CN116082940A - Exposed water-based polyurethane waterproof coating and preparation method and construction method thereof - Google Patents

Exposed water-based polyurethane waterproof coating and preparation method and construction method thereof Download PDF

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CN116082940A
CN116082940A CN202211710882.1A CN202211710882A CN116082940A CN 116082940 A CN116082940 A CN 116082940A CN 202211710882 A CN202211710882 A CN 202211710882A CN 116082940 A CN116082940 A CN 116082940A
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parts
shell powder
water
agent
exposed
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李慧
张文龙
郭豪东
刘威
潘喜良
付绍祥
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Henan Sankeshu New Material Technology Co ltd
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Henan Sankeshu New Material Technology Co ltd
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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
    • C09D5/18—Fireproof paints including high temperature resistant 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
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster
    • E04F13/04—Bases for plaster
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster
    • E04F13/04—Bases for plaster
    • E04F13/047—Plaster carrying meshes
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant

Abstract

The invention relates to an exposed water-based polyurethane waterproof coating, a preparation method and a construction method thereof, wherein the coating comprises the following components in parts by mass: 350-500 parts of aqueous polyurethane dispersoid, 0.5-2 parts of hydroxyethyl cellulose, 5-15 parts of dispersing agent, 4-7 parts of defoaming agent, 0.3-1 part of pH regulator, 10-50 parts of rutile type titanium dioxide and 300-450 parts of filler4-10 parts of film forming auxiliary agent, 1-3 parts of preservative, 0.3-2 parts of polyurethane thickener, 90-110 parts of deionized water, 10-20 parts of modified shell powder, 10-50 parts of light heat insulation material and 10-50 parts of flame retardant; the modified shell powder is obtained by modifying shell powder by 5-10% of HCl and 5-10% of HF. The invention forms CaF on the surface by introducing acid modified shell powder 2 The acid and alkali resistant insoluble shell improves the weather resistance and acid and alkali resistance of the coating; meanwhile, the water-based polyurethane dispersoid and the surface hydroxyl of the modified shell powder can form a hydrogen bond, so that a high-strength reticular crosslinking system is formed, and the stability of the coating is greatly improved; in addition, the heat insulation property of the coating is improved based on the porous property of the modified shell powder.

Description

Exposed water-based polyurethane waterproof coating and preparation method and construction method thereof
Technical Field
The invention relates to the technical field of building waterproof coatings, in particular to an exposed water-based polyurethane waterproof coating and a preparation and construction method thereof.
Background
Along with the development of building waterproof technology becoming more mature, people are also more and more accepted in building waterproofing. Some building roofs can be subjected to waterproof construction in the building process, but the problem of waterproof failure maintenance can be related due to the prolonged service life; some building roofs do not take waterproof measures and can cause leakage. The waterproof coating has the advantages of good integrity, convenient construction and the like, and is widely applied to the waterproof, seepage-proof and moistureproof treatment of buildings.
Polyurethane is an important component of the waterproof coating market due to its excellent waterproof properties. However, the traditional polyurethane has some defects, namely most of the existing oil polyurethane waterproof paint has solvent volatilization in the use process, is harmful to human bodies and the environment and is not environment-friendly; secondly, the traditional polyurethane waterproof paint has poor weather resistance and poor effect when used as an exposed waterproof paint; thirdly, the traditional polyurethane waterproof paint does not have heat preservation and insulation effects, and energy conservation of buildings cannot be realized; fourth, the construction method of the traditional polyurethane waterproof paint often has the problem that the base layer is not firmly adhered to cause the large-area falling of the coating film, and the durability is poor.
Chinese patent CN113717624A discloses an environment-friendly water-based polyurethane waterproof paint and a manufacturing method thereof, does not contain an organic solvent, has excellent mechanical property, low-temperature property and lower water absorption, but does not have heat preservation and insulation properties, and does not relate to the problem of the adhesive strength of a coating film after construction. Therefore, how to improve the weather resistance, the environmental protection, the heat insulation, the durability and the mechanical properties of the exposed polyurethane waterproof coating is a technical problem to be solved urgently.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention provides the exposed water-based polyurethane waterproof paint, the preparation method and the construction method thereof, and the prepared paint has good weather resistance, environmental protection, long-acting, good heat insulation effect, good bonding strength with a base layer after construction and can avoid zero extension fracture.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the invention provides an exposed water-based polyurethane waterproof coating, which comprises the following components in parts by mass:
350-500 parts of aqueous polyurethane dispersoid, 0.5-2 parts of hydroxyethyl cellulose, 5-15 parts of dispersing agent, 4-7 parts of defoaming agent, 0.3-1 part of pH regulator, 10-50 parts of rutile type titanium dioxide, 300-450 parts of filler, 4-10 parts of film forming additive, 1-3 parts of preservative, 0.3-2 parts of polyurethane thickener, 90-110 parts of deionized water, 10-20 parts of modified shell powder, 10-50 parts of light heat insulation material and 10-50 parts of flame retardant;
the modified shell powder is obtained by modifying shell powder by 5-10% of HCl and 5-10% of HF.
The invention provides an exposed water-based polyurethane waterproof coating, modified shell powder obtained by HCl and HF treatment is introduced into the coating, and CaF is formed on the surface of the coating 2 The acid-resistant and alkali-resistant insoluble shell improves the weather resistance and acid-resistant and alkali-resistant performance of the coating, and meanwhile, the water-based polyurethane dispersoid and the surface hydroxyl of the modified shell powder can form hydrogen bonds to form a high-strength reticular crosslinking system, so that the stability of the coating is greatly improved, and in addition, the reflectivity and the heat insulation performance of the coating are improved due to the introduction of the modified shell powder based on the porous characteristic of the modified shell powder.The exposed aqueous polyurethane waterproof coating prepared by the invention has the characteristics of excellent weather resistance, low-temperature flexibility, low VOC, flame retardance, heat insulation, tensile strength and the like by taking the aqueous polyurethane dispersoid as a main film forming substance and adding the filler and other auxiliary agents for preparation, and can solve the problems of large-area falling and cracking by matching with a certain construction method.
Optionally, the light thermal insulation material is selected from one or more of POM powder, polyoxymethylene linear thermoplastic resin, glass fiber reinforced POM, glass sphere POM and carbon fiber POM.
From the above description, it is known that the POM material has the characteristics of light weight, heat insulation, abrasion resistance, excellent electrical insulation, etc., and is introduced to be capable of improving the aging resistance and the reflective insulation of the coating.
Optionally, the flame retardant is compounded by decabromodiphenyl ethane and antimony trioxide according to a mass ratio of 1:3.
According to the above description, the combination of decabromodiphenyl ethane and antimony trioxide can not only effectively improve the flame retardant property of the paint, but also improve the solar reflectance property of the paint due to the higher solar emissivity of the decabromodiphenyl ethane and the antimony trioxide.
Optionally, the dispersant is selected from one or more of polyacrylate, polyphosphate, polycarboxylate, cellulose derivative, fatty acid polyglycol ester, sodium dodecyl sulfate;
the pH regulator is selected from one or more of ammonia water, dimethylethanolamine, 2-amino-2-methyl-1-propanol and triethanolamine;
the defoamer is one or more selected from polydimethylsiloxane, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene alcohol amine ether and polyoxypropylene polyoxyethylene glycerol ether;
the filler is one or more selected from quartz powder, wollastonite powder, calcium carbonate, titanium dioxide, barium sulfate and metakaolin;
the film forming auxiliary agent is alcohol ester twelve;
the preservative is selected from one or more of octyl-isothiazolinone, bisbenzamide, benzimidazole carbamate and ethylene bis-dithiocarbamic acid ammonium;
the polyurethane thickener is selected from one or more of hydrophobic group modified ethoxypolyurethane polymer, polyurethane associative polymer, carbamate, polyoxyethylene and derivatives thereof.
In a second aspect, the invention provides a preparation method of an exposed water-based polyurethane waterproof coating, which comprises the following steps:
s1, adding hydroxyethyl cellulose, a pH regulator and an antifoaming agent into deionized water, and stirring under the condition of 500-1000 r/min.
S2, continuously adding the aqueous polyurethane dispersion and the dispersing agent and stirring.
S3, the rotating speed is increased to 1100-1300r/min, and rutile type titanium dioxide, modified shell powder, flame retardant, light heat insulation material and filler are slowly added for stirring.
S4, reducing the rotating speed to 500-700r/min, continuously adding the film forming auxiliary agent, the preservative and the polyurethane thickener, and uniformly stirring.
The preparation method of the modified shell powder comprises the following steps:
a1, treating shell powder with 5-10% HCl solution, and further treating with 5-10% HF solution.
As is clear from the above description, the HCl soaking treatment aims at separating out part of Ca in shell powder 2+ The paint is lighter and has lower density, and further treatment of HF can be combined with Ca 2+ Acting to form CaF on shell powder surface 2 Acid and alkali resistant insoluble shell, and improved weather resistance and stability of the paint.
And A2, drying the shell powder obtained by acid solution treatment at 100 ℃, and sieving the shell powder by a 1200-mesh sieve.
In a third aspect, the invention provides a construction method of an exposed water-based polyurethane waterproof coating, which comprises the following steps: a1, cleaning a base layer; a2, constructing and reinforcing a rigid waterproof layer; a3, performing gap reinforcement treatment; a4, large-surface construction.
Optionally, the base layer cleaning specifically includes: firstly, loosening a base layer, removing dirt and projections, and then quickly repairing the base layer by using a plugging king;
from the above description, it is known that the cleaning and repairing treatment of the base layer before the paint application can make the base layer flat and firm.
The construction and reinforcement of the rigid waterproof layer are specifically as follows: the rigid waterproof layer is constructed once by waterproof paint meeting the JCT2090-2011I type standard requirement, and the base layer is reinforced;
according to the description, the rigid waterproof paint has high bonding strength and high impermeability, can strengthen a base layer after construction, and plays a certain role in waterproof. The construction method adopting the non-exposed rigid waterproof coating as an inner layer and the exposed water-based polyurethane waterproof coating as an outer layer not only plays roles of indirectly reinforcing a base layer, improving the thickness of a waterproof layer and increasing the durability of a system, but also reduces the consumption of the exposed water-based polyurethane waterproof coating and reduces the construction cost.
The gap strengthening treatment specifically comprises the following steps: nylon mesh cloth with the width of 100mm and the pitch of 3mm is used as a reinforcing layer at the position where the base layer is easy to generate cracks and at the two sides of the separation seams, the center of the mesh cloth is ensured to be positioned at the positions where the cracks, the prepared exposed water-based polyurethane waterproof paint is used for 2 times of painting until the mesh cloth is completely wrapped, and the next construction can be carried out after the mesh cloth is completely dried;
according to the description, the nylon mesh cloth with the 3mm hole distance is selected, so that the reinforcing effect is not weakened due to the fact that the hole distance is too large, the contact area of a coating film and the nylon mesh cloth is not too large due to the fact that the hole distance is too close, the phenomenon that the coating film and the nylon mesh cloth are broken at the same time is avoided, and the extensibility is reduced; meanwhile, the soft nylon mesh cloth is added, so that the coating construction is adhered, and the situation that the mesh cloth is exposed or the coating at the concave part is too thick due to uneven base layer is avoided.
The large-surface construction is specifically as follows: firstly, coating a water-based epoxy interface agent on the large surface except the gap reinforcing layer, and after the water-based epoxy interface agent is completely dried, carrying out large-surface construction by using the prepared exposed water-based polyurethane waterproof paint, and coating for 2-3 times to ensure that the thickness reaches 1.8mm, wherein the construction direction between two adjacent times is vertical.
Optionally, the aqueous epoxy interface agent comprises a component A and a component B according to a mass ratio of 1:1, uniformly mixing and using, wherein the component A comprises the following components in parts by mass: 250-300 parts of epoxy dispersoid, 6-10 parts of film forming additive, 5-9 parts of wetting agent, 0.5-3 parts of defoamer and 500-740 parts of deionized water; the component B comprises the following components in parts by mass: 280-300 parts of curing agent, 0.5-3 parts of defoaming agent and 650-750 parts of deionized water.
As is clear from the above description, the aqueous epoxy interface agent can make the adhesion between the configured exposed aqueous polyurethane waterproof coating and the base layer stronger, and therefore, the coating is not applicable to the gap, otherwise, the zero extension fracture of the waterproof coating film is caused along with the generation of the crack or the movement of the separation seam, and if the waterproof coating film slightly hollows at the separation seam, the effect of resisting the zero extension fracture can be achieved.
The invention adopts a partition construction method of firstly detail and then large surface, and improves the bonding strength of weak links on the large surface by increasing the bonding strength on the conventional base layer and performing low bonding treatment on the easy-to-crack part, and simultaneously reduces the bonding strength of the easy-to-crack part or the separation joint part and increases the coating area for resisting crack expansion, thereby improving the stability and durability after construction.
Wherein, the technical effects corresponding to the components of the preparation method of the exposed water-based polyurethane waterproof coating provided in the second aspect and the construction method of the exposed water-based polyurethane waterproof coating provided in the third aspect are described with reference to the related description of the exposed water-based polyurethane waterproof coating provided in the first aspect.
Drawings
FIG. 1 is a construction structure diagram of a parting joint according to an embodiment of the present invention;
fig. 2 is a construction block diagram of a large-scale construction according to an embodiment of the present invention.
Detailed Description
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the invention provides an exposed water-based polyurethane waterproof coating, which comprises the following components in parts by mass:
350-500 parts of aqueous polyurethane dispersoid, 0.5-2 parts of hydroxyethyl cellulose, 5-15 parts of dispersing agent, 4-7 parts of defoaming agent, 0.3-1 part of pH regulator, 10-50 parts of rutile type titanium dioxide, 300-450 parts of filler, 4-10 parts of film forming additive, 1-3 parts of preservative, 0.3-2 parts of polyurethane thickener, 90-110 parts of deionized water, 10-20 parts of modified shell powder, 10-50 parts of light heat insulation material and 10-50 parts of flame retardant;
the modified shell powder is obtained by modifying shell powder by 5-10% of HCl and 5-10% of HF.
Preferably, the aqueous polyurethane dispersion is of the type Wanhua
Figure BDA0004026191580000061
The HCl and HF concentrations were 5%.
The light heat insulating material is one or more selected from POM powder, polyoxymethylene linear thermoplastic resin, glass fiber reinforced POM, glass ball POM and carbon fiber POM.
Preferably, the light heat insulating material is POM powder.
The flame retardant is compounded by decabromodiphenyl ethane and antimonous oxide according to the mass ratio of 1:3.
The dispersing agent is one or more selected from polyacrylate, polyphosphate, polycarboxylate, cellulose derivative, fatty acid polyethylene glycol ester and sodium dodecyl sulfate.
Preferably, the dispersant is sodium polyacrylate.
The pH regulator is one or more selected from ammonia water, dimethylethanolamine, 2-amino-2-methyl-1-propanol and triethanolamine.
Preferably, the pH adjuster is triethanolamine.
The defoamer is one or more selected from polydimethylsiloxane, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene alcohol amine ether and polyoxypropylene polyoxyethylene glycerol ether.
Preferably, the defoamer is polyoxypropylene polyoxyethylene glyceryl ether.
The filler is selected from quartz powder, wollastonite powder, calcium carbonate, titanium pigment, barium sulfate and higher
One or more of the kaolins.
Preferably, the filler is 1250 mesh barium sulfate.
The film forming auxiliary agent is alcohol ester twelve.
The preservative is selected from one or more of octyl-isothiazolinone, bisbenzamide, benzimidazole carbamate and ethylene bis-dithiocarbamic acid ammonium.
Preferably, the preservative is octyl-isothiazolinone.
The polyurethane thickener is selected from one or more of hydrophobic group modified ethoxypolyurethane polymer, polyurethane associative polymer, carbamate, polyoxyethylene and derivatives thereof.
Preferably, the polyurethane thickener is a polyurethane associative polymer.
It is prepared by the following method, comprising the following steps:
s1, adding hydroxyethyl cellulose, a pH regulator and an antifoaming agent into deionized water, and stirring under the condition of 500-1000 r/min.
Preferably, the stirring speed is set to 600r/min.
S2, continuously adding the aqueous polyurethane dispersion and the dispersing agent and stirring.
S3, the rotating speed is increased to 1100-1300r/min, and rutile type titanium dioxide, modified shell powder, flame retardant, light heat insulation material and filler are slowly added for stirring.
Preferably, the stirring speed is set to 1200r/min.
S4, reducing the rotating speed to 500-700r/min, continuously adding the film forming auxiliary agent, the preservative and the polyurethane thickener, and uniformly stirring.
Preferably, the stirring speed is set to 600r/min.
The preparation method of the modified shell powder comprises the following steps:
a1, treating shell powder with 5% HCl solution, and further treating the shell powder with 5% HF solution.
And A2, drying the shell powder obtained by acid solution treatment at 100 ℃, and sieving the shell powder by a 1200-mesh sieve.
The construction method comprises the following steps: a1, cleaning a base layer; a2, constructing and reinforcing a rigid waterproof layer; a3, performing gap reinforcement treatment; a4, large-surface construction.
The base layer cleaning specifically comprises the following steps: firstly, loosening a base layer, removing dirt and projections, and then quickly repairing the base layer by using a plugging king;
the construction and reinforcement of the rigid waterproof layer are specifically as follows: the rigid waterproof layer is constructed once by waterproof paint meeting the JCT2090-2011I type standard requirement, and the base layer is reinforced;
the gap strengthening treatment specifically comprises the following steps: nylon mesh cloth with the width of 100mm and the pitch of 3mm is used as a reinforcing layer at the position where the base layer is easy to generate cracks and at the two sides of the separation seams, the center of the mesh cloth is ensured to be positioned at the positions where the cracks, the prepared exposed water-based polyurethane waterproof paint is used for 2 times of painting until the mesh cloth is completely wrapped, and the next construction can be carried out after the mesh cloth is completely dried;
the large-surface construction is specifically as follows: firstly, coating a water-based epoxy interface agent on the large surface except the gap reinforcing layer, and after the water-based epoxy interface agent is completely dried, carrying out large-surface construction by using the prepared exposed water-based polyurethane waterproof paint, and coating for 2-3 times to ensure that the thickness reaches 1.8mm, wherein the construction direction between two adjacent times is vertical.
Wherein, the aqueous epoxy interface agent consists of a component A and a component B according to the mass ratio of 1:1, uniformly mixing and using, wherein the component A comprises the following components in parts by mass: 250-300 parts of epoxy dispersoid, 6-10 parts of film forming additive, 5-9 parts of wetting agent, 0.5-3 parts of defoamer and 500-740 parts of deionized water; the component B comprises the following components in parts by mass: 280-300 parts of curing agent, 0.5-3 parts of defoaming agent and 650-750 parts of deionized water.
Preferably, the epoxy dispersion is of the Wanhua type
Figure BDA0004026191580000081
The wetting agent is polyoxyethylene alkylphenol ether wetting agent; the defoaming agent is an organosilicon defoaming agent; the solidifying agent adopts Wanhua ∈ ->
Figure BDA0004026191580000082
Example 1
The exposed water-based polyurethane waterproof paint comprises the following components in parts by mass:
500 parts of aqueous polyurethane dispersoid, 1 part of hydroxyethyl cellulose, 5 parts of sodium polyacrylate, 5 parts of polyoxypropylene polyoxyethylene glyceryl ether, 1 part of triethanolamine, 30 parts of rutile type titanium dioxide, 300 parts of 1250-mesh barium sulfate, 10 parts of alcohol ester, 1 part of octyl-isothiazolinone, 2 parts of polyurethane associated polymer, 100 parts of deionized water, 10 parts of modified shell powder, 10 parts of POM powder and 40 parts of flame retardant;
the modified shell powder is obtained by modifying shell powder by 5% of HCl and 5% of HF.
The flame retardant is compounded by decabromodiphenyl ethane and antimonous oxide according to the mass ratio of 1:3.
It is prepared by the following method, comprising the following steps:
s1, adding hydroxyethyl cellulose, triethanolamine and polyoxypropylene polyoxyethylene glycerol ether into deionized water, and stirring under the condition of 600r/min.
S2, continuously adding the aqueous polyurethane dispersion and sodium polyacrylate and stirring.
S3, the rotating speed is increased to 1200r/min, and rutile type titanium dioxide, modified shell powder, flame retardant, POM powder and 1250-mesh barium sulfate are slowly added for stirring.
S4, reducing the rotating speed to 600r/min, continuously adding alcohol ester twelve, octyl-isothiazolinone and polyurethane associated polymer, and uniformly stirring.
The preparation method of the modified shell powder comprises the following steps:
a1, treating shell powder with 5% HCl solution, and further treating the shell powder with 5% HF solution.
And A2, drying the shell powder obtained by acid solution treatment at 100 ℃, and sieving the shell powder by a 1200-mesh sieve.
The construction method comprises the following steps: a1, cleaning a base layer; a2, constructing and reinforcing a rigid waterproof layer; a3, performing gap reinforcement treatment; a4, large-surface construction.
The base layer cleaning specifically comprises the following steps: firstly, the base layer is loosened, dirt and projections are removed, and then the base layer is quickly repaired by using the plugging king.
The construction and reinforcement of the rigid waterproof layer are specifically as follows: the rigid waterproof layer is constructed once by waterproof paint meeting the requirements of JCT2090-2011I type standard, and the base layer is reinforced.
As shown in fig. 1, the gap strengthening process specifically includes: nylon mesh cloth with the width of 100mm and the pitch of 3mm is used as a reinforcing layer at the position where the base layer is easy to generate cracks and at the two sides of the separation seams, the center of the mesh cloth is ensured to be positioned at the positions of the gaps, the prepared exposed water-based polyurethane waterproof paint is used for 2 times of brushing until the mesh cloth is completely wrapped, and the next construction can be carried out after the mesh cloth is completely dried.
As shown in fig. 2, the large-surface construction specifically includes: firstly, coating a water-based epoxy interface agent on the large surface except for the gap reinforcing layer, and after the water-based epoxy interface agent is completely dried, carrying out large-surface construction by using the prepared exposed water-based polyurethane waterproof paint, and coating for 2-3 times to ensure that the thickness reaches 1.8mm, wherein the construction direction between two adjacent times is vertical;
wherein, the aqueous epoxy interface agent consists of a component A and a component B according to the mass ratio of 1:1, uniformly mixing and using, wherein the component A comprises the following components in parts by mass: 300 parts of epoxy dispersion, 10 parts of film forming additive, 8 parts of polyoxyethylene alkylphenol ether, 3 parts of organosilicon defoamer and 679 parts of deionized water; the component B comprises the following components in parts by mass: 300 parts of curing agent, 3 parts of organosilicon defoamer and 697 parts of deionized water.
Example 2
This example differs from example 1 in the amount of each component added.
The exposed water-based polyurethane waterproof paint comprises the following components in parts by mass:
500 parts of aqueous polyurethane dispersion, 1 part of hydroxyethyl cellulose, 5 parts of sodium polyacrylate, 5 parts of polyoxypropylene polyoxyethylene glyceryl ether, 1 part of triethanolamine, 30 parts of rutile type titanium dioxide, 300 parts of 1250-mesh barium sulfate, 10 parts of alcohol ester, 1 part of octyl-isothiazolinone, 2 parts of polyurethane associated polymer, 100 parts of deionized water, 20 parts of modified shell powder, 30 parts of POM powder and 40 parts of flame retardant.
Comparative example 1
The difference between this comparative example and example 1 is that no modified shell powder was included, and the specific raw material formulation was adjusted as follows:
the exposed water-based polyurethane waterproof paint comprises the following components in parts by mass:
500 parts of aqueous polyurethane dispersion, 1 part of hydroxyethyl cellulose, 5 parts of sodium polyacrylate, 5 parts of polyoxypropylene polyoxyethylene glyceryl ether, 1 part of triethanolamine, 30 parts of rutile type titanium dioxide, 300 parts of 1250-mesh barium sulfate, 10 parts of alcohol ester, 1 part of octyl-isothiazolinone, 2 parts of polyurethane associated polymer, 100 parts of deionized water, 10 parts of POM powder and 20 parts of flame retardant.
Comparative example 2
The difference between this comparative example and example 1 is that no POM powder was included, and the specific raw material formulation was adjusted as follows:
the exposed water-based polyurethane waterproof paint comprises the following components in parts by mass:
500 parts of aqueous polyurethane dispersion, 1 part of hydroxyethyl cellulose, 5 parts of sodium polyacrylate, 5 parts of polyoxypropylene polyoxyethylene glyceryl ether, 1 part of triethanolamine, 30 parts of rutile type titanium dioxide, 300 parts of 1250-mesh barium sulfate, 10 parts of alcohol ester, 1 part of octyl-isothiazolinone, 2 parts of polyurethane associated polymer, 100 parts of deionized water, 10 parts of modified shell powder and 20 parts of flame retardant.
Comparative example 3
The comparative example differs from example 1 in that no flame retardant was included, and the specific raw material formulation was adjusted as follows:
the exposed water-based polyurethane waterproof paint comprises the following components in parts by mass:
500 parts of aqueous polyurethane dispersion, 1 part of hydroxyethyl cellulose, 5 parts of sodium polyacrylate, 5 parts of polyoxypropylene polyoxyethylene glyceryl ether, 1 part of triethanolamine, 30 parts of rutile type titanium dioxide, 300 parts of 1250-mesh barium sulfate, 10 parts of alcohol ester, 1 part of octyl-isothiazolinone, 2 parts of polyurethane associated polymer, 100 parts of deionized water, 10 parts of modified shell powder and 10 parts of POM.
The waterproof coatings prepared in examples 1-2 and comparative examples 1-3 were subjected to various performance tests according to standard test methods, and the results are shown in tables 1-3 below.
TABLE 1 mechanical Property test results of waterproof coating
Figure BDA0004026191580000111
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Figure BDA0004026191580000121
As can be seen from Table 1, each index of examples 1 and 2 meets the test standard, and the aqueous polyurethane waterproof coating prepared by the invention has excellent performances such as weather resistance, mechanical property, low-temperature flexibility, reflective heat insulation effect and the like, and is very suitable for exposed waterproof scenes. Compared with the examples, the solar reflectance, hemispherical emissivity and surface temperature difference of the comparative example 1 without modified shell powder and the comparative example 2 without POM powder do not reach standard values; comparative example 3, to which no flame retardant was added, was inferior in combustion performance as well as not only the foregoing index was not in accordance with the standard value.
TABLE 2 post-construction Performance test results of waterproof coating
Figure BDA0004026191580000131
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As can be seen from the results of table 2, the use of the aqueous epoxy interface agent can enhance the adhesive strength of the waterproof coating to the base layer; the addition of the mesh cloth can reduce the elongation at break, enhance the crack resistance of the coating film, and effectively improve the waterproof effect and durability of the coating after construction.
TABLE 3 test results of harmful substance content of waterproof coating
Figure BDA0004026191580000132
The data in Table 3 show that the exposed water-based polyurethane waterproof paint prepared according to the invention has low VOC content and can meet the A-type standard requirement.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (8)

1. The exposed water-based polyurethane waterproof paint comprises the following components in parts by mass:
350-500 parts of aqueous polyurethane dispersoid, 0.5-2 parts of hydroxyethyl cellulose, 5-15 parts of dispersing agent, 4-7 parts of defoaming agent, 0.3-1 part of pH regulator, 10-50 parts of rutile type titanium dioxide, 300-450 parts of filler, 4-10 parts of film forming additive, 1-3 parts of preservative, 0.3-2 parts of polyurethane thickener, 90-110 parts of deionized water, 10-20 parts of modified shell powder, 10-50 parts of light heat insulation material and 10-50 parts of flame retardant;
the modified shell powder is obtained by modifying shell powder by 5-10% of HCl and 5-10% of HF.
2. The exposed aqueous polyurethane waterproof coating material according to claim 1, wherein the light heat insulating material is selected from one or more of POM powder, polyoxymethylene linear thermoplastic resin, glass fiber reinforced POM, glass sphere POM, and carbon fiber POM.
3. The exposed aqueous polyurethane waterproof coating material according to claim 1, wherein the flame retardant is compounded by decabromodiphenyl ethane and antimony trioxide according to a mass ratio of 1:3.
4. The exposed aqueous polyurethane waterproof coating material according to claim 1, wherein the dispersing agent is one or more selected from the group consisting of polyacrylate, polyphosphate, polycarboxylate, cellulose derivative, fatty acid polyglycol ester, and sodium dodecyl sulfate;
the pH regulator is selected from one or more of ammonia water, dimethylethanolamine, 2-amino-2-methyl-1-propanol and triethanolamine;
the defoamer is one or more selected from polydimethylsiloxane, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene alcohol amine ether and polyoxypropylene polyoxyethylene glycerol ether;
the filler is one or more selected from quartz powder, wollastonite powder, calcium carbonate, titanium dioxide, barium sulfate and metakaolin;
the film forming auxiliary agent is alcohol ester twelve;
the preservative is selected from one or more of octyl-isothiazolinone, bisbenzamide, benzimidazole carbamate and ethylene bis-dithiocarbamic acid ammonium;
the polyurethane thickener is selected from one or more of hydrophobic group modified ethoxypolyurethane polymer, polyurethane associative polymer, carbamate, polyoxyethylene and derivatives thereof.
5. A method for preparing the exposed aqueous polyurethane waterproof paint as claimed in any one of claims 1 to 4, comprising the following steps:
s1, adding hydroxyethyl cellulose, a pH regulator and a defoaming agent into deionized water, and stirring under the condition of 500-1000 r/min;
s2, continuously adding the aqueous polyurethane dispersion and the dispersing agent and stirring;
s3, the rotating speed is increased to 1100-1300r/min, and rutile type titanium dioxide, modified shell powder, flame retardant, light heat insulation material and filler are slowly added for stirring;
s4, reducing the rotating speed to 500-700r/min, continuously adding the film forming auxiliary agent, the preservative and the polyurethane thickener, and uniformly stirring;
the preparation method of the modified shell powder comprises the following steps:
a1, treating shell powder with 5-10% HCl solution, and further treating the shell powder with 5-10% HF solution;
and A2, drying the shell powder obtained by acid solution treatment at 100 ℃, and sieving the shell powder by a 1200-mesh sieve.
6. A method of constructing the exposed aqueous polyurethane waterproof paint as claimed in any one of claims 1 to 4, comprising the steps of: a1, cleaning a base layer; a2, constructing and reinforcing a rigid waterproof layer; a3, performing gap reinforcement treatment; a4, large-surface construction.
7. The construction method of the exposed water-based polyurethane waterproof paint according to claim 6, wherein the base layer cleaning is specifically as follows: firstly, loosening a base layer, removing dirt and projections, and then quickly repairing the base layer by using a plugging king;
the construction and reinforcement of the rigid waterproof layer are specifically as follows: the rigid waterproof layer is constructed once by waterproof paint meeting the JCT2090-2011I type standard requirement, and the base layer is reinforced;
the gap strengthening treatment specifically comprises the following steps: nylon mesh cloth with the width of 100mm and the pitch of 3mm is used as a reinforcing layer at the position where the base layer is easy to generate cracks and at the two sides of the separation seams, the center of the mesh cloth is ensured to be positioned at the positions where the cracks, the prepared exposed water-based polyurethane waterproof paint is used for 2 times of painting until the mesh cloth is completely wrapped, and the next construction can be carried out after the mesh cloth is completely dried;
the large-surface construction is specifically as follows: firstly, coating a water-based epoxy interface agent on the large surface except the gap reinforcing layer, and after the water-based epoxy interface agent is completely dried, carrying out large-surface construction by using the prepared exposed water-based polyurethane waterproof paint, and coating for 2-3 times to ensure that the thickness reaches 1.8mm, wherein the construction direction between two adjacent times is vertical.
8. The construction method of the exposed water-based polyurethane waterproof paint as claimed in claim 7, wherein the water-based epoxy interface agent comprises the following components in mass ratio 1:1, uniformly mixing and using, wherein the component A comprises the following components in parts by mass: 250-300 parts of epoxy dispersoid, 6-10 parts of film forming additive, 5-9 parts of wetting agent, 0.5-3 parts of defoamer and 500-740 parts of deionized water; the component B comprises the following components in parts by mass: 280-300 parts of curing agent, 0.5-3 parts of defoaming agent and 650-750 parts of deionized water.
CN202211710882.1A 2022-12-29 2022-12-29 Exposed water-based polyurethane waterproof coating and preparation method and construction method thereof Pending CN116082940A (en)

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