A kind of gradient distribution two-component glass fiber filter paper and preparation method thereof

Abstract

A gradient distribution two-component glass fiber filter paper, characterized in that the filter paper is composed of 2 to 10 layers of two-component glass fiber layers with a thickness of 0.03 to 2.0mm, wherein from the first layer to the last layer The average fiber diameter of the two-component glass fiber layer increases uniformly from 0.4 μm to 5 μm in a gradient. Glass formed. The invention also discloses a method for preparing a gradient distribution two-component glass fiber filter paper, which is characterized in that it includes the following steps: (1) arranging 2 to 6 groups of gradient kilns; Melting separately; (3) using flame jet drawing, the flame temperature of the latter gradient kiln injection is 30°C higher than that of the previous gradient, and the air velocity is increased by 50m / s compared with the previous gradient; (4) collecting cotton; (5 ) roll pressing; (6) heat setting. The beneficial effects of the present invention are: ① cost saving; ② high filtration efficiency; ③ high temperature resistance.

Description

technical field [0001] The invention relates to a filter material and a preparation method thereof, in particular to a gradient distribution two-component glass fiber filter paper and a preparation method thereof. Background technique [0002] The energy-saving and environmental protection industry is the first among the seven emerging industries. During the "Twelfth Five-Year Plan" period, the waste incineration industry will develop greatly. With the increase of waste incineration, the demand for bag filter and filter materials will also increase. . In particular, the development of filter materials with characteristics such as high temperature resistance, corrosion resistance, and low resistance has been encouraged by the state. In order to improve the atmospheric environment, especially the harm of tiny particles to the human body, the state plans to establish a "air special project". According to the historical statistical data of China's high-temperature filter mater...

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Problems solved by technology

[0003] In the filtration and purification process, the filter material is a commonly used filter element in the purification process, but the traditional filter material is a single layer, and the filter element has a single pore size, which cannot meet the unity of processing capacity and processing accuracy, so people use composite filter material technology. Combine two or more filter materials with different precision to achieve a balance between processing capacity and processing accuracy

[0004] The Chinese patent with the patent number CN200910043469.2 proposes a titanium filter element with gradient pore structure and its preparation method. Titanium powder, titanium hydride powder, sodium chloride powder are mixed uniformly and then mixed with binder to granulate, and powder co-injection molding technology is adopted. , the core part is injected first, and then the outer layer is injection-molded. The feeding materials of the two injection moldings are different. After the injection molding is degreased, desalted and sintered, the product is obtained. This invention solves the problem of core / shell pore structure control and The problem of bonding strength is to achieve high interface bonding strength and controllable pore structure (the porosity and pore size of the core / shell layer can be controlled between 30-70 and 1400), but because titanium is a rare metal, the cost is high , it is more difficult to promote, and at the same time, the metal filter element is not easy to control during the preparation and sintering process, and the uniformity of the pore size is low

[0005] The Chinese patent with the patent number CN 201020301426.8 designed a gradient filtration composite melt-blown filter element, which solves the technical problems that the general single-layer filter element has a single pore size, cannot meet the requirements of processing capacity and processing accuracy at the same time, and has a short service life of the filter element; at the same time, it solves the technical problems of gradient pores Structural titanium filter element has the disadvantages of high cost, difficult processing, and low pore size uniformity, and provides a gradient filtration composite melt-blown filter element with good filtering effect, long filter element life, uniform filter pore size, and low processing cost

However, the layers of filter materials need to be bonded with adhesives. Not only the bonding performance between the layers is weak, it is easy to fall off, and the service life of the filter materials is reduced, but also the overall high temperature resistance of the filter element is reduced.

[0006] The Chinese patent with the patent number CN 201220360483.2 designed a multi-layer gradient filter composite fabric to solve the problem that the traditional multi-layer filter fabric not only has complicated manufacturing process and high production cost, but also the surface layer is easy to be blocked in the practical process, and the filtration efficiency and filtration accuracy are low. The problem of short service life, but the filter material is composed of microporous hollow PPS monofilament filter cloth and at least two layers of high-temperature-resistant polymer monofilament filter cloth in order of decreasing diameter of the monofilament, so that the filter material cannot be used in High temperature field

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