Polyolefin packaging adhesive film, preparation method thereof and application thereof

Abstract

The invention discloses polyolefin packaging adhesive film, a preparation method of the polyolefin packaging adhesive film and application of the polyolefin packaging adhesive film. The packaging adhesive film is prepared, by weight, from the components of polymer resin including 1-60% of polyolefin X and 40-99% of polyolefin Y, and processing agent with the use level 0.1-5% of the weight of the polymer resin. A composition of the polyolefin packaging adhesive film has excellent optical performance and adhesive property of conventional ethylene-vinyl acetate copolymer (EVA) packaging adhesive film, cross bonding is not required, and the composition has thermoplasticity which can not be achieved by the conventional EVA packaging adhesive film, and the recycle of an assembly is favorable. Further, the composition has better ultraviolet aging resistance performance, water and vapor barrier performance and electrical performance than the conventional EVA packaging adhesive film.

Description

technical field [0001] The invention relates to a packaging adhesive film material and a preparation method thereof, in particular to a polyolefin packaging adhesive film, a preparation method and an application thereof. Background technique [0002] Solar energy is a green, non-polluting and inexhaustible energy source. Compared with other energy sources, solar energy is universal and can be used locally in most areas of the earth. Therefore, in the past ten years, the solar energy industry has become a The focus of the development of countries around the world. At present, it is mainly converted into electrical energy through solar panels, and then used for other purposes, such as street lights, refrigerators, electric vehicles, etc. [0003] Solar cells are generally used outdoors where the environment is relatively harsh. In order to prevent the output power of the module from being reduced due to air or water infiltrating into the module, the upper glass plate (front p...

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Problems solved by technology

However, it is limited by the properties of the polyolefin material itself: due to the general crystallinity of polyolefin materials, its light transmittance is low, at least it cannot be used for bonding between the front plate and the battery sheet; because polyolefin materials are non-polar resins, It has poor adhesion to polar materials and cannot provide high initial adhesion; if amorphous polyolefin materials are used, the light transmittance can reach a high level, but due to the loss of crystallinity and lower melting point of the material, it cannot be guaranteed Sufficient cohesive strength above 65°C, poor creep resistance, must be cross-linked for use, loses thermoplastic properties, and is not conducive to the recycling and reuse of components

[0010] For example, the patent WO2007US78845A describes the use of ethylene multi-block copolymers as encapsulation materials, and its example part mainly uses ethylene / 1-butene multi-block copolymers (POE / POP) as the matrix resin, grafted by maleic anhydride (MAH) And adding UV absorber and antioxidant, it has very excellent water vapor barrier performance and aging resistance, but its light transmittance test sample needs to be quenched to achieve a light transmittance of more than 90%. The role of quenching is to make the polymerization On the other hand, the lamination temperature is as high as 160°C when testing the bonding force with glass, which is much higher than that of the component factory. Commonly used lamination temperature

And from the perspective of the matrix resin used in this packaging material, its melting point can reach up to 120°C according to the ethylene content, but this melting point is the melting point of polyethylene, and the higher the ethylene content, the higher the crystallinity and the light transmission The lower the rate, the lower the ethylene content of the copolymer, otherwise its melting point will decrease, resulting in a decrease in thermomechanical properties, and it cannot guarantee sufficient cohesive strength above 65°C. The patent proposes a way to cross-link the polymer to solve the problem. This problem, thereby losing thermoplastic properties, is not conducive to the recycling and reuse of components

[0011] For example, patent WO2010067039A1 describes the use of polyethylene and various polyolefin blends containing functional groups as packaging materials, which exhibit excellent thermomechanical properties, but the polyethylene content in the blend is relatively large, which is sufficient to meet the requirements during use At the same time of cohesive strength, the light transmittance of the packaging material is greatly sacrificed, so it is not suitable for use between the battery element and the front glass in the module

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