Thermochromic polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA) film

Abstract

The invention discloses a thermochromic polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA) film. Thermochromic particles are added into the PVB or EVA film to prepare sandwich glass through an existing technology and equipment without the need of changing the existing machining process. Under sunlight irradiation, the film in the sandwich glass reflects the sunlight while changing color underheat, thereby achieving the effects of shading and reflecting the sunlight. The film can automatically recover to a transparent state when the light is darker without manual adjustment, and belongs to smart glass. Sun shades such as curtains do not need to be mounted additionally, and an electrode does not need to be mounted for applying voltage, so that manpower and material resources are saved.The thermochromic PVB or EVA film has the advantages of no need of maintenance, stable physical and chemical performance, good weather resistance, long service life, cost saving, and capability of truly realizing sun shading automation.

Description

technical field [0001] The invention relates to the field of film technology, in particular to a thermochromic PVB or EVA film. Background technique [0002] Laminated glass is widely used in everyday life, especially in construction and automotive fields. The laminated glass used in conventional buildings or automobiles will have two disadvantages in the case of sunlight: 1. Poor light-shielding performance. The light is directly irradiated through the laminated glass, which will cause glare and discomfort in the eyes, and it will shine on TV or computer images. Reflection is generated, causing the image to be unclear and affecting the use; when the car is in use, the penetrating light illuminates the driver, which increases the driving risk factor and leads to driving safety problems; usually the solution to this problem is to use a shield with sunshade function, such as Curtains, tarpaulins, etc., or coloring the glass, on the one hand, the cost is high, on the other han...

AI Technical Summary

Problems solved by technology

The laminated glass used in conventional buildings or automobiles will have two disadvantages in the case of sunlight: 1. Poor light-shielding performance. The light is directly irradiated through the laminated glass, which will cause glare and discomfort in the eyes, and it will shine on TV or computer images. Reflection is generated, causing the image to be unclear and affecting the use; when the car is in use, the penetrating light illuminates the driver, which increases the driving risk factor and leads to driving safety problems; usually the solution to this problem is to use a shield with sunshade function, such as Curtains, tarpaulins, etc., or coloring the glass, on the one hand, the cost is high, on the other hand, it needs manual operation, which is inconvenient to use

2. Due to the thermal radiation of the sun's rays, long-term exposure to light indoors or in cars will increase the temperature, which not only requires cooling equipment such as fans and air conditioners, but also increases energy consumption and cost, especially when the temperature inside the car is high, due to the atomization of oil and gas Cause the spontaneous combustion of the vehicle, causing personal or property damage

At present, there is a method of making an adhesive film by coating a heat-sensitive material layer by magnetron sputtering, but the manufacturing process is complicated, and it is easy to pack up when pasted on the glass, degumming and falling off, and the weather resistance is poor.

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