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Bionic anti-sticking surface and preparation method thereof

An anti-adhesive and rough blank technology, which is applied in the field of bionic anti-adhesive surface and its preparation, can solve the problems that cannot effectively solve the problem of high-viscosity resin adhesion, affect the prepreg molding process, increase the difficulty and cost of cleaning, and achieve excellent results. Anti-resin adhesion ability, uniform structure size and spacing, and effect of reducing surface energy

Inactive Publication Date: 2019-06-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high viscosity of epoxy resin (at 20°C, the viscosity is 1000-50000 times that of water), a large amount of epoxy resin and fibers adhere to the surface of the chopping tool and the mold, which not only causes additional energy loss, but also seriously affects Prepreg molding process and increase the difficulty and cost of post-cleaning
[0004] In order to effectively solve the adhesion problem in industry and life, some anti-adhesion structures or coatings have received extensive attention. For example, Chinese patent application CN201610531105.9 discloses a manufacturing process of an anti-adhesion cutter. The anti-sticking groove is formed on the surface of the cutter, which effectively solves the problem of sticking on the knife surface during the vegetable cutting process, but this punching groove cannot effectively solve the sticking problem of high-viscosity resin
Chinese patent CN201610520973.7 discloses a treatment method to prevent the surface of the roller from sticking. By spraying Teflon coating on the surface of the roller, it can effectively reduce the adhesion of impurities on the surface, prevent the roller from being corroded, improve the use efficiency and save Maintenance costs, but the existing coating has low strength and is easy to fall off, which limits the application of the coating
Aiming at the problem of resin adhesion in the carbon fiber prepreg molding process, there is still a lack of an effective solution

Method used

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  • Bionic anti-sticking surface and preparation method thereof
  • Bionic anti-sticking surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A bionic anti-sticking surface, the specific steps of its preparation process are as follows:

[0037] Step 1. Select tungsten high-speed steel W18Cr4V, cut the steel into 40×40mm square samples, and then polish the samples with 300#, 500#, 800#, 1200#, 2000# sandpaper in order to remove the oxide layer on the surface of the steel and ensure The surface has a certain flatness, and a rough billet is obtained;

[0038] Step 2: Ultrasonic cleaning the rough billet 1 with deionized water, acetone and absolute ethanol in sequence to remove impurities and oil stains on the steel surface, and vacuum drying to obtain rough billet 2;

[0039] Step 3 Use nanosecond laser to process "mastoid" structures with different diameters, the diameters are 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, the spacing is 100 μm, and the laser scanning rate is 200 mm / s to obtain rough blank 3.

[0040] Step 4: Immerse rough billet 3 in an acidic rust remover for 5 minutes, and scrub the processed surf...

Embodiment 2

[0044] The difference from Example 1 is that in Step 3, the diameter of the laser-processed "mastoid" structure is 100 μm, the pitches are 100 μm, 200 μm, 300 μm, 400 μm, and 500 μm, and the scanning rate is 200 mm / s.

[0045] In this example, the contact angle and rolling angle tests of water and resin were carried out on the final sample, and the water and resin droplet volume was 4 μl. The test results show that the "papillary" diameter is 100 μm, the spacing is 100 μm, and the laser scanning rate is 200 mm / s. The contact angle and rolling angle are 147.5° and 9.4°, respectively. Therefore, the "mastoid" prepared in this example has a diameter of 100 μm, a spacing of 100 μm, and a laser scanning rate of 200 mm / s on the surface of the sample, which has a better anti-resin adhesion effect.

Embodiment 3

[0047] The difference from the above example 1 is that in step 3, the diameter of the laser-processed "mastoid" structure is 100 μm, the spacing is 100 μm, and the scanning speed is 800mm / s, 400mm / s, 300mm / s, 200mm / s, 100mm / s.

[0048] In this example, the contact angle and rolling angle tests of water and resin were carried out on the final sample, and the water and resin droplet volume was 4 μl. The test results show that the "papillary" diameter is 100 μm, the spacing is 100 μm, and the laser scanning rate is 100 mm / s. The contact angle and rolling angle are 149.7° and 7.3°, respectively. Therefore, the surface of the biomimetic protrusion structural steel prepared in this example has a better anti-resin adhesion effect. And compared with the optimal sample surface in Examples 1 and 2, the test effect of this sample is better. figure 2 is the SEM image of the surface of the sample with the "mastoid" having a diameter of 100 μm, a pitch of 100 μm, and a laser scanning r...

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Abstract

The invention discloses a bionic anti-sticking surface and a preparation method thereof. The bionic anti-sticking surface imitates a super-hydrophobic micro ''mastoid process'' structure of the lotusleaf surface. The preparation method of the bionic anti-sticking surface comprises the following steps that (1) grinding and polishing are carried out on a high-speed steel sample piece to remove a surface oxidation layer and guarantee the flatness; (2) surface oil contamination is removed by using an organic solvent; (3) etching is carried out on a steel piece by using a nanosecond laser, and themicro ''mastoid process'' structure with regular array is formed; (4) an oxidation layer formed by etching of the steel piece is removed by using an acidic rust remover; and (5) the steel piece is placed into a mixing solution of fluoroalkyl silane and ethyl alcohol for reaction for a period of time, and the anti-sticking surface is obtained after drying. The preparation method of the bionic anti-sticking surface is simple, has high operability and good anti-resin sticking capacity is achieved, and can be applied to a cutter, mould surface and other anti-sticking liquid sticking occasions inthe production process of carbon fiber / epoxy resin prepreg.

Description

technical field [0001] The invention belongs to the field of bionic desorption structures, and in particular relates to a bionic anti-adhesive surface and a preparation method thereof. Background technique [0002] In recent years, carbon fiber prepreg composite materials have been widely used in aerospace, sports equipment, construction industry and electromagnetic shielding due to their high specific strength, high specific stiffness and excellent thermal conductivity, electrical conductivity and corrosion resistance. [0003] During the production of carbon fiber / epoxy prepregs, the prepregs are usually cut to size and placed into molds to make parts with complex shapes. However, due to the high viscosity of epoxy resin (at 20°C, the viscosity is 1000-50000 times that of water), a large amount of epoxy resin and fibers adhere to the surface of the chopping tool and the mold, which not only causes additional energy loss, but also seriously affects The prepreg molding proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/02B23P15/00
CPCB23P15/00C23C22/02
Inventor 陆龙生李凯凯梁林生谢颖熙汤勇
Owner SOUTH CHINA UNIV OF TECH
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