CN105482136A - Method for preparing a superhydrophobic, wear-resistant, electrically conductive and self-cleaning film - Google Patents

Abstract

The invention discloses a method for preparing a superhydrophobic, wear-resistant, conductive and self-cleaning film. The preparation method is specifically as follows: a dimethylsiloxane monomer (silicone? elastomer? base) and a corresponding dimethylsiloxane curing agent (silicone? elastomer? curing? agent) in a mass ratio of 10:1 to 5: Mix and stir at a ratio of 2 to obtain the initial product A; then use methods such as spin coating or scraping coating to coat A on different substrates; then press the graphene sheet into A on the substrate and perform high-temperature curing to obtain Intermediate product B; then a certain mass of A is dispersed in a solvent such as heptane, and B is immersed in it and taken out quickly, and then cured at high temperature, so as to obtain the final product with a self-cleaning film. The obtained film with self-cleaning function has strong wear resistance, superhydrophobicity, conductivity and self-cleaning function.

Description

A method for preparing a superhydrophobic, wear-resistant, conductive and self-cleaning functional film

technical field

The invention relates to a method for preparing a superhydrophobic, wear-resistant, conductive and self-cleaning functional film, which belongs to the field of new materials and functional materials.

Background technique

Since 2004, superhydrophobic materials have been greatly developed. Inspired by nature, such as lotus leaves, researchers have prepared a large number of artificial superhydrophobic materials. But these materials all have common fatal shortcoming: poor mechanical properties, not wear-resistant, easily damaged, and lose superhydrophobic function (J.Zimmermann, F.A.Reifler, G.Fortunato, L.C.Gerhardt, S.Seeger, Adv.Funct. Mater.18, 3662–3669(2008); X.Zhuetal., J.Mater.Chem.21, 15793(2011); Q.Zhuetal., J.Mater.Chem.A1, 5386(2013).); In the case of oil contamination, the self-cleaning function is lost (A.Tuteja et al., Science318, 1618–1622 (2007); X.Deng, L.Mammen, H.J.Butt, D.Vollmer, Science335, 67–70 (2012) ; Y. Lu et al., ACSSustainable Chem. Eng. 1, 102 (2013)). In the present invention, the dimethylsiloxane monomer (silicone elastomer base) and the corresponding dimethyl siloxane curing agent (silicone elastomer curing agent) are mixed in proportion and then combined with the new star material graphene to prepare a wear-resistant super-hydrophobic conductive film, graphite The addition of graphene not only endows the film with conductivity and increases its wear resistance, but also endows it with the self-cleaning function in oil (this is mainly due to the firm grasp of graphene on oil, and then these oils are used as lubricating fluid ).

Invention content:

Technical problem: The purpose of this invention is to provide a method for preparing a superhydrophobic, wear-resistant, conductive and self-cleaning film. The super-hydrophobic membrane prepared by the invention overcomes the fatal shortcoming of the traditional super-hydrophobic membrane that it is not wear-resistant, and has low manufacturing cost, no pollution, no toxicity, and the method is simple and convenient.

Summary of the invention: In order to solve the above technical problems, the present invention provides a method for preparing a superhydrophobic, wear-resistant, conductive and self-cleaning functional film. The method includes: combining dimethylsiloxane monomer with corresponding dimethyl The siloxane curing agent is mixed and stirred evenly in a mass ratio of 10:1 to 5:2 to obtain the initial product, which is defined as A; then, A is coated on different substrates by spin coating or scraping coating; then the Graphene sheets are pressed into A on the substrate, and solidified at high temperature to obtain an intermediate product, which is defined as B; then a certain mass of A is dispersed in a solvent such as heptane to prepare a solution with a concentration of 5mg/ml～2000mg/ml , followed by immersing B in it and taking it out quickly, followed by high-temperature curing to obtain a film with self-cleaning work as the final product, defined as C.

Preferably, the substrate includes any one of glass, metal, paper, wood, and plastic.

Preferably, for the high temperature curing, the temperature is 60°C to 200°C, and the time is 30 seconds to 24 hours.

Beneficial effect: the advantages and positive effects that the present invention has are:

1) The present invention adopts that graphene sheet is partly solidified in product A, and then solidifies ultrathin product A again in the remaining part that graphene sheet leaks out, and such benefit is exactly to overcome the deadly shortcoming that existing material is not wear-resistant, Enhanced practicality;

2) Adding graphene in the present invention can bring into play the excellent mechanical properties of graphene itself, which improves wear resistance;

3) The addition of graphene in the present invention increases the function of the material. Based on the excellent conductivity of graphene, a conductive superhydrophobic film is obtained, so a waterproof and conductive material can be prepared without adding an additional protective layer;

4) The method adopted in the present invention can realize large-scale preparation, is low in cost, non-toxic, green, and has broad application prospects.

detailed description

The present invention will be further described below.

A method for preparing a superhydrophobic, wear-resistant, conductive and self-cleaning functional film provided by the invention, the method comprises: dimethylsiloxane monomer and corresponding dimethylsiloxane curing agent in a mass ratio of 10 : 1-5:2 ratio mixing and stirring to obtain the initial product, which is defined as A; then use methods such as spin coating or scraping coating to coat A on different substrates; then press the graphene sheet into the substrate on the substrate A, and carry out high-temperature curing to obtain an intermediate product, which is defined as B; then disperse a certain mass of A in a solvent such as heptane, and make a solution with a concentration of 5mg/ml-2000mg/ml, and then immerse B in it and take it out quickly , and then cured at a high temperature to obtain a film with a self-cleaning function as the final product, which is defined as C.

The substrate includes any one of glass, metal, paper, wood, and plastic.

For the high temperature curing, the temperature is 60°C to 200°C, and the time is 30 seconds to 24 hours.

Example 1:

The first step is to wash the glass sheet alternately with ethanol and deionized water, and dry it for later use;

In the second step, weigh 4g of dimethylsiloxane monomer (silicone elastomer base) and 0.4g of corresponding dimethyl siloxane curing agent (silicone elastomer curing agent) according to the mass ratio of 10:1, mix and stir evenly to obtain product A, and then Spin coating on the glass slide to be used;

In the third step, the graphene sheet is partially pressed into product A, and cured at 200°C for 30s to obtain product B;

The fourth step is to weigh 2g of product A, add it to a certain volume of heptane to make a solution with a concentration of 40mg/ml, immerse B in it and take it out quickly, and then solidify at 200°C for 60s to obtain the final product C. The specific preparation process is: characterization and testing; contact angle test: the obtained film has superhydrophobic properties for milk, coffee, and acid-base solutions, and the contact angle exceeds 150°; self-cleaning test: sprinkle soil on the inclined film It can be found that just like the self-cleaning of lotus leaves, as the water droplets roll down in a spherical shape, the soil on the film is also taken away, thus realizing the self-cleaning function; self-cleaning test after oil pollution: existing After encountering oil pollution, the material loses its self-cleaning function, while the membrane in the present invention mimics the function of Nepenthes and realizes self-cleaning after oil pollution. Specifically: soak the film in heptane or cooking oil and take it out, then sprinkle the soil on the polluted film, and drip water droplets on it. It can be seen that the soil is taken away by the water droplets that slide down, realizing self-cleaning; Abrasion test: put the film close to the sandpaper, then add a 100g weight on it, then push the film to slide 10cm on the sandpaper, then rotate the film 90°, add a 100g weight, and slide 10cm, then weigh For one cycle, we tested the film 50 times, and tested the contact angle after 0 times, 10 times, 20 times, 30 times, 40 times, 50 times, and found that after 50 times of wear tests, the contact angle was not It is still superhydrophobic; anti-icing test: Cool the bare glass and the glass with superhydrophobic to -35°C, and then drop water on it, the water freezes immediately on the bare glass on the left; and on the right On the glass, the water drop rolls down immediately, there is no time for freezing, and it plays the role of anti-icing; conductivity test: the film is made into a U shape by a graphic method, and then its resistance is 330kΩ measured by a multimeter. The amount can further reduce the resistance.

Example 2

Basically the same as Example 1, the difference is: the dimethylsiloxane monomer (silicone elastomer base) and the corresponding dimethyl siloxane curing agent (silicone elastomer curing agent) are mixed and stirred uniformly at a mass ratio of 10:3. At the same time, the substrate is made of metal copper, the curing temperature is 100°C, and the curing time is 2h. All characterization test results are similar to the results in Example 1;

Example 3

It is basically the same as in Example 1, except that the dimethylsiloxane monomer (silicone elastomer base) and the corresponding dimethyl siloxane curing agent (silicone elastomer curing agent) are mixed and stirred uniformly at a mass ratio of 10:4. The substrate is filter paper, the curing temperature is 80° C., and the curing time is 12 hours. All the characterization test results are similar to those in Example 1;

Example 4

Basically the same as Example 2, except that the substrate is plastic such as pet, the curing temperature is 60°C, and the curing time is 24 hours. All the characterization test results are similar to those in Example 1;

Example 5

Basically the same as implementation 1, the difference is: the concentration of the configured heptane solution is 5mg/ml;

Example 6

Basically the same as implementation 1, the difference is: the concentration of the configured heptane solution is 2000mg/ml;

Example 7

Basically the same as implementation 1, the difference is: the concentration of the heptane solution configured is 1000mg/ml. The above is only a preferred embodiment of the present invention. Under the premise of the principle of the invention, some improvements can also be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims (3)

1. prepare super-hydrophobic, wear-resisting, conduction and there is the method for self-cleaning function film, it is characterized in that: the method comprises: by dimethylsiloxane monomer and corresponding dimethyl siloxane solidifying agent in mass ratio the ratio mixing and stirring of 10:1 ~ 5:2 obtain initial product and be defined as A; Then adopt the method such as spin coating or blade coating, A is coated with on different substrates; Then graphene film is pressed in the A on substrate, and carries out hot setting and obtain intermediate product and be defined as B; Then the A of certain mass is dispersed in heptane equal solvent, is made into the solution of concentration 5mg/ml ~ 2000mg/ml, then B be immersed and take out fast, then carrying out hot setting, thus obtain final product and have and be defined as C from the film of clear clean merit.

2. according to claim 1ly a kind ofly prepare super-hydrophobic, wear-resisting, conduction and have the method for self-cleaning function film, it is characterized in that, described substrate comprises glass, metal, paper, plank, any one in plastics.

3. according to claim 1ly a kind ofly prepare super-hydrophobic, wear-resisting, conduction and have the method for self-cleaning function film, it is characterized in that, described hot setting, temperature is 60 degrees Celsius to 200 degrees Celsius, and the time is 30 seconds to 24 hours.