CN112194942A - Waterproof and heat-insulating middle coating for outer wall and preparation method thereof - Google Patents
Waterproof and heat-insulating middle coating for outer wall and preparation 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
- 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
- C09D133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- 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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
Abstract
The invention relates to a waterproof and heat-insulating middle coating for an outer wall and a preparation method thereof, belonging to the technical field of building coatings, and comprising the following components in parts by weight: 35-50 parts of acrylic emulsion, 8-10 parts of titanium dioxide, 10-15 parts of heat-insulating filler, 8-12 parts of graphene oxide modified polyethylene glycol, 6-8 parts of hydrophobic agent, 1.5-2.5 parts of dispersing agent, 0.1-0.2 part of defoaming agent, 0.2-0.5 part of thickening agent, 2.0-2.5 parts of film-forming auxiliary agent and 20-25 parts of deionized water. The preparation method comprises the following steps: s1, mixing deionized water, a dispersing agent, a hydrophobic agent and a half of defoaming agent to obtain a dispersion liquid; s2, adding the heat insulation filler and the modified polyethylene glycol into the dispersion liquid obtained in the step S1, then sequentially adding the acrylic emulsion, the film-forming aid and the balance of the defoaming agent, and uniformly stirring to obtain a mixed liquid; and S3, adding a thickening agent into the mixed solution, and adjusting the viscosity to obtain the waterproof heat-preservation primer surfacer. The intermediate coating has the advantages of better heat insulation; in addition, the preparation method is simple to operate.
Description
Technical Field
The invention relates to the technical field of building coatings, in particular to a waterproof and heat-insulating middle coating for an outer wall and a preparation method thereof.
Background
The coating is a continuous film which is coated on the surface of a protected or decorated object and can form firm adhesion with the object to be coated, and is a viscous liquid which is prepared by taking resin, oil or emulsion as a main material, adding or not adding pigments and fillers, adding corresponding auxiliary agents and using organic solvent or water. In exterior wall building coatings, the specific gravity of water-based coatings is getting larger and larger, and the formula and construction process of the water-based coatings are getting mature. The water paint is generally divided into a primer, a middle paint and a finish paint, wherein the middle paint is arranged between the primer and the finish paint and is used as a transition layer for starting and stopping, and the water paint has certain filling property, can improve the roughness and the flatness of the primer, can improve the adhesive force and the fullness of the finish paint and enhances the decoration property of the finish paint. With the consumption of available energy, energy-saving materials attract wide attention of human beings, and the heat-insulating coating is a novel energy-saving material developed in recent years.
At present, a chinese patent publication No. CN108546466A, which is referred to in the prior art, specifically discloses a thermal insulation coating for an exterior wall, which comprises the following components in parts by mass: 30-50 parts of acrylic resin emulsion, 6-10 parts of glass hollow microspheres, 5-9 parts of nano far infrared ceramic powder, 10-16 parts of nano silicon dioxide powder, 5-15 parts of titanium dioxide, 6-9 parts of graphene, 1-3 parts of conductive powder, 0.1-1.5 parts of dispersing agent, 1-1.5 parts of defoaming agent, 0.4-0.8 part of pH regulator, 1-1.5 parts of anti-freezing agent, 0.8-1.5 parts of anti-settling agent, 0.4-1 part of preservative, 12-15 parts of film-forming additive, 0.8-1.8 parts of thickening agent and 60-80 parts of deionized water. The heat-insulating property of the coating is improved by adding the glass gap micro-beads and the far infrared ceramic powder into the coating.
In the related art, although the coating layer can reflect part of the wavelength, a large amount of heat is still present in the coating layer, and thus the heat is easily transferred to the surface of the coating, and the heat insulation effect is not ideal.
Disclosure of Invention
In order to improve the heat insulation effect of the coating, the application provides a waterproof heat insulation middle coating for an outer wall and a preparation method thereof.
In a first aspect, the application provides a waterproof and heat-insulating middle coating for an external wall, which adopts the following technical scheme:
the waterproof and heat-insulating middle coating for the outer wall comprises the following components in parts by weight: 35-50 parts of acrylic emulsion, 8-10 parts of titanium dioxide, 10-15 parts of heat-insulating filler, 8-12 parts of graphene oxide modified polyethylene glycol, 6-8 parts of hydrophobic agent, 1.5-2.5 parts of dispersing agent, 0.1-0.2 part of defoaming agent, 0.2-0.5 part of thickening agent, 2.0-2.5 parts of film-forming auxiliary agent and 20-25 parts of deionized water.
By adopting the technical scheme, the specific raw materials and the proportion are selected according to the formula, and the raw materials are synergistic, so that the prepared floating coat paint can reduce the heat in the coating layer, has a good heat insulation effect, and has a certain waterproof performance.
The polyethylene glycol modified by the graphene oxide has large phase-change latent heat quantity and wide phase-change temperature, and is added into the intermediate coat paint, the polyethylene glycol is changed into a liquid phase from a solid phase, so that the heat can be absorbed in the phase-change process, the heat in the coating layer can be absorbed, and the heat can be stored, thereby being beneficial to reducing the surface of heat transferred to a coating object, and improving the heat insulation and heat preservation effects of the coating. In addition, the high specific surface area of the graphene oxide is beneficial to improving the adsorption effect on the polyethylene glycol, effectively prevents the leakage of the polyethylene glycol, achieves solid-solid phase change and reduces the liquid leakage condition. The heat insulation filler has lower heat conductivity, can prolong the propagation path of heat and is beneficial to further improving the heat insulation effect of the intermediate coating.
Preferably, the modification method of the polyethylene glycol comprises the following steps,
(1) adding 20-30 parts of graphene oxide into 200-400 parts of DMF, and performing ultrasonic vibration to obtain a mixed solution A;
(2) adding 150 and 350 parts of polyethylene glycol into the mixed solution A, and performing ultrasonic vibration to obtain a mixed solution B;
(3) and filtering the mixed solution B, and freeze-drying the filtrate to obtain the modified polyethylene glycol.
Preferably, the ultrasonic vibration time in the step (1) is 20-25min, and the ultrasonic vibration time in the step (2) is 15-20 min.
By adopting the technical scheme, the graphene oxide is dispersed by adopting ultrasonic vibration, so that the improvement of the dispersibility of the graphene oxide is facilitated, and the modification effect on polyethylene glycol is improved.
Preferably, the heat insulation filler adopts modified hollow glass beads, and the modification method comprises the following steps:
By adopting the technical scheme, the hollow glass beads are small and hollow spherical powder. Because the interior of the hollow glass microspheres are added into the raw materials, and after the intermediate coating is dried, the hollow glass microspheres are closely arranged to form a complete hollow isolation layer, so that the hollow isolation layer has good heat insulation and heat preservation effects and excellent sound insulation effects.
The coupling agent is adopted to modify the hollow glass beads, so that the compatibility of the hollow glass beads and a matrix is increased, and the improvement of the dispersion uniformity of the hollow glass beads in the intermediate coating is facilitated, so that the heat insulation effect of the intermediate coating is better exerted, and the heat insulation effect of the intermediate coating is further improved.
Preferably, the coupling agent comprises a borate coupling agent and a silane coupling agent, and the weight ratio of the borate coupling agent to the silane coupling agent is (0.8-1.2): 1.
by adopting the technical scheme, the silane coupling agent contains more alkoxy groups and reactive groups, the alkoxy groups are changed into silicon hydroxyl groups through hydrolysis and are subjected to chemical reaction with hydroxyl groups on the surfaces of the surface hydroxylated hollow glass beads, and the reactive groups are bonded with the borate coupling agent through reaction, so that the silane coupling agent is matched with the borate coupling agent to form a coating layer on the surfaces of the surface hydroxylated hollow glass beads, the dispersibility of the surface hydroxylated hollow glass beads is improved, and the heat insulation effect of the middle painting is improved. In addition, the silane coupling agent is matched with the borate coupling agent, so that the connection strength with an organic matrix can be further increased, the condition that the middle coating generates cracks is reduced, and the waterproof performance is improved.
In addition, the hollow glass beads have the advantages that the main component of the hollow glass beads is borosilicate, the borosilicate has a strong adsorption effect with boron atoms in a borate coupling agent, so that the borate coupling agent can form an organic coating layer on the surfaces of the hollow glass beads, meanwhile, the boron atoms have certain flame retardant property, and the flame retardant property of the middle coating can be improved by modifying with the borate coupling agent.
Preferably, the mass concentration of the sodium hydroxide is 20-25%.
Preferably, said step
The drying condition in (1) is drying at 110-120 ℃ for 2-3 h.
Preferably, the film-forming assistant is one or two of benzyl alcohol and dodecyl alcohol ester.
By adopting the technical scheme, the compatibility of the benzyl alcohol and the acrylic emulsion is better, and the lowest film forming temperature of the acrylic emulsion is reduced by 0 ℃ by adding a small amount of the benzyl alcohol and the acrylic emulsion. The dodecyl alcohol ester has small water solubility, is easy to be absorbed by latex particles, can be directly released from colloidal particles, is easier to swell the colloidal particles, has low volatilization rate, is kept in a paint layer before film forming, cannot be influenced by water volatilization, and has better continuity of film forming; in addition, the dodecyl alcohol ester has proper volatility, and can be completely volatilized in a short time after the intermediate coating is formed, so that the performance of the coating is not influenced.
Preferably, the hydrophobic agent is dihydroxydiphenylsilane.
In a second aspect, the application provides a preparation method of a waterproof and heat-insulating middle coating for an external wall, which adopts the following technical scheme:
a preparation method of exterior wall waterproof heat-insulation primer surfacer comprises the following steps:
s1, mixing deionized water, a dispersing agent, a hydrophobic agent and a half of defoaming agent to obtain a dispersion liquid;
s2, adding titanium dioxide, heat insulation filler and modified polyethylene glycol into the dispersion liquid obtained in the step S1, stirring at the speed of 300-400r/min for 10-20min, sequentially adding acrylic emulsion, film-forming assistant and the balance defoaming agent, and stirring at the speed of 800-900r/min for 15-30min to obtain a mixed liquid;
and S3, adding a thickening agent into the mixed solution, and adjusting the viscosity to obtain the waterproof heat-preservation primer surfacer.
By adopting the technical scheme, the stirring speed and the stirring time of each step are strictly controlled, so that the raw materials can be fully and uniformly dispersed in the system, the agglomeration phenomenon is reduced, and the respective performances and the compounding performance of the raw materials are fully exerted.
The invention has the following beneficial effects:
1. the invention selects specific raw materials and proportion for matching use in the formula, utilizes the mutual coordination effect of the raw materials, and adopts a specific preparation method for preparation, so that the obtained intermediate coat has good heat insulation effect and waterproof performance.
2. The addition of the graphene oxide modified polyethylene glycol enables the polyethylene glycol to be heated and can absorb heat inside the coating layer in the phase change process, so that the condition that the heat is transferred to the surface of a coating is reduced, and the heat insulation effect of the intermediate coating is improved.
3. The graphene oxide is grafted to the polyethylene glycol, and by means of the adsorption effect of the high specific surface area of the graphene oxide on the polyethylene glycol, leakage of the polyethylene glycol is effectively prevented, solid-solid phase change is achieved, and the liquid leakage condition is reduced.
4. The coupling agent is adopted to modify the hollow glass beads, so that the compatibility of the hollow glass beads and a matrix is increased, and the improvement of the dispersion uniformity of the hollow glass beads in the intermediate coating is facilitated, so that the heat insulation effect of the intermediate coating is better exerted, and the heat insulation effect of the intermediate coating is further improved.
5. The silane coupling agent and the borate coupling agent are cooperatively matched to form a compact coating layer on the surface of the hollow glass microsphere, so that the dispersibility of the hollow glass microsphere is improved, and the heat insulation effect of the primer coat is further improved.
Detailed Description
The present invention will be described in further detail with reference to examples and comparative examples.
Preparation example
Preparation example 1
The preparation method of the modified polyethylene glycol comprises the following steps:
(1) adding 20g of graphene oxide into 400g of DMF, and performing ultrasonic vibration for 20min to obtain a mixed solution A;
(2) adding 150g of polyethylene glycol into the mixed solution A, and performing ultrasonic vibration for 20min to obtain a mixed solution B;
(3) and filtering the mixed solution B, and freeze-drying the filtrate to obtain the modified polyethylene glycol.
Wherein the polyethylene glycol is PEG1000, and is available from Shenyang Seini Euro chemical Co., Ltd;
graphene oxide was purchased from lake nan feng materials development ltd.
Preparation example 2
The preparation method of the modified polyethylene glycol comprises the following steps:
(1) adding 25g of graphene oxide into 300g of DMF, and ultrasonically vibrating for 22min to obtain a mixed solution A;
(2) adding 250g of polyethylene glycol into the mixed solution A, and performing ultrasonic vibration for 17min to obtain a mixed solution B;
(3) and filtering the mixed solution B, and freeze-drying the filtrate to obtain the modified polyethylene glycol.
Wherein the polyethylene glycol is PEG1000, and is available from Shenyang Seini Euro chemical Co., Ltd;
graphene oxide was purchased from lake nan feng materials development ltd.
Preparation example 3
The preparation method of the modified polyethylene glycol comprises the following steps:
(1) adding 30g of graphene oxide into 200g of DMF, and performing ultrasonic vibration for 25min to obtain a mixed solution A;
(2) adding 350g of polyethylene glycol into the mixed solution A, and performing ultrasonic vibration for 15min to obtain a mixed solution B;
(3) and filtering the mixed solution B, and freeze-drying the filtrate to obtain the modified polyethylene glycol.
Wherein the polyethylene glycol is PEG1000, and is available from Shenyang Seini Euro chemical Co., Ltd;
graphene oxide was purchased from lake nan feng materials development ltd.
Preparation example 4
The preparation method of the modified hollow glass bead comprises the following steps:
Wherein the coupling agent comprises a borate coupling agent and gamma-aminopropyltrimethoxysilane, and the weight ratio of the borate coupling agent to the gamma-aminopropyltrimethoxysilane is 1.2: 1.
Preparation example 5
The preparation method of the modified hollow glass bead comprises the following steps:
Wherein the coupling agent comprises a borate coupling agent and hexamethylenediamine methyl triethoxysilane, and the weight ratio of the borate coupling agent to the hexamethylenediamine methyl triethoxysilane is 1.0: 1.
Preparation example 6
The preparation method of the modified hollow glass bead comprises the following steps:
Wherein the coupling agent comprises a borate coupling agent and gamma-aminopropyltriethoxysilane, and the weight ratio of the borate coupling agent to the gamma-aminopropyltriethoxysilane is 0.8: 1.
Preparation example 7
The preparation method of the modified hollow glass bead is different from the preparation example 5 in that the same amount of borate coupling agent is used for replacing hexamethylene diamine methyl triethoxysilane.
Preparation example 8
The preparation method of the modified hollow glass bead is different from the preparation example 5 in that the same amount of hexamethylene diamine methyl triethoxy silane is used for replacing a borate coupling agent.
Preparation example 9
The preparation method of the modified hollow glass bead is different from the preparation example 5 in that the weight ratio of the borate coupling agent to the hexamethylene diamine methyl triethoxysilane is 0.7: 1.
Preparation example 10
The preparation method of the modified hollow glass bead is different from the preparation example 5 in that the weight ratio of the borate coupling agent to the hexamethylene diamine methyl triethoxysilane is 1.5: 1.
Examples
Example 1
The waterproof heat-insulating middle coating for the outer wall is prepared by the following steps:
s1, mixing 20g of deionized water, 1.5g of dispersing agent, 8g of hydrophobic agent and 0.1g of defoaming agent to obtain a dispersion liquid;
s2, adding 10g of titanium dioxide, 15g of the modified hollow glass microspheres prepared in preparation example 4 and 8g of the modified polyethylene glycol prepared in preparation example 1 into the dispersion liquid obtained in the step S1, stirring for 10min at 300r/min, sequentially adding 35g of acrylic emulsion, 2.5g of film-forming assistant and 0.1g of defoaming agent, and uniformly stirring to obtain a mixed liquid;
and S3, adding 0.2g of thickening agent into the mixed solution in the step S3, and adjusting the viscosity to obtain the waterproof heat-preservation primer surfacer.
Wherein the dispersant adopts disperbyk 118; the hydrophobic agent adopts dihydroxy diphenyl silane; the defoaming agent adopts commercially available DT-650; the film-forming auxiliary agent adopts benzyl alcohol; the thickening agent adopts PUR40 polyurethane which is commercially available; acrylic emulsions were obtained from Shandong Jinbande New building materials, Inc.
Example 2
The waterproof heat-insulating middle coating for the outer wall is prepared by the following steps:
s1, mixing 22g of deionized water, 2.0g of dispersing agent, 7g of hydrophobic agent and 0.07g of defoaming agent to obtain a dispersion liquid;
s2, adding 9g of titanium dioxide, 12g of modified hollow glass microspheres prepared in preparation example 5 and 10g of modified polyethylene glycol prepared in preparation example 2 into the dispersion liquid obtained in the step S1, stirring for 15min at 350r/min, sequentially adding 40g of acrylic emulsion, 2.2g of film-forming assistant and 0.08g of defoaming agent, and uniformly stirring to obtain a mixed liquid;
and S3, adding 0.3g of thickening agent into the mixed solution in the step S3, and adjusting the viscosity to obtain the waterproof heat-preservation primer surfacer.
Wherein the dispersant adopts disperbyk 180; the hydrophobic agent adopts dihydroxy diphenyl silane; the defoaming agent adopts commercially available DT-650; the film-forming auxiliary agent adopts dodecyl alcohol ester; the thickening agent adopts PUR40 polyurethane which is commercially available; acrylic emulsions were obtained from Shandong Jinbande New building materials, Inc.
Example 3
The waterproof heat-insulating middle coating for the outer wall is prepared by the following steps:
s1, mixing 25g of deionized water, 2.5g of dispersing agent, 6g of hydrophobic agent and 0.05g of defoaming agent to obtain a dispersion liquid;
s2, adding 8g of titanium dioxide, 10g of the modified hollow glass microspheres prepared in preparation example 6 and 12g of the modified polyethylene glycol prepared in preparation example 3 into the dispersion liquid obtained in the step S1, stirring at 400r/min for 20min, sequentially adding 50g of acrylic emulsion, 2g of film-forming assistant and 0.05g of defoaming agent, and uniformly stirring to obtain a mixed liquid;
and S3, adding 0.5g of thickening agent into the mixed solution in the step S3, and adjusting the viscosity to obtain the waterproof heat-preservation primer surfacer.
Wherein the dispersant adopts orotan 731A; the hydrophobic agent adopts dihydroxy diphenyl silane; the defoaming agent adopts commercially available DT-650; the film-forming auxiliary agent adopts dodecyl alcohol ester; the thickening agent adopts PUR40 polyurethane which is commercially available; acrylic emulsions were obtained from Shandong Jinbande New building materials, Inc.
Example 4
An exterior wall waterproof and heat-insulating primer surfacer prepared by the following method is different from example 2 in that the modified hollow glass beads prepared in preparation example 7 are used.
Example 5
The exterior wall waterproof and heat-insulating primer surfacer prepared by the method is different from the exterior wall waterproof and heat-insulating primer surfacer prepared in example 2 in that the modified hollow glass beads prepared in preparation example 8 are adopted.
Comparative example
Comparative example 1
The exterior wall waterproof and heat-insulation primer surfacer prepared by the method is different from the paint prepared in the embodiment 2 in that 30g of acrylic emulsion, 20g of modified hollow glass beads, 6g of modified polyethylene glycol, 3g of hydrophobic agent, 1g of dispersing agent, 0.3g of defoaming agent, 0.1g of thickening agent, 2.5g of film-forming assistant and 15g of deionized water.
Comparative example 2
The exterior wall waterproof and heat-insulation primer surfacer prepared by the method is different from the paint prepared in the embodiment 2 in 55g of acrylic emulsion, 8g of modified hollow glass beads, 15g of modified polyethylene glycol, 5g of hydrophobic agent, 3g of dispersing agent, 0.05g of defoaming agent, 0.7g of thickening agent, 1.5g of film-forming assistant and 30g of deionized water.
Comparative example 3
An exterior wall waterproof and heat-insulating primer surfacer prepared by the following method is different from example 2 in that the modified hollow glass beads prepared in preparation example 9 are used.
Comparative example 4
An exterior wall waterproof and heat-insulating primer surfacer prepared by the following method is different from the exterior wall waterproof and heat-insulating primer surfacer prepared in example 2 in that the modified hollow glass beads prepared in preparation example 10 are used.
Comparative example 5
An exterior wall water-proofing heat-insulating primer surfacer prepared by the following method is different from the paint prepared in example 2 in that the modified hollow glass beads are replaced by the same amount of unmodified hollow glass beads.
Comparative example 6
An exterior wall waterproof and heat-insulating primer surfacer prepared by the following method is different from the paint prepared in example 2 in that the same amount of unmodified polyethylene glycol is used for replacing the modified polyethylene glycol.
Performance detection
The intercoats prepared in examples 1-5 and comparative examples 1-6 were tested for thermal insulation, water resistance and adhesion, and the results are shown in Table 1.
Heat insulation: the thermal insulation was tested using the method described in ASTM C1549.
Water resistance: water resistance was measured according to the protocol of GB/T5210-2006.
Adhesion force: the adhesion was determined using the method of GB/T9286-1998.
Table 1 results of the paint test
| Item | Thermal insulation | Water resistance | Adhesion force |
| Example 1 | 0.948 | No abnormality | Level 0 |
| Example 2 | 0.951 | No abnormality | Level 0 |
| Example 3 | 0.950 | No abnormality | Level 0 |
| Example 4 | 0.940 | No abnormality | Level 0 |
| Example 5 | 0.939 | No abnormality | Level 0 |
| Comparative example 1 | 0.921 | No abnormality | Level 1 |
| Comparative example 2 | 0.920 | No abnormality | Level 1 |
| Comparative example 3 | 0.941 | No abnormality | Level 0 |
| Comparative example 4 | 0.942 | No abnormality | Level 0 |
| Comparative example 5 | 0.914 | No abnormality | Level 1 |
| Comparative example 6 | 0.901 | No abnormality | Level 1 |
By combining the examples 1-5 and the comparative examples 1-2, and by combining the table 1, it can be seen that the heat insulation performance and the adhesion of the intermediate coating in the examples 1-5 are superior to those of the comparative examples 1-2, which shows that the specific raw materials and the mixture ratio selected in the formula of the application are scientific and reasonable, and the raw materials act synergistically, so that the prepared intermediate coating has better heat insulation and preservation effects, better adhesion and better waterproofness.
Combining example 2 and comparative examples 3-4, and table 1, it can be seen that the thermal insulation, water resistance and adhesion of the basecoat in example 2, due to comparative examples 3-4, illustrates the weight ratio of borate ester coupling agent to silane coupling agent in the range of (0.8-1.2): 1, the hollow glass microspheres have better modification effect, so that the dispersibility of the hollow glass microspheres can be increased, the heat insulation effect can be better exerted, and the heat insulation performance of the middle coating is improved. In addition, the silane coupling agent is matched with the borate coupling agent, so that the connection strength with an organic matrix can be further increased, the condition that the middle coating generates cracks is reduced, and the waterproof performance is improved.
By combining the example 2 and the comparative example 5 and combining the table 1, the thermal insulation performance of the primer surfacer in the example 2 is higher than that in the comparative example 5, which shows that the dispersibility of the hollow glass beads can be improved by modifying the hollow glass beads with the coupling agent, so that the thermal insulation performance of the hollow glass beads can be better exerted, and the thermal insulation effect of the primer surfacer can be further improved.
Combining example 2 and comparative example 6, and combining table 1, it can be seen that the thermal insulation performance of the primer surfacer of example 2 is higher than that of comparative example 6, which shows that modifying polyethylene glycol with graphene oxide is helpful for increasing the thermal insulation performance of the primer surfacer.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The waterproof heat-insulation middle coating for the outer wall is characterized by comprising the following components in parts by weight: 35-50 parts of acrylic emulsion, 8-10 parts of titanium dioxide, 10-15 parts of heat-insulating filler, 8-12 parts of graphene oxide modified polyethylene glycol, 6-8 parts of hydrophobic agent, 1.5-2.5 parts of dispersing agent, 0.1-0.2 part of defoaming agent, 0.2-0.5 part of thickening agent, 2.0-2.5 parts of film-forming auxiliary agent and 20-25 parts of deionized water.
2. The exterior wall waterproof heat-insulating primer surfacer according to claim 1, wherein: the modification method of the polyethylene glycol comprises the following steps,
(1) adding 20-30 parts of graphene oxide into 200-400 parts of DMF, and performing ultrasonic vibration to obtain a mixed solution A;
(2) adding 150 and 350 parts of polyethylene glycol into the mixed solution A, and performing ultrasonic vibration to obtain a mixed solution B;
(3) and filtering the mixed solution B, and freeze-drying the filtrate to obtain the modified polyethylene glycol.
3. The exterior wall waterproof heat-insulating primer surfacer according to claim 2, wherein: the ultrasonic vibration time in the step (1) is 20-25min, and the ultrasonic vibration time in the step (2) is 15-20 min.
4. The exterior wall waterproof heat-insulating primer surfacer according to claim 1, wherein: the heat insulation filler adopts modified hollow glass beads, and the modification method comprises the following steps:
5. The exterior wall waterproof heat-insulating primer surfacer according to claim 4, wherein: the coupling agent comprises a borate coupling agent and a silane coupling agent, wherein the weight ratio of the borate coupling agent to the silane coupling agent is (0.8-1.2): 1.
6. the exterior wall waterproof heat-insulating primer surfacer according to claim 4, wherein: the mass concentration of the sodium hydroxide is 20-25%.
7. The exterior wall waterproof heat-insulating primer surfacer according to claim 4, wherein: said step (c) is
The drying condition in (1) is drying at 110-120 ℃ for 2-3 h.
8. The exterior wall waterproof heat-insulating primer surfacer according to claim 1, wherein: the film-forming auxiliary agent is one or two of benzyl alcohol and dodecyl alcohol ester.
9. The exterior wall waterproof heat-insulating primer surfacer according to claim 1, wherein: the hydrophobic agent adopts dihydroxy diphenyl silane.
10. A method for preparing the exterior wall waterproof heat-insulating primer surfacer of any one of claims 1 to 9, which comprises the following steps:
s1, mixing deionized water, a dispersing agent, a hydrophobic agent and a half of defoaming agent to obtain a dispersion liquid;
s2, adding titanium dioxide, heat insulation filler and modified polyethylene glycol into the dispersion liquid obtained in the step S1, stirring for 10-20min at the speed of 300-400r/min, sequentially adding acrylic emulsion, film-forming assistant and the balance of defoaming agent, and uniformly stirring to obtain a mixed liquid;
and S3, adding a thickening agent into the mixed solution, and adjusting the viscosity to obtain the waterproof heat-preservation primer surfacer.
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| CN112194942B (en) | 2022-02-01 |
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