CN112175494A - Manual blade coating type anti-ice-pulling and wear-resistant polyurea coating for water conservancy dam and preparation method thereof - Google Patents
Manual blade coating type anti-ice-pulling and wear-resistant polyurea coating for water conservancy dam and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/02—Polyureas
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
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- 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
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- C09D7/65—Additives macromolecular
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract
The invention provides a manual blade coating type water conservancy dam anti-icing and wear-resistant polyurea coating, which belongs to the technical field of coating production and comprises 10-50 parts of aliphatic isocyanate monomer, 20-80 parts of polyhydric alcohol, 0.2-2.5 parts of catalyst, 10-20 parts of polydimethylsiloxane, 10-50 parts of stearic acid modified nano alumina, 5-25 parts of solvent, 5-20 parts of latent curing agent, 0-2 parts of dispersing agent, 0-2 parts of defoaming agent, 0-2 parts of antioxidant, 0-2 parts of thickening agent and 2-8 parts of pigment. The invention also provides a preparation method of the anti-ice-pulling and wear-resistant polyurea coating for the manual blade coating type water conservancy dam. The polyurea coating provided by the invention comprises polydimethylsiloxane and stearic acid modified nano alumina particles as raw materials, does not need to be matched with finish paint, and can solve the problems of wear resistance, ice pull resistance and aging resistance of the polyurea coating of the water conservancy dam in the prior art through a single polyurea coating; the preparation method of the polyurea coating has the advantages of simple process, easily obtained raw materials and low cost.
Description
Technical Field
The invention relates to the technical field of paint production, in particular to an anti-ice-pulling and wear-resistant polyurea paint for a manual blade coating type water conservancy dam and a preparation method thereof.
Background
When the bottom of the dam and the channel runs under the conditions of high flow rate, large flow and high sand content for a long time, the erosion of the concrete surface is serious, and local exposed ribs appear, so that the stability and the service life of the channel are influenced; the concrete layer is aged and cracked, the seepage is increased, the freeze-thaw damage is caused, and the dam body and the channel surface are damaged.
Ice pull damage is mainly caused by the fact that ice adheres to the surface of an object (freezing force) and moves with the surface of the object during the melting process of the ice, and then upward or downward pulling force is generated on the object, and the effect of the force causes the object to be damaged. In the hydraulic engineering dam body in cold areas, in order to avoid the problem that the self stress of the dam body exceeds an allowable value and cracks appear due to the difference of the internal temperature and the external temperature of the dam body, thermal insulation materials are covered outside the dam body to carry out thermal insulation. In cold regions such as northeast or northwest of China, when the temperature is the coldest, the icing phenomenon occurs on the upstream water surface of the dam, the thickness of an ice layer reaches 1.3m, after the water level of a reservoir is reduced and changed, the ice layer can damage the heat insulation layer of the dam body by ice pulling, and the heat insulation layer of the existing dam body is spliced together, so that gaps exist between the spliced heat insulation layers, the heat insulation layer can be damaged and fall off in an accelerated manner under the action of ice pulling, the dam body can generate temperature cracks finally, potential safety hazards can occur on the dam body, the safe operation of the reservoir is affected, and after the problem occurs, the existing treatment scheme is complex, the construction is difficult, the maintenance cost is high, and the treatment effect is poor.
Polyurea coating (polyurea coatings) adopts a one-time coating process, no chain joint exists in any area, and the polyurea coating is a dust-free material polyurea coating and has the characteristics of strong adhesive force, friction resistance, strong hardness and the like; the polyurea coating has the characteristics of better corrosion resistance, water resistance and wear resistance, and is widely applied in many fields. However, the waterproof and wear-resistant polyurea coating special for the existing reservoir dam is insufficient in waterproof and wear-resistant performance, so that most of dam surfaces and spillways are worn due to the existence of a wear medium, and the use is influenced.
The Chinese patent with the application number of CN201910330039.2 and the invention name of 'a special waterproof wear-resistant polyurea coating for reservoir dams and a processing technology thereof' discloses a special waterproof wear-resistant polyurea coating for reservoir dams and a processing technology thereof, and modified polyaspartic ester is matched with isocyanate to ensure that the coating has better corrosion resistance, wear resistance, stability and the like. The polyaspartic ester polyurea does not contain benzene rings in the molecular structure, is similar to aliphatic polyurea, has excellent aging resistance, has adhesive force between aromatic polyurea and aliphatic polyurea, but does not increase wear-resistant performance groups in the view of the molecular structure, so that the simple polyaspartic ester polyurea can not meet the requirements of wear resistance and ice-pull resistance of a water conservancy dam.
For example, chinese patent with application number CN201910416309.1, entitled "heat preservation, seepage prevention, ice pulling prevention and protection system for dam in severe cold area" and construction method thereof discloses an anti-freezing, melting, heat preservation, ice pulling prevention and protection system for dam body, which is composed of anti-freezing, melting, heat preservation, ice pulling prevention and protection facilities respectively arranged on the upstream surface and the downstream surface of the dam body at both sides of the dam body. The protective facilities comprise an anti-freezing and anti-melting heat insulation layer, a reinforced layer and an anti-icing protective layer from inside to outside. The anti-icing protective layer is formed by a two-layer structure, the inner layer is a bi-component polyurea coating, and the outer layer is fluorine modified weather-resistant polyurea finish paint. The surface of the polyurea coating is coated with the fluorine modified weather-resistant finish paint with high weather resistance and strong hydrophobicity, the organic fluorine compound has low intermolecular cohesion, small molecular acting force between air and a polymer interface, low surface free energy and small surface friction coefficient, the organic fluorine polymer is endowed with excellent water resistance, oil resistance and wear resistance, and the freeze-bonding strength of ice can be reduced, so that the hydrophobic ice-phobic performance of the structure surface is enhanced. Although the freeze-bonding strength of ice can be reduced by the fluorine modified weather-resistant polyurea finish paint, polyurea is coated by the finish paint, and the advantage of polyurea wear resistance cannot be exerted, wherein the thickness of the fluorine modified finish paint is 0.2mm, the wear resistance is poor, and water flow scouring is not resisted; after the finish paint is stripped, the exposed polyurea has poor aging resistance and is easy to lose gloss and chalk.
In conclusion, the existing technical schemes cannot solve the problems of wear resistance and ice pull resistance at the same time, so that a new polyurea coating is urgently needed to be researched, and the problems of wear resistance, ice pull resistance and aging resistance of the polyurea coating for the water conservancy dam can be solved at the same time.
Disclosure of Invention
In view of the above, the invention provides a manual blade coating type water conservancy dam anti-icing and wear-resistant polyurea coating and a preparation method thereof, wherein the raw materials comprise polydimethylsiloxane and stearic acid modified nano alumina particles, and the polyurea coating can solve the problems of wear resistance, ice-pulling resistance and aging resistance of the water conservancy dam polyurea coating in the prior art through a single polyurea coating without matching with finish paint, and the prepared super-hydrophobic coating has wide applicability and high stability; the preparation method of the polyurea coating has the advantages of simple process, easily obtained raw materials and low cost.
In order to achieve the purpose, the invention provides the following technical scheme:
a manual blade coating type water conservancy dam anti-icing and wear-resistant polyurea coating comprises, by weight, 10-50 parts of aliphatic isocyanate monomer, 20-80 parts of polyol, 0.2-2.5 parts of catalyst, 10-20 parts of polydimethylsiloxane, 10-50 parts of stearic acid modified nano alumina, 5-25 parts of solvent, 5-20 parts of latent curing agent, 0-2 parts of dispersing agent, 0-2 parts of defoaming agent, 0-2 parts of antioxidant, 0-2 parts of thickening agent and 2-8 parts of pigment.
Further, the aliphatic isocyanate monomer comprises one or more of isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, 1,4 cyclohexane diisocyanate, cyclohexane dimethylene diisocyanate, trimethyl-1, 6-hexamethylene diisocyanate and methylcyclohexyl diisocyanate.
Further, the polyol is one or more of propylene oxide polyol, polytetrahydrofuran polyether polyol, polycaprolactone polyol and castor oil polyol; the molecular weight of the polyol is 500-4000 and the functionality is 2-4.
Further, the catalyst is one or more of dibutyltin dilaurate, stannous octoate, lead isooctanoate and bismuth isooctanoate.
Further, the molar mass of the polydimethylsiloxane is 1000-4000 g/mol.
Furthermore, in the stearic acid modified nano-alumina, the grafting rate of stearic acid on the surface of the nano-alumina is 6-12%.
Further, the latent curing agent is an oxazolidine latent curing agent;
the oxazolidine latent curing agent is one or more of bisoxazolidine containing a bisurea bond, mono-oxazolidine containing a hydroxyl group and bisoxazolidine containing a bisester bond.
Further, the solvent is one or more of butyl acetate, ethyl acetate, methyl ethyl ketone, acetone, toluene, xylene and aromatic solvent oil.
The invention also provides a preparation method of the manual blade coating type water conservancy dam ice-pulling-resistant and wear-resistant polyurea coating, which is characterized by comprising the following steps:
placing 20-80 parts of polyol by weight into a three-neck flask, dehydrating under vacuum at (100 +/-5) DEG C for (2.5 +/-0.1) hours, and cooling to (50 +/-5) DEG C; then adding 0.2-2.5 parts of catalyst and 5-25 parts of solvent, uniformly stirring and controlling the temperature to be (60 +/-5) DEG C; then adding 10-50 parts of aliphatic isocyanate monomer, stirring uniformly, heating to 85 +/-5 ℃, and reacting for 2 +/-0.1 hours; then adding 0-2 parts of dispersing agent, 0-2 parts of defoaming agent and 2-8 parts of pigment, and stirring at high speed (0.5 +/-0.1) for hours; then adding 10-20 parts of polydimethylsiloxane and 10-50 parts of stearic acid modified nano alumina, stirring at a high speed and dispersing uniformly, and continuing to react at the temperature of (85 +/-5) DEG C for (1 +/-0.1) hours; and then adding 0-2 parts of antioxidant, 0-2 parts of thickener and 5-20 parts of latent curing agent, stirring (0.5 +/-0.1) hours, filtering and discharging to prepare the manual blade coating type water conservancy dam ice-pulling-resistant and wear-resistant polyurea coating.
Furthermore, before use, the stearic acid modified nano alumina and the solvent are subjected to ultrasonic mixing treatment, wherein the mass ratio of the stearic acid modified nano alumina to the solvent is 1 (1-1.5).
The invention provides a manual blade coating type water conservancy dam anti-icing and wear-resistant polyurea coating and a preparation method thereof, wherein the raw materials comprise polydimethylsiloxane and stearic acid modified nano alumina particles, finish paint does not need to be matched, and the problems of wear resistance, ice-pulling resistance and aging resistance of the water conservancy dam polyurea coating in the prior art can be solved through a single polyurea coating, the water contact angle of the prepared polyurea coating is 150 degrees, and good super-hydrophobicity is kept; the icing force is less than 20N, and the ice adhesion on the surface of the coating is small; the wear resistance can reach 750g/500r, and g is less than or equal to 5 mg. Therefore, the anti-ice-pulling and wear-resistant polyurea coating for the manual blade coating type water conservancy dam has the advantages of good wear resistance, ice-pulling resistance and aging resistance, wide applicability and high stability. In addition, the preparation method of the polyurea coating has the advantages of simple process, easily obtained raw materials and low cost.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a manual blade coating type anti-icing-pulling wear-resistant polyurea coating for a water conservancy dam, which comprises, by weight, 10-50 parts of aliphatic isocyanate monomer, 20-80 parts of polyol, 0.2-2.5 parts of catalyst, 10-20 parts of polydimethylsiloxane, 10-50 parts of stearic acid modified nano alumina, 5-25 parts of solvent, 5-20 parts of latent curing agent, 0-2 parts of dispersing agent, 0-2 parts of defoaming agent, 0-2 parts of antioxidant, 0-2 parts of thickening agent and 2-8 parts of pigment.
The polyurea coating is modified by polydimethylsiloxane, and because silicon atoms on the surface of the enrichment material play a role in lubrication, the friction coefficient of the material is reduced. In addition, the bond energy of the silicon-oxygen bond is very large, the thermal stability of the material is improved, and when the material is abraded, more energy is needed to break molecular chains, so that the abrasion resistance is improved.
Hydroxyl on the surface of the nano aluminum oxide and carboxyl of stearic acid are subjected to esterification reaction similar to organic acid and organic alcohol, so that the polarity of the nano aluminum oxide is changed, and the modified nano aluminum oxide can be uniformly dispersed in the coating without agglomeration. Through adding stearic acid modified nanometer alumina particles, the film-forming property of the polyurea surface is damaged, bulges formed by accumulating the nanometer particles appear, the surface becomes rough, and the multi-level micro-nanometer coarse structures can intercept more air, so that the contact area between water drops and the surface is reduced, and the polyurea surface has super-hydrophobic property. The coating after film formation has the characteristics of excellent smoothness, high water contact angle, excellent weather resistance and the like. The water is easy to roll and slide under the action of natural external force, so that the water hanging amount before ice formation (ice coating) is reduced; can inhibit or delay the formation of ice crystals on the surface of the material; the adhesive force between the ice crystals and the contact interface can be reduced; reduce the meteorological disasters to the engineering field caused by the ice coating phenomenon after thawing.
Wherein the aliphatic isocyanate monomer comprises one or more of isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, 1,4 cyclohexane diisocyanate, cyclohexane dimethylene diisocyanate, trimethyl-1, 6-hexamethylene diisocyanate and methyl cyclohexyl diisocyanate. The polyol is one or more of propylene oxide polyol, polytetrahydrofuran polyether polyol, polycaprolactone polyol and castor oil polyol; the molecular weight of the polyol is 500-4000 and the functionality is 2-4. The catalyst is one or more of dibutyltin dilaurate, stannous octoate, lead isooctanoate and bismuth isooctanoate. The latent curing agent is oxazolidine latent curing agent; the oxazolidine latent curing agent is one or more of bisoxazolidine containing a bisurea bond, mono-oxazolidine containing a hydroxyl group and bisoxazolidine containing a bisester bond. The solvent is used for dispersing the stearic acid modified nano alumina; the polyurea coating is used for reducing the viscosity of a polyurea coating system, so that the polyurea coating is easy to carry out manual blade coating construction, and can be selected from one or more of butyl acetate, ethyl acetate, methyl ethyl ketone, acetone, toluene, xylene and aromatic solvent oil.
The stearic acid modified nano aluminum oxide has the advantages that the particle size of the stearic acid modified nano aluminum oxide influences the size of protrusions on the surface of the polyurea coating, so that the hydrophobic performance of the surface of the polyurea coating is influenced, in the stearic acid modified nano aluminum oxide, the grafting rate of stearic acid on the surface of the nano aluminum oxide is 6-12%, the dispersibility of the stearic acid modified nano aluminum oxide in a solvent is improved, the nano aluminum oxide before modification is hydrophilic and oleophobic, but the stearic acid modified nano aluminum oxide is oleophilic and hydrophobic. The molecular weight of the polyol is controlled to be 500-4000, the functionality is controlled to be 2-4, and the molar mass of the polydimethylsiloxane is controlled to be 1000-4000g/mol, because the raw materials are easy to obtain, and the viscosity of the prepared polyurea coating is lower than 2000mPa & S, so that the polyurea coating is easy to scrape and coat by hands.
Example 1
The preparation process of the manual blade coating type anti-ice-pulling wear-resistant polyurea coating for the water conservancy dam comprises the following steps:
placing 20 parts by weight of polyether polyol (molecular weight 2000, functionality of 2) into a three-neck flask, dehydrating under vacuum at (100 +/-5) DEG C for (2.5 +/-0.1) hours, and cooling to (50 +/-5) DEG C; then adding 0.6 part of catalyst dibutyltin dilaurate and 17 parts of solvent butyl acetate, uniformly stirring, and controlling the temperature to be (60 +/-5) DEG C; then adding 10 parts of aliphatic isocyanate monomer isophorone diisocyanate, uniformly stirring, heating to 85 +/-5 ℃, and reacting for 2 +/-0.1 hours; then adding 0.1 part of dispersant BYK110, 0.1 part of defoamer BYK066N and 2 parts of pigment, and stirring at high speed (0.5 +/-0.1) for hours; then adding 15 parts of polydimethylsiloxane and 30 parts of stearic acid modified nano alumina, stirring at a high speed and dispersing uniformly, and continuing to react at the temperature of (85 +/-5) DEG C for (1 +/-0.1) hours; then adding 0.1 part of antioxidant 1010, 0.1 part of thickening agent 407 and 5 parts of latent curing agent TP-830(TDS), stirring (0.5 +/-0.1) hours, filtering and discharging to prepare the manual blade coating type anti-icing and wear-resistant polyurea coating for the water conservancy dam.
Before use, the stearic acid modified nano alumina and a solvent butyl acetate are subjected to ultrasonic mixing treatment, wherein the mass ratio of the stearic acid modified nano alumina to the solvent is 1: 1.1.
The preparation process of the anti-ice-pulling wear-resistant polyurea coating of the manual blade coating type water conservancy dam comprises the following steps:
after the water conservancy dam matrix is pretreated, coating polyurea matching primer, after the primer is completely dried, constructing by adopting a three-cloth five-oil process, namely coating the polyurea coating once, coating a layer of glass cloth, after curing, manually blade-coating the polyurea coating again, coating a layer of glass cloth, and finally manually blade-coating the polyurea coating once, so that the polyurea coating can be coated on the surface of the water conservancy dam.
The manual blade coating type anti-ice-pulling wear-resistant polyurea coating of the water conservancy dam is placed in an environment with the temperature of (25 +/-2) DEG C and the humidity of (50 +/-5)%, and after 7 days of maintenance, the test performance is as follows: abrasion resistance (750g/500r)), g is less than or equal to 5mg, the water contact angle is 145 degrees, the icing force is 10N, and the drawing strength is 3.5 MPa.
Example 2
The preparation process of the manual blade coating type anti-ice-pulling wear-resistant polyurea coating for the water conservancy dam comprises the following steps:
placing 35 parts by weight of polyether polyol (molecular weight 2000, functionality of 2) into a three-neck flask, dehydrating under vacuum at (100 +/-5) DEG C for (2.5 +/-0.1) hours, and cooling to (50 +/-5) DEG C; then adding 0.6 part of catalyst dibutyltin dilaurate and 17 parts of solvent butyl acetate, uniformly stirring, and controlling the temperature to be (60 +/-5) DEG C; then adding 20 parts of aliphatic isocyanate monomer isophorone diisocyanate, uniformly stirring, heating to (85 +/-5) DEG C, and reacting for (2 +/-0.1) hours; then adding 0.1 part of dispersant BYK110, 0.1 part of defoamer BYK066N and 2 parts of pigment, and stirring at high speed (0.5 +/-0.1) for hours; then adding 10 parts of polydimethylsiloxane and 10 parts of stearic acid modified nano alumina, stirring at a high speed and dispersing uniformly, and continuing to react at the temperature of (85 +/-5) DEG C for (1 +/-0.1) hours; then adding 0.1 part of antioxidant 1010, 0.1 part of thickening agent 407 and 5 parts of latent curing agent TP-830(TDS), stirring (0.5 +/-0.1) hours, filtering and discharging to prepare the manual blade coating type anti-icing and wear-resistant polyurea coating for the water conservancy dam.
Before use, the stearic acid modified nano alumina and a solvent butyl acetate are subjected to ultrasonic mixing treatment, wherein the mass ratio of the stearic acid modified nano alumina to the solvent is 1: 1.1.
The preparation process of the anti-ice-pulling wear-resistant polyurea coating of the manual blade coating type water conservancy dam comprises the following steps:
after the water conservancy dam matrix is pretreated, coating polyurea matching primer, after the primer is completely dried, constructing by adopting a three-cloth five-oil process, namely coating the polyurea coating once, coating a layer of glass cloth, after curing, manually blade-coating the polyurea coating again, coating a layer of glass cloth, and finally manually blade-coating the polyurea coating once, so that the polyurea coating can be coated on the surface of the water conservancy dam.
The manual blade coating type anti-ice-pulling wear-resistant polyurea coating of the water conservancy dam is placed in an environment with the temperature of (25 +/-2) DEG C and the humidity of (50 +/-5)%, and after 7 days of maintenance, the test performance is as follows: abrasion resistance (750g/500r)), g is less than or equal to 8mg, the water contact angle is 125 degrees, the icing force is 15N, and the drawing strength is 3.0 MPa.
The invention provides a manual blade coating type water conservancy dam anti-icing and wear-resistant polyurea coating and a preparation method thereof, wherein the raw materials comprise polydimethylsiloxane and stearic acid modified nano alumina particles, finish paint does not need to be matched, and the problems of wear resistance, ice-pulling resistance and aging resistance of the water conservancy dam polyurea coating in the prior art can be solved through a single polyurea coating, the water contact angle of the prepared polyurea coating is 150 degrees, and good super-hydrophobicity is kept; the icing force is less than 20N, and the ice adhesion on the surface of the coating is small; the wear resistance can reach 750g/500r, and g is less than or equal to 5 mg. Therefore, the anti-ice-pulling and wear-resistant polyurea coating for the manual blade coating type water conservancy dam has the advantages of good wear resistance, ice-pulling resistance and aging resistance, wide applicability and high stability. In addition, the preparation method of the polyurea coating has the advantages of simple process, easily obtained raw materials and low cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The manual blade coating type anti-icing and wear-resistant polyurea coating for the water conservancy dam is characterized by comprising, by weight, 10-50 parts of aliphatic isocyanate monomer, 20-80 parts of polyol, 0.2-2.5 parts of catalyst, 10-20 parts of polydimethylsiloxane, 10-50 parts of stearic acid modified nano alumina, 5-25 parts of solvent, 5-20 parts of latent curing agent, 0-2 parts of dispersing agent, 0-2 parts of defoaming agent, 0-2 parts of antioxidant, 0-2 parts of thickening agent and 2-8 parts of pigment.
2. The manual knife-coating type water conservancy dam ice-pulling-resistant and wear-resistant polyurea coating according to claim 1, wherein the aliphatic isocyanate monomer comprises one or more of isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, 1,4 cyclohexane diisocyanate, cyclohexane dimethylene diisocyanate, trimethyl-1, 6-hexamethylene diisocyanate and methylcyclohexyl diisocyanate.
3. The manual blade-coating type water conservancy dam anti-icing and wear-resistant polyurea coating according to claim 1, wherein the polyol is one or more of propylene oxide polyol, polytetrahydrofuran polyether polyol, polycaprolactone polyol and castor oil polyol; the molecular weight of the polyol is 500-4000 and the functionality is 2-4.
4. The hand-knife-coating type polyurea coating material for resisting ice-pulling and abrasion of the water conservancy dam according to claim 1, wherein the catalyst is one or more of dibutyltin dilaurate, stannous octoate, lead isooctanoate and bismuth isooctanoate.
5. The manual blade-coating type polyurea coating material for resisting ice-pulling and abrasion of the water conservancy dam as claimed in claim 1, wherein the molar mass of the polydimethylsiloxane is 1000-4000 g/mol.
6. The manual blade-coating type water conservancy dam ice-pulling-resistant and wear-resistant polyurea coating according to claim 1, wherein in the stearic acid modified nano alumina, the grafting rate of stearic acid on the surface of the nano alumina is 6-12%.
7. The manual blade-coating type water conservancy dam ice-pulling-resistant and wear-resistant polyurea coating according to claim 1, wherein the latent curing agent is an oxazolidine type latent curing agent;
the oxazolidine latent curing agent is one or more of bisoxazolidine containing a bisurea bond, mono-oxazolidine containing a hydroxyl group and bisoxazolidine containing a bisester bond.
8. The manual blade-coating type water conservancy dam ice-pulling-resistant and wear-resistant polyurea coating according to claim 1, wherein the solvent is one or more of butyl acetate, ethyl acetate, methyl ethyl ketone, acetone, toluene, xylene and aromatic solvent oil.
9. The preparation method of the ice-pulling-resistant and wear-resistant polyurea coating of the manual blade coating type water conservancy dam as claimed in claim 1, is characterized by comprising the following steps:
placing 20-80 parts of polyol by weight into a three-neck flask, dehydrating under vacuum at (100 +/-5) DEG C for (2.5 +/-0.1) hours, and cooling to (50 +/-5) DEG C; then adding 0.2-2.5 parts of catalyst and 5-25 parts of solvent, uniformly stirring and controlling the temperature to be (60 +/-5) DEG C; then adding 10-50 parts of aliphatic isocyanate monomer, stirring uniformly, heating to 85 +/-5 ℃, and reacting for 2 +/-0.1 hours; then adding 0-2 parts of dispersing agent, 0-2 parts of defoaming agent and 2-8 parts of pigment, and stirring at high speed (0.5 +/-0.1) for hours; then adding 10-20 parts of polydimethylsiloxane and 10-50 parts of stearic acid modified nano alumina, stirring at a high speed and dispersing uniformly, and continuing to react at the temperature of (85 +/-5) DEG C for (1 +/-0.1) hours; and then adding 0-2 parts of antioxidant, 0-2 parts of thickener and 5-20 parts of latent curing agent, stirring (0.5 +/-0.1) hours, filtering and discharging to prepare the manual blade coating type water conservancy dam ice-pulling-resistant and wear-resistant polyurea coating.
10. The preparation method of the polyurea coating material for resisting ice-pulling and abrasion of the manual blade coating type water conservancy dam according to claim 9, wherein before use, the stearic acid modified nano alumina and the solvent are subjected to ultrasonic mixing treatment, wherein the mass ratio of the stearic acid modified nano alumina to the solvent is 1 (1-1.5).
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