CN112111226B - Hydrophobic anti-drag composite material, preparation method and coating - Google Patents
Hydrophobic anti-drag composite material, preparation method and coating Download PDFInfo
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Abstract
The invention discloses a hydrophobic anti-drag composite material, which comprises the following components in part by weight: double-component hydroxyl acrylic resin and fluorine-containing modified nano SiO2And a mixed wax; the mixed wax includes paraffin wax, palm wax and beeswax. Correspondingly, the invention also discloses a preparation method of the hydrophobic anti-drag composite material and a hydrophobic anti-drag composite coating. The hydrophobic drag reduction composite material of the invention is prepared by modifying nano SiO with bi-component hydroxyl acrylic resin and fluorine-containing silane2And three different waxes as raw materials, and in the preparation method, the fluorine-containing silane is used for modifying the nano SiO2And three different waxes are mixed uniformly and then mixed with the bi-component hydroxyl acrylic resin to obtain a multiple micro-nano composite structure, so that the hydrophobic coating has good hydrophobicity and weather resistance.
Description
Technical Field
The invention relates to the technical field of hydrophobic materials, in particular to a hydrophobic anti-drag composite material, a preparation method and a coating.
Background
The artificial multifunctional super-hydrophobic surface is designed based on the hydrophobic phenomena of lotus leaves, butterfly wings, rose petals, water strider legs and the like in nature. According to the self-cleaning phenomenon of the super-hydrophobic surface of lotus leaves, a water contact angle WCA is larger than 150 degrees, and a sliding angle SA <10 degrees is defined as the surface of the super-hydrophobic material. The research on the internal mechanism of the super-hydrophobic phenomenon in nature discovers that the super-hydrophobic surface has to have two conditions, namely a low-surface-energy material and a surface micro-nano rough structure. Due to the special non-wettability, the super-hydrophobic material has wide application prospects in the fields of self-cleaning, transportation drag reduction, ice coating prevention, oil-water separation and the like.
At present, the hydrophobic coating on the market is divided into a solvent type and a water type. The traditional solvent-based hydrophobic coating takes an organic solvent as a dispersion medium, Volatile Organic Compounds (VOC) possibly generate certain chemical reactions in the curing process to cause secondary pollution, and direct harm is brought to the natural environment and the human health. The other kind of water hydrophobic paint film forming matter is water base polymer and green pollution-free product. The water is used as a diluent, so that the water is not flammable or explosive in the using process, and resources are not easily wasted in the using process, so that the water-based fuel cell is very environment-friendly and safe, and can effectively protect the environment from being polluted. The commonly used water-based hydrophobic coatings are epoxy, polyurethane, acrylic, and the like.
The waterborne acrylic acid is mostly linear and has a linear structure, and the lack of crosslinking points causes the performance of the coating to have defects, such as easy delactation, high minimum film forming temperature, hot viscosity and cold brittleness after film forming and drying, poor anti-delactation property, poor thermal stability and the like. The main chain of the molecule of the water-based polyurethane contains hydrophilic groups, and the groups enable the formed adhesive film to have higher surface free energy and show poorer water resistance. The organic silicon resin is polysiloxane resin with a main chain of silicon-oxygen bonds, has higher Si-O bond energy and easy bond rotation, and endows the organic silicon resin with excellent performances of lower surface tension, good temperature resistance, weather resistance and the like, but has poor adhesive force on common base materials and higher price due to low polarity. Most of the currently produced environment-friendly water-based resin coatings only play a role in simple physical protection and water resistance; the application of the composite material in the performances of mechanical tearing resistance, microbial pollution resistance, super hydrophobicity and the like is lacked, and the requirements of modern products cannot be met.
Disclosure of Invention
The invention aims to provide a hydrophobic anti-drag composite material which has the characteristic of improving the corrosion resistance of a hydrophobic membrane;
the invention aims to provide a preparation method of a hydrophobic anti-drag composite material, which effectively improves the hydrophobicity and the durability of hydroxypropyl resin;
the invention aims to provide a hydrophobic anti-drag composite coating which is good in adhesiveness, corrosion-resistant and excellent in hydrophobic property.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydrophobic drag reduction composite material comprises the following components in percentage by weight: double-component hydroxyl acrylic resin and fluorine-containing modified nano SiO2And a mixed wax; the mixed wax includes paraffin wax, palm wax and beeswax.
Further, the two-component hydroxyl acrylic resin accounts for 22-26% of the total weight of the formula according to the mass ratio, and the fluorine-containing modified nano SiO resin2The sum of the wax and the mixed wax accounts for 65-74% of the total amount of the formula, and the balance is water;
fluorine-containing modified nano SiO2And the mass ratio of the mixed wax to the mixed wax is 3-5: 100.
Further, the mass ratio of the paraffin wax to the palm wax is 6: 4-7: 3, and the beeswax accounts for 4-8% of the mixed wax.
Furthermore, when the composite coating is prepared, the mixed wax is melted into liquid, and the fluorine-containing modified nano SiO is prepared2Adding into liquid to obtain wax mixed emulsion; and then mixing the wax mixed emulsion with the two-component hydroxyl acrylic resin.
The preparation method of the hydrophobic anti-drag composite material comprises the following steps:
(1) and adopting fluorine-containing silane to nano SiO2Modifying to obtain fluorine-containing modified nano SiO2；
(2) Preparing a wax mixed emulsion: melting paraffin, palm wax, beeswax and deionized water, and adding fluorine-containing modified nanometer SiO2Cooling to obtain wax mixed emulsion;
(3) preparing a hydrophobic anti-drag composite material: and (3) diluting the double-component hydroxyl acrylic resin with water, adding the wax mixed emulsion, and uniformly mixing to obtain the hydrophobic anti-drag composite material.
Further, in the step (1), nano SiO is added2Adding into deionized water, adding fluorine-containing silane into ethanol, respectively performing ultrasonic dispersion,then mixing the two, carrying out water bath at 30-50 ℃, carrying out magnetic stirring for 3-5 h, cleaning and drying; wherein, the nano SiO2And the mass ratio of the fluorine-containing silane to the fluorine-containing silane is 1: 3-1: 5.
Further, in the step (2), fluorine-containing modified nano SiO is added into the hot-melted solution2Stirring for 2-3 hours, and rapidly cooling to room temperature to obtain the wax mixed emulsion.
Further, in the step (3), the mass ratio of the bicomponent hydroxyl acrylic resin to water is 3: 1-6: 1.
A hydrophobic drag reduction composite coating comprises the hydrophobic drag reduction composite material and a curing agent;
before the hydrophobic anti-drag composite coating is used, the hydrophobic anti-drag composite material and the curing agent are uniformly mixed.
Furthermore, the mass ratio of the hydrophobic anti-drag composite material to the curing agent is 100: 3-5.
The invention has the beneficial effects that:
the hydrophobic drag reduction composite material of the invention is prepared by modifying nano SiO with bi-component hydroxyl acrylic resin and fluorine-containing silane2And three different waxes as raw materials, and in the preparation method, the fluorine-containing silane is used for modifying the nano SiO2And three different waxes are mixed uniformly and then mixed with the bi-component hydroxyl acrylic resin to obtain a multiple micro-nano composite structure, so that the hydrophobic coating has good hydrophobicity and weather resistance.
Drawings
FIG. 1 is a graph of the water drop angle test results of one embodiment A3 of the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and the detailed description.
The invention provides a hydrophobic anti-drag composite material, which comprises the following components in parts by weight: double-component hydroxyl acrylic resin and fluorine-containing modified nano SiO2And a mixed wax; the mixed wax includes paraffin wax, palm wax and beeswax.
The bi-component hydroxyl acrylic resin is an environment-friendly water-based paint and is a hydroxypropyl secondary dispersion, an isocyanate curing agent component is used in the dispersion system, the reaction of isocyanate groups and hydroxyl groups pushes the paint in the system to form a film, and after water volatilizes to a certain degree, the paint starts to be crosslinked and cured, so that the film is quickly dried and solidified. The two-component hydroxyl acrylic resin coating has the advantages of mild film forming conditions, stable and excellent performance. Secondly, the density is high, and the paint has high hardness, chemical resistance, good adhesive force and high gloss. In addition, the hydroxypropyl resin also has the advantages of excellent color retention, weather resistance, dirt resistance and the like. The two-component hydroxy acrylic resin is a mixture of a hydroxy acrylic resin and a curing agent.
Nano SiO2Has the advantages of chemical inertia, corrosion resistance, high temperature resistance, friction resistance and low cost for constructing a rough structure. Although SiO is present2The nano SiO2 organic polymer composite material has poor compatibility between inorganic materials and organic phases, is easy to cause phase separation and can not be uniformly dispersed in the polymer. But nano SiO2Is in a three-dimensional network structure in a molecular state, has relatively high hydroxyl content on the surface, and can form hydrogen bonds with polymers, namely SiO2The surface modification of (2) provides the possibility. Fluorine atoms have low polarizability and are atoms with the strongest electronegativity and the smallest radius in the periodic table of elements; the C-F bond is the most strongly bonded covalent single bond. Therefore, the fluorine material has the advantages of excellent chemical resistance, heat resistance, oxidation resistance and the like. In addition, the free energy of the organic fluorine surface is low, so that the molecular acting force between the air and the polymer interface is small, the intermolecular cohesion is low, and the organic fluorine is difficult to be soaked by liquid.
In the invention, fluorine-containing silane is used for modifying nano SiO2Obtaining the fluorine-containing modified nano SiO2Not only to SiO2The particles change from hydrophilic to hydrophobic and SiO2Surface grafting fluorine-containing long-chain alkyl to increase SiO2Compatibility of the nanoparticles with the polymer.
The paraffin is common wax, belongs to a common hydrophobic material, mainly comprises short paraffin, and has a lower melting limit within the range of 56-64 ℃. The palm wax is brittle plant wax, the main components of the palm wax are long-chain fatty acid ester and fatty alcohol, and the melting point of the palm wax is 80-86 ℃. Beeswax is also called yellow wax, is a natural animal wax, is wax fat secreted by wax glands at the abdomen of worker bees, mainly comprises esters formed by hexadecanoic acid and triacontanol, and has a melting point of 62-67 ℃. The beeswax has stable chemical property, strong hydrophobicity, acid and alkali resistance and dispersibility, can be dispersed on the surface of a material to form a layer of film, and can isolate air and moisture. The invention adopts three different waxes, the three waxes are gradually crystallized respectively after melting, the conditions that the temperature of the single wax is reduced and the crystallization is irregular and the particle size difference is large are avoided, and multiple micro-nano composite structures can be built with nano particles due to different crystallinities, so that the hydrophobicity and the durability of the hydroxypropyl resin are effectively improved.
Further, the two-component hydroxyl acrylic resin accounts for 22-26% of the total weight of the formula according to the mass ratio, and the fluorine-containing modified nano SiO resin2The sum of the wax and the mixed wax accounts for 65-74% of the total amount of the formula, and the balance is water; fluorine-containing modified nano SiO2The mass ratio of the mixed wax to the mixed wax is 3-5: 100;
in the formula of the hydrophobic drag reduction composite material, the bicomponent hydroxyl acrylic resin plays a role in film formation, when the dosage of the bicomponent hydroxyl acrylic resin is too small, the film formation quality is reduced, the acid and alkali resistance is reduced, and when the dosage of the bicomponent hydroxyl acrylic resin is too large, the fluorine-containing modified nano SiO in the film layer is generated2And when the proportion of the mixed wax is reduced, the hydrophobic property of the film layer is reduced, and when the double-component hydroxyl acrylic resin accounts for 22-26% of the total amount of the formula, the hydrophobic film has the best film forming quality and hydrophobic property.
Fluorine-containing modified nano SiO2Used for improving the hydrophobicity of a film layer, when the fluorine-containing modified nano SiO2When the dosage is too small, the film layer is difficult to achieve better hydrophobic property. When the fluorine-containing modified nano SiO2When the dosage is too large, the film is easy to fall off after film formation, and on the other hand, the fluorine-containing modified nano SiO needs to be prepared in advance2Adding into molten wax, cooling to room temperature, and modifying nano SiO with fluorine2If the dosage is too large, the fluorine-containing modified nano SiO is used2The addition of the molten wax can lead to turbidity of the solution, flocculation and sedimentation, which can cause the reduction of the surface smoothness and finish of the coating and influence the hydrophobicity of the coating.
Further, the mass ratio of the paraffin wax to the palm wax is 6: 4-7: 3, and the beeswax accounts for 4-8% of the mixed wax. In the mixed wax, the dosage of the three waxes is in the order of paraffin wax > carnauba wax > beeswax, and the melting points of the three waxes are respectively 56-64 ℃ of paraffin wax, 80-86 ℃ of carnauba wax and 62-67 ℃ of beeswax. When the solution added with the fluorine-containing modified nano SiO2 is cooled, the medium-content carnauba wax is solidified at first, the generated particles can be uniformly dispersed in the paraffin and the beeswax which are in a molten state, then the beeswax with the minimum content is solidified, at the moment, the beeswax and the carnauba wax are in a uniformly mixed state, then the beeswax and the carnauba wax which are kept in a solidified state are uniformly dispersed in the paraffin, and the wax particles and the SiO2 nano particles are condensed to build a multiple micro-nano composite structure. Because the melting points of the paraffin and the beeswax are close, and the proportion of the three types of wax is set, the cooled mixed wax particles are uniform and small, and the film layer is ensured to have better hydrophobicity and wear resistance.
Furthermore, when the composite coating is prepared, the mixed wax is melted into liquid, and the fluorine-containing modified nano SiO is prepared2Adding into liquid to obtain wax mixed emulsion; and then mixing the wax mixed emulsion with the two-component hydroxyl acrylic resin. By the step of mixing the nanoparticles into the wax, wax particles and SiO are formed2The nano particles build a multiple micro-nano composite structure to effectively improve the hydrophobicity and the durability of the hydroxypropyl resin and prevent SiO in a film layer2The nanoparticles fall off.
The preparation method of the hydrophobic anti-drag composite material comprises the following steps:
(1) and adopting fluorine-containing silane to nano SiO2Modifying to obtain fluorine-containing modified nano SiO2；
(2) Preparing a wax mixed emulsion: melting paraffin, palm wax, beeswax and deionized water, and adding fluorine-containing modified nanometer SiO2Cooling to obtain wax mixed emulsion;
(3) preparing a hydrophobic anti-drag composite material: and (3) diluting the double-component hydroxyl acrylic resin with water, adding the wax mixed emulsion, and uniformly mixing to obtain the hydrophobic anti-drag composite material.
The hydrophobic anti-drag composite material prepared by the method has simple steps and easy operation, and the wax mixed emulsion can effectively improve the hydrophobicity and the durability of the hydroxypropyl resin.
Further, in the step (1), nano SiO2Adding the mixture into deionized water, adding fluorine-containing silane into ethanol, respectively performing ultrasonic dispersion, mixing the two, performing water bath at the temperature of 30-50 ℃, performing magnetic stirring for 3-5 hours, cleaning and drying; wherein, the nano SiO2The mass ratio of the fluorine-containing nano SiO to the fluorine-containing silane is 1: 3-1: 5, and the fluorine-containing nano SiO with the optimal hydrophobic effect is obtained2。
Further, in the step (2), fluorine-containing modified nano SiO is added into the hot-melted solution2Stirring for 2-3 hours, and rapidly cooling to room temperature to obtain the wax mixed emulsion. Stirring for a long time to enable the fluorine-containing modified nano SiO2And the wax is fully mixed uniformly, the large particles can be prevented from being generated by rapid cooling, and a multiple micro-nano composite structure can be formed.
Specifically, paraffin, carnauba wax, beeswax and deionized water are subjected to hot melting in an oil bath at 70-90 ℃, an appropriate amount of OP-10 emulsifier is added, then the mixture is stirred by a high-speed stirrer, and after the mixture is fully and uniformly mixed, fluorine-containing modified hydrophobic SiO2 nanoparticles are added. The wax mixed emulsion is obtained by adding the emulsifier and stirring at high speed to be reddish, and is beneficial to uniformly mixing with the bi-component hydroxyl acrylic resin.
Further, in the step (3), the mass ratio of the bicomponent hydroxyl acrylic resin to water is 3: 1-6: 1. The two-component hydroxy acrylic resin is diluted and then mixed with the wax mixed emulsion, which is beneficial to the uniform dispersion of all raw materials.
A hydrophobic drag reduction composite coating comprises the hydrophobic drag reduction composite material and a curing agent; before the hydrophobic anti-drag composite coating is used, the hydrophobic anti-drag composite material and the curing agent are uniformly mixed.
Furthermore, the mass ratio of the hydrophobic anti-drag composite material to the curing agent is 100: 3-5.
When the hydrophobic anti-drag composite material is used, the hydrophobic anti-drag composite material is mixed with a curing agent, and the hydrophobic anti-drag composite material can be stored independently for a long time, so that the quality guarantee period of the coating is prolonged. Specifically, the curing agent is isocyanate, and the isocyanate group and hydroxyl and carboxyl in the hydrophobic anti-drag composite material are subjected to condensation polymerization and are crosslinked into a high-molecular net structure, so that the coating is firm and the adhesive force is good.
The invention is further illustrated by the following examples.
Example group A
The preparation method of the hydrophobic drag reduction composite material comprises the following steps:
(1) and adopting fluorine-containing silane to nano SiO2Modifying to obtain fluorine-containing modified nano SiO2；
Specifically, nanometer SiO2Adding the mixture into deionized water, adding fluorine-containing silane into ethanol, respectively performing ultrasonic dispersion, mixing the two, performing magnetic stirring in a water bath at 40 ℃ for 4 hours, cleaning and drying; wherein, the nano SiO2And the mass ratio of the fluorine-containing silane is 1: 4.
(2) Preparing a wax mixed emulsion: melting paraffin, palm wax, beeswax and deionized water, and adding the fluorine-containing modified nano SiO2And stirring for 2 hours, and rapidly cooling to room temperature to obtain the wax mixed emulsion.
(3) Preparing a hydrophobic anti-drag composite material: and (3) diluting the bicomponent hydroxyl acrylic resin with water, adding the wax mixed emulsion, and uniformly mixing to obtain the hydrophobic anti-drag composite material.
The formulation of the hydrophobic drag reducing composite of example group a is as follows:
in example set A, the mixing ratio of the hydrophobic drag reducing composite and the curing agent at the time of use is shown in the following table, for example.
| Component (mass ratio) | Example A1 | Example A2 | Example A3 | Example A4 | Example A5 |
| Hydrophobic drag reduction composite material | 100 | 100 | 100 | 100 | 100 |
| Curing agent | 3 | 4 | 5 | 5 | 4 |
The hydrophobic anti-drag composite coating of the embodiment group A comprises the hydrophobic anti-drag composite material and a curing agent; before the hydrophobic anti-drag composite coating is used, the hydrophobic anti-drag composite material and the curing agent are uniformly mixed. The mass ratio of the hydrophobic drag reduction composite material to the curing agent is 100: 4.
The hydrophobic anti-drag composite coating of the example group A is respectively coated on the surfaces of the fabric and the glass slide, and is cured and dried at room temperature to obtain the hydrophobic coating. The hydrophobic coating was tested and the results are shown in the table below. In FIG. 1, FIG. 1a is a graph of the hydrophobic Angle test results for the coating on the fabric of example A3 and FIG. 1b is a graph of the hydrophobic Angle test results for the coating on the glass slide of example A3.
Example group B
The parameters of steps (1) and (2) of the method of preparation were adjusted using the hydrophobic drag reducing composite formulation of example A3 and the hydrophobic drag reducing composite coating formulation, and the parameters of both steps are shown in the following table.
The hydrophobic drag reduction composite coating of example group B was coated on the surface of the fabric and the glass slide, respectively, and cured and dried at room temperature to obtain a hydrophobic coating. The hydrophobic coating was tested and the results are shown in the table below.
Comparative example group A
Referring to the formula of the hydrophobic anti-drag composite material, the formula of the coating and the preparation method of the hydrophobic anti-drag composite material in the embodiment A3, the two-component hydroxyl acrylic resin and the fluorine-containing modified nano SiO in the formula of the hydrophobic anti-drag composite material are changed2The amounts of the mixed waxes added are shown in the following table.
| Component (mass percentage) | Comparative example A1 | Comparative example A2 | Comparative example A3 |
| Double-component hydroxyl acrylic resin | 20 | 30 | 20 |
| Fluorine-containing modified nano SiO2And sum of mixed waxes | 76 | 60 | 70 |
| Water (W) | 4 | 10 | 10 |
And respectively coating the hydrophobic anti-drag composite coating of the comparative example group A on the surfaces of the fabric and the glass slide, and curing and drying at room temperature to obtain the hydrophobic coating. The hydrophobic coating was tested and the results are shown in the table below.
Therefore, when the using amount of the bi-component hydroxyl acrylic resin is too small, the film forming quality is reduced, and the acid and alkali resistance is reduced, and when the using amount of the bi-component hydroxyl acrylic resin is too large, the film layer contains fluorine modified nano SiO2And the proportion of the mixed wax is reduced, and the hydrophobic property of the film layer is reduced.
Comparative example group B
Referring to the formulation, coating formulation and preparation method of hydrophobic drag-reducing composite material of example A3, the fluorine-containing modified nano SiO in the formulation of hydrophobic drag-reducing composite material is changed2The ratio of the wax to the mixed wax and the ratio of each wax in the mixed wax are shown in the following table.
And respectively coating the hydrophobic anti-drag composite coating of the comparative example group B on the surfaces of the fabric and the glass slide, and curing and drying at room temperature to obtain the hydrophobic coating. The hydrophobic coating was tested and the results are shown in the table below.
It can be seen that when the fluorine-containing modified nano SiO2When the dosage is too small, the film layer is difficult to achieve better hydrophobic property. When the fluorine-containing modified nano SiO2When the amount is too large, the film is liable to fall off after film formation, and the abrasion resistance and the salt spray resistance are poor. When the dosage of certain wax in the mixed wax is too large or too small, the hydrophobicity of the film layer is influenced, and the fluorine-containing modified nano SiO is also caused2The particles are easy to fall off.
Comparative example set C
Referring to the formulation of hydrophobic drag reduction composite, coating formulation and preparation method of example A3, the fluorine-containing modified nano SiO was changed2During preparation, the nano SiO2And the mass ratio of the fluorine-containing silane are shown in the following table.
| Mass ratio of raw materials | Comparative example C1 | Comparative example C2 |
| Mass ratio of nano SiO2 to fluorine-containing silane | 1:2 | 1:6 |
The hydrophobic anti-drag composite coating of comparative example group C was coated on the surfaces of the fabric and the slide, respectively, and cured and dried at room temperature to obtain a hydrophobic coating. The hydrophobic coating was tested and the results are shown in the table below.
Thus, in the preparation of fluorine-containing modified nano SiO2When the using amount of the fluorine-containing silane is too much or too little, the fluorine-containing modified nano SiO2The hydrophobicity of (A) is reduced.
Comparative example D
Referring to the hydrophobic drag reducing composite formulation, coating formulation and method of preparation of example A3, steps (2) and (3) are altered to: carrying out hot melting on paraffin, palm wax, beeswax and deionized water, and then carrying out fluorine-containing modified nano SiO2And uniformly mixing the wax liquid after hot melting with the two-component hydroxy acrylic resin diluted by water to obtain the hydrophobic anti-drag composite material. The hydrophobic anti-drag composite coating of comparative example D was coated on the surfaces of the fabric and the glass slide, respectively, and it was found that the water drop angle of the coating was 125.4 °, the abrasion resistance and corrosion resistance were poor, and when the corrosion resistance experiment was performed, the fluorine-containing modified nano SiO was used2The particles are largely detached because the waxes are not bonded to SiO2The nano particles build a multiple micro-nano composite structure.
In the above examples and comparative examples, the water drop angle test, the rubbing resistance, the salt spray resistance, and the acid and alkali resistance test were carried out as follows:
| test items | Test procedure |
| WCA | Testing using a Water droplet Angle measuring apparatus |
| Salt fog | The water drop angle is measured again after the neutral salt spray machine is placed for 24 hours |
| Friction-resistant wiping | Coating a 1kg weight on the dust-free cloth, rubbing the surface of the coating for 20 times, and measuring the water drop angle again |
| Acid and alkali resistance | Dripping diluted hydrochloric acid and sodium hydroxide solution, standing for 24h, washing, and measuring water drop angle again |
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (7)
1. The hydrophobic drag reduction composite material is characterized in that the formula of the composite material comprises two components of hydroxy acrylic resin and fluorine-containing modifierNano SiO2And a mixed wax; according to the mass ratio, the bicomponent hydroxyl acrylic resin accounts for 22-26% of the total amount of the formula, and the fluorine-containing modified nano SiO2The sum of the wax and the mixed wax accounts for 65-74% of the total amount of the formula, and the balance is water; wherein the fluorine-containing modified nano SiO2The mass ratio of the mixed wax to the mixed wax is 3-5: 100;
the mixed wax consists of paraffin, palm wax and beeswax; the mass ratio of the paraffin to the palm wax is 6: 4-7: 3; beeswax accounts for 4-8% of the mixed wax;
when the hydrophobic anti-drag composite material is prepared, the mixed wax is firstly melted into liquid, and the fluorine-containing modified nano SiO is2Adding the wax into the liquid to obtain wax mixed emulsion; then mixing the wax mixed emulsion with the double-component hydroxyl acrylic resin to form wax particles and nano SiO2And (3) building a multiple micro-nano composite structure.
2. The method of making a hydrophobic drag reducing composite of claim 1 comprising the steps of:
(1) and adopting fluorine-containing silane to nano SiO2Modifying to obtain fluorine-containing modified nano SiO2(ii) a Nano SiO2The mass ratio of the fluorine-containing silane to the fluorine-containing silane is 1: 3-1: 5;
(2) preparing a wax mixed emulsion: melting paraffin, palm wax, beeswax and deionized water, and adding the fluorine-containing modified nano SiO2Cooling to obtain wax mixed emulsion;
(3) preparing a hydrophobic anti-drag composite material: and (3) diluting the bicomponent hydroxyl acrylic resin with water, adding the wax mixed emulsion, and uniformly mixing to obtain the hydrophobic anti-drag composite material.
3. The method according to claim 2, wherein in the step (1), nano SiO2Adding the mixture into deionized water, adding fluorine-containing silane into ethanol, respectively performing ultrasonic dispersion, mixing the two, performing water bath at the temperature of 30-50 ℃, performing magnetic stirring for 3-5 hours, cleaning and drying.
4. The method according to claim 2, wherein in the step (2), the fluorine-containing modified nano SiO is added to the hot-melted solution2Stirring for 2-3 hours, and rapidly cooling to room temperature to obtain the wax mixed emulsion.
5. The preparation method according to claim 2, wherein in the step (3), the mass ratio of the two-component hydroxy acrylic resin to water is 3: 1-6: 1.
6. A hydrophobic drag reducing composite coating comprising the hydrophobic drag reducing composite of claim 1 and a curing agent; before the hydrophobic anti-drag composite coating is used, the hydrophobic anti-drag composite material and the curing agent are uniformly mixed.
7. The hydrophobic drag-reducing composite coating of claim 6, wherein the mass ratio of the hydrophobic drag-reducing composite material to the curing agent is 100: 3-5.
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| CN109777260A (en) * | 2019-01-28 | 2019-05-21 | 中国科学院兰州化学物理研究所 | A method of traditional coating is changed into super hydrophobic coating |
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| CN109777260A (en) * | 2019-01-28 | 2019-05-21 | 中国科学院兰州化学物理研究所 | A method of traditional coating is changed into super hydrophobic coating |
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