A cleaning method of AF fingerprint-proof oil

Abstract

The application discloses a cleaning method of AF fingerprint-proof oil, which comprises cleaning agent scrubbing, alkali cleaning, water washing and diluent wiping, wherein the alkali cleaning comprises rolling brush washing and spraying washing, the water washing comprises high-pressure spraying washing and spraying washing; the diluent is composed of 40-60% ethyl perfluoroisobutyl ether and 40-60% ethyl perfluorobutyl ether in mass percentage. The application can help to remove stubborn oil stains remaining on the surface of a glass cover plate, remove stubborn residual oil which is difficult to remove by a cleaning agent, and make the surface of the glass product free of particles and dirt, so as to meet the delivery requirements, and meanwhile, the wear resistance of the glass product is not affected.

Description

Technical Field

[0001] This invention belongs to the field of AF glass processing technology, and specifically relates to a method for cleaning AF anti-fingerprint oil. Background Technology

[0002] AF glass, also known as anti-fingerprint glass, refers to glass surface coated with a fluorinated coating—AF film—made of a special structured fluorosilicone resin. This coating gives the glass properties such as stain resistance, insulation, acid resistance, and fingerprint resistance. It also features high hardness and scratch resistance, low coefficient of dynamic friction, good adhesion, thin film, and high transmittance. It can be used on protective glass for high-end digital products such as smartphones, tablets, cameras, industrial control displays, automotive displays, and televisions. It has a smooth touch, is easy to clean, and can maintain the quality of the product for a long time.

[0003] When forming an AF film on a glass surface, processes such as spraying or electroplating are generally used. These processes can create a relatively good AF film on the glass surface. However, these processes tend to leave a certain amount of oily material on the surface of the AF film, referred to as AF oil. It is necessary to clean the excess AF oil on the glass before proceeding to the next step. The traditional cleaning method is to wipe with glass cleaner and alcohol, but this method is extremely inefficient. In addition, alcohol is highly volatile and has a pungent odor, which has a significant impact on the operation of employees. Moreover, the cleaning effect is not good, and residual AF defects still remain on the glass. It is necessary to manually wipe the glass with a lint-free cloth to remove the oil, which is even less efficient. With the hard wiping method, the output of wiping and inspection by inspectors is only 40 pieces per hour, and the wiping process is prone to causing damage or scratches to defects.

[0004] Chinese patent CN104772313A discloses a cleaning method for sapphire wafers after coating, which includes cleaning them with a flatbed cleaning machine containing a production line, a spray device, and a roller brush device. The cleaning steps include: step A, cleaning with detergent roller brush spray, step B, high-temperature pure water spray, step C, low-temperature pure water spray, and step D, air knife drying. This method solves the problem in the prior art that sapphire wafers after coating can only be cleaned manually and is difficult to clean. The method of this invention improves the cleanliness and production efficiency of sapphire wafer products and avoids the time wasted by wiping and the pungent odor caused by organic solvents. However, it is suitable for cleaning sapphire wafers after coating. Given that the composition and process of AF oil on glass are different, it cannot be directly used to clean residual AF oil on glass. In fact, flatbed cleaning alone cannot completely remove residual AF oil stains on the glass surface.

[0005] Chinese patent CN109370797A discloses a neutral cleaning agent for mobile phone cover glass. This cleaning agent comprises the following raw materials in parts by weight: 2-5 parts complexing agent, 10-15 parts dispersant, 2-8 parts surfactant, 0.05-1 part defoamer, 1-3 parts special surfactant, and deionized water to a total of 100 parts. The surfactant is a fluorinated polyether-modified silicone surfactant with a surface tension of less than 18 mN / m, exhibiting extremely high cleaning ability. However, in practice, even after dilution with water, the fluorinated polyether-modified silicone surfactant cannot completely remove residual AF oil stains from the glass surface.

[0006] Therefore, it is necessary to provide an efficient cleaning method to address the problem of difficult-to-remove oil stains on the surface of AF glass covers, thereby reducing reliance on manual labor. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a method for cleaning AF anti-fingerprint oil, which can solve the problem of difficult-to-remove oil stains from the surface of AF glass covers.

[0008] To achieve the above objectives, the present invention provides a method for cleaning AF anti-fingerprint oil, comprising the following steps: (1) Cleaning with cleaning agent: Clean the glass AF surface with cleaning agent at 1.0-1.5 kgf; (2) Alkaline cleaning: Use an alkaline cleaning agent with a mass percentage of 4-7% to perform roller brush cleaning and spray cleaning on the glass; (3) Water washing: High-pressure spray washing of the glass with water and drying after spray washing; (4) Thinner wiping: 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 cleaner, or alkaline glass cleaner.

[0010] More preferably, the pH value of the neutral glass cleaner is 7.0±1.0; and the pH value of the alkaline glass cleaner is 13.0±1.0.

[0011] Preferably, the wiping method described in step (1) is to perform one round of grinding along the X-axis and Y-axis on the glass surface.

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

[0013] Preferably, the spray washing temperature in step (2) is 45±5℃, the pressure is 5±1kg / cm², and the washing speed is 2±1m / min; 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℃ and the pressure is 5±1kg / cm. 2 The cleaning speed is 2±1 m / min; the upper spray pressure is ≥ the lower spray pressure; the spray temperature is 25±5℃, and the pressure is 2±0.5 kg / cm². 2 The cleaning speed is 2±1m / min; the upper spray pressure is greater than or equal to the lower spray pressure.

[0016] Preferably, the diluent in step (4) consists 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 in step (1) is any one of clear glass + AF, AG glass + AF, AR glass + AF, and AG glass + AR glass + AF cover glass.

[0018] More preferably, the white glass is ordinary white glass or ultra-white glass.

[0019] The beneficial effects of this invention are as follows: 1. Using a mixture of ethyl perfluoroisobutyl ether and ethyl perfluorobutyl ether as a diluent, taking advantage of the principle that the main component of AF oil—perfluoropolyether (PFPE) polymer—is easily soluble in ethyl perfluoroisobutyl ether and ethyl perfluorobutyl ether, and the volatile nature of ethyl perfluoroisobutyl ether and ethyl perfluorobutyl ether, can help remove stubborn oil stains remaining on the surface of glass covers, deeply remove stubborn residual oil that is difficult to remove by cleaning agents, so that the surface of glass products is free of particles and dirt, meeting the shipping requirements, while not affecting the wear resistance of glass products.

[0020] 2. By using cleaning agent wiping, two-step alkaline washing + two-step water washing process, most of the residual oil on the glass cover plate surface is removed, which improves cleaning efficiency, reduces the pressure of thinner wiping and the amount of thinner used, improves the removal effect of AF oil on the glass surface, and at the same time reduces the dependence on manual hard wiping, improves efficiency, and reduces the defect rate such as scratches caused by manual wiping process. Detailed Implementation

[0021] The technical solution of the present invention will be further explained and described below with reference to 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 scope of protection of the present invention should be determined by the contents of the claims. Modifications and substitutions made by those skilled in the art to the technical solution of the present invention without creative effort all fall within the scope of protection of the present invention.

[0022] In the following embodiments, the dishwashing liquid was purchased from Vitality 28; The glass neutral cleaner was purchased from Shenzhen Aoxinyuan Technology Co., Ltd. or Shenzhen Feishier New Material Co., Ltd., with batch numbers Aoxinyuan BZ308, Aoxinyuan BZ200, and Feishier 2000-9B, respectively. The glass alkaline cleaner 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 Hill GX-18BT, Aoxinyuan BJ100, and Sihui SH-BB11, respectively.

[0023] Example 1 (1) Cleaning with cleaning agent: Use high-density sponge (density is 45Kg / m³) 3 Apply dish soap and polish the AF surface of the 3A cover glass (AG+AR+AF) once along the X and Y axes to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.0 kgf. (2) Alkaline washing with roller brush: Use Hill GX-18BT alkaline cleaning agent (4% by mass) to perform roller brush washing at 45℃, wherein the roller brush pressure is 2.0 kg / cm 2 The cleaning speed is 2m / min; (3) Alkaline spray cleaning: Hill GX-18BT alkaline cleaning agent (4% by mass) is used for top and bottom spray cleaning at 45℃, with a cleaning speed of 2m / min; the spray pressure is 5.0kg / cm 2 And the upper spray pressure is greater than or equal to the lower spray pressure; (4) High-pressure spray washing: High-pressure spray washing is performed using pure water at 45℃, with a washing speed of 2m / min and a spray pressure of 5.0kg / cm. 2 And the upper spray pressure is greater than or equal to the lower spray pressure; (5) Spray washing: Pure water is used for top and bottom spray washing at 20℃, with a washing speed of 2m / min and a spray pressure of 2.0 kg / cm. 2 And the upper spray pressure is greater than or equal to the lower spray pressure; (6) Cutting and drying: Use air knives to blow dry from both the top and bottom, where the air pressure of the upper air knife is greater than or equal to that of the lower air knife; (7) Diluent wiping: Use a lint-free cloth dipped in diluent to wipe lightly to remove stubborn residual oil stains and obtain 3A glass; wherein the diluent is composed of 50% ethyl perfluorobutyl ether and 50% ethyl perfluoroisobutyl ether by mass.

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

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

[0026] Example 4 (1) Cleaning with cleaning agent: Use high-density sponge (density is 45Kg / m³) 3 Apply dish soap and polish the AF surface of the 3A cover glass (AG+AR+AF) once along the X and Y axes to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.5 kgf. (2) Alkaline washing with roller brush: Use Hill GX-18BT alkaline cleaning agent (7% by mass) to perform roller brush washing at 40°C, wherein the roller brush pressure is 1.5 kg / cm 2 The cleaning speed is 3m / min; (3) Alkaline spray cleaning: Hill GX-18BT alkaline cleaning agent (7% by mass) is used for top and bottom spray cleaning at 40℃, with a spray pressure of 4 kg / cm. 2 The cleaning speed is 3m / min, and the upper spray pressure is greater than or equal to the lower spray pressure. (4) High-pressure spray washing: High-pressure spray washing is performed using pure water at 40℃, with a spray pressure of 4 kg / cm². 2 The cleaning speed is 3m / min, and the upper spray pressure is greater than or equal to the lower spray pressure. (5) Spray washing: Pure water is used for top and bottom spray washing at 25℃, with a washing speed of 3m / min and a spray pressure of 1.5 kg / cm. 2 And the upper spray pressure is greater than or equal to the lower spray pressure; (6) Cutting and drying: Use air knives to blow dry from both the top and bottom, where the air pressure of the upper air knife is greater than or equal to that of the lower air knife; (7) Diluent wiping: Use a lint-free cloth dipped in diluent to wipe lightly to remove stubborn residual oil stains and obtain 3A glass; wherein the diluent is composed of 50% ethyl perfluorobutyl ether and 50% ethyl perfluoroisobutyl ether by mass.

[0027] Example 5 (1) Cleaning with cleaning agent: Use high-density sponge (density is 45Kg / m³) 3 Apply dish soap and polish the AF surface of the 3A cover glass (AG+AR+AF) once along the X and Y axes to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.2 kgf. (2) Alkaline washing with roller brush: Use Hill GX-18BT alkaline cleaning agent (5% by mass) to perform roller brush washing at 50°C, wherein the roller brush pressure is 2.5 kg / cm 2 The cleaning speed is 1m / min; (3) Alkaline spray cleaning: Hill GX-18BT alkaline cleaning agent (7% by mass) is used for top and bottom spray cleaning at 50℃, with a cleaning speed of 1m / min and a spray pressure of 6 kg / cm. 2 And the upper spray pressure is greater than or equal to the lower spray pressure; (4) High-pressure spray washing: High-pressure spray washing is performed using pure water at 40℃, with a washing speed of 1m / min and a spray pressure of 6 kg / cm. 2 And the upper spray pressure is greater than or equal to the lower spray pressure; (5) Spray washing: Use pure water to spray and wash from top to bottom at 25℃. The washing speed is 1m / min, and the spray pressure is 2.5 kg / cm², with the upper spray pressure ≥ the lower spray pressure. (6) Cutting and drying: Use air knives to blow dry from both the top and bottom, where the air pressure of the upper air knife is greater than or equal to that of the lower air knife; (7) Diluent wiping: Use a lint-free cloth dipped in diluent to wipe lightly to remove stubborn residual oil stains and obtain 3A glass; wherein the diluent is composed of 50% ethyl perfluorobutyl ether and 50% ethyl perfluoroisobutyl ether by mass.

[0028] Comparative Example 1 The method and steps are the same as in Example 1, except that the diluent formulation 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 in Example 1, except that the diluent formulation 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 in Example 1, except that the diluent formulation in step (7) is changed to consist entirely of ethyl perfluorobutyl ether, and 3A glass is prepared.

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

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

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

[0034] Results Testing: The 3A glass prepared in the above examples and comparative examples was tested for reflectivity / transmittance at 1000 Lux. The testing method was as follows: with a black background and flat light, the glass was at a 45° angle to the tabletop, and rotated vertically from top to bottom at ±45°; and horizontally from left to right at ±45°. The time required to wipe the surface with a thinner when it was free of particles and dirt and met the shipping requirements was recorded (Table 1). During the test, the glass was 30cm away from the eyes and 40cm away from the light source. Table 1. Diluent and Wiping Time

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

[0036] The 3A glass prepared in Example 1 and Comparative Example 5 was used to test its abrasion resistance using an abrasion testing machine. The test method was to use a 1Kg load and 0000# steel wool, and rub it for 1500 times at a frequency of 60 times / min under a contact area of ​​20mm×20mm. If the water droplet angle reached 100° or above, the test was considered passed; otherwise, the test was considered failed. The results are shown in Table 2. Table 2 Abrasion Resistance

[0037] The results showed that the diluent formulations used in Examples 1-3 had no significant effect on the AF water droplet angle of the 3A glass cover, and therefore had no effect on the abrasion resistance of the glass. After cleaning with AF anti-fingerprint oil, it could still maintain high abrasion resistance and meet the usage requirements.

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

[0039] Comparative Example 8 (1) Cleaning agent cleaning: Use a high-density sponge (density of 45Kg / m³) to apply detergent to the AF surface of the 3A cover glass (AG+AR+AF) and polish it once along the X and Y axes to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.0kgf. (2) Pure water cleaning: Pure water is used for upper and lower spray cleaning at 20℃, the cleaning speed is 2m / min, the spray pressure is 2.0 kg / cm², and the upper spray pressure is ≥ the lower spray pressure; (3) Cutting and drying: Use air knives to blow dry from both the top and bottom, where the air pressure of the upper air knife is greater than or equal to that of the lower air knife, to obtain 3A glass.

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

[0041] Comparative Example 10 (1) Cleaning agent cleaning: Use a high-density sponge (density of 45Kg / m³) to apply detergent to the AF surface of the 3A cover glass (AG+AR+AF) and polish it once along the X and Y axes to remove most of the oil stains in each area of ​​the surface. The wiping pressure is 1.0kgf. (2) Alkaline spraying: Hill GX-18BT alkaline cleaning agent (4% by mass) is used for spraying at 45°C. The cleaning speed is 2m / min, the spraying pressure is 5.0kg / cm², and the upper spraying pressure is ≥ the lower spraying pressure. (3) Cutting and drying: Use air knives to blow dry from both the top and bottom, where the air pressure of the upper air knife is greater than or equal to that of the lower air knife, to obtain 3A glass.

[0042] Results testing: The 3A glass prepared in Example 1 and Comparative Examples 6-10 was subjected to reflectance / transmittance testing. The results are shown in Table 3. Table 3. Influence of cleaning method on cleaning effect and wiping time

[0043] The results showed that wiping with a thinner could quickly remove residual oil stains from the glass surface and significantly improve wiping efficiency (Example 1, Comparative Examples 6-7); using an alkaline cleaning agent was even more effective at removing most oil stains from 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: Includes the following steps: (1) Cleaning with cleaning agent: Clean the glass AF surface with cleaning agent at 1.0-1.5 kgf; (2) Alkaline cleaning: Use an alkaline cleaning agent with a mass percentage of 4-7% to perform roller brush cleaning and spray cleaning on the glass; (3) Water washing: High-pressure spray washing of the glass with water and drying after spray washing; (4) Wiping with thinner: Wipe the glass with thinner to remove stubborn residual oil stains and obtain AF glass; the thinner is composed of 40-60% by mass of ethyl perfluoroisobutyl ether and 40-60% by mass of ethyl perfluorobutyl ether; the wiping time is 2-5s.

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

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

0.

4. The method for cleaning AF anti-fingerprint oil according to claim 1, characterized in that: The cleaning method described in step (1) is to polish the glass surface once along the X-axis and once along the Y-axis.

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

6. The method for cleaning AF anti-fingerprint oil according to claim 1, characterized in that: The spray washing temperature in step (2) is 45±5℃, the pressure is 5±1kg / cm², and the upper spray pressure is greater than or equal to the lower spray pressure.

7. The method for cleaning 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 method for cleaning AF anti-fingerprint oil according to claim 1, characterized in that: The high-pressure spray washing in step (3) has a temperature of 45±5℃ and a pressure of 5±1 kg / cm². 2 The upper spray pressure is greater than or equal to the lower spray pressure; the spray temperature is 25±5℃, and the pressure is 2±0.5kg / cm². 2 The pressure of the upper spray is greater than or equal to the pressure of the lower spray.

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

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