reacting to obtain silica sol, and mixing the silica sol and a silane coupling agent KH-550 in a mass ratio of 40: 1, stirring, reacting, rotating, concentrating and drying to obtain the modified nano silicon dioxide.
Optimally, the preparation method of the modified polylactic acid in the step (1) comprises the following steps of mixing glucan and water according to the mass ratio of 1: 100, adding potassium periodate with the mass 0.3 time that of glucan, stirring and reacting for 10 hours at the temperature of 0 ℃ in the dark, dialyzing for 48 hours with deionized water, freeze-drying a product obtained after dialysis to obtain oxidized glucan, and mixing the oxidized glucan and dimethyl sulfoxide according to the mass ratio of 1: 50, adding triethylamine with the mass of 0.4 time that of the oxidized glucan, mixing and reacting for 8 hours in a nitrogen atmosphere, dialyzing for 48 hours with deionized water, and freeze-drying to obtain pretreated glucan; mixing the pretreated glucan and the pretreated cholesterol according to a mass ratio of 3: 1, mixing, adding dimethyl sulfoxide with the mass of 25 times that of the pretreated glucan, stirring and reacting for 6 hours at room temperature to obtain a reactant, dialyzing the reactant with deionized water for 48 hours, freeze-drying to obtain modified glucan, and mixing the modified glucan and polylactic acid according to a mass ratio of 1: 3, mixing, adding dimethyl sulfoxide with the mass of 25 times that of the modified glucan, reacting for 2 hours at room temperature to obtain a modified polylactic acid mixture, dialyzing the modified polylactic acid mixture with deionized water for 48 hours, and freeze-drying to obtain the microsphere modified polylactic acid.
As an optimization, the preparation method of the composite emulsion in the step (1) comprises the following steps of mixing isophorone diisocyanate, polycaprolactone diol and dibutyltin dilaurate according to a mass ratio of 40: 30: 3, mixing, stirring for reaction, adding dimethylolpropionic acid with the mass of 0.2 time of that of isophorone diisocyanate and trimethylolpropane with the mass of 0.2 time of that of isophorone diisocyanate, stirring for reaction, adjusting the viscosity by using methyl methacrylate and butyl acrylate to obtain polyurethane prepolymer dispersion, and dispersing the polyurethane prepolymer dispersion; mixing polyurethane prepolymer dispersion liquid and hydroxyethyl acrylate according to a mass ratio of 60: 1, adding allyloxy hydroxypropyl sodium sulfonate with the mass of 0.04 times of that of polyurethane prepolymer dispersion liquid, stirring for reaction to obtain polyurethane emulsion, and mixing the polyurethane emulsion and potassium persulfate according to the mass ratio of 60: 1, mixing, stirring and reacting to obtain the composite emulsion.
Comparative example
A building waterproof exterior wall water paint mainly comprises a component A and a component B, wherein the component A mainly comprises the following components in parts by weight: 88 parts of composite emulsion, 6 parts of water and 6 parts of composite additive; the component B mainly comprises: 36 parts of modified nano silicon dioxide.
A spraying method of water-based paint for waterproof exterior walls of buildings mainly comprises the following steps:
(1) weighing the composite emulsion, water, the composite additive, the modified nano-silica and the modified polylactic acid in sequence according to the parts by weight, stirring and mixing the composite emulsion, the water and the composite additive to obtain a component A, wherein the component A is prepared from the following components in a mass ratio of 2: 2: 3: dividing the mixture into four parts, namely A1, A2, A3 and A4 for later use;
(2) mixing the component A1 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a first primer;
(3) mixing the component A2 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a second primer;
(4) mixing the component A3 obtained in the step (1) with modified nano silicon dioxide to obtain first finish paint;
(5) mixing the component A4 obtained in the step (1) with water to obtain a second finish;
(6) and (3) after the first primer obtained in the step (2) is coated on the outer wall, standing for 1-3 hours, continuously coating the second primer obtained in the step (3), coating the first finish obtained in the step (4) after the second primer is dried completely, coating the second finish obtained in the step (5) after the first finish is dried completely, and finishing the spraying work after the second finish is dried completely.
As optimization, the preparation method of the modified nano silicon dioxide in the step (1) comprises the following steps of mixing tetraethoxysilane and 90% ethanol solution in a mass ratio of 1: 50, regulating the pH value to 10, stirring and reacting to obtain silica sol, and mixing the silica sol and a silane coupling agent KH-550 in a mass ratio of 40: 1, stirring, reacting, rotating, concentrating and drying to obtain the modified nano silicon dioxide.
As an optimization, the preparation method of the composite emulsion in the step (1) comprises the following steps of mixing isophorone diisocyanate, polycaprolactone diol and dibutyltin dilaurate according to a mass ratio of 40: 30: 3, mixing, stirring for reaction, adding dimethylolpropionic acid with the mass of 0.2 time of that of isophorone diisocyanate and trimethylolpropane with the mass of 0.2 time of that of isophorone diisocyanate, stirring for reaction, adjusting the viscosity by using methyl methacrylate and butyl acrylate to obtain polyurethane prepolymer dispersion, and dispersing the polyurethane prepolymer dispersion; mixing polyurethane prepolymer dispersion liquid and hydroxyethyl acrylate according to a mass ratio of 60: 1, adding allyloxy hydroxypropyl sodium sulfonate with the mass of 0.04 times of that of polyurethane prepolymer dispersion liquid, stirring for reaction to obtain polyurethane emulsion, and mixing the polyurethane emulsion and potassium persulfate according to the mass ratio of 60: 1, mixing, stirring and reacting to obtain the composite emulsion.
Examples of effects
The following table 1 shows the performance analysis results of the water-based paints for waterproof exterior walls of buildings using examples 1 to 3 of the present invention and comparative examples.
TABLE 1
From the comparison of the experimental data of example 1 and the comparative example in table 1, it can be found that when the modified polylactic acid is added in the preparation of the water-based paint for the waterproof exterior wall of the building, and the modified polylactic acid is added in the second layer of finish paint, the water resistance of the product can be effectively improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. The water-based paint for the waterproof outer wall of the building is characterized by consisting of a component A and a component B, wherein the component A mainly comprises the following raw material components in parts by weight: 85-90 parts of composite emulsion, 5-6 parts of water and 4-10 parts of composite additive; the component B mainly comprises the following raw material components in parts by weight: 30-40 parts of modified nano silicon dioxide and 10-20 parts of modified polylactic acid.
2. The water-based paint for waterproof exterior walls of buildings according to claim 1, wherein the composite emulsion is prepared by reacting polyurethane emulsion with acrylate monomer.
3. The water-based paint for the waterproof exterior wall of the building as claimed in claim 2, wherein the composite additive is prepared from a cosolvent, a mixed defoamer, a wetting agent, a slip agent and a leveling agent in a mass ratio of 4.0: 1.2: 0.4: 0.3: 0.4 mixing; the mixed defoaming agent comprises Dehydran160 and Dehydran1293 in a mass ratio of 1: 1 are mixed.
4. The water-based paint for waterproof exterior walls of buildings according to claim 3, wherein the modified nano-silica is prepared by treating nano-silica with a silane coupling agent; the modified polylactic acid is prepared by mixing modified glucan with polylactic acid after being modified by cholesterol.
5. The water-based paint for the waterproof exterior wall of the building as claimed in claim 3, wherein the water-based paint for the waterproof exterior wall of the building is composed of a component A and a component B, wherein the component A mainly comprises the following raw material components in parts by weight: 88 parts of composite emulsion, 6 parts of water and 6 parts of composite additive; the component B mainly comprises the following raw material components in parts by weight: 36 parts of modified nano silicon dioxide and 18 parts of modified polylactic acid.
6. A spraying method of water-based paint for waterproof exterior walls of buildings is characterized by mainly comprising the following steps:
(1) weighing the composite emulsion, water, the composite additive, the modified nano-silica and the modified polylactic acid in sequence according to the parts by weight, stirring and mixing the composite emulsion, the water and the composite additive to obtain a component A, wherein the component A is prepared from the following components in a mass ratio of 2: 2: 3: 3 is divided into four parts, marked as A1、A2、A3And A4Standby;
(2) mixing the component A1 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a first primer;
(3) mixing the component A2 obtained in the step (1) with water, adding a proper amount of modified nano silicon dioxide, and stirring and mixing to obtain a second primer;
(4) mixing the component A3 obtained in the step (1) with modified polylactic acid to obtain first finish paint;
(5) mixing the component A4 obtained in the step (1) with modified nano silicon dioxide to obtain a second finish;
(6) and (3) after the first primer obtained in the step (2) is coated on the outer wall, standing for 1-3 hours, continuously coating the second primer obtained in the step (3), coating the first finish obtained in the step (4) after the second primer is dried completely, coating the second finish obtained in the step (5) after the first finish is dried completely, and finishing the spraying work after the second finish is dried completely.
7. The spraying method of the water-based paint for the waterproof exterior wall of the building as claimed in claim 6, wherein the preparation method of the modified nano-silica in step (1) is that ethyl orthosilicate and an ethanol solution with a mass fraction of 90% are mixed according to a mass ratio of 1: 50, adjusting the pH value to 9-10, stirring and reacting to obtain silica sol, and mixing the silica sol and a silane coupling agent KH-550 in a mass ratio of 40: 1-50: 1, stirring, reacting, rotating, concentrating and drying to obtain the modified nano silicon dioxide.
8. The spraying method of the water-based paint for the waterproof exterior wall of the building as claimed in claim 6, wherein the preparation method of the modified polylactic acid in the step (1) is to mix the glucan and the water in a mass ratio of 1: 100, adding potassium periodate with the mass 0.3-0.6 times that of glucan, stirring and reacting for 6-10 hours at the temperature of 0-2 ℃ under the condition of keeping out of the sun, dialyzing for 48 hours with deionized water, freeze-drying a product obtained after dialysis to obtain oxidized glucan, and mixing the oxidized glucan and dimethyl sulfoxide according to the mass ratio of 1: 50, adding triethylamine with the mass of 0.4-0.8 time that of the oxidized glucan, mixing and reacting for 4-8 hours in a nitrogen atmosphere, dialyzing for 48 hours with deionized water, and freeze-drying to obtain pretreated glucan; mixing the pretreated glucan and the pretreated cholesterol according to a mass ratio of 3: 1-6: 1, mixing, adding dimethyl sulfoxide with the mass being 20-50 times that of the pretreated glucan, stirring and reacting for 6-10 hours at room temperature to obtain a reactant, dialyzing the reactant for 48 hours with deionized water, and freeze-drying to obtain modified glucan, wherein the modified glucan and polylactic acid are mixed according to a mass ratio of 1: 3-1: 5, mixing, adding dimethyl sulfoxide with the mass being 25-35 times that of the modified glucan, reacting for 2-4 hours at room temperature to obtain a modified polylactic acid mixture, dialyzing the modified polylactic acid mixture with deionized water for 48 hours, and freeze-drying to obtain microsphere modified polylactic acid;
the spraying method of the water-based paint for the waterproof exterior wall of the building as claimed in claim 6, wherein the preparation method of the composite emulsion in the step (1) is that the isophorone diisocyanate, polycaprolactone diol and dibutyltin dilaurate are mixed according to a mass ratio of 40: 30: 3, mixing, stirring for reaction, then adding dimethylolpropionic acid with the mass of 0.1-0.4 time of that of isophorone diisocyanate and trimethylolpropane with the mass of 0.2-0.3 time of that of isophorone diisocyanate, stirring for reaction, then adjusting the viscosity with methyl methacrylate and butyl acrylate to obtain polyurethane prepolymer dispersion, and then adding the polyurethane prepolymer dispersion; mixing polyurethane prepolymer dispersion liquid and hydroxyethyl acrylate according to a mass ratio of 60: 1-70: 1, adding allyloxy hydroxypropyl sodium sulfonate which is 0.01-0.05 times of the mass of a polyurethane prepolymer dispersion liquid, stirring and reacting to obtain a polyurethane emulsion, and mixing the polyurethane emulsion and potassium persulfate according to a mass ratio of 60: 1, mixing, stirring and reacting to obtain the composite emulsion.
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