Locally laminated polymer glasses and methods of making same

Abstract

The invention belongs to the technical field of functional polymer transparent material manufacturing, and particularly relates to local laminated polymer glass and a preparation method thereof. A partially laminated polymer glass includes an outer layer, an inner layer, and an intermediate layer; the middle layer is arranged between the outer layer and the inner layer and is used for laminating the outer layer and the inner layer; wherein the inner layer covers the local inner surface of the outer layer. According to the locally laminated polymer glass provided by the invention, a specific area is enhanced, and the effect of overall weight reduction is also achieved.

Description

Technical Field

[0001] This application belongs to the field of functional polymer transparent material manufacturing technology, specifically relating to a partially laminated polymer glass and its preparation method. Background Technology

[0002] Laminated glass, a key material combining protection and light transmission, has been widely used in aerospace, rail transportation, and construction. In the aerospace field, cockpit transparent components must simultaneously meet requirements such as high bird strike resistance, overall weight reduction, and stringent optical performance. However, existing technologies suffer from the following drawbacks: **Structural Limitations:** Traditional hot-pressing lamination processes primarily manufacture flat or low-curvature laminated glass, making it difficult to achieve the high curvature, complex shapes, and high optical (optical distortion ≤ 1 / 12) structures required for aerospace cockpits. This results in excessive optical distortion and limited field of view. **Functional Limitations:** Existing laminated glass has a uniformly reinforced structure, making it impossible to locally strengthen high-stress areas (such as impact contact points), resulting in a trade-off between overall weight reduction and localized strengthening. **Low Process Efficiency:** Relying on integral hot-pressing lamination requires multiple high-temperature and high-pressure processes, leading to long manufacturing cycles for individual pieces and hindering mass production.

[0003] These defects have limited the application breakthrough of laminated glass in the field of high-end equipment. Therefore, there is an urgent need for a laminated glass that can achieve complex surfaces, high optical accuracy and zoned reinforcement. Summary of the Invention

[0004] The technical objective of this application is to at least solve the technical problem that existing laminated glass cannot achieve regional reinforcement. The locally laminated polymer glass provided by this application achieves both reinforcement in specific areas and overall weight reduction. The preparation method provided by this application is applicable to the lamination of planar, curved, and irregularly shaped glass, enabling local lamination of polymer glass without the need for surface grinding and polishing. This fully leverages the advantages of various material properties, improving the manufacturing efficiency and performance of polymer glass.

[0005] A first aspect of this application is to provide a partially laminated polymer glass, comprising: an outer layer, an inner layer, and an intermediate layer; the intermediate layer is disposed between the outer layer and the inner layer for laminating the outer layer and the inner layer; wherein the inner layer covers a portion of the inner surface of the outer layer, and, as needed, the outer surface area of ​​the inner layer is less than or equal to the inner surface area of ​​the outer layer. This achieves reinforcement, allowing for reinforcement of specific areas as needed, while simultaneously achieving overall weight reduction.

[0006] In one embodiment, the materials of the inner layer and the outer layer independently comprise one or more of polymethyl methacrylate, polycarbonate, and polyamide.

[0007] In one embodiment, the material of the intermediate layer includes one or more of polyvinyl butyral and thermoplastic polyurethane.

[0008] The second aspect of this application provides a method for preparing partially laminated polymer glass, comprising: step S01: attaching protective films to the non-laminated areas of an outer layer preform and an inner layer preform, and respectively installing the outer layer preform and the inner layer preform into the moving mold cavity and the fixed mold cavity of an injection molding die; step S02: pre-closing the injection molding die, pouring molten intermediate layer material between the outer layer preform and the inner layer preform, pressing, and cooling to obtain a partially laminated polymer glass preform; step S03: performing post-processing on the partially laminated polymer glass preform to obtain partially laminated polymer glass. This preparation method is applicable to the lamination of planar, curved, and irregularly shaped glass, enabling partial lamination of polymer glass without the need for surface polishing, fully utilizing the advantages of various material properties, and improving the manufacturing efficiency and performance of polymer glass.

[0009] In one embodiment, in step S01, the protective film includes one or more of thermoplastic polyurethane film, polyvinyl chloride film, or polyimide film. The protective film effectively prevents damage to the glass surface caused by the mold during lamination, preserving the original high optical surface quality of the polymer glass single-layer preform, eliminating the need for subsequent grinding, polishing, and repair of the polymer glass surface.

[0010] In one embodiment, in step S01, the outer layer blank and the inner layer blank are prepared by thermoforming or injection molding; during the preparation process, the surface area of ​​the inner layer blank is controlled to be less than or equal to the surface area of ​​the outer layer blank. By controlling the surface areas of the inner and outer layer blanks and the lamination area of ​​the inner and outer layers, the areas that need to be reinforced are laminated, achieving reinforcement of specific areas while also reducing overall weight.

[0011] In one embodiment, in step S02, before the pre-closing, the outer blank and the inner blank are heated. The heating method includes: heating the injection molding die to heat the corresponding outer blank and inner blank using heat conduction; or heating the surfaces of the outer blank and the inner blank using infrared radiation. Surface heating of the blanks is highly efficient and saves heating time.

[0012] In one embodiment, in step S02, after pre-closing, a gap is maintained between the outer and inner blanks to allow for the injection of molten intermediate layer material. The size of the gap between the outer and inner blanks can be adjusted as needed; a larger gap facilitates the injection and flow of the intermediate layer material.

[0013] In one embodiment, step S02, the cooling includes cooling to below 45°C while maintaining a cavity pressure ≥6MPa. Maintaining high pressure during cooling and reducing to the target temperature effectively avoids defects such as vacuum bubbles and optical distortion caused by large shrinkage of the intermediate layer material during the cooling process.

[0014] In one embodiment, step S03, the post-processing includes removing excess areas of the partially laminated polymer glass preform and the protective film.

[0015] The beneficial effects of this application include at least one of the following: The locally laminated polymer glass provided in this application achieves both reinforcement in specific areas and overall weight reduction.

[0016] The method for preparing partially laminated polymer glass provided in this application realizes the partial lamination of outer and inner preforms, and the lamination area can be adjusted according to the needs of those skilled in the art.

[0017] This preparation method effectively avoids damage to the glass surface caused by the mold during lamination by attaching protective films to the non-laminated areas of the outer and inner preforms. It eliminates the need for subsequent grinding and polishing repair of the polymer glass surface, simplifying the process. Furthermore, the lamination process does not require overall heating of the inner and outer preforms; only surface heating is necessary. This saves heating time and shortens the production cycle.

[0018] The cooling process of this preparation method is carried out under high pressure and reduced to the target temperature, which can effectively avoid defects such as vacuum bubbles and optical distortion caused by large shrinkage of the intermediate layer material during the cooling process. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic flowchart of the process for preparing the partially laminated polymer glass provided in this application is shown. Figure 2 (a) and (b) in the figure respectively schematically show the inner layer blank and the outer layer blank provided in an embodiment of the present application; Figure 3 A schematic diagram of a partially laminated polymer glass preform provided in one embodiment of this application is shown. Among them, 1000 is the inner blank; 2000 is the outer blank; 10 is the net size area; 20 is the process margin; 30 is the positioning area; and 40 is the injection port. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0021] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0022] Traditional aircraft transparent components are mostly made of polymethyl methacrylate (PMMA) sheets through hot bending and vacuum forming, or inorganic glass through hot bending and hot pressing lamination, all from the same material. As aircraft speeds continue to increase, they need to withstand bird strikes at extremely high relative speeds during takeoff and landing, while also meeting overall weight reduction requirements and adapting to various aerodynamic loads and environmental changes. This places higher demands on the materials and manufacturing processes of aircraft cockpit transparent components, especially the windshield glass. If traditional PMMA is used, its poor bird strike resistance necessitates a significant increase in PMMA thickness to meet the high bird strike resistance requirements of aircraft windshields, leading to a substantial increase in weight. While inorganic glass can be used by laminating multiple thin single-layer glass sheets, its density is twice that of organic transparent materials, resulting in significant weight for inorganic glass transparent components as well. Furthermore, it is difficult to manufacture cockpit transparent components with large curvature structures using inorganic glass. Therefore, a balance of wear resistance, lightweight, high optical performance, and high bird strike resistance has become the development direction for the next generation of aircraft cockpit transparent components.

[0023] Transparent polycarbonate (PC) material combines high optical properties, lightweight, and high impact resistance, making it the preferred material for high-impact transparent components. However, PC has poor abrasion resistance and its surface is easily scratched. Integrating a thin, monolithic PMMA cockpit transparent component's windshield area with PC, achieving partial lamination, and fully combining the advantages of PMMA (easy surface polishing and repair) and PC (weight reduction and load-bearing capacity), would effectively solve the aforementioned problems. Injection molding technology provides a novel approach and method for manufacturing such partially laminated polymer glass. It involves injecting an interlayer adhesive layer as a high-temperature molten flux between the two polymer glass layers to be laminated. After cooling and setting, a complete partially laminated glass is obtained. Because the interlayer melt can be filled according to the shape, the shape of the polymer glass is no longer limited to simple planes or small curved surfaces, but can be large-curvature or hypercurvature irregular structures or more complex shapes. In summary, this invention enables low-cost, high-efficiency manufacturing of high-optical-curvature polymer glass with partial lamination in specific areas.

[0024] In a first aspect, this application provides a partially laminated polymer glass, comprising: an outer layer, an inner layer, and an intermediate layer; the intermediate layer is disposed between the outer layer and the inner layer for laminating the outer layer and the inner layer; wherein the inner layer covers the inner surface of the outer layer, and the outer surface area of ​​the inner layer is less than or equal to the inner surface area of ​​the outer layer.

[0025] In one example, the surface area of ​​the inner layer of a partially laminated polymer glass is equal to the surface area of ​​the outer layer, and the surface area of ​​the intermediate layer is equal to the surface areas of the inner and outer layers, for laminating the outer and inner layers to form a laminated polymer glass.

[0026] In one example, the inner layer partially covers the inner surface of the outer layer; in other words, the surface area of ​​the inner layer is smaller than that of the outer layer. The inner layer is located in the area of ​​the outer layer that needs reinforcement. Local reinforcement is achieved by controlling the position and surface area of ​​the inner layer. The intermediate layer is located between the outer and inner layers and is used to laminate the inner layer onto the area that needs reinforcement.

[0027] It should be noted that the position and size of the lamination region of the inner and outer layers in this application can be selected as needed, as long as the principle of this application can be achieved.

[0028] In one example, the materials of the inner and outer layers independently include one or more of polymethyl methacrylate (PMMA), polycarbonate (PC), and polyamide (PA). The materials of the inner and outer layers can be the same or different, depending on the intended use of the laminated polymer glass. For example, the selection is based on the performance requirements of the specific application scenario (such as transparency, mechanical strength, heat resistance, etc.). PMMA has high transparency and good weather resistance, but relatively weak impact resistance. PC has strong impact resistance and high temperature resistance, making it suitable as an inner or outer layer requiring mechanical protection. PA is wear-resistant and chemically resistant, suitable for industrial protection or laminated structures in special environments. Multi-layer lamination, such as double-layer PMMA, can improve optical performance. Alternatively, a PC outer layer + PMMA inner layer can balance impact resistance and light transmission. This application allows for the selection of materials for the inner and outer layers as needed.

[0029] It should be noted that the materials of the inner and outer layers are not limited to only one or more of the materials mentioned above, but may also include other transparent polymers. Similarly, with technological advancements, any new laminated polymer glass suitable for this application can be developed to achieve the principles of this application.

[0030] In one example, the interlayer material includes one or more of polyvinyl butyral (PVB) and thermoplastic polyurethane (TPU). The interlayer is located in the laminated region between the outer and inner layers, and its material plays a crucial role in the laminated structure, directly affecting the mechanical strength, weather resistance, and adhesion of the polymer glass. PVB features high transparency, strong adhesion, and impact resistance, but has lower heat resistance (narrow operating temperature range) and its mechanical properties are easily affected by humidity. TPU has a low elastic modulus and strong energy absorption capacity, making it suitable for applications requiring adjustable thermal strain. It is often used as a flexible interlayer material, such as in non-structural transparent aerospace components or parts requiring dynamic loads.

[0031] Secondly, this application provides a method for preparing partially laminated polymer glass, applicable to the lamination of planar, curved, and irregularly shaped glass. It enables partial lamination of polymer glass without requiring surface grinding or polishing, fully leveraging the advantages of various material properties and improving the manufacturing efficiency and performance of polymer glass. The process flow diagram of this preparation method is shown below. Figure 1 As shown, it includes the following steps: Step S01: Apply protective films to the non-laminated areas of the outer and inner blanks, and install the outer and inner blanks into the moving and fixed mold cavities of the injection molding die, respectively.

[0032] In one example, the inner and outer blanks are designed to have complex surfaces, high curvature, high optical performance, and high surface quality. The outer and inner blanks are fabricated using thermoforming or injection molding, with the outer surface area of ​​the inner blank controlled to be less than or equal to the inner surface area of ​​the outer blank. It should be noted that the fabrication methods for the inner and outer blanks can also be other manufacturing methods capable of achieving high optical surface quality.

[0033] In one example, such as Figure 2 As shown, the dimensions of the outer and inner blanks can be larger than the net dimensions of the final partially laminated polymer glass. The excess areas are reserved for positioning lines and fixed clamping areas to facilitate positioning and other operations. Figure 2 (a) is the inner layer blank 1000. Figure 2 In section (b), the outer blank 2000 is shown. The outer surface area of ​​the inner blank 1000 is smaller than the inner surface area of ​​the outer blank 2000, and the net size area 10 of the inner blank 100 is smaller than the net size area 10 of the outer blank 2000. The excess portion outside the net size area 10 is the process margin 20, which has a positioning area 30, which can be a positioning line, positioning groove, and fixing clamping area. An injection port 40 is provided in the inner blank 1000. The outer blank 1000 and the inner blank 2000 of the polymer glass are positioned and fixed in the moving mold cavity and the fixed mold cavity of the injection molding die. This ensures accurate positioning and adhesion to the mold cavity surface during the lamination process, while also enabling smooth removal of the polymer glass after lamination. Positioning can be achieved through positioning lines, positioning grooves, positioning holes, etc.; installation and fixing can be achieved by machining a clamping area on the edge of the blank and fixing it with a pressure block, or by fixing it with high-temperature resistant tape.

[0034] like Figure 3 As shown, the overlapping portion of the inner layer blank 1000 and the outer layer blank 2000 is the laminated area, and the other portion is the non-laminated area. A protective film is affixed to the non-laminated area. The protective film includes one or more of thermoplastic polyurethane film (TPU), polyvinyl chloride film (PVC), or polyimide film (PI). It should be noted that the protective film affixed to the non-laminated area has the characteristics of being heat-resistant ≥140℃, or being able to withstand the flow of high-temperature intermediate layer material on its surface without damage for a short time (30s).

[0035] Step S02: Pre-close the injection molding die, inject molten intermediate layer material between the outer preform 2000 and the inner preform 1000 through the injection port 40, press, cool, and obtain a partially laminated polymer glass preform.

[0036] Specifically, before the pre-closing, the outer preform 2000 and the inner preform 1000 are heated. The heating method includes: heating the injection molding die to heat the corresponding outer and inner preforms using heat conduction; or heating the surfaces of the outer and inner preforms using infrared radiation. Only the surface of the preforms needs to be rapidly heated, eliminating the need for overall preform heating, which saves a significant amount of time, especially for thicker glass.

[0037] After pre-closing, a gap is maintained between the outer preform 2000 and the inner preform 1000 for the injection of molten intermediate layer material. The larger the gap between the outer and inner preforms, the easier it is for the intermediate layer material to flow, which is advantageous for the lamination of large-size glass. For example, the pre-closed injection molding die creates a closed space between the moving and fixed mold cavities. Simultaneously, the cavity gap between the moving and fixed mold cavities is greater than the theoretical thickness of the polymer glass, resulting in a gap between the outer and inner preforms of the polymer glass. This gap value is greater than 0 mm and less than or equal to 7 mm compared to the intermediate layer thickness of the polymer glass.

[0038] Specifically, after the molten interlayer material is poured in, the mold is pressed and cooled. In one example, the polymer glass is laminated by injecting the molten interlayer material at high temperature between the outer preform 2000 and the inner preform 1000, then applying pressure to the mold to completely close it, compressing the molten interlayer to densify it and obtain the final thickness, while simultaneously strengthening the adhesion between the interlayer and the outer and inner layers, thus achieving lamination between the outer preform 2000, the interlayer, and the inner preform 1000, resulting in a partially laminated polymer glass preform. The interlayer material can be PVB, TPU, or other polymer adhesive materials within the melting temperature range. The amount of injected interlayer material exceeds the actual amount required for the polymer glass interlayer; the excess interlayer material will be forcibly squeezed out into the non-laminated area during the pressing process. The clamping force applied during pressing should meet the requirement that the mold cavity pressure is ≥6MPa, where clamping force = cavity pressure * projected area of ​​the polymer laminated glass preform. In one example, after the molten interlayer material is poured and pressed, it must be cooled while maintaining high pressure. Appropriate temperature range for partially laminated polymer glass preforms during mold opening can effectively prevent defects such as vacuum bubbles and optical distortion caused by large shrinkage of the molten interlayer during cooling. For example, the cooling includes cooling to below 45°C while maintaining a cavity pressure ≥6MPa.

[0039] It should be noted that process parameters such as the amount of injected intermediate layer material, mold cavity pressure, and cooling conditions can be adjusted according to the actual production process, as long as the principles of this application are met.

[0040] Step S03: Post-process the partially laminated polymer glass preform to obtain partially laminated polymer glass. The post-processing includes removing the protective film and excess areas from the partially laminated polymer glass preform. The intermediate layer material overflowing into the non-laminated areas is cleaned, and excess areas of the partially laminated polymer glass preform are removed to obtain the final net dimensions. The high-temperature resistant protective film attached to the surface is peeled off to obtain the partially laminated high-optical-curvature polymer glass. The high-temperature resistant protective film effectively protects the polymer glass surface during lamination, preventing surface defects such as scratches and indentations caused by the mold, achieving high-optical-curvature forming with a flawless surface.

[0041] As can be seen, this invention uses a high-temperature resistant protective film to protect the surface of the polymer glass and the non-laminated areas, effectively preventing scratches, dents, or indentations on the glass surface caused by the mold during lamination. This preserves the original high optical surface quality of the polymer glass single-layer preform, eliminating the need for subsequent grinding and polishing repair. Simultaneously, it reduces mold requirements, eliminating the need for high-optical mirror surfaces like those required for injection molding molds for optical products / transparent parts, significantly saving mold costs. Furthermore, applying a protective film to the non-laminated areas of the preform's lamination surface prevents overflowing interlayer melt from directly adhering to the glass surface, enabling partial lamination. Additionally, this invention fills the gaps in the preform with high-temperature melt via injection, reducing the shape requirements of the polymer glass and making it suitable for laminating planar, curved, and irregularly shaped glass, especially high-optical curved polymer glass. After injection, the interlayer melt undergoes simultaneous high clamping force compression and cooling, ensuring the quality of the interlayer, eliminating defects such as vacuum bubbles and optical distortion, and completing the process in a very short time (≤1 hour), making it a highly efficient lamination method. In summary, the preparation method provided by this invention is more efficient and the polymer glass prepared is less expensive.

[0042] Example 1 In this embodiment, a partially laminated polymer glass is used, with an outer layer of PMMA (9mm thick), an inner layer of PC (9mm thick), and a middle layer of TPU (2mm thick), resulting in a total glass thickness of 20mm in the laminated area.

[0043] Prepare a high-optical-surface ...

[0044] A TPU film with a temperature resistance of 150℃ is conformally attached to the non-laminated surface and non-laminated area of ​​the laminated surface of the outer PMMA blank, and the non-laminated surface of the inner PC blank.

[0045] The outer PMMA preform with a high-temperature resistant protective film is positioned, installed, and fixed in the moving mold cavity of the injection molding die. The inner PC preform with the same high-temperature resistant protective film is positioned, installed, and fixed in the fixed mold cavity. The injection molding die is heated, and the preforms within the cavity are heated by the temperature of the mold cavity. The outer PMMA preform is heated to 60℃~70℃, and the inner PC preform is heated to 65℃~80℃. The injection molding die is pre-closed, forming a closed space between the moving and fixed mold cavities. The gap between the moving and fixed mold cavities is 5mm larger than the theoretical thickness of the polymer glass. Molten TPU intermediate layer material at 165℃ is injected between the outer PMMA preform and the inner PC preform. The amount of TPU injected is 120% of the actual amount required for the polymer glass intermediate layer. After the TPU melt is completely injected, a clamping force of 30000KN is applied to the injection molding die to compress the molten intermediate layer.

[0046] Initiate mold cooling while maintaining a clamping force of 30,000 kN throughout the cooling process. When the temperature of the partially laminated PMMA / TPU / PC glass preform inside the mold drops to 40°C, open the mold and remove the partially laminated PMMA / TPU / PC glass preform. Clean up any excess TPU material that has overflowed from the non-laminated areas. Simultaneously, use CNC machining to remove excess material from the partially laminated polymerized glass preform, obtaining the final net dimensions of the partially laminated PMMA / TPU / PC glass.

[0047] Peel off the high-temperature resistant TPU protective film attached to the surface to obtain a partially laminated high-optical-curvature PMMA / TPU / PC glass.

[0048] Example 2 In this embodiment, the outer layer is a 9mm thick PC, the inner layer is a 9mm thick PC, the middle layer is a 2mm thick TPU, and the total thickness of the glass in the laminated area is 20mm.

[0049] The preparation method includes: preparing an outer PC preform with a high optical surface area by injection molding, an inner PC preform with a high optical surface area by injection molding, the size of the inner PC preform being 1 / 2 the size of the outer PMMA preform, the preform size being 30mm~50mm larger than the net size of the final partially laminated polymer glass, and marking positioning lines and fixing clamping areas in the excess areas of the preform.

[0050] A TPU film with a temperature resistance of 150℃ is conformally attached to the non-laminated surface and non-laminated area of ​​the laminated surface of the outer PC blank, and the non-laminated surface of the inner PC blank.

[0051] The outer PC preform, coated with a high-temperature resistant protective film, is positioned, installed, and fixed in the moving mold cavity of the injection molding die. The inner PC preform, also coated with a high-temperature resistant protective film, is positioned, installed, and fixed in the fixed mold cavity. Infrared thermal radiation is used to rapidly heat both the outer and inner PC preforms, raising their temperatures to 75℃~90℃ and 75℃~90℃ respectively. The injection molding die is pre-closed, forming a closed space between the moving and fixed mold cavities. The gap between the moving and fixed mold cavities is 4mm larger than the theoretical thickness of the polymer glass. Molten TPU (TPU) material at 170℃ is injected between the outer and inner PC preforms. The amount of TPU injected is 150% of the actual amount required for the polymer glass interlayer. After the TPU melt is fully injected, a clamping force of 40,000 KN is applied to the injection molding die to compress the molten interlayer.

[0052] Initiate mold cooling while maintaining a clamping force of 40,000 kN throughout the cooling process. When the temperature of the partially laminated PC / TPU / PC glass preform inside the mold drops to 40°C, open the mold and remove the partially laminated PC / TPU / PC glass preform. Clean up any excess TPU material that has overflowed from the non-laminated areas. Simultaneously, use CNC machining to remove excess material from the partially laminated polymerized glass preform, obtaining the final net dimensions of the partially laminated PC / TPU / PC glass.

[0053] Peel off the high-temperature resistant TPU protective film attached to the surface to obtain a partially laminated high-optical-curvature PC / TPU / PC glass.

[0054] Comparative Example 1 In existing technologies, polymer glass is reinforced using a monolithic lamination method, meaning that the outer and inner preforms are of similar size. The existing technology prepares an outer layer of 9mm thick PMMA, an inner layer of 9mm thick PC, and a middle layer of 2mm thick TPU, resulting in a total laminated glass thickness of 20mm.

[0055] The preparation method includes: preparing an outer PMMA preform with a thickness of 9mm and an inner PC preform with a thickness of 9mm, the outer PMMA preform and the inner PC preform being roughly the same size. Positioning, installing, and fixing the outer PMMA preform and the inner PC preform within the cavities on both sides of a mold. Heating the mold and the preforms within the mold to the required temperature. Closing the mold, maintaining the interlayer gap between the outer PMMA preform and the inner PC preform. Injecting high-temperature molten interlayer TPU material between the outer PMMA preform and the inner PC preform. Cooling the mold and removing the PMMA / TPU / PC laminated glass.

[0056] Performance testing of partially laminated polymer glass The properties of the partially laminated polymer glass were tested. The weight of the glass material was determined using a precision weighing method. Bird strike resistance was tested according to GJB 2646A standard, evaluating its impact resistance through simulated bird strike experiments. Optical distortion was detected according to GJB 503 requirements, using a network projection system to measure the distortion of lines transmitted through the glass to quantify optical performance. Visual inspection was used to comprehensively evaluate surface defects and overall appearance quality. Specific test results are shown in Table 1.

[0057] Table 1. Test results of the properties of partially laminated polymer glass

[0058] As can be seen from Table 1, the locally laminated polymer glass provided in this application can select the materials of the inner, outer and intermediate layers according to the specific application scenario. The locally laminated polymer glass formed after local lamination achieves reinforcement in specific areas. Compared with the comparative example, it achieves the effect of overall weight reduction, while retaining high optical and high surface quality characteristics.

[0059] The above description does not provide detailed explanations of the technical aspects of each layer's patterning, etching, etc. However, those skilled in the art should understand that various technical means can be used to form layers and regions of the desired shape. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above. Additionally, although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination.

[0060] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A local layering polymer glass characterized by, The application relates to a method for manufacturing a partially laminated polymer glass, comprising: an outer layer, an inner layer and an intermediate layer; the intermediate layer is arranged between the outer layer and the inner layer for laminating the outer layer and the inner layer; wherein the inner layer covers a part of the inner surface of the outer layer.

2. The local laminated polymer glass according to claim 1, characterized in that, The materials of the inner layer and the outer layer respectively independently comprise one or more of polymethyl methacrylate, polycarbonate and polyamide.

3. The local laminated polymer glass of claim 1, wherein, The material of the intermediate layer comprises one or more of polyvinyl butyral and thermoplastic polyurethane.

4. A method of making a local layer lamination polymer glass, characterized by, The application further relates to a method for manufacturing a partially laminated polymer glass, comprising: step S01: attaching a protective film to the non-laminated area of an outer layer blank and an inner layer blank, and respectively installing the outer layer blank and the inner layer blank into the movable mold cavity and the fixed mold cavity of an injection-composite molding mold; step S02: pre-closing the injection-composite molding mold, pouring molten intermediate layer material between the outer layer blank and the inner layer blank, pressing, cooling and obtaining a partially laminated polymer glass blank; step S03: post-processing the partially laminated polymer glass blank to obtain a partially laminated polymer glass.

5. The preparation method according to claim 4, characterized in that, In step S01, the protective film comprises one or more of a thermoplastic polyurethane film, a polyvinyl chloride film or a polyimide film.

6. The preparation method according to claim 4, characterized in that, In step S01, the outer layer blank and the inner layer blank are prepared by hot forming or injection molding. During the preparation process, the outer surface of the inner layer blank is controlled to be less than or equal to the inner surface of the outer layer blank.

7. The production method according to claim 4, characterized by, In step S02, before pre-closing, the outer layer blank and the inner layer blank are heated, and the heating method comprises: heating the injection-composite molding mold to heat the corresponding outer layer blank and inner layer blank by heat conduction; or performing infrared radiation heating on the surface of the outer layer blank and the inner layer blank.

8. The preparation method according to claim 4, characterized in that, In step S02, after pre-closing, a gap is controlled to be left between the outer layer blank and the inner layer blank for pouring the molten intermediate layer material.

9. The preparation method according to claim 4, characterized in that, In step S02, the cooling comprises cooling to below 45 DEG C under the condition that the cavity pressure is kept greater than or equal to 6 MPa.

10. The method of claim 9, wherein, In step S03, the post-processing comprises removing the excess area of the partially laminated polymer glass blank and the protective film.

Images