Lightweight laminated glass for automobiles and method for manufacturing the same

Abstract

The application discloses a kind of light car laminated glass and preparation method thereof, belong to laminated car glass production technical field.The light car laminated glass is bent thick glass, adhesive film layer, flat thin glass in turn from bottom to top, when vacuum pressure is covered, thin glass needs to bend the same curvature as thick glass, flat thin glass is provided with groove around.The thick glass is combined with thin glass to reduce the mass of laminated glass as a whole, realize light weight;Thin glass exists groove around, by glass and gap, and the shape of gap is isosceles triangle;The thin glass of the application is provided with groove around in car laminated glass, ensure the space of bending deformation when vacuum pressure is covered, not easy to break, improve production yield, improve the light distortion of finished product simultaneously.

Description

Technical Field

[0001] This invention belongs to the field of laminated automotive glass manufacturing technology, specifically relating to a lightweight laminated automotive glass and its preparation method. Background Technology

[0002] Traditional laminated automotive glass consists of two thick panes of glass, resulting in significant weight and limited applications. Current lightweight laminated automotive glass manufacturing processes combine a hot-bent thick pane of glass with a thin, flat pane of glass, with a PVB (polyvinyl butyral) film placed between them for vacuum lamination. During lamination, the thin flat pane needs to be bent into the hot-bent thick pane. Due to factors such as pressure, curvature, and the glass itself, it tends to arch under pressure. Excessive pressure can cause the flat glass to bend significantly with a large hyperbola, easily creating wrinkles at the edges, leading to optical distortion and breakage. Insufficient pressure, on the other hand, can result in incomplete melting of the film. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention aims to provide a method for manufacturing lightweight laminated automotive glass. A certain amount of grooves are added around the perimeter of the thin glass, ensuring space for bending deformation during vacuum lamination, reducing the risk of breakage, improving production yield, and simultaneously reducing optical distortion in the finished product. Another technical problem this invention aims to solve is to provide a lightweight laminated automotive glass that, while achieving lightweight construction, does not warp or break, and whose impact resistance and penetration resistance both meet requirements.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] A method for preparing lightweight automotive laminated glass includes, from bottom to top, hot-bent thick glass, film layer, and flat thin glass. During vacuum lamination, the thin glass needs to be bent to the same curvature as the thick glass, and grooves are added around the flat thin glass.

[0006] The method for preparing lightweight laminated automotive glass involves hot-bent thick glass with a thickness of 1.6-5 mm and flat thin glass with a thickness of 0.3-1.3 mm.

[0007] The method for preparing lightweight laminated automotive glass states that the groove consists of glass and a gap, the gap being any one of a circle, square, rectangle, or triangle.

[0008] The method for preparing lightweight laminated automotive glass describes a gap with an isosceles triangle shape, a leg length of 1 mm, and a vertex angle of 30°.

[0009] The method for preparing lightweight laminated automotive glass states that the radius of curvature for both the thin and thick glass is 2500 mm.

[0010] The method for preparing the lightweight laminated automotive glass includes the following steps:

[0011] (1) Use Solidworks software to draw the shape of the flat thin glass in the software, and then import the parameters of the flat thin glass - material, elastic modulus, Poisson's ratio, set the force - vacuum pump pressure, the software automatically calculates the position of the maximum force deformation, and cuts the groove at the position of the maximum force deformation.

[0012] (2) Chemical tempering: The thin flat glass is immersed in potassium nitrate solution;

[0013] (3) Laminated glass processing: Place each component on the silicone plate in sequence;

[0014] (4) Attach one side of the sealing strip to the silicone plate, and each component is wrapped in it; then, cover it with another patterned silicone plate, so that the sealing strip and the two silicone plates form an independent space; put the above-mentioned stacked curved glass + film + flat thin glass into a vacuum bag; use a vacuum pump to extract the internal air under normal temperature conditions.

[0015] (5) Place it in an oven to heat, and after cooling, take it out to obtain lightweight laminated automotive glass.

[0016] The preparation method of the lightweight automotive laminated glass, step (1), parameter settings, material: glass, elastic modulus: 441×10 8 ~882×10 8 Pa, Poisson's ratio: 0.11~0.30, force magnitude - vacuum pump pressure: 90Kpa.

[0017] The method for preparing the lightweight automotive laminated glass includes step (2), in which the glass is immersed in a potassium nitrate solution with a mass concentration of 99.9% for 100 minutes at a immersion temperature of 425°C.

[0018] The method for preparing the lightweight automotive laminated glass involves vacuuming at room temperature for 5-60 minutes; heating in an oven at 110-170°C for 20-60 minutes; preferably, vacuuming at room temperature for 30 minutes; heating in an oven at 140°C for 30 minutes; and maintaining vacuum during the heat preservation period.

[0019] Lightweight laminated automotive glass prepared by the above method.

[0020] Beneficial effects: Compared with existing technologies, the advantages of this invention include:

[0021] 1. A lightweight laminated automotive glass, comprising, from bottom to top, hot-bent thick glass (1.6-5mm thick), an interlayer, and flat thin glass (0.3-1.3mm), wherein the combination of thick and thin glass reduces the overall weight of the laminated glass and achieves lightweighting;

[0022] 2. Thin glass can be tempered or untempered;

[0023] 3. Grooves are set around the thin glass, consisting of glass and gaps, which ensures space for bending deformation during vacuum pressing, making it less prone to breakage, improving production yield, and improving the optical distortion of the finished product.

[0024] 4. During vacuum lamination, thin glass needs to be bent to the same curvature as thick glass. The greater the curvature of the hypercurvature, the larger the area of ​​the gap. Attached Figure Description

[0025] Figure 1 A schematic diagram of the lightweight laminated automotive glass structure prepared in Example 1;

[0026] Figure 2 The diagram shows the results of the stress analysis on the flat glass.

[0027] Figure 3 This is a schematic diagram of the trench structure;

[0028] Figure 4 This is a schematic diagram of the laminated automotive glass structure prepared for Comparative Example 1. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to specific examples.

[0030] Example 1

[0031] A schematic diagram of a lightweight laminated automotive glass structure, as shown below. Figure 1 As shown, from bottom to top, the layers are: hot-bent thick glass 11, film layer 12, and flat thin glass (with grooves) 13. The hot-bent thick glass 11 is physically tempered glass with a thickness of 3 mm; the flat thin glass is medium-aluminum glass with grooves added and then chemically tempered, with a thickness of 0.7 mm. The manufacturing process includes the following steps:

[0032] (1) Flat glass processing: First, draw the shape of the flat glass in the Solidworks software, then import the parameters of the flat glass: material: glass, elastic modulus: 441×10 8 ~882×10 8 Pa, Poisson's ratio: 0.11~0.30, force magnitude - vacuum pump pressure; 90Kpa, the software automatically calculates the location of the maximum stress deformation, such as... Figure 2As shown; by Figure 2 It can be seen that the red part is the place with the greatest deformation, which means that it will break first during the preparation process. We just need to cut grooves in the red part.

[0033] Then cut and grind the required shape on normal glass, such as... Figure 3 As shown, the groove consists of glass and gaps, with the gaps being isosceles triangles with three long sides. Figure 2 The dimensions are: waist length 1mm, apex angle 30°. Figure 3 );

[0034] Finally, the glass is chemically tempered and immersed in a potassium nitrate solution for 100 minutes at a temperature of 425°C. The solution has a mass concentration of 99.9%.

[0035] (2) Laminated glass processing: First, place each component on the silicone plate in sequence. The silicone plate has a pattern with a depth of 0.1mm.

[0036] Next, one side of the sealing strip is pasted onto the silicone plate, and each component is wrapped inside; then, another patterned silicone plate is placed on top, so that the sealing strip and the two silicone plates form an independent space; the above-mentioned layers of curved glass + film + flat thin glass are placed into a vacuum bag; then, the internal air is extracted using a vacuum pump at room temperature.

[0037] Finally, after 30 minutes of extraction, during vacuum lamination, the thin glass needs to be bent to the same curvature as the thick glass, with a radius of curvature of 2500 mm. The silicone plate and other components are then placed in a 140℃ oven for 30 minutes. After cooling, they are removed to obtain the desired result. Figure 1 The lightweight laminated automotive glass shown.

[0038] In this embodiment, the lightweight laminated automotive glass, specifically in this embodiment, did not exhibit any warping or cracking, and its impact resistance and penetration resistance both met the requirements.

[0039] Example 2

[0040] A lightweight laminated automotive glass comprises, from bottom to top, a hot-bent thick glass (2.0 mm thick), an interlayer, and a flat thin glass (0.5 mm). The hot-bent thick glass is physically tempered glass; the flat thin glass is medium-aluminum glass that has been chemically tempered after being grooved. The manufacturing process includes the following steps:

[0041] (1) Flat glass processing: First, draw the shape of the flat glass in the Solidworks software, then import the parameters of the flat glass: material: glass, elastic modulus: 441×10 8 ~882×10 8Pa, Poisson's ratio: 0.11~0.30, force magnitude - vacuum pump pressure; 90Kpa, the software automatically calculates the location of the maximum stress deformation, and the groove is cut at the location of the maximum stress deformation; the groove is composed of glass and gaps, the gap shape is circular with a radius of 0.5mm, and there are 3 on each long side;

[0042] Finally, the glass is chemically tempered and immersed in a potassium nitrate solution for 100 minutes at a temperature of 425°C. The solution has a mass concentration of 99.9%.

[0043] (2) Laminated glass processing: First, place each component on the silicone plate in sequence. The silicone plate has a pattern with a depth of 0.1mm.

[0044] Next, one side of the sealing strip is pasted onto the silicone plate, and each component is wrapped inside; then, another patterned silicone plate is placed on top, so that the sealing strip and the two silicone plates form an independent space; the above-mentioned layers of curved glass + film + flat thin glass are placed into a vacuum bag; then, the internal air is extracted using a vacuum pump at room temperature.

[0045] Finally, after 60 minutes of extraction, during vacuum lamination, the thin glass needs to be bent to the same curvature as the thick glass, with a radius of curvature of 2500mm. The silicone sheet and other components are then placed in a 140℃ oven for 30 minutes. After cooling, the lightweight laminated automotive glass is obtained.

[0046] In this embodiment, the lightweight laminated automotive glass, specifically in this embodiment, the sample did not bulge or crack, and its impact resistance and penetration resistance both met the requirements, as shown in Table 1.

[0047] Example 3

[0048] A lightweight laminated automotive glass comprises, from bottom to top, a hot-bent thick glass (5mm thick), an interlayer, and a flat thin glass (1.1mm thick). The hot-bent thick glass is physically tempered glass; the flat thin glass is medium-aluminum glass that has been chemically tempered after being grooved. The manufacturing process includes the following steps:

[0049] (1) Flat glass processing: First, draw the shape of the flat glass in the Solidworks software, then import the parameters of the flat glass: material: glass, elastic modulus: 441×10 8 ~882×10 8 Pa, Poisson's ratio: 0.11~0.30, force magnitude - vacuum pump pressure; 90Kpa, the software automatically calculates the location of the maximum stress deformation, and the groove is cut at the location of the maximum stress deformation; the groove is composed of glass and gaps, the gap shape is square, the side length is 0.6mm, and there are 4 on each long side;

[0050] Finally, the glass is chemically tempered and immersed in a potassium nitrate solution for 100 minutes at a temperature of 425°C. The solution has a mass concentration of 99.9%.

[0051] (2) Laminated glass processing: First, place each component on the silicone plate in sequence. The silicone plate has a pattern with a depth of 0.1mm.

[0052] Next, one side of the sealing strip is pasted onto the silicone plate, and each component is wrapped inside; then, another patterned silicone plate is placed on top, so that the sealing strip and the two silicone plates form an independent space; the above-mentioned layers of curved glass + film + flat thin glass are placed into a vacuum bag; then, the internal air is extracted using a vacuum pump at room temperature.

[0053] Finally, after 5 minutes of extraction, during vacuum lamination, the thin glass needs to be bent to the same curvature as the thick glass, with a radius of curvature of 2500mm. The silicone sheet and other components are then placed in a 140℃ oven for 40 minutes. After cooling, the lightweight laminated automotive glass is obtained.

[0054] In this embodiment, the lightweight laminated automotive glass, specifically in this embodiment, the sample did not bulge or crack, and its impact resistance and penetration resistance both met the requirements, as shown in Table 1.

[0055] Comparative Example 1

[0056] like Figure 4 The diagram shows Comparative Example 1 of the present invention, comprising, from bottom to top, hot-bent thick glass 21, film layer 22, and flat thin glass 22. Specifically, the hot-bent thick glass 21 (physically tempered) has a thickness of 3 mm, and the flat thin glass 22 has a thickness of 0.7 mm. Comparative Example 1 uses a lightweight automotive laminated glass production method (the production process is the same as in Example 1, except that the flat thin glass is replaced with a non-grooved glass) to prepare laminated automotive glass-1 and laminated automotive glass-2.

[0057] The optical distortion, penetration resistance, and impact resistance of the laminated automotive glass prepared in Example 1 and Comparative Example 1 were tested, and their appearance changes were observed. The performance testing methods were in accordance with standards GB-T-5137.1-2020 and GB-T-5137.2-2020. The test results are shown in Table 1. As can be seen from the results in Table 1, the laminated automotive glass of Example 1 meets the performance requirements without exhibiting warping or cracking.

[0058] Table 1. Experimental results of Example 1 and Comparative Example 1

[0059]

[0060] Note: OK indicates that the test passed and meets national standards; NG indicates that the test failed and does not meet national standards; / indicates that the test could not be conducted.

[0061] Comparative Example 2

[0062] Laminated automotive glass comprises, from bottom to top, hot-bent thick glass, an interlayer film, and a flat thin glass. Specifically, the hot-bent thick glass (physically tempered) is 2 mm thick, and the flat thin glass is 0.5 mm thick. Comparative Example 2 uses a lightweight automotive laminated glass production method (the production process is the same as in Example 2, except that the flat thin glass is replaced with a non-grooved one) to prepare laminated automotive glass-1 and laminated automotive glass-2.

[0063] The optical distortion, penetration resistance, and impact resistance of the laminated automotive glass prepared in Example 2 and Comparative Example 2 were tested, and their appearance changes were observed. The performance testing methods were in accordance with standards GB-T-5137.1-2020 and GB-T-5137.2-2020. The test results are shown in Table 2. As can be seen from the results in Table 2, the laminated automotive glass of Example 2 meets the performance requirements without exhibiting warping or cracking.

[0064] Table 2. Experimental results of Example 2 and Comparative Example 2

[0065]

[0066]

[0067] Note: OK indicates that the test passed and meets national standards; NG indicates that the test failed and does not meet national standards; / indicates that the test could not be conducted.

[0068] Comparative Example 3

[0069] Laminated automotive glass comprises, from bottom to top, hot-bent thick glass, an interlayer film, and a flat thin glass. Specifically, the hot-bent thick glass (physically tempered) is 5 mm thick, and the flat thin glass is 1.1 mm thick. Comparative Example 3 uses a lightweight automotive laminated glass production method (the production process is the same as in Example 3, except that the flat thin glass is replaced with a non-grooved one) to prepare laminated automotive glass-1 and laminated automotive glass-2.

[0070] The optical distortion, penetration resistance, and impact resistance of the laminated automotive glass prepared in Example 3 and Comparative Example 3 were tested, and their appearance changes were observed. The above performance test methods refer to standards GB-T-5137.1-2020 and GB-T-5137.2-2020. The test results are shown in Table 3. As can be seen from the results in Table 3, the laminated automotive glass of Example 3 meets the performance requirements without exhibiting warping or cracking.

[0071] Table 3. Experimental results of Example 3 and Comparative Example 3

[0072]

[0073] Note: OK indicates that the test passed and meets national standards; NG indicates that the test failed and does not meet national standards; / indicates that the test could not be conducted.

Claims

1. A method for manufacturing a light weight automotive laminated glass, the light weight automotive laminated glass comprising, from bottom to top, a heat-bent thick glass, a layer of interlayer, and a flat thin glass, characterized in that, In vacuum lamination, the thin glass needs to be bent with the same curvature as the thick glass, and a groove is arranged around the flat thin glass; the groove is composed of glass and a gap, and the gap has any one of a circular shape, a square shape, a rectangular shape or a triangular shape.

2. The method of claim 1, wherein the method further comprises the step of: The thick glass has a thickness of 1.6-5 mm, and the flat thin glass has a thickness of 0.3-1.3 mm. ​ 3. The method of claim 1, wherein the method further comprises the step of: The gap has an isosceles triangular shape, a waist length of 1 mm, and a top angle of 30°. ​ 4. The method of claim 1, wherein the method further comprises the step of: The curvature radius of the thin glass and the thick glass is 2500 mm. ​ 5. The method of claim 1, wherein the method further comprises the step of: The method comprises the following steps: ​ (1) using Solidworks software to draw the shape of the flat thin glass in the software, and then importing the parameters of the flat thin glass, such as material, elastic modulus, Poisson's ratio, and setting the stress size-vacuum pump pressure, and the software automatically calculates the position of the maximum stress deformation, and cuts the groove at the position of the maximum stress deformation; (2) chemical tempering forming, soaking the flat thin glass in a potassium nitrate solution; (3) laminated glass processing: placing each component on the silicone plate in order; (4) one side of the sealant strip is pasted on the silicone plate, and each component is wrapped therein; Then, cover the other silicone plate with patterns on it on top, so that the sealant strip and the two silicone plates form an independent space; place the above sequentially stacked bent glass + film + flat thin glass into a vacuum bag; extract the internal air under normal temperature conditions with a vacuum pump; (5) place in an oven for heating, and take out after cooling to obtain lightweight laminated automotive glass.

6. The method of claim 5, wherein the method further comprises the step of applying a primer to the surface of the glass sheet. Step (1), parameter settings: material: glass, elastic modulus: 441×10 8 ~882×10 8 Pa, Poisson's ratio: 0.11~0.30, force magnitude - vacuum pump pressure: 90KPa.

7. The method of claim 5, wherein the method further comprises the step of: In step (2), the flat thin glass is soaked in a potassium nitrate solution with a mass concentration of 99.9% for 100 min, and the soaking temperature is 425°C. ​ 8. The method of claim 5, wherein the method further comprises the step of: The vacuum is extracted for 5-60 min at normal temperature; the oven is heated at 110-170°C for 20-60 min; and the vacuum is maintained during the heat preservation period. ​ 9. Lightweight laminated automotive glass prepared by the method of any one of claims 1-8.

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