Hydrophilic oleophobic easy-to-clean coating and preparation method thereof
By preparing a core-shell structure coating containing isopropoxy tris(ethylenediamino-N-ethoxy) titanate and perfluoroalkyl betaine, the problems of white film and water stains during the surface cleaning of kitchen appliances were solved, and the hydrophilic and oleophobic properties and durability were improved.
Patent Information
- Application Number
- CN202510690183.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-27
- Publication Date
- 2025-09-26
AI Technical Summary
The surface coatings of existing kitchen appliances easily leave white films or water stains during the cleaning process, and the hydrophilic coatings have insufficient resistance to blistering, making it difficult to achieve good cleaning effects and durability at the same time.
Using components such as isopropoxy tris(ethylenediamino-N-ethoxy) titanate, tetraethyl orthosilicate and perfluoroalkyl betaine, a hydrophilic and oleophobic coating is prepared through specific proportions and processes to form a hybrid network with a core-shell structure, thereby enhancing the mechanical strength and functional durability of the coating.
The coating has hydrophilic and oleophobic properties, reduces oil adhesion, avoids white film and water stains, and maintains good hydrophilicity at high temperatures, improving the coating's wear resistance and blister resistance.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to a coating, in particular to a coating applied to the surface of kitchen appliances. The present invention also relates to a preparation method of the coating. Background Art
[0002] Regarding the problem of difficult-to-wipe oil stains on the surface of kitchen hoods and stoves, the industry has developed many solutions. Through structural changes, more flat tempered glass is used to reduce the dead corner problem of sheet metal. However, flat tempered glass is still difficult to clean when faced with old oil and various sauces, and an easy-to-clean coating needs to be applied to the glass surface.
[0003] Currently, the easy-to-clean coatings on the market are mainly amphiphobic coatings, which use extremely low surface energy to make water and oil form balls on their surface, reducing adhesion. However, this coating has two major problems. One is that when wiped with a wet cloth, a white film will be left on the surface, causing users to mistakenly think that it has not been wiped clean. After repeated wiping, ring-shaped water stains are easily left on the surface after drying.
[0004] Subsequently, super hydrophilic materials were developed on the market. When wiped with a wet cloth, a water film will form on the surface without leaving a white film. However, because the hydrophilicity is too strong, the surface of the material will be affected by water, and the coating will become inresistant to blistering and fail.
[0005] To effectively address these two issues, a hydrophilic-oleophobic coating must be developed that retains the cleaning advantages of super-hydrophilic coatings while reducing the problem of oil fume adhesion. Currently, most hydrophilic-oleophobic materials are still in the research laboratory stage, and the wear resistance of the film after formation is very poor, making them unsuitable for practical application. Summary of the Invention
[0006] The first technical problem to be solved by the present invention is to provide a hydrophilic, oleophobic, and easy-to-clean coating in response to the above-mentioned technical status quo.
[0007] The second technical problem to be solved by the present invention is to provide a method for preparing a hydrophilic and oleophobic easy-to-clean coating in response to the above-mentioned technical status quo.
[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a hydrophilic and oleophobic easy-to-clean coating, characterized by comprising the following components and their weight ratios
[0009]
[0010]
[0011] Preferably, the alcohol organic solvent is at least one of isopropyl alcohol, propylene glycol, ethanol, methanol and propanol.
[0012] The technical solution adopted by the present invention to solve the second technical problem is: a method for preparing a hydrophilic and oleophobic easy-to-clean coating, comprising the following steps:
[0013] ① Take isopropoxy tris(ethylenediamino-N-ethoxy) titanate, tetraethyl orthosilicate (TEOS) and hydrophilic oleophobic powder, add them to an alcohol organic solvent, stir and dissolve them to obtain a mixed solution;
[0014] ② Take water, add citric acid, and slowly add it to the mixed solution obtained in ①, and stir until the solution has no obvious stratification and becomes a slightly whitish light blue liquid to obtain a hydrophilic and oleophobic coating.
[0015] Preferably, the stirring in step ① is carried out using a stirrer with a stirring speed of 300 to 400 r / min and a stirring time of 20 to 30 min.
[0016] Preferably, the stirring in step ② is carried out using a stirrer at a stirring speed of 300 to 800 r / min.
[0017] Preferably, the hydrophilic oleophobic powder is prepared by the following steps:
[0018] Add γ-aminopropyltriethoxysilane (KH550) to the gas silicon and disperse it evenly to obtain a dispersion. After standing, the dispersion will become transparent and light blue as a whole. Then, add perfluoroalkyl betaine and stir. After the solution is stable as a whole, use an ultrasonic disperser to pour the solution into an open container and dry it until it is completely dry and powdery to obtain a hydrophilic and oleophobic powder.
[0019] Preferably, the dispersion is carried out using a high-speed disperser, and the dispersion conditions are as follows: the number of revolutions is 2000 to 3500, and the dispersion time is 20 to 30 minutes.
[0020] Preferably, the standing time is 20 to 36 hours.
[0021] Preferably, the stirring is carried out using a stirrer with a stirring speed of 120 to 180 r / min and a stirring time of 3 to 5 hours.
[0022] Preferably, the ultrasonic disperser working conditions are as follows:
[0023] The process was carried out according to 600 g of coating, 800 W power, 2 min of ultrasonic time, and 3 s on and 3 s off as one cycle.
[0024] Preferably, the drying temperature is 40-60°C.
[0025] Compared with the existing technology, the advantages of the present invention are: perfluoroalkyl betaine has a hydrophilic-oleophobic dual functional unit, which realizes the precise control of the zwitterionic surface energy. The polar region (betaine) and the non-polar region (perfluoro chain) form an energy barrier to inhibit the adsorption of oily pollutants. It is used as a gas-silicon carrier in the hybrid network, so that the overall coating surface can be gradient-designed and molecular-level functional orientation can be achieved. KH550 modified gas-silicon, a high specific surface area functional carrier, is conducive to improving the adsorption capacity, uniformly distributing the active sites, breaking through the limit of the functional molecule loading density, enhancing dispersion and adsorption, and its specific surface area reaches 380m 2 / g, perfluorobetaine is adsorbed through hydrogen bonds and electrostatic interactions, with a loading density of 1.2mmol / g, forming a "core-shell structure" (gas silica as the core and betaine molecules as the shell); isopropoxy tris(ethylenediamino-N-ethoxy) titanate and TEOS are combined to construct an inorganic-organic hybrid network skeleton, which synergistically improves the mechanical strengthening and water permeability resistance of the gas silica betaine complex, and simultaneously achieves the mechanical strength and functional durability of the coating. DETAILED DESCRIPTION
[0026] The present invention is further described in detail below with reference to Examples and Comparative Examples.
[0027] Example 1:
[0028] Step 1: Add 50 parts of gas silicon (specific surface area greater than 300m2) to 1000 parts of water. 2 / g particle size is less than 10nm), and 10 parts of γ-aminopropyltriethoxysilane (CAS: 919-30-2 Maitu MP 200) are added, and dispersed evenly using a high-speed disperser (2000-3500 revolutions for 20min), and allowed to stand for 24h. After observing that the dispersion is transparent and light blue as a whole, 30 parts of perfluoroalkyl betaine (25% concentration purchased from Aladdin) are added and slowly stirred using a stirrer (120r / min rotation for 3h). After the solution is stabilized as a whole, an ultrasonic disperser is used (according to 600g 800W 2min switch 3S interval), the solution is poured into an open container, and dried (temperature 40°C-60°C). After it is completely dried and powdered, a hydrophilic and oleophobic powder is obtained.
[0029] Step 2: Take 15 parts of isopropoxy tris(ethylenediamino-N-ethoxy) titanate (CAS: 65380-84-9 Nanjing Nengde New Materials Technology Co., Ltd. Model TCA-K44), 200 parts of tetraethyl orthosilicate, and 50 parts of the prepared hydrophilic and oleophobic powder, add them to 400 parts of isopropanol, slowly stir and dissolve (rotation speed 300 r / min 20 min) to obtain a mixed solution.
[0030] Step 3: Take 100 parts of water, add 3 parts of citric acid (CAS: 77-92-9 purchased from Aladdin), and slowly add it to the mixed solution. Use a blender to stir (300r / min) until the solution has no obvious stratification and presents a slightly whitish light blue liquid to obtain a hydrophilic oleophobic coating.
[0031] Step 4: Take 20 parts of water, 2 parts of hydrogen peroxide, 5 parts of ethanol, and 1 part of sodium lauryl sulfate, stir them thoroughly, pour them into an ultrasonic cleaner, put in a piece of glass, and ultrasonically clean it for 20 minutes. Then take it out and wipe it dry with absorbent cotton. Then put it into a plasma cleaner for cleaning for 120 seconds, and take out the cleaned glass.
[0032] Step 5: Use a sponge to evenly apply the hydrophilic and oleophobic coating to the glass. After wiping, place the glass in a drying oven at 90°C for 1 hour.
[0033] Example 2:
[0034] Step 1: Add 25 parts of gas silicon (specific surface area greater than 300m2) to 1000 parts of water. 2 / g particle size is less than 10nm), and 5 parts of γ-aminopropyltriethoxysilane (CAS: 919-30-2 Maitu MP 200) are added, and dispersed evenly using a high-speed disperser (2000-3500 revolutions for 20min), and allowed to stand for 24h. After observing that the dispersion is transparent and light blue as a whole, 8 parts of perfluoroalkyl betaine (25% concentration purchased from Aladdin) are added and slowly stirred using a stirrer (120r / min rotation for 3h). After the solution is stabilized as a whole, an ultrasonic disperser is used (according to 600g 800W 2min switch 3S interval), the solution is poured into an open container, and dried (temperature 40°C ~ 60°C). After it is completely dried and powdered, a hydrophilic and oleophobic powder is obtained.
[0035] Step 2: Take 8 parts of isopropoxy tris(ethylenediamino-N-ethoxy) titanate (CAS: 65380-84-9, Nanjing Nengde New Materials Technology Co., Ltd., model TCA-K44), 150 parts of tetraethyl orthosilicate, and 25 parts of the prepared hydrophilic and oleophobic powder, add them to 400 parts of isopropanol, and slowly stir and dissolve (300 rpm for 20 minutes) to obtain a mixed solution.
[0036] Step 3: Take 100 parts of water, add 2 parts of citric acid (CAS: 77-92-9 purchased from Aladdin), and slowly add it to the mixed solution. Use a blender to stir (300r / min) until the solution has no obvious stratification and presents a slightly whitish light blue liquid to obtain a hydrophilic oleophobic coating.
[0037] Step 4: Take 20 parts of water, 2 parts of hydrogen peroxide, 5 parts of ethanol, and 1 part of sodium lauryl sulfate, stir them thoroughly, pour them into an ultrasonic cleaner, put in a piece of glass, and ultrasonically clean it for 20 minutes. Then take it out and wipe it dry with absorbent cotton. Then put it into a plasma cleaner for cleaning for 120 seconds, and take out the cleaned glass.
[0038] Step 5: Use a sponge to evenly apply the hydrophilic and oleophobic coating to the glass. After wiping, place the glass in a drying oven at 90°C for 1 hour.
[0039] Example 3:
[0040] Step 1: Add 80 parts of silica (specific surface area greater than 300m2) to 1000 parts of water. 2 / g particle size is less than 10nm), and 25 parts of γ-aminopropyltriethoxysilane (CAS: 919-30-2 Maitu MP 200) are added, and dispersed evenly using a high-speed disperser (2000-3500 revolutions for 20min), and allowed to stand for 24h. After observing that the dispersion is transparent and light blue as a whole, 50 parts of perfluoroalkyl betaine (25% concentration purchased from Aladdin) are added and slowly stirred using a stirrer (120r / min rotation for 3h). After the solution is stabilized as a whole, an ultrasonic disperser is used (according to 600g 800W 2min switch 3S interval), the solution is poured into an open container, and dried (temperature 40℃~60℃). After it is completely dried and powdered, a hydrophilic and oleophobic powder is obtained.
[0041] Step 2: Take 30 parts of isopropoxy tris(ethylenediamino-N-ethoxy) titanate (CAS: 65380-84-9, Nanjing Nengde New Materials Technology Co., Ltd., model TCA-K44), 340 parts of tetraethyl orthosilicate, and 70 parts of the prepared hydrophilic and oleophobic powder, add them to 400 parts of isopropanol, and slowly stir and dissolve (300 rpm for 20 minutes) to obtain a mixed solution.
[0042] Step 3: Take 100 parts of water, add 5 parts of citric acid (CAS: 77-92-9 purchased from Aladdin), and slowly add it to the mixed solution. Use a blender to stir (300r / min) until the solution has no obvious stratification and presents a slightly whitish light blue liquid to obtain a hydrophilic oleophobic coating.
[0043] Step 4: Take 20 parts of water, 2 parts of hydrogen peroxide, 5 parts of ethanol, and 1 part of sodium lauryl sulfate, stir them thoroughly, pour them into an ultrasonic cleaner, put in a piece of glass, and ultrasonically clean it for 20 minutes. Then take it out and wipe it dry with absorbent cotton. Then put it into a plasma cleaner for cleaning for 120 seconds, and take out the cleaned glass.
[0044] Step 5: Use a sponge to evenly apply the hydrophilic and oleophobic coating to the glass. After wiping, place the glass in a drying oven at 90°C for 1 hour.
[0045] Example 4:
[0046] Step 1: Add 50 parts of gas silicon (specific surface area greater than 300m2) to 1000 parts of water. 2 / g particle size is less than 10nm), and 10 parts of γ-aminopropyltriethoxysilane (CAS: 919-30-2 Maitu MP 200) are added, and dispersed evenly using a high-speed disperser (2000-3500 revolutions for 20min), and allowed to stand for 24h. After observing that the dispersion is transparent and light blue as a whole, 30 parts of perfluoroalkyl betaine (25% concentration purchased from Aladdin) are added and slowly stirred using a stirrer (120r / min rotation for 3h). After the solution is stabilized as a whole, an ultrasonic disperser is used (according to 600g 800W 2min switch 3S interval), the solution is poured into an open container, and dried (temperature 40°C-60°C). After it is completely dried and powdered, a hydrophilic and oleophobic powder is obtained.
[0047] Step 2: Take 20 parts of 3-diethylenetriaminepropyltrimethylsilane (CAS 35141-30-1), 200 parts of tetraethyl orthosilicate, and 50 parts of the prepared hydrophilic and oleophobic powder, add them to 400 parts of isopropyl alcohol, and slowly stir and dissolve (300 rpm for 20 minutes) to obtain a mixed solution.
[0048] Step 3: Take 100 parts of water, add 3 parts of citric acid (CAS: 77-92-9 purchased from Aladdin), and slowly add it to the mixed solution. Use a blender to stir (300r / min) until the solution has no obvious stratification and presents a slightly whitish light blue liquid to obtain a hydrophilic oleophobic coating.
[0049] Step 4: Take 20 parts of water, 2 parts of hydrogen peroxide, 5 parts of ethanol, and 1 part of sodium lauryl sulfate, stir them thoroughly, pour them into an ultrasonic cleaner, put in a piece of glass, and ultrasonically clean it for 20 minutes. Then take it out and wipe it dry with absorbent cotton. Then put it into a plasma cleaner for cleaning for 120 seconds, and take out the cleaned glass.
[0050] Step 5: Use a sponge to evenly apply the hydrophilic and oleophobic coating to the glass. After wiping, place the glass in a drying oven at 90°C for 1 hour.
[0051] Example 5:
[0052] Step 1: Add 50 parts of silica (specific surface area greater than 300m2) to 1000 parts of water. 2 / g particle size is less than 10nm), and 10 parts of γ-aminopropyltriethoxysilane (CAS: 919-30-2 Maitu MP 200) are added, and dispersed evenly using a high-speed disperser (2000-3500 revolutions for 20min), and allowed to stand for 24h. After observing that the dispersion is transparent and light blue as a whole, 30 parts of perfluoroalkyl betaine (25% concentration purchased from Aladdin) are added and slowly stirred using a stirrer (120r / min rotation for 3h). After the solution is stabilized as a whole, an ultrasonic disperser is used (according to 600g 800W 2min switch 3S interval), the solution is poured into an open container, and dried (temperature 40°C-60°C). After it is completely dried and powdered, a hydrophilic and oleophobic powder is obtained.
[0053] Step 2: Take 15 parts of 3-diethylenetriaminepropyltrimethylsilane (CAS 35141-30-1), 200 parts of tetraethyl orthosilicate, and 50 parts of the prepared hydrophilic and oleophobic powder, add them to 400 parts of isopropanol, and slowly stir and dissolve (300 rpm for 20 minutes) to obtain a mixed solution.
[0054] Step 3: Take 100 parts of water, add 3 parts of citric acid (CAS: 77-92-9 purchased from Aladdin), and slowly add it to the mixed solution. Use a blender to stir (300r / min) until the solution has no obvious stratification and presents a slightly whitish light blue liquid to obtain a hydrophilic oleophobic coating.
[0055] Step 4: Take 20 parts of water, 2 parts of hydrogen peroxide, 5 parts of ethanol, and 1 part of sodium lauryl sulfate, stir them thoroughly, pour them into an ultrasonic cleaner, put in a piece of glass, and ultrasonically clean it for 20 minutes. Then take it out and wipe it dry with absorbent cotton. Then put it into a plasma cleaner for cleaning for 120 seconds, and take out the cleaned glass.
[0056] Step 5: Use a sponge to evenly apply the hydrophilic and oleophobic coating to the glass. After wiping, place the glass in a drying oven at 90°C for 1 hour.
[0057] Example 6:
[0058] Step 1: Add 50 parts of gas silicon (specific surface area greater than 300m2) to 1000 parts of water. 2 / g particle size is less than 10nm), and 10 parts of γ-aminopropyltriethoxysilane (CAS: 919-30-2 Maitu MP 200) are added, and dispersed evenly using a high-speed disperser (2000-3500 revolutions for 20min), and allowed to stand for 24h. After observing that the dispersion is transparent and light blue as a whole, 30 parts of perfluoroalkyl betaine (25% concentration purchased from Aladdin) are added and slowly stirred using a stirrer (120r / min rotation for 3h). After the solution is stabilized as a whole, an ultrasonic disperser is used (according to 600g 800W 2min switch 3S interval), the solution is poured into an open container, and dried (temperature 40°C-60°C). After it is completely dried and powdered, a hydrophilic and oleophobic powder is obtained.
[0059] Step 2: Take 35 parts of 3-diethylenetriaminepropyltrimethylsilane (CAS 35141-30-1), 200 parts of tetraethyl orthosilicate, and 50 parts of the prepared hydrophilic and oleophobic powder, add them to 400 parts of isopropanol, and slowly stir and dissolve (300 rpm for 20 minutes) to obtain a mixed solution.
[0060] Step 3: Take 100 parts of water, add 3 parts of citric acid (CAS: 77-92-9 purchased from Aladdin), and slowly add it to the mixed solution. Use a blender to stir (300r / min) until the solution has no obvious stratification and presents a slightly whitish light blue liquid to obtain a hydrophilic oleophobic coating.
[0061] Step 4: Take 20 parts of water, 2 parts of hydrogen peroxide, 5 parts of ethanol, and 1 part of sodium lauryl sulfate, stir them thoroughly, pour them into an ultrasonic cleaner, put in a piece of glass, and ultrasonically clean it for 20 minutes. Then take it out and wipe it dry with absorbent cotton. Then put it into a plasma cleaner for cleaning for 120 seconds, and take out the cleaned glass.
[0062] Step 5: Use a sponge to evenly apply the hydrophilic and oleophobic coating to the glass. After wiping, place the glass in a drying oven at 90°C for 1 hour.
[0063] Comparative Example 1:
[0064] Step 1: Add 50 parts of gas silicon (specific surface area greater than 300m2) to 1000 parts of water. 2 / g particle size less than 10nm) and 10 parts of γ-aminopropyltriethoxysilane (CAS: 919-30-2 Maitu MP 200) were added and uniformly dispersed using a high-speed disperser (2000-3500 rpm for 20 minutes). The dispersion was allowed to stand for 24 hours. After the dispersion was observed to be transparent and light blue, an ultrasonic disperser (600g, 800W, 2 minutes, 3 seconds on and off) was used to pour the solution into an open container and dry it at 40°C-60°C. After it was completely dry and powdery, a hydrophilic and oleophobic powder was obtained.
[0065] Step 2: Take 15 parts of isopropoxy tris(ethylenediamino-N-ethoxy) titanate (CAS: 65380-84-9, Nanjing Nengde New Materials Technology Co., Ltd., model TCA-K44), 200 parts of tetraethyl orthosilicate, and 50 parts of the prepared hydrophilic and oleophobic powder, add them to 400 parts of isopropanol, and slowly stir and dissolve (300 rpm for 20 minutes) to obtain a mixed solution.
[0066] Step 3: Take 100 parts of water, add 3 parts of citric acid (CAS: 77-92-9 purchased from Aladdin), and slowly add it to the mixed solution. Use a blender to stir (300r / min) until the solution has no obvious stratification and presents a slightly whitish light blue liquid to obtain a hydrophilic oleophobic coating.
[0067] Step 4: Take 20 parts of water, 2 parts of hydrogen peroxide, 5 parts of ethanol, and 1 part of sodium lauryl sulfate, stir them thoroughly, pour them into an ultrasonic cleaner, put in a piece of glass, and ultrasonically clean it for 20 minutes. Then take it out and wipe it dry with absorbent cotton. Then put it into a plasma cleaner for cleaning for 120 seconds, and take out the cleaned glass.
[0068] Step 5: Use a sponge to evenly apply the hydrophilic and oleophobic coating to the glass. After wiping, place the glass in a drying oven at 90°C for 1 hour.
[0069] Comparative Example 2:
[0070] Step 1: Add 50 parts of gas silicon (specific surface area greater than 300m2) to 1000 parts of water. 2 / g particle size is less than 10nm), and 10 parts of γ-aminopropyltriethoxysilane (CAS: 919-30-2 Maitu MP 200) are added, and dispersed evenly using a high-speed disperser (2000-3500 revolutions for 20min), and allowed to stand for 24h. After observing that the dispersion is transparent and light blue as a whole, 30 parts of perfluoroalkyl betaine (25% concentration purchased from Aladdin) are added and slowly stirred using a stirrer (120r / min rotation for 3h). After the solution is stabilized as a whole, an ultrasonic disperser is used (according to 600g 800W 2min switch 3S interval), the solution is poured into an open container, and dried (temperature 40°C-60°C). After it is completely dried and powdered, a hydrophilic and oleophobic powder is obtained.
[0071] Step 2: Add 200 parts of tetraethyl orthosilicate and 50 parts of the prepared hydrophilic and oleophobic powder into 400 parts of isopropyl alcohol, and slowly stir and dissolve (at a speed of 300 r / min for 20 minutes) to obtain a mixed solution.
[0072] Step 3: Take 100 parts of water, add 3 parts of citric acid (CAS: 77-92-9 purchased from Aladdin), and slowly add it to the mixed solution. Use a blender to stir (300r / min) until the solution has no obvious stratification and presents a slightly whitish light blue liquid to obtain a hydrophilic oleophobic coating.
[0073] Step 4: Take 20 parts of water, 2 parts of hydrogen peroxide, 5 parts of ethanol, and 1 part of sodium lauryl sulfate, stir them thoroughly, pour them into an ultrasonic cleaner, put in a piece of glass, and ultrasonically clean it for 20 minutes. Then take it out and wipe it dry with absorbent cotton. Then put it into a plasma cleaner for cleaning for 120 seconds, and take out the cleaned glass.
[0074] Step 5: Use a sponge to evenly apply the hydrophilic and oleophobic coating to the glass. After wiping, place the glass in a drying oven at 90°C for 1 hour.
[0075] Comparative Example 3:
[0076] Step 1: Add 50 parts of gas silicon (specific surface area less than 100m2) to 1000 parts of water. 2 / g particle size of 50-100nm), and add 10 parts of γ-aminopropyltriethoxysilane (CAS: 919-30-2 Maitu MP 200), use a high-speed disperser to disperse evenly (2000-3500 revolutions for dispersion 20min), let it stand for 24h, observe that the dispersion is transparent and light blue as a whole, then add 30 parts of perfluoroalkyl betaine (25% concentration purchased from Aladdin), and stir slowly with a stirrer (120r / min rotation for 3h). After the solution is stable as a whole, use an ultrasonic disperser (according to 600g 800W 2min switch 3S interval), pour the solution into an open container, and dry it (temperature 40℃-60℃). After it is completely dried and powdered, a hydrophilic and oleophobic powder is obtained.
[0077] Step 2: Take 15 parts of isopropoxy tris(ethylenediamino-N-ethoxy) titanate (CAS: 65380-84-9, Nanjing Nengde New Materials Technology Co., Ltd., model TCA-K44), 200 parts of tetraethyl orthosilicate, and 50 parts of the prepared hydrophilic and oleophobic powder, add them to 400 parts of isopropanol, and slowly stir and dissolve (300 rpm for 20 minutes) to obtain a mixed solution.
[0078] Step 3: Take 100 parts of water, add 3 parts of citric acid (CAS: 77-92-9 purchased from Aladdin), and slowly add it to the mixed solution. Use a blender to stir (300r / min) until the solution has no obvious stratification and presents a slightly whitish light blue liquid to obtain a hydrophilic oleophobic coating.
[0079] Step 4: Take 20 parts of water, 2 parts of hydrogen peroxide, 5 parts of ethanol, and 1 part of sodium lauryl sulfate, stir them thoroughly, pour them into an ultrasonic cleaner, put in a piece of glass, and ultrasonically clean it for 20 minutes. Then take it out and wipe it dry with absorbent cotton. Then put it into a plasma cleaner for cleaning for 120 seconds, and take out the cleaned glass.
[0080] Step 5: Use a sponge to evenly apply the hydrophilic and oleophobic coating to the glass. After wiping, place the glass in a drying oven at 90°C for 1 hour.
[0081] Test results:
[0082]
[0083]
[0084] Conclusion: Examples 1, 2, 3, 4, 5, and 6 all achieved relatively good hydrophilicity and oleophobicity, and no obvious hydrophilicity attenuation occurred after immersion in water at 60°C for 48 hours. Comparing Examples 4, 5, and 6, it was found that the more 3-diethylenetriaminepropyltrimethylsilane (CAS35141-30-1) was added, the worse the oleophobicity was, and the better the blister resistance was. Comparing Example 1 with Comparative Example 1, the addition of perfluoroalkyl betaine will rapidly change the surface energy, and rapidly change the hydrophilic angle and oleophobic angle. The addition of titanate can ensure that the water resistance of the material is greatly increased. Comparing Example 1 with Comparative Example 1, the change in the water contact angle of large-particle silica on the surface is limited. This is because it is difficult to disperse itself, resulting in uneven distribution of perfluoroalkyl betaine.
[0085] Test method:
[0086] Oil contact angle: Fulinmen rapeseed oil was tested using a Shengding SC-350h multi-function contact angle tester, with a test oil droplet size of 5 μl.
[0087] Water contact angle: Pure water is tested using a Shengding SC-350h multi-function contact angle tester, and the test water drop size is 5 microliters.
[0088] Wear resistance test: The grinding test material is steel wool, the grinding head size is 20mm*20mm, 10% White Cat dishwashing liquid is used as the friction medium, the load is 1000g, and it is rubbed 10,000 times.
[0089] 60℃ 48h water blister test: Heat water to 60℃ in a water bath, immerse the glass in 60℃ water, take it out and wipe it dry after 48 hours, and test the water contact angle.
Claims
1. A hydrophilic oleophobic easy-to-clean coating, characterized in that Includes the following components and their weight ratios The aforementioned hydrophilic oleophobic powder includes the following components and their weight ratios: 25-80 parts of gaseous silicon; 5-25 parts of γ-aminopropyltriethoxysilane; 8-50 parts of perfluoroalkyl betaine.
2. The hydrophilic and oleophobic easy-to-clean coating according to claim 1, characterized in that The alcohol organic solvent is at least one of isopropyl alcohol, propylene glycol, ethanol, methanol and propanol.
3. A method for preparing the hydrophilic and oleophobic easy-to-clean coating according to claim 1 or 2, comprising the following steps: ① Take isopropoxy tris(ethylenediamino-N-ethoxy) titanate, tetraethyl orthosilicate and hydrophilic oleophobic powder, add them to an alcohol organic solvent, stir and dissolve them to obtain a mixed solution; ② Take water, add citric acid, and slowly add it to the mixed solution obtained in ①, and stir until the solution has no obvious stratification and becomes a slightly whitish light blue liquid to obtain a hydrophilic and oleophobic coating.
4. The preparation method according to claim 3, wherein The stirring in step ① is carried out by a stirrer at a stirring speed of 300 to 400 r / min and a stirring time of 20 to 30 min.
5. The preparation method according to claim 3, characterized in that The stirring in step ② is carried out by a stirrer at a stirring speed of 300 to 800 r / min.
6. The preparation method according to claim 3, wherein The hydrophilic oleophobic powder is prepared by the following steps: Add γ-aminopropyltriethoxysilane to the gas silicon and disperse it evenly to obtain a dispersion. After standing, the dispersion will become transparent and light blue as a whole. Then, add perfluoroalkyl betaine and stir. After the solution is stable as a whole, use an ultrasonic disperser to pour the solution into an open container and dry it until it is completely dry and powdery to obtain a hydrophilic and oleophobic powder.
7. The preparation method according to claim 6, characterized in that The dispersion is carried out using a high-speed disperser, and the dispersion conditions are as follows: the number of revolutions is 2000 to 3500 revolutions, and the dispersion time is 20 to 30 minutes.
8. The preparation method according to claim 6, characterized in that The standing time is 20 to 36 hours.
9. The preparation method according to claim 6, characterized in that The stirring is carried out using a stirrer with a stirring speed of 120 to 180 r / min and a stirring time of 3 to 5 hours.
10. The preparation method according to claim 6, characterized in that The working conditions of the ultrasonic disperser are as follows: The process was carried out according to 600 g of coating, 800 W power, 2 min of ultrasonic time, and 3 s on and 3 s off as one cycle.
11. The preparation method according to claim 6, characterized in that The drying temperature is 40-60°C.