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Hydrophobic surface wetting method and wetting agent

A hydrophobic surface, solvent technology, applied in the direction of coating, etc., can solve the problems of insignificant improvement effect and inability to effectively control the liquid wetting condition, etc.

Active Publication Date: 2021-05-11
派润上海工业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its improvement effect is not obvious, and it cannot effectively control the wetting condition of liquid on the hydrophobic surface, which has great shortcomings.

Method used

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  • Hydrophobic surface wetting method and wetting agent
  • Hydrophobic surface wetting method and wetting agent
  • Hydrophobic surface wetting method and wetting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of modified polyvinylamine:

[0032] Take 1g of polyvinylamine and place it in a beaker filled with 1000mL of deionized water for slow magnetic stirring at a stirring speed of 300rpm. After the polyvinylamine is dissolved, add 1g of PBA and 10g of EDC coupling agent respectively, and then use 0.1M HCl and 0.1 MNaOH solution controls the pH value of the solution in the beaker at 5.5-6.0 all the time, and reacts for 3 hours. Afterwards, the reaction mixture was put into a dialysis bag for 5 days of dialysis separation, and then the resultant was freeze-dried to obtain the modified polyvinylamine, which was named PVAm-PBA.

[0033] dissolve:

[0034] Weigh 0.1g of PVAm-PBA and place it in a 250ml beaker filled with 100ml of deionized water, and dissolve it under slow magnetic stirring at 40-50°C with a stirring speed of 100-300rpm to obtain a mass fraction of 0.1wt% of PVAm-PBA; Weigh 0.1g of PVA and place it in a 250ml beaker filled with 100ml of deionized w...

Embodiment 2

[0047] Modified polyvinylamine:

[0048] Take 0.4g of polyvinylamine and place it in a beaker filled with 400mL of deionized water for slow magnetic stirring at a stirring speed of 300-500rpm. After the polyvinylamine is dissolved, add 0.4g of PBA, 8g of EDC and 4g of NHS coupling agent respectively. Then use 0.1M HCl and 0.1M NaOH solution to control the pH value of the solution in the beaker at 5.5-6.0 all the time, and react for 3 hours. After that, put the reaction mixture into a dialysis bag for 5-7 days of dialysis separation, and then freeze-dry the resultant to obtain the modified polyvinylamine and name it as PVAm-PBA.

[0049] The preparation of PVAm-PBA solution, PVA solution is general embodiment 1, then adjusts the pH of each solution to 6.5,7.5,8.5,9.5 with 0.5M HCl and NaOH solution, promptly obtains the PVAm-PBA, PVA solution of different concentration and pH value .

[0050] The superhydrophobic surface prepared in Example 1 was selected for droplet impact t...

Embodiment 3

[0052] Referring to the preparation steps of Example 1, the raw materials and proportions of droplet 1 in the experimental scheme in Table 5 were selected for preparation, and the collision drop experiment was carried out. The results are shown in Table 6.

[0053] Preparation of surface modified by fluorine-containing superhydrophobic compound: FEMA, St and MMA were subjected to free radical copolymerization reaction in DMF solvent by solution polymerization method, and methacrylate polymer containing perfluoroalkyl group was synthesized. Coating the surface of a glass sheet or a silicon sheet with a thickness of 100-5000nm, drying at 80°C for 4 hours to prepare a fluorine-containing super-hydrophobic surface with a static contact angle of 155°-165°.

[0054] Table 5 Experimental scheme

[0055]

[0056] Table 6 When the droplet pH is the same, the mass concentration is 0.01wt% droplet collision drop test contact angle / °

[0057]

[0058] Control the pH of the new drop...

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Abstract

The invention discloses a hydrophobic surface wetting method and a wetting agent, wherein the hydrophobic surface wetting method comprises: preparing modified polyvinylamine, dissolving, and adjusting pH to obtain a first solution; dissolving polyvinyl alcohol , adjusting the pH to obtain a second solution; combining the first solution with the second solution; a hydrophobic surface wetting agent, which includes modified polyvinylamine and polyvinyl alcohol. The hydrophobic surface wetting method and the wetting agent can effectively improve the wetting effect of the hydrophobic surface, and have good application prospects.

Description

technical field [0001] The invention belongs to the technical field of surface wetting, and in particular relates to a hydrophobic surface wetting method and a wetting agent. Background technique [0002] The wettability is one of the most important properties in the theoretical research and practical application of solid surfaces, and the values ​​of contact angle and rolling are the most common criteria for evaluating surface wettability. Wetting refers to the process in which water or other liquids replace the gas adsorbed on the solid surface, that is, a new liquid-solid interface appears and the previous gas-solid interface disappears. [0003] Superhydrophobic solid surface refers to the surface with a contact angle with water greater than 150°, which has a very wide range of applications in industrial and agricultural production and daily life. However, while the hydrophobic surface brings convenience to people, it also brings many inconveniences. For example, when s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D179/02C09D129/04
CPCC09D179/02C08L29/04
Inventor 张丹苏青春赵启航倪永浩
Owner 派润上海工业科技有限公司