阅读说明：本技术 一种镀膜玻璃生产的预加热方法及设备 (Preheating method and device for production of coated glass ) 是由 纪朋远 陈刚 王科 陈海峰 蔡敬 周志文 唐高山 陈诚 于 2020-04-29 设计创作，主要内容包括：本发明涉及镀膜玻璃技术领域,具体涉及一种镀膜玻璃生产的预加热方法及设备。该预加热方法包括如下步骤：步骤S1、玻璃基板预热：采用热风对玻璃基板表面进行吹淋,直至玻璃基板温度为40-60℃；步骤S2、镀膜液预热：将镀膜液升温至30-40℃,然后将升温后的镀膜液涂覆至步骤S1已预热的玻璃基板表面；步骤S3、后加热处理：采用热风对步骤S2涂覆有镀膜液的玻璃基材进行吹淋,使玻璃基材温度达到50-70℃,制得预加热的镀膜玻璃,备用,待固化。本发明的预加热方法操作简单,生产效率高,生产成本低,能加快湿膜状态下溶剂的挥发速率均匀性,提升膜层与玻璃基材之间的附着力,改善膜层透光率、耐候性及硬度。(The invention relates to the technical field of coated glass, in particular to a preheating method and preheating equipment for coated glass production. The preheating method comprises the following steps: step S1, preheating the glass substrate: blowing hot air to the surface of the glass substrate until the temperature of the glass substrate is 40-60 ℃; step S2, preheating the coating liquid: heating the coating liquid to 30-40 ℃, and then coating the preheated coating liquid on the surface of the glass substrate preheated in the step S1; step S3, post-heating treatment: and (4) blowing hot air to the glass substrate coated with the coating liquid in the step S2 to make the temperature of the glass substrate reach 50-70 ℃, and preparing preheated coated glass for later use and curing. The preheating method disclosed by the invention is simple to operate, high in production efficiency and low in production cost, and can accelerate the volatilization rate uniformity of the solvent in a wet film state, improve the adhesive force between the film layer and the glass substrate, and improve the light transmittance, weather resistance and hardness of the film layer.)

1. A preheating method for production of coated glass is characterized by comprising the following steps: the method comprises the following steps:

step S1, preheating the glass substrate: blowing hot air to the surface of the glass substrate until the temperature of the glass substrate is 40-60 ℃;

step S2, preheating the coating liquid: heating the coating liquid to 30-40 ℃, and then coating the preheated coating liquid on the surface of the glass substrate preheated in the step S1 to obtain a glass substrate (10) coated with the coating liquid;

step S3, post-heating treatment: and (4) blowing and showering the glass substrate (10) coated with the coating liquid in the step S2 by adopting hot air to enable the temperature of the glass substrate (10) to reach 50-70 ℃, and preparing preheated coated glass for standby and waiting for curing.

2. The method of claim 1, wherein the preheating step comprises: in the step S1, a first hot air device is used to blow and shower the surface of the glass substrate; and step S3, performing blowing spraying on the glass substrate coated with the coating liquid by adopting a second hot air device.

3. The method of claim 1, wherein the preheating step comprises: in the step S2, the coating liquid is heated, kept warm and stirred by a heating constant-temperature stirring device, and the coating liquid is conveyed to the coating equipment (21) through the liquid supply pipe (23) and the liquid supply pump (24) to coat the surface of the glass substrate (10).

4. A preheating method for coated glass production according to claim 3, wherein: in the step S2, the method includes a step of processing by using a backflow mechanism, the backflow mechanism includes a negative pressure liquid suction device (261), a filter (262) and a backflow pipe (263) which are connected in sequence, the negative pressure liquid suction device (261) sucks excess coating liquid flowing out in a coating and coating liquid process, a liquid inlet end of the backflow pipe (263) is communicated with the negative pressure liquid suction device (261), and a liquid outlet end of the backflow pipe (263) is communicated with the heating constant temperature stirring device.

5. A preheating apparatus used in a preheating method for producing a coated glass according to any one of claims 1 to 4, characterized in that: the device comprises a glass substrate preheating device (1), a preheating coating device (2) and a coating post-heating device (3) which are sequentially connected according to the using sequence; the glass substrate preheating device (1) comprises a first hot air device and a first conveying belt (12); the preheating coating device (2) comprises coating equipment (21), a heating constant-temperature stirring device, a liquid supply pipe (23), a liquid supply pump (24) and a second conveying belt (25); the heating device (3) after film coating comprises a second hot air device and a third conveying belt (32);

the first conveyor belt (12) carries and conveys the glass substrate (10) to a second conveyor belt (25), the second conveyor belt (25) carries and conveys the glass substrate (10) to a third conveyor belt (32); the first hot air device blows and sprays the glass substrate (10) to preheat, the heating constant-temperature stirring device heats, keeps warm and stirs the coating liquid, the liquid supply pump (24) pumps the coating liquid which is heated and preheated in the heating constant-temperature stirring device to the liquid supply pipe (23) and supplies the coating liquid to the coating equipment (21), and the coating device coats the coating liquid on the surface of the glass substrate (10); the second hot air device blows and sprays the glass substrate (10) coated with the coating liquid.

6. The preheating device for producing coated glass according to claim 5, wherein: the first hot air device comprises a first hot air blower (111), a plurality of first high-temperature ventilation pipes (112) and a plurality of first high-temperature air knives (113), the air inlet end of each first high-temperature ventilation pipe (112) is communicated with the air outlet end of the first fan, and the air outlet end of each first high-temperature ventilation pipe (112) is communicated with the air inlet end of one first high-temperature air knife (113); the air inlet end of the first air heater (111) is provided with air filter cotton; the included angle between the air outlet end of each first high-temperature air knife (113) and the surface of the glass substrate (10) is 40-90 degrees.

7. The preheating device for producing coated glass according to claim 5, wherein: heating constant temperature agitating unit includes first reservoir (221) and first heating constant temperature agitator (222), first heating constant temperature agitator (222) is right first reservoir (221) intensification, heat preservation and stirring, filming equipment (21) are including coating roller (211) and cistern (212), the feed liquor end and first reservoir (221) intercommunication of feed pipe (23), the play liquid end of feed pipe (23) with cistern (212) intercommunication, feed pump (24) set up in the middle part of feed pipe (23).

8. The preheating apparatus for producing coated glass according to claim 7, wherein: heating constant temperature agitating unit still includes return mechanism, return mechanism is including the negative pressure imbibition ware (261), filter (262) and back flow (263) that connect gradually, unnecessary coating liquid that coating liquid in-process flowed is drawn in negative pressure imbibition ware (261), the feed liquor end and the negative pressure imbibition ware (261) intercommunication of back flow (263), the play liquid end of back flow (263) with first reservoir (221) intercommunication.

9. The preheating apparatus for producing coated glass according to claim 8, wherein: heating constant temperature agitating unit still includes second reservoir (271), second heating constant temperature agitator (272), transfer pump (273) and transfer line (274), second heating constant temperature agitator (272) is right second reservoir (271) intensification, heat preservation and stirring, the feed liquor end and the second reservoir (271) intercommunication of transfer line (274), the play liquid end and the first reservoir (221) intercommunication of transfer line (274), transfer pump (273) sets up in the middle part of transfer line (274).

10. The preheating device for producing coated glass according to claim 5, wherein: the second hot air device comprises a second hot air blower (311), a plurality of second high-temperature ventilation pipes (312) and a plurality of second high-temperature air knives (313), the air inlet end of each second high-temperature ventilation pipe (312) is communicated with the air outlet end of the second fan, and the air outlet end of each second high-temperature ventilation pipe (312) is communicated with the air inlet end of one second high-temperature air knife (313); the air inlet end of the second air heater (311) is provided with air filter cotton; the included angle between the air outlet end of each second high-temperature air knife (313) and the surface of the glass substrate (10) is 40-90 degrees.

Technical Field

The invention relates to the technical field of coated glass, in particular to a preheating method and preheating equipment for coated glass production.

Background

At present, a roller coating process is mainly adopted for photovoltaic glass coating, namely, after a glass substrate is cleaned, a coating solution is applied to the surface of the glass by the roller coating process, and then curing and toughening treatment are carried out. Because the coating solution is water-based or organic solvent-based liquid, before the roller coating process, the coating solution is influenced by water vapor and a water film existing on the surface of the cleaned glass, and the adhesive force between the film and the glass is influenced after coating. After the roller coating process, the influence of nonuniform volatilization of the solution, difficult volatilization of the aqueous solution, easy absorption of water in air by the solution and the like can affect the uniformity of the film layer to generate stripe defects on the film surface, and can also cause the reduction of the light transmittance and the weather resistance of the coated glass.

In the traditional method, an axial flow fan or a fan is adopted to blow the surface of the glass before and after film coating, so as to achieve the effects of cooling the glass and accelerating the volatilization of the solvent. The axial flow fan is generally used for accelerating the volatilization of the solution and achieving the leveling effect of the solution, but the mode has higher requirements on the temperature and the humidity of the environment, the temperature and the moisture content of the air blowing can not be effectively and accurately controlled, and only the solvent can be cooled and volatilized with acceleration. And the fan blows unevenly, and eddy current is easy to generate, so that the film surface generates stripes, and the appearance and performance of the produced product fluctuate greatly.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the preheating method for producing the coated glass, the preheating method is simple to operate, convenient to control, high in production efficiency and low in production cost, and the initial temperature of a glass substrate, the temperature of a coating liquid and the temperature of a wet film are respectively increased and the uniformity of the volatilization rate of a solvent in a wet film state is accelerated by a preheating mode; meanwhile, the influence of water vapor and water films on the surface of the cleaned glass substrate before the roller coating process can be avoided, other media between the film layer and the glass substrate are eliminated, the adhesive force between the film layer and the glass substrate is improved, and the light transmittance, the weather resistance and the hardness of the film layer are improved; and energy consumption of subsequent curing procedures is saved.

The preheating device is novel in structure, can respectively heat the glass substrate, the coating liquid and the coated glass in different work sections on the basis of ensuring the continuity of the working procedures and the production efficiency of a production line, is favorable for improving the binding force of a film layer and a glass substrate, reducing the microcracks of the film layer and improving the hardness and the weather resistance of the film layer.

The purpose of the invention is realized by the following technical scheme: a preheating method for coated glass production comprises the following steps:

step S1, preheating the glass substrate: blowing hot air to the surface of the glass substrate until the temperature of the glass substrate is 40-60 ℃;

step S2, preheating the coating liquid: heating the coating liquid to 30-40 ℃, and then coating the preheated coating liquid on the surface of the glass substrate preheated in the step S1 to obtain a glass substrate coated with the coating liquid;

step S3, post-heating treatment: and (4) blowing hot air to the glass substrate coated with the coating liquid in the step S2 to make the temperature of the glass substrate reach 50-70 ℃, and preparing preheated coated glass for later use and curing.

In the processing and production process of the coated glass, the initial temperature of the glass substrate, the temperature of the coating liquid and the blowing of the wet film are respectively improved in a preheating mode, the volatilization rate uniformity of the solvent in the wet film state is accelerated, and the apparent quality problems of water absorption, fogging, thickness uniformity and the like of the film layer are solved; meanwhile, the influence of water vapor and water films on the surface of the cleaned glass substrate before the roller coating process can be avoided, other media between the film layer and the glass substrate are eliminated, the adhesive force between the film layer and the glass substrate is improved, and the light transmittance, the weather resistance and the hardness of the film layer are improved; through preheating treatment, the later stage curing process can further reduce curing temperature and curing oven length, has apparent effect to production process energy saving and consumption reduction.

In the step S1, the surface of the glass substrate is blown by hot air to remove the surface aqueous medium, and the temperature of the glass substrate is raised to 40-50 ℃ by hot air, so that the solvent in the coated wet film volatilizes under the action of the preheated glass substrate and volatilizes upwards from the bottom of the film layer according to the heat transfer effect, thereby improving the curing effect of the film layer, eliminating micro bubbles in the film layer, facilitating the improvement of the binding force between the film layer and the glass substrate, reducing microcracks in the film layer, and improving the hardness and weather resistance of the film layer.

And step S2 is to preheat the coating liquid, so as to reduce the influence caused by the temperature difference between the coating liquid and the surface of the heated glass substrate, and the coating liquid is kept in a constant temperature and stirring state after being heated, so that certain activity of the coating liquid can be kept, the adhesive force between the coating liquid and the surface of the glass substrate is improved, and the formed film layer is more stable.

Preferably, in step S1, a first hot air device is used to blow and shower the surface of the glass substrate; and step S3, performing blowing spraying on the glass substrate coated with the coating liquid by adopting a second hot air device.

The first hot air device and the second hot air device preferably adopt the same hot air device, and both comprise a hot air blower, a high-temperature ventilation pipe and a high-temperature air knife, the hot air blower blows air into the air, the built-in heating wires generate heat after being electrified and exchange heat with the air so as to heat the air to a set temperature, the heated hot air is circulated to the high-temperature air knife through the high-temperature ventilation pipe, the hot air is blown out at a high speed by airflow slices through the high-temperature air knife, the airflow is uniform and constant, the glass substrate can be uniformly heated, and the phenomenon that the temperature of the glass substrate is unbalanced due to unbalanced heating is avoided.

Preferably, in step S2, the coating solution is heated, kept warm, and stirred by a heating constant temperature stirring device, and the coating solution is delivered to the coating equipment through a liquid supply pipe and a liquid supply pump to coat the surface of the glass substrate.

The coating liquid is heated, kept warm and stirred by the heating constant-temperature stirring device, so that the heated coating liquid keeps certain activity and stable performance, then the coating liquid is pumped to the liquid supply pipe by the liquid supply pump and is further conveyed to the coating equipment by the liquid supply pipe, and the coating liquid is coated on the surface of the glass substrate to be subjected to coating treatment. More preferably, the liquid supply pump is a peristaltic pump, and the rotation speed of the liquid supply pump is 80-150 rpm. Specifically, the rotation speed of the liquid feed pump is 80rpm, 100rpm, 120rpm, 130rpm or 150 rpm.

Further, in step S2, a diluent reservoir, a diluent output pump, and another heating constant temperature stirring device are further provided, and the heating constant temperature stirring device is also loaded with the coating solution, and heats, keeps warm, and stirs the coating solution, and supplements the coating solution to the heating constant temperature stirring device as a supply place, and simultaneously dilutes the coating solution through the diluent in the diluent reservoir, and timely supplies the coating solution to ensure continuous supply of the coating solution.

Preferably, the step S2 includes a step of processing by using a backflow mechanism, the backflow mechanism includes a negative pressure liquid suction device, a filter and a backflow pipe which are connected in sequence, the negative pressure liquid suction device sucks excess coating liquid flowing out in the coating liquid coating process, a liquid inlet end of the backflow pipe is communicated with the negative pressure liquid suction device, and a liquid outlet end of the backflow pipe is communicated with the heating constant temperature stirring device.

According to the invention, a heating solution circulating liquid supply mode is adopted in the film coating process through the backflow mechanism, so that the waste of the film coating liquid is reduced, the environmental pollution is reduced, the redundant film coating liquid flows back to the heating constant-temperature stirring device, the preheating and heat preservation temperature of the film coating liquid is kept, the solution on the roller coating is kept fresh, the concentration is consistent, and the activity is stable. Wherein the negative pressure liquid sucker is the existing negative pressure liquid sucker in the field, and the redundant coating liquid is absorbed into the return pipe through negative pressure and then flows back to the heating constant temperature stirring device.

The other purpose of the invention is realized by the following technical scheme: the preheating equipment applied to the preheating method for producing the coated glass comprises a glass substrate preheating device, a preheating coating device and a coating post-heating device which are sequentially connected according to the using sequence; the glass substrate preheating device comprises a first hot air device and a first conveying belt; the preheating coating device comprises coating equipment, a heating constant-temperature stirring device, a liquid supply pipe, a liquid supply pump and a second conveying belt; the heating device after coating comprises a second hot air device and a third conveying belt;

the first conveying belt bears and conveys the glass substrate to a second conveying belt, and the second conveying belt bears and conveys the glass substrate to a third conveying belt; the first hot air device blows and sprays the glass substrate to preheat, the heating constant-temperature stirring device heats, keeps warm and stirs the coating liquid, the liquid supply pump pumps the coating liquid which is heated and preheated in the heating constant-temperature stirring device to the liquid supply pipe and supplies the coating liquid to the coating equipment, and the coating device coats the coating liquid on the surface of the glass substrate; and the second hot air device blows and sprays the glass substrate coated with the coating liquid.

According to the preheating equipment, in the processing and production process of the coated glass, the glass substrate is respectively preheated, the coating liquid is preheated, and the glass substrate coated with the coating liquid is heated and blown, so that the solvent volatilization rate uniformity of the coating liquid in a wet film state is accelerated, and the apparent quality problems of water absorption, fogging, thickness uniformity and the like of a film layer are solved; meanwhile, the influence of water vapor and water films on the surface of the cleaned glass substrate before the roller coating process can be avoided, other media between the film layer and the glass substrate are eliminated, the adhesive force between the film layer and the glass substrate is improved, and the light transmittance, the weather resistance and the hardness of the film layer are improved; through preheating treatment, the later stage curing process can further reduce curing temperature and curing oven length, has apparent effect to production process energy saving and consumption reduction.

The glass substrate preheating device is used for carrying out preheating treatment on a glass substrate; specifically, the first conveying belt bears and conveys the glass substrate to the second conveying belt, so that the continuity and the production efficiency of the working procedure are ensured; the first hot air device blows and sprays the glass substrate to achieve a preheating effect, so that the temperature of the glass substrate reaches 40-50 ℃, the solvent in the coated wet film volatilizes from the bottom to the top, the curing effect of the film layer is improved, micro bubbles in the film layer are eliminated, the bonding force between the film layer and the glass substrate is improved, micro cracks of the film layer are reduced, and the hardness and the weather resistance of the film layer are improved.

The preheating coating device preheats the coating liquid, and particularly, the second conveying belt bears and conveys the glass substrate to the third conveying belt, so that the continuity and the production efficiency of the working procedure are ensured; the heating constant-temperature stirring device heats, keeps warm and stirs the coating liquid, so that the heated coating liquid is kept in a constant-temperature and stirring state to ensure that the coating liquid keeps certain activity and improve the adhesive force between the coating liquid and the surface of the glass substrate; and the liquid supply pump pumps the preheated coating liquid in the heating constant-temperature stirring device to the liquid supply pipe and supplies the preheated coating liquid to the coating equipment, and the preheated coating liquid is coated on the surface of the glass substrate through the coating equipment, so that the influence of adhesive force caused by the temperature difference between the coating liquid and the surface of the heated glass substrate is reduced, and the formed film layer is more stable. Preferably, the liquid supply pump is a peristaltic pump, and the rotation speed of the liquid supply pump is 80-150 rpm. Specifically, the rotation speed of the liquid feed pump is 80rpm, 100rpm, 120rpm, 130rpm or 150 rpm.

The post-coating heating device is used for heating the glass substrate coated with the coating liquid, and specifically, the third conveying belt bears and conveys preheated coating glass to a subsequent curing device; the second hot air device blows and sprays the surface of the film layer to achieve the effect of heating and temperature rise, so that the temperature of the glass substrate reaches 50-70 ℃, the coating liquid is volatilized quickly and uniformly, the mutual adhesive force between the film layer and the glass substrate is improved, the uniformity of the film layer is improved, and the light transmittance, the weather resistance and the hardness of the film layer are improved.

Preferably, the first hot air device comprises a first air heater, a plurality of first high-temperature ventilation pipes and a plurality of first high-temperature air knives, the air inlet end of each first high-temperature ventilation pipe is communicated with the air outlet end of the first air heater, and the air outlet end of each first high-temperature ventilation pipe is communicated with the air inlet end of one first high-temperature air knife; the air inlet end of the first air heater is provided with air filter cotton; the setting temperature of the first air heater is 100-150 ℃; the included angle between the air outlet end of each first high-temperature air knife and the surface of the glass substrate is 40-90 degrees.

The first air heater is an air heater in the field, an electric heating wire and an air blowing mechanism are arranged in the air heater, after the air heater is electrified, the air blowing mechanism blows and sucks external air, the electric heating wire is electrified to generate heat, the heat exchange is further carried out between the electric heating wire and the external air sucked by the air blowing, the air is heated to be stable in a set state, the heated hot air flows to a first high-temperature air knife through a first high-temperature ventilation pipe, the hot air is blown out at a high speed through an air flow sheet by the first high-temperature air knife, the air flow is uniform and constant, the glass substrate can be uniformly heated, and the phenomenon that the temperature of the glass substrate is unbalanced due to unbalanced.

Wherein, the first air heater air inlet end of blast air process sets up the filtration cotton, and this filtration cotton is the common filtration cotton in this field, and granule, dust in the outside air when inhaling the blast air are filtered, avoid dust and tiny granule to blow through first high temperature air knife and drench to the glass substrate surface, lead to the glass substrate surface to fall there are impurity such as granule, dust, influence the adsorption stability between follow-up coating film liquid and the glass substrate to influence coated glass's luminousness.

And the contained angle between the air-out end that sets up first high temperature wind sword and the glass substrate surface is 40-90, enables hot-air to blow and drench the glass substrate surface with the angle of slope to the part that makes the glass substrate be close to the air-out end can be heated, and the part that is located around the air-out end can receive preheating, improves the heating homogeneity of glass substrate.

Specifically, the setting temperature of the first air heater is 100 ℃, 110 ℃, 120 ℃, 130 ℃ or 150 ℃; the included angle between the air outlet end of the first high-temperature air knife and the surface of the glass substrate is 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees or 90 degrees.

Preferably, the heating constant-temperature stirring device comprises a first liquid storage device and a first heating constant-temperature stirrer, the first heating constant-temperature stirrer heats, keeps warm and stirs the first liquid storage device, the coating equipment comprises a coating roller and a liquid tank, the liquid inlet end of the liquid supply pipe is communicated with the first liquid storage device, the liquid outlet end of the liquid supply pipe is communicated with the liquid tank, and the liquid supply pump is arranged in the middle of the liquid supply pipe; the temperature of the first heating constant-temperature stirrer is set to be 30-40 ℃, and the stirring speed is 600-1200 rpm.

The first liquid storage device is a container for loading the coating liquid, the first heating constant-temperature stirrer is used for heating, insulating and stirring the first liquid storage device, and the heating and insulating temperature and the stirring speed are strictly controlled, so that the coating liquid heated by heating keeps certain activity, has stable performance, can be stably attached to a preheated glass substrate, and improves the adhesive force between the glass substrate and the preheated glass substrate; the coating liquid is pumped to the liquid supply pipe by the liquid supply pump, and then is conveyed to a liquid tank of the coating equipment through the liquid supply pipe, and the coating liquid is coated to the surface of the glass substrate by the coating roller on the liquid tank. Specifically, the temperature of the first heating thermostat stirrer is set to 30 ℃, 32 ℃, 35 ℃, 38 ℃ or 40 ℃, and the stirring speed is 600rpm, 800rpm, 900rpm, 1000rpm or 1200 rpm.

Preferably, the heating constant-temperature stirring device further comprises a backflow mechanism, the backflow mechanism comprises a negative pressure liquid suction device, a filter and a backflow pipe which are sequentially connected, the negative pressure liquid suction device sucks redundant coating liquid flowing out in the coating liquid coating process, a liquid inlet end of the backflow pipe is communicated with the negative pressure liquid suction device, and a liquid outlet end of the backflow pipe is communicated with the first liquid storage device.

According to the invention, the backflow mechanism is arranged, so that redundant coating liquid flows back to the first liquid storage device, the preheating and heat preservation temperature of the recovered coating liquid is continuously maintained, the concentration of the coating liquid is kept consistent, the activity is stable, the coating liquid operates in a heating solution circulating liquid supply mode in the coating process, the waste of the coating liquid is reduced, and the environmental pollution is reduced. The negative pressure liquid suction device is the existing negative pressure liquid suction device in the field, and the redundant coating liquid is absorbed into the return pipe through negative pressure so as to return to the first liquid storage device; the filter can filter the coating liquid recovered by negative pressure, isolate external particles and dust adhered in the coating liquid flowing back, and prevent the coating liquid adhered with the particles and dust from flowing back to the first liquid storage device to pollute the rest coating liquid, so that the adhesive force between the coating liquid and the glass substrate coated subsequently is influenced, and the light transmittance of the coating layer is influenced.

Preferably, the heating constant-temperature stirring device further comprises a second liquid storage device, a second heating constant-temperature stirrer, an infusion pump and an infusion tube, wherein the second heating constant-temperature stirrer heats, keeps warm and stirs the second liquid storage device, a liquid inlet end of the infusion tube is communicated with the second liquid storage device, a liquid outlet end of the infusion tube is communicated with the first liquid storage device, and the infusion pump is arranged in the middle of the infusion tube; the temperature of the second heating constant-temperature stirrer is set to be 30-40 ℃, and the stirring speed is 600-1200 rpm.

The second reservoir is also a container for loading the coating liquid, the second heating constant-temperature stirrer heats, keeps warm and stirs the second reservoir, the coating liquid in the second reservoir is pumped to the infusion tube through the infusion pump and then is conveyed to the first reservoir through the infusion tube to supplement and supply the coating liquid in the first reservoir, meanwhile, the temperature of the second heating constant-temperature stirrer is strictly controlled, the coating liquid in the second reservoir can be heated to 30-40 ℃, the temperature of the coating liquid in the second reservoir is the same as that of the coating liquid in the first reservoir, the temperature difference between the coating liquid in the second reservoir and the coating liquid in the first reservoir is avoided, the temperature of the coating liquid conveyed to the coating equipment is ensured to be constant, and the coating liquid is ensured to keep certain activity so as to ensure the adhesive force between the coating liquid layer and the glass substrate. Wherein, the infusion pump is preferably a peristaltic pump, and the rotation speed of the infusion pump is 10-30 rpm. Specifically, the temperature of the second heating constant temperature stirrer is set to 30, 32 ℃, 35 ℃, 38 ℃ or 40 ℃, the stirring speed is 600rpm, 800rpm, 900rpm, 1000rpm or 1200rpm, and the rotation speed of the infusion pump is 10rpm, 15rpm, 20rpm, 25rpm or 30 rpm.

In addition, the heating constant-temperature stirring device is further provided with a dilution mechanism, the dilution mechanism comprises a diluent liquid storage device, a diluent liquid pump and a diluent liquid pipe, the diluent liquid storage device is used for loading diluent of the coating liquid, the diluent liquid pump is used for pumping the diluent from the diluent liquid storage device to the diluent liquid pipe, the liquid inlet end of the diluent liquid pipe is communicated with the diluent liquid storage device, and the liquid outlet end of the diluent liquid pipe is communicated with the first liquid storage device. Because first reservoir and second reservoir are continuous constant temperature stirring state, the solvent of the coating liquid in the reservoir can volatilize, lead to the concentration increase of coating liquid then, viscosity increases, influence the leveling of coating liquid on glass substrate surface, therefore through adding the diluent past first reservoir to the concentration and the viscosity of allotment coating liquid, keep the concentration of coating liquid unanimous, guarantee that the coating liquid who carries to the coating equipment has better activity and leveling, easily at glass substrate surface coating, shaping. Preferably, the diluent pump is a peristaltic pump, and the rotation speed of the diluent pump is 2-20 rpm. Specifically, the rotation speed of the diluent pump is 2rpm, 5rpm, 10rpm, 15rpm, or 20 rpm.

Preferably, the second hot air device comprises a second hot air blower, a plurality of second high-temperature ventilation pipes and a plurality of second high-temperature air knives, the air inlet end of each second high-temperature ventilation pipe is communicated with the air outlet end of the second fan, and the air outlet end of each second high-temperature ventilation pipe is communicated with the air inlet end of one second high-temperature air knife; the air inlet end of the second air heater is provided with air filter cotton; the setting temperature of the second air heater is 200-300 ℃; the included angle between the air outlet end of each second high-temperature air knife and the surface of the glass substrate is 40-90 degrees.

The second air heater is the same as the first air heater in principle and structure, an electric heating wire and an air blowing mechanism are arranged in the second air heater, after the second air heater is electrified, the air blowing mechanism blows air from outside and sucks the air, the electric heating wire generates heat through electrification, then the heat exchange is carried out between the electric heating wire and the air sucked by the air blowing, the air is heated to be stable in a set state, the heated hot air is communicated to a second high-temperature air knife through a second high-temperature ventilation pipe, the hot air is blown out at a high speed through an air flow slice through the second high-temperature air knife, the air flow is uniform and constant, a glass substrate coated with the coating liquid can be uniformly heated to 50-70 ℃, the phenomenon of unbalanced glass substrate temperature caused by unbalanced heating is avoided, and the uniform volatilization of a solvent or an aqueous solution in the coating.

Wherein, the air inlet end of the second air heater of blast air process sets up the filtration cotton, and this filtration cotton is the common filtration cotton in this field, and granule, dust in the outside air when inhaling the blast air are filtered, avoid dust and tiny granule to blow through second high temperature air knife and drench to the rete surface, lead to coated glass surface to fall to have impurity such as granule, dust, influence coated glass's luminousness and subassembly photovoltaic efficiency.

And the included angle between the air outlet end provided with the second high-temperature air knife and the surface of the glass substrate is 40-90 degrees, so that hot air can be blown and sprayed on the surface of the glass substrate at an inclined angle, the part of the glass substrate and the part of the film layer, which is close to the air outlet end, can be heated, the part around the air outlet end can be preheated, the heating uniformity of the glass substrate and the film layer is improved, and the solvent or the aqueous solution in the coating liquid is promoted to be heated and uniformly volatilized. Specifically, the setting temperature of the second air heater is 200 ℃, 220 ℃, 250 ℃, 280 ℃ or 300 ℃; the included angle between the air outlet end of each second high-temperature air knife and the surface of the glass substrate is 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees or 90 degrees.

The invention has the beneficial effects that: the preheating method disclosed by the invention is simple to operate, convenient to control, high in production efficiency and low in production cost, and during the processing and production processes of the coated glass, the initial temperature of the glass substrate, the temperature of the coating liquid and the heat input blowing of the wet film are respectively improved in a preheating mode, so that the volatilization rate uniformity of the solvent in the wet film state is accelerated, and the apparent quality problems of water absorption, fogging, thickness uniformity and the like of the film layer are solved; meanwhile, the influence of water vapor and water films on the surface of the cleaned glass substrate before the roller coating process can be avoided, other media between the film layer and the glass substrate are eliminated, the adhesive force between the film layer and the glass substrate is improved, and the light transmittance, the weather resistance and the hardness of the film layer are improved; through preheating treatment, the later stage curing process can further reduce curing temperature and curing oven length, has apparent effect to production process energy saving and consumption reduction.

The preheating device disclosed by the invention is novel in structure, and can be used for respectively heating the glass substrate, the coating liquid and the coated glass in different sections on the basis of ensuring the continuity of the working procedures and the production efficiency of a production line, so that the coating liquid volatilizes from the bottom to the top in a wet film according to the heat transfer effect, the curing effect of the film layer is improved, micro bubbles in the film layer are eliminated, the bonding force between the film layer and the glass substrate is favorably improved, the micro cracks of the film layer are reduced, and the hardness and the weather resistance of the film layer are improved.

Drawings

FIG. 1 is a process flow diagram for preparing a coated glass product according to examples 1-5 of the present invention;

FIG. 2 is a schematic view of the preheating apparatus according to the present invention;

FIG. 3 is a flowchart of a process for producing a coated glass product according to comparative example 1 of the present invention;

FIG. 4 is a graph of light transmittance of coated glass prepared from the solvent-based coating solution of the present invention;

FIG. 5 is a graph of light transmittance of coated glass prepared from the aqueous coating solution of the present invention;

the reference signs are: 1-glass substrate preheating device, 111-first hot air blower, 112-first high temperature ventilation pipe, 113-first high temperature air knife, 12-first transmission belt, 2-preheating coating device, 21-coating equipment, 211-coating roller, 212-liquid tank, 221-first reservoir, 222-first heating constant temperature stirrer, 23-liquid supply pipe, 24-liquid supply pump, 25-second transmission belt, 261-negative pressure liquid suction device, 262-filter, 263-return pipe, 271-second reservoir, 272-second heating constant temperature stirrer, 273-liquid transfer pump, 274-liquid transfer pipe, 281-diluent reservoir, 282-diluent pump, 283-diluent pipe, 3-coating post-heating device, 311-second hot air blower, 312-second high temperature ventilation pipe, 313-second high temperature air knife, 32-third transmission belt, 10-glass substrate.

Detailed description of the invention

For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and accompanying fig. 1-5, which are not intended to limit the present invention.