Preparation method of intermediate infrared transparent visible light high-reflection film
By mixing substrates such as polyethylene with auxiliary materials such as SEBS rubber powder, a mid-infrared transparent visible light high-reflection film is prepared, which solves the problems of complex preparation of existing materials and low reflectivity, and achieves high reflectivity, environmentally friendly and economical film preparation.
Patent Information
- Application Number
- CN202411690283.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-03-07
AI Technical Summary
The existing mid-infrared transparent visible light high reflective materials have the disadvantages of low partial reflectivity of visible light, complex preparation process, difficult to prepare on a large area, expensive, harmful to the human body and unrecyclable.
Polyethylene or its substrate is mixed with auxiliary materials such as SEBS rubber powder, and transparent films are prepared by screw extruder and melt pressing process, and auxiliary materials are removed by dissolving solution to obtain a film with high reflection of mid-infrared transparent visible light.
The film has a high reflectivity in the visible part, the preparation process is simple, can be prepared on a large scale, is cheap, green and environmentally friendly, and is harmless and recyclable to the human body.
Smart Images
Figure CN119570084A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of smart materials and devices, and in particular to a method for preparing a mid-infrared transparent and highly reflective visible light film. Background Art
[0002] As the second skin of the human body, clothing plays an indispensable role in human production and survival, achieving both beauty and practicality. In recent years, due to the development of society, outdoor special operations have become more frequent, especially working in high temperature environments in summer, which can cause heat stroke in workers, leading to heat exhaustion, heat stroke, etc. At the same time, in the context of global warming, outdoor heat stress poses a greater threat to health and economy. Therefore, outdoor cooling is necessary in many aspects of sustainable social development, but due to its openness, unlike the easily regulated temperature of indoor spaces, it is impractical and uneconomical to use energy-intensive heating, ventilation and air-conditioning systems to cool the huge open space of the outdoor environment. In this case, an ideal solution is to locally cool the human body through clothing.
[0003] On the one hand, mid-infrared transparent visible light high reflective materials have the characteristics of high transmittance in the mid-infrared band (7-14 μm), which coincides with the peak thermal radiation band of the human body. The human body can pass through the material and emit thermal radiation into the environment. On the other hand, they have high reflectivity in the visible light band (340-800 nm), which can minimize the heating of the human body by sunlight and achieve the purpose of cooling the human body. The existing materials of this type generally have the disadvantages of low reflectivity in the visible light part, complex preparation process, difficulty in large-scale preparation, high price, harmful to the human body and non-recyclable. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a method for preparing a mid-infrared transparent and highly reflective film for visible light in view of the defects involved in the background technology.
[0005] The present invention adopts the following technical solutions to solve the above technical problems: A method for preparing a mid-infrared transparent and highly reflective film comprising the following steps: Step 1), the base material and the auxiliary material are mixed evenly to obtain a film raw material; the base material is any one of polyethylene, polypropylene, and polyamide particles; the auxiliary material is any one of SEBS rubber powder, PEO powder, PVA powder, PAA powder, ZnSO4 inorganic salt powder, NaCl inorganic salt powder, and MgCl2 inorganic salt powder; Step 2), feeding the film raw material into a screw extruder, melting and mixing the base material and the auxiliary material through three-stage heating, and obtaining a strip raw material after cooling; Step 3), dividing the strip raw material into particles; Step 4), the particles are melt-pressed to obtain a transparent film; Step 5), placing the obtained transparent film into a dissolving solution to dissolve the auxiliary material. When the auxiliary material is SEBS rubber powder, the dissolving solution is n-hexane; when the auxiliary material is PEO powder, PVA powder, PAA powder, ZnSO4, NaCl, MgCl2 water-soluble inorganic salt powder, the dissolving solution is water; Step 6), drying the transparent film after the auxiliary material is dissolved to obtain a film that is transparent to mid-infrared and highly reflective to visible light.
[0006] According to a further optimization scheme of the method for preparing a mid-infrared transparent and highly reflective film according to claim 1, the base material and the auxiliary material are evenly mixed by ball milling or manual mixing.
[0007] According to a further optimization scheme of the method for preparing a mid-infrared transparent and highly reflective film according to claim 1, when the particles are melt-pressed in step 4), any one of hot pressing and roller pressing is adopted.
[0008] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects: 1. The auxiliary materials are removed by solution, and the film has high reflectivity in the visible light part; 2. By using different ratios of base material and auxiliary materials, films with different visible reflectivity can be obtained; 3. The preparation process is simple, can be prepared on a large scale, is low-cost, and is green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a schematic diagram of the preparation process of the present invention; Figure 2 It is a comparative schematic diagram of the reflectivity in the ultraviolet-visible-near infrared spectrum (0.34-2 µm) and the transmittance in the mid-infrared spectrum (2.5-18 µm) measured by the integrating sphere of the present invention. DETAILED DESCRIPTION
[0010] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings: The present invention can be implemented in many different forms and should not be considered to be limited to the embodiments described herein. On the contrary, these embodiments are provided to make this disclosure thorough and complete, and will fully express the scope of the present invention to those skilled in the art. In the accompanying drawings, components are enlarged for clarity.
[0011] like Figure 1 As shown, the present invention discloses a method for preparing a mid-infrared transparent and highly reflective film, comprising the following steps: Step 1), the base material and the auxiliary material are mixed evenly to obtain a film raw material; the base material is any one of polyethylene, polypropylene, and polyamide particles; the auxiliary material is any one of SEBS rubber powder, PEO powder, PVA powder, PAA powder, ZnSO4 inorganic salt powder, NaCl inorganic salt powder, and MgCl2 inorganic salt powder; Step 2), feeding the film raw material into a screw extruder, melting and mixing the base material and the auxiliary material through three-stage heating, and obtaining a strip raw material after cooling; Step 3), dividing the strip raw material into particles; Step 4), the particles are melt-pressed to obtain a transparent film; Step 5), placing the obtained transparent film into a dissolving solution to dissolve the auxiliary material. When the auxiliary material is SEBS rubber powder, the dissolving solution is n-hexane; when the auxiliary material is PEO powder, PVA powder, PAA powder, ZnSO4 inorganic salt powder, NaCl inorganic salt powder, MgCl2 inorganic salt powder, the dissolving solution is water; Step 6), drying the transparent film after the auxiliary material is dissolved to obtain a film that is transparent to mid-infrared and highly reflective to visible light.
[0012] The base material and the auxiliary material are mixed evenly by ball milling or manual method. When the particles are melted and pressed, any one of hot pressing and roller pressing is adopted. After the solute is precipitated at low temperature, the dissolved solution can be reused. Example
[0013] Step 1), PE and SEBS are mixed uniformly by ball milling in a ratio of 4:6 to obtain a uniform film raw material; Step 2), the completely mixed raw materials are put into a screw extruder, and PE and SEBS are melt-mixed by three-stage heating (150°C, 160°C, 170°C), and strip raw materials are obtained after cooling; Step 3), dividing the material prepared in step 2) into particles of about 1 cm; Step 4), the particles are hot pressed at 170°C and a pressure of 10 MPa for 20 minutes; Step 5), the film prepared in step 4) is placed in n-hexane and subjected to ultrasonic treatment at 60°C for 1.5 hours; Step 6), drying the film prepared in step 5) to obtain a film that is mid-infrared transparent and highly reflective to visible light. Example
[0014] Step 1), PE and SEBS are mixed uniformly by ball milling in a ratio of 3:7 to obtain a uniform film raw material; Step 2), the completely mixed raw materials are put into a screw extruder, and PE and SEBS are melt-mixed by three-stage heating (150°C, 160°C, 170°C), and strip raw materials are obtained after cooling; Step 3), dividing the material prepared in step 2) into particles of about 1 cm; Step 4), the particles are hot pressed at 170°C and 15 MPa for 20 minutes; Step 5), the film prepared in step 4) is placed in n-hexane and subjected to ultrasonic treatment at 60°C for 1.5 hours; Step 6), drying the film prepared in step 5) to obtain a film that is mid-infrared transparent and highly reflective to visible light. Example
[0015] Step 1), PE and SEBS are mixed uniformly by ball milling in a ratio of 4:6 to obtain a uniform film raw material; Step 2), the completely mixed raw materials are put into a screw extruder, and PE and SEBS are melt-mixed by three-stage heating (150°C, 160°C, 170°C), and strip raw materials are obtained after cooling; Step 3), dividing the material prepared in step 2) into particles of about 1 cm; Step 4), the particles are hot pressed at 170°C and 15 MPa for 20 minutes; Step 5), the film prepared in step 4) is placed in n-hexane and treated in a water bath at 60°C for 2 hours; Step 6), drying the film prepared in step 5) to obtain a film that is mid-infrared transparent and highly reflective to visible light. Example
[0016] Step 1), PE and SEBS are mixed uniformly by ball milling in a ratio of 4:6 to obtain a uniform film raw material; Step 2), the completely mixed raw materials are put into a screw extruder, and PE and SEBS are melt-mixed by three-stage heating (150°C, 160°C, 170°C), and strip raw materials are obtained after cooling; Step 3), dividing the material prepared in step 2) into particles of about 1 cm; Step 4), the particles are rolled and heated at 170 °C to prepare a film with a size of 10 cm × 2 m; Step 5), the film prepared in step 4) is placed in n-hexane and subjected to ultrasonic treatment at 60°C for 1.5 hours; Step 6), drying the film prepared in step 5) to obtain a film that is mid-infrared transparent and highly reflective to visible light. Example
[0017] Step 1), PE and PEO are mixed uniformly by ball milling in a ratio of 4:6 to obtain a uniform film raw material; Step 2), the completely mixed raw materials are put into a screw extruder, and PE and PEO are melt-mixed by three-stage heating (150°C, 160°C, 170°C), and strip raw materials are obtained after cooling; Step 3), dividing the material prepared in step 2) into particles of about 1 cm; Step 4), the particles are hot pressed at 170°C and 15 MPa for 20 minutes; Step 5), placing the film prepared in step 4) in water and subjecting it to ultrasonic treatment at 60°C for 0.5 hours; Step 6), drying the film prepared in step 5) to obtain a film that is mid-infrared transparent and highly reflective to visible light.
[0018] Figure 2 The figure is a comparative schematic diagram of the reflectivity in the UV-visible-near infrared spectrum (0.34-2 µm) and the transmittance in the mid-infrared spectrum (2.5-18 µm) measured by the integrating sphere of the present invention. The left figure is the AM 1.5G solar spectrum, and the right figure is the atmospheric transmittance for reference. It can be seen that the film made by the present invention has a high reflectivity in the visible light part.
[0019] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.
[0020] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A method for preparing a mid-infrared transparent and highly reflective film, characterized in that: The steps include: Step 1), the base material and the auxiliary material are mixed evenly to obtain a film raw material; the base material is any one of polyethylene, polypropylene, and polyamide particles; the auxiliary material is any one of SEBS rubber powder, PEO powder, PVA powder, PAA powder, ZnSO4 inorganic salt powder, NaCl inorganic salt powder, and MgCl2 inorganic salt powder; Step 2), feeding the film raw material into a screw extruder, melting and mixing the base material and the auxiliary material through three-stage heating, and obtaining a strip raw material after cooling; Step 3), dividing the strip raw material into particles; Step 4), the particles are melt-pressed to obtain a transparent film; Step 5), placing the obtained transparent film into a dissolving solution to dissolve the auxiliary material. When the auxiliary material is SEBS rubber powder, the dissolving solution is n-hexane; when the auxiliary material is PEO powder, PVA powder, PAA powder, ZnSO4 inorganic salt powder, NaCl inorganic salt powder, MgCl2 inorganic salt powder, the dissolving solution is water; Step 6), drying the transparent film after the auxiliary material is dissolved to obtain a film that is transparent to mid-infrared and highly reflective to visible light.
2. The method for preparing a mid-infrared transparent and highly reflective film according to claim 1, characterized in that: The base material and the auxiliary material are mixed uniformly by ball milling or manually.
3. The method for preparing a mid-infrared transparent visible light high-reflection film according to claim 1, characterized in that: In the step 4), when the particles are melt-pressed, any method of hot pressing or roller pressing is adopted.