CN115678413A - Double-component polyurethane waterproof paint and preparation method thereof - Google Patents
Double-component polyurethane waterproof paint and preparation method thereof Download PDFInfo
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- CN115678413A CN115678413A CN202211117117.9A CN202211117117A CN115678413A CN 115678413 A CN115678413 A CN 115678413A CN 202211117117 A CN202211117117 A CN 202211117117A CN 115678413 A CN115678413 A CN 115678413A
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 37
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000003973 paint Substances 0.000 title claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 38
- 238000000576 coating method Methods 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 34
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 18
- 229920000570 polyether Polymers 0.000 claims abstract description 18
- 239000004014 plasticizer Substances 0.000 claims abstract description 16
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 12
- 239000002904 solvent Substances 0.000 claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 9
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000012948 isocyanate Substances 0.000 claims abstract description 9
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 9
- 229920005862 polyol Polymers 0.000 claims abstract description 8
- 150000003077 polyols Chemical class 0.000 claims abstract description 8
- 239000013008 thixotropic agent Substances 0.000 claims abstract description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 17
- 230000018044 dehydration Effects 0.000 claims description 15
- 238000006297 dehydration reaction Methods 0.000 claims description 15
- 238000007872 degassing Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000009849 vacuum degassing Methods 0.000 claims description 9
- 239000012752 auxiliary agent Substances 0.000 claims description 8
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- ZFOZVQLOBQUTQQ-UHFFFAOYSA-N Tributyl citrate Chemical compound CCCCOC(=O)CC(O)(C(=O)OCCCC)CC(=O)OCCCC ZFOZVQLOBQUTQQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000002518 antifoaming agent Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 150000002009 diols Chemical class 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- 239000003921 oil Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 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 3
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- VYKXQOYUCMREIS-UHFFFAOYSA-N methylhexahydrophthalic anhydride Chemical group C1CCCC2C(=O)OC(=O)C21C VYKXQOYUCMREIS-UHFFFAOYSA-N 0.000 claims description 3
- MCTWTZJPVLRJOU-UHFFFAOYSA-N 1-methyl-1H-imidazole Chemical compound CN1C=CN=C1 MCTWTZJPVLRJOU-UHFFFAOYSA-N 0.000 claims description 2
- PISLZQACAJMAIO-UHFFFAOYSA-N 2,4-diethyl-6-methylbenzene-1,3-diamine Chemical compound CCC1=CC(C)=C(N)C(CC)=C1N PISLZQACAJMAIO-UHFFFAOYSA-N 0.000 claims description 2
- JTXMVXSTHSMVQF-UHFFFAOYSA-N 2-acetyloxyethyl acetate Chemical compound CC(=O)OCCOC(C)=O JTXMVXSTHSMVQF-UHFFFAOYSA-N 0.000 claims description 2
- 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
- MWSKJDNQKGCKPA-UHFFFAOYSA-N 6-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1CC(C)=CC2C(=O)OC(=O)C12 MWSKJDNQKGCKPA-UHFFFAOYSA-N 0.000 claims description 2
- DICUPLXUNISGAQ-UHFFFAOYSA-N Isooctyl acetate Chemical compound CC(C)CCCCCOC(C)=O DICUPLXUNISGAQ-UHFFFAOYSA-N 0.000 claims description 2
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 2
- 239000004677 Nylon 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
- 239000002253 acid Substances 0.000 claims description 2
- 239000000440 bentonite Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- 239000004359 castor oil Substances 0.000 claims description 2
- 235000019438 castor oil Nutrition 0.000 claims description 2
- 229910021485 fumed silica Inorganic materials 0.000 claims description 2
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 2
- OJURWUUOVGOHJZ-UHFFFAOYSA-N methyl 2-[(2-acetyloxyphenyl)methyl-[2-[(2-acetyloxyphenyl)methyl-(2-methoxy-2-oxoethyl)amino]ethyl]amino]acetate Chemical compound C=1C=CC=C(OC(C)=O)C=1CN(CC(=O)OC)CCN(CC(=O)OC)CC1=CC=CC=C1OC(C)=O OJURWUUOVGOHJZ-UHFFFAOYSA-N 0.000 claims description 2
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920006389 polyphenyl polymer Polymers 0.000 claims description 2
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 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
- APVVRLGIFCYZHJ-UHFFFAOYSA-N trioctyl 2-hydroxypropane-1,2,3-tricarboxylate Chemical compound CCCCCCCCOC(=O)CC(O)(C(=O)OCCCCCCCC)CC(=O)OCCCCCCCC APVVRLGIFCYZHJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000001993 wax Substances 0.000 claims description 2
- 238000004078 waterproofing Methods 0.000 claims 9
- 238000000034 method Methods 0.000 claims 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims 2
- 241000276489 Merlangius merlangus Species 0.000 claims 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- BXQLKGJCLJZZOP-UHFFFAOYSA-N methylsulfanylmethane;toluene Chemical compound CSC.CC1=CC=CC=C1 BXQLKGJCLJZZOP-UHFFFAOYSA-N 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 239000000654 additive Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000011527 polyurethane coating Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 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 description 1
- AOFIWCXMXPVSAZ-UHFFFAOYSA-N 4-methyl-2,6-bis(methylsulfanyl)benzene-1,3-diamine Chemical compound CSC1=CC(C)=C(N)C(SC)=C1N AOFIWCXMXPVSAZ-UHFFFAOYSA-N 0.000 description 1
- 241001112258 Moca Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 description 1
- 238000006757 chemical reactions by type Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002426 superphosphate Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
The invention belongs to the field of waterproof coatings, and particularly relates to a bi-component polyurethane waterproof coating and a preparation method thereof. The component A comprises: polyether polyol, a first plasticizer and isocyanate; the component B comprises: the adhesive comprises a second plasticizer, a first curing agent, a second curing agent, heavy calcium carbonate, talcum powder, a solvent, a thixotropic agent and a catalyst. After the two-component polyurethane waterproof coating is coated or sprayed, the bonding strength of the waterproof layer and the base layer can reach more than 2.0MPa, which is far more than the requirement that the bonding strength specified by the national standard is more than or equal to 1.0 MPa.
Description
Technical Field
The invention belongs to the field of waterproof coatings, and particularly relates to a bi-component polyurethane waterproof coating and a preparation method thereof.
Background
The polyurethane waterproof coating belongs to a chemical reaction type waterproof coating, and a flexible and seamless rubber waterproof membrane is formed after curing and forming, so the polyurethane waterproof coating is called as a liquid coiled material in the industry due to the excellent comprehensive performance. The polyurethane waterproof coating is divided into a single-component polyurethane waterproof coating and a two-component polyurethane waterproof coating according to the composition and the curing mechanism of the polyurethane waterproof coating. The two-component polyurethane waterproof coating is widely applied due to higher cost performance.
Because the two components of the two-component polyurethane waterproof coating are solidified into a film through chemical reaction, the length of the whole reaction time has decisive influence on the project construction period, and the solidification reaction time needs to be shortened on the premise of ensuring various index performances of the material; because the bonding property of the double-component polyurethane waterproof coating on the market at present is not ideal and basically lingers around 1.0MPa specified by the national standard, the bonding property of the double-component polyurethane waterproof coating needs to be improved to prolong or improve the service life of the material, and the advantages of the polyurethane waterproof coating are truly embodied.
Disclosure of Invention
The invention aims to solve the problems and provides a two-component polyurethane waterproof coating and a preparation method thereof.
The first aspect of the invention provides a two-component polyurethane waterproof coating, which comprises a component A and a component B,
the component A comprises: 60-80 parts of polyether polyol, 12-19 parts of first plasticizer and 10-14 parts of isocyanate;
the component B comprises: 30-38 parts of second plasticizer, 3-4 parts of first curing agent, 0.1-0.3 part of second curing agent, 40-50 parts of triple superphosphate, 4-10 parts of talcum powder, 5-7 parts of solvent, 0.2-0.35 part of thixotropic agent, 0.1-0.4 part of catalyst and 0-1 part of other auxiliary agent;
the first curing agent is selected from at least one of methylene bis-o-chloroaniline, diethyl toluenediamine and dimethyl thio toluenediamine;
the second curing agent is methyl hexahydrophthalic anhydride and/or methyl tetrahydrophthalic anhydride.
In the invention, the component A is a prepolymer, the component B is a curing agent, the component A and the component B are uniformly mixed according to a certain mass ratio (generally 1-3) and then coated on a base layer, and a certain flexible and seamless integral waterproof layer is formed through chemical reaction between effective components in the component A and the component B, so that the waterproof effect of the base layer is achieved.
In the invention, a first curing agent and a second curing agent are selected for compounding, and the first curing agent exerts the curing performance of the first curing agent; the second curing agent not only exerts the curing performance of the second curing agent, but also ensures that the obtained bi-component polyurethane waterproof coating and the base layer have the bonding strength of more than or equal to 2MPa, which is far more than the requirement that the bonding strength specified by the national standard is more than or equal to 1.0MPa, because the property of the cured polymer depends on the performance of the curing agent, and the cured polyurethane coating has better stability because the molecular structure of the second curing agent does not contain double bonds; the polyurethane generated by the reaction of the second curing agent and the prepolymer has higher crosslinking degree, so that molecular chains have more three-dimensional network structures, and the bonding strength of the polyurethane coating is improved. Meanwhile, the polyurethane generated by curing the second curing agent has the characteristic of higher heat distortion temperature, so that the curing time required in the whole drying process is shorter.
According to the present invention, other additives may be added as needed, and preferably, the other additives include at least one of a dispersant, a defoamer, and a leveling agent. When other additives are required, the amount thereof to be added is preferably 0.4 to 1 part by weight. As a further preferable mode, the weight ratio of the dispersing agent, the defoaming agent and the leveling agent is 1: (0.6-1): (0.3-0.8).
Preferably, the polyether polyol is at least one selected from polyether diol and polyether triol.
As a further preferable scheme, the average molecular weight of the polyether diol is 1000-3000, and the hydroxyl value is 50-60mg KOH/g.
As a further preferred embodiment, the polyether triol has an average molecular weight of 4000 to 5000 and a hydroxyl number of 30 to 39mg KOH/g.
Preferably, the first plasticizer and the second plasticizer are respectively selected from at least one of tributyl citrate, trioctyl citrate, 52# chlorinated paraffin and nylon acid dimethyl ester.
Preferably, the isocyanate is at least one selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate and polyphenyl polymethylisocyanate.
Preferably, the mesh number of the heavy calcium is 600-1000; the heavy calcium has filling effect.
As a preferred scheme, the mesh number of the talcum powder is 1000-1500; the talcum powder has the functions of tackifying and preventing settling.
Preferably, the solvent is at least one selected from isooctyl acetate, ethylene glycol diacetate, dearomatized environment-friendly chemical solvent oil D70 and dearomatized environment-friendly chemical solvent oil D90.
Preferably, the thixotropic agent is selected from at least one of bentonite, fumed silica, polyamide wax and hydrogenated castor oil.
Preferably, the catalyst is at least one selected from the group consisting of dibutyltin dilaurate, stannous octoate, triethylamine, tetramethylethylenediamine and N-methylimidazole.
The second aspect of the present invention provides a preparation method of the above two-component polyurethane waterproof coating, which comprises:
the preparation method of the component A comprises the following steps:
step A1: mixing and stirring polyether polyol and a first plasticizer, and then carrying out reduced pressure dehydration;
step A2: controlling the water content of the system to be less than or equal to 500ppm under normal pressure;
step A3: adding isocyanate to react;
step A4: after the reaction in the step A3 is finished, heating to continue the reaction;
step A5: after the reaction in the step A4 is finished, cooling and degassing to obtain a component A;
the preparation method of the component B comprises the following steps:
step B1: stirring the second plasticizer and optional other auxiliary agents;
and step B2: adding a first curing agent, heavy calcium carbonate, talcum powder and a thixotropic agent, mixing and stirring, and performing reduced pressure dehydration;
and step B3: controlling the water content of the system to be less than or equal to 500ppm under normal pressure;
and step B4: adding a catalyst, a second curing agent and a solvent, and stirring under a micro-positive pressure state;
and step B5: and (4) degassing under reduced pressure to obtain a component B.
Preferably, in the step A1, the temperature of the system is controlled to be 110-115 ℃, the vacuum condition of reduced pressure dehydration is-0.085 to-0.1 MPa, and the time of reduced pressure dehydration is 1-2h.
Preferably, in the step A2, the temperature is reduced to 55-65 ℃ after the water content of the system under normal pressure is controlled to be less than or equal to 500 ppm.
Preferably, in the step A3, the reaction temperature is 70-76 ℃, and the reaction time is 1-2h.
Preferably, in the step A4, the temperature after temperature rise is 83-88 ℃, and the time for continuing the reaction is 1-2h.
Preferably, in the step A5, the temperature is reduced to 45-55 ℃ for degassing, the vacuum condition of degassing is-0.075-0.085 MPa, and the degassing time is 0.5-1h.
Preferably, in step B1, the temperature of the system after stirring is controlled to be 100 to 105 ℃.
Preferably, in the step B2, the temperature of the stirred system is controlled to be 105-110 ℃, the vacuum condition of the reduced pressure dehydration is-0.085-0.1 MPa, and the time of the reduced pressure dehydration is 1-2h.
Preferably, in the step B3, after the water content of the system under normal pressure is controlled to be less than or equal to 500ppm, the temperature of the system is controlled to be 65-75 ℃.
Preferably, in the step B4, the temperature is 68-72 ℃ in a micro-positive pressure state, and the stirring time is 0.4-0.6h.
Preferably, in the step B5, the system temperature is controlled to be reduced to below 55 ℃ for vacuum degassing, the vacuum condition of the vacuum degassing is-0.075 to-0.085 MPa, and the time of the vacuum degassing is 0.5 to 1 hour.
The invention has the beneficial effects that:
1. after the two-component polyurethane waterproof coating is coated or sprayed, the bonding strength of the waterproof layer and the base layer can reach more than 2.0MPa, which is far more than the requirement that the bonding strength specified by the national standard is more than or equal to 1.0 MPa.
2. After the two-component polyurethane waterproof paint is coated or sprayed, the drying speed is very high, the two-component polyurethane waterproof paint can be dried for the second construction within 2 hours at normal temperature, and the construction progress is greatly improved.
3. The two-component polyurethane waterproof coating has higher bonding strength, so that the capability of reducing cracks or fissures of buildings caused by foundation settlement of the buildings can be realized.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by 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.
In the examples of the present invention, the sources of the respective raw materials are shown in Table 1.
TABLE 1
| Raw material | Manufacturer of the product | Number plate |
| Polyether diol | Wanhua chemistry | C2020 |
| Polyether triol | Wanhua chemistry | F3135 |
| Isocyanates | Basf-Fr | T80 |
| Defoaming agent | Effkona | 2024 |
| Leveling agent | Effkona | 3663 |
| MOCA | Binhai Ming Gao | II |
| Heavy calcium carbonate | omega-Miya | 800 mesh |
| Methyl hexahydrophthalic anhydride | Puyang hucheng (Puyang brand food) | Auxiliary agent |
| Dibutyl tin dilaurate | Tianjin Akuli | Auxiliary agent |
Table 2 shows the specific amounts of the A component and the B component in each example.
TABLE 2
The preparation method of the component A comprises the following steps:
step A1: mixing and stirring polyether polyol and a first plasticizer, and then carrying out reduced pressure dehydration; controlling the temperature of the system at 110 ℃, the vacuum condition of reduced pressure dehydration at-0.1 MPa, and the time of reduced pressure dehydration at 1.5h;
step A2: controlling the water content of the system to be less than or equal to 500ppm under normal pressure, and cooling to 60 ℃;
step A3: adding isocyanate to react; the reaction temperature is 73 ℃, and the reaction time is 1.5h;
step A4: after the reaction in the step A3 is finished, heating to continue the reaction; the temperature after the temperature rise is 85 ℃, and the time for continuing the reaction is 1.5h;
step A5: after the reaction in the step A4 is finished, cooling to 50 ℃ for degassing, wherein the vacuum condition of degassing is-0.08 MPa, and the degassing time is 1h to obtain a component A;
the preparation method of the component B comprises the following steps:
step B1: stirring the second plasticizer and optional other auxiliary agents, and controlling the temperature of the stirred system to be 102 ℃;
and step B2: adding a first curing agent, heavy calcium carbonate, talcum powder and a thixotropic agent, mixing and stirring, controlling the temperature of the stirred system to be 108 ℃, and decompressing and dehydrating for 1.5 hours under-0.1 MPa;
and step B3: controlling the temperature of the system to be 70 ℃ after controlling the water content of the system to be less than or equal to 500ppm under normal pressure;
and step B4: adding catalyst, second curing agent and solvent, and stirring at 70 deg.C under micro-positive pressure for 0.5h;
and step B5: and (3) controlling the temperature of the system to be reduced to below 55 ℃ for vacuum degassing, wherein the vacuum condition of the vacuum degassing is-0.08 MPa, and the time of the vacuum degassing is 0.6h, so as to obtain the component B.
The finished two-component polyurethane waterproof coating prepared in each example and each comparative example (the mass ratio of the component A to the component B is 1.
TABLE 3
With reference to the table 3, it is shown,
for the tack-free time: the second curing agent added in the examples has the characteristic of higher heat distortion temperature, so the surface drying time of the examples is shorter than that of the comparative example.
For the actual dry time: the second curing agent added in the embodiment can also react with the prepolymer, has the characteristic of higher heat distortion temperature, and is matched with the catalyst to catalyze the whole reaction process, so the time for drying is shorter than the time for comparison.
For tensile strength: the second curing agent added in the embodiment can react and crosslink with the prepolymer to form a molecular structure with a three-dimensional net shape, so that the strength of the polyurethane coating is enhanced, and the tensile strength of the embodiment is superior to that of a comparative example; the examples are added with the second curing agent, so that the tensile strength difference among the examples is not obvious.
For elongation at break: since the tensile strength of the examples is not greatly different from that of the comparative examples, the materials in nature are either rigid or tough, and cannot be made rigid and flexible. Therefore, in the case where the tensile strength of the examples and comparative examples was not changed much, the elongation with respect to toughness was not significant.
For the bond strength: because the second curing agent is added in the embodiment, the drying speed of the surface drying is higher, the coating can be quickly cured and improved in strength after wetting the base layer and penetrating into the pores of the base layer, and then the coating cannot be shrunk and separated from the pores of the base layer because the strength is not timely improved after the material is cured, so that the coating can be fully meshed with the pores of the base layer, the coating can firmly hold the base layer, and the tensile strength of the embodiment added with the second curing agent is better than that of the comparative example, so that the bonding strength of the embodiment is obviously higher than that of the comparative example.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A double-component polyurethane waterproof coating is characterized by comprising a component A and a component B,
the component A comprises: 60-80 parts of polyether polyol, 12-19 parts of first plasticizer and 10-14 parts of isocyanate;
the component B comprises: 30-38 parts of second plasticizer, 3-4 parts of first curing agent, 0.1-0.3 part of second curing agent, 40-50 parts of heavy calcium carbonate, 4-10 parts of talcum powder, 5-7 parts of solvent, 0.2-0.35 part of thixotropic agent, 0.1-0.4 part of catalyst and 0-1 part of other auxiliary agent;
the first curing agent is at least one selected from methylene bis-o-chloroaniline, diethyl toluene diamine and dimethyl sulfur toluene diamine;
the second curing agent is methyl hexahydrophthalic anhydride and/or methyl tetrahydrophthalic anhydride.
2. The two-component polyurethane waterproofing coating according to claim 1,
the other auxiliary agent comprises at least one of a dispersant, a defoaming agent and a flatting agent;
preferably, the weight ratio of the dispersing agent to the defoaming agent to the leveling agent is 1: (0.6-1): (0.3-0.8).
3. The two-component polyurethane waterproofing coating according to claim 1,
the polyether polyol is selected from at least one of polyether diol and polyether triol;
preferably, the first and second electrodes are formed of a metal,
the average molecular weight of the polyether glycol is 1000-3000, and the hydroxyl value is 50-60mg KOH/g;
the polyether triol has an average molecular weight of 4000-5000 and a hydroxyl value of 30-39mg KOH/g.
4. The two-component polyurethane waterproofing coating according to claim 1,
the first plasticizer and the second plasticizer are respectively selected from at least one of tributyl citrate, trioctyl citrate, 52# chlorinated paraffin and nylon acid dimethyl ester.
5. The two-component polyurethane waterproofing coating according to claim 1,
the isocyanate is selected from at least one of toluene diisocyanate, diphenylmethane diisocyanate and polyphenyl polymethylisocyanate.
6. The two-component polyurethane waterproofing coating material according to claim 1,
the mesh number of the coarse whiting is 600-1000;
the mesh number of the talcum powder is 1000-1500.
7. The two-component polyurethane waterproofing coating according to claim 1,
the solvent is at least one selected from isooctyl acetate, ethylene glycol diacetate, dearomatization environment-friendly chemical solvent oil D70 and dearomatization environment-friendly chemical solvent oil D90;
the thixotropic agent is selected from at least one of bentonite, fumed silica, polyamide wax and hydrogenated castor oil;
the catalyst is at least one of dibutyltin dilaurate, stannous octoate, triethylamine, tetramethylethylenediamine and N-methylimidazole.
8. The method for preparing the two-component polyurethane waterproofing paint according to any of claims 1 to 7, characterized in that the method comprises:
the preparation method of the component A comprises the following steps:
step A1: mixing and stirring polyether polyol and a first plasticizer, and then carrying out reduced pressure dehydration;
step A2: controlling the water content of the system to be less than or equal to 500ppm under normal pressure;
step A3: adding isocyanate to react;
step A4: after the reaction in the step A3 is finished, heating to continue the reaction;
step A5: after the reaction in the step A4 is finished, cooling and degassing to obtain a component A;
the preparation method of the component B comprises the following steps:
step B1: stirring the second plasticizer and optional other auxiliary agents;
and step B2: adding a first curing agent, heavy calcium carbonate, talcum powder and a thixotropic agent, mixing and stirring, and performing reduced pressure dehydration;
and step B3: controlling the water content of the system to be less than or equal to 500ppm under normal pressure;
and step B4: adding a catalyst, a second curing agent and a solvent, and stirring under a micro-positive pressure state;
and step B5: degassing under reduced pressure to obtain a component B.
9. The method for preparing two-component polyurethane waterproofing paint according to claim 8,
in the step A1, the temperature of the system is controlled to be 110-115 ℃, the vacuum condition of reduced pressure dehydration is-0.085 to-0.1 MPa, and the time of reduced pressure dehydration is 1-2h;
in the step A2, after the water content of the system under normal pressure is controlled to be less than or equal to 500ppm, the temperature is reduced to 55-65 ℃;
in the step A3, the reaction temperature is 70-76 ℃, and the reaction time is 1-2h;
in the step A4, the temperature after the temperature rise is 83-88 ℃, and the time for continuing the reaction is 1-2h;
in the step A5, the temperature is reduced to 45-55 ℃ for degassing, the vacuum condition of degassing is-0.075-0.085 MPa, and the degassing time is 0.5-1h.
10. The method for preparing two-component polyurethane waterproofing paint according to claim 8,
in the step B1, controlling the temperature of the system after stirring to be 100-105 ℃;
in the step B2, the temperature of the system after stirring is controlled to be 105-110 ℃, the vacuum condition of reduced pressure dehydration is-0.085 to-0.1 MPa, and the time of reduced pressure dehydration is 1-2h;
in the step B3, after the water content of the system under normal pressure is controlled to be less than or equal to 500ppm, the temperature of the system is controlled to be 65-75 ℃;
in the step B4, the temperature is 68-72 ℃ in a micro-positive pressure state, and the stirring time is 0.4-0.6h;
and in the step B5, the temperature of the system is controlled to be reduced to below 55 ℃ for vacuum degassing, the vacuum condition of the vacuum degassing is-0.075 to-0.085 MPa, and the time of the vacuum degassing is 0.5 to 1 hour.
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| CN118995032A (en) * | 2024-08-28 | 2024-11-22 | 河北金诺防水材料有限公司 | Modified polyurethane waterproof paint capable of being quickly solidified in water and preparation process |
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| CN115678413B (en) | 2023-08-04 |
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