System for preparing anisotropic polymer product by photo-crosslinking in solid state

Abstract

The utility model discloses a system for preparing anisotropic polymer products through photo-crosslinking in a solid state, which comprises a printing platform used for placing solid resin raw materials and a photo-curing machine, the photo-curing machine is provided with a UV point light source, and the UV point light source is connected with a controller and used for enabling the UV point light source to move according to a preset track; the UV point light source is used for irradiating UV light beams to the surface of the solid resin raw material on the printing platform, so that the solid resin raw material is photo-crosslinked to form a polymer material with a target shape; and a polaroid which is connected with the controller and is used for realizing anisotropy of the polymer material is arranged between the UV point light source and the printing platform. The 3D printing device can be used for 2D and surface embossment type 3D printing with solid resin as a raw material, a UV point light source is used on a light curing machine, a rotatable polaroid is arranged in front of UV light, anisotropy of all areas can be achieved, and the characteristic cannot be achieved through laser engraving and body printing at present.

Description

Technical Field

[0001] The utility model relates to a system for preparing anisotropic polymer materials by photocrosslinking, and particularly relates to a system for preparing anisotropic polymer products by photocrosslinking in a solid state. Background Art

[0002] Currently, general laser engraving machines can cut and surface engrave (subtractive manufacturing) solid plastic sheets. Two-dimensional or three-dimensional plastic products can also be prepared by photocuring liquid resins (3D printing) (additive manufacturing). Since the body printers using liquid resins as raw materials require complex systems and are costly, they have not been truly commercialized yet. And the solid-state photocuring body printing is still in the conceptual stage.

[0003] In the field of planar processing, laser engraving machines have been standard processing equipment. Laser engraving machines are for subtractive manufacturing, and the raw materials are prefabricated sheets with a fixed thickness (generally, it is impossible to achieve any thickness or variable thickness at the processing site). The remaining materials after processing cannot be recycled immediately. Laser engraving can only process prefabricated materials and cannot process the materials into anisotropy. Summary of the Utility Model

[0004] Purpose of the Utility Model: The purpose of the utility model is to provide a system for preparing anisotropic polymer products by photocrosslinking in a solid state, which can achieve anisotropy of polymer products under the conditions of photocrosslinking in a solid state, and even anisotropy at each part of the product.

[0005] Technical Solution: The system for preparing anisotropic polymer products by photocrosslinking in a solid state according to the utility model includes a printing platform for placing solid resin raw materials and a photocuring machine. The photocuring machine is provided with a UV point light source, and the UV point light source is connected to a controller for moving the UV point light source along a predetermined trajectory; the UV point light source is used to irradiate a UV beam on the surface of the solid resin raw materials on the printing platform, so as to cause the solid resin raw materials to undergo photocrosslinking to form a polymer material with a target shape; a polarizer connected to the controller is arranged between the UV point light source and the printing platform for realizing the anisotropy of the polymer material.

[0006] Wherein, the polarizer is a rotatable UV polarizer, and the rotatable UV polarizer adjusts the polarization direction by rotating during the photocrosslinking process.

[0007] Wherein, a temperature control device for heating the solid resin raw materials is arranged on the printing platform.

[0008] Among them, a pressing plate area for pre-pressing the solid resin raw material into a shape before photocrosslinking is provided at the front end of the printing platform, and a separation area for separating the photocrosslinked part and the non-photocrosslinked part in the polymer material after photocrosslinking is provided at the rear end of the printing platform.

[0009] Among them, a conveying mechanism for conveying the separated non-crosslinked polymer material to the pressing plate area for re-photocrosslinking is provided between the outlet of the separation area and the inlet of the pressing plate area.

[0010] Among them, a roll pressing device for pressing the solid resin raw material to form a plate shape is provided in the pressing plate area; a separation device for separating the photocrosslinked part and the non-photocrosslinked part is provided in the separation area.

[0011] Among them, heating devices for heating the solid resin raw material or the product after photocrosslinking are provided in both the pressing plate area and the separation area. The heating device in the pressing plate area is used to heat the raw material to make it easy to deform and then press it through a template; the heating device in the separation area is used to heat the product to make the non-photocrosslinked part reach a flowing state and then be easily peeled off from the photocrosslinked part.

[0012] Among them, when a heating device is provided in the separation area, the separation device is a jitter device, and the jitter device is used to jitter the product when the non-photocrosslinked part is in a flowing state so as to separate the non-photocrosslinked part from the photocrosslinked part; when no heating device is provided in the separation area, the separation device is an ejecting mechanism, and the ejecting mechanism is used to eject the non-photocrosslinked part from the product to separate it from the photocrosslinked part.

[0013] Among them, a conveyor belt is provided between the outlet of the pressing plate area and the inlet of the separation area, and the printing platform is arranged on the conveyor belt and can move with the conveyor belt to send the pre-pressed solid resin raw material fed from the pressing plate area to the separation area after photocrosslinking.

[0014] Among them, a plurality of UV point light sources are provided in the direction perpendicular to the moving direction of the UV point light source above the printing platform; the UV point light sources are connected to a brake for controlling the movement of the UV point light sources; the brake is connected to a controller.

[0015] Advantages: Compared with the prior art, the present utility model has achieved the following remarkable effects: (1) The device of the present utility model can be used for 2D and surface-relief 3D printing with solid resin as the raw material. By using a UV point light source on a light curing machine and pre-setting a polarizer in front of the UV light, anisotropy in each area can be easily achieved, which is a characteristic that cannot be achieved by current laser engraving and volume printing. (2) Since the resin to be photocrosslinked is solid at room temperature, vibrations caused by the rapid movement of the platform loading the resin or the rapid movement of the laser part have little impact on the processing accuracy. The entire machine can be made simple, lightweight, and miniaturized. There is no need to consider vibration isolation, and it can even be used in environments with strong random vibrations, such as in a moving car or airplane, and can also be used for product processing in a space weightless environment. (3) Due to the planar layout, multiple UV light sources can be used for synchronous processing, greatly improving the processing speed. (4) Currently, most volume printing methods use a moving light source because they use liquid raw materials; while volume printing in the solid state is still only in the conceptual stage; the present utility model can achieve anisotropic printing under solid conditions and can realize pipeline processing by moving the platform. (5) Compared with volume printing, it is a high-cost-performance high-speed light curing system; compared with laser engraving, the raw material is solid at room temperature and can be pre-pressed to the required thickness and surface pattern; compared with volume printing and laser engraving, the prepared material can be anisotropic in each area; compared with laser engraving, the un-photocrosslinked part can be separated after heating or can be mechanically separated without heating and then immediately continue to be used. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a top view of the structure of the present utility model including a pressing plate area and a separation area;

[0018] Figure 3 is a side view of the structure of the present utility model including a pressing plate area and a separation area;

[0019] Figure 4 is a schematic structural diagram of the raw material to be processed of the present utility model;

[0020] Figure 5 is a curve graph showing the relationship between the storage modulus at room temperature and the polarizer angle measured by dynamic mechanical analysis after photocrosslinking at different polarizer angles. Detailed Embodiments

[0021] The technical solution of the present utility model will be further described below in conjunction with the drawings in the specification.

[0022] As Figures 1-3As shown in the figure, the present utility model provides a system for preparing anisotropic polymer products by photo-crosslinking in the solid state, including a printing platform 2 for placing a solid resin raw material 5 and a light curing machine; the light curing machine is provided with a UV point light source 1, and the UV point light source 1 is connected to a controller (not shown in the figure) for moving the UV point light source 1 along a predetermined trajectory; the UV point light source 1 is used to irradiate a UV beam 4 on the surface of the solid resin raw material 5 on the printing platform 2, so that the solid resin raw material 5 undergoes photo-crosslinking to form a polymer material with a target shape; a polarizer 3 connected to the controller is provided between the UV point light source 1 and the printing platform 2 for realizing the anisotropy of the polymer material.

[0023] The raw material used for processing in the present utility model is a photo-crosslinkable solid resin, and the photo-crosslinkable solid resin is in a solid state at room temperature before crosslinking. The polarizer 3 in this embodiment is a rotatable UV polarizer. During the photo-crosslinking process, the polarizer 3 can change the polarization direction by rotation to achieve different anisotropies at different locations. In this embodiment, a plurality of UV point light sources are provided in a direction perpendicular to the moving direction of the UV point light source above the printing platform; the UV point light source 1 is connected to a brake 8 for controlling the movement of the UV point light source; the brake 8 is connected to the controller.

[0024] On the printing platform 2 of this embodiment, there is a temperature control device (not shown in the figure) for heating the solid resin raw material 5; the printing platform 2 is a movable platform. At the moving front end of the printing platform 2, there is a pressing plate area 6 for pre-forming the solid resin raw material 5 before photocrosslinking. At the moving rear end of the printing platform 2, there is a separation area 7 for separating the photocrosslinked part and the non-photocrosslinked part in the polymer material after photocrosslinking. In this embodiment, a conveyor belt 10 is provided between the outlet of the pressing plate area 6 and the inlet of the separation area 7. The start-stop mechanism of the conveyor belt 10 is connected to the controller; the printing platform 2 is arranged on the conveyor belt 10 and can move with the conveyor belt 10 to send the pre-pressed solid resin raw material 5 sent from the pressing plate area 6 to the separation area 7 after photocrosslinking. In the pressing plate area 6 of this embodiment, there is a roll pressing device (not shown in the figure) for pressing the solid resin raw material to form a plate shape; the separation area 7 is provided with a separation device for separating the photocrosslinked part from the non-photocrosslinked part. Both the pressing plate area 6 and the separation area 7 are provided with heating devices (not shown in the figure) for heating the solid resin raw material or the product after photocrosslinking. The heating device in the pressing plate area 6 is used to heat the raw material to make it easy to deform and then press it through a template; the heating device in the separation area 7 is used to heat the product to make the non-photocrosslinked part reach a flowing state and then be easily peeled off from the photocrosslinked part. When the separation area 7 is provided with a heating device, the separation device is a shaking device, and the shaking device is used to shake the product when the non-photocrosslinked part is in a flowing state to separate the non-photocrosslinked part from the photocrosslinked part; when the separation area 7 is not provided with a heating device, the separation device is an ejecting mechanism, and the ejecting mechanism is used to eject the non-photocrosslinked part from the product to separate it from the photocrosslinked part. A conveying mechanism 11 is provided between the outlet of the separation area 7 and the inlet of the pressing plate area 6 for conveying the separated non-crosslinked polymer material to the pressing plate area 6 for re-photocrosslinking. The photocrosslinked part and the non-photocrosslinked part are separated by mechanical means at room temperature or after heating to make the non-photocrosslinked part have fluidity. The separated non-photocrosslinked part is pressed at room temperature or high temperature and then returns to a solid state at room temperature for continued use.

[0025] As one specific example, as Figure 4 shown in (a) of [reference], a 20 cm x 20 cm x 2.1 mm plate pre-pressed and extruded is used as the solid resin raw material 5, and the device of the present utility model is used for photocrosslinking to prepare an anisotropic polymer product. Among them, during the photocrosslinking process, the relative angle of the polarizer is adjusted to prepare a polymer product with anisotropy in each region.

[0026] As one specific example, as Figure 4As shown in (b) therein, after preheating and pressing a pattern on the surface of a 2.15-mm-thick sheet to obtain the solid resin raw material 5, the anisotropic polymer product is prepared by photocrosslinking using the device of the present utility model. During the photocrosslinking process, the angle of the UV polarizer remains unchanged. After completion, the un-photocrosslinked part is removed by heating to prepare an anisotropic star product.

[0027] As one specific example, after a sheet with a width of 100 mm and a thickness of 1.5 mm is pressed, it moves at a speed of 1 mm / s to 10 mm / s and is locally crosslinked when passing through four UV point light sources that can move within a 25 mm x 25 mm area respectively. A rotatable polarizer is arranged under each UV point light source. After UV treatment, the photocrosslinked part is peeled off from the un-photocrosslinked part by mechanical means. The un-photocrosslinked part is transported back to the starting position and remolded into a sheet with a width of 100 mm and a thickness of 1.5 mm. This process can achieve mass production on an assembly line.

[0028] As one specific example, the material with the model number 4504 of Guangzhou Tianze New Material Technology Co., Ltd. is mixed with thermoplastic polyurethane at high temperature and then flattened, placed on a temperature control table at 55 °C to maintain a non-crystalline fully transparent state, and then photocrosslinked to prepare a product approximately in the shape of a C.

[0029] Figure 5 For the relationship between the storage modulus at room temperature and the polarizer angle measured by dynamic mechanical analysis after photocrosslinking at different polarizer angles with other identical photocrosslinking parameters. The raw material used is a photocurable resin that is solid at room temperature, sourced from Hongguang (Guangzhou) New Material Technology Co., Ltd., H1106. From Figure 5 It can be seen that within the range of 0° - 90°, whether using a common polarizer or a UV polarizer, the maximum change in the storage modulus can reach approximately 25%.

Claims

1. A system for preparing anisotropic polymer products by photocrosslinking in the solid state, characterized in that: The invention comprises a printing platform (2) for placing a solid resin raw material (5), and a light curing machine, wherein the light curing machine is provided with a UV point light source (1), and the UV point light source (1) is connected to a controller for moving the UV point light source (1) according to a predetermined track; the UV point light source (1) is used to irradiate a UV light beam onto the surface of the solid resin raw material (5) on the printing platform (2), thereby photo-crosslinking the solid resin raw material (5) to form a polymer material having a target shape; and a polarizing plate (3) connected to the controller for realizing anisotropy of the polymer material is provided between the UV point light source (1) and the printing platform (2).

2. The system for preparing anisotropic polymer products by photocrosslinking in the solid state according to claim 1, characterized in that: The polarizer (3) is a rotatable UV polarizer, and the rotatable UV polarizer adjusts the polarization direction by rotating during the photo-crosslinking process.

3. The system for preparing anisotropic polymer products by photocrosslinking in the solid state according to claim 1, characterized in that: The printing platform (2) is provided with a temperature control device for heating the solid resin raw material (5).

4. The system for preparing anisotropic polymer products by photocrosslinking in the solid state according to claim 1, characterized in that: The printing platform (2) is a movable platform, and the movable front end of the printing platform (2) is provided with a pressing plate area (6) for pre-pressing the solid resin raw material before photo-crosslinking, and the movable rear end of the printing platform (2) is provided with a separation area (7) for separating the photo-crosslinked part and the non-photo-crosslinked part in the polymer material after photo-crosslinking.

5. The system for preparing anisotropic polymer products by photocrosslinking in the solid state according to claim 4, characterized in that: A conveying mechanism (11) is provided between the outlet of the separation zone (7) and the inlet of the pressing plate zone (6) for conveying the separated uncrosslinked polymer material to the pressing plate zone for re-photocrosslinking.

6. The system for preparing anisotropic polymer products by photocrosslinking in the solid state according to claim 4, characterized in that: The pressing plate area (6) is provided with a roller pressing device for pressing the solid resin raw material into a plate shape; the separation area (7) is provided with a separation device for separating the photo-crosslinked part from the non-photo-crosslinked part.

7. The system for preparing anisotropic polymer products by photocrosslinking in the solid state according to claim 6, characterized in that: The pressing plate area (6) and the separation area (7) are both provided with a heating device for heating the solid resin raw material or the photo-crosslinked product. The heating device of the pressing plate area (6) is used to heat the raw material so that it is easy to deform and then press it through the template; the heating device of the separation area (7) is used to heat the product so that the non-photo-crosslinked part reaches a fluid state and is easy to peel off from the photo-crosslinked part.

8. The system for preparing anisotropic polymer products by photocrosslinking in the solid state according to claim 6, characterized in that: When the separation zone (7) is provided with a heating device, the separation device is a shaking device, and the shaking device is used to shake the product when the non-photo-crosslinked part is in a flowing state, thereby separating the non-photo-crosslinked part from the photo-crosslinked part; When the separation zone (7) is not provided with a heating device, the separation device is an ejection mechanism, and the ejection mechanism is used to eject the non-photo-crosslinked portion from the product and separate it from the photo-crosslinked portion.

9. The system for preparing anisotropic polymer products by photocrosslinking in the solid state according to claim 4, characterized in that: A conveyor belt (10) is provided between the outlet of the pressing plate area (6) and the inlet of the separation area (7). The printing platform (2) is provided on the conveyor belt (10) and can move with the conveyor belt (10) to deliver the pre-pressed solid resin raw material (5) fed from the pressing plate area (6) to the separation area (7) after photo-crosslinking.

10. The system for preparing anisotropic polymer products by photocrosslinking in the solid state according to claim 1, characterized in that: A plurality of UV point light sources (1) are arranged above the printing platform (2) in a direction perpendicular to the moving direction of the UV point light source (1); the UV point light source (1) is connected to a brake (8) for controlling the planar movement of the UV point light source (1); and the brake (8) is connected to a controller.

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