CN114316777A - Spraying type polyurethane waterproof coating and preparation method and construction method thereof - Google Patents
Spraying type polyurethane waterproof coating and preparation method and construction method thereof Download PDFInfo
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- CN114316777A CN114316777A CN202210106594.9A CN202210106594A CN114316777A CN 114316777 A CN114316777 A CN 114316777A CN 202210106594 A CN202210106594 A CN 202210106594A CN 114316777 A CN114316777 A CN 114316777A
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 53
- 239000004814 polyurethane Substances 0.000 title claims abstract description 53
- 238000000576 coating method Methods 0.000 title claims abstract description 47
- 239000011248 coating agent Substances 0.000 title claims abstract description 43
- 238000005507 spraying Methods 0.000 title claims abstract description 25
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 229920005862 polyol Polymers 0.000 claims abstract description 32
- 150000003077 polyols Chemical class 0.000 claims abstract description 31
- 239000002904 solvent Substances 0.000 claims abstract description 26
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 25
- 229920000570 polyether Polymers 0.000 claims abstract description 25
- 229920005906 polyester polyol Polymers 0.000 claims abstract description 24
- 239000002270 dispersing agent Substances 0.000 claims abstract description 19
- 239000004970 Chain extender Substances 0.000 claims abstract description 18
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 18
- 239000012948 isocyanate Substances 0.000 claims abstract description 16
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims abstract description 14
- 239000000945 filler Substances 0.000 claims abstract description 14
- 239000000049 pigment Substances 0.000 claims abstract description 14
- 239000013008 thixotropic agent Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000004078 waterproofing Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 51
- 239000007921 spray Substances 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 30
- 239000002585 base Substances 0.000 claims description 24
- -1 2, 3-dihydroxypropanesulfonic acid amine Chemical class 0.000 claims description 19
- 239000010410 layer Substances 0.000 claims description 14
- 229920001451 polypropylene glycol Polymers 0.000 claims description 13
- 239000003973 paint Substances 0.000 claims description 12
- 230000018044 dehydration Effects 0.000 claims description 10
- 238000006297 dehydration reaction Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 8
- 229920000909 polytetrahydrofuran Polymers 0.000 claims description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 239000003921 oil Substances 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 125000003118 aryl group Chemical group 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 4
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 239000012970 tertiary amine catalyst Substances 0.000 claims description 4
- 239000012974 tin catalyst Substances 0.000 claims description 4
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 4
- 229920003232 aliphatic polyester Polymers 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 claims description 3
- 238000011282 treatment Methods 0.000 claims description 3
- 229920002554 vinyl polymer Polymers 0.000 claims description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 2
- IBOFVQJTBBUKMU-UHFFFAOYSA-N 4,4'-methylene-bis-(2-chloroaniline) Chemical compound C1=C(Cl)C(N)=CC=C1CC1=CC=C(N)C(Cl)=C1 IBOFVQJTBBUKMU-UHFFFAOYSA-N 0.000 claims description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 2
- 229910021485 fumed silica Inorganic materials 0.000 claims description 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical group [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 2
- 239000007787 solid Substances 0.000 abstract description 6
- 150000002009 diols Chemical class 0.000 description 14
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 6
- 230000032683 aging Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 239000013557 residual solvent Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000011527 polyurethane coating Substances 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
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- Paints Or Removers (AREA)
Abstract
The invention discloses a spraying type polyurethane waterproof coating, a preparation method and a construction method thereof, and solves the technical problem that the polyurethane waterproof coating in the prior art cannot have ultrahigh strength and ultrahigh toughness at the same time. The preparation of the polyurethane waterproof coating comprises the following raw materials in parts by weight: 170 parts of polyether polyol 136; 0-20 parts of polyester polyol; 34-65 parts of isocyanate; 15-25 parts of a solvent; 8.8-11 parts of pigment; 10-12 parts of a filler; 1.5-3 parts of a chain extender; 0.8-1 part of defoaming agent; 1.4-1.8 parts of thixotropic agent; 0.4-0.6 part of dispersant; 0.15-0.35 part of catalyst. The invention has the characteristics of ultrahigh tensile strength, ultrahigh toughness and high solid content, is suitable for waterproofing of important projects such as railways, highways, bridges, tunnels, dams and the like, and has high construction efficiency.
Description
Technical Field
The invention relates to the technical field of waterproof coatings, in particular to a spray type polyurethane waterproof coating and a preparation method and a construction method thereof.
Background
With the development of science and technology, the research and development capability of waterproof coatings is remarkably improved, and the current direction of key research and application is developing towards waterproof materials with strong functionality and good environmental protection. The polyurethane waterproof coating has the advantages of high toughness, high strength, good adhesion and excellent tear resistance, can form a closed, continuous and seamless whole body after being dried and cured on a base layer, improves the waterproof and anti-permeability capability of a matrix structure, has strong adaptability to cracks and deformation of the base layer, and can also slow down the aging and corrosion of a base material, thereby improving the durability of the base material.
However, for some special fields of waterproofing, the performance index of the common polyurethane waterproof coating still cannot meet the application requirement. For example, the concrete bridge deck of a railway bridge has high requirements on the aging resistance, chemical corrosion resistance, fatigue resistance and other performances of the material due to the water resistance and the large-amplitude vibration generated when vehicles pass through the concrete bridge deck. If the material performance is lower, serious damage problems such as bridge surface layer water seepage, concrete spalling and the like can be easily caused in the using process. Accordingly, there is a need for higher performance specifications for the provision of waterproofing materials for concrete decks for railway bridges and other special applications, as well as for higher requirements for strength, elongation at break, resistance to aging and corrosion.
The tensile property of the polyurethane waterproof coating determines whether the polyurethane waterproof coating can avoid the damage such as peeling and falling off caused by the shear stress generated between the polyurethane waterproof coating and other base materials. The high-strength high-toughness polyurethane coating film has ultrahigh tensile property, can enable the coating film to show excellent wear resistance, and has stronger resistance to cracks and deformation caused by stress. On the other hand, when the common single-component polyurethane waterproof coating is applied to vertical wall construction, the flow phenomenon often occurs due to low viscosity, so that the vertical coating is thin at the top and thick at the bottom, the protection effect is weakened, the construction difficulty is increased, and the period is prolonged. Therefore, for waterproofing of a facade wall in a special field, it is necessary to facilitate construction while ensuring excellent mechanical properties. The technical key and difficulty of the spray-type high-performance polyurethane waterproof coating are that the tensile strength and the elongation at break of a common material are two opposite indexes, and a product with ultrahigh tensile strength and ultrahigh toughness is difficult to obtain. At present, polyurethane coating products with ultrahigh strength and ultrahigh toughness do not appear in the waterproof market.
In Chinese patent with application number CN202110412387.1 and the patent name of high-strength high-solid content single-component polyurethane waterproof paint and the preparation method thereof, the mean value of the tensile strength of the disclosed high-strength high-solid content single-component polyurethane is 6.8 MPa; the documents of 'development of high-strength single-component polyurethane waterproof paint' published in 2013 and 'development of high-strength single-component polyurethane waterproof paint' published in 2018 of China building waterproof magazines indicate that the tensile strength of the prepared high-strength single-component polyurethane is optimal to be about 7.2 MPa. The waterproof coating can only meet the waterproof requirements of common buildings, and can not meet some special waterproof requirements.
In chinese patent with application No. CN201910206784.6 entitled one-component polyurethane waterproof paint and its preparation method, the disclosed polyurethane waterproof paint has a high tensile strength (22.5MPa), but its elongation at break is only 450%, and cannot be fully adapted to deformation of buildings and application in some special fields.
The applicant has found that the prior art has at least the following technical problems:
the polyurethane waterproof coating in the prior art cannot simultaneously have ultrahigh strength and ultrahigh toughness.
Disclosure of Invention
The invention aims to provide a spraying type polyurethane waterproof coating, and a preparation method and a construction method thereof, and aims to solve the technical problem that the polyurethane waterproof coating in the prior art cannot simultaneously have ultrahigh strength and ultrahigh toughness.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a spray-coating polyurethane waterproof paint which is prepared from the following raw materials in parts by weight: 170 parts of polyether polyol 136; 0-20 parts of polyester polyol; 34-65 parts of isocyanate; 15-25 parts of a solvent; 8.8-11 parts of pigment; 10-12 parts of a filler; 1.5-3 parts of a chain extender; 0.8-1 part of defoaming agent; 1.4-1.8 parts of thixotropic agent; 0.4-0.6 part of dispersant; 0.15-0.35 part of catalyst; wherein,
the polyester polyol is aromatic polyester polyol and/or adipic acid series saturated aliphatic polyester polyol, and the molecular weight of the polyester polyol is 2000-5000;
the chain extender comprises 2, 3-dihydroxypropanesulfonic acid amine and also comprises any one or more of ethylene glycol, ethanolamine and 3,3 '-dichloro-4, 4' -diaminodiphenylmethane; wherein the 2, 3-dihydroxypropanesulfonic acid amine is added in an amount of at least 1/6 based on the total weight of the chain extender.
Further, the weight parts of the raw materials are respectively as follows: 141-157 parts of polyether polyol; 10-15 parts of polyester polyol; 45-60 parts of isocyanate; 15-20 parts of a solvent; 9-10.8 parts of pigment; 10-12 parts of a filler; 1.5-2.5 parts of a chain extender; 0.9-1 part of defoaming agent; 1.6-1.8 parts of thixotropic agent; 0.4-0.5 part of dispersant; 0.15-0.3 part of catalyst.
Further, the weight parts of the raw materials are respectively as follows: 157 parts of polyether polyol; 10 parts of polyester polyol; 60 parts of isocyanate; 15 parts of a solvent; 9 parts of a pigment; 12 parts of a filler; 1.5 parts of a chain extender; 1 part of a defoaming agent; 1.8 parts of a thixotropic agent; 0.5 part of a dispersant; 0.15 part of catalyst.
Further, the polyether polyol is any one or more of polyoxypropylene polyol, vinyl polymer grafted polyether polyol and polytetrahydrofuran polyol, and the molecular weight of the polyether polyol is 500-8000.
Further, the isocyanate is any one or two of toluene diisocyanate, diphenylmethane diisocyanate and isophorone diisocyanate; and the ratio of the molar amount of-NCO contained in the isocyanate to the total molar amount of-OH contained in the polyether polyol and the polyester polyol is 4-4.5: 1.
Further, the solvent is any one of dimethylformamide, 100# solvent oil, 150# solvent oil and 180# solvent oil;
the defoaming agent is an organic silicon defoaming agent;
the thixotropic agent is any one or more of polyamide wax, organic bentonite and fumed silica;
the dispersant is an environment-friendly dispersant;
the catalyst is an organic tin catalyst and/or a tertiary amine catalyst; the organic tin catalyst is stannous octoate and/or dibutyltin dilaurate; the tertiary amine catalyst is dimorpholinyl diethyl ether and/or triethylene diamine.
Further, the pigment is carbon black and/or rutile type titanium dioxide; the filler is any one or more of heavy calcium carbonate, nano calcium carbonate and organic bentonite.
The preparation method of the spray type polyurethane waterproof coating provided by the invention is characterized by comprising the following steps of:
s1, blending according to the proportion;
s2, adding polyether polyol, polyester polyol, a thixotropic agent, a dispersing agent and a defoaming agent into a reaction kettle, uniformly stirring, and keeping the temperature of the reaction kettle at 110-120 ℃ during stirring; continuously adding the pigment and the filler, uniformly stirring, and then carrying out vacuum dehydration for 1-2h under the vacuum degree of lower than-0.09 MPa to obtain a premix;
s3, after the dehydration is finished, closing the vacuum pump, cooling to 65-70 ℃, adding isocyanate and partial solvent into the reaction kettle, keeping the temperature of the reaction kettle at 65-70 ℃, and stirring for reaction for 2-3 hours;
s4, adding a catalyst into the reaction kettle, and stirring and reacting for 1-2 hours at the temperature of 65-70 ℃ in the reaction kettle;
s5, adding a chain extender and the rest solvent after the reaction is finished, and stirring and reacting for 0.5-1h while keeping the temperature of the reaction kettle at 65-70 ℃;
and S6, opening a vacuum pump, defoaming for 0.4-0.8h in vacuum at the vacuum degree of lower than-0.09 MPa, then closing the vacuum pump, and finishing the reaction to obtain the spray-coating type high-performance polyurethane waterproof coating.
Further, in the step S3, the added solvent is 40% to 60% of the total weight of the solvent.
The construction method of the spray type polyurethane waterproof coating provided by the invention comprises the following steps:
(1) performing shot blasting treatment on the uneven part and the loose surface layer of the base layer to ensure that the surface of the base layer is flat and has no phenomena of sanding and peeling; sweeping away dust on the base surface and flushing the base surface to ensure that the base surface has no floating dust or impurities;
(2) spraying with a spray gun at 15-35 deg.C and 45-75% relative humidity; during spraying operation, the spray gun is perpendicular to the spraying base layer, the distance between the spray gun and the spraying base layer is 48-52cm, the spray gun is moved at a constant speed of 30-60cm/s, and the spray gun is sprayed in a criss-cross mode until the thickness of a coating film is 1.0-1.5 mm.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
the spray polyurethane waterproof coating provided by the invention has the characteristics of ultrahigh tensile strength, ultrahigh toughness and high solid content, the tensile strength exceeds 15MPa, the elongation at break exceeds 1000%, the tear strength exceeds 40N/mm, the solid content exceeds 90%, the bonding strength is more than 3.0MPa, and the bonding durability is long, so that the spray polyurethane waterproof coating is suitable for waterproofing of important projects such as railways, highways, bridges, tunnels, dams and the like, for example, waterproofing projects in special fields such as concrete bridge decks of railway bridges, urban rail transit, construction of important infrastructures and the like due to the ultrahigh tensile strength and ultrahigh toughness; the coating film can have ultrahigh tensile strength and excellent toughness, and the construction efficiency can be greatly improved; specifically, the method comprises the following steps:
(1) the spray type polyurethane waterproof coating provided by the invention is prepared by using the compound polyol of polyester polyol with stronger polarity and high molecular structure regularity and polyether polyol with low bond cohesive energy and easy rotation; polyester polyol provides strength, thermal oxidation stability and the like for polyurethane, and polyether polyol provides low-temperature flexibility, hydrolysis resistance and the like; by adjusting the dosage and the proportion of the polyester polyol and the polyether polyol, the coating film has ultrahigh strength and ultrahigh toughness;
(2) the chain extender is introduced into the spray-coating polyurethane waterproof coating, and the polyurethane waterproof coating introduced with the chain extender is easy to generate hydrolysis reaction to generate macromolecular sulfonate ions which are hydrated with Ca generated by concrete2+Reacting to generate composite calcium salt, and organically combining the polymer chain with the inorganic structure of the concreteThe bonding agent is integrated microscopically, so that the chemical reaction bonding of the concrete structure and polyurethane is realized, the debonding caused by the phenomena of base surface moisture regain and the like is avoided, and the bonding agent plays a vital role in ensuring the engineering quality in the practical engineering application;
(3) the spray type polyurethane waterproof coating provided by the invention can be used for spray construction, has the anti-sagging performance of a vertical surface, and can greatly improve the construction efficiency.
Detailed Description
First, preparation example
1. Raw materials:
1.1 the polyether polyols of examples 1-6 have molecular weights, respectively:
example 1: polyoxypropylene diol 500, polyoxypropylene triol 1200, polytetrahydrofuran diol 2500;
example 2: polyoxypropylene diol 3000, vinyl polymer grafted polyether triol 4000 and polytetrahydrofuran diol 5000;
example 3: polyoxypropylene diol 6000, polyoxypropylene triol 8000 and polytetrahydrofuran diol 3500;
example 4: polyoxypropylene diol 7000, polyoxypropylene triol 5000, polytetrahydrofuran diol 2500;
example 5: polyoxypropylene diol 1500, polyoxypropylene triol 2500, polytetrahydrofuran diol 2000;
example 6: polyoxypropylene diol 2000, polyoxypropylene triol 6000, and polytetrahydrofuran diol 1200.
1.2 the molecular weights of the polyester polyols of examples 1-2 and examples 4-5 were:
example 1: aromatic polyester diol 2000;
example 2: saturated aliphatic polyester polyol 3000;
example 4: aromatic polyester glycol 4000;
example 5: 5000 parts of aromatic polyester diol;
1.3 examples 1-6 used dispersants and defoamers:
defoaming agent: silicone defoaming agents Efka-2020;
dispersing agent: and (4) an environment-friendly dispersant S-527.
1.4 the raw material formulations in examples 1-6 are shown in Table 1 below:
TABLE 1 example raw material proportions (by weight)
2. The preparation method comprises the following steps:
example 1:
the method comprises the following steps:
s1, blending according to the proportion;
s2, putting polyether polyol, polyester polyol, a thixotropic agent, a dispersing agent and a defoaming agent into a reaction kettle, uniformly stirring, and keeping the temperature of the reaction kettle at 115 ℃ during stirring; continuously adding the pigment and the filler, uniformly stirring, and then carrying out vacuum dehydration for 1.5h under the vacuum degree of-0.1 MPa to obtain a premix;
s3, after the dehydration is finished, closing the vacuum pump, cooling to 68 ℃, adding isocyanate and partial solvent into the reaction kettle, keeping the temperature of the reaction kettle at 68 ℃, and stirring for reaction for 1.5 hours;
s4, adding a catalyst into the reaction kettle, and stirring and reacting for 1.5 hours while keeping the temperature of the reaction kettle at 68 ℃;
s5, adding a chain extender and the residual solvent after the reaction is finished, and stirring and reacting for 0.8h while keeping the temperature of the reaction kettle at 68 ℃;
and S6, opening a vacuum pump, defoaming for 0.6h in vacuum at the vacuum degree of-0.1 MPa, then closing the vacuum pump, and finishing the reaction to obtain the spray-coating type high-performance polyurethane waterproof coating.
Example 2:
the method comprises the following steps:
s1, blending according to the proportion;
s2, putting polyether polyol, polyester polyol, a thixotropic agent, a dispersing agent and a defoaming agent into a reaction kettle, uniformly stirring, and keeping the temperature of the reaction kettle at 120 ℃ during stirring; continuously adding the pigment and the filler, uniformly stirring, and then carrying out vacuum dehydration for 1h under the vacuum degree of-0.15 MPa to obtain a premix;
s3, after the dehydration is finished, closing the vacuum pump, cooling to 70 ℃, adding isocyanate and partial solvent into the reaction kettle, keeping the temperature of the reaction kettle at 70 ℃, and stirring for reaction for 2 hours;
s4, adding a catalyst into the reaction kettle, and stirring and reacting for 1h while keeping the temperature of the reaction kettle at 70 ℃;
s5, adding a chain extender and the residual solvent after the reaction is finished, and stirring and reacting for 0.5h while keeping the temperature of the reaction kettle at 70 ℃;
and S6, opening a vacuum pump, defoaming for 0.4h in vacuum at the vacuum degree of-0.15 MPa, then closing the vacuum pump, and finishing the reaction to obtain the spray-coating type high-performance polyurethane waterproof coating.
Example 3:
the method comprises the following steps:
s1, blending according to the proportion;
s2, putting polyether polyol, polyester polyol, a thixotropic agent, a dispersing agent and a defoaming agent into a reaction kettle, uniformly stirring, and keeping the temperature of the reaction kettle at 110 ℃ during stirring; continuously adding the pigment and the filler, uniformly stirring, and then carrying out vacuum dehydration for 2h under the vacuum degree of-0.1 MPa to obtain a premix;
s3, after the dehydration is finished, closing the vacuum pump, cooling to 65 ℃, adding isocyanate and partial solvent into the reaction kettle, keeping the temperature of the reaction kettle at 65 ℃, and stirring for reaction for 3 hours;
s4, adding a catalyst into the reaction kettle, and stirring and reacting for 2 hours while keeping the temperature of the reaction kettle at 65 ℃;
s5, adding a chain extender and the residual solvent after the reaction is finished, and stirring and reacting for 1h while keeping the temperature of the reaction kettle at 65 ℃;
and S6, opening a vacuum pump, defoaming for 0.8h in vacuum at the vacuum degree of-0.1 MPa, then closing the vacuum pump, and finishing the reaction to obtain the spray-coating type high-performance polyurethane waterproof coating.
3. The construction method comprises the following steps:
the method comprises the following steps:
(1) performing shot blasting treatment on the uneven part and the loose surface layer of the base layer to ensure that the surface of the base layer is flat and has no phenomena of sanding and peeling; sweeping away dust on the base surface and flushing the base surface to ensure that the base surface has no floating dust or impurities;
(2) spraying with a spray gun at 15-35 deg.C and 45-75% relative humidity; during spraying operation, the spray gun is perpendicular to the spraying base layer, the distance between the spray gun and the spraying base layer is 48-52cm, the spray gun is moved at a constant speed of 30-60cm/s, and the spray gun is sprayed in a criss-cross mode until the thickness of a coating film is 1.0-1.5 mm.
Second, Experimental example
The performances of the spray-coating polyurethane waterproof coatings obtained in the examples 1 to 6 were tested by the method disclosed in GB19250-2013 "polyurethane waterproof coating", and the results are shown in table 2:
TABLE 2 Properties of spray type high-Performance polyurethane Water-repellent coating obtained in examples 1 to 6
As can be seen from table 2, the spray polyurethane waterproof coatings obtained in examples 1 to 6 of the present invention all have tensile strength of more than 15MPa, elongation at break of more than 1000%, tear strength of more than 40N/mm, excellent mechanical properties, good thermal aging resistance and good acid and alkali resistance, and the membrane can maintain high strength and ultrahigh elongation at break after 168 hours of heat, alkali and acid treatments. Meanwhile, the solid content exceeds 90 percent, the surface drying time and the actual drying time are short, the anti-sagging effect is excellent, and the spraying construction can be realized. Is a high-performance product suitable for important waterproof and moistureproof projects with high performance requirements.
Claims (10)
1. The spray type polyurethane waterproof coating is characterized by comprising the following raw materials in parts by weight: 170 parts of polyether polyol 136; 0-20 parts of polyester polyol; 34-65 parts of isocyanate; 15-25 parts of a solvent; 8.8-11 parts of pigment; 10-12 parts of a filler; 1.5-3 parts of a chain extender; 0.8-1 part of defoaming agent; 1.4-1.8 parts of thixotropic agent; 0.4-0.6 part of dispersant; 0.15-0.35 part of catalyst; wherein,
the polyester polyol is aromatic polyester polyol and/or adipic acid series saturated aliphatic polyester polyol, and the molecular weight of the polyester polyol is 2000-5000;
the chain extender comprises 2, 3-dihydroxypropanesulfonic acid amine and also comprises any one or more of ethylene glycol, ethanolamine and 3,3 '-dichloro-4, 4' -diaminodiphenylmethane; wherein the 2, 3-dihydroxypropanesulfonic acid amine is added in an amount of at least 1/6 based on the total weight of the chain extender.
2. The spray type polyurethane waterproof coating according to claim 1, characterized in that the weight parts of the raw materials are respectively: 141-157 parts of polyether polyol; 10-15 parts of polyester polyol; 45-60 parts of isocyanate; 15-20 parts of a solvent; 9-10.8 parts of pigment; 10-12 parts of a filler; 1.5-2.5 parts of a chain extender; 0.9-1 part of defoaming agent; 1.6-1.8 parts of thixotropic agent; 0.4-0.5 part of dispersant; 0.15-0.3 part of catalyst.
3. The spray type polyurethane waterproof coating according to claim 1, characterized in that the weight parts of the raw materials are respectively: 157 parts of polyether polyol; 10 parts of polyester polyol; 60 parts of isocyanate; 15 parts of a solvent; 9 parts of a pigment; 12 parts of a filler; 1.5 parts of a chain extender; 1 part of a defoaming agent; 1.8 parts of a thixotropic agent; 0.5 part of a dispersant; 0.15 part of catalyst.
4. The spray type polyurethane waterproof coating material as claimed in claim 1, wherein the polyether polyol is any one or more of polyoxypropylene polyol, vinyl polymer graft polyether polyol and polytetrahydrofuran polyol, and the molecular weight of the polyether polyol is 500-8000.
5. The spray polyurethane waterproofing paint according to claim 1, wherein the isocyanate is any one or two of toluene diisocyanate, diphenylmethane diisocyanate and isophorone diisocyanate; and the ratio of the molar amount of-NCO contained in the isocyanate to the total molar amount of-OH contained in the polyether polyol and the polyester polyol is 4-4.5: 1.
6. The spray type polyurethane waterproof paint according to claim 1, wherein the solvent is any one of dimethylformamide, 100# solvent oil, 150# solvent oil and 180# solvent oil;
the defoaming agent is an organic silicon defoaming agent;
the thixotropic agent is any one or more of polyamide wax, organic bentonite and fumed silica;
the dispersant is an environment-friendly dispersant;
the catalyst is an organic tin catalyst and/or a tertiary amine catalyst; the organic tin catalyst is stannous octoate and/or dibutyltin dilaurate; the tertiary amine catalyst is dimorpholinyl diethyl ether and/or triethylene diamine.
7. The spray-applied polyurethane waterproof paint according to claim 1, wherein the pigment is carbon black and/or rutile type titanium dioxide; the filler is any one or more of heavy calcium carbonate, nano calcium carbonate and organic bentonite.
8. The method for preparing a spray type polyurethane waterproofing paint according to any one of claims 1 to 7, comprising the steps of:
s1, blending according to the proportion;
s2, adding polyether polyol, polyester polyol, a thixotropic agent, a dispersing agent and a defoaming agent into a reaction kettle, uniformly stirring, and keeping the temperature of the reaction kettle at 110-120 ℃ during stirring; continuously adding the pigment and the filler, uniformly stirring, and then carrying out vacuum dehydration for 1-2h under the vacuum degree of lower than-0.09 MPa to obtain a premix;
s3, after the dehydration is finished, closing the vacuum pump, cooling to 65-70 ℃, adding isocyanate and partial solvent into the reaction kettle, keeping the temperature of the reaction kettle at 65-70 ℃, and stirring for reaction for 2-3 hours;
s4, adding a catalyst into the reaction kettle, and stirring and reacting for 1-2 hours at the temperature of 65-70 ℃ in the reaction kettle;
s5, adding a chain extender and the rest solvent after the reaction is finished, and stirring and reacting for 0.5-1h while keeping the temperature of the reaction kettle at 65-70 ℃;
and S6, opening a vacuum pump, defoaming for 0.4-0.8h in vacuum at the vacuum degree of lower than-0.09 MPa, then closing the vacuum pump, and finishing the reaction to obtain the spray-coating type high-performance polyurethane waterproof coating.
9. The method for preparing spray type polyurethane waterproofing paint according to claim 8, wherein the solvent is added in the amount of 40-60% by weight based on the total weight of the solvent in the step S3.
10. The construction method of spray type polyurethane waterproofing paint according to any one of claims 1 to 7, characterized by comprising the steps of:
(1) performing shot blasting treatment on the uneven part and the loose surface layer of the base layer to ensure that the surface of the base layer is flat and has no phenomena of sanding and peeling; sweeping away dust on the base surface and flushing the base surface to ensure that the base surface has no floating dust or impurities;
(2) spraying with a spray gun at 15-35 deg.C and 45-75% relative humidity; during spraying operation, the spray gun is perpendicular to the spraying base layer, the distance between the spray gun and the spraying base layer is 48-52cm, the spray gun is moved at a constant speed of 30-60cm/s, and the spray gun is sprayed in a criss-cross mode until the thickness of a coating film is 1.0-1.5 mm.
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| CN116656224A (en) * | 2023-06-01 | 2023-08-29 | 深圳市德固新材料科技有限公司 | High-viscosity waterproof coating and preparation method and application thereof |
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Application publication date: 20220412 |