WO2023082740A1 - 一种水性聚氨酯防水涂料及其制备方法及应用 - Google Patents

一种水性聚氨酯防水涂料及其制备方法及应用 Download PDF

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WO2023082740A1
WO2023082740A1 PCT/CN2022/112006 CN2022112006W WO2023082740A1 WO 2023082740 A1 WO2023082740 A1 WO 2023082740A1 CN 2022112006 W CN2022112006 W CN 2022112006W WO 2023082740 A1 WO2023082740 A1 WO 2023082740A1
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water
polyurethane coating
based polyurethane
total mass
stearate
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PCT/CN2022/112006
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English (en)
French (fr)
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马世界
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江苏凯伦建材股份有限公司
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Publication of WO2023082740A1 publication Critical patent/WO2023082740A1/zh

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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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/004—Reflecting paints; Signal paints
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • 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
    • 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
    • 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
    • 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
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3045—Sulfates

Definitions

  • the invention belongs to the field of architectural coatings, and in particular relates to a water-based polyurethane waterproof coating and a preparation method and application thereof.
  • Polyurethane waterproof coatings have become one of the mainstream waterproof coatings on the market due to their excellent mechanical properties, acid and alkali resistance, etc., but most of them are solvent-based coatings with strong odor and poor environmental protection, which seriously endanger the environment and human health.
  • Water-based polyurethane waterproof coatings use water as a solvent, which has excellent performance and meets increasingly stringent environmental protection requirements.
  • Patent CN202110678125.X discloses a water-based polyurethane waterproof coating with excellent heat insulation and reflection properties. Among its physical properties, tensile strength, elongation at break, low temperature flexibility and water impermeability can all meet JC/T 864-2008 polymer Standards for emulsion architectural waterproof coatings; the performance of solar reflectance, near-infrared reflectance, hemispherical reflectance, the change rate of solar reflectance after pollution, and the thermal insulation temperature difference from the reference blackboard all meet GB/T25261-2018 for construction In the standard of reflective heat insulation coatings, it is the functional standard of reflective heat insulation flat coating topcoat.
  • the purpose of the present invention is to provide a water-based polyurethane waterproof coating with excellent mechanical properties, aging resistance, reflective heat insulation properties and self-cleaning function.
  • the first aspect of the present invention provides a kind of water-based polyurethane coating, comprises water-based polyurethane dispersion and inorganic filler, described water-based polyurethane coating also comprises stearate, hydrophobic agent, reflective filler, high-gloss emulsion, described stearate
  • the consumption of the described water-based polyurethane coating is 0.5% ⁇ 5% of the total mass; the consumption of the described hydrophobic agent is 0.1% ⁇ 1% of the total mass of the described water-based polyurethane coating; the consumption of the reflective filler It is 5%-10% of the total mass of the water-based polyurethane paint; the amount of the high-gloss emulsion is 0.5%-5% of the total mass of the water-based polyurethane paint.
  • the amount of the stearate is 0.5%-2.5% of the total mass of the water-based polyurethane coating.
  • the amount of the hydrophobic agent is 0.1%-0.6% of the total mass of the water-based polyurethane coating.
  • the amount of the reflective filler is 5%-8% of the total mass of the water-based polyurethane coating.
  • the amount of the high-gloss emulsion is 0.5%-3% of the total mass of the water-based polyurethane coating.
  • the aqueous polyurethane dispersion is an anionic aqueous polyurethane dispersion and/or a nonionic aqueous polyurethane dispersion.
  • the anionic aqueous polyurethane dispersion is an anionic aromatic polyether polyurethane dispersion;
  • the nonionic aqueous polyurethane dispersion is an aliphatic polyester polyurethane sub-monomer.
  • Wanhua Chemical Group's 7351 waterborne polyurethane dispersion or 3233A waterborne polyurethane dispersion are examples of the anionic aqueous polyurethane dispersion.
  • the amount of the water-based polyurethane dispersion is 40%-60% of the total mass of the water-based polyurethane coating, more preferably 45-55%.
  • the solid content of the aqueous polyurethane dispersion is 44-56%
  • the viscosity is 10-3000 mPa ⁇ s
  • the pH value is 6-9.
  • the tensile strength of the aqueous polyurethane dispersion is 30-45 MPa
  • the elongation is 700%-800%
  • the 100% modulus is 1.5-2.5 MPa.
  • the high-gloss emulsion is a water-based polyacrylate high-gloss emulsion.
  • the high-gloss emulsion has a solid content of 45-50%, a particle size of 0.1-0.2 ⁇ m, a pH value of 7-9, and a viscosity of 50-450 mPa ⁇ s.
  • the stearate is one or more of calcium stearate, zinc stearate and barium stearate.
  • the hydrophobic agent is one or more of polydimethylsiloxane aqueous dispersion, polyethylene wax aqueous dispersion, and paraffin wax aqueous dispersion.
  • the reflective filler is one or more of glass microspheres, aluminum powder, and pearl powder.
  • the particle size of the reflective filler is 800-1500 mesh.
  • the amount of the inorganic filler is 10%-60% of the total mass of the water-based polyurethane coating, more preferably 30%-50%.
  • the inorganic filler is one or more of calcium carbonate, barium sulfate, kaolin, titanium dioxide, silica fume, and talc.
  • the particle size of the inorganic filler is 800-2000 mesh.
  • the water-based polyurethane coating also includes an auxiliary agent, the amount of the auxiliary agent is 2% to 10% of the total mass of the water-based polyurethane coating, and the auxiliary agent includes water, dispersant, disinfectant One or more of foaming agents, film-forming aids, preservatives, and thickeners.
  • the mass ratio of the water, dispersant, defoamer, film-forming aid, preservative and thickener is (3 ⁇ 6):(0.2 ⁇ 0.5):(0.2 ⁇ 0.5):(0.3 ⁇ 0.6):(0.08 ⁇ 0.2):(0.2 ⁇ 0.5).
  • the dispersant is polyacrylic acid sodium salt dispersant.
  • the defoamer is a silicone defoamer and/or a mineral oil defoamer.
  • the film-forming aid is one or more of alcohol ester-12, diisobutyl adipate, dipropylene glycol methyl ether, and dipropylene glycol butyl ether.
  • the preservatives are isothiazolinone preservatives and/or benzimidazole ester preservatives.
  • the thickener is alkali-swellable thickener and/or polyurethane associative thickener.
  • the second aspect of the present invention also provides a method for preparing the water-based polyurethane coating, mixing water-based polyurethane dispersions, stearates, hydrophobic agents, inorganic fillers, reflective fillers, high-gloss emulsions and additives to obtain the water-based polyurethane paint.
  • the stirring speed during mixing is controlled to be 200-1200r/min.
  • the auxiliary agents include water, dispersants, defoamers, film-forming aids, preservatives and thickeners.
  • Described preparation method is specifically:
  • water, stearate, dispersant, inorganic filler, and reflective filler are mixed at a stirring speed of 800 to 1200 r/min to form a slurry, and then the slurry is mixed with water-based polyurethane emulsion and high-gloss emulsion , hydrophobic agent, defoamer, film-forming aid, preservative and thickener are mixed under the condition of stirring speed of 300-600r/min to obtain the water-based polyurethane coating.
  • the third aspect of the present invention also provides an application of the waterborne polyurethane coating in photovoltaic roofing.
  • the present invention has the following advantages compared with the prior art:
  • the Water-based polyurethane coating of the present invention stearate, hydrophobic agent, reflective filler and high-gloss emulsion are added at the same time, and through the synergistic effect of the components and proportioning of the water-based polyurethane coating, while improving its mechanical properties and aging resistance, it makes the Water-based polyurethane coatings have self-cleaning ability and higher sunlight reflection ability, which can achieve energy saving, environmental protection, aesthetics and practicality, long-term waterproof, long service life, and can significantly improve power generation efficiency when used on photovoltaic roofs.
  • the invention provides a kind of water-based polyurethane coating, comprises water-based polyurethane dispersion and inorganic filler, described water-based polyurethane coating also comprises stearate, hydrophobic agent, reflective filler, highlight emulsion, and the consumption of described stearate is 0.5% to 5% of the total mass of the water-based polyurethane coating; the amount of the hydrophobic agent is 0.1% to 1% of the total mass of the water-based polyurethane coating; the amount of the reflective filler is the 5%-10% of the total mass of the water-based polyurethane paint; the amount of the high-gloss emulsion is 0.5%-5% of the total mass of the water-based polyurethane paint.
  • the waterproof coating of the invention uses water-based polyurethane as the main film-forming substance, and is more friendly to the environment and construction personnel.
  • water-based polyurethane as the main film-forming substance, and is more friendly to the environment and construction personnel.
  • stearate, hydrophobic agent, reflective filler and high-gloss emulsion at the same time, it can endow the coating film with lotus leaf effect and high gloss, improve its self-cleaning ability and sunlight reflection ability;
  • Its physical properties, so as to achieve energy saving, emission reduction, beautiful and practical effects, applied to photovoltaic roofs can significantly improve its power generation efficiency, promote the development of new energy industries, and help achieve the "double carbon" goal.
  • the aqueous polyurethane dispersion is an anionic aqueous polyurethane dispersion and/or a nonionic aqueous polyurethane dispersion.
  • the solid content of the aqueous polyurethane dispersion is 44-56%, the viscosity is 10-3000mPa ⁇ s, and the pH value is 6-9.
  • the water-based polyurethane emulsion used is Wanhua Chemical Group's 7351 waterborne polyurethane dispersion.
  • the amount of the water-based polyurethane dispersion is 40% to 60% of the total mass of the water-based polyurethane coating, such as 45%, 46%, 47%, 48%, 49%, 50%, 52% , 55%, 58%. If the amount of the water-based polyurethane dispersion is too low, its physical properties cannot meet the use requirements, and if the amount of the water-based polyurethane dispersion is too high, the cost will be high.
  • the high-gloss emulsion is a water-based polyacrylate high-gloss emulsion
  • the solid content of the high-gloss emulsion is 45-55%
  • the particle size is 0.1-0.2 ⁇ m
  • the pH value is 7-9
  • the viscosity is 50 ⁇ 450mPa ⁇ s.
  • the amount of the high-gloss emulsion is 0.5%-5% of the total mass of the water-based polyurethane coating, such as 1%, 1.5%, 2%, 2.5%, 3%, 3.5%. If the amount of the high-gloss emulsion is too low, the solar reflection performance of the water-based polyurethane coating will not be significantly improved; if the amount of the high-gloss emulsion is too high, the cost will increase significantly and the elasticity will decrease.
  • the high-gloss emulsion used is Bardford GF-B3665G general-purpose high-gloss finish paint emulsion.
  • the stearate is one or more of calcium stearate, zinc stearate, and barium stearate.
  • the amount of the stearate is 0.5%-5% of the total mass of the water-based polyurethane coating, such as 0.5%, 1%, 1.5%, 2%, 2.5%. If the amount of stearate is too low, the stain resistance of water-based polyurethane paint is slightly lower; if the amount of stearate is too high, the cost will rise significantly, and other physical properties will be affected to a certain extent. .
  • the hydrophobic agent is one or more of polydimethylsiloxane aqueous dispersion, polyethylene wax aqueous dispersion, and paraffin wax aqueous dispersion.
  • the amount of the hydrophobic agent is 0.1%-1% of the total mass of the water-based polyurethane coating, such as 0.1%, 0.2%, 0.3%, 0.4%, 0.5%. If the hydrophobic agent is combined with the stearate, if the amount of the hydrophobic agent is too low, the stain resistance of the water-based polyurethane coating will be slightly lower; if the amount of the hydrophobic agent is too high, the cost will increase.
  • the reflective filler is one or more of glass microspheres, aluminum powder, and pearl powder.
  • the particle size of the reflective filler is 800-1500 mesh.
  • the amount of the reflective filler is 5% to 10% of the total mass of the water-based polyurethane coating, such as 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5% %,9%. If the amount of the reflective filler is too low, the solar reflection performance of the water-based polyurethane coating will decrease; if the amount of the reflective filler is too high, its elasticity will be significantly reduced.
  • the inorganic filler is one or more of calcium carbonate, barium sulfate, kaolin, titanium dioxide, silica fume, and talc.
  • the particle size of the inorganic filler is 800-2000 mesh.
  • the amount of the inorganic filler is 10% to 60% of the total mass of the water-based polyurethane coating, such as 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37% %, 38%, 40%, 42%, 44%, 46%, 48%. If the amount of the inorganic filler is too low, the cost of the water-based polyurethane coating will increase significantly; if the amount of the inorganic filler is too high, the elasticity of the water-based polyurethane coating will be poor.
  • the water-based polyurethane coating further includes auxiliary agents, and the auxiliary agents include one or more of water, dispersants, defoamers, film-forming aids, preservatives, and thickeners.
  • the amount of the auxiliary agent is 2%-10% of the total mass of the water-based polyurethane coating, more preferably 4%-8%.
  • the mass ratio of the water, dispersant, defoamer, film-forming aid, preservative and thickener is (3 ⁇ 6):(0.2 ⁇ 0.5):(0.2 ⁇ 0.5):(0.3 ⁇ 0.6):(0.08 ⁇ 0.2):(0.2 ⁇ 0.5).
  • the dispersant is polyacrylic acid sodium salt dispersant.
  • the defoamer is a silicone defoamer and/or a mineral oil defoamer.
  • silicone defoamer and/or a mineral oil defoamer.
  • the film-forming aid is one or more of alcohol ester-12, diisobutyl adipate, dipropylene glycol methyl ether, and dipropylene glycol butyl ether, which improves the film-forming mechanism of the emulsion and promotes film-forming .
  • preservatives are isothiazolinone preservatives and/or benzimidazole ester preservatives.
  • the preferred type of preservative is better coordinated with other components in the formula to make the preservative effect better.
  • the thickener is an alkali-swellable thickener and/or a polyurethane associative thickener.
  • Polyurethane associative thickener is preferred, which can adjust the viscosity of the product while improving the leveling property of the product, so as to make the coating film smooth and smooth.
  • the preparation method of waterborne polyurethane coating of the present invention is specially:
  • the slurry fineness is below 20 ⁇ m (tested with a scraper fineness meter).
  • the mixing operation is performed at normal temperature.
  • the preparation process of the water-based polyurethane coating of the present invention is simple and convenient, and consumes less time. By controlling the stirring speed in different sections, the finished product is fine and air-free.
  • the mass percentage of the water-based polyurethane dispersion, high-gloss emulsion, etc. is based on the mass percentage of the dispersion or emulsion to the total mass of the final product water-based polyurethane coating.
  • Water-based polyurethane is used as the main film-forming material, which is environmentally friendly and healthy. At the same time, by coordinating with other components, the finished product has excellent mechanical properties, acid and alkali resistance, and realizes long-term waterproofing.
  • the aqueous polyurethane dispersion is 7351 water-based polyurethane dispersion; the high-gloss emulsion is Bardford GF-B3665G emulsion; the polydimethylsiloxane aqueous dispersion is Dow Corning DC51; the polyacrylic acid sodium salt dispersant is Dow 731A; the defoamer is Dow Chemical 731A; The thickener is Dow RM-2020.
  • Example 1-3 and Comparative Examples 1-4 are shown in Table 1.
  • Preparation method first mix water, calcium stearate, polyacrylic acid sodium salt dispersant, inorganic filler barium sulfate and titanium dioxide, and reflective filler glass microspheres at a stirring speed of 1000/min to form a slurry (use a scraper to finely The fineness of the slurry is tested by a degree meter and the fineness is lower than 20 ⁇ m), and then the slurry and water-based polyurethane emulsion, high-gloss emulsion, polydimethylsiloxane aqueous dispersion, defoamer, film-forming aid, preservative and The thickener was mixed at a stirring speed of 500 r/min to obtain the water-based polyurethane coatings of Examples 1-3 and Comparative Examples 1-4.
  • the water-based polyurethane coatings obtained in Examples 1 to 3 and Comparative Examples 1 to 4 are based on Type II indicators in JC/T 864-2008 "Polymer Emulsion Waterproof Coatings for Buildings” and GB/T31815-2015 "Self-cleaning coatings for exterior surfaces of buildings”.
  • the self-cleaning properties of the products in "Coatings” and the functional indicators of the reflective heat-insulating flat coating topcoat in GB/T25261-2018 "Reflective and heat-insulating coatings for buildings” were tested. The test results are shown in Table 2.
  • the water-based polyurethane waterproof coatings with self-cleaning function obtained in Examples 1-3 have excellent mechanical properties, acid and alkali resistance and artificial weathering resistance, which can effectively solve the pain points of building leakage and achieve long-term waterproofing; the coating film has excellent Self-cleaning ability and heat insulation function meet the needs of energy saving, emission reduction, aesthetics and practicality.
  • a higher solar reflectance can increase the absorption rate of reflected light by the photovoltaic system, thereby improving power generation efficiency.
  • the addition of calcium stearate, polydimethylsiloxane aqueous dispersion, and Bardford GF-B3665G emulsion can reduce the surface energy of the coating film, improve the gloss, prevent impurities from adhering to the surface, and realize the self-cleaning function. At the same time, further Improve the reflection and heat insulation ability of the coating film.
  • Example 2 Compared with Example 1, Example 2 has slightly reduced The proportion of 7351 water-based polyurethane dispersion, the mechanical properties of the coating film decreased slightly, but still met the standard requirements.
  • Example 3 moderately increases the ratio of calcium stearate, polydimethylsiloxane aqueous dispersion, and Bardford GF-B3665G emulsion, further reduces the surface energy of the coating film, improves gloss, and gives the coating film Higher self-cleaning ability and reflective heat insulation ability.
  • Comparative Example 1 does not use calcium stearate, polydimethylsiloxane aqueous dispersion and Buddrich GF-B3665G emulsion, the surface energy of the coating film is higher, the gloss is lower, and impurities are easy to adhere to The surface does not meet the requirements of self-cleaning characteristics, and at the same time, the ability of reflective heat insulation is significantly reduced.
  • Comparative Example 2 does not use polydimethylsiloxane aqueous dispersion, although the amount of calcium stearate is moderately increased, but the self-cleaning property is still significantly reduced.
  • Example 3 compared with Example 3, the Budford GF-B3665G emulsion was not used, and the amount of polydimethylsiloxane aqueous dispersion and calcium stearate was moderately increased, and the reflective heat insulation ability decreased significantly, while the tensile strength also declined.
  • Example 3 Compared with Example 3, calcium stearate was not used in Comparative Example 4, and the dosage of polydimethylsiloxane aqueous dispersion and Bardford GF-B3665G emulsion was moderately increased, and the self-cleaning properties and elongation at break of the coating film were significantly reduced. .

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

本发明涉及一种水性聚氨酯涂料及其制备方法及应用，该水性聚氨酯涂料包括水性聚氨酯分散体、无机填料、硬脂酸盐、疏水剂、反光填料、高光乳液，其中，硬脂酸盐的用量为水性聚氨酯涂料的总质量的0.5％～5％，疏水剂的用量为水性聚氨酯涂料的总质量的0.1％～1％，反光填料的用量为水性聚氨酯涂料的总质量的5％～10％，高光乳液的用量为水性聚氨酯涂料的总质量的0.5％～5％。本发明通过水性聚氨酯涂料的组分及配比的协同作用，在提高其力学性能和耐老化性能的同时，使得水性聚氨酯涂料具有自清洁能力以及更高的太阳光反射能力，从而可以实现节能环保、美观实用、长效防水，使用寿命长，用于光伏屋面可显著提高发电效率。

Description

一种水性聚氨酯防水涂料及其制备方法及应用 技术领域
本发明属于建筑涂料领域，具体涉及一种水性聚氨酯防水涂料及其制备方法及应用。
背景技术
聚氨酯防水涂料因优异的力学性能、耐酸碱性能等成为市场上的主流防水涂料之一，但多为溶剂型涂料，气味大、环保性差，严重危害环境及人体健康。水性聚氨酯防水涂料以水作为溶剂，具有优异的性能，同时满足日益严格的绿色环保要求。
目前，诸多企业在节能环保方面有重大压力，安装光伏电站可减少碳排放量，随着风电光伏的发展，企业及家用光伏电站逐步推广，作为分布式光伏的基石，屋顶的质量好坏直接决定了分布式光伏屋顶整体系统的使用寿命和性能。尤其是屋顶对太阳光的反射率对光伏组件的发电效率有明显的影响，若能提高聚氨酯防水涂料对太阳光的反射率，将有利于提高光伏组件的发电效率。光伏组件的寿命普遍在25年，然而，目前市场上无论是金属屋面、彩钢瓦还是水泥屋顶，其防水方案都无法做到25年的寿命，加装光伏组件后，可能会加剧漏水，降低使用寿命，维修成本极高。此外，光伏屋顶的人工清洁难度较高，普通水性聚氨酯防水涂料容易附着有环境中灰尘或其他不可控的污染物，影响美观，长时间不清理可能造成污染物侵蚀涂层。
专利CN202110678125.X公开了一种优异隔热反射性能的水性聚氨酯防水涂料，其物理性能中的拉伸强度、断裂伸长率、低温柔性和不透水性均能满足JC/T 864-2008聚合物乳液建筑防水涂料的标准；太阳光反射率、近红外反射率、半球反射率、污染后太阳光反射比变化率、与参比黑板的隔热温度差的性能均满足GB/T25261-2018建筑用反射隔热涂料标准中反射隔热平涂面漆功能性的标准，但是，若用于光伏屋顶，其不具备自清洁功能，难以清理，将影响使用寿命，而且光伏屋面对防水涂料的性能要求比一般的建筑更高，其力学性能、抗老化性能及反射性能等都有待进一步提高。
发明内容
本发明的目的是提供一种具有优异的力学性能、耐老化性能、反射隔热性能，并具有自清洁功能的水性聚氨酯防水涂料。
为达到上述目的，本发明采用的技术方案是：
本发明第一方面提供一种水性聚氨酯涂料，包括水性聚氨酯分散体和无机填料，所述的水性聚氨酯涂料还包括硬脂酸盐、疏水剂、反光填料、高光乳液，所述的硬脂酸盐的用量为所述的水性聚氨酯涂料的总质量的0.5％～5％；所述的疏水剂的用量为所述的水性聚氨酯涂料 的总质量的0.1％～1％；所述的反光填料的用量为所述的水性聚氨酯涂料的总质量的5％～10％；所述的高光乳液的用量为所述的水性聚氨酯涂料的总质量的0.5％～5％。
优选地，所述的硬脂酸盐的用量为所述的水性聚氨酯涂料的总质量的0.5％～2.5％。
优选地，所述的疏水剂的用量为所述的水性聚氨酯涂料的总质量的0.1％～0.6％。
优选地，所述的反光填料的用量为所述的水性聚氨酯涂料的总质量的5％～8％。
优选地，所述的高光乳液的用量为所述的水性聚氨酯涂料的总质量的0.5％～3％。
优选地，所述的水性聚氨酯分散体为阴离子型水性聚氨酯分散体和/或非离子型水性聚氨酯分散体。
进一步地，所述的阴离子型水性聚氨酯分散体为阴离子芳香族聚醚聚氨酯分散体；所述的非离子型水性聚氨酯分散体为脂肪族聚酯聚氨酯分单体。例如万华化学集团的
Figure PCTCN2022112006-appb-000001
7351水性聚氨酯分散体或
Figure PCTCN2022112006-appb-000002
3233A水性聚氨酯分散体。
优选地，所述的水性聚氨酯分散体的用量为所述的水性聚氨酯涂料的总质量的40％～60％，进一步优选为45～55％。
优选地，所述的水性聚氨酯分散体的固含量为44～56％，粘度为10～3000mPa·s，pH值为6～9。
进一步地，所述的水性聚氨酯分散体的拉伸强度为30～45MPa，伸长率为700％～800％，100％模量为1.5～2.5MPa。
优选地，所述的高光乳液为水性聚丙烯酸酯型高光乳液。
优选地，所述的高光乳液的固含量为45～50％，粒径为0.1～0.2μm，pH值为7～9，粘度为50～450mPa·s。
优选地，所述的硬脂酸盐为硬脂酸钙、硬脂酸锌、硬脂酸钡中的一种或多种。
优选地，所述的疏水剂为聚二甲基硅氧烷水性分散体、聚乙烯蜡水性分散体、石蜡水分散体中的一种或多种。
优选地，所述的反光填料为玻璃微珠、铝粉、珠光粉中的一种或多种。
优选地，所述的反光填料的粒径为800～1500目。
优选地，所述的无机填料的用量为所述的水性聚氨酯涂料的总质量的10％～60％，进一步优选为30％～50％。
优选地，所述的无机填料为碳酸钙、硫酸钡、高岭土、钛白粉、硅灰粉、滑石粉中的一种或多种。
优选地，所述的无机填料的粒径为800～2000目。
优选地，所述的水性聚氨酯涂料还包括助剂，所述的助剂的用量为所述的水性聚氨酯涂 料的总质量的2％～10％，所述的助剂包括水、分散剂、消泡剂、成膜助剂、防腐剂、增稠剂中的一种或多种。
进一步地，所述的水、分散剂、消泡剂、成膜助剂、防腐剂、增稠剂的质量比为(3～6)∶(0.2～0.5)∶(0.2～0.5)∶(0.3～0.6)∶(0.08～0.2)∶(0.2～0.5)。
优选地，所述的分散剂为聚丙烯酸钠盐分散剂。
优选地，所述的消泡剂为有机硅消泡剂和/或矿物油消泡剂。
优选地，所述的成膜助剂为醇酯-12、己二酸二异丁酯、二丙二醇甲醚、二丙二醇丁醚中的一种或多种。
优选地，所述的防腐剂为异噻唑啉酮类防腐剂和/或苯并米唑酯类防腐剂。
和/或，所述的增稠剂为碱溶涨增稠剂和/或聚氨酯缔合型增稠剂。
本发明第二方面还提供一种所述的水性聚氨酯涂料的制备方法，将水性聚氨酯分散体、硬脂酸盐、疏水剂、无机填料、反光填料、高光乳液和助剂混合得到所述的水性聚氨酯涂料，控制混合时的搅拌速度为200～1200r/min。
优选地，所述的助剂包括水、分散剂、消泡剂、成膜助剂、防腐剂和增稠剂。
所述的制备方法具体为：
将水、硬脂酸盐、分散剂、无机填料、反光填料在搅拌速度为800～1200r/min的条件下混合形成浆料，然后将所述的浆料和水性聚氨酯乳液、高光乳液、疏水剂、消泡剂、成膜助剂、防腐剂及增稠剂在搅拌速度为200～800r/min的条件下混合得到所述的水性聚氨酯涂料。
优选地，将水、硬脂酸盐、分散剂、无机填料、反光填料在搅拌速度为800～1200r/min的条件下混合形成浆料，然后将所述的浆料和水性聚氨酯乳液、高光乳液、疏水剂、消泡剂、成膜助剂、防腐剂及增稠剂在搅拌速度为300～600r/min的条件下混合得到所述的水性聚氨酯涂料。
本发明第三方面还提供一种所述的水性聚氨酯涂料在光伏屋面中的应用。
由于上述技术方案运用，本发明与现有技术相比具有下列优点：
本发明的水性聚氨酯涂料中同时添加硬脂酸盐、疏水剂、反光填料和高光乳液，通过水性聚氨酯涂料的组分及配比的协同作用，在提高其力学性能和耐老化性能的同时，使得水性聚氨酯涂料具有自清洁能力以及更高的太阳光反射能力，从而可以实现节能环保、美观实用、长效防水，使用寿命长，用于光伏屋面可显著提高发电效率。
具体实施方式
下面将说明本发明的具体实施方案。
本发明提供一种水性聚氨酯涂料，包括水性聚氨酯分散体和无机填料，所述的水性聚氨酯涂料还包括硬脂酸盐、疏水剂、反光填料、高光乳液，所述的硬脂酸盐的用量为所述的水性聚氨酯涂料的总质量的0.5％～5％；所述的疏水剂的用量为所述的水性聚氨酯涂料的总质量的0.1％～1％；所述的反光填料的用量为所述的水性聚氨酯涂料的总质量的5％～10％；所述的高光乳液的用量为所述的水性聚氨酯涂料的总质量的0.5％～5％。
本发明的防水涂料以水性聚氨酯作为主要成膜物质，对环境和施工人员更加友好。通过同时添加硬脂酸盐、疏水剂、反光填料和高光乳液，赋予涂膜荷叶效应、高光泽度，提高其自清洁能力、太阳光反射能力；结合组分和配比的优化，同时提高其物理性能，从而达到节能减排、美观实用的效果，应用于光伏屋面可显著提高其发电效率，推动新能源产业的发展，助立“双碳”目标的达成。
根据一些实施方式，所述的水性聚氨酯分散体为阴离子型水性聚氨酯分散体和/或非离子型水性聚氨酯分散体。水性聚氨酯分散体的固含量为44～56％，粘度为10～3000mPa·s，pH值为6～9。
在实施例中，使用的水性聚氨酯乳液为万华化学集团的
Figure PCTCN2022112006-appb-000003
7351水性聚氨酯分散体。
进一步地，所述的水性聚氨酯分散体的用量为所述的水性聚氨酯涂料的总质量的40％～60％，例如45％、46％、47％、48％、49％、50％、52％、55％、58％。若所述的水性聚氨酯分散体的用量过低，则其物理性能无法满足使用需求，若所述的水性聚氨酯分散体的用量过高，则其成本较高。
根据一些实施方式，所述的高光乳液为水性聚丙烯酸酯型高光乳液，所述的高光乳液的固含量为45～55％，粒径为0.1～0.2μm，pH值为7～9，粘度为50～450mPa·s。
进一步地，所述的高光乳液的用量为所述的水性聚氨酯涂料的总质量的0.5％～5％，例如1％、1.5％、2％、2.5％、3％、3.5％。若所述的高光乳液的用量过低，对水性聚氨酯涂料的太阳光反射性能没有明显的提高；若所述的高光乳液的用量过高，成本显著上升，弹性降低。
在实施例中，使用的高光乳液为巴德富GF-B3665G通用高光面漆用乳液。
根据一些实施方式，所述的硬脂酸盐为硬脂酸钙、硬脂酸锌、硬脂酸钡中的一种或多种。
进一步地，所述的硬脂酸盐的用量为所述的水性聚氨酯涂料的总质量的0.5％～5％，例如0.5％、1％、1.5％、2％、2.5％。若所述的硬脂酸盐的用量过低，水性聚氨酯涂料的耐污性能稍低；若所述的硬脂酸盐的用量过高，成本显著上升，对其他物理性会能有一定的影响。
根据一些实施方式，所述的疏水剂为聚二甲基硅氧烷水性分散体、聚乙烯蜡水性分散体、石蜡水分散体中的一种或多种。
进一步地，疏水剂的用量为所述的水性聚氨酯涂料的总质量的0.1％～1％，例如0.1％、0.2％、0.3％、0.4％、0.5％。疏水剂与硬脂酸盐组合，若疏水剂的用量过低，水性聚氨酯涂料的耐污性能稍低；若所述的疏水剂的用量过高，成本提高。
根据一些实施方式，所述的反光填料为玻璃微珠、铝粉、珠光粉中的一种或多种。
进一步地，所述的反光填料的粒径为800～1500目。
进一步地，所述的反光填料的用量为所述的水性聚氨酯涂料的总质量的5％～10％，例如5％、5.5％、6％、6.5％、7％、7.5％、8％、8.5％、9％。若所述的反光填料的用量过低，那么水性聚氨酯涂料的太阳阳光反射性能下降；若所述的反光填料的用量过高，其弹性等将显著下降。
根据一些实施方式，所述的无机填料为碳酸钙、硫酸钡、高岭土、钛白粉、硅灰粉、滑石粉中的一种或多种。
进一步地，所述的无机填料的粒径为800～2000目。
进一步地，所述的无机填料的用量为所述的水性聚氨酯涂料的总质量的10％～60％，例如30％、31％、32％、33％、34％、35％、36％、37％、38％、40％、42％、44％、46％、48％。若所述的无机填料的用量过低，所述的水性聚氨酯涂料的成本显著上升，若所述的无机填料的用量过高，所述的水性聚氨酯涂料的弹性较差。
根据一些实施方式，所述的水性聚氨酯涂料还包括助剂，所述的助剂包括水、分散剂、消泡剂、成膜助剂、防腐剂、增稠剂中的一种或多种。
进一步地，所述的助剂的用量为所述的水性聚氨酯涂料的总质量的2％～10％，进一步优选为4％～8％。
进一步地，所述的水、分散剂、消泡剂、成膜助剂、防腐剂、增稠剂的质量比为(3～6)∶(0.2～0.5)∶(0.2～0.5)∶(0.3～0.6)∶(0.08～0.2)∶(0.2～0.5)。通过上述助剂的使用，可以降低制备难度，提高分散性，稳定性等。
进一步地，所述的分散剂为聚丙烯酸钠盐分散剂。通过采用该些优选种类的分散剂，能够进一步提高填料、硬脂酸盐等在水性聚氨酯分散体中的均匀分布，保证产品性能。
进一步地，所述的消泡剂为有机硅消泡剂和/或矿物油消泡剂。通过采用该些优选种类的消泡剂，可以与配方中的其他组分更好的配合，以进一步提高消泡效果。
进一步地，所述的成膜助剂为醇酯-12、己二酸二异丁酯、二丙二醇甲醚、二丙二醇丁醚中的一种或多种，改善乳液成膜机理，促进成膜。
进一步地，所述的防腐剂为异噻唑啉酮类防腐剂和/或苯并米唑酯类防腐剂。优选的防腐剂种类与该配方中的其他组分配合更佳，以使防腐效果更好。
进一步地，所述的增稠剂为碱溶涨增稠剂和/或聚氨酯缔合型增稠剂。优选聚氨酯缔合型增稠剂，调整产品粘度的同时改善产品流平性，促使涂膜平整光滑。
本发明的水性聚氨酯涂料的制备方法具体为：
将水、硬脂酸盐、分散剂、无机填料、反光填料在搅拌速度为800～1200r/min的条件下混合形成浆料，然后将所述的浆料和水性聚氨酯乳液、高光乳液、疏水剂、消泡剂、成膜助剂、防腐剂及增稠剂在搅拌速度为200～800r/min的条件下混合得到所述的水性聚氨酯涂料。
优选地，浆料细度在20μm以下(使用刮板细度计测试)。
优选地，在常温下进行混合操作。
本发明的水性聚氨酯涂料的制备工序简单便捷，耗时少。通过控制不同工段的搅拌速度，获得的成品细腻无气泡。
本发明中，水性聚氨酯分散体、高光乳液等的质量分时都是以分散体或乳液占终产品水性聚氨酯涂料的总质量的质量百分比。
本发明的水性聚氨酯涂料具有以下优点：
(1)以水性聚氨酯作为主要成膜物质，环保健康，同时通过与其他的组分配合，成品具有优异的力学性能、耐酸碱性能，实现长效防水。
(2)通过同时添加高光乳液、硬脂酸盐、疏水剂、反光填料，赋予涂膜荷叶效应、高光泽度，提高其自清洁能力、太阳光反射能力，达到节能减排、美观实用的效果。应用于光伏屋面可显著提高其发电效率，推动新能源产业的发展，助立“双碳”目标的达成。
下面结合具体实施例对本发明的技术方案作进一步的描述，但本发明不应限于这些实施例，除非特别叙述，均可被其他等效或具有类似目的的替代特征加以替换。除非特别叙述，每个特征只是一系列等效或类似特征中一个例子而已。本说明书中公开了所有特征，或公开的所有方法或过程中的步骤，除了相互排斥的特征或步骤以外，均可以以任何方式组合。在本发明中所使用的术语，除非另有说明，一般具有本领域普通技术人员通常理解的含义。
以下实施例中，除另有说明的，使用的物质均可通过市售获得。
以下实施例中，水性聚氨酯分散体为
Figure PCTCN2022112006-appb-000004
7351水性聚氨酯分散体；高光乳液为巴德富GF-B3665G乳液；聚二甲基硅氧烷水性分散体为道康宁DC51；聚丙烯酸钠盐分散剂为陶氏731A；消泡剂为陶氏化学731A；增稠剂为陶氏RM-2020。
实施例1～3及对比例1～4的配方及用量见表1。制备方法：先将水、硬脂酸钙、聚丙烯酸钠盐分散剂、无机填料硫酸钡和钛白粉、反光填料玻璃微珠在搅拌速度为1000/min的条件下混合形成浆料(使用刮板细度计测试浆料细度低于20μm)，然后将所述的浆料和水性聚氨酯乳液、高光乳液、聚二甲基硅氧烷水性分散体、消泡剂、成膜助剂、防腐剂及增稠剂在 搅拌速度为500r/min的条件下混合得到实施例1～3及对比例1～4的水性聚氨酯涂料。
表1
Figure PCTCN2022112006-appb-000005
实施例1～3及对比例1～4的制得的水性聚氨酯涂料按JC/T 864-2008《聚合物乳液建筑防水涂料》中II型指标、GB/T31815-2015《建筑外表面用自清洁涂料》中产品的自清洁特性、GB/T25261-2018《建筑用反射隔热涂料》中反射隔热平涂面漆的功能性指标进行测试，测试结果见表2。
表2性能测试结果
Figure PCTCN2022112006-appb-000006
Figure PCTCN2022112006-appb-000007
通过表2性能测试结果可知：
实施例1～3所得具有自清洁功能的水性聚氨酯防水涂料具有优异的力学性能、耐酸碱性能及耐人工气候老化性能，能够有效解决建筑渗漏痛点，实现长效防水；涂膜具有优异的自清洁能力及隔热保温功能，满足节能减排、美观实用的需求。应用于光伏屋面，较高的太阳光反射比能够提高光伏系统对反射光的吸收率，进而提高发电效率。
硬脂酸钙、聚二甲基硅氧烷水性分散体、巴德富GF-B3665G乳液的加入能够降低涂膜表面能，提高光泽度，杂质不易附着在表面，实现自清洁功能，同时，进一步提高涂膜反光隔热能力。
实施例2相比实施例1小幅度降低了
Figure PCTCN2022112006-appb-000008
7351水性聚氨酯分散体的比例，涂膜力学性能轻微下降，但仍满足标准要求。
实施例3相比实施例1适度提高硬脂酸钙、聚二甲基硅氧烷水性分散体、巴德富GF-B3665G乳液的比例，进一步降低涂膜表面能、提高光泽度，赋予涂膜更高的自清洁能力及反光隔热能力。
对比例1相比实施例1未使用硬脂酸钙、聚二甲基硅氧烷水性分散体和巴德富GF-B3665G乳液，涂膜表面能较高、光泽度较低，杂质容易附着在表面，不符合自清洁特性要求，同时，反光隔热能力明显下降。
对比例2相比实施例3未使用聚二甲基硅氧烷水性分散体，虽然适度提高了硬脂酸钙的用量，但自清洁特性还是显著下降。
对比例3相比实施例3未使用巴德富GF-B3665G乳液，适度提高了聚二甲基硅氧烷水性分散体、硬脂酸钙的用量，反光隔热能力明显下降，同时拉伸强度也出现下降。
对比例4相比实施例3未使用硬脂酸钙，适度提高了聚二甲基硅氧烷水性分散体、巴德富GF-B3665G乳液的用量，涂膜自清洁特性、断裂延伸率显著下降。
上述实施例只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施，并不能以此限制本发明的保护范围。凡根据本发明精神实质所作的等效变化或修饰，都应涵盖在本发明的保护范围之内。

Claims (10)

  1. 一种水性聚氨酯涂料，包括水性聚氨酯分散体和无机填料，其特征在于，所述的水性聚氨酯涂料还包括硬脂酸盐、疏水剂、反光填料、高光乳液，所述的硬脂酸盐的用量为所述的水性聚氨酯涂料的总质量的0.5％～5％；所述的疏水剂的用量为所述的水性聚氨酯涂料的总质量的0.1％～1％；所述的反光填料的用量为所述的水性聚氨酯涂料的总质量的5％～10％；所述的高光乳液的用量为所述的水性聚氨酯涂料的总质量的0.5％～5％。
  2. 根据权利要求1所述的水性聚氨酯涂料，其特征在于，所述的水性聚氨酯分散体为阴离子型水性聚氨酯分散体和/或非离子型水性聚氨酯分散体；
    和/或，所述的水性聚氨酯分散体的用量为所述的水性聚氨酯涂料的总质量的40％～60％；
    和/或，所述的水性聚氨酯分散体的固含量为44～56％，粘度为10～3000mPa·s，pH值为6～9。
  3. 根据权利要求1所述的水性聚氨酯涂料，其特征在于，所述的高光乳液为水性聚丙烯酸酯型高光乳液；
    和/或，所述的高光乳液的固含量为45～55％，粒径为0.1～0.2μm，pH值为7～9，粘度为50～450mPa·s。
  4. 根据权利要求1所述的水性聚氨酯涂料，其特征在于，所述的硬脂酸盐为硬脂酸钙、硬脂酸锌、硬脂酸钡中的一种或多种；
    和/或，所述的疏水剂为聚二甲基硅氧烷水性分散体、聚乙烯蜡水性分散体、石蜡水分散体中的一种或多种；
    和/或，所述的反光填料为玻璃微珠、铝粉、珠光粉中的一种或多种；
    和/或，所述的反光填料的粒径为800～1500目。
  5. 根据权利要求1所述的水性聚氨酯涂料，其特征在于，
    所述的无机填料的用量为所述的水性聚氨酯涂料的总质量的10％～60％；
    和/或，所述的无机填料为碳酸钙、硫酸钡、高岭土、钛白粉、硅灰粉、滑石粉中的一种或多种；
    和/或，所述的无机填料的粒径为800～2000目。
  6. 根据权利要求1所述的水性聚氨酯涂料，其特征在于，所述的水性聚氨酯涂料还包括助剂，所述的助剂的用量为所述的水性聚氨酯涂料的总质量的2％～10％，所述的助剂包括水、分散剂、消泡剂、成膜助剂、防腐剂、增稠剂中的一种或多种。
  7. 根据权利要求6所述的水性聚氨酯涂料，其特征在于，所述的水、分散剂、消泡剂、成膜助剂、防腐剂、增稠剂的质量比为(3～6)∶(0.2～0.5)∶(0.2～0.5)∶(0.3～0.6)∶(0.08～0.2)∶(0.2～0.5)。
    和/或，所述的分散剂为聚丙烯酸钠盐分散剂；
    和/或，所述的消泡剂为有机硅消泡剂和/或矿物油消泡剂；
    和/或，所述的成膜助剂为醇酯-12、己二酸二异丁酯、二丙二醇甲醚、二丙二醇丁醚中的一种或多种；
    和/或，所述的防腐剂为异噻唑啉酮类防腐剂和/或苯并米唑酯类防腐剂；
    和/或，所述的增稠剂为碱溶涨增稠剂和/或聚氨酯缔合型增稠剂。
  8. 一种如权利要求1至7中任一项所述的水性聚氨酯涂料的制备方法，其特征在于，将水性聚氨酯分散体、硬脂酸盐、疏水剂、无机填料、反光填料、高光乳液和助剂混合得到所述的水性聚氨酯涂料，控制混合时的搅拌速度为200～1200r/min。
  9. 根据权利要求8所述的制备方法，其特征在于，所述的助剂包括水、分散剂、消泡剂、成膜助剂、防腐剂和增稠剂，
    所述的制备方法具体为：
    将水、硬脂酸盐、分散剂、无机填料、反光填料在搅拌速度为800～1200r/min的条件下混合形成浆料，然后将所述的浆料和水性聚氨酯乳液、高光乳液、疏水剂、消泡剂、成膜助剂、防腐剂及增稠剂在搅拌速度为200～800r/min的条件下混合得到所述的水性聚氨酯涂料。
  10. 一种如权利要求1～7中任一项所述的水性聚氨酯涂料在光伏屋面中的应用。
PCT/CN2022/112006 2021-11-11 2022-08-12 一种水性聚氨酯防水涂料及其制备方法及应用 WO2023082740A1 (zh)

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