Solvent removal method for light-transmitting composite board with laminated inner layer

Abstract

The invention relates to a method for removing a solvent in jelly, in particular to a method for removing a solvent for a light-transmitting composite board with a laminated inner layer. The solvent removal method for the light-transmitting composite board with the inner layer being laminated comprises the following steps that S1, the light-transmitting composite board is placed in a sealed container, the sealed container is provided with an air port used for being connected with an exhaust pipe, and the air port of the sealed container is connected with an air extractor through the exhaust pipe; s2, the sealed container is subjected to air exhaust so that an inner cavity of the sealed container can reach a low-vacuum state; s3, the sealed container is transferred into a heating device, heating treatment is conducted through the heating device, and low vacuum of an inner cavity of the sealed container is kept in the heating process; and S4, after air exhaust and heating are stopped, the sealed container is taken out of the heating device, and the light-transmitting composite board located in the sealed container is taken out. The method has the advantages of being capable of removing solvents and bubbles in the adhesive layer of the transparent composite board and eliminating surface water ripples so as to guarantee the optical effect.

Description

Technical Field

[0001] The invention relates to a method for removing solvent from a colloid, in particular to a method for removing solvent from a light-transmitting composite board with an inner layer of glue. Background Art

[0002] In order to reduce the rheological properties of the colloid and improve the fixing effect, the colloid will be heated or vacuumed. However, the heating and vacuuming methods are mainly suitable for colloids in open systems, but are not very effective for colloids in closed or semi-closed systems. For example, the treatment effect on the inner layer of the translucent composite board is poor.

[0003] The high-viscosity colloids in the inner interlayer of translucent composite panels are prone to forming bubbles during handling, pouring, and molding. This is especially true for colloids containing volatile solvents, which are particularly prone to bubbles when heated. Traditional bubble removal methods, such as static standing, ultrasonic vibration, centrifugal sedimentation, and vacuuming, are not ideal in closed systems. Furthermore, vacuuming can easily cause ripples to form between the interlayer and the outer translucent panel, affecting the optical quality. Summary of the Invention

[0004] The object of the present invention is to provide a method for removing solvents from inner-layer laminated light-transmitting composite panels, which has better volatile solvent removal effect, can remove bubbles and eliminate water ripples as much as possible, and thus achieve better optical effects.

[0005] To achieve the above object, the present invention adopts a method for removing solvent from a light-transmitting composite panel with an inner layer of glue, comprising the following steps: S1. The light-transmitting composite plate is placed in a sealed container, the sealed container having a gas port for connecting to the exhaust pipe, so that the gas port of the sealed container is connected to the exhaust pipe through the exhaust machine; S2. The sealed container is evacuated so that the inner cavity of the sealed container reaches a low vacuum state; S3. The sealed container is transferred to a heating device, and the heating device is heated to maintain a low vacuum in the inner cavity of the sealed container during the heating process; S4. After stopping the vacuuming and heating, the sealed container is removed from the heating device, and the light-transmitting composite board in the sealed container is removed.

[0006] The light-transmitting composite panel is placed in a sealed container, connected to an exhaust pump to maintain a low vacuum within the space containing the light-transmitting composite panel. The sealed container containing the light-transmitting composite panel is then heated in an existing heating device (oven or autoclave) to remove solvent from the interlayer of the light-transmitting composite panel, ensuring effective removal of volatile solvents to meet product requirements. This invention combines vacuuming and heating within a closed system to effectively remove solvent and bubbles from the interlayer of the composite panel, while avoiding the problem of water ripples caused by vacuuming and maintaining the optical quality of the light-transmitting composite panel. Furthermore, this invention improves processing efficiency and ensures product quality.

[0007] Preferably, in step S3, the sealed container is first heated for a first set time and at a first set temperature. After stopping the vacuuming and heating, the sealed container is removed from the heating device, the light-transmitting composite panel is removed from the sealed container, and the light-transmitting composite panel is placed in the heating device and heated to a set pressure before being heated for a second set time and at a second set temperature. This two-stage heating process allows for better control of the removal process, potentially improving removal efficiency and the quality of the final product.

[0008] Preferably, in step S3, after taking out the light-transmitting composite plate from the sealed container, the light-transmitting composite plate is turned upside down and then placed in a heating device for pressurized heating.

[0009] This ensures uniform heating across the interlayer, helping to eliminate water rippling and improve product quality. The adhesive's rheological properties allow it to become uniform under the action of gravity and pressure after flipping, further eliminating water rippling. Furthermore, after flipping, the water rippling is relatively located on the bottom side, and the volatile gases released by heating migrate upward, further facilitating its removal.

[0010] Preferably, in step S1, an air guide net is provided in the inner cavity of the sealed container, an end surface of the air guide net is closer to the air port than an end surface of the light-transmitting composite plate, and the air guide net covers the light-transmitting composite plate.

[0011] Setting up an air guide net can improve the exhaust efficiency, avoid direct contact between the surface of the composite plate and the inner surface of the sealed container, and create a gap between the surface of the composite plate and the inner surface of the sealed container, ensuring uniform gas flow, avoiding local vacuum deficiency, and improving the bubble removal effect.

[0012] Preferably, the air guide net is coated on the outside of the light-transmitting composite board.

[0013] Preferably, the air guide net is a flexible mesh structure. The above arrangement facilitates the air guide net to wrap the composite board.

[0014] Preferably, the sealed container is made of a flexible material and comprises a first part and a second part arranged opposite to each other, the first part and the second part being assembled to form the sealed container having an inner cavity; a positioning protrusion and a positioning groove which cooperate with each other are provided between the edge of the first part and the edge of the second part.

[0015] The sealed container is divided into two parts, which are assembled to form a complete container with an inner cavity, so as to facilitate the placement and removal of larger plate-shaped light-transmitting composite panels. In particular, since the sealed container is equipped with a vacuum pump for vacuuming, the seal between the first part and the second part does not require complete sealing. The first part and the second part can be compressed to improve the sealing effect. The connection and fixation are achieved by the tight fit between the positioning protrusions and the positioning grooves at the edges. The connection and fixation effect can be ensured by pressing a heavy object at the outer edge. In particular, the sealed container of the present invention is made of a flexible material. When the air in the sealed container is evacuated, the inner wall of the sealed container will move toward the light-transmitting composite panel due to the influence of air pressure. The sealed container of the present invention can be made of materials such as rubber silicone and can be made into a bag or box shape.

[0016] Preferably, in step S2, the vacuum degree of the inner cavity of the sealed container is set to a low vacuum state of -0.09 to -0.05 MPa.

[0017] Preferably, in step S3, the first set temperature is 80°C to 130°C, the first set duration is 5 to 48 hours, and after heating for the first set duration, the material is cooled to room temperature. After cooling, the vacuuming is stopped. This optimizes the bubble removal process and prevents damage to the interlayer structure caused by excessive vacuuming. Precisely controlling the heating temperature and duration ensures the effective removal of volatile solvents from the interlayer while preventing degradation of material properties caused by excessive heating.

[0018] Preferably, in step S3, the pressure is set to 0.5~5MPA, the second set temperature is 60℃~100℃, and the second set time is 5~24 hours. By controlling the pressure and temperature during simultaneous pressurization and heating, the water ripples in the interlayer can be further eliminated, and the flatness and appearance quality of the product can be improved. The invention has the advantages of being able to remove solvents and bubbles in the interlayer of the transparent composite plate and also being able to eliminate surface water ripples to ensure optical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the interlayer of the present invention when it is in a sealed container. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 This embodiment discloses a method for removing solvent from a light-transmitting composite panel with an inner layer of laminated plastic, comprising the following steps: S1. Place the light-transmitting composite panel 1 on the Figure 1 In the sealed container 2 shown, the sealed container 2 is placed on a support plate 5, and an air guide net 3 is wrapped around the outer surface of the light-transmitting composite plate 1. The sealed container 2 is provided with an air port for connecting to an air extraction pipe 4, so that the air port of the sealed container 2 is connected to an air extractor through the air extraction pipe 4; the end surface of the air guide net 3 is closer to the air port than the end surface of the light-transmitting composite plate 1, and the air guide net 3 has a flexible mesh structure; S2. The sealed container 2 is evacuated so that the inner cavity of the sealed container 2 reaches a low vacuum state of -0.09 to -0.05MPa; S3. The sealed container 2 is transferred to a heating device, and the heating device is heated to maintain a low vacuum in the inner cavity of the sealed container during the heating process; S4. After stopping the vacuuming and heating, the sealed container 2 is removed from the heating device, and the light-transmitting composite plate in the sealed container is removed.

[0022] The outer layer of the light-transmitting composite panel 1 of this embodiment is made of glass, measuring 1500mm x 2000mm x 5mm. The interlayer 102 of the light-transmitting composite panel 1 is made of rubber, measuring 1500mm x 2000mm x 15mm, and having a moisture content of 21.5%. The sealed container 2 of this embodiment is made of a flexible material and includes a first portion 22 located at the bottom and a second portion 21 located at the top. The first portion 22 and the second portion 21 are assembled to form the sealed container with an inner cavity. The first portion 22 and the second portion 21 of the sealed container 2 of this embodiment each have an extension extending outward. The extension of the first portion 22 and the extension of the second portion 21 are provided with mutually cooperating positioning protrusions 20 and positioning grooves. The sealed container 2 of this embodiment is made of rubber. A support plate 5 is provided to ensure that the bottom of the sealed container 2 remains flat during heating and degassing.

[0023] Example 2 Based on Example 1, the sealed container is first heated for a first set time and at a first set temperature. After stopping the vacuuming and heating, the sealed container is removed from the heating device. The light-transmitting composite panel is removed from the sealed container, turned upside down, and then placed in the heating device again. After heating to a set pressure, the light-transmitting composite panel is heated for a second set time and at a second set temperature. The heating device in this embodiment is an oven.

[0024] The first set time is 5 hours, the first set temperature is 80°C, and the second set time is 48 hours, the second set temperature is 60°C. That is, the temperature of the heating device in Example 1 is set to 80°C, the vacuum degree of the exhaust is set to -0.09 MPa, and in step S3, the heating and exhaust are cooled to room temperature after 5 hours, and the exhaust is then stopped; then the light-transmitting composite panel 1 is removed and turned upside down, that is, after being turned over, it is placed in the heating device again, and heated at the second set temperature of 60°C under normal pressure for the second set time of 48 hours. After the heating is completed, the room temperature is naturally cooled.

[0025] After being treated by the method of this embodiment, the water content of the interlayer 102 of the light-transmitting composite panel 1 is 14.9%, and no bubbles or water ripples are found.

[0026] Example 3 The heating device of this embodiment includes an oven and an autoclave, and the light-transmitting composite board 1 is heated in the oven and the autoclave in sequence.

[0027] The oven is first set to a temperature of 130°C and a vacuum of -0.05 MPa. After heating in the oven for a first set time of 48 hours and cooling to room temperature, the vacuum is stopped. The light-transmitting composite panel 1 is then removed and flipped upside down, i.e., placed in an autoclave. The panel is then heated at a second set temperature of 80°C under normal pressure for a second set time of 10 hours. After heating, the panel is allowed to cool naturally to room temperature. Whether or not to vacuum the sealed container 2 in the autoclave is determined based on actual needs.

[0028] After being treated by the method of this embodiment, the water content of the interlayer 102 of the light-transmitting composite panel 1 is 11.3%, and no bubbles or water ripples are found.

[0029] Example 4 The heating device of this embodiment includes an oven and an autoclave, and the light-transmitting composite board 1 is heated in the oven and the autoclave in sequence.

[0030] The first set temperature of the oven is 90°C, and the vacuum degree of the exhaust is set to -0.08 MPa. After heating in the oven for the first set time of 36 hours, it is cooled to room temperature and the exhaust is stopped. The light-transmitting composite board 1 is then taken out of the oven and turned upside down, that is, placed in an autoclave after being turned over and pressurized to 0.5 MPa. It is heated at a second set temperature of 80°C and a second set time of 5 hours. After the heating is completed, the room temperature is naturally cooled.

[0031] After being treated by the method of this embodiment, the water content of the interlayer 102 of the light-transmitting composite panel 1 is 14.1%, and no bubbles or water ripples are found.

[0032] Example 5 The heating device of this embodiment includes an oven and an autoclave, and the light-transmitting composite board 1 is heated in the oven and the autoclave in sequence.

[0033] The first set temperature of the oven is set to 110°C, and the vacuum degree of the exhaust is set to -0.08MPa. After heating in the oven for the first set time of 12 hours, it is cooled to room temperature and the exhaust is stopped. The light-transmitting composite board 1 is taken out of the oven and turned upside down, that is, it is placed in an autoclave after being turned over and pressurized to 5MPa. It is heated at a second set temperature of 100°C and a second set time of 12 hours. After the heating is completed, the room temperature is naturally cooled.

[0034] After being treated by the method of this embodiment, the water content of the interlayer 102 of the light-transmitting composite panel 1 is 12.8%, and no bubbles or water ripples are found.

[0035] Example 6 The heating device of this embodiment includes an oven and an autoclave, and the light-transmitting composite board 1 is heated in the oven and the autoclave in sequence.

[0036] The first set temperature of the oven is set to 100°C, the vacuum degree of the exhaust is set to -0.08MPa, and after heating in the oven for the first set time of 24 hours, it is cooled to room temperature and the exhaust is stopped; the light-transmitting composite board 1 is taken out of the oven and turned upside down, that is, after turning it over, it is placed in an autoclave and pressurized to 3MPa. It is heated at a second set temperature of 60°C and a second set time of 24 hours. After the heating is completed, the room temperature is naturally cooled.

[0037] After being treated by the method of this embodiment, the water content of the interlayer 102 of the light-transmitting composite panel 1 is 13.4%, and no bubbles or water ripples are found.

[0038] The data of Examples 2 to 6 are summarized in the following table: Example Vacuum oven temperature / ℃ Vacuum degree / MPa Heating and exhaust time / hour Dewatering corrugated autoclave pressure / MPa Dewatering ripple heating temperature / ℃ Dewatering ripple heating time / hour Moisture content of interlayer after treatment / % Are there bubbles? Are there water ripples? Example 2 80 -0.09 5 Normal pressure 60 48 14.9 no no Example 3 130 -0.05 48 Normal pressure 80 10 11.3 no no Example 4 90 -0.08 36 0.5 80 5 14.1 no no Example 5 110 -0.08 12 5 100 12 12.8 no no Example 6 100 -0.08 24 3 60 24 13.4 no no In this embodiment, the method for making a light-transmitting composite board with an inner layer of glue is as follows: a light-transmitting board that is not airtight is laid flat, and then a glue board that is formed and of corresponding size as an interlayer is placed on the light-transmitting board, and then another light-transmitting board is covered on the interlayer to form a composite board of "light-transmitting board + glue board + light-transmitting board" stacked up and down; or a glue-like substance is applied layer by layer on a light-transmitting board by any existing method to directly form an interlayer on the light-transmitting board, and then another light-transmitting board is covered on the interlayer, and the light-transmitting composite board is obtained after flattening. Among them, the light-transmitting board in the embodiment of the present invention is treated to be airtight on the surface or is made of airtight material, which can prevent gas from entering the glue board through the light-transmitting board, ensure the stability of the vacuum degree, and improve the efficiency of removing bubbles. A leveling agent and / or a defoaming agent is coated between the light-transmitting board and the interlayer. In the synthesis process of the glue-like substance of the glue board, a defoaming agent and / or a leveling agent corresponding to the material properties is added. Among them, a leveling agent and / or a defoaming agent can be coated on the surface of the light-transmitting plate or the interlayer, which can improve the efficiency of bubble removal, reduce surface defects of the interlayer, and improve the appearance and physical properties of the product; when using a leveling agent or a defoaming agent, the existing types and formulas of leveling agents and defoaming agents that match the performance of the interlayer can be selected according to the performance of the interlayer.

[0039] The moisture content of the interlayer of the product of this embodiment is detected by heating a clean evaporating dish in a muffle furnace at 800°C for a predetermined time to a constant weight, and then cooling the mixture to room temperature in a desiccator. Accurately weigh approximately 10.000 g of the interlayer, place it in the evaporating dish, and heat it in a muffle furnace at 800°C to a constant weight, and then weigh it.

[0040] The calculation formula of water content is: W%=(m 前 -m 后 ) / m 前 ×100%. Where W% is the percentage of water content in the interlayer; m 前 is the mass of the interlayer before burning; m 后 It is the mass of the interlayer after burning.

[0041] The method for detecting bubbles in the interlayer of this embodiment is: observing the entire processed composite board with a magnifying glass, and bubbles with a diameter greater than 0.5 mm are considered to be bubbles, and bubbles with a diameter less than 0.5 mm are not considered to be bubbles.

[0042] The method for detecting water ripples in the interlayer of this embodiment is as follows: the composite panel is placed horizontally, and a bright yellow straight line is drawn on the ground two meters away from the plane of the composite panel, with the straight line as parallel to the plane of the composite panel as possible; the observer's line of sight passes through the composite panel to observe the shape of the bright yellow line. The observer's line of sight can be still or moved to observe the shape of the yellow line; if the bright yellow line is observed to be distorted in a jagged shape like water ripples after being refracted by different parts of the composite panel and is no longer a straight line, it indicates that the composite panel has water ripples; otherwise, it is considered that there are no water ripples in the composite panel.

Claims

1. A method for removing solvent from a light-transmitting composite board with an inner layer of glue, characterized in that The following steps are involved: S1. The light-transmitting composite plate is placed in a sealed container, the sealed container having a gas port for connecting to the exhaust pipe, so that the gas port of the sealed container is connected to the exhaust pipe through the exhaust machine; S2. The sealed container is evacuated so that the inner cavity of the sealed container reaches a low vacuum state; S3. The sealed container is transferred to a heating device, and the heating device is heated to maintain a low vacuum in the inner cavity of the sealed container during the heating process; S4. After stopping the vacuuming and heating, the sealed container is removed from the heating device, and the light-transmitting composite board in the sealed container is removed.

2. The method for removing solvent from a light-transmitting composite panel with an inner layer of laminate according to claim 1, characterized in that: In step S3, the sealed container is first heated for a first set time and a first set temperature. After stopping the vacuuming and heating, the sealed container is taken out from the heating device, the light-transmitting composite plate is taken out from the sealed container, the light-transmitting composite plate is placed in the heating device and heated to a set pressure, and then heated for a second set time and a second set temperature.

3. The method for removing solvent from a light-transmitting composite panel with an inner layer of laminate according to claim 2, characterized in that: In step S3, after taking out the light-transmitting composite plate from the sealed container, the light-transmitting composite plate is turned upside down and then placed in a heating device for pressurized heating.

4. The method for removing solvent from a light-transmitting composite panel with an inner layer of laminate according to claim 1, characterized in that: In step S1 , an air guide net is provided in the inner cavity of the sealed container, the end surface of the air guide net is closer to the air port than the end surface of the light-transmitting composite plate, and the air guide net covers the light-transmitting composite plate.

5. The method for removing solvent from a light-transmitting composite panel with an inner laminate according to claim 4, characterized in that: The air guide net is coated on the outside of the light-transmitting composite board.

6. The method for removing solvent from a light-transmitting composite panel with an inner laminate according to claim 4, characterized in that: The air guide net is a flexible mesh structure.

7. The method for removing solvent from a light-transmitting composite panel with an inner laminate according to claim 1, characterized in that: The sealed container is made of a flexible material and includes a first part and a second part that are arranged opposite to each other. The first part and the second part are assembled to form the sealed container with an inner cavity; a positioning protrusion and a positioning groove that cooperate with each other are provided between the edge of the first part and the edge of the second part.

8. The method for removing solvent from a light-transmitting composite panel with an inner laminate according to claim 1, characterized in that: In step S2, the vacuum degree of the inner cavity of the sealed container is evacuated to a low vacuum state of -0.09 to -0.05 MPa.

9. The method for removing solvent from a light-transmitting composite panel with an inner laminate according to claim 2, characterized in that: In step S3, the first set temperature is 80°C to 130°C, the first set time is 5 to 48 hours, and the heating is cooled to room temperature after the first set time. After the cooling is completed, the exhaust is stopped.

10. The method for eliminating bubbles in a rubber sheet according to claim 2, wherein: In step S3, the set pressure is 0.5-5 MPA, the second set temperature is 60° C.-100° C., and the second set time is 5-24 hours.

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