A kind of preparation method of composite filter element and composite filter element

Abstract

The invention relates to a filtering element, in particular to a preparation method of a composite filtering element and a composite filtering element. The preparation method comprises the following steps: a, preparing a first filtering element and a second filtering element having a filtering surface and a plane and different in size; b: preparing at least one reinforcing material layer; and c, fixing the reinforcing material layer prepared in step b between the planes of the first filtering element and second filtering element prepared in step a by virtue of plane welding or plane hot melting or plane cold adhesion. By adopting the preparation method of the composite filtering element provided by the invention, the concept of the traditional process is thoroughly changed, and the technical difficulty of the contradiction between the strength and elasticity / toughness of the conventional filtering element which cannot be solved at present can be solved. The composite filtering elementprepared in the preparation method provided by the invention not only can improve the strength of the filtering element in a geometrical progression manner, and can reduce the deformation, but also can ensure the elasticity and toughness of the filtering element, and can thoroughly overcome the problem that the reinforced filtering element is likely to break and crack.

Description

technical field [0001] The invention relates to a filter element, in particular to a preparation method of a composite filter element and the composite filter element. Background technique [0002] With the continuous upgrading of environmental protection, chemical industry, mining, and food industries, the requirements for solid-liquid separation are also increasing. In the process of solid-liquid separation, filter elements are inseparable. With the continuous improvement of solid-liquid separation requirements, the indirect requirements for filter separation elements are also getting higher and higher. In the selection process of filter elements, high-quality thermoplastics are mostly used as raw materials for filter elements. However, simply using thermoplastics as raw materials will result in insufficient strength of the filter element, excessive deformation, and uneven thickness of the filter cake. In order to make the filter element meet the requirements of filtratio...

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Problems solved by technology

However, during the preparation process, these reinforcing materials are directly mixed into the polypropylene raw material in disorder, and the reinforcing effect will be uneven due to the disordered arrangement of the reinforcing materials in the raw material; in addition, in the subsequent heating, melting and cooling process Due to the migration of reinforcing materials, the uniformity of filter element strength will also be further reduced

At the same time, due to the disordered distribution of the added reinforcing material in the thermoplastic, although the strength of the filter element is enhanced, it also makes the filter element harder and more brittle. When the filtration pressure difference exceeds the yield stress of the filter element, it will Causes extensive damage to filter elements

[0003] At present, in the production process of filter elements produced by reinforced plastics, there is no controllable way to produce a preparation method that not only ensures the strength of the filter element, but also ensures the elasticity of the filter element

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