CN111348655A

CN111348655A - Preparation method of super-amphiphobic nano functional material

Info

Publication number: CN111348655A
Application number: CN201811581080.9A
Authority: CN
Inventors: 单加维; 孙文明
Original assignee: Beijing Zhongke East Asia Nano Material Technology Co ltd
Current assignee: Beijing Zhongke East Asia Nano Material Technology Co ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2020-06-30

Abstract

The invention discloses a preparation method of a super-amphiphobic nano functional material. The method comprises the following steps: mixing Tetraethoxysilane (TEOS), ethanol and water, stirring, adding ammonia water to prepare a hydrophilic silicon dioxide solution, filtering, washing and drying to obtain the hydrophilic silicon dioxide nano powder. Adding the powder into a 5% NaOH solution, stirring, dispersing, adding a dimethyldichlorosilane monomer solvent for hydrophobization, filtering, washing and drying to obtain the hydrophobic silicon dioxide nano powder. Adding gamma-aminopropyltriethoxysilane into toluene, stirring quickly, adding hydrophobic silica powder and hydroxymethyl cellulose, and stirring vigorously. And adding fluoride into the liquid, continuously stirring for 2 days, and obtaining lower-layer liquid by adopting a liquid separation method to obtain the hydrophobic and oleophobic liquid. Finally, Dow Corning 6040 is added to increase the adhesive force and film forming property of the hydrophobic and oleophobic liquid on the base materials such as glass and metal.

Description

Preparation method of super-amphiphobic nano functional material

Technical Field

The invention belongs to the field of preparation of hydrophobic and oleophobic materials, and particularly relates to a preparation method of a nano super-hydrophobic and super-oleophobic material.

Background

Road traffic, wind power generation and photovoltaic power generation in China are rapidly developed, but various problems are faced in the aspects of facility maintenance and cleanness, such as great cleaning difficulty, potential safety hazard of high-altitude cleaning, environmental pollution caused by a cleaning agent and the like, long-term cleanness is difficult to maintain, and a great amount of cost is spent on cleaning and maintaining every year. Therefore, not only can a great deal of waste of water resources be caused, but also a great deal of manpower and financial resources can be wasted.

The advent of super-amphiphobic materials could solve the above problems. The super-amphiphobic nano material is a novel material with hydrophobic and oleophobic capabilities based on the construction of a micro/nano structure, and can directly play a self-cleaning role by applying the super-amphiphobic material to the outer surface of a highway guardrail and the outer surface of a wind power blade. Meanwhile, oil stains of polluted expressway facilities caused by automobile exhaust can be removed, so that the cleaning effect can be achieved, the waste of water resources, manpower and financial resources can be reduced, and the environment-friendly effect is achieved.

At present, the super-amphiphobic material has some defects, such as complex preparation process and unsuitability for industrialization; the mechanical property of the coating is poor and is easy to damage; the hydrophobic and oleophobic properties are low; higher cost, etc. Therefore, the super-amphiphobic nano material with the micro/nano structure is constructed based on the organic fluoride modified nano silicon dioxide, and the self-cleaning effect on the outer surface of the highway guardrail and the outer surface of the wind power blade is obvious and durable.

Disclosure of Invention

The invention provides a preparation method of an environment-friendly, high-adhesion and low-cost nano super-hydrophobic and super-oleophobic material, which can be used for any substrate surface (such as glass, metal, ceramic and the like). The purpose of the invention is realized by the following technical scheme:

(1) preparing nano silicon dioxide: mixing Tetraethoxysilane (TEOS), ethanol and water, stirring for 10-20 minutes, adding ammonia water to prepare hydrophilic silicon dioxide solution, filtering, washing and drying to obtain the hydrophilic silicon dioxide nano powder. The adding proportion of Tetraethoxysilane (TEOS), ethanol, ammonia water and water is as follows: 1: (10-50): (5-20): (1-5).

(2) Hydrophobic modification of nano silicon dioxide powder: adding the prepared hydrophilic silicon dioxide nano powder into a strong base solution, stirring and dispersing for 5-8h at a certain temperature, adding a dimethyl dichlorosilane monomer solvent for hydrophobization, filtering, washing and drying to obtain the hydrophobic silicon dioxide nano powder. The strong base is one of NaOH and KaOH, the concentration is 2% -15%, and the proportion of the hydrophilic silicon dioxide nano powder, the strong base solution and the dimethyl dichlorosilane monomer is as follows: 1: (35-65): (8-16).

(3) Adding gamma-aminopropyltriethoxysilane into toluene, quickly stirring for 2 hours, then adding hydrophobic silica powder and hydroxymethyl cellulose, and violently stirring for 30 minutes. The proportion of the added gamma-aminopropyl triethoxysilane, the toluene, the hydrophobic silicon dioxide powder and the hydroxymethyl cellulose is as follows: 1: (25-40): (2-5): (0.5-1) to obtain a liquid A.

(4) And adding metal fluoride into the liquid A, heating the liquid to 80 ℃, continuously and violently stirring for 2-4 days, and obtaining lower-layer liquid by adopting a liquid separation method, namely fluorinated organic matter and hydrophobic and oleophobic liquid of hydrophobic silica. The metal fluoride is one of cobalt fluoride or silver fluoride. The adding proportion of the metal fluoride and the liquid A is as follows: 1: (8-20).

(5) Finally, Dow Corning 6040 is added into the fluorinated organic substance and the hydrophobic and oleophobic liquid of the hydrophobic silicon dioxide, the adding amount is 0.01% -1%, and the adhesive force and the film forming property of the hydrophobic and oleophobic liquid on base materials such as glass and metal are improved.

Example 1:

mixing 10g of Tetraethoxysilane (TEOS), 400g of ethanol and 150g of water, stirring for 10 minutes, then adding 30g of ammonia water to prepare a hydrophilic silicon dioxide solution, filtering, washing and drying to obtain the hydrophilic silicon dioxide nano powder. Adding the powder into 60g of 5 percent NaOH solution, stirring and dispersing for 5 hours at 50 ℃, adding 15g of dimethyldichlorosilane monomer solvent for hydrophobization, filtering, washing and drying to obtain the hydrophobic silicon dioxide nano powder. 1g of gamma-aminopropyltriethoxysilane was added to 40g of toluene and rapidly stirred for 2 hours, and then 3g of hydrophobic silica powder and 1g of hydroxymethyl cellulose were added and vigorously stirred for 30 minutes. 6g of cobalt fluoride is added into the liquid, the temperature of the liquid is heated to 80 ℃, and the liquid is continuously stirred for 2 days to prepare the hydrophobic and oleophobic liquid. Finally, 0.3g of Dow Corning 6040 is added to increase the adhesion and film forming property of the hydrophobic and oleophobic liquid on substrates such as glass and metal.

The prepared nano super-hydrophobic and oleophobic material is sprayed on a clean automobile plate, the automobile plate is placed in a drying box at 60 ℃, drying is carried out for 3 hours, a contact angle of a sample is tested by using a contact angle instrument (OCA 20 machine Data-Physics), the contact angle of water is about 162 degrees, and the contact angle of soybean oil is 156 degrees.

Claims

1. Preparing nano silicon dioxide: mixing Tetraethoxysilane (TEOS), ethanol and water, stirring for 10-20 minutes, adding ammonia water to prepare hydrophilic silicon dioxide solution, filtering, washing and drying to obtain the hydrophilic silicon dioxide nano powder.

2. The adding proportion of Tetraethoxysilane (TEOS), ethanol, ammonia water and water is as follows: 1: (10-50): (5-20): (1-5).

3. Hydrophobic modification of nano silicon dioxide powder: adding the prepared hydrophilic silicon dioxide nano powder into a strong base solution, stirring and dispersing for 5-8h at a certain temperature, adding a dimethyl dichlorosilane monomer solvent for hydrophobization, filtering, washing and drying to obtain the hydrophobic silicon dioxide nano powder.

4. The strong base is one of NaOH and KaOH, the concentration is 2% -15%, and the proportion of the hydrophilic silicon dioxide nano powder, the strong base solution and the dimethyl dichlorosilane monomer is as follows: 1: (35-65): (8-16).

5. Adding gamma-aminopropyltriethoxysilane into toluene, quickly stirring for 2 hours, then adding hydrophobic silica powder and hydroxymethyl cellulose, and violently stirring for 30 minutes.

6. The proportion of the added gamma-aminopropyl triethoxysilane, the toluene, the hydrophobic silicon dioxide powder and the hydroxymethyl cellulose is as follows: 1: (25-40): (2-5): (0.5-1) to obtain a liquid A.

7. And adding metal fluoride into the liquid A, heating the liquid to 80 ℃, continuously and violently stirring for 2-4 days, and obtaining lower-layer liquid by adopting a liquid separation method, namely fluorinated organic matter and hydrophobic and oleophobic liquid of hydrophobic silica.

8. The metal fluoride is one of cobalt fluoride or silver fluoride.

9. The adding proportion of the metal fluoride and the liquid A is as follows: 1: (8-20).

10. Finally, Dow Corning 6040 is added into the fluorinated organic substance and the hydrophobic and oleophobic liquid of the hydrophobic silicon dioxide, the adding amount is 0.01% -1%, and the adhesive force and the film forming property of the hydrophobic and oleophobic liquid on base materials such as glass and metal are improved.