A coating for improving glass toughening efficiency and a preparation method thereof, and a glass toughening method

Abstract

The application discloses a coating for improving glass toughening efficiency, a preparation method of the coating, a glass toughening method, and raw materials for forming the coating and weight percentages of the raw materials, wherein the raw materials are as follows: 10-20% of carbon black, 20-30% of diethylene glycol monobutyl ether, 15-35% of ethyl acetate, 3-methoxy butyl acetate less than 10%, and the rest is butanone; the coating can greatly accelerate the heat absorption rate of the glass, so that the glass reaches the required temperature in a shorter time, and the production efficiency is greatly improved; and the coating is modified at high temperature, and the texture becomes loose; in the glass toughening, the coating is blown away by means of a fan, and the glass surface quality and subsequent processing of the product are not affected.

Description

Technical Field

[0001] This invention belongs to the field of glass technology, specifically relating to a coating for improving glass tempering efficiency, its preparation method, and a glass tempering method. Background Technology

[0002] Tempered glass is a type of glass with high safety. It is made by processing ordinary glass through controlled heat or chemical treatment to increase its strength. Common tempering methods are chemical tempering and physical tempering. Chemical tempering strengthens the glass through ion exchange, while physical tempering works by heating the glass to a suitable temperature and then rapidly cooling it. This causes the glass surface to contract sharply, generating compressive stress, while the middle layer of the glass cools more slowly and does not have time to contract, thus creating tensile stress and giving the glass higher strength.

[0003] There are many physical tempering methods. According to the cooling medium, they can be divided into: gas medium tempering, liquid medium tempering, microparticle tempering, and mist tempering. Among them, gas medium tempering, also known as air-cooled tempering, is a production method that increases the mechanical strength and thermal stability of glass by heating the glass to near its softening temperature and then blowing air onto both sides of it simultaneously.

[0004] Existing gas-medium tempering methods require heating the glass to a high temperature of around 600℃-650℃. Heating the glass mainly relies on thermal radiation. However, since glass is transparent and has high light transmittance, most of the thermal radiation is wasted by passing through the glass, resulting in a slow glass heating rate and a bottleneck in production efficiency, making it difficult to further increase production capacity. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a coating for improving glass tempering efficiency and its preparation method. This coating can significantly increase the heat absorption rate of the glass and can be removed during the air-cooling process after tempering, thereby increasing production capacity and reducing unit power consumption.

[0006] The present invention also provides a method for tempering glass, wherein a coating for improving the tempering efficiency of glass is formed on the glass surface as described in the present invention, and then the glass is sent into a tempering furnace for tempering. After tempering, the coating is removed by air cooling, without the need for an additional coating removal process.

[0007] The technical solution adopted in this invention is as follows:

[0008] A coating for improving glass tempering efficiency is characterized by the following raw materials and their weight percentages forming the coating: carbon black 10-20%, diethylene glycol monobutyl ether 20-30%, ethyl acetate 15-35%, 3-methoxyethyl acetate ≤10%, and the remainder being butanone. In this raw material, carbon black acts as an endothermic agent; ethyl acetate and 3-methoxyethyl acetate act as modifiers, improving the adhesion between the coating and glass during coating formation because the long molecular chains and high viscosity of lipids better fix the carbon black powder to the glass surface. Furthermore, during the heating process, the coating's looseness is increased, making it easier to remove by air cooling after tempering; butanone and diethylene glycol monobutyl ether act as solvents, adjusting the solid content of the coating raw materials and facilitating rapid drying after coating application.

[0009] The raw materials forming the coating and their weight percentages are preferably as follows: 12-18% carbon black, 25-30% diethylene glycol monobutyl ether, 20-30% ethyl acetate, 4-10% 3-methoxyethyl acetate, and the remainder being butanone.

[0010] The fineness of the carbon black is 8-10 mm.

[0011] The present invention also provides a method for preparing the coating for improving the efficiency of glass tempering, the method comprising the following steps: mixing the raw materials in the specified amount, grinding and stirring them into a uniform turbid liquid, and then uniformly spraying it onto the glass surface.

[0012] The present invention also provides a method for tempering glass, wherein a coating for improving the tempering efficiency of glass is formed on the upper surface of the glass before the glass enters the tempering furnace, and then the glass is sent into the tempering furnace for tempering. After tempering, the coating is removed by air cooling.

[0013] The coating thickness is 20-30 μm.

[0014] The tempering temperature is 675–685°C, and the tempering time is 135–145 seconds.

[0015] The glass is float glass with a thickness of 3mm to 6mm.

[0016] The raw materials for the coating used to improve glass tempering efficiency provided by this invention include carbon black, which increases the blackness of the coating, improves its heat absorption efficiency, prevents heat radiation from passing through the glass, and significantly enhances the heat absorption rate of the inner glass layer. The butanone and diethylene glycol monobutyl ether in the raw materials have a certain degree of volatility. During the transport section, as they volatilize, a dry and dense coating can be formed before the glass enters the tempering furnace. After entering the tempering furnace, during the curing and heating process, the butanone and diethylene glycol monobutyl ether further volatilize, while ethyl acetate and 3-methoxyethyl acetate undergo high-temperature decomposition, releasing carbon dioxide and water vapor. The volatilization of these gases loosens the coating texture. After the glass exits the furnace, during cooling within the air duct, the loose coating is blown away by the high-powered fan, leaving only the qualified glass substrate. This glass substrate can then be packaged and boxed normally. The operating process is simple and requires no additional cleaning equipment.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The coating provided by this invention for improving glass tempering efficiency has a simple raw material composition. This coating can significantly increase the heat absorption rate of glass, allowing the glass to reach the required temperature in a shorter time, greatly improving production efficiency. Moreover, the coating will modify at high temperatures and become loose. During glass tempering, the coating can be blown off with the help of a fan without affecting the surface quality of the glass or the subsequent processing of the product.

[0019] The glass tempering method provided by this invention can significantly reduce the tempering temperature and time, increase the production capacity of tempered glass, and reduce unit power consumption. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the coating of the present invention on a glass surface; wherein, 1-glass, 2-coating. Detailed Implementation

[0021] This invention provides a coating for improving the efficiency of glass tempering. The raw materials forming the coating and their weight percentages are as follows: carbon black 10-20%, diethylene glycol monobutyl ether 20-30%, ethyl acetate 15-35%, 3-methoxyethyl acetate ≤10%, and the remainder is butanone.

[0022] The preparation method of the coating includes the following steps: mixing the raw materials in the formula amount, grinding and stirring them into a uniform turbid liquid, and then uniformly spraying it onto the glass surface. During the process of the glass being conveyed into the tempering furnace, a uniform coating can be formed on the glass surface as the solvent evaporates naturally.

[0023] The present invention provides a method for tempering glass, wherein a coating is formed on the upper surface of the glass before the glass enters the tempering furnace, and then the glass is sent into the tempering furnace for tempering. After tempering, the coating is removed by air cooling.

[0024] The coating thickness is 20-30 μm.

[0025] The tempering temperature is 675–585°C, and the tempering time is 135–145 seconds.

[0026] The present invention will now be described in detail with reference to the embodiments.

[0027] Example 1

[0028] A coating for improving the efficiency of glass tempering, wherein the raw materials forming the coating and their weight percentages are as follows: 20% carbon black, 25% diethylene glycol monobutyl ether, 22% ethyl acetate, 8% 3-methoxyethyl acetate, and the remainder is butanone.

[0029] Example 2

[0030] A coating for improving the efficiency of glass tempering, wherein the raw materials forming the coating and their weight percentages are as follows: 15% carbon black, 25% diethylene glycol monobutyl ether, 25% ethyl acetate, 5% 3-methoxyethyl acetate, and the remainder is butanone.

[0031] Example 3

[0032] A coating for improving the efficiency of glass tempering, wherein the raw materials forming the coating and their weight percentages are as follows: carbon black 18%, diethylene glycol monobutyl ether 28%, ethyl acetate 23%, 3-methoxyethyl acetate 6%, and the remainder being butanone.

[0033] Example 4

[0034] A coating for improving the efficiency of glass tempering, wherein the raw materials forming the coating and their weight percentages are as follows: 12% carbon black, 30% diethylene glycol monobutyl ether, 21% ethyl acetate, 9% 3-methoxyethyl acetate, and the remainder being butanone.

[0035] Example 5

[0036] A coating for improving the efficiency of glass tempering, wherein the raw materials forming the coating and their weight percentages are as follows: 14% carbon black, 30% diethylene glycol monobutyl ether, 30% ethyl acetate, 9% 3-methoxyethyl acetate, and the remainder being butanone.

[0037] The raw materials and weight percentages of the coatings in the above embodiments are shown in Table 1.

[0038] Table 1

[0039] carbon black 20 15 18 12 14 Diethylene glycol monobutyl ether 25 25 28 30 30 Ethyl acetate 22 25 23 21 17 3-Methoxyethyl Butyl 8 5 6 9 9 Butanone 25 30 25 28 30

[0040] Comparative Example 1

[0041] The rest is the same as in Example 1, except that all ethyl acetate in the raw materials is replaced with an equal amount of butanone.

[0042] The coating materials from the above embodiments and comparative examples are mixed according to the formula, and then ground and stirred to form a uniform turbid liquid. This turbid liquid is added to a spray gun. As the glass passes through, the spray gun controls multiple nozzles to work simultaneously, uniformly spraying the turbid liquid onto the glass surface. In the transport section, various solvents evaporate naturally. Before the glass enters the tempering furnace, the coating is dry and dense. Subsequently, the glass enters the tempering furnace for normal sintering. During sintering in the furnace, the carbon black in the coating helps absorb heat and prevents heat radiation from passing through the glass, thus greatly enhancing the heat absorption rate of the inner glass layer. After the glass exits the furnace, during cooling in the air duct, the loose coating is blown away by the high-powered fan, leaving only qualified glass. The glass is then packaged and boxed normally.

[0043] Green float glass with a thickness of 4mm and a size of 300mm*300mm was tempered according to the above steps using a ten-station window and door furnace. The tempering furnace temperature, tempering holding time, furnace exit temperature, and power consumption required for tempering were statistically analyzed after coating the glass surface with the coatings used in the various embodiments and comparative examples. The same type of glass tempered without coating was used as a control. The results are shown in Table 2.

[0044] Table 2

[0045]

[0046] As can be seen from Table 2, compared with the control group, Examples 1-5 showed significantly lower tempering temperature and tempering time, and significantly reduced energy consumption.

[0047] In contrast, the coating in Comparative Example 1 had poor adhesion and a lot of peeling after spraying, resulting in poor coating uniformity. It still required a high tempering temperature and a long tempering time during tempering, and consumed a lot of energy.

[0048] The above-described detailed description of a coating for improving glass tempering efficiency, its preparation method, and the glass tempering method, with reference to the embodiments, is illustrative rather than limiting. Several embodiments may be listed within the defined scope. Therefore, variations and modifications without departing from the overall concept of the present invention should be within the protection scope of the present invention.

Claims

1. A coating for improving the efficiency of glass tempering, characterized in that, The raw materials forming the coating and their weight percentages are as follows: carbon black 10-20%, diethylene glycol monobutyl ether 20-30%, ethyl acetate 15-35%, 3-methoxyethyl acetate ≤10%, and the remainder is butanone.

2. The coating for improving glass tempering efficiency according to claim 1, characterized in that, The raw materials forming the coating and their weight percentages are as follows: carbon black 12-18%, diethylene glycol monobutyl ether 25-30%, ethyl acetate 20-30%, 3-methoxyethyl acetate 4-10%, and the remainder is butanone.

3. The coating for improving glass tempering efficiency according to claim 1 or 2, characterized in that, The fineness of the carbon black is 8-10 mm.

4. The method for preparing the coating for improving glass tempering efficiency as described in any one of claims 1-3, characterized in that, The preparation method includes the following steps: mixing the raw materials in the specified amount, grinding and stirring them into a uniform turbid liquid, and then uniformly spraying it onto the glass surface.

5. A method for tempering glass, characterized in that, Before the glass enters the tempering furnace, a coating as described in any one of claims 1-3 is formed on the upper surface of the glass to improve the tempering efficiency. The glass is then sent into the tempering furnace for tempering. After tempering, the coating is removed during the air cooling process.

6. The glass tempering method according to claim 5, characterized in that, The coating thickness is 20-30 μm.

7. The glass tempering method according to claim 5, characterized in that, The tempering temperature is 675–685°C, and the tempering time is 135–145 seconds.

8. The method for tempering glass according to claim 5, characterized in that, The glass is float glass with a thickness of 3mm to 6mm.

9. The glass tempering method according to claim 5, characterized in that, The air cooling refers to the cooling of the glass inside the air grid after it comes out of the furnace.

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