阅读说明：本技术 一种超疏水易清洁涂料及其制备方法 (Super-hydrophobic easy-cleaning coating and preparation method thereof ) 是由 海书杰 刘亚楠 于 2020-06-22 设计创作，主要内容包括：本发明涉及涂料技术领域,具体涉及一种超疏水易清洁涂料及其制备方法,该涂料包括：十七氟癸基三甲基硅烷、全氟癸基三甲氧基硅烷、纳米二氧化硅、硅溶胶、疏水改性纳米颗粒、钛酸四丁酯、分散剂、乙二醇丁醚及去离子水,另外,本发明还提供了该超疏水易清洁涂料的制备方法。本发明的超疏水易清洁涂料具有较好的超疏水、超疏油特性,可以作为玻璃建筑物表面涂料来使用,可赋予玻璃建筑物表面涂料耐油污、自清洁的功能,并且对各种基材具有良好的粘附性。(The invention relates to the technical field of coatings, in particular to a super-hydrophobic easy-cleaning coating and a preparation method thereof, wherein the coating comprises the following components: heptadecafluorodecyltrimethylsilane, perfluorodecyltrimethylsilane, nano silicon dioxide, silica sol, hydrophobic modified nano particles, tetrabutyl titanate, a dispersing agent, ethylene glycol monobutyl ether and deionized water. The super-hydrophobic easy-cleaning coating has better super-hydrophobic and super-oleophobic characteristics, can be used as a surface coating of a glass building, can endow the surface coating of the glass building with oil stain resistance and self-cleaning functions, and has good adhesion to various substrates.)

1. The super-hydrophobic easy-cleaning paint is characterized by being prepared from the following components in percentage by weight:

3% -6% of heptadecafluorodecyltrimethylsilane;

2-5% of perfluorodecyl trimethoxy silane;

2% -4% of nano silicon dioxide;

1% -3% of silica sol;

4% -6% of hydrophobically modified nanoparticles;

tetrabutyl titanate 0.5% -1.5%;

0.3 to 0.7 percent of dispersant;

15% -25% of ethylene glycol butyl ether;

the balance of deionized water;

the average particle diameter of the nano silicon dioxide particles is 20nm, and the specific surface area is 300m²(iv)/g, the silica sol has an average particle diameter of 40 nm.

2. The superhydrophobic easy-cleaning coating of claim 1, wherein the superhydrophobic easy-cleaning coating is made from the following weight percentages:

4.5% of heptadecafluorodecyltrimethylsilane;

3.5 percent of perfluorodecyl trimethoxy silane;

3% of nano silicon dioxide;

2% of silica sol;

5% of hydrophobically modified nanoparticles;

1% of tetrabutyl titanate;

0.5 percent of dispersant;

20% of ethylene glycol butyl ether;

the balance of deionized water.

3. The super-hydrophobic easy-cleaning coating as claimed in claim 1, wherein the hydrophobic modified nano particles are formed by mixing one or more of hydrophobic nano graphene, hydrophobic nano white carbon black and polytetrafluoroethylene micro powder and performing modification treatment, and the particle size distribution of the hydrophobic modified nano particles is 70-180 nm.

4. The super-hydrophobic easy-cleaning coating according to claim 3, wherein the preparation method of the hydrophobically modified nanoparticles comprises the following steps:

(1) preparing a mixed solution of ethylene glycol and a hydrophobing agent with the volume ratio of 7:1, heating to 60-70 ℃, and stirring for 20-30min at the temperature;

(2) and (2) adding one or more of hydrophobic nano graphene, hydrophobic nano white carbon black and polytetrafluoroethylene micro powder into the step (1), wherein the addition amount is 4-6mg/mL, stirring for 4-6h at 50-60 ℃, filtering and drying to obtain the hydrophobic modified nano particles.

5. The superhydrophobic easy-cleaning coating of claim 4, wherein the hydrophobic agent is a water-soluble environmentally friendly nonionic surfactant.

6. The superhydrophobic easy-cleaning coating of claim 1, wherein the dispersant is dioctyl sodium sulfosuccinate.

7. The method for preparing the superhydrophobic easy-cleaning coating according to any one of claims 1-6, comprising the steps of:

(1) weighing the raw materials according to the weight ratio, mixing the nano silicon dioxide with 1/4 deionized water, stirring for 20-30min at the speed of 500-600r/min, then adding ethylene glycol butyl ether, and continuously stirring for 10-15min at the speed of 1000r/min to obtain mixed slurry A;

(2) adding a dispersing agent into the mixed slurry A obtained in the step (1), and stirring for 5-10min at 4000r/min to obtain mixed slurry B;

(3) adding heptadecafluorodecyltrimethylsilane into the mixed slurry B, and stirring for 6-10h at 50-60 ℃ to obtain modified slurry A;

(4) adding perfluorodecyl trimethoxy silane into silica sol, and reacting at 60-70 ℃ for 3-5h to obtain modified slurry B;

(5) and (3) mixing the modified slurry A in the step (3) with the modified slurry B in the step (4), carrying out bath at 60 ℃ for 4h, adding the hydrophobic modified nanoparticles, tetrabutyl titanate and the rest deionized water, dispersing at 800-.

Technical Field

The invention relates to the technical field of coatings, in particular to a super-hydrophobic easy-cleaning coating and a preparation method thereof.

Background

Super-hydrophobic coatings are a new product, and have been continuously pursued in recent years due to their excellent water repellency, antifouling property and self-cleaning property. The super-hydrophobic product is widely applied to the surface of a glass building. In view of the practical requirements, the development of the super-hydrophobic coating which has super-hydrophobicity, oil resistance and weather resistance, not only has strong water repellency, but also can prevent the surface property change caused by oil pollution, and has good adhesion to different substrates has great significance.

Based on this, chinese patent CN101143989 provides a hydrophobic coating composed of an organosilane gel precursor, silicone oil and nanoparticles, which can generate a super-hydrophobic interface under specific conditions, but the silane gel precursor is used, the preparation process is complex and has a great risk, the constructed hydrophobic interface varies with the molecular weight of the gel precursor, the hydrophobicity is unstable, the adhesion of the silicone coating to plastic, glass and other substrates is poor, the application range is limited, and the practical requirements are difficult to meet.

And a super-hydrophobic acrylic resin coating is provided in Chinese patent CN 102417773. The coating consists of nano particles, acrylic resin, a mixed solvent and heptadecafluorotrimethoxyethoxysilane, wherein the proportion of the components is as follows: nano particles, acrylic resin, mixed solvent and heptadecafluorotrimethoxyethoxysilane, wherein the ratio of heptadecafluorotrimethoxyethoxysilane to heptadecafluorotrimethoxyethoxysilane is 100: 20-60: 20-600: 3-10. After the paint is sprayed on the surface of a solid, the contact angle of water drops on the surface is between 150 DEG and 160 DEG, the rolling angle is less than 10 DEG, a good super-hydrophobic effect can be achieved, but the oil stain resistance of the paint is insufficient, and the surface is easily polluted by various oil stains to lose the super-hydrophobic property after long-time use.

In view of the above, the invention provides a super-hydrophobic easy-cleaning coating and a preparation method thereof through related tests and grope, the coating has better super-hydrophobic and super-oleophobic properties, can be used as a surface coating of a glass building, can endow the surface coating of the glass building with oil stain resistance and self-cleaning functions, and has good adhesion to various substrates.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a super-hydrophobic easy-cleaning coating and a preparation method thereof.

In order to achieve the purpose of the invention, the invention provides the following technical scheme:

the super-hydrophobic easy-cleaning coating is prepared from the following components in percentage by weight:

3% -6% of heptadecafluorodecyltrimethylsilane;

2-5% of perfluorodecyl trimethoxy silane;

2% -4% of nano silicon dioxide;

1% -3% of silica sol;

4% -6% of hydrophobically modified nanoparticles;

tetrabutyl titanate 0.5% -1.5%;

0.3 to 0.7 percent of dispersant;

15% -25% of ethylene glycol butyl ether;

the balance of deionized water;

the average particle diameter of the nano silicon dioxide particles is 20nm, and the specific surface area is 300m²(iv)/g, the silica sol has an average particle diameter of 40 nm.

In the super-hydrophobic easy-cleaning coating, the super-hydrophobic easy-cleaning coating is prepared from the following components in percentage by weight:

4.5% of heptadecafluorodecyltrimethylsilane;

3.5 percent of perfluorodecyl trimethoxy silane;

3% of nano silicon dioxide;

2% of silica sol;

5% of hydrophobically modified nanoparticles;

1% of tetrabutyl titanate;

0.5 percent of dispersant;

20% of ethylene glycol butyl ether;

the balance of deionized water.

In the super-hydrophobic easy-cleaning coating, the hydrophobic modified nano-particles are formed by mixing one or more of hydrophobic nano-graphene, hydrophobic nano-white carbon black and polytetrafluoroethylene micro-powder and performing modification treatment, and the particle size distribution of the hydrophobic modified nano-particles is 70-180 nm.

In the super-hydrophobic easy-cleaning coating, the preparation method of the hydrophobic modified nano-particles comprises the following steps:

(1) preparing a mixed solution of ethylene glycol and a hydrophobing agent with the volume ratio of 7:1, heating to 60-70 ℃, and stirring for 20-30min at the temperature;

(2) and (2) adding one or more of hydrophobic nano graphene, hydrophobic nano white carbon black and polytetrafluoroethylene micro powder into the step (1), wherein the addition amount is 4-6mg/mL, stirring for 4-6h at 50-60 ℃, filtering and drying to obtain the hydrophobic modified nano particles.

In the super-hydrophobic easy-cleaning coating, the hydrophobic agent is a water-soluble environment-friendly nonionic surfactant.

In the super-hydrophobic easy-cleaning coating, the dispersant is dioctyl sodium sulfosuccinate.

In addition, the invention also provides a preparation method of the super-hydrophobic easy-cleaning coating, which comprises the following steps:

(1) weighing the raw materials according to the weight ratio, mixing the nano silicon dioxide with 1/4 deionized water, stirring for 20-30min at the speed of 500-600r/min, then adding ethylene glycol butyl ether, and continuously stirring for 10-15min at the speed of 1000r/min to obtain mixed slurry A;

(2) adding a dispersing agent into the mixed slurry A obtained in the step (1), and stirring for 5-10min at 4000r/min to obtain mixed slurry B;

(3) adding heptadecafluorodecyltrimethylsilane into the mixed slurry B, and stirring for 6-10h at 50-60 ℃ to obtain modified slurry A;

(4) adding perfluorodecyl trimethoxy silane into silica sol, and reacting at 60-70 ℃ for 3-5h to obtain modified slurry B;

(5) and (3) mixing the modified slurry A in the step (3) with the modified slurry B in the step (4), carrying out bath at 60 ℃ for 4h, adding the hydrophobic modified nanoparticles, tetrabutyl titanate and the rest deionized water, dispersing at 800-.

Compared with the prior art, the invention has the following beneficial effects:

according to the super-hydrophobic easy-cleaning coating, the fluorine-containing silane coupling agents with good hydrophobic property, namely heptadecafluorodecyltrimethylsilane and perfluorodecyltrimethoxysilane, are adopted to respectively modify the nano silicon dioxide and the silica sol, and the modified nano silicon dioxide slurry and the silica sol slurry are mixed, so that the prepared coating has good super-hydrophobic and super-oleophobic properties, can be used as a surface coating of a glass building, can endow the surface coating of the glass building with oil stain resistance and self-cleaning functions, and has good adhesion to various substrates;

in addition, the added hydrophobic modified nano-particles can construct a coating with better hydrophobic, oleophobic and self-cleaning functions, and the compatibility of the hydrophobic modified nano-particles and a coating system is improved through modification of a hydrophobic agent, so that the hydrophobic, oleophobic and self-cleaning functions of the coating system are further improved.

Detailed Description

The foregoing aspects of the present invention are described in further detail below by way of examples, but it should not be construed that the scope of the subject matter of the present invention is limited to the following examples, and that all the technologies that can be realized based on the above aspects of the present invention are within the scope of the present invention.