Cell phone cover glass frosting powder and application thereof

Abstract

The present application relates to a kind of mobile phone protective cover plate glass frosting powder and application method, the frosting powder is composed of citric acid, ammonium hydrogen fluoride, barium sulfate, kaolin, feldspar powder, bentonite, sodium hexametaphosphate, sodium gluconate and comb type polyoxyethylene ether copolymer, they are made into frosting liquid with deionized water according to the mass ratio 5:1-1:5, after keeping warm and curing in 50 DEG C constant temperature water bath, inorganic fluoride source and organic acid source in frosting liquid fully react to generate glass frosting active ingredient.The present application also adds comb structure polyoxyethylene ether copolymer in frosting liquid, can be adsorbed in the fixed direction on the surface of inorganic mineral particle, so that its surface has the same charge, produces electrostatic repulsion, mineral particle is dispersed after providing a kind of high fluidity frosting liquid, the above-mentioned frosting liquid is used to carry out frosting processing to glass, the glass frosting after frosting is uniform, and the frosting performance is good, can be widely applied to mobile phone protective glass cover plate frosting processing into anti-dazzle glass.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of processing materials for consumer electronics protection, in particular to a kind of mobile phone protective cover glass frosting powder and application. BACKGROUND

[0002] With the popularization of 5G smart phones, the data information transmitted through the mobile phone is getting larger and larger, and the protection requirements for mobile phone display screen are getting higher and higher. Glass has excellent optical properties, high transmittance and low reflectivity performance, which can clearly display relevant information and does not shield mobile phone data signals, and has developed into the main protective material for mobile phone and other consumer electronic display screen cover. When light is incident on the surface of the glass, it will produce strong specular reflection, which will harm human vision health and affect the ecological environment. Therefore, reducing the specular reflection of glass and converting the specular reflection into diffuse reflection to develop protective glass with anti-glare function is an important development trend of electronic display screen protection materials.

[0003] The processing of anti-glare glass mainly includes physical processing method and chemical processing method. The former includes sanding method, sand blasting method and laser etching method, etc. The latter includes anti-reflection coating method, screen printing method and chemical frosting method, etc. Chemical frosting method refers to the process of modifying and processing the surface of glass by chemical reaction, so that the surface of the glass has uniform light scattering properties. The surface of the glass is roughened, so that the glass loses its luster, and at the same time has excellent anti-glare ability while still being able to transmit light. Chemical frosting has the advantages of simple process, uniform frosting surface, strong controllability, easy operation, and can be processed in large quantities, etc. It is the main method for industrial production of anti-glare glass. The chemical frosting agent for industrial anti-glare glass processing is mainly composed of hydrofluoric acid. Direct use of chemical frosting liquid with hydrofluoric acid as the main frosting active component has strong volatility, corrosion and toxicity, which can cause great harm to the human body. In addition, high concentration of hydrofluoric acid has too fast etching speed on glass, which can easily cause uneven frosting on the surface of the glass.

[0004] The chemical frosting powder disclosed in CN202010840034.7, CN202011521269.6, CN202010203992.3, etc. is a solid frosting powder made of soluble fluorinated salt such as ammonium fluoride and ammonium fluoride as fluorine source, soluble organic acid such as citric acid as acid source, and other auxiliary etching additives. It can adjust the etching speed of the glass surface and improve the etching effect of the glass. The chemical frosting powder is a high solid content suspension when used, and a large amount of insoluble solid is mainly composed of inorganic minerals such as kaolin, diatomite, talc, feldspar and bentonite, and inorganic salt regulators. The high solid content inorganic minerals are not easy to disperse in the suspension, resulting in poor flowability of the suspension, uneven frosting of the glass, and easy occurrence of defects such as sand leakage and bright lines. The chemical frosting liquid has poor adaptability and cannot meet the application requirements of glass chemical frosting.

[0005] Based on the above analysis, it is necessary to study a solid frosting liquid formula with high fluidity to improve the uniformity of glass frosting and meet the production requirements of mobile phone cover protective glass, while ensuring the environmental protection and safety of the frosting liquid formula. SUMMARY

[0006] In view of the above shortcomings, the purpose of the present application is to provide a high-fluidity frosting liquid and a frosting process applied to mobile phone cover protective glass. The frosting liquid components are mixed and matured in an aqueous solution, and then the fluoride source in the soluble fluoride salt and the acid source of soluble organic acid react in the aqueous solution to generate frosting active ingredients. The speed of chemical frosting can be reduced and adjusted. By adding a comb-type polyoxyethylene ether copolymer to the frosting powder formula, the fluidity of the frosting liquid is improved, the chemical frosting of the glass is more uniform, and the frosting quality of the glass surface is improved.

[0007] The present application is realized by the following technical means:

[0008] A mobile phone protective cover glass frosting powder, comprising:

[0009] Fluoride source: 80-150 parts;

[0010] Acid source: 80-150 parts;

[0011] Barium sulfate: 2-10 parts;

[0012] Feldspar powder: 5-25 parts;

[0013] Kaolin: 2-10 parts;

[0014] Bentonite: 0.5-5 parts;

[0015] Sodium hexametaphosphate: 1-5 parts;

[0016] Sodium gluconate: 0.5-5 parts; and

[0017] Comb-type polyoxyethylene ether;

[0018] The additive amount of the comb-type polyoxyethylene ether is 0.1-6% of the total weight of the remaining solid materials.

[0019] Further, the fluoride source includes but is not limited to any one or several of ammonium hydrogen fluoride, sodium hydrogen fluoride, and potassium hydrogen fluoride.

[0020] Further, the fluoride source is 130 parts.

[0021] Further, the acid source includes but is not limited to any one or several of citric acid, oxalic acid, and maleic acid.

[0022] Further, the acid source is 85 parts.

[0023] Further, the comb-shaped polyoxyethylene ether structure is as follows:

[0024]

[0025] In the formula: x = 5-50; R is H or alkyl; M1 is H or alkyl; n = 20-200.

[0026] Further, the x = 30-40; n = 50-100.

[0027] Further, the additive amount of the comb-shaped polyoxyethylene ether accounts for 0.6% of the total weight of the remaining solid materials.

[0028] Further, the application further discloses an application of the frosted powder for mobile phone cover glass in frosted treatment of mobile phone cover glass, which comprises the following steps:

[0029] (1) mixing the frosted powder with deionized water and heating and curing the mixture to obtain a cured frosted liquid for standby;

[0030] (2) treating a to-be-frosted glass in an ethanol / acetone mixed solution by ultrasonic treatment, then placing the glass in a dilute sulfuric acid solution for acid washing treatment, and then cleaning the glass with deionized water until the glass is neutral, so as to obtain a pretreated glass wafer;

[0031] (3) sticking a protective film on the side of the pretreated glass wafer which does not need to be frosted, and preheating the glass wafer so that the temperature of the glass surface is consistent with the frosted temperature;

[0032] (4) cooling the cured frosted liquid to the frosted temperature, and frosted reacting the glass surface;

[0033] (5) cleaning and drying the frosted glass, and then tearing off the protective film to obtain an anti-dazzle glass.

[0034] Further, the mass ratio of the frosted powder to the deionized water in step (1) is 5:1-1:5; the curing temperature is 50 DEG C, and the curing time is 36 hours.

[0035] Further, the preparation ratio of the frosted powder to the deionized water is 2.5:1.

[0036] Further, the ethanol / acetone mixed liquid in step (2) is prepared by mixing ethanol and acetone in equal volume; and the ultrasonic treatment time is 15 min.

[0037] Further, the frosted temperature in step (4) is 20 DEG C-60 DEG C; and the frosted time is 1-30 min. Preferably, the frosted temperature is 30 DEG C-40 DEG C.

[0038] Furthermore, the frosting temperature is 30–40°C; the frosting time is 5–10 minutes.

[0039] The active ingredient of the frosting described in this invention can be generated by the following reaction between a fluorine source and an acid source in solution:

[0040]

[0041]

[0042]

[0043]

[0044]

[0045] The beneficial effects of this invention are as follows:

[0046] The frosting solution of this invention uses a relatively safe soluble fluoride salt and a solid organic acid compound to react and provide the frosting active ingredient, avoiding the direct use of hydrofluoric acid and reducing the frosting speed of the glass. By adding a polyoxyethylene copolymer dispersant, the viscosity of the frosting solution is reduced while maintaining the frosting active ingredient, and the fluidity of the chemical frosting solution is improved. The resulting frosting solution has good stability, making the reaction between the frosting solution and the glass surface more uniform and achieving a better frosting effect.

[0047] The anti-glare glass produced by frosting glass with the frosting liquid described in this invention has a smooth glass surface, no light leakage or sand leakage, and a good frosted feel.

[0048] The anti-glare glass produced by frosting glass with the frosting liquid described in this invention has uniform roughness, low gloss and suitable haze value. The frosting process is simple and controllable, suitable for batch processing, and can effectively improve the production efficiency of glass chemical frosting process. Attached Figure Description

[0049] Figure 1 This is a scanning electron microscope image of the glass substrate before etching according to the present invention;

[0050] Figure 2 and Figure 3 These are scanning electron microscope (SEM) and atomic force microscope (AFM) images of the etched glass substrate according to an embodiment of the present invention. Detailed Implementation

[0051] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0052] Preparation of the sandblasting liquid:

[0053] Ammonium hydrogen fluoride: 80-150 parts; citric acid 80-150 parts; barium sulfate: 2-10 parts; feldspar powder: 5-25 parts; kaolin: 2-10 parts; bentonite: 0.5-5 parts; sodium hexametaphosphate: 1-5 parts; sodium gluconate: 0.5-5 parts; comb-type polyoxyethylene ether: copolymer 0.1-6 parts.

[0054] The sandblasting powder is mixed with deionized water in a weight ratio of 5:1-1:5;

[0055] The raw materials in the above-mentioned sandblasting powder are weighed, and deionized water is added in a ratio of 5:1-1:5. After sealing, it is placed in a 50℃ device for 36 hours of stirring and curing. After the sandblasting liquid is taken out and cooled to room temperature, it is ready for use.

[0056] Glass sandblasting method:

[0057] Glass surface cleaning treatment: the glass original piece is placed in a prepared ethanol / acetone mixed solution with equal volume, and ultrasonic treatment is carried out for 15 min;

[0058] Acid treatment: the glass original piece treated by the above-mentioned step is placed in a prepared dilute sulfuric acid solution with a volume fraction of 2% for 2 min, then taken out, and cleaned with clean water before use;

[0059] Paste protective film: the sandblasting process of the present application is single-sided glass chemical sandblasting, and the protective film is pasted to protect the glass surface which does not need to be sandblasted, so as to expose the surface which needs to be sandblasted;

[0060] Preheating treatment: the glass original piece treated by the above-mentioned step is placed in an oven for preheating, so as to keep the temperature of the glass surface consistent with the temperature during sandblasting, and improve the efficiency of glass sandblasting;

[0061] Glass chemical sandblasting: the sandblasting liquid after curing is cooled to the sandblasting treatment temperature, and is placed in the sandblasting device built in advance, the temperature in the device is adjusted to 30-40℃, then the glass original piece treated by the above-mentioned step is also placed in the device and immersed in the sandblasting liquid, so that the sandblasting chemical reaction occurs, after the sandblasting is completed, the sandblasting anti-dazzle glass can be obtained after cleaning and drying with deionized water.

[0062] Frosting performance evaluation:

[0063] (1) The surface roughness of the anti-glare glass was detected by SJ-210 surface roughness tester;

[0064] (2) The haze of the anti-glare glass was detected by TH-100 haze meter;

[0065] (3) The gloss of the anti-glare glass was detected by WG60 gloss meter;

[0066] (4) The surface morphology of the anti-glare glass was observed by MIRA 3LMH scanning electron microscope;

[0067] (5) The surface morphology of the anti-glare glass was observed by Bruker Icon atomic force microscope;

[0068] (6) The uniformity of the frosting effect of the frosted glass was observed by naked eye.

[0069] Example 1:

[0070] Ammonium bifluoride 130 parts, citric acid 85 parts, barium sulfate 6 parts, feldspar powder 15 parts, kaolin 5 parts, bentonite 1 part, sodium hexametaphosphate 5 parts, sodium gluconate 3 parts, polyoxyethylene ether copolymer 0.6 parts (based on the total weight of the frosting powder) were mixed with deionized water 100 parts, and the frosting powder was mixed with the above-mentioned frosting powder, and then aged at 50°C for 36 hours. The cleaned glass sheet was immersed in the aged frosting solution and treated at 30°C for 6 min.

[0071] The frosting solution was prepared according to the method described in the frosting process technical route, the anti-glare glass was prepared, and the performance of the anti-glare glass was evaluated. The viscosity of the frosting solution was 34.25 mPas, the glass roughness after frosting was 254 nm, the haze was 82.9%, the gloss was 11.1 Gu, and the surface was observed by naked eye without sand leakage and bright strip. The scanning electron microscope image of the glass after frosting is as follows Figure 2 ( Figure 1 The scanning electron microscope image of the glass sheet before frosting), and the atomic force microscope image is as follows Figure 3 It was found that etch pits appeared on the surface of the glass, which increased the height difference of the glass surface, thereby significantly increasing the surface roughness, and providing the most basic topographic features for the formation of the anti-glare effect of the cover glass.

[0072] Example 2:

[0073] The other components of the sanding powder, the curing conditions and the sanding process remain unchanged, and the addition amount of the polyoxyethylene ether copolymer dispersant is changed to 0.2% of the total mass of the sanding powder. The viscosity of the sanding liquid is 46.33 mPas, the glass roughness after sanding is 326 nm, the haze is 66.8%, the gloss is 14.1 Gu, and no sand leakage and bright lines are observed on the surface under naked eye observation.

[0074] Example 3:

[0075] The other components of the sanding powder, the curing conditions and the sanding process remain unchanged, and the addition amount of the polyoxyethylene ether copolymer dispersant is changed to 0.8% of the total mass of the sanding powder. The viscosity of the sanding liquid is 40.36 mPas, the glass roughness after sanding is 273 nm, the haze is 75.6%, the gloss is 13.1 Gu, and no sand leakage and bright lines are observed on the surface under naked eye observation.

[0076] Example 4:

[0077] The other components of the sanding powder, the curing conditions and the sanding process remain unchanged, and the addition amount of the polyoxyethylene ether copolymer dispersant is changed to 1% of the total mass of the sanding powder. The viscosity of the sanding liquid is 45.27 mPas, the glass roughness after sanding is 298 nm, the haze is 70.1%, the gloss is 13.7 Gu, and sand leakage is observed on the surface under naked eye observation.

[0078] Example 5:

[0079] The other components of the sanding powder, the curing conditions and the sanding process remain unchanged, and no polyoxyethylene ether copolymer dispersant is added, serving as a blank control example. The viscosity of the sanding liquid is 79.60 mPas, the glass roughness after sanding is 379 nm, the haze is 64.8%, the gloss is 18.9 Gu, and sand leakage and bright lines are observed on the surface under naked eye observation.

[0080] Comparative Example 1

[0081] The components of the sanding powder and the curing conditions are the same as those in Example 1, and the sanding time of the glass original piece immersed in the sanding liquid is 3 min. The viscosity of the sanding liquid is 34.25 mPas, the glass roughness after sanding is 348 nm, the haze is 58.0%, the gloss is 19.1 Gu, and sand leakage is observed on the surface under naked eye observation.

[0082] Comparative Example 2

[0083] The components of the sanding powder and the curing conditions are the same as those in Example 1, and the sanding time of the glass original piece immersed in the sanding liquid is 9 min. The viscosity of the sanding liquid is 34.25 mPas, the glass roughness after sanding is 209 nm, the haze is 68.3%, the gloss is 11.7 Gu, and no sand leakage and bright lines are observed on the surface under naked eye observation.

[0084] Comparative Example 3

[0085] The frit composition and the aging condition are the same as those of Example 1, and the frit is immersed in the frit liquid for 15 minutes. The viscosity of the frit liquid is 34.25 mPas, the roughness of the glass after fritting is 245 nm, the haze is 68.2%, the gloss is 12.5 Gu, and the surface is observed to have bright lines.

[0086] Comparative Example 4

[0087] The frit composition, the aging condition, and the fritting process are the same as those of Example 1, and the amount of water added to the frit liquid is 200 parts, i.e., frit: water = 1.25: 1. The viscosity of the frit liquid is 26.76 mPas, the roughness of the glass after fritting is 171 nm, the haze is 60.3%, the gloss is 19.1 Gu, and the surface is observed to have no frit leakage and bright lines.

[0088] Comparative Example 5

[0089] The frit composition, the aging condition, and the fritting process are the same as those of Example 1, and the amount of water added to the frit liquid is 312.5 parts, i.e., frit: water = 1: 1.25. The viscosity of the frit liquid is 19.81 mPas, the roughness of the glass after fritting is 98 nm, the haze is 35.4%, the gloss is 46.9 Gu, and the surface is observed to have severe frit leakage.

[0090] Comparative Example 6

[0091] Ammonium bifluoride 120 parts, citric acid 95 parts, barium sulfate 6 parts, feldspar powder 15 parts, kaolin 5 parts, bentonite 1 part, sodium hexametaphosphate 5 parts, sodium gluconate 3 parts, and polyoxyethylene ether copolymer 0.6 parts (based on the total weight of the frit) are mixed, deionized water 100 parts is added, and the above frit is stirred and mixed. The mixture is aged at 50°C for 36 hours. The cleaned glass original piece is immersed in the aged frit liquid, and fritting is performed at 30°C for 6 minutes. The viscosity of the frit liquid is 34.71 mPas, the roughness of the glass after fritting is 232 nm, the haze is 73.6%, the gloss is 16.5 Gu, and the surface is observed to have no frit leakage and bright lines.

[0092] Comparative Example 7

[0093] Ammonium bifluoride 107.5 parts, citric acid 107.5 parts, barium sulfate 6 parts, feldspar powder 15 parts, kaolin 5 parts, bentonite 1 part, sodium hexametaphosphate 5 parts, sodium gluconate 3 parts, and polyoxyethylene ether copolymer 0.6 parts (based on the total weight of the frit) are mixed, deionized water 100 parts is added, and the above frit is stirred and mixed. The mixture is aged at 50°C for 36 hours. The cleaned glass original piece is immersed in the aged frit liquid, and fritting is performed at 30°C for 6 minutes. The viscosity of the frit liquid is 34.52 mPas, the roughness of the glass after fritting is 161 nm, the haze is 85.1%, the gloss is 19.3 Gu, and the surface is observed to have no frit leakage and bright lines.

[0094] Comparative Example 8

[0095] Ammonium hydrogen fluoride 95 parts, citric acid 120 parts, barium sulfate 6 parts, feldspar powder 15 parts, kaolin 5 parts, bentonite 1 part, sodium hexametaphosphate 5 parts, sodium gluconate 3 parts, polyoxyethylene ether copolymer 0.6 parts (based on the total weight of the sanding powder) were mixed and then added to 100 parts of deionized water, and the sanding powder was stirred and mixed. The mixture was aged at 50°C for 36 hours. The cleaned glass substrate was immersed in the aged sanding solution and sanded at 30°C for 6 minutes. The viscosity of the sanding solution was 35.70 mPas, the surface roughness of the sanded glass was 132 nm, the haze was 88.3%, the gloss was 31.7 Gu, and the surface was observed to have severe sanding defects.

[0096] Comparative Example 9

[0097] Ammonium hydrogen fluoride 85 parts, citric acid 130 parts, barium sulfate 6 parts, feldspar powder 15 parts, kaolin 5 parts, bentonite 1 part, sodium hexametaphosphate 5 parts, sodium gluconate 3 parts, polyoxyethylene ether copolymer 0.6 parts (based on the total weight of the sanding powder) were mixed and then added to 100 parts of deionized water, and the sanding powder was stirred and mixed. The mixture was aged at 50°C for 36 hours. The cleaned glass substrate was immersed in the aged sanding solution and sanded at 30°C for 6 minutes. The viscosity of the sanding solution was 35.34 mPas, the surface roughness of the sanded glass was 115 nm, the haze was 89.2%, the gloss was 46.9 Gu, and the surface was observed to have severe sanding defects.

[0098] As can be seen from the performance of the anti-glare glass prepared, in terms of surface roughness, haze, gloss, and surface uniformity, the sanding effect of the sanding solution after adding the polyoxyethylene ether copolymer is superior to the sanding effect without adding the polyoxyethylene ether copolymer.

[0099] Table 1 Summary of sanding results for examples and comparative examples

[0100] Test No. Viscosity / mPas Roughness / nm Haze / % Gloss / Gu Uniformity of sanding Example 1 34.25 254 82.9 11.1 No sand leakage, no bright lines Example 2 46.33 326 66.8 14.3 No sand leakage, no bright lines Example 3 40.36 273 75.6 13.1 No sand leakage, no bright lines Example 4 45.27 298 70.1 13.7 Sand leakage Example 5 79.60 379 64.8 18.9 Sand leakage, bright lines Comparative Example 1 34.25 348 58.0 19.1 Sand leakage Comparative Example 2 34.25 209 68.3 11.7 No sand leakage, no bright lines Comparative Example 3 34.25 245 68.2 12.5 Bright lines Comparative Example 4 26.76 171 60.3 19.6 No sand leakage, no bright lines Comparative Example 5 19.81 98 35.4 46.9 Severe sand leakage Comparative Example 6 34.71 232 73.6 16.5 No sand leakage, no bright lines Comparative Example 7 34.52 161 85.1 19.3 No sand leakage, no bright lines Comparative Example 8 35.20 132 88.3 31.7 Severe sand leakage Comparative Example 9 35.34 115 89.2 46.9 Severe sand leakage

[0101] The above description is only a preferred embodiment of the present application and does not limit the present application in any form. Any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application. Therefore, any simple modification, equivalent replacement, equivalent change, and modification made to the above examples based on the technical essence of the present application, without departing from the scope of the technical solutions of the present application, are still within the scope of protection of the technical solutions of the present application.

Claims

1.A mobile phone cover glass frosting powder for use in a mobile phone cover glass frosting process, comprising: (1) mixing the mobile phone cover glass frosting powder with deionized water, the mass ratio of the frosting powder to the deionized water being 5-1.25:1, and heating and curing the mixture to obtain a cured frosting solution for standby; (2) subjecting the glass to be frosted to ultrasonic treatment in a mixed solution of ethanol / acetone, then subjecting the glass to acid washing treatment in a dilute sulfuric acid solution, and then washing the glass with deionized water until the glass is neutral, to obtain a pretreated glass sheet; (3) pasting a protective film on the side of the pretreated glass sheet that does not need to be frosted, and preheating the glass sheet to keep the temperature of the glass surface consistent with the frosting temperature; (4) cooling the cured frosting solution to the frosting temperature, and subjecting the glass surface to frosting reaction; (5) washing and drying the frosted glass, and then tearing off the protective film to obtain an anti-glare glass; wherein: the mobile phone cover glass frosting powder of step (1) comprises the following raw materials in the following mass proportions: a fluorine source: 80-150 parts; an acid source: 80-150 parts; barium sulfate: 2-10 parts; feldspar powder: 5-25 parts; kaolin: 2-10 parts; bentonite: 0.5-5 parts; sodium hexametaphosphate: 1-5 parts; sodium gluconate: 0.5-5 parts; and a comb-type polyoxyethylene ether; the additive amount of the comb-type polyoxyethylene ether accounts for 0.1-6% of the total weight of the remaining solid materials; the fluorine source includes any one or more of ammonium hydrogen fluoride, sodium hydrogen fluoride, and potassium hydrogen fluoride; the acid source is an organic acid; the comb-type polyoxyethylene ether has the following structure: ; wherein: x=5-50； R is H or an alkyl group; M1 is H or an alkyl group. n=20-200。 2.The use according to claim 1, wherein: the curing temperature of step (1) is 50℃, and the curing time is 36 hours. 3.The use according to claim 1, wherein: the ethanol / acetone mixed solution of step (2) is prepared by mixing ethanol and acetone in equal volumes; the ultrasonic treatment time is 15 min. 4.The use according to claim 1, wherein: the frosting temperature of step (4) is 20-60℃; the frosting time is 1-30 min. 5.The use according to claim 4, wherein: the frosting temperature is 30-40℃; the frosting time is 5-10 min. 6.The use according to claim 1, wherein: the fluorine source is 130 parts. 7.The use according to claim 1, wherein: the organic acid is selected from any one or more of citric acid, oxalic acid, and maleic acid; the acid source is 85 parts. 8.The use according to claim 1, wherein: the additive amount of the comb-type polyoxyethylene ether accounts for 0.6% of the total weight of the remaining solid materials.

Images