CN111363470A - Anti-sagging facade construction type single-component polyurethane waterproof coating and preparation and construction methods thereof - Google Patents
Anti-sagging facade construction type single-component polyurethane waterproof coating and preparation and construction methods thereof Download PDFInfo
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- CN111363470A CN111363470A CN202010381128.2A CN202010381128A CN111363470A CN 111363470 A CN111363470 A CN 111363470A CN 202010381128 A CN202010381128 A CN 202010381128A CN 111363470 A CN111363470 A CN 111363470A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
- C08G18/4812—Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4829—Polyethers containing at least three hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6685—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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- 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
Abstract
The invention provides an anti-sagging facade construction type single-component polyurethane waterproof coating, which is used for solving the technical defect that the coating is frequently used for facade brushing in the construction process of the waterproof coating. The invention also provides a one-pot preparation method, which is simple and convenient to produce and high in efficiency. The single-component polyurethane waterproof paint is thick and non-stick, when stirring is carried out, the viscosity is greatly reduced, the scraping construction is facilitated, the scraping hand feeling is good, the vertical surface is scraped at one time, the thickness is 1.0-2.0 mm, the paint does not flow, no bubble is left in the paint film, the construction time is greatly saved, and the construction quality is ensured.
Description
Technical Field
The invention belongs to the field of building waterproof coatings, particularly relates to a single-component polyurethane waterproof coating, and particularly relates to an anti-sagging facade construction type single-component polyurethane waterproof coating, and preparation and construction methods thereof.
Background
In the construction process of the waterproof coating, the condition that the coating is used for vertical face brushing is often met, and meanwhile, the thickness of the coating is generally required to be 1.5 mm-2.0 mm in order to ensure the waterproof effect. At present, a common single-component polyurethane waterproof coating has low viscosity and good leveling property, and is easy to flow and fall during vertical surface construction, the requirement of 1.5mm can be met only by constructing for 5-10 times, and meanwhile, due to the dual effects of flow and gravity, a vertical surface coating is thin at the top and thick at the bottom, so that the construction difficulty is increased, the construction period is prolonged, the engineering progress is influenced, and the difference of the protection effect of the upper part and the lower part of a vertical surface is large.
In order to solve the problems that the single-component polyurethane waterproof coating is easy to flow and fall in vertical surface construction and needs to be brushed for multiple times, the development of the thixotropic sagging-resistant polyurethane waterproof coating becomes a consensus of the industry. The common method is to add thixotropic agent such as nano fumed silica, modified bentonite, nano calcium carbonate, modified castor oil, polyamide wax, polyurea thixotropic agent and the like in the polyurethane coating. However, the actual application effect of the added thixotropic agent is not ideal, the product performance is greatly influenced by slight difference of the adding amount, the adding cost is high, and the development and the application of the product are greatly limited. In order to solve the problems of an additional thixotropic agent, Chinese patent CN 104559735A introduces a single-component reaction thixotropic polyurethane waterproof coating and a preparation method thereof, a diamine chain extender is also used for chain extension of a polyurethane prepolymer, a large number of urea groups are introduced on a molecular chain, however, in the preparation process, the amine chain extender has high reaction activity, a polymerization inhibitor is required to be added to prevent implosion and gelation, the cost is increased, the coating still needs 2-3 times of operation to reach 1.5-2.0 mm when being used for vertical construction, and the construction efficiency still needs to be improved. Chinese patent CN 109321122A discloses a quick-drying solvent-free anti-sagging polyurethane waterproof paint and a preparation method thereof, wherein the polyurethane prepolymer comprises polyether diol, polyether triol, isocyanate, and secondary amine chain extender, and during the production process, the prepolymer is synthesized, then the pigment and filler are subjected to infrared heating for removing water, and finally the prepolymer, the pigment and filler, the defoamer, and the additional thixotropic agent are mixed and stirred to form the final product.
Disclosure of Invention
Aiming at the technical defects of the existing single-component polyurethane waterproof coating, through a series of research works, the applicant invents an anti-flow falling vertical face construction type single-component polyurethane waterproof coating which has good scraping hand feeling, the vertical face is scraped with a thickness of 1.0-2.0 mm at one time, and the coating does not flow and has no bubble residue.
The invention aims to provide a flow falling resistant vertical-face construction type single-component polyurethane waterproof coating.
In order to achieve the purpose, the invention provides the following technical scheme:
an anti-sagging facade construction type single-component polyurethane waterproof coating comprises the following components in parts by weight:
20-30 parts of polyether polyol;
10-20 parts of a plasticizer;
40-50 parts of pigment and filler;
0.1-0.5 part of dispersant;
3-7 parts of isocyanate;
0.3-1.0 part of diamine chain extender;
0.1-0.5 part of high-performance auxiliary agent;
0.1-0.5 parts of catalyst;
0.5-2.0 parts of a latent curing agent;
5-10 parts of a mixed solvent;
wherein, the high-performance auxiliary agent comprises a defoaming agent and a leveling agent.
Preferably, the polyether polyol is one or a mixture of two of polyether diol and polyether triol, the molecular weight of the polyether polyol is 1000-5000 g/mol, and the hydroxyl value is 20-100 mgKOH/g. Further, the polyether diol is polyether diol 2000D; the polyether triol is polyether triol 330N.
Preferably, the plasticizer is one or a mixture of more of dibutyl phthalate, dioctyl phthalate, diisononyl phthalate, dioctyl adipate, dioctyl terephthalate, acetyl tributyl citrate and 52# chlorinated paraffin.
Preferably, the pigment filler comprises a filler and a pigment, the filler is one or a mixture of heavy calcium carbonate, light calcium carbonate, talcum powder, sericite powder, calcined kaolin, fly ash and organic bentonite, and the particle size range is 800-4000 meshes; the pigment is one of carbon black and iron oxide red.
Preferably, the isocyanate is one or a mixture of two of Toluene Diisocyanate (TDI) and diphenylmethane diisocyanate (MDI); the diamine chain extender is one or a mixture of isophorone diamine, 3-chloro-3 '-ethyl-4, 4' -diaminodiphenylmethane and 4,4 '-diamino-3, 3' -diethyl-diphenylmethane. On the basis of traditional polyurethane coating synthesis, a specific diamine chain extender is utilized to react with an isocyanate group-terminated polyurethane prepolymer, a polyurea structure is generated on a molecular chain, and the thixotropic effect required by the coating is generated through multiple hydrogen bond actions among urea groups.
Preferably, the catalyst is one or a mixture of two of an organic tin catalyst and a tertiary amine catalyst, the organic tin catalyst is stannous octoate, dilauryl dibutyltin and the like, and the tertiary amine catalyst is dimorpholinyl diethyl ether and triethylene diamine.
Preferably, the latent curing agent is one of oxazolidine or aldimine latent curing agents. The aldimine latent curing agent is LCA-26, and the oxazolidine latent curing agent is ALT-402. Aiming at the characteristics that chemical reaction bubbles are generated in the curing process of the moisture-cured single-component polyurethane coating and the thixotropic coating has large consistency after construction, the invention adds a proper amount of latent curing agent, can avoid or reduce the generation of the chemical reaction bubbles in the moisture-cured process and prevent the coating defects.
Preferably, the mixed solvent is a mixed solvent consisting of two or more of ethoxyethyl acetate, mesityl oxide, dimethylformamide, dimethyl sulfoxide, ethyl acetate, butyl acetate, 100# solvent oil, 150# solvent oil and xylene.
In the single-component reaction thixotropic polyurethane waterproof coating introduced in patent CN 104559735A and the preparation method thereof, a diamine chain extender is used for chain extension of a polyurethane prepolymer, a large number of urea groups are introduced on a molecular chain, however, in the preparation process, the amine chain extender has too high reaction activity, a polymerization inhibitor is required to be added to prevent polymerization and gelation, the cost is increased, and the coating still needs 2-3 times of operation to reach 1.5 mm-2.0 mm and does not flow when being used for vertical construction. The invention adopts diamine chain extender and isocyanate group-terminated polyurethane prepolymer to react in mixed solvent composed of different polar solvents, endows specific polar solvent environment, does not need additional polymerization inhibitor, has controllable reaction rate, generates specific polyurea structure on molecular chain, and can generate thixotropic effect required by paint through multiple hydrogen bond action among urea groups.
Preferably, the content of the polyurea structure in the molecular weight is 3-8%. And is more beneficial to the formation of multiple hydrogen bonds between urea groups.
The second purpose of the invention is to provide a preparation method of the single-component polyurethane waterproof coating, which is a one-pot method, all preparation processes are carried out in the same reaction kettle, the production is simple and convenient, and the efficiency is high.
The preparation method comprises the following steps:
1) weighing raw materials according to the weight parts, putting polyether polyol, a plasticizer, a dispersing agent and a defoaming agent into a reactor for stirring, adding pigments and fillers after stirring uniformly, and performing vacuum dehydration at the dehydration temperature of 110-120 ℃ and the vacuum degree of lower than-0.09 MPa for 2-4 h;
2) after dehydration, closing the vacuum pump, cooling to 80-85 ℃, adding isocyanate, and reacting for 2-3 h;
3) cooling to 50-60 ℃, adding a diamine chain extender and a 1/2 mixed solvent, and continuously reacting for 0.5-1 h;
4) maintaining the temperature at 50-60 ℃, adding a catalyst, a flatting agent and a 1/4 mixed solvent, and continuously reacting and stirring for 0.5-1 h;
5) maintaining the temperature at 50-60 ℃, adding the latent curing agent and the residual 1/4 mixed solvent, and continuously stirring for 0.5-1 h;
6) and opening a vacuum pump, wherein the vacuum degree is lower than-0.08 MPa, carrying out vacuum defoaming for 0.5h, closing the vacuum pump, finishing the reaction, filling nitrogen to protect and discharging to obtain the single-component polyurethane waterproof coating.
Another object of the present invention is to provide a method for constructing a facade by using the above one-component polyurethane waterproofing paint, which is one of the following methods:
direct blade coating construction: the single-component polyurethane waterproof paint is not stirred and is directly coated in a scraping way, and the thickness of the one-time coating is 2 mm-3 mm;
blade coating construction after slight stirring: slightly stirring the single-component polyurethane waterproof paint until the paint flows, and carrying out blade coating on the paint at one time to form a paint with the thickness of 1-2 mm.
The invention has the following advantages and beneficial effects:
1. the invention adopts diamine chain extender and isocyanate group-terminated polyurethane prepolymer to react in the mixed solvent composed of different polar solvents, endows the environment of specific polar solvent, does not need additional polymerization inhibitor, has controllable reaction rate, generates a proper amount of polyurea structure on the molecular chain, and generates the thixotropic effect required by the coating;
2. aiming at the characteristics that chemical reaction bubbles are generated in the curing process of the moisture-cured single-component polyurethane coating and the thixotropic coating has large consistency after construction, the invention adds a proper amount of latent curing agent, can avoid or reduce the generation of the chemical reaction bubbles in the moisture-cured process and prevent the coating defects;
3. the polyurethane coating is thick and non-stick, the viscosity is greatly reduced when the polyurethane coating is stirred, so that the coating construction is facilitated, the coating hand feeling is good, the vertical surface is coated at one time, the coating thickness is 1.0-2.0 mm, the flow is avoided, no bubble remains exist in the coating film, the construction time is greatly saved, and the construction quality is ensured;
4. the invention provides a preparation method of a single-component polyurethane waterproof coating, which is a one-pot method, all preparation processes are carried out in the same reaction kettle, and the preparation method is simple and convenient to produce and high in efficiency.
5. The invention provides a vertical face construction method, which can be used for blade coating construction directly or after slight stirring, is simple in construction method, has the blade coating thickness exceeding 1mm at one time, and does not generate flow drop.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An anti-sagging facade construction type single-component polyurethane waterproof coating comprises the following components in parts by weight:
polyether polyol: polyether glycol 2000D, 10 parts; polyether triol 330N, 10 parts;
plasticizer: 5 parts of No. 52 chlorinated paraffin; 5 parts of dibutyl phthalate;
pigment and filler: 35 parts of heavy calcium carbonate; 5 parts of talcum powder; 0.3 part of carbon black;
0.1 part of dispersant;
isocyanate, Toluene Diisocyanate (TDI), 3 parts;
diamine chain extenders: 0.3 part of isophorone diamine;
high-performance auxiliaries: 0.1 part of defoaming agent; 0.1 part of leveling agent;
catalyst: 0.1 part of organotin catalyst T-12;
latent curing agent: 0.5 part of aldimine latent curing agent LCA-26;
mixing solvent: 2 parts of dimethylformamide; 100# solvent oil, 3 parts.
Example 2
An anti-sagging facade construction type single-component polyurethane waterproof coating comprises the following components in parts by weight:
polyether polyol: polyether glycol 2000D, 25 parts; polyether triol 330N, 5 parts;
plasticizer: no. 52 chlorinated paraffin, 10 parts; 8 parts of dibutyl phthalate;
pigment and filler: 0.3 part of pigment carbon black; 41 parts of heavy calcium carbonate; 4 parts of sericite powder;
0.2 part of dispersant;
isocyanate: 7 parts of diphenylmethane diisocyanate (MDI);
diamine chain extenders: 1.0 part of 3-chloro-3 '-ethyl-4, 4' -diaminodiphenylmethane;
high-performance auxiliaries: 0.3 part of defoaming agent; 0.1 part of leveling agent;
catalyst: 0.2 part of organic tin catalyst T-12;
latent curing agent: ALT-402, 2.0 parts;
mixing solvent: dimethyl formamide, 4 parts; 100# solvent oil, 6 parts.
Example 3
An anti-sagging facade construction type single-component polyurethane waterproof coating comprises the following components in parts by weight:
polyether polyol: polyether glycol 2000D, 25 parts; polyether triol 330N, 5 parts;
plasticizer: 13 parts of No. 52 chlorinated paraffin; 5 parts of dioctyl terephthalate;
pigment and filler: 37 parts of ground calcium carbonate; 8 parts of calcined kaolin; 0.3 part of carbon black;
0.2 part of dispersant;
isocyanate, Toluene Diisocyanate (TDI), 3 parts;
diamine chain extenders: 0.5 part of 4,4 '-diamino-3, 3' -diethyl-diphenylmethane;
high-performance auxiliaries: 0.3 part of defoaming agent; 0.1 part of leveling agent;
catalyst: 0.2 part of organic tin catalyst T-12;
latent curing agent: LCA-26, 2.0 parts;
mixing solvent: 5 parts of mesityl oxide; 150# solvent oil, 5 parts.
Example 4
An anti-sagging facade construction type single-component polyurethane waterproof coating comprises the following components in parts by weight:
polyether polyol: polyether diol 2000D, 15 parts; polyether triol 330N, 5 parts;
plasticizer: diisononyl phthalate, 5 parts; 5 parts of dioctyl terephthalate; 5 parts of acetyl tributyl citrate;
pigment and filler: 40 parts of light calcium carbonate; 9 parts of organic bentonite; 0.3 part of iron oxide red;
0.5 part of dispersant;
isocyanate: 3 parts of toluene diisocyanate; 4 parts of diphenylmethane diisocyanate.
Diamine chain extenders: 0.3 part of 4,4 '-diamino-3, 3' -diethyl-diphenylmethane;
high-performance auxiliaries: 0.1 part of defoaming agent; 0.1 part of leveling agent;
catalyst: 0.2 part of triethylene diamine; dibutyl tin dilaurate, 0.3 part
Latent curing agent: 0.5 part of oxazolidine latent curing agent ALT-402;
mixing solvent: 5 parts of No. 100 solvent oil; ethoxyethyl acetate, 5 parts.
Example 5
The anti-sagging facade construction type single-component polyurethane waterproof coating of the embodiment 1 to 4 is weighed according to the weight part, and the single-component polyurethane waterproof coating 1 to 4 is prepared according to the following steps.
1) Putting the metered polyether polyol, the plasticizer, the dispersing agent and the defoaming agent into a reactor for stirring, adding the pigment and the filler after uniform stirring, and performing vacuum dehydration at the dehydration temperature of 110-120 ℃ and the vacuum degree of less than-0.09 MPa for 2-4 h;
2) after dehydration, closing the vacuum pump, cooling to 80-85 ℃, adding metered isocyanate, and reacting for 2-3 h;
3) cooling to 50-60 ℃, adding the weighed diamine chain extender and 2/4 mixed solvent, maintaining the temperature at 50-60 ℃, and continuing to react for 0.5-1 h;
4) cooling to 50-60 ℃, adding the metered catalyst, flatting agent and 1/4 mixed solvent, and continuing to react and stir for 0.5-1 h;
5) and maintaining the temperature at 50-60 ℃, adding the metered latent curing agent and the residual 1/4 mixed solvent, and continuously stirring for 0.5-1 h.
6) And opening a vacuum pump, keeping the vacuum degree lower than-0.08 MPa, carrying out vacuum defoaming for 0.5 hour, closing the vacuum pump, finishing the reaction, and filling nitrogen to protect discharging.
A vertical face construction method of 1-4 parts of single-component polyurethane waterproof paint is one of the following methods:
direct blade coating construction: the single-component polyurethane waterproof paint is not stirred and is directly scraped, the one-time scraping thickness is 2-3 mm, and the scraping construction result shows that the single-component polyurethane waterproof paint 1-4 is in a non-flowing state when not stirred, but has no barrier and no labor when being scraped, and the flow falling does not occur when the single-component polyurethane waterproof paint is scraped and coated for 2-3 mm.
Blade coating construction after slight stirring: the single-component polyurethane waterproof paint is slightly stirred to be in a flowing state, the thickness of the paint is 1-2 mm through one-time blade coating, the paint is slightly stirred to be in a flowing state, the viscosity is obviously reduced, the thickness of the paint is 1-2 mm through one-time blade coating, and the paint does not flow and fall.
After the coating film is dried in the construction method of the vertical face, no residual air holes or air bubbles exist, and the surface of the coating film is smooth.
The construction comparison is carried out by adopting the existing common single-component polyurethane coating products which can be sprayed, brushed and blade-coated for construction in the market: the thickness of the paint is 0.5-1 mm through one-time blade coating, the paint flows seriously, the thickness of the paint can reach 1-1.5 mm through 6-10-time blade coating, and the film thickness of the upper part of the vertical surface is obviously different from that of the bottom.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The anti-sagging facade construction type single-component polyurethane waterproof coating is characterized by comprising the following components in parts by weight: the coating comprises the following components in parts by weight:
20-30 parts of polyether polyol;
10-20 parts of a plasticizer;
40-50 parts of pigment and filler;
0.1-0.5 part of dispersant;
3-7 parts of isocyanate;
0.3-1.0 part of diamine chain extender;
0.1-0.5 part of high-performance auxiliary agent;
0.1-0.5 parts of catalyst;
0.5-2.0 parts of a latent curing agent;
5-10 parts of a mixed solvent;
wherein, the high-performance auxiliary agent comprises a defoaming agent and a leveling agent.
2. The one-component polyurethane waterproof coating material according to claim 1, characterized in that: the polyether polyol is one or a mixture of two of polyether diol and polyether triol, the molecular weight of the polyether polyol is 1000-5000 g/mol, and the hydroxyl value is 20-100 mg KOH/g.
3. The one-component polyurethane waterproof coating material according to claim 1, characterized in that: the plasticizer is one or a mixture of more of dibutyl phthalate, dioctyl phthalate, diisononyl phthalate, dioctyl adipate, dioctyl terephthalate, acetyl tributyl citrate and 52# chlorinated paraffin.
4. The one-component polyurethane waterproof coating material according to claim 1, characterized in that: the pigment filler comprises a filler and a pigment, the filler is one or a mixture of heavy calcium carbonate, light calcium carbonate, talcum powder, sericite powder, calcined kaolin, fly ash and organic bentonite, and the particle size range of the filler is 800-4000 meshes; the pigment is one of carbon black and iron oxide red.
5. The one-component polyurethane waterproof coating material according to claim 1, characterized in that: the isocyanate is one or a mixture of Toluene Diisocyanate (TDI) and diphenylmethane diisocyanate (MDI); the diamine chain extender is one or a mixture of isophorone diamine, 3-chloro-3 '-ethyl-4, 4' -diaminodiphenylmethane and 4,4 '-diamino-3, 3' -diethyl-diphenylmethane.
6. The one-component polyurethane waterproof coating material according to claim 1, characterized in that: the catalyst is one or a mixture of two of an organic tin catalyst and a tertiary amine catalyst.
7. The one-component polyurethane waterproof coating material according to claim 1, characterized in that: the latent curing agent is one of oxazolidine or aldimine latent curing agents.
8. The one-component polyurethane waterproof coating material according to claim 1, characterized in that: the mixed solvent is a mixed solvent consisting of two or more of ethoxyethyl acetate, mesityl oxide, dimethylformamide, dimethyl sulfoxide, ethyl acetate, butyl acetate, 100# solvent oil, 150# solvent oil and xylene.
9. The method for preparing the one-component polyurethane waterproof coating according to any one of claims 1 to 8, wherein: the preparation method comprises the following steps:
1) putting polyether polyol, a plasticizer, a dispersing agent and a defoaming agent into a reactor, stirring, adding pigments and fillers after stirring uniformly, and performing vacuum dehydration at the dehydration temperature of 110-120 ℃ and the vacuum degree of less than-0.09 MPa for 2-4 h;
2) after dehydration, closing the vacuum pump, cooling to 80-85 ℃, adding isocyanate, and reacting for 2-3 h;
3) cooling to 50-60 ℃, adding a diamine chain extender and a 1/2 mixed solvent, and reacting for 0.5-1 h;
4) maintaining the temperature at 50-60 ℃, adding a catalyst, a flatting agent and a 1/4 mixed solvent, and continuously reacting and stirring for 0.5-1 h;
5) maintaining the temperature at 50-60 ℃, adding the latent curing agent and the residual 1/4 mixed solvent, and continuously stirring for 0.5-1 h;
6) and opening a vacuum pump, wherein the vacuum degree is lower than-0.08 MPa, carrying out vacuum defoaming for 0.5h, closing the vacuum pump, finishing the reaction, filling nitrogen to protect and discharging to obtain the single-component polyurethane waterproof coating.
10. The method for constructing the one-component polyurethane waterproof paint obtained by the method for preparing the one-component polyurethane waterproof paint according to claim 9, is characterized in that: the construction method is one of the following methods:
1) direct blade coating construction: the single-component polyurethane waterproof paint is not stirred and is directly coated in a scraping way, and the thickness of the one-time coating is 2 mm-3 mm;
2) blade coating construction after slight stirring: slightly stirring the single-component polyurethane waterproof paint until the paint flows, and carrying out blade coating on the paint at one time to form a paint with the thickness of 1-2 mm.
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| CN113416485A (en) * | 2021-08-06 | 2021-09-21 | 四川三棵树涂料有限公司 | Anti-sagging polyurethane waterproof coating and preparation method thereof |
| CN114316777A (en) * | 2022-01-28 | 2022-04-12 | 四川迈铁龙科技有限公司 | Spraying type polyurethane waterproof coating and preparation method and construction method thereof |
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| CN114316777A (en) * | 2022-01-28 | 2022-04-12 | 四川迈铁龙科技有限公司 | Spraying type polyurethane waterproof coating and preparation method and construction method thereof |
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Address after: Group 6, Juntian village, Qingliu Town, Xindu District, Chengdu, Sichuan 610000 Applicant after: Sichuan Weidun ingenuity Construction Co.,Ltd. Address before: Group 6, Juntian village, Qingliu Town, Xindu District, Chengdu, Sichuan 610000 Applicant before: SICHUAN HONGYUAN WATERPROOF PROJECT Co.,Ltd. |
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