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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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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| CN117025080A (en) * | 2023-08-07 | 2023-11-10 | 德州科顺建筑材料有限公司 | Polyurethane waterproof coating and preparation method thereof |
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