Laminated glass and preparation method thereof

Abstract

The invention discloses laminated glass and a preparation method thereof, and belongs to the technical field of laminated glass preparation. The method comprises the following steps: cleaning and drying a single piece of glass; then pre-laminating the cleaned and dried single glass by adopting a film to obtain pre-laminated glass; sequentially carrying out vacuum lamination and high-temperature curing on the pre-laminated glass by adopting a two-section sectional laminating machine; and finally, cooling the laminated glass subjected to high-temperature curing to complete the preparation of the laminated glass. The invention provides a production mode of glass cleaning, glass / film pre-laminating, vacuum laminating and high-temperature curing, and the production efficiency is greatly improved by changing the production mode.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of laminated glass, and relates to a laminated glass and a preparation method thereof. BACKGROUND

[0002] Flat glass plays an indispensable role in daily life, but there are also many application limitations. As a brittle material, single glass has no ability to resist deformation or disperse stress when subjected to external impact, is prone to cracks and a large number of fragments, and has great safety hazards.

[0003] Laminated glass as safety glass begins to enter people's field of vision. It is to place an organic film between two layers of glass to form a whole. When subjected to external damage, laminated glass not only avoids the splashing of fragments to injure people, but also maintains the integrity of the structure, prolongs the service life, and has more excellent performance, and is widely used in the field of building. However, in view of the current development trend of the real estate industry, the development of curtain wall glass business is under great pressure, and many glass processing enterprises have transformed to the door and window market. In view of the outstanding characteristics of the glass products in the door and window market, such as complex size specifications and urgent delivery cycle, the production efficiency of laminated glass needs to be improved.

[0004] The current mainstream production mode of laminated glass is: glass cleaning → glass / film pre-bonding → roll pressing and degassing → autoclave treatment. The autoclave treatment takes the most time, and the reasons are as follows: in the roll pressing and degassing stage, the residual air between the glass and the film is removed by roll pressing, but it can only remove 95%-98% of the gas, and other gases must be treated in the autoclave at a high temperature of 130-140℃ and a high pressure of 1.1-1.4Mpa for 0.5-1.5 hours to eliminate the residual gas in the previous process and make the PVB between the layers flow viscously, so that the glass and the film are firmly bonded together. Even if some enterprises adopt improved measures such as segmented temperature control (CN114013154A), double-pressure roller system + infrared short-wave heating (CN110054421B), etc., the problem of slow production efficiency has not been fundamentally solved.

[0005] In the whole production process, it takes at least 4-6 hours for a piece of laminated glass to continue to circulate, and this production efficiency cannot meet the demand of the door and window market, so a new production mode and its supporting process are needed to solve this problem. SUMMARY

[0006] The present application aims to provide a laminated glass and a preparation method thereof, to solve the technical problem of low production efficiency of laminated glass in the prior art, which is difficult to meet market demand.

[0007] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application: In a first aspect, the present application provides a method for manufacturing a laminated glass, comprising the following steps: cleaning and drying single glass sheets; pre-laminating the cleaned and dried single glass sheets with adhesive sheets to obtain a pre-laminated glass; vacuum laminating and high-temperature curing the pre-laminated glass in sequence using a two-section laminator; cooling the high-temperature cured laminated glass to complete the manufacturing of the laminated glass.

[0008] Further, in the step of cleaning and drying single glass sheets, pure water is used for cleaning, and the conductivity of the pure water is less than 10 us / cm.

[0009] Further, the step of pre-laminating the cleaned and dried single glass sheets with adhesive sheets to obtain a pre-laminated glass specifically comprises: performing lamination in a clean room, first conveying a first glass sheet to a lamination workstation; then laying a pre-cut adhesive sheet on the first glass sheet; using a suction cup holder to vertically place a second glass sheet in alignment with the first glass sheet; trimming the protruding adhesive sheet between the first glass sheet and the second glass sheet to obtain a laminated glass.

[0010] Further, the temperature of the clean room is 20-25°C, and the humidity is 20-30%.

[0011] Further, the two-section laminator comprises a first box and a second box; the first box is used for vacuum laminating, and the second box is used for high-temperature curing.

[0012] Further, the step of vacuum laminating and high-temperature curing the pre-laminated glass in sequence using a two-section laminator specifically comprises: conveying the pre-laminated glass to the first box, and performing air pumping, lamination, and balancing in sequence at a first preset temperature; conveying the laminated glass to the second box, and performing curing at a second preset temperature.

[0013] Further, the first preset temperature is 140-155°C, and the second preset temperature is 130-145°C.

[0014] Further, the step of performing air pumping, lamination, and balancing in sequence at a first preset temperature specifically comprises: synchronously pumping the upper chamber and the lower chamber of the first box to a vacuum degree of less than 0.2 kPa using a vacuum pump set, so that the gas between the glass and the adhesive sheet is pumped away, and the adhesive sheet begins to soften; opening the inflation valve of the upper chamber, external air enters the upper chamber, the upper chamber and the lower chamber form a pressure difference, the pressure difference is not less than 85kPa, forcing the molten film to fill in the glass gap; opening the pressure relief valve of the lower chamber, and insulating the clamped glass.

[0015] Further, in the step of cooling the high-temperature cured laminated glass, the surface temperature of the laminated glass is cooled to below 50 DEG C.

[0016] In a second aspect, the application provides a laminated glass prepared by the method.

[0017] Compared with the prior art, the application has the following beneficial effects: The application discloses a laminated glass and a preparation method thereof. Single glass is cleaned and dried, glass / film pre-bonding is performed, and then vacuum lamination and high-temperature curing are performed by using a two-section laminating machine, so that continuous production of glass can be realized, manual intervention is reduced, and production efficiency is improved. The use of the two-section laminating machine ensures uniform contact and lamination between the glass and the film, reduces the generation of bubbles and defects, and improves the transparency and optical performance of the laminated glass. The application responds to the prominent features of the door and window market glass products, such as complex size specifications and urgent delivery cycle, and proposes a production mode of glass cleaning, glass / film pre-bonding, vacuum lamination and high-temperature curing. By changing the production mode, the production efficiency is improved by 300%, so as to respond to market changes. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 The flow chart of the preparation method of the laminated glass. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to understand the characteristics and effects of the application, the following will make general description and definition of the terms and phrases mentioned in the specification and claims. Unless otherwise specified, all technical and scientific words used in the specification are the usual meanings understood by those skilled in the art of the application, and when there is a conflict, the definition in the specification shall prevail.

[0021] Theories or mechanisms described and disclosed herein, whether correct or not, should not be considered limiting the scope of the present application, i.e., the present application can be practiced without regard to any particular theory or mechanism.

[0022] Herein, all features defined by numerical ranges or percentage ranges, such as numerical values, amounts, contents and concentrations, are for the sake of brevity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have encompassed and specifically disclosed all possible sub-ranges and individual numerical values within the range (including integers and fractions).

[0023] Herein, unless otherwise specifically noted, "comprise", "comprise", "contain", "have", or similar words do not exclude the presence of other elements or components, but they merely exclude that other elements or components are also present. For example, "A contains a" encompasses the meaning of "A contains a and other" and "A contains only a".

[0024] Herein, for the sake of brevity, all possible combinations of the various technical features in the various embodiments or examples are not described. Therefore, as long as there is no contradiction in the combination of the technical features, the technical features in the various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered as the scope of the present disclosure.

[0025] The present application will be described in further detail below with reference to the accompanying drawings: Referring to Figure 1 The embodiment of the present application discloses a preparation method of laminated glass, comprising the following steps: S1, cleaning and drying single glass; The single glass is conveyed to the cleaning machine to remove surface stains and impurities. On the one hand, it can guarantee the appearance effect of the product, and on the other hand, it can avoid the influence of impurities on the adhesion between the glass and the film.

[0026] The cleaning machine usually uses pure water (conductivity <10 us / cm). If tap water (hard water) is used, it is rich in alkali metal ions such as K + , Ca 2+ , Mg 2+ , which can combine with Si-OH on the surface of the glass, replace hydrogen, and prevent the formation of hydrogen bonds (the main source of force), resulting in a decrease in adhesion. In addition, in cold weather, the cleaning machine water is usually heated to 40-60℃, which can effectively remove the cutting oil, fingerprints and other oily stains on the surface of the glass.

[0027] S2, using a film to pre-bond the single glass after cleaning and drying to obtain a laminated glass after pre-bonding; 1) The working environment is usually in a 100 million level clean room, and the temperature is between 20-25℃ and the humidity is between 20%-30%. This is to ensure the requirements of film storage and laying; 2) The first piece of cleaned and dried glass is transported to the splicing operation table; 3) The optimized cut film is laid flat on the first piece of glass; 4) The second piece of glass is placed vertically on the first piece of glass using the suction cup holder; 5) The excess film between the two pieces of glass is trimmed using a craft knife to avoid contamination of subsequent products in the high-temperature environment.

[0028] S3, the two-section laminator is used to sequentially vacuum laminate and high-temperature cure the pre-spliced laminated glass; The two-section laminator includes a first box body and a second box body; the first laminating box body functions as vacuum laminating, and the second curing box body functions as high-temperature curing. The specific process scheme is as follows: 1) The laminating and heat preservation furnace body is heated to a first temperature (140℃~155℃).

[0029] 2) After the pre-spliced laminated glass is transported to the first box body, the box body is closed; 3) High-temperature air pumping: the upper and lower chambers are synchronously pumped by a vacuum pump set (consisting of one slide valve pump and one Roots pump), and the pumping is continued for a preset time (20min). At this time, since the air pressure on the flexible cover plate (silicone plate) is close, the silicone pressing plate does not apply pressure to the laminated glass downward, and the laminated glass is only affected by temperature and pumping, the latent gas between the glass and the film is pumped away, and the film begins to soften gradually; 4) High-temperature laminating: the upper chamber air inlet valve is opened by the control system, and the pumping is continued for a preset time (7min). At this time, external air enters the upper chamber, and the air pressure difference between the upper and lower chambers is formed (the upper chamber is in atmospheric pressure state, and the lower chamber is in vacuum state), and the pressure in the upper chamber is evenly transmitted to the surface of the laminated glass through the flexible cover plate (silicone plate), forcing the molten film to fully fill the glass gap and achieve tight fitting.

[0030] 5) High-temperature balancing: the lower chamber pressure relief valve is opened by the control system, and the pumping is continued for a preset time (3min). At this time, the air pressure on the flexible cover plate (silicone plate) is close, and the silicone pressing plate does not apply pressure to the laminated glass downward. However, due to the high-temperature laminating, the edge of the laminated glass is more stressed than the middle, and the edge film is thinned due to extrusion. After high-temperature laminating, the two pieces of glass preliminarily bonded by the film (which has been thinned) are easily popped open due to the influence of glass rigidity, resulting in air bubble defects. Therefore, it is necessary to balance the temperature for a certain period of time after laminating.

[0031] 6) high temperature curing: after the heat preservation of the laminated glass is transported to the second box by the conveying roller, the box is closed and lasts for a preset time (30 min), and the crosslinking degree of the film is increased to 60-80% through a high temperature environment (130℃~145℃), so as to ensure excellent mechanical properties, wherein the high temperature curing duration = high temperature pumping time + high temperature lamination time + high temperature balance time, so as to achieve the same production rhythm of the two boxes and maintain continuous production.

[0032] S4, cooling treatment is performed on the laminated glass after high temperature curing, and the preparation of the laminated glass is completed.

[0033] 1) the laminated glass which has been laminated is transported to the cooling area on both sides provided with closely arranged fans through the conveying roller, and cooling is performed; 2) after the surface of the glass is reduced to 50℃, the glass is placed on the rack through the suction cup / manual.

[0034] Through experiments, the laminated box temperature is 140-155℃, and the curing box temperature is 130-145℃, which can well produce good products, so the following process parameters in the temperature range can be explored to adapt to the conventional product structure, as shown in Table 1.

[0035] Table 1 Conventional product structure and process parameters Product structure High temperature evacuation time High temperature lamination time High temperature equilibration time 6G / 1.52 / 6G 18-20 min 7 min 3 min 8G / 1.52 / 8G 23-25 min 7 min 3 min 10G / 1.52 / 10G 29-31 min 7 min 3 min 12G / 1.52 / 12G 34-36 min 6.5 min 3 min In addition to adjusting the processing temperature, pumping time, and lamination time, the vacuum degree is also a key control area. The absolute vacuum in the high temperature pumping stage should be reduced to below 0.2kPa, which can avoid the situation that water vapor is left in the glass due to insufficient pumping. In the high temperature lamination stage, the vacuum degree difference between the upper and lower chambers should be at least 85kPa, that is, the force acting on the surface of the laminated glass is 0.86kgf / cm 2 The above.

[0036] Taking a piece of 6G / 1.52 / 6G (6mm general white tempered glass + 1.52mm film + 6mm general white tempered glass) as an example, in addition to glass cleaning and glass / film pre-bonding, the difference between the traditional production mode and the technical solution is: Rolling + autoclave mode: production cycle is more than 4 hours Lamination + curing mode: high temperature pumping time (20min) + high temperature lamination time (7min) + high temperature balance time (3min) + high temperature curing time (30min) = 1 hour Therefore, the lamination + curing mode of the present application can improve the efficiency: (4-1) / 1*100%=300% The application will be further described in connection with the following detailed description of specific embodiments. It should be understood that these embodiments are intended to illustrate the application and are not intended to limit the scope of the application. Furthermore, it should be understood that various modifications and changes can be made to the application by those skilled in the art upon reading the contents of this specification and such equivalent forms are considered to fall within the scope of the application as defined by the appended claims.

[0037] The following examples use apparatuses and devices that are conventional in the art. The experimental methods in the following examples, unless otherwise specified, are generally performed according to conventional conditions, or according to the conditions recommended by the manufacturers. The following examples use various raw materials, unless otherwise specified, all of which are conventional commercially available products, and the specifications thereof are conventional in the art. In the specification of the present application and the following examples, unless otherwise specified, "%" means weight percent, "parts" means weight parts, and the ratio means weight ratio.

[0038] Example 1: S1, using pure water to clean and dry the single glass, the conductivity of pure water <10 us / cm; S2, using a film to pre-laminating the single glass after cleaning and drying, to obtain the laminated glass after pre-laminating; S201, laminating treatment in a clean room, first conveying the first glass to the laminating operation table; the temperature of the clean room is 20℃, and the humidity is 20%; S202, then laying the pre-cut film on the first glass; S203, using the suction cup frame to vertically place the second glass on the first glass; S204, trimming the protruding film between the first glass and the second glass to obtain the laminated glass after laminating.

[0039] S3, using a two-section laminating machine to sequentially vacuum laminating and high-temperature curing the laminated glass after pre-laminating; S301, conveying the laminated glass after pre-laminating to the first box, sequentially performing air extraction, laminating and balancing at 150℃; 1) synchronously extracting the upper chamber and the lower chamber of the first box by the vacuum pump group, the vacuum degree is reduced to below 0.2kPa, so that the gas between the glass and the film is extracted, and the film begins to soften; 2) opening the air charging valve of the upper chamber, the external air enters the upper chamber, and the upper chamber and the lower chamber form a pressure difference, the pressure difference is not less than 85kPa, forcing the molten film to fully fill in the glass gap; 3) opening the pressure relief valve of the lower chamber to heat the laminated glass.

[0040] S302, conveying the laminated glass to the second box for curing at 140℃.

[0041] S4, cooling the high-temperature cured laminated glass to below 50℃ to complete the preparation of the laminated glass.

[0042] Example 2: S1, using pure water to clean and dry the single glass, the conductivity of the pure water is <10us / cm; S2, using the film to pre-laminate the single glass after cleaning and drying, to obtain the pre-laminated glass; S201, laminating in a clean room, first conveying the first glass to the laminating operation table; the temperature of the clean room is 22℃, and the humidity is 25%; S202, then laying the pre-cut film on the first glass; S203, using the suction cup frame to vertically place the second glass on the first glass; S204, trimming the protruding film between the first glass and the second glass to obtain the laminated glass.

[0043] S3, using a two-section laminator to sequentially vacuum laminate and high-temperature cure the pre-laminated glass; S301, conveying the pre-laminated glass to the first box, sequentially performing air extraction, lamination and balancing at 140℃; 1) synchronously extracting the upper chamber and the lower chamber of the first box by the vacuum pump group, the vacuum degree is reduced to below 0.2kPa, the gas between the glass and the film is extracted, and the film begins to soften; 2) open the air inlet valve of the upper chamber, the external air enters the upper chamber, the upper chamber and the lower chamber form a pressure difference, the pressure difference is not less than 85kPa, forcing the molten film to fully fill in the glass gap; 3) open the pressure relief valve of the lower chamber to heat the laminated glass.

[0044] S302, conveying the laminated glass to the second box for curing at 135℃.

[0045] S4, cooling the high-temperature cured laminated glass to below 50℃ to complete the preparation of the laminated glass.

[0046] Example 3: S1, using pure water to clean and dry the single glass, the conductivity of the pure water is <10us / cm; S2, using the film to pre-laminate the single glass after cleaning and drying, to obtain the pre-laminated glass; S201, laminating in a clean room, first conveying the first glass to the laminating operation table; the temperature of the clean room is 22℃, and the humidity is 25%; S202, the pre-cut film is laid on the first glass; S203, the second glass is placed vertically on the first glass using the chuck frame; S204, the protruding film between the first glass and the second glass is trimmed to obtain the laminated glass after splicing.

[0047] S3, the laminated glass after splicing is subjected to vacuum lamination and high-temperature curing in turn using a two-section laminator; S301, the laminated glass after splicing is conveyed to the first box body, and is subjected to air extraction, lamination and balancing in turn at 145°C; 1) the upper chamber and the lower chamber of the first box body are synchronously subjected to air extraction by the vacuum pump group, the vacuum degree is reduced to below 0.2kPa, the gas between the glass and the film is extracted, and the film begins to soften; 2) the air inlet valve of the upper chamber is opened, the external air enters the upper chamber, the upper chamber and the lower chamber form a pressure difference, the pressure difference is not less than 85kPa, and the molten film is forced to fill in the glass gap; 3) the pressure relief valve of the lower chamber is opened, and the laminated glass is subjected to heat preservation.

[0048] S302, the laminated glass is conveyed to the second box body, and is subjected to curing at 130°C.

[0049] S4, the laminated glass after high-temperature curing is subjected to cooling treatment to below 50°C, and the preparation of the laminated glass is completed.

[0050] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for producing a laminated glass, characterized by, The method comprises the following steps: cleaning and drying single glass sheets; preliminarily bonding the cleaned and dried single glass sheets with a film to obtain a laminated glass after preliminary bonding; vacuum laminating and high-temperature curing the laminated glass after preliminary bonding by using a two-section laminating machine; cooling the laminated glass after high-temperature curing to complete the preparation of the laminated glass.

2. The method of claim 1, wherein the method is performed at a temperature of 100 to 200°C. In the step of cleaning and drying single glass sheets, pure water is used for cleaning, and the conductivity of the pure water is less than 10 us / cm.

3. The method of claim 1, wherein the method further comprises, The step of preliminarily bonding the cleaned and dried single glass sheets with a film to obtain a laminated glass after preliminary bonding specifically comprises the following steps: performing bonding in a clean room, first conveying a first glass sheet to a bonding operation table; then laying a preliminarily cut film on the first glass sheet; using a suction cup frame to vertically place a second glass sheet on the first glass sheet; trimming the protruding film between the first glass sheet and the second glass sheet to obtain a laminated glass after bonding.

4. The method of claim 3, wherein the method further comprises, The temperature of the clean room is 20-25 DEG C, and the humidity is 20-30%.

5. The method of claim 1, wherein the method further comprises, The two-section laminating machine comprises a first box body and a second box body, wherein the first box body is used for vacuum laminating, and the second box body is used for high-temperature curing.

6. The method of claim 5, wherein the method further comprises, The step of vacuum laminating and high-temperature curing the laminated glass after preliminary bonding by using a two-section laminating machine specifically comprises the following steps: conveying the laminated glass after preliminary bonding to the first box body, and sequentially performing air extraction, laminating and balancing at a first preset temperature; conveying the laminated glass to the second box body, and performing curing at a second preset temperature.

7. The method of claim 6, wherein the method further comprises, The first preset temperature is 140-155 DEG C, and the second preset temperature is 130-145 DEG C.

8. The method of claim 6, wherein the method further comprises, The step of sequentially performing air extraction, laminating and balancing at the first preset temperature specifically comprises the following steps: synchronously extracting air from the upper chamber and the lower chamber of the first box body by using a vacuum pump group, so that the vacuum degree is reduced to below 0.2 kPa, the gas between the glass and the film is extracted, and the film starts to soften; opening the air charging valve of the upper chamber, so that external air enters the upper chamber, the upper chamber and the lower chamber form a pressure difference, and the pressure difference is not less than 85 kPa, so that the molten film is forced to fully fill in the gap between the glass; opening the pressure relief valve of the lower chamber to heat the laminated glass.

9. The method of claim 1, wherein the method further comprises, In the step of cooling the laminated glass after high-temperature curing, the surface temperature of the laminated glass is cooled to below 50 DEG C.

10. A laminated glass characterized by The laminated glass is prepared by using the method according to any one of claims 1-9. The laminated glass is prepared by using the method according to any one of claims 1-9.

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