A coating material for improving the strength of glass bottles and cans and a method for preparing the same

Abstract

The application discloses a coating material for improving the strength of glass bottles and cans and a preparation method thereof. 3 1.00~3.90%, ZnO 2.10~4.80%, MgO 16.00~20.00%, Al2O3 23.10~30.00%, SiO 2 48.00~52.20%. First, raw materials are uniformly mixed, and then amorphous powder is obtained through high-temperature melting, water quenching, ball milling, drying and sieving; then, the amorphous powder is sprayed on the outer surface of the shaped bottle and can glass through a spraying process; finally, the surface of the bottle and can glass treated in the second step is heated through a flame heating method, and the surface burrs are eliminated through a fire polishing process, so that a high-strength glass bottle and can product is obtained. The application not only helps to greatly save raw materials and reduce production energy consumption, but also significantly reduces downstream transportation and storage costs, and has wide market application value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of advanced glass materials, and particularly relates to a coating material for improving the strength of glass bottles and cans and a preparation method thereof. BACKGROUND

[0002] Glass bottles and cans are widely used as packaging materials for beer, carbonated beverages, liquor, food, medicine, etc., and play an important role in the packaging industry. With the increasing popularity of the concept of green and low-carbon and the development of circular economy, glass packaging is favored by the market for its recyclability, non-pollution, good chemical stability and other advantages, and has broad application prospects and market potential.

[0003] At present, bottle and can glass products are mainly based on the traditional Na2O-CaO-SiO2 system. The glass of this system has the characteristics of relatively low melting temperature and difficulty in crystallization, and the glass containers prepared therefrom exhibit good comprehensive performance in mechanical properties, thermal properties and chemical stability. However, the bending strength is generally low, usually not more than 90 MPa, which leads to easy breakage of the products during transportation and storage, especially when there is pressure in the container, the risk of breakage increases significantly. In order to ensure safety, beer bottles, soda bottles and other products often need to increase the wall thickness during design, which limits the lightweight development.

[0004] Taking beer bottles as an example, lightweight has become an important development trend in the industry. By reducing the weight of the bottle, not only can raw material consumption and energy consumption be effectively reduced, but also production costs can be saved for enterprises, and transportation and storage burdens for downstream customers can be reduced. According to the relevant standards of lightweight beer bottles, the internal pressure resistance of recyclable superior products should be not less than 1.6 MPa, and the impact resistance should be not less than 0.8 J. However, in actual sampling inspection, most products can only reach the level of first-class products or qualified products (internal pressure resistance ≥1.2 MPa, impact resistance ≥0.6 J), and the proportion of superior products is still low, reflecting the challenges in realizing lightweight under the existing material system.

[0005] Promoting the lightweight of bottle and can glass is an inevitable requirement for realizing green manufacturing and reducing costs for enterprises. However, if the existing Na2O-CaO-SiO2 formula and corresponding production process are completely changed to high-strength glass system, it involves equipment modification and process reconstruction, which has high investment and risk, and enterprises face great transformation pressure. Therefore, if the existing mature formula system and production process can be optimized to effectively improve the internal pressure resistance and impact resistance of glass containers, it will become a more feasible and economical path to realize lightweight. SUMMARY

[0006] The coating material for improving the strength of glass bottles and cans has the advantages of simple process, low cost and superior performance.

[0007] The coating material for improving the strength of glass bottles and cans has the advantages of simple process, low cost and superior performance. 2.10-4.80%, MgO 16.00-20.00%, Al2O3 23.10-30.00%, SiO2 48.00-52.20%.

[0008] The components in the chemical composition of the coating material are introduced in the form of oxides.

[0009] The SiO2, MgO and part of Al2O3 in the chemical composition of the coating material are introduced by kaolin and talc, B2O3 is introduced by boric acid, and the others are introduced in the form of oxides.

[0010] The preparation method of the coating material for improving the strength of glass bottles and cans has the advantages of simple process, low cost and superior performance.

[0011] Step one: the raw materials are mixed according to the chemical composition of the coating material, and then the non-crystalline powder for strengthening the glass bottles and cans is obtained by high temperature melting, water quenching, ball milling, drying and sieving.

[0012] Step two: the non-crystalline powder prepared in step one is sprayed on the outer surface of the shaped bottle and can glass by spraying process, so that the non-crystalline powder and the surface of the bottle and can glass form a close combination.

[0013] Step three: the surface of the bottle and can glass treated in step two is heated by flame heating, so that the sprayed non-crystalline powder is melted at high temperature and forms an integral whole with the glass surface, and the surface burrs are eliminated by fire polishing process to obtain high strength glass bottle and can products.

[0014] The temperature of high temperature melting in step one is 1520-1590℃, and the holding time is 1-3 hours.

[0015] The powder particle size of the non-crystalline powder in step one is 200-325 mesh.

[0016] The spraying process in step two is one of plasma spraying, electric arc spraying and flame spraying.

[0017] The temperature of the bottle and can glass in step two is 530-650℃.

[0018] The flame heating temperature in step three is 1230-1310℃, and the fire polishing temperature is the same as the flame heating temperature.

[0019] The internal pressure resistance of the high-strength glass bottle and can product obtained in the step three is 1.90-2.36 MPa, and the impact resistance is 0.96-1.35 J.

[0020] The technical principle of the application is that a small amount of B2O3 and ZnO is added in the low thermal expansion MgO-Al2O3-SiO2 glass system, which reduces the glass melting temperature (<1600 ℃) while ensuring that the glass still has a small thermal expansion coefficient (<4.0*10 -6 ℃ -1 ). The melted glass is water quenched, ground, dried, and sieved to form a standardized powder, which is convenient for later combination with the bottle and can glass surface in the form of spraying. After spraying, high-temperature fire polishing is performed, which on the one hand ensures that the powder melts to form a whole with the bottle and can glass surface, and on the other hand eliminates the grainy feeling and burrs on the bottle and can glass surface, so that the surface of the bottle and can glass becomes smooth. Since the average thermal expansion coefficient of the Na2O-CaO-SiO2 system glass is 7.5-9.0*10 -6 ℃ -1 between room temperature and 600 ℃, and the average thermal expansion coefficient of the MgO-Al2O3-SiO2 glass system in this temperature range is less than 4.0*10 -6 ℃ -1 , when a layer of MgO-Al2O3-SiO2 glass is formed on the surface of the bottle and can glass of the Na2O-CaO-SiO2 system, a compressive stress will be formed on the surface of the bottle and can during the cooling process, thereby improving the internal pressure resistance and impact resistance of the bottle and can, that is, the wall thickness of the container can be reduced to achieve the weight reduction and light weight of the glass packaging while ensuring safety.

[0021] The technical solution has the following beneficial effects:

[0022] (1) Reduce the melting temperature of MgO-Al2O3-SiO2 glass: the melting temperature of the MgO-Al2O3-SiO2 system glass is usually above 1600 ℃, and by adding an appropriate amount of B2O3 and ZnO, the melting of the cordierite glass can be completed below 1600 ℃, while the glass still has a thermal expansion coefficient of less than 4.0*10 -6 ℃ -1 .

[0023] (2) Significantly improve the internal pressure resistance and impact resistance of the bottle and can glass, and after treatment by the technology, taking a light weight beer bottle (330 ml, 205 g) as an example, the internal pressure resistance is improved from 1.2 MPa to 1.90-2.36 MPa, and the impact resistance is improved from 0.6 J to 0.96-1.35 J.

[0024] (3) By applying a specific coating treatment on the surface of the bottle and can glass, effectively reducing the surface micro-defects, and inducing the formation of a stable compressive stress layer in the surface layer, thereby significantly improving the internal pressure resistance and impact resistance of the glass product. This technology does not need to change the main body composition and core melting process of the glass, which can reduce the wall thickness of the container under the premise of safety, and realize the weight reduction and light weight of the glass packaging. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A comparison chart of the cross section of the ordinary beer bottle (290 grams) of Example 1 and the lightweight beer bottle (205 grams) prepared by using the present technology. DETAILED DESCRIPTION

[0026] In order to further illustrate the present application, the technical means and effects taken to achieve the intended purpose of the present application are as follows: Example 1

[0027] A coating material for improving the strength of glass bottles and cans, the chemical composition of the coating material is as follows: B2O3 1.00%, ZnO 4.00%, MgO 20.00%, Al2O3 25.00%, SiO2 50.00%.

[0028] The SiO2, MgO and part of Al2O3 in the chemical composition of the coating material are introduced by kaolin and talc, B2O3 is introduced by boric acid, and the others are introduced in the form of oxide.

[0029] The preparation method of the coating material for improving the strength of glass bottles and cans, comprising the following steps:

[0030] Step one: mix the raw materials according to the chemical composition of the coating material, melt at high temperature, quench with water, ball mill, dry, sieve, and obtain amorphous powder for strengthening glass bottles and cans;

[0031] Step two: use the spraying process to spray the amorphous powder prepared in step one on the outer surface of the shaped bottle and can glass, so that the amorphous powder and the bottle and can glass surface form a close combination;

[0032] Step three: heat treat the bottle and can glass surface treated in step two by flame heating, so that the sprayed amorphous powder melts at high temperature and forms an integral whole with the glass surface, and then eliminate surface burrs by fire polishing process to obtain high-strength glass bottle and can products.

[0033] The temperature of high-temperature melting in step one is 1590°C, and the holding time is 1 hour.

[0034] The particle size of the amorphous powder in step one is 200 mesh.

[0035] The thermal expansion coefficient of the bottle and can glass in step two is 3.92 x 10 -6 ℃ -1 .

[0036] The spraying process in step two is flame spraying.

[0037] The temperature of the bottle and can glass in step two is 650℃.

[0038] The flame temperature and the fire polishing temperature in step three are 1260℃.

[0039] The high-strength glass bottle and can product is obtained in step three, taking the lightweight beer bottle (330 ml, 205 grams) as an example, the internal pressure resistance is 2.36 MPa, and the impact resistance is 0.96 J. Embodiment 2

[0040] A coating material for improving the strength of glass bottles and cans, characterized in that the chemical composition of the coating material is: B2O3 3.90%, ZnO 2.10%, MgO 16.00%, Al2O3 30.00%, SiO2 48.00%.

[0041] The components in the chemical composition of the coating material are introduced in the form of oxides.

[0042] The preparation method of the coating material for improving the strength of glass bottles and cans comprises the following steps:

[0043] Step one: mix the raw materials according to the chemical composition of the coating material, melt at high temperature, quench with water, ball mill, dry, and sieve to obtain amorphous powder for strengthening bottle and can glass;

[0044] Step two: use a spraying process to spray the amorphous powder prepared in step one onto the outer surface of the formed bottle and can glass, so that the amorphous powder and the bottle and can glass surface form a close combination;

[0045] Step three: heat treat the bottle and can glass surface treated in step two by flame heating, so that the sprayed amorphous powder melts at high temperature and forms an integral whole with the glass surface, and a high-strength glass bottle and can product is obtained by eliminating surface burrs through fire polishing process.

[0046] The temperature of high-temperature melting in step one is 1560℃, and the holding time is 2 hours.

[0047] The powder particle size of the amorphous powder in step one is 250 mesh.

[0048] The thermal expansion coefficient of the bottle and can glass in step two is 3.75 x 10 -6 ℃-1 .

[0049] The spraying process in the step two is plasma spraying.

[0050] The temperature of the bottle and can glass in the step two is 590℃.

[0051] The flame temperature and the fire polishing temperature in the step three are 1230℃.

[0052] The high-strength glass bottle and can product is obtained in the step three, taking the lightweight beer bottle (330 ml, 205 g) as an example, the internal pressure resistance is 2.25 MPa, and the impact resistance is 1.10 J. Embodiment 3

[0053] A coating material for improving the strength of glass bottle and can, characterized in that the chemical composition of the coating material is: B2O3 2.30%, ZnO 4.80%, MgO 17.60%, Al2O3 23.10%, SiO2 52.20%.

[0054] The B2O3 in the chemical composition of the coating material is introduced by boric acid, and the others are introduced in the form of oxide.

[0055] The preparation method of the coating material for improving the strength of glass bottle and can comprises the following steps:

[0056] Step one: uniformly mix raw materials according to the chemical composition of the coating material, melt at high temperature, quench with water, ball mill, dry, and sieve to obtain amorphous powder for strengthening bottle and can glass;

[0057] Step two: use a spraying process to spray the amorphous powder prepared in step one on the outer surface of the formed bottle and can glass, so that the amorphous powder is tightly combined with the surface of the bottle and can glass;

[0058] Step three: heat treat the surface of the bottle and can glass treated in step two by using a flame heating method, so that the sprayed amorphous powder melts at high temperature and forms an integral whole with the surface of the glass, and a high-strength glass bottle and can product is obtained after eliminating surface burrs by a fire polishing process.

[0059] The temperature of high-temperature melting in the step one is 1520℃, and the holding time is 3 hours.

[0060] The particle size of the amorphous powder in the step one is 325 mesh.

[0061] The thermal expansion coefficient of the bottle and can glass in the step two is 3.68×10 -6 ℃ -1 .

[0062] ​The spraying process in the second step is arc spraying.

[0063] The temperature of the bottle and can glass in the second step is 530℃.

[0064] The flame temperature and the fire polishing temperature in the third step are 1310℃.

[0065] In the third step, high-strength glass bottle and can products are obtained, for example, a light-weight beer bottle (330 ml, 205 g) has an internal pressure resistance of 1.90 MPa and an impact resistance of 1.35 J.

[0066] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the principles and spirit of the present application are included in the protection scope of the present application.

Claims

1. A coating material for enhancing the strength of glass bottles and jars, characterized by: The chemical composition of the coating material by weight percentage is: B2O3 1.00-3.90%, ZnO 2.10-4.80%, MgO 16.00-20.00%, Al2O3 23.10-30.00%, SiO2 48.00-52.20%; The method for preparing the coating material that enhances the strength of glass bottles and jars is characterized by comprising the following steps: Step 1: Mix the raw materials evenly according to the chemical composition of the coating material, and obtain amorphous powder for glass reinforcement of bottles and jars after high temperature melting, water quenching, ball milling, drying and sieving. Step 2: The amorphous powder prepared in Step 1 is sprayed onto the outer surface of the formed glass bottle or jar using a spraying process, so that the amorphous powder and the glass surface of the bottle or jar are tightly bonded. Step 3: The glass surface of the bottle after Step 2 is heated by flame heating, so that the sprayed amorphous powder melts at high temperature and forms a whole with the glass surface. At the same time, the surface burrs are removed by fire polishing process to obtain high-strength glass bottle products.

2. The coating material of claim 1, wherein: The components in the chemical composition of the coating material are introduced in the form of oxides.

3. The coating material of claim 1, wherein: The SiO2, MgO and part of the Al2O3 in the chemical composition of the coating material are introduced by kaolin and talc, B2O3 is introduced by boric acid, and the others are introduced in the form of oxides.

4. The coating material of claim 1, wherein: In step one, the high-temperature melting temperature is 1520–1590°C, and the holding time is 1–3 hours.

5. The coating material of claim 1, wherein: The particle size of the amorphous powder in step one is 200-325 mesh.

6. The coating material of claim 1, wherein: The spraying process in step two is one of plasma spraying, arc spraying, or flame spraying.

7. The coating material of claim 1, wherein: In step two, the temperature of the glass in the bottle or jar is 530–650°C.

8. The coating material of claim 1, wherein: In step three, the flame heating temperature is 1230–1310°C, and the flame polishing temperature is the same as the flame heating temperature.

9. The coating material of claim 1, wherein: In step three, the high-strength glass bottle and jar products obtained have an internal pressure resistance of 1.90–2.36 MPa and an impact resistance of 0.96–1.35 J.

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