A glass resistant to attack and process for its preparation

Abstract

The application relates to the field of glass, in particular to an anti-impact glass and a preparation process thereof. The anti-impact glass is prepared by using ceramic micro-powder with a crystal structure in raw materials, the ceramic micro-powder with the crystal structure is evenly distributed in the non-crystal structure of the anti-impact glass, and the ceramic micro-powder is used in combination with alumina and zirconia with good toughening effect in the raw materials of the anti-impact glass, so that the synergistic performance between the crystal structure of the ceramic micro-powder and the non-crystal structure in the anti-impact glass is improved, and then the ceramic micro-powder can better absorb impact energy and reduce crack propagation under the action of impact force on the anti-impact glass, and the anti-impact performance of the anti-impact glass is improved.

Description

Technical Field

[0001] This application relates to the field of glass, and in particular to an impact-resistant glass and its preparation process. Background Technology

[0002] Glass is an important material with a wide range of applications, from construction and automobiles to flat panel displays, wearable consumer electronics, and optical instruments.

[0003] Glass, also known as amorphous glass, usually refers to a solid obtained by rapid cooling. Its structure is inherently different from that of ceramic crystals, which have a three-dimensional long-range ordered structure. Glass is composed of ionic and covalent bonds, making it brittle and less resistant to impact. It is easily broken during use, which limits the lifespan and application scenarios of conventional glass. Summary of the Invention

[0004] To address the problem of poor impact resistance of existing general glass, this application provides an impact-resistant glass and its preparation process.

[0005] Firstly, this application provides an impact-resistant glass.

[0006] An impact-resistant glass, by weight, comprises the following raw materials: 80-100 parts silicon dioxide, 15-20 parts aluminum oxide, 1-2 parts zirconium oxide, 3-6 parts calcium oxide, 1-5 parts sodium oxide, 2-6 parts boron oxide, and 5-10 parts ceramic micro powder.

[0007] By adopting the above technical solution, ceramic micropowder with a crystalline structure is used in the raw materials of impact-resistant glass. The ceramic micropowder with a crystalline structure is more uniformly distributed in the amorphous structure of the impact-resistant glass. Furthermore, the ceramic micropowder is used in combination with alumina and zirconium oxide, which have good toughening effects, in the raw materials of impact-resistant glass. This enhances the interaction force and synergistic performance between the crystalline structure of the ceramic micropowder and the amorphous structure in the impact-resistant glass. As a result, when the impact-resistant glass is subjected to impact force, the ceramic micropowder can better absorb impact energy and reduce crack propagation, thereby improving the impact resistance of the impact-resistant glass.

[0008] Preferably, the average particle size of the ceramic micropowder is below 35 μm.

[0009] By adopting the above technical solution, when the particle size of ceramic micro powder is too large, it will cause internal defects in the impact glass, such as stress concentration, which will reduce the impact performance of the impact glass.

[0010] Preferably, the raw materials for the impact-resistant glass also include 3-6 parts of magnesium oxide and 0.5-1.5 parts by weight of potassium oxide.

[0011] By adopting the above technical solutions, magnesium oxide is used to improve the heat resistance, chemical stability and mechanical strength of impact-resistant glass; potassium oxide can improve the glass processing performance. By using magnesium oxide and potassium oxide in the raw materials of impact-resistant glass, the overall performance of impact-resistant glass is improved.

[0012] Preferably, the raw materials for the ceramic micropowder to resist glass also include 2-3 parts by weight of carbon.

[0013] By adopting the above technical solution, carbon can promote the uniform dispersion of various raw materials in impact glass, enhance the hardness of glass and improve its UV resistance, thereby improving the impact resistance and stability of impact glass.

[0014] On the other hand, this application provides a process for preparing glass that resists impact.

[0015] A process for preparing impact-resistant glass includes the following preparation steps:

[0016] Preparation of the premix: Alumina, silicon dioxide, calcium oxide, zirconium oxide, sodium oxide, boron oxide and ceramic micro powder are ground separately and then stirred evenly to form a premix;

[0017] Preparation of glass preforms: The premix is ​​heated to the melting temperature of 1600-1700℃, stirred to form molten glass, the molten glass is poured into a mold, cooled, demolded, and the glass preform is obtained.

[0018] Tempering treatment: The glass blank is placed in molten salt for tempering treatment, followed by cooling and cleaning to prepare impact glass;

[0019] The raw materials for the molten salt, by mass, include 0.5-1.5 parts potassium hydroxide, 0.5-1.0 parts calcium hydroxide, 0.2-0.5 parts aluminum oxide, 0.5-2 parts phosphoric acid, 0.2-1.5 parts potassium phosphate, and 85-95 parts potassium nitrate.

[0020] By adopting the above technical solution, the prepared glass blank is tempered to form compressive stress on the glass surface. When the glass is subjected to external force, the surface stress is first offset, thereby improving the load-bearing capacity and enhancing the impact resistance of the glass.

[0021] The use of phosphoric acid, calcium hydroxide, and potassium hydroxide in molten salt can generate hydroxyphosphates under high temperature. Hydroxyphosphates are deposited in the microcracks generated in the glass during the tempering process under high temperature, which helps to reduce the expansion of microcracks and / or eliminate microcracks, thereby improving the impact resistance of the glass.

[0022] Preferably, the raw materials for the molten salt further include 0.5-1.5 parts by weight of silica.

[0023] By adopting the above technical solution, silicic acid is used in combination with phosphoric acid, calcium hydroxide and potassium hydroxide in molten salt. Silicic acid can react with calcium hydroxide and / or potassium hydroxide to generate silicates. Silicates and hydroxyphosphates work synergistically to reduce the expansion of microcracks caused by high temperature during tempering and / or eliminate microcracks, thereby further improving the impact resistance of the glass.

[0024] Preferably, the tempering treatment temperature is 400℃-550℃, and the tempering treatment time is 2-8h; the cooling step involves immersing in water at 40-60℃ for 2-5h.

[0025] By adopting the above technical solutions and optimizing the tempering process conditions, the impact resistance of glass can be further improved.

[0026] Preferably, the preparation process of the impact-resistant glass further includes surface film treatment; the surface film treatment process is as follows:

[0027] The tempered glass blank is preheated to a spraying temperature of 30-45℃, and the spraying liquid is sprayed onto the surfaces of both sides of the preheated tempered glass blank. Then, it is cured at 100-120℃ to form a film layer.

[0028] The raw materials of the spraying liquid, by weight, include 10-20 parts of methyl MQ silicone resin, 10-20 parts of divinyl silicone oil, 3-10 parts of glycidyl acrylate, 3-8 parts of butyl acrylate, 3-8 parts of methyl methacrylate, 0.5-1.5 parts of castor oil, 15-20 parts of xylene, 0.001-0.01 parts of dibutyltin dibutylsilicate, and 0.001-0.01 parts of azobisisobutyronitrile.

[0029] By adopting the above technical solutions, the impact resistance of the formed film is improved by using methyl silicone resin and divinyl silicone oil with good flexibility, and the density, mechanical properties and adhesion to the glass surface of the film formed by the spray liquid are improved by using glycidyl acrylate, butyl acrylate and methyl methacrylate, thereby making the prepared impact glass have excellent corrosion resistance and stability. Castor oil with multifunctional groups can improve the crosslinking degree of the formed film, further improving the impact resistance, strength, corrosion resistance and stability of the film formed by the spray liquid, and further improving the impact resistance and stability of the impact glass.

[0030] Preferably, the raw materials of the spraying liquid further include 1-5 parts by weight of fluorinated acrylate, wherein the fluorinated acrylate is at least one of perfluorooctyl acrylate, hexafluorobutyl methacrylate, and perfluorodecyl acrylate.

[0031] By adopting the above technical solution, fluorinated acrylate is combined with methyl silicone resin and divinyl silicone in the spraying liquid to further reduce the surface energy of the film layer, improve the waterproof, self-cleaning, acid and alkali resistance of the film layer, and thus improve the stability of the film layer.

[0032] Preferably, the thickness of the film layer is 6-9 μm.

[0033] By adopting the above technical solution and optimizing the thickness of the film layer, the coating liquid forms a film layer that provides better protection against impacts on the glass, thereby improving the stability and impact resistance of the glass.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. An impact-resistant glass, wherein the ceramic micropowder with a crystalline structure is used in its raw materials, and the ceramic micropowder with a crystalline structure is evenly distributed in the amorphous structure of the impact-resistant glass. Furthermore, the ceramic micropowder is used in combination with alumina and zirconium oxide, which have good toughening effects, in the raw materials of the impact-resistant glass to improve the synergistic performance between the crystalline structure of the ceramic micropowder and the amorphous structure in the impact-resistant glass. As a result, when the impact-resistant glass is subjected to impact force, the ceramic micropowder can better absorb impact energy and reduce crack propagation, thereby improving the impact resistance of the impact-resistant glass.

[0036] 2. Furthermore, in the molten salt tempering process of impact-resistant glass, phosphoric acid, silicate, calcium hydroxide, and potassium hydroxide are used in combination in the molten salt. Phosphoric acid and silicate can react with calcium hydroxide and / or potassium hydroxide to generate hydroxyphosphate and silicate. The hydroxyphosphate and silicate are deposited in the microcracks of the glass blank caused by high temperature during the tempering process. The hydroxyphosphate and silicate work together to reduce the expansion of microcracks caused by high temperature during the tempering process of impact-resistant glass and / or eliminate microcracks, thereby further improving the impact resistance of impact-resistant glass.

[0037] 3. Furthermore, a film layer is applied to both sides of the surface of the tempered glass blank. The methyl silicone resin and divinyl silicone oil in the film layer, which have good flexibility, enhance the impact resistance of the film layer. The glycidyl acrylate, fluorinated acrylate, butyl acrylate, castor oil and methyl methacrylate in the film layer are compatible, which improves the density, acid and alkali resistance and adhesion of the film layer formed by the spray liquid on the tempered glass blank. This results in a good synergistic effect between the film layer and the tempered glass blank, further improving the impact resistance and stability against glass. Detailed Implementation

[0038] raw material

[0039] Ceramic micro powder (main components are SiO2 and Al2O3, moisture content 0.2%, oil absorption rate: 50%), methyl MQ silicone resin (solid, M:Q value 0.6:1), vinyl silicone oil (viscosity 5000 mPa·s, vinyl content 0.45 mmol / g), castor oil (acid value mg / g: 198-206, iodine value gI2 / 100g: 120-145, saponification value mg KOH / 100g: 195-207), alumina powder (average particle size: 300 nm), silicon dioxide (specific surface area 300 m2 / g, loss on heating 1.5%), calcium oxide (density 2.93 g / cm3), zirconium oxide (industrial grade, content 99.99%, average particle size: 100 nm), carbon (grade N550).

[0040] Preparation example of intermediate

[0041] Preparation Example 1: A spraying liquid, using raw materials as shown in Table 1, and its preparation process is as follows:

[0042] Xylene was heated to 40°C, methyl MQ silicone resin was added, and the mixture was stirred at 100 r / min for 1 h. Then, divinyl silicone oil, glycidyl acrylate, castor oil, butyl acrylate, methyl methacrylate, castor oil, fluorinated acrylate (using perfluorooctyl acrylate), dibutyltin disilicate, and azobisisobutyronitrile were added, and the mixture was stirred for another 1.5 h to prepare the spraying liquid.

[0043] Preparation Example 2, a spraying liquid, differs from Preparation Example 1 in the weight of the raw materials used, the type of fluorinated acrylate, and the setting of the preparation process parameters. The raw materials used are shown in Table 1, and the preparation process is as follows:

[0044] Xylene was heated to 35°C, methyl MQ silicone resin was added, and the mixture was stirred at 200 r / min for 0.5 h. Then, divinyl silicone oil, glycidyl acrylate, castor oil, butyl acrylate, methyl methacrylate, castor oil, fluorinated acrylate (using hexafluorobutyl methacrylate), dibutyltin disilicate, and azobisisobutyronitrile were added, and the mixture was stirred for another 1 h to prepare the spraying liquid.

[0045] Preparation Example 3, a spraying liquid, differs from Preparation Example 1 in the weight of the raw materials used, the type of fluorinated acrylate, and the setting of the preparation process parameters. The raw materials used are shown in Table 1, and the preparation process is as follows:

[0046] Xylene was heated to 45°C, methyl MQ silicone resin was added, and the mixture was stirred at 150 r / min for 1 h. Then, divinyl silicone oil, glycidyl acrylate, castor oil, butyl acrylate, methyl methacrylate, castor oil, fluorinated acrylate (using a composition of perfluorooctyl acrylate and hexafluorobutyl acrylate in a mass ratio of 1:1), dibutyltin disilicate, and azobisisobutyronitrile were added, and the mixture was stirred for another 2.0 h to prepare the spraying liquid.

[0047] Table 1. List of raw material weights and types of fluorinated acrylates used in the wire spraying solutions of Examples 1-3

[0048]

[0049]

[0050] Preparation Example 4, a spraying liquid, differs from Preparation Example 1 in that it does not use glycidyl acrylate.

[0051] Preparation Example 5, a spraying liquid, differs from Preparation Example 1 in that castor oil is replaced in an equal amount with γ-aminopropyltriethoxysilane, and glycidyl acrylate is not used.

[0052] Preparation Example 6, a spraying liquid, differs from Preparation Example 1 in that it does not use perfluorooctyl acrylate.

[0053] Preparation Example 7, a spraying liquid, differs from Preparation Example 1 in that γ-mercaptopropyltrimethoxysilane is used to replace butyl acrylate in an equal amount; methyl methacrylate, perfluorooctyl acrylate, glycidyl acrylate and castor oil are not used.

[0054] Example

[0055] Example 1: An impact-resistant glass, using raw materials as shown in Table 2, and its preparation process includes the following steps:

[0056] Preparation of the premix: In a grinding mill, silicon dioxide, aluminum oxide, calcium oxide, zirconium oxide, sodium oxide, boron oxide, ceramic micro powder, potassium oxide, magnesium oxide and carbon were ground separately until the particle size was 60±20nm. Then they were added to a stirring vessel and stirred for 5±3min at a stirring speed of 80±20r / min to form a uniform premix.

[0057] Preparation of glass preform: Then reduce the rotation speed to 40±10 r / min, continuously heat the premix to the melting temperature of 1650℃, increase the rotation speed to 45±10 r / min, stir for 10 min to form glass liquid; pour the glass liquid into the mold, and then place the mold with the glass liquid in the constant temperature oven to cool slowly at a rate of 1℃ / min. After cooling to room temperature, demold to obtain a glass preform with a thickness of 4 mm.

[0058] Tempering treatment: The glass blank is placed in molten salt at 450°C (the raw materials used for the molten salt are shown in Table 3) for tempering treatment for 6 hours, then cooled by immersion in water at 40°C for 4 hours, and then cleaned with clean water.

[0059] Surface film treatment: The tempered glass blank is preheated to the spraying temperature of 35°C. The spraying liquid (using Preparation Example 1) is sprayed onto one side of the preheated and tempered glass blank using a spray gun. Then, the first curing is performed at a temperature of 120°C for 1 hour. After cooling to the spraying temperature, the spraying liquid (using Preparation Example 1) is sprayed onto the other side of the glass blank using a spray gun. Then, the second curing is performed at a temperature of 120°C for 1 hour to obtain impact glass.

[0060] Examples 2 and 3 are impact-resistant glass, which differ from Example 1 in that the weight of the raw materials, the type of molten salt, and the setting of the preparation process parameters are different, as shown in Tables 2-3.

[0061] Table 2. List of raw material weights and preparation process parameters used in the impact-resistant glass of Examples 1-3

[0062]

[0063]

[0064] Table 3. List of raw material types and weights of molten salt used in the preparation process of impact-resistant glass in Examples 1-3.

[0065]

[0066] Examples 4-7 are anti-glass coatings, which differ from Example 1 in that the coating liquid used in Examples 4 to 7 are used sequentially.

[0067] Example 8, an impact-resistant glass, differs from Example 1 in that the average particle size of the ceramic micro powder is 40 μm; 15 kg of alumina and 1 kg of zirconium oxide are used.

[0068] Example 9, an impact-resistant glass, differs from Example 1 in that magnesium oxide and potassium oxide are not used in the raw materials of the impact-resistant glass.

[0069] Example 10, an impact-resistant glass, differs from Example 1 in that carbon, magnesium oxide, and potassium oxide are not used in the raw materials of the impact-resistant glass.

[0070] Example 11, an anti-glass, differs from Example 1 in that the raw materials of the molten salt do not use silica.

[0071] Example 12, an anti-glass, differs from Example 1 in that phosphoric acid is not used in the raw materials of the molten salt.

[0072] Example 13, an anti-glass, differs from Example 1 in that phosphoric acid and silica are not used in the raw materials of the molten salt.

[0073] Example 14, an impact-resistant glass, differs from Example 1 in that it does not undergo surface film treatment.

[0074] Example 15, an impact-resistant glass, differs from Example 1 in that the raw materials for the impact-resistant glass do not use carbon, magnesium oxide, and potassium oxide; the raw materials for the molten salt do not use silicic acid and phosphoric acid; and no surface film treatment is performed.

[0075] Comparative Example

[0076] Comparative Example 1, an impact-resistant glass, differs from Example 15 in that 12 kg of alumina and 0.5 kg of zirconium oxide are used.

[0077] Comparative Example 2, an impact-resistant glass, differs from Example 15 in that 22 kg of alumina and 3 kg of zirconium oxide are used; 2 kg of boron oxide and 2 kg of calcium oxide are used.

[0078] Comparative Example 3, an impact-resistant glass, differs from Example 15 in that it uses lithium silicate with an average particle size of 20 μm to replace the ceramic micropowder in equal amounts.

[0079] Comparative Example 4, an impact-resistant glass, differs from Example 15 in that it does not use ceramic micropowder.

[0080] Comparative Example 5, an impact-resistant glass, differs from Example 15 in that it does not use ceramic micropowder, and 12 kg of alumina is used.

[0081] Performance testing

[0082] Test 1: Impact Resistance

[0083] The impact-resistant glass samples of Examples 1-15 and Comparative Examples 1-5 were subjected to a drop ball impact tester using a 1040g steel ball. The drop ball impact test was conducted on each impact-resistant glass sample to detect the initial height of the steel ball from the flat glass sample when the glass sample was broken by the impact of the steel ball. The test results are shown in Table 4.

[0084] Test 2: Acid Resistance

[0085] According to GB / T 7962.14-2010 "Test Methods for Acid Resistance of Colorless Optical Glass", the impact resistance of the glass in Examples 1-15 and Comparative Examples 1-5 was tested. Grade 1 indicates the best acid resistance, and Grade 6 indicates the worst acid resistance. The test results are shown in Table 4.

[0086] Table 4. Evaluation results of impact strength and acid resistance of the impact-resistant glass used in Examples 1-15 and Comparative Examples 1-5

[0087]

[0088]

[0089] Combining Examples 1-15 and Comparative Examples 1-5 with Table 4, it can be seen that:

[0090] The impact resistance of the impact-resistant glass in Examples 1 to 15 is higher than that in Comparative Examples 1 to 5, indicating that the use of silicon dioxide, alumina, zirconium oxide, calcium oxide, sodium oxide, boron oxide and ceramic micro powder in the raw materials of the impact-resistant glass, and the optimization of the dosage of each raw material, improves the impact resistance of the impact-resistant glass.

[0091] The reason for this may be that the raw materials for impact-resistant glass use ceramic micropowder with a crystalline structure. This crystalline ceramic micropowder is more evenly distributed in the amorphous structure of the impact-resistant glass. Furthermore, the raw materials for impact-resistant glass use ceramic micropowder in combination with alumina and zirconium oxide, which have good toughening effects. This enhances the synergistic performance between the crystalline structure of the ceramic micropowder and the amorphous structure in the impact-resistant glass. As a result, under the impact force, the ceramic micropowder can better absorb the impact energy and reduce the propagation of cracks, thereby improving the impact resistance of the impact-resistant glass.

[0092] The impact resistance of the impact glass in Comparative Example 1 is relatively low, possibly because as the content of alumina and zirconium oxide decreases, the interaction force and synergistic performance between the crystalline structure of the ceramic micropowder and the amorphous structure in the impact glass decrease, resulting in a reduction in the impact energy absorbed by the ceramic micropowder.

[0093] The impact resistance and acid resistance of the impact glass in Comparative Example 2 decreased, possibly because as the content of alumina and zirconium oxide increased, the toughness of the impact glass increased, but the strength decreased; as the content of boron oxide and calcium oxide decreased, the reinforcement of the impact glass was insufficient, and the corrosion resistance and stability decreased, which in turn led to a decrease in the impact resistance and acid resistance of the prepared impact glass.

[0094] The decrease in impact resistance of the glass in Comparative Example 3 may be because although lithium silicate also has a crystalline structure, the main components of ceramic micropowder are SiO2 and Al2O3. Compared with lithium silicate, ceramic micropowder is closer to the composition of glass. Compared with lithium silicate, the synergistic performance between the crystalline structure of ceramic micropowder and the amorphous structure in the glass is better. Ceramic micropowder can absorb more impact energy, thereby improving impact resistance.

[0095] The impact resistance of the glass in Examples 1 to 3 was higher than that in Example 4, indicating that the use of glycidyl acrylate in the spraying liquid improved the impact resistance of the glass.

[0096] The reason may be that glycidyl acrylate contains carbon-carbon double bonds and epoxy groups. The epoxy groups can react with the hydroxyl groups in the hydroxy phosphate on the surface of the glass blank, thereby increasing the interaction force and synergistic performance between the film layer and the tempered glass blank, and thus improving the impact resistance of the glass.

[0097] The impact resistance of the glass in Examples 1 to 3 was higher than that in Example 5, indicating that the use of glycidyl acrylate and castor oil in the spray solution improved the impact resistance of the glass.

[0098] The reasons may be as follows: glycidyl acrylate can enhance the interaction force and synergistic performance between the coating film and the tempered glass blank; castor oil with multifunctional groups can increase the crosslinking degree of the coating film, further improving the impact resistance, strength, corrosion resistance and stability of the coating film; the combination of glycidyl acrylate and castor oil can improve the impact resistance and acid resistance of the prepared coating and the glass.

[0099] The impact resistance against glass in Examples 1 to 3 was higher than that in Examples 6 to 7, indicating that the use of perfluorooctyl acrylate in the spraying liquid, and the use of fluorinated acrylate in combination with methyl silicone resin, divinyl silicone, glycidyl acrylate, butyl acrylate, castor oil and methyl methacrylate, improved the stability against glass.

[0100] The reason may be that: the use of fluorinated acrylates in combination with methyl silicone resin and divinyl silicone further reduces the surface energy of the film layer, thereby improving the waterproof, self-cleaning, acid and alkali resistance of the film layer; the use of fluorinated acrylates in combination with glycidyl acrylate, butyl acrylate, castor oil and methyl methacrylate improves the density, mechanical properties and adhesion of the film layer formed by the spray liquid on the glass surface, so that the prepared film layer and the glass have excellent impact resistance and acid resistance.

[0101] The impact resistance of the impact-resistant glass in Examples 1 to 3 is higher than that in Example 8, indicating that ceramic powder, alumina and zirconium oxide work synergistically in the raw materials of the impact-resistant glass, and the optimal amount of alumina and zirconium oxide and the particle size of ceramic powder further improve the impact resistance of the impact-resistant glass.

[0102] The reason for this may be that there are differences between crystalline ceramic powder and amorphous glass. When the particle size of ceramic powder is too large, it becomes an internal defect in the glass. Under the impact of external forces, stress is concentrated at the ceramic powder. Furthermore, when the content of alumina and zirconium oxide in the raw materials of impact-resistant glass decreases, cracks in the glass are more likely to propagate. In addition, the decrease in the content of alumina and zirconium oxide weakens the bonding force between ceramic powder and glass structure, reducing the buffering effect of ceramic powder and thus reducing the impact resistance of impact-resistant glass.

[0103] The impact resistance of the impact-resistant glass in Examples 1 to 3 is higher than that in Examples 9 and 10, indicating that the use of carbon, magnesium oxide and potassium oxide in the raw materials of the impact-resistant glass improves its impact resistance.

[0104] The reasons may be as follows: magnesium oxide is used to improve the heat resistance, chemical stability and mechanical strength of impact glass; potassium oxide improves the glass processing performance; and carbon can promote the uniform dispersion of various raw materials in impact glass, enhance the hardness of glass and improve its UV resistance. The use of magnesium oxide, potassium oxide and carbon in the raw materials of impact glass can improve the overall performance of the prepared impact glass, thereby improving the impact resistance and stability of impact glass.

[0105] The impact resistance of the impact-resistant glass in Examples 1 to 3 is higher than that in Examples 11 to 13, indicating that the use of phosphoric acid and silica in the raw materials of the molten salt improves the impact resistance of the impact-resistant glass.

[0106] The reason for this may be that phosphoric acid, silicate, calcium hydroxide, and potassium hydroxide are used in combination in the molten salt. Phosphoric acid and silicate can react with calcium hydroxide and / or potassium hydroxide to generate hydroxyphosphate and silicate. The hydroxyphosphate and silicate are deposited in the microcracks caused by high temperature during the tempering process of the impact glass. The hydroxyphosphate and silicate work together to reduce the expansion of microcracks caused by high temperature during tempering and / or eliminate microcracks. Furthermore, the hydroxyl groups in the hydroxyphosphate enhance the interaction force and synergistic effect between the tempered glass blank and the film layer formed by the spraying liquid, so that the prepared impact glass has excellent impact resistance.

[0107] The impact resistance of the impact-resistant glass in Examples 1 to 3 is higher than that in Examples 14 to 15, indicating that the use of carbon, magnesium oxide and potassium oxide in the raw materials of the impact-resistant glass, the use of silicic acid and phosphoric acid in the raw materials of the molten salt, and the surface film treatment improve the impact resistance and acid resistance of the impact-resistant glass.

[0108] The reasons for this may be as follows: the use of carbon, magnesium oxide, and potassium oxide in the raw materials of impact glass improves the uniform dispersion of the raw materials and enhances the stability of the glass; the use of silicic acid and phosphoric acid in the raw materials of molten salt reduces and / or eliminates the expansion of microcracks caused by high temperature during the tempering process of impact glass, further improving the impact resistance of impact glass; furthermore, a film layer with good flexibility and certain impact resistance is formed on both sides of the surface of the tempered glass blank, and the film layer has good bonding force and synergistic effect with the tempered glass blank, so that the prepared impact glass has excellent impact resistance and acid resistance.

[0109] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A process for preparing impact-resistant glass, characterized in that, The preparation steps include the following: Preparation of the premix: The raw materials for impact glass are ground separately and then stirred evenly to form a premix; Preparation of glass preforms: The premix is ​​heated to the melting temperature of 1600-1700℃, stirred to form molten glass, the molten glass is poured into a mold, cooled, demolded, and the glass preform is obtained. Tempering treatment: The glass blank is placed in molten salt for tempering treatment, followed by cooling and cleaning to prepare impact glass; The raw materials for the impact-resistant glass, by weight, include 80-100 parts of silicon dioxide, 15-20 parts of aluminum oxide, 1-2 parts of zirconium oxide, 3-6 parts of calcium oxide, 1-5 parts of sodium oxide, 2-6 parts of boron oxide, and 5-10 parts of ceramic micro powder. The raw materials for the molten salt, by mass, include 0.5-1.5 parts potassium hydroxide, 0.5-1.0 parts calcium hydroxide, 0.2-0.5 parts aluminum oxide, 0.5-2 parts phosphoric acid, 0.2-1.5 parts potassium phosphate, and 85-95 parts potassium nitrate.

2. The manufacturing process of impact-resistant glass according to claim 1, characterized in that, The raw materials for the molten salt also include 0.5-1.5 parts by weight of silicic acid.

3. The manufacturing process of impact-resistant glass according to claim 1, characterized in that, The tempering process is carried out at a temperature of 400℃-550℃ for 2-8 hours; the cooling step in the tempering process involves immersion in water at 40-60℃ for 2-5 hours.

4. The manufacturing process of impact-resistant glass according to claim 1, characterized in that, The manufacturing process of the impact-resistant glass also includes surface film treatment; the surface film treatment process is as follows: The tempered glass blank is preheated to a spraying temperature of 30-45℃, and the spraying liquid is sprayed onto the surfaces of both sides of the preheated tempered glass blank. Then, it is cured at 100-120℃ to form a film layer. The raw materials of the spraying liquid, by weight, include 10-20 parts of methyl MQ silicone resin, 10-20 parts of divinyl silicone oil, 3-10 parts of glycidyl acrylate, 3-8 parts of butyl acrylate, 3-8 parts of methyl methacrylate, 0.5-1.5 parts of castor oil, 15-20 parts of xylene, 0.001-0.01 parts of dibutyltin dibutylsilicate, and 0.001-0.01 parts of azobisisobutyronitrile.

5. The manufacturing process of impact-resistant glass according to claim 4, characterized in that, The raw materials of the spraying liquid also include 1-5 parts by weight of fluorinated acrylate, wherein the fluorinated acrylate is at least one of perfluorooctyl acrylate, hexafluorobutyl methacrylate, and perfluorodecyl acrylate.

6. The manufacturing process of impact-resistant glass according to claim 4, characterized in that, The thickness of the film is 6-9 μm.

7. The manufacturing process of impact-resistant glass according to claim 1, characterized in that, The average particle size of the ceramic micro powder is below 35 μm.

8. The manufacturing process of impact-resistant glass according to claim 1, characterized in that, The raw materials for the impact-resistant glass also include 3-6 parts of magnesium oxide and 0.5-1.5 parts by weight of potassium oxide.

9. The manufacturing process of impact-resistant glass according to claim 1, characterized in that, The raw materials for the impact-resistant glass also include 2-3 parts by weight of carbon.

10. An impact-resistant glass obtained by a process for preparing impact-resistant glass according to any one of claims 1-9.

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