CN107364057A - A kind of preparation method of different roughness template - Google Patents

Abstract

The invention provides a kind of preparation method of different roughness template, comprise the following steps：Step 1：Mixed preparing epoxy resin, as base material, with glass plate, metallic plate etc. for base plane, is uniformly scratching base material, is standing 1 5min above with curing agent；Step 2：Silicon-carbide particle is uniformly paved with substrate surface, is placed in 80 110 DEG C of 2 4h of solidification in baking oven；Step 3：Room temperature is cooled to after taking-up, the silicon-carbide particle of the non-set of epoxy resin surface is blown after connecting air pump with air gun off, obtains shaggy template.A kind of preparation method of coarse template of the present invention is theoretical based on " lotus leaf effect ", can be used in preparing the polymer material film with even roughness degree, makes it have hydrophobicity.

Description

A preparation method of templates with different roughness

technical field

The invention relates to a method for preparing templates with different roughnesses, which is used for constructing micro-nano rough structures on the surface of bionic lotus leaves on the surface of polymer materials.

Background technique

Membrane materials are widely used in many fields due to their advantages of good lighting, various shapes, and good toughness. However, long-term sunlight exposure and external environmental pollution will cause dust to accumulate on the surface of the membrane. Cleaning is dangerous and costly. If the membrane material can have super-hydrophobic self-cleaning properties, the cost of using the membrane material can be reduced.

The surface of the lotus leaf has strong hydrophobic properties. The droplets falling on the surface of the lotus leaf can gather on the leaf surface and roll back and forth. The dust on the leaf surface is carried away by the rolling of the droplets to achieve self-cleaning. This is the "lotus leaf effect" of "out of silt without staining", which provides a theoretical basis for us to prepare super-hydrophobic self-cleaning membranes.

There are many micron-scale "papillae" distributed on the leaf surface of the lotus leaf. The air between adjacent papillae makes an extremely thin and nano-thick air layer exist on the leaf surface of the lotus leaf. The size of the water droplet is much larger than that of the papilla. The distance between the mastoids and the air layer forms the lifting effect of the water droplets. When the water drop falls on the surface of the lotus leaf, it can only contact the mastoid convex top and the wax crystal of the ultramicrostructure, and the contact area with the surface of the lotus leaf is greatly reduced, and the water drop cannot penetrate. The surface tension of the water drop makes its shape close to spherical, so it rolls freely on the hydrophobic surface of the lotus leaf, which is the superhydrophobic principle of the lotus leaf surface.

After exploration, people have gradually mastered a variety of methods to construct superhydrophobic surfaces, mainly including chemical etching, sol-gel method, surface graft modification, electrospinning, steam-induced phase separation, and plasma etching. etc. By modifying the surface of the material, the surface of the material can be made superhydrophobic. However, most methods have the disadvantages of high preparation cost, complex process and difficulty in large-scale promotion.

Contents of the invention

The purpose of the present invention is to provide a method for preparing templates with different roughnesses, so as to construct a micro-nano rough structure on the surface of a bionic lotus leaf on the surface of a polymer material, so as to achieve super-hydrophobic self-cleaning performance.

In order to achieve the above object, the technical solution of the present invention is: a method for preparing templates with different roughnesses, comprising the following steps:

(1) Mix and prepare epoxy resin and curing agent as the base material, use a glass plate, metal plate, etc. as the base plane, scrape the base material evenly on it, and let it stand for 1-5 minutes;

(2) Evenly cover the surface of the substrate with silicon carbide particles, and place it in an oven at 80-110°C for 2-4 hours to cure;

(3) Cool to room temperature after taking it out, connect the air pump with an air gun and blow off the unfixed silicon carbide particles on the surface of the epoxy resin to obtain a template with a rough surface.

After the preparation of the template is completed, the coating glue of the polymer film material is prepared, evenly scraped and coated on the surface of the template, put into the oven to dry and then taken out, and the film is peeled off after cooling to room temperature.

In the process of preparing templates, silicon carbide with different meshes can be used to prepare templates with different roughness, so as to construct polymer membrane structures with different degrees of hydrophobic properties.

The distilled water contact angle test was carried out on the obtained polymer film, and the polymer film prepared by the template with different roughness had different levels of hydrophobic properties.

Beneficial effects produced by the present invention: the present invention provides a new method for preparing a rough template, which is easy to operate, low in cost, strong in practicability and easy for mass production. The polymer material film prepared by this template can achieve super-hydrophobicity.

detailed description

The present invention will be further described below in conjunction with embodiment. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

Example 1

(1) Mix and prepare epoxy resin and curing agent as the base material, take the glass plate as the base plane, scrape the base material evenly on it, and let it stand for 1 min;

(2) Take a clean and dry glass rod, and wrap a scotch tape about 1 mm thick at both ends;

(3) Sprinkle silicon carbide particles with a mesh number of 400, 600, 1000, and 1500 on one end of the epoxy resin, and gently push down with a smooth cylinder at a constant speed so that the silicon carbide particles evenly cover the surface of the epoxy resin ;

(4) Place the glass plate in an oven at 80°C to solidify for 3 hours, take it out, and cool it to room temperature;

(5) After connecting the air pump with an air gun, blow off the unfixed silicon carbide particles on the surface of the epoxy resin to obtain a template with a rough surface;

(6) Prepare PVDF coating glue, evenly scrape and coat the coating glue on the surface of the template, put it in an oven for drying at 80°C, take it out after drying, and peel off the film after cooling to room temperature;

(7) PVDF membrane samples were used to test the distilled water contact angles of the membranes prepared from templates obtained from silicon carbide with different meshes.

(8) Through the obtained contact angle data, we can understand the effect of templates with different roughness on the hydrophobicity of PVDF.

Example 2

(1) Mix and prepare epoxy resin and curing agent as the base material, take the glass plate as the base plane, scrape the base material evenly on it, and let it stand for 1 min;

(2) Take a clean and dry glass rod and wrap a transparent tape about 2 mm thick at both ends;

(3) Sprinkle silicon carbide particles with a mesh number of 400, 600, 1000, and 1500 on one end of the epoxy resin, and gently push down with a cylinder with a smooth surface at a constant speed, so that the silicon carbide particles evenly cover the surface of the epoxy resin ;

(4) Place the glass plate in an oven at 80°C to solidify for 3 hours, take it out, and cool it to room temperature;

(5) After connecting the air pump with an air gun, blow off the unfixed silicon carbide particles on the surface of the epoxy resin to obtain a template with a rough surface;

(6) Prepare PVDF coating glue, evenly scrape and coat the coating glue on the surface of the template, put it in an oven for drying at 80°C, take it out after drying, and peel off the film after cooling to room temperature;

(7) Prepare samples with PVDF membrane, and test its distilled water contact angle.

(8) Different template thicknesses have different fixation abilities to silicon carbide, so different thicknesses of templates also affect the roughness of templates. Through comparative analysis with Example 1, we can understand the influence of different template thicknesses on the hydrophobicity of PVDF membranes.

Example 3

(1) This embodiment is basically the same as the above-mentioned embodiment 1, the difference is that after the silicon carbide particles are covered on the surface of the epoxy resin, a glass plate or other objects are used to apply downward pressure on the surface of the silicon carbide particles to make the silicon carbide particles Go deeper into the stencil to change the surface roughness of the stencil.

(2) Different pressures lead to different embedding depths of the template on silicon carbide, so the different pressures applied also affect the surface roughness of the template. Through comparative analysis with Example 1, it is understood that different pressures affect the hydrophobicity of PVDF membranes.

Claims (8)

1. a kind of preparation method of different roughness template, it is characterised in that different degrees of in the substrate surface construction of smooth even Coarse structure.

2. surface roughness as claimed in claim 1, it is characterised in that scratch one layer of solid in smooth substrate surface Grain, prepares the template with coarse structure.

3. there is the template of coarse structure as claimed in claim 2, it is characterised in that the ability to cure and solid particle of base material Property, size and distribution situation.

4. the ability to cure of base material as claimed in claim 3, it is characterised in that the template prepared with the base material should have one Fixed hardness, and the particle of set substrate surface can be firmly obtained, the coarse structure of construction can be made there is stability, and base material It should not reacted with macromolecule member material.

5. the property of solid particle as claimed in claim 3, it is characterised in that the particle should have stable property, and not It can be reacted with base material and high polymer material.

6. the distribution situation of solid particle as claimed in claim 3, it is characterised in that the thickness of solid particle layer, to solid The pressure that grain applies.

7. the preparation method of the different roughness template described in a kind of claim 1 or 2, it is characterised in that this method includes following Several steps：

(1) base material prepared is uniformly scratched in a certain even curface；

(2) in substrate surface uniform fold solid particle, coarse structure is formed；

(3) template is subjected to heating cure processing, makes it have stable coarse structure.

A kind of 8. preparation method of different roughness template according to claim 7, it is characterised in that：The base material is ring The homogeneous mixture of oxygen tree fat and curing agent；Even curface selects glass plate；Solid particle is the carborundum of different meshes Grain；Heating cure processing is to handle 30min under conditions of 80 DEG C of baking oven.