Three-layer coextrusion material layer and preparation method thereof

Abstract

The invention discloses a three-layer coextrusion material layer and a preparation method thereof. The three-layer coextrusion material layer comprises an outer layer, an intermediate layer and an inner layer, wherein the intermediate layer is a PP material layer; the raw materials used for preparing the outer layer comprise the following components in percentage by mass: 0-100% of EVA (Ethylene Vinyl Acetate), 0-100% of TPE (Thermoplastic Polyethylene) and 0-100% of TPR (Thermoplastic Rubber); and raw materials for preparing the inner layer comprise the following components in percentage by mass: 0-100% of EVA (Ethylene Vinyl Acetate), 0-100% of TPE (Thermoplastic Polyethylene) and 0-100% of TPR (Thermoplastic Rubber). According to the invention, the PP material layer is used as an intermediate support layer; the three-layer co-extrusion material layer prepared by adopting the EVA, TPE, TPR and other material layers as a sealing layer is smooth in surface and good in elasticity; the three-layer co-extrusion material layer can be used for preparing a partition plate component in an electrodialysis device, when the electrodialysis partition plate is used, the outer layer and the inner layer between an upper partition plate and a lower partition plate which are adjacent to each other are attached to each other to directly form an anti-leakage ring, the sealing performance is good, the partition plate component can be recycled repeatedly, and the electrodialysis partition plate component is environmentally friendly.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a three-layer co-extrusion material layer and a preparation method thereof. Background technique [0002] Electrodialysis equipment is a kind of water treatment equipment, which mainly consists of polar plates, electrodes, ion exchange membranes, separators and clamping devices, etc. The separator is one of the main components of electrodialysis equipment, and its main function is to A certain gap is formed in the middle of the ion exchange membrane to form a compartment, which is used as a channel for the feed liquid during the electrodialysis operation. Therefore, a good partition should have good sealing performance to prevent the leakage of the feed liquid in the electrodialysis unit. The partitions of the existing electrodialysis devices are generally flat frame-plate structures. After many people in recent years In the research on the separator, the preparation process o...

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Problems solved by technology

Therefore, a good partition should have good sealing performance to prevent the leakage of the feed liquid in the electrodialysis unit. The partitions of the existing electrodialysis devices are generally flat frame-plate structures. After many people in recent years In the research on the separator, the preparation process of the electrodialysis separator is also innovative. CN 102921303 discloses an electrodialysis separator with a sealing line on the surface, and discloses that the plate frame is composed of a PP sheet and protruding sealing lines on both sides. That is, it enhances the sealability of the electrodialysis separator by adding a sealing line, which has the following disadvantages: the manufacturing process is relatively complicated and the cost is high

There is also a layer of anti-leakage coating directly on the frame of the partition, but this method will increase the process cost, and the coating will make the upper and lower partitions stick together, which cannot be recycled and reused.

At present, there is no specific report on the use of three-layer co-extruded material layers to make electrodialysis separators

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