CN113980554B - Moisture-coating anti-condensation heat-insulation coating and preparation method thereof - Google Patents
Moisture-coating anti-condensation heat-insulation coating and preparation method thereof Download PDFInfo
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- CN113980554B CN113980554B CN202111368057.3A CN202111368057A CN113980554B CN 113980554 B CN113980554 B CN 113980554B CN 202111368057 A CN202111368057 A CN 202111368057A CN 113980554 B CN113980554 B CN 113980554B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
Abstract
The moisture-coatable anti-condensation heat-insulation coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 2-3, the component A comprises 45-55% of epoxy resin, 40-50% of modified hollow microspheres and modified SiO2 aerogel mixed filler, 5% of diluent and 5% of solvent; the component B comprises 50-70% of amine curing agent, 5-15% of diluent, 5-15% of solvent and 5-10% of drier, wherein the drier selects DMP-30, m-phenylenediamine addition compound and polymer with micromolecular polar groups. The nucleophilicity of the lone pair electrons in the micromolecular polar group polymer promotes the attack on the epoxy group in the epoxy resin, thereby promoting the polymerization and curing of the epoxy resin, playing a promoting role and improving the curing rate. In addition, the micromolecule polar hydrophilic group can bring the condensed water to the surface of the coating, accelerate the drying inside the coating and prevent external water vapor from permeating.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a moisture-coatable anti-condensation heat-insulation coating and a preparation method thereof.
Background
Under certain temperature and pressure, when the temperature of the medium in the pipeline is lower than the ambient temperature and the temperature difference reaches a certain value, the outer surface of the pipeline or the valve is subjected to condensation. The surface condensation has certain influence on the safe operation of the pipeline, such as corrosion of metal components of the pipeline, and long-term water accumulation causes inconvenience for maintenance and operation personnel. In the field of anti-condensation coating, a large amount of porous water absorbent or a small amount of emulsified organic metal soap drier is added into the water-based anti-condensation coating to accelerate the curing rate, but water is still adsorbed in a coating film, so that the coating film is not easy to dry and discharge, the adverse effect of sagging or dripping of the coating film is brought, and the risk of corrosion under an insulating layer is brought to a metal structure.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: to provide a moisture-coatable moisture-condensation-proof heat-insulating coating material which can improve the curing rate of the coating material and the hydrophobicity of the coating material.
The technical scheme adopted by the invention for solving the technical problem is as follows: the moisture-coatable anti-condensation heat-insulation coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is (2-3); the component B comprises 50-70% of amine curing agent, 5-15% of diluent, 5-15% of solvent and 5-10% of drier, wherein the drier selects DMP-30, m-phenylenediamine addition compound and polymer with small molecular polar groups.
Furthermore, the epoxy resin in the component A is selected from one of E44 or E51.
Further, the modified hollow microspheres are modified by adopting a silane coupling agent KH550 or KH560 or a silane prepolymer, wherein the particle size of the hollow microspheres is 20-80 mu m, and the density is 0.35-0.50 g/cm 3 。
Further, silane coupling agents KH550 or KH560 with different concentrations or silane prepolymers are added into the modified SiO2 aerogel through a chemical modification method to modify the SiO2 aerogel, wherein the SiO2 aerogel is hydrophobic aerogel powder with the particle size of 15-50 mu m, the pore diameter of 20-50 nm and the thermal conductivity of less than 0.018W/(m.K).
Furthermore, the solvent in the component A is one or more of propylene glycol methyl ether or acetone.
Furthermore, the polymer of the micromolecular polar group in the component B is micromolecular polysulfide rubber containing a terminal sulfydryl.
Further, the amine curing agent is one or more of cashew nut shell oil modified phenolic aldehyde amine, phenolic aldehyde amine NX2003, NC558 and ketimine addition product.
Further, a preparation method of the coating comprises the following steps:
sequentially adding the epoxy resin, the diluent, the solvent, the modified hollow microspheres and the modified SiO2 aerogel slurry into a stirrer according to the proportion, adjusting the rotating speed to be 500-600 r/min, and stirring for 30min to obtain a component A;
adding the amine curing agent, the diluent, the solvent, the drier and the like into a stirrer in sequence according to the proportion, adjusting the rotating speed to be 1000-1200 r/min, and stirring for 10-20 min to obtain a component B;
and mixing the component A and the component B according to the mass ratio, and manually stirring uniformly to obtain the moisture-coating anti-condensation heat-insulation coating.
The invention has the beneficial effects that:
the nucleophilicity of lone pair electrons in the micromolecular polar group polymer promotes to attack epoxy groups in the epoxy resin, and oxygen anions formed after the ring opening of the epoxy groups can further react with the epoxy groups, so that the polymerization and curing of the epoxy resin are promoted, the promotion effect is achieved, and the curing rate is improved. In addition, the micromolecule polar hydrophilic group can bring the condensed water to the surface of the coating, so that the drying inside the coating is accelerated, the hydrophobicity of the surface of the coating is improved along with the acceleration of the curing process, and the external water vapor is prevented from permeating.
Detailed Description
In order to make the technical solution of the present invention clearer, the following description will be made with reference to embodiments. The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments that can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort fall within the scope of the present invention.
Example 1
Moisture-coatable anti-condensation partition in this embodimentA thermal coating comprising the following components: the component A comprises 45-55% of epoxy resin, 40-50% of modified hollow microspheres and modified SiO 2 Aerogel mixed filler, 5% of diluent and 5% of solvent; the component B comprises 50 to 70 percent of amine curing agent, 5 to 15 percent of diluent, 5 to 15 percent of solvent and 5 to 10 percent of drier; wherein the epoxy resin is selected from one of E44 or E51; the solvent in the component A is propylene glycol monomethyl ether or acetone; the diluent in the component A is one or more of C12-C15 glycidyl ether and benzyl alcohol.
The modified hollow microsphere adopts silane coupling agent KH550 or KH560 or silane prepolymer to treat the hollow microsphere, wherein the hollow microsphere has a particle size of 20-80 μm and a density of 0.35-0.50 g/cm 3 (ii) a The hollow microspheres can block the air heat conduction process, further play a role in heat insulation, reduce the temperature difference between the inside and the outside and prevent condensation; the modified hollow microspheres can be stably dispersed in an epoxy resin system, improve the compatibility with epoxy resin, have a toughening effect on the epoxy system, and improve the hardness of the cured coating. Modified SiO 2 The aerogel is added with silane coupling agents KH550 or KH560 or silane prepolymers with different concentrations by a chemical modification method, so that micromolecular groups are grafted on the surface of the aerogel, the dispersion effect of aerogel powder in resin is improved, the interface effect is reduced, and the binding force is increased. Wherein SiO is 2 The aerogel is hydrophobic aerogel powder with the grain diameter of 15-50 mu m, the pore diameter of 20-50 nm and the heat conductivity coefficient of less than 0.018W/(m.K). Modified cenosphere and modified SiO 2 In the mixed filler of the nano aerogel, the added mass fraction of the modified hollow microspheres is 40-50 percent, and the modified SiO is 2 The mass fraction of aerogel is 5-10%.
The amine curing agent in the component B is a modified amine curing agent, such as cashew nut shell oil modified phenolic aldehyde amine or phenolic aldehyde amine NX2003, NC558, ketimine addition product and the like; preferred are such curing agents that cure epoxy resins in the presence of moisture or water, cure rapidly at low temperatures, and have low tolerance to substrate handling; the solvent in the component B is propylene glycol monomethyl ether or acetone;
the drier selects DMP-30 or m-phenylenediamine addition product or polymer with small molecular polar group, wherein the polymer with small molecular polar group is preferably polysulfide rubber with small molecule containing end sulfhydryl. The nucleophilicity of lone pair electrons in the preferable small-molecule polar group polymer promotes the attack of epoxy groups, and oxygen anions formed after the ring opening of the epoxy groups can further react with the epoxy groups, so that the polymerization and curing of the epoxy resin are promoted, the promotion effect is achieved, and the curing rate is improved. In addition, the micromolecule polar hydrophilic group can bring the condensed water to the surface of the coating, so that the drying inside the coating is accelerated, the hydrophobicity of the surface of the coating is improved along with the acceleration of the curing process, and the external water vapor is prevented from permeating.
The moisture-coatable anti-condensation heat-insulation coating of the embodiment is prepared by the following steps:
45 percent of epoxy resin E51, 5 percent of benzyl alcohol, 5 percent of propylene glycol methyl ether, 40 percent of modified hollow glass microspheres and 5 percent of modified SiO by mass 2 Adding the aerogel slurry into a stirrer, adjusting the rotating speed to be 500-600 r/min, and stirring for 30min to obtain a component A for later use.
Adding NX2003 with the mass ratio of 70%, benzyl alcohol with the mass ratio of 10%, propylene glycol methyl ether with the mass ratio of 10%, micromolecular polar group polymer with the mass ratio of 10% and the like into a stirrer in sequence according to the mixture ratio, adjusting the rotating speed to be 1000-1200 r/min, and stirring for 10-20 min to obtain a component B for later use.
Before use, the components A and B are mixed according to the mass ratio of 2:1, mixing and stirring uniformly by hand to obtain the moisture-coating anti-condensation heat-insulation coating.
Example 2
45 percent of epoxy resin E51, 5 percent of benzyl alcohol, 5 percent of propylene glycol methyl ether, 40 percent of modified hollow glass microspheres and 5 percent of modified SiO by mass 2 Adding the aerogel slurry into a stirrer, adjusting the rotating speed to be 500-600 r/min, and stirring for 30min to obtain a component A for later use.
Adding NX2003 with the mass ratio of 70%, benzyl alcohol with the mass ratio of 10%, propylene glycol methyl ether with the mass ratio of 10%, micromolecular polar group polymer with the mass ratio of 10% and the like into a stirrer in sequence according to the mixture ratio, adjusting the rotating speed to be 1000-1200 r/min, and stirring for 10-20 min to obtain a component B for later use.
Before use, the components A and B are mixed according to the mass ratio of 2.5:1, mixing and stirring evenly by hand to obtain the moisture-coating anti-condensation heat-insulation coating.
Example 3
45 percent of epoxy resin E51, 5 percent of benzyl alcohol, 5 percent of propylene glycol methyl ether, 40 percent of modified hollow glass microballoon and 5 percent of modified SiO by mass ratio 2 Adding the aerogel slurry into a stirrer, adjusting the rotating speed to be 500-600 r/min, and stirring for 30min to obtain a component A for later use.
Adding NX2003 with the mass ratio of 70%, benzyl alcohol with the mass ratio of 10%, propylene glycol methyl ether with the mass ratio of 10%, micromolecule polar group polymer with the mass ratio of 10% and the like into a stirrer in sequence according to the mixture ratio, adjusting the rotating speed to be 1000-1200 r/min, and stirring for 10-20 min to obtain a component B for later use.
Before use, the components A and B are mixed according to the mass ratio of 3:1, mixing and stirring uniformly by hand to obtain the moisture-coating anti-condensation heat-insulation coating.
Comparative example 1
45 percent of epoxy resin E51, 10 percent of benzyl alcohol, 5 percent of propylene glycol methyl ether, 40 percent of unmodified hollow glass microballoon and 5 percent of unmodified SiO by mass 2 Adding the aerogel slurry into a stirrer, adjusting the rotating speed to be 500-600 r/min, and stirring for 30min to obtain a component A for later use.
Adding NX2003 with the mass ratio of 70%, benzyl alcohol with the mass ratio of 10%, propylene glycol methyl ether with the mass ratio of 10%, micromolecule polar group polymer with the mass ratio of 10% and the like into a stirrer in sequence according to the mixture ratio, adjusting the rotating speed to be 1000-1200 r/min, and stirring for 10-20 min to obtain a component B for later use.
Before use, the components A and B are mixed according to the mass ratio of 2:1, mixing and stirring uniformly by hand to obtain the moisture-coating anti-condensation heat-insulation coating.
Comparative example 2
45 percent of epoxy resin E51, 10 percent of benzyl alcohol, 5 percent of propylene glycol methyl ether, 40 percent of modified hollow glass microspheres and 5 percent of modified SiO by mass 2 Adding the aerogel slurry into a stirrer, adjusting the rotating speed to be 500-600 r/min, and stirring for 30min to obtain a component A for later use.
Adding NX2003 with the mass ratio of 70%, benzyl alcohol with the mass ratio of 10%, propylene glycol methyl ether with the mass ratio of 20% and the like into a stirrer in sequence according to the mixture ratio, adjusting the rotating speed to be 1000-1200 r/min, and stirring for 10-20 min to obtain a component B for later use.
Before use, the components A and B are mixed according to the mass ratio of 2:1, mixing and stirring uniformly by hand to obtain the moisture-coating anti-condensation heat-insulation coating.
The coatings prepared in examples 1-3 and comparative examples 1-2 were tested as follows:
the simulated medium temperature is 15 ℃, the ambient temperature is 31 ℃, and a dew liquid film is generated on the surface of the pipeline before the thermal insulation coating is not coated. Before coating construction, a surface liquid film is wiped, and heat insulation coating is coated in a smearing mode, wherein the thickness of the coating is 2mm. Observing whether the coating has sagging or not, the drying time and the anti-condensation effect, and preparing a test plate to measure the heat conductivity coefficient of the coating.
The test results are shown in the following table:
as shown in the table above, the coatings prepared in the examples 1-3 have no obstacle on application and no sagging on thick coating in construction performance, the surface drying time of the examples 1-3 is within 10h, the actual drying time is 24h, the thermal conductivity is below 0.1W/m.K, no bubbling and cracking phenomena exist in water-resistant and salt-fog-resistant tests, and no dewing phenomenon exists on the surface of the coating; the surface dry time of the coating in the comparative example 1 is 12 hours, the coating in the comparative example 2 cannot be dried and sagging occurs, the thermal conductivity of the coating in the comparative example 1 is 0.121W/m.K, the thermal conductivity of the coating in the comparative example 2 is 0.06W/m.K, and the bubbling and cracking phenomena in the comparative example 1 are not generated in the water resistance and the salt spray resistance, the bubbling phenomena in the comparative example 2 occur at 96h and 168h respectively in the water resistance and the salt spray resistance tests, the local condensation phenomenon occurs on the surface of the coating in the comparative example 1, the coating in the comparative example 2 cannot be dried, and the surface condensation occurs.
Examples 1-3 in comparison to comparative example 1, examples have modified cenospheres and modified SiO added to the formulation 2 Mixed filler of nano aerogel, modified hollow microsphere and modified SiO 2 The mixed filler of nanometer aerogel can effectively play thermal-insulated cold insulation effect, prevents that pipeline surface temperature is less than dew point temperature and dewfall. Compared with the comparative example 2, the micromolecular polar group polymer is added in the examples 1-3 to be used as a drier, the nucleophilicity of lone pair electrons in the micromolecular polar group polymer promotes the attack on epoxy groups in the epoxy resin, and after the ring opening of the epoxy groups, the formed oxygen anions can further react with the epoxy groups, so that the polymerization and curing of the epoxy resin are promoted, the promotion effect is achieved, and the curing rate is improved. In addition, the micromolecule polar hydrophilic group can bring the condensed water to the surface of the coating, so that the drying inside the coating is accelerated, the hydrophobicity of the surface of the coating is improved along with the acceleration of the curing process, and the external water vapor is prevented from permeating.
The coating in the embodiment can achieve the advantages of being dry and excellent in corrosion resistance within 24 hours, meets the performance requirements of wet online coating, heat insulation, condensation prevention, corrosion prevention and the like, and is suitable for pipeline equipment facilities such as industrial natural gas condensation.
In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. A moisture-coating anti-condensation heat-insulation coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is (2-3); the component B comprises 50-70% of amine curing agent, 5-15% of diluent, 5-15% of solvent and 5-10% of drier, wherein the drier is DMP-30, m-phenylenediamine adduct and polymer with small molecular polar groups, the polymer with small molecular polar groups is polysulfide rubber containing terminal sulfydryl, the amine curing agent is at least one of phenalkamine NX2003 and NC558, the solvent is at least one of propylene glycol methyl ether or acetone, and the diluent is at least one of C12-C15 glycidyl ether or benzyl alcohol.
2. The moisture coatable dew condensation and thermal insulating coating of claim 1, wherein: the epoxy resin in the component A is selected from one of E44 or E51.
3. The moisture coatable dew condensation preventing and thermal insulating coating of claim 1, wherein: wherein the particle diameter of the hollow microsphere is 20-80 mu m, and the density is 0.35-0.50 g/cm 3 。
4. The moisture coatable dew condensation preventing and thermal insulating coating of claim 1, wherein: wherein the SiO2 aerogel is hydrophobic aerogel powder with the particle size of 15-50 mu m, the pore diameter of 20-50 nm and the heat conductivity coefficient of less than 0.018W/(m.K).
5. A preparation method of the coating is characterized by comprising the following steps: the moisture coatable dew condensation preventing and heat insulating coating comprising any one of claims 1 to 4 prepared by the steps of: sequentially adding the epoxy resin, the diluent, the solvent, the modified hollow microspheres and the modified SiO2 aerogel slurry into a stirrer according to the proportion, adjusting the rotating speed to be 500-600 r/min, and stirring for 30min to obtain a component A; adding an amine curing agent, a diluent, a solvent and a drier into a stirrer in sequence according to a ratio, wherein the drier is DMP-30, a m-phenylenediamine addition product and a polymer with a small molecular polar group, the polymer with the small molecular polar group is polysulfide rubber containing a terminal mercapto group, adjusting the rotating speed to 1000-1200 r/min, and stirring for 10-20 min to obtain a component B; and (3) mixing the component A and the component B according to the mass ratio, and stirring the mixture evenly by hand to obtain the wettable coating anti-condensation heat-insulation paint.
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| CN101899257A (en) * | 2010-09-01 | 2010-12-01 | 北京虹霞正升涂料有限责任公司 | Heavy corrosion resistant, heat insulating and static conductive coating |
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