Cleaning method of AF anti-fingerprint oil

Abstract

The invention discloses an AF anti-fingerprint oil cleaning method, which comprises cleaning agent scrubbing, alkali washing, water washing and diluent scrubbing, the alkali washing comprises roll scrubbing and spray leaching, and the water washing comprises high-pressure spray leaching and spray leaching; the diluent is prepared from the following components in percentage by mass: 40 to 60 percent of ethyl perfluoroisobutyl ether and 40 to 60 percent of ethyl perfluorobutyl ether. According to the cleaning agent, the principle that an AF oil main agent, namely a perfluoropolyether (PFPE) polymer, is easily dissolved in ethyl perfluoroisobutyl ether and ethyl perfluorobutyl ether, and the characteristic that ethyl perfluoroisobutyl ether and ethyl perfluorobutyl ether are easily volatilized are utilized, stubborn oil stains remaining on the surface of the glass cover plate can be removed, stubborn residual oil which is difficult to remove through the cleaning agent can be deeply removed, and the cleaning agent has a good cleaning effect on the surface of the glass cover plate. The surface of the glass product is free of particles and dirt, the shipment requirement is met, and meanwhile the wear resistance of the glass product is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of AF glass processing, and in particular relates to a method for cleaning AF anti-fingerprint oil. Background Art

[0002] AF glass, also known as anti-fingerprint glass, refers to a layer of fluorine-containing coating made of fluorosilicone resin with a special structure coated on the glass surface - AF film, which makes the glass have anti-fouling, insulation, acid resistance, anti-fingerprint and other properties. It also has the characteristics of high hardness and scratch resistance, low dynamic friction coefficient, good adhesion, thin film formation, high transmittance, etc. It can be used on the protective glass of high-end digital products such as smart phones, tablets, cameras, industrial control displays, car displays and televisions. It has a smooth touch, is anti-fouling and easy to clean, and can maintain the quality of the product for a long time.

[0003] When forming an AF film on the glass surface, spraying or electroplating processes are generally used, which can form a good AF film on the glass surface. However, these processes are likely to leave a certain amount of oily raw materials on the surface of the AF film, referred to as AF oil. The excess AF oil remaining on the glass needs to be cleaned before the next step. The traditional cleaning method is to wipe with glass water and alcohol, but its work efficiency is extremely low. At the same time, alcohol is highly volatile and has a pungent smell, which has a great impact on employee operations; and its cleaning effect is not good. There are still residual AF errors on the glass, and it is necessary to manually remove the oil by hard wiping with a dust-free cloth. The efficiency is even lower. The hard wiping method inspects the production capacity of only 40 PCS per hour of wiping + inspection by the inspector, and it is easy to cause injuries or scratches during the wiping process.

[0004] Chinese patent CN104772313A discloses a method for cleaning a sapphire wafer after coating, comprising cleaning it with a flat cleaning machine including an assembly line, a spray device and a roller brush device, wherein the cleaning steps include step A, detergent roller brush spray washing, step B, high-temperature pure water spray washing, step C, low-temperature pure water spray washing, and step D, air knife drying. The method solves the problem that sapphire can only be cleaned manually and is difficult to clean after coating in the prior art, and the cleanliness and production efficiency of sapphire wafer products are improved by using the method of the present invention, and the time waste caused by wiping action and the pungent smell caused by organic solvents are avoided. However, the method is suitable for cleaning sapphire wafers after coating. In view of the different compositions and processes of AF oil on glass, the method cannot be directly used to clean the residual AF oil on the glass, and the residual AF oil on the glass surface cannot be completely removed by only flat cleaning.

[0005] Chinese patent CN109370797A discloses a neutral cleaning agent for mobile phone cover glass, which includes the following raw materials by weight: 2-5 parts of complexing agent, 10-15 parts of dispersant, 2-8 parts of surfactant, 0.05-1 part of antifoaming agent, 1-3 parts of special surfactant, and deionized water to 100 parts, wherein the surfactant is a fluorine-polyether modified silicone surfactant, with a surface tension of less than 18mN / m and extremely high cleaning ability. However, in fact, after the fluorine-polyether modified silicone surfactant is diluted with water, it is impossible to completely remove the residual oil on the glass surface.

[0006] Therefore, it is necessary to provide an efficient cleaning method to reduce the dependence on manual labor in order to solve the problem that oil stains on the surface of AF glass cover are difficult to remove. Summary of the invention

[0007] In view of the above technical problems, the present invention provides a method for cleaning AF anti-fingerprint oil, which can solve the problem that oil stains on the surface of AF glass cover are difficult to remove.

[0008] In order to achieve the above object, the present invention provides a method for cleaning AF anti-fingerprint oil, comprising the following steps: (1) Cleaning with detergent: Use detergent to clean the glass AF surface at 1.0-1.5kgf; (2) Alkali cleaning: Use 4-7% by mass of alkaline cleaning agent to roll and spray wash the glass; (3) Water washing: Use water to spray the glass with high pressure and then dry it; (4) Wiping with thinner: Wipe the glass with thinner to remove stubborn residual oil stains and obtain AF glass.

[0009] Preferably, the cleaning agent in step (1) is any one of dishwashing liquid, neutral glass cleaning agent and alkaline glass cleaning agent.

[0010] Further preferably, the pH value of the neutral glass cleaning agent is 7.0±1.0; the pH value of the alkaline glass cleaning agent is 13.0±1.0.

[0011] Preferably, the scrubbing method described in step (1) is to perform a cross-grinding on the glass surface along the X-axis and the Y-axis for one circle each.

[0012] Preferably, the temperature of the roller brushing in step (2) is 45±5°C and the pressure is 2±0.5kg / cm 2 , cleaning speed is 2±1m / min.

[0013] Preferably, the spray washing temperature in step (2) is 45±5°C, the pressure is 5±1kg / cm², the cleaning speed is 2±1m / min; and the upper spray pressure is ≥ the lower spray pressure.

[0014] Preferably, the pH value of the alkaline cleaning solution in step (2) is 13.0±1.0.

[0015] Preferably, the temperature of the high-pressure spray washing in step (3) is 45±5°C and the pressure is 5±1kg / cm 2 , cleaning speed is 2±1m / min; upper spray pressure ≥ lower spray pressure; spray temperature is 25±5℃, pressure is 2±0.5kg / cm 2 , cleaning speed is 2±1m / min; upper spray pressure ≥ lower spray pressure.

[0016] Preferably, the diluent in step (4) is composed of 40-60% by mass of ethyl perfluoroisobutyl ether and 40-60% by mass of ethyl perfluorobutyl ether. The wiping time is 2-5 seconds.

[0017] Preferably, the glass described in step (1) is any one of white glass+AF, AG glass+AF, AR glass+AF and AG glass+AR glass+AF cover glass.

[0018] Further preferably, the white glass is normal white glass or ultra white glass.

[0019] The beneficial effects of the present invention are: 1. Mix ethyl perfluoroisobutyl ether and ethyl perfluorobutyl ether as diluents. Utilizing the principle that the main agent of AF oil - perfluoropolyether (PFPE) polymer is easily soluble in ethyl perfluoroisobutyl ether and ethyl perfluorobutyl ether, and the characteristics of ethyl perfluoroisobutyl ether and ethyl perfluorobutyl ether being volatile, it can help to clear the stubborn oil stains remaining on the surface of the glass cover plate, deeply remove the stubborn residual oil that is difficult to be removed by cleaning agents, make the surface of the glass product free of particles and dirt, meet the shipping requirements, and at the same time do not affect the wear resistance of the glass product.

[0020] 2. Use cleaning agent wiping, two-step alkaline washing + two-step water washing process to remove most of the residual oil on the surface of the glass cover, improve the cleaning efficiency, reduce the pressure of diluent wiping and the amount of diluent used, improve the removal effect of AF oil on the glass surface, and reduce the dependence on manual hard wiping, improve efficiency, and reduce the defect rate such as scratches caused by the manual wiping process. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further explained below in conjunction with specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of the present invention and should not be construed as limiting the present invention. The protection scope of the present invention shall be subject to the contents recorded in the claims. Any modification or replacement made by a person skilled in the art to the technical solution of the present invention without creative work shall fall within the protection scope of the present invention.

[0022] In the following examples, the dishwashing liquid was purchased from Vitality 28; Glass neutral cleaning agent was purchased from Shenzhen Aoxinyuan Technology Co., Ltd. or Shenzhen Feishier New Materials Co., Ltd., with batch numbers of Aoxinyuan BZ308, Aoxinyuan BZ200, and Feishier 2000-9B respectively; The glass alkaline cleaning agent was purchased from Dongguan Hill Metal Materials Co., Ltd., Shenzhen Aoxinyuan Technology Co., Ltd. or Dongguan Sihui Surface Treatment Technology Co., Ltd., with batch numbers of Hill GX-18BT, Aoxinyuan BJ100 and Sihui SH-BB11 respectively.

[0023] Example 1 (1) Cleaning agent: Use high-density sponge (density 45Kg / m 3 ) Dip in detergent and polish the AF surface of the 3A cover glass (AG+AR+AF) in the X-axis and Y-axis respectively to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.0kgf; (2) Alkaline brush cleaning: Use Hill GX-18BT alkaline cleaning agent (4% by mass) to perform brush cleaning at 45°C, with a brush pressure of 2.0 kg / cm 2 , cleaning speed is 2m / min; (3) Spray alkaline cleaning: Use Hill GX-18BT alkaline cleaning agent (4% by mass) to spray up and down at 45°C, with a cleaning speed of 2m / min; the spray pressure is 5.0kg / cm 2 , and the upper spray pressure ≥ the lower spray pressure; (4) High-pressure spray washing: Use pure water at 45°C for high-pressure spray washing up and down, with a cleaning speed of 2m / min and a spray pressure of 5.0kg / cm 2 , and the upper spray pressure ≥ the lower spray pressure; (5) Spray water washing: Use pure water to spray up and down at 20°C, the cleaning speed is 2m / min, and the spray pressure is 2.0 kg / cm 2 , and the upper spray pressure ≥ the lower spray pressure; (6) Cutting and drying: Use air knives to blow dry from both the upper and lower directions, with the upper air knife pressure ≥ the lower air knife pressure; (7) Thinner scrubbing: Use a dust-free cloth dipped in thinner to gently wipe to remove stubborn residual oil stains and obtain 3A glass; wherein the thinner is composed of 50% by mass of ethyl perfluorobutyl ether and 50% by mass of ethyl perfluoroisobutyl ether.

[0024] Example 2 The method and steps are the same as those in Example 1, except that the diluent formula in step (7) is changed to consist of 30% by mass of ethyl perfluorobutyl ether and 70% by mass of ethyl perfluoroisobutyl ether, to prepare 3A glass.

[0025] Example 3 The method and steps are the same as those in Example 1, except that the diluent formula in step (7) is changed to consist of 70% by mass of ethyl perfluorobutyl ether and 30% by mass of ethyl perfluoroisobutyl ether, to prepare 3A glass.

[0026] Example 4 (1) Cleaning agent: Use high-density sponge (density 45Kg / m 3 ) Dip in detergent and polish the AF surface of the 3A cover glass (AG+AR+AF) in the X-axis and Y-axis respectively to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.5kgf; (2) Alkaline roller cleaning: Use Hill GX-18BT alkaline cleaning agent (7% by mass) to perform roller cleaning at 40°C with a roller pressure of 1.5 kg / cm 2 , cleaning speed is 3m / min; (3) Spray alkaline cleaning: Use Hill GX-18BT alkaline cleaning agent (mass percentage 7%), spray up and down at 40°C, with a spray pressure of 4 kg / cm 2 , the cleaning speed is 3m / min, and the upper spray pressure ≥ the lower spray pressure; (4) High-pressure spray washing: Use pure water at 40°C for high-pressure spray washing up and down, with a spray pressure of 4kg / cm 2 , the cleaning speed is 3m / min, and the upper spray pressure ≥ the lower spray pressure; (5) Spray water washing: Use pure water to spray up and down at 25°C, the cleaning speed is 3m / min, and the spray pressure is 1.5 kg / cm 2 , and the upper spray pressure ≥ the lower spray pressure; (6) Cutting and drying: Use air knives to blow dry from both the upper and lower directions, with the upper air knife pressure ≥ the lower air knife pressure; (7) Thinner scrubbing: Use a dust-free cloth dipped in thinner to gently wipe to remove stubborn residual oil stains and obtain 3A glass; wherein the thinner is composed of 50% by mass of ethyl perfluorobutyl ether and 50% by mass of ethyl perfluoroisobutyl ether.

[0027] Example 5 (1) Cleaning agent: Use high-density sponge (density 45Kg / m 3 ) Dip in detergent and polish the AF surface of the 3A cover glass (AG+AR+AF) in the X-axis and Y-axis respectively to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.2kgf; (2) Alkaline roller brush cleaning: Use Hill GX-18BT alkaline cleaning agent (5% by mass) to perform roller brush cleaning at 50°C, with a roller brush pressure of 2.5 kg / cm 2 , cleaning speed is 1m / min; (3) Spray alkaline cleaning: Use Hill GX-18BT alkaline cleaning agent (mass percentage 7%), spray up and down at 50°C, the cleaning speed is 1m / min, and the spray pressure is 6 kg / cm 2 , and the upper spray pressure ≥ the lower spray pressure; (4) High-pressure spray washing: Use pure water at 40°C for high-pressure spray washing up and down, with a cleaning speed of 1m / min and a spray pressure of 6kg / cm 2 , and the upper spray pressure ≥ the lower spray pressure; (5) Spray washing: Use pure water to spray up and down at 25°C, the cleaning speed is 1m / min, the spray pressure is 2.5 kg / cm², and the upper spray pressure is ≥ the lower spray pressure; (6) Cutting and drying: Use air knives to blow dry from both the upper and lower directions, with the upper air knife pressure ≥ the lower air knife pressure; (7) Thinner scrubbing: Use a dust-free cloth dipped in thinner to gently wipe to remove stubborn residual oil stains and obtain 3A glass; wherein the thinner is composed of 50% by mass of ethyl perfluorobutyl ether and 50% by mass of ethyl perfluoroisobutyl ether.

[0028] Comparative Example 1 The method and steps are the same as those in Example 1, except that the diluent formula in step (7) is changed to consist entirely of perfluoroheptane to prepare 3A glass.

[0029] Comparative Example 2 The method and steps are the same as those in Example 1, except that the diluent formula in step (7) is changed to consist entirely of hexafluoropropylene trimer to prepare 3A glass.

[0030] Comparative Example 3 The method and steps are the same as those in Example 1, except that the diluent formula in step (7) is changed to consist entirely of ethyl perfluorobutyl ether to prepare 3A glass.

[0031] Comparative Example 4 The method and steps are the same as those in Example 1, except that the diluent formula in step (7) is changed to consist entirely of ethyl perfluoroisobutyl ether to prepare 3A glass.

[0032] Comparative Example 5 The method and steps are the same as those in Example 1, except that the diluent in step (7) is replaced by alcohol (99% industrial alcohol) to prepare 3A glass.

[0033] Comparative Example 6 The method and steps are the same as those in Example 1, except that step (7) is omitted, and 3A glass is prepared.

[0034] Results: The 3A glass prepared in the above examples and comparative examples was tested for reflection / transmission at 1000 Lux. The test method was that the glass was 45° to the tabletop under a black background and flat light. From top to bottom, the vertical rotation angle was ±45°; from left to right, the horizontal rotation angle was ±45°. The time required to wipe with a diluent when the surface was free of particles and dirt and met the shipping requirements was calculated (Table 1). During the test, the glass was 30 cm away from the eyes and 40 cm away from the light source. Table 1 Diluent and wiping time

[0035] The results show that only by using ethyl perfluorobutyl ether and ethyl perfluoroisobutyl ether as diluents can glass products that meet the requirements be obtained in a shorter time, and mixing the two in equal proportions can further reduce the wiping time.

[0036] The 3A glass prepared in Example 1 and Comparative Example 5 was tested for wear resistance using a wear tester. The test method was to use a 1 kg load and 0000# steel wool, and rub 1500 times at a frequency of 60 times / min under a contact area of ​​20 mm×20 mm. If the water drop angle reached 100° or more, the test was passed, otherwise, the test was failed. The results are shown in Table 2: Table 2 Wear resistance

[0037] The results show that the diluent formula used in Examples 1-3 has no significant effect on the AF water drop angle of the 3A glass cover, and therefore has no effect on the friction resistance of the glass. After being cleaned with AF anti-fingerprint oil, it can still maintain a high wear resistance and meet the use requirements.

[0038] Comparative Example 7 (1) Alkaline roller cleaning: Use Hill GX-18BT alkaline cleaning agent (4% by mass) to roller clean 3A cover glass (AG+AR+AF) at 45°C, with a roller pressure of 2.0kg / cm² and a cleaning speed of 2m / min; (2) Spray alkali cleaning: using Hill GX-18BT alkaline cleaning agent (4% by mass), the glass obtained in step (1) is sprayed and cleaned from top to bottom at 45°C, with a cleaning speed of 2m / min, wherein the spray pressure is 5.0kg / cm², and the upper spray pressure is ≥ the lower spray pressure; (3) High-pressure spray washing: The sample obtained in step (2) is subjected to high-pressure spray washing up and down using pure water at 45°C, with a cleaning speed of 2 m / min, wherein the spray pressure is 5.0 kg / cm², and the upper spray pressure is ≥ the lower spray pressure; (4) Spraying and washing: The glass obtained in step (3) is sprayed and washed upward and downward with pure water at 20°C at a speed of 2 m / min, wherein the spraying pressure is 2.0 kg / cm², and the upper spraying pressure is ≥ the lower spraying pressure; (5) Cutting and drying: Use air knives to blow dry from both the upper and lower directions to obtain 3A glass; the upper air knife pressure ≥ the lower air knife pressure.

[0039] Comparative Example 8 (1) Cleaning with detergent: Use a high-density sponge (density 45 kg / m³) dipped in detergent to polish the AF surface of the 3A cover glass (AG+AR+AF) in the X-axis and Y-axis directions to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.0 kgf. (2) Pure water cleaning: Use pure water to spray up and down at 20°C, the cleaning speed is 2m / min, the spray pressure is 2.0 kg / cm², and the upper spray pressure ≥ the lower spray pressure; (3) Cutting and drying: Use air knives to blow dry from the upper and lower directions, where the upper air knife pressure ≥ the lower air knife pressure to obtain 3A glass.

[0040] Comparative Example 9 (1) Cleaning with detergent: Use a high-density sponge (density 45 kg / m³) dipped in detergent to polish the AF surface of the 3A cover glass (AG+AR+AF) in the X-axis and Y-axis directions to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.0 kgf. (2) Neutral cleaning agent: Use Aoxinyuan BZ308 neutral cleaning agent (4% by mass) to perform upper and lower spray washing at 45°C, with a cleaning speed of 2m / min, and a spray pressure of 5.0 kg / cm², and the upper spray pressure ≥ the lower spray pressure; (3) Cutting and drying: Use air knives to blow dry from the upper and lower directions, where the upper air knife pressure ≥ the lower air knife pressure to obtain 3A glass.

[0041] Comparative Example 10 (1) Cleaning with detergent: Use a high-density sponge (density 45 kg / m³) dipped in detergent to polish the AF surface of the 3A cover glass (AG+AR+AF) in the X-axis and Y-axis directions to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.0 kgf. (2) Spray alkaline cleaning: Use Hill GX-18BT alkaline cleaning agent (4% by mass) to spray up and down at 45°C, with a cleaning speed of 2m / min, and a spray pressure of 5.0kg / cm², and the upper spray pressure ≥ the lower spray pressure; (3) Cutting and drying: Use air knives to blow dry from the upper and lower directions, where the upper air knife pressure ≥ the lower air knife pressure to obtain 3A glass.

[0042] Results: The 3A glass prepared in Example 1 and Comparative Examples 6-10 was tested for reflection / transmission. The results are shown in Table 3: Table 3 Effect of cleaning method on cleaning effect and wiping time

[0043] The results show that after wiping with a diluent, the residual oil on the glass surface can be quickly removed, and the wiping efficiency is significantly improved (Example 1, Comparative Examples 6-7); the use of an alkaline cleaning agent is more effective in removing most of the oil on the glass surface, saving wiping time and improving glass processing efficiency (Example 1, Comparative Examples 8-10).

Claims

1. A method for cleaning AF anti-fingerprint oil, characterized in that: The steps include: (1) Cleaning with detergent: Use detergent to clean the glass AF surface at 1.0-1.5kgf; (2) Alkali cleaning: Use 4-7% by mass of alkaline cleaning agent to roll and spray wash the glass; (3) Water washing: Use water to spray the glass with high pressure and then dry it; (4) Wiping with thinner: Wipe the glass with thinner to remove stubborn residual oil stains and obtain AF glass.

2. The cleaning method of AF anti-fingerprint oil according to claim 1, characterized in that: The cleaning agent in step (1) is any one of dishwashing liquid, neutral glass cleaning agent and alkaline glass cleaning agent.

3. The cleaning method of AF anti-fingerprint oil according to claim 2, characterized in that: The pH value of the neutral glass cleaning agent is 7.0±1.0; the pH value of the alkaline glass cleaning agent is 13.0±1.

0.

4. The cleaning method of AF anti-fingerprint oil according to claim 1, characterized in that: The scrubbing method described in step (1) is to perform a cross-grinding on the glass surface along the X-axis and the Y-axis.

5. The cleaning method of AF anti-fingerprint oil according to claim 1, characterized in that: The temperature of the roller brushing in step (2) is 45±5°C and the pressure is 2±0.5kg / cm 2 .

6. The cleaning method of AF anti-fingerprint oil according to claim 1, characterized in that: The spray washing temperature in step (2) is 45±5°C, the pressure is 5±1kg / cm², and the upper spray pressure is ≥ the lower spray pressure.

7. The cleaning method of AF anti-fingerprint oil according to claim 1, characterized in that: The pH value of the alkaline cleaning solution in step (2) is 13.0±1.

0.

8. The cleaning method of AF anti-fingerprint oil according to claim 1, characterized in that: The temperature of the high-pressure spray washing in step (3) is 45±5°C and the pressure is 5±1kg / cm 2 , upper spray pressure ≥ lower spray pressure; spray washing temperature is 25±5℃, pressure is 2±0.5kg / cm 2 , upper spray pressure ≥ lower spray pressure.

9. The method for cleaning AF anti-fingerprint oil according to claim 1, characterized in that: The diluent in step (4) is composed of 40-60% by mass of ethyl perfluoroisobutyl ether and 40-60% by mass of ethyl perfluorobutyl ether; and the wiping time is 2-5s.

10. The cleaning method of AF anti-fingerprint oil according to claim 1, characterized in that: The glass described in step (1) is any one of white glass+AF, AG glass+AF, AR glass+AF and AG glass+AR glass+AF cover glass.

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