CN202136879U - Filter material coated with basalt fiber - Google Patents

Abstract

The utility model relates to a filter material coated with basalt fiber, which is formed in a way that a layer of basalt fiber bulked yarn base cloth coated with fluorine containing substance is compounded with a PTFE (Polytetrafluoroethylene) film. The filter material coated with the basalt fiber can be used in the temperature of 300 DEG C for a long time and has the filter efficiency up to 99.995 percent for dust less than 1mum.

Description

Basalt fiber coated filter material

technical field

The utility model relates to an ultra-high temperature, corrosion-resistant high-performance film-coated filter material in the high-temperature flue gas filtration industry, in particular to a basalt fiber film-coated filter material. the

Background technique

With the development of industry, the working conditions of the high-temperature flue gas filtration industry are becoming more and more complex and diverse. In the face of harsh working conditions, how to perform high-efficiency filtration while ensuring and prolonging the service life of filter bags, ensuring filtration efficiency, and achieving the purpose of environmental protection is a problem. A long-term project is required. the

The base material of the existing high-temperature filter material is mainly glass fiber fabric or a mixed fabric of glass fiber and other fibers, and the maximum service temperature is 250°C. In addition, there are needle-punched felts made of chemical fibers such as aramid fiber and acrylic with low temperature. , the use temperature does not exceed 200 ℃. the

Contents of the invention

The purpose of this utility model is to provide a basalt fiber film-coated filter material with high temperature resistance and corrosion resistance, in order to solve the problems of high temperature of smoke and dust, complex components, short service life of filter material and low filtering effect in some high temperature flue gas filtration industries. question. the

After research, the applicant found that compared with carbon fiber, aramid fiber, ultra-high molecular weight polyethylene fiber and other fibers, continuous basalt fiber not only has the characteristics of high strength and high modulus, but also has good temperature resistance (-269 ~ 650 ℃), Anti-oxidation, anti-radiation, heat and sound insulation, good filterability, high compressive strength and shear strength, suitable for use in various environments and other excellent properties. The operating temperature range of continuous basalt fiber is -269~650°C (softening point is 960°C), while that of glass fiber is -60~450°C. When the continuous basalt fiber works at 400°C, its post-break strength can maintain 85%; when it works at 600°C, its post-break strength can still maintain 80% of its original strength; It can maintain 50% to 60% of its strength, and the glass wool is completely destroyed. The oxidation resistance of carbon fiber is poor, and CO and CO ₂ are produced at 300°C, and the maximum use temperature of meta-aramid fiber is only 250°C. The acid and alkali resistance and corrosion resistance of the fabric produced by basalt are also better than the currently commonly used glass fiber base cloth.

Based on the above research, the applicant proposes a basalt fiber film-coated filter material with high temperature resistance and corrosion resistance, which is formed by laminating basalt fiber bulked yarn base cloth and PTFE membrane. the

The above-mentioned basalt fiber bulked yarn base cloth is made of basalt fiber through loom weaving, and is commercially available. The base fabric is a twill weave two-dimensional double-structure woven fabric, and the weft direction is bulked yarn, that is, the weft yarn has been expanded. The weft-expanded basalt base fabric can increase the efficiency of the fabric to capture dust. the

The above-mentioned PTFE membrane is an expanded microvoid polytetrafluoroethylene membrane produced by Sinoma Science and Technology Co., Ltd., with the brand name ePTFE-N. This PTFE membrane has a multi-layer microporous wire drawing structure, its maximum pore size is ≤1.5μm, and its air permeability is ≥4cm/s. the

In order to further improve the mechanical properties of the utility model, a layer of fluorine-containing substance is also arranged between the above-mentioned basalt fiber bulked yarn base cloth and the PTFE membrane. the

The above-mentioned basalt fiber base cloth and PTFE membrane can be laminated as a whole by conventional high-temperature hot-pressing process. the

The invention has soft hand feeling, is easy to sew, and has excellent mechanical properties. The radial strength of the treated cloth can reach 3700N/25mm, the weft strength of the treated cloth can reach 3500N/25mm, and the air permeability of the treated cloth can reach as high as 40cm/s. Moreover, the present invention can be used for a long time at a high temperature of 300 degrees, and the filtration efficiency of dust below 1 μm can reach 99.995%, and can be widely used in high temperature and harsh flue gas environments that cannot be achieved by ordinary filter materials. the

Description of drawings

Figure 1 is a schematic structural view of the utility model. the

Detailed ways

The manufacturing method of the present invention will be specifically described below in conjunction with examples. the

As shown in Figure 1, the utility model comprises basalt fiber bulked yarn base cloth 1 and fluorine-containing substance 2, PTFE membrane, 3 three layers. Among them, the warp and weft density of the basalt fiber bulked yarn base fabric 1 is 18*16, and the weft yarn is processed by bulking and blowing, and the base fabric has a twill-weave double-dimensional structure. the

The fluorine-containing substance 2 located between the basalt fiber bulked yarn base cloth 1 and the PTFE membrane 3 is coated on the surface of the basalt fiber bulked yarn base cloth 1 by using polytetrafluoroethylene emulsion through a conventional dipping process. the

The basalt fiber bulked yarn base cloth 1 coated with the fluorine-containing layer 2 on the surface and the PTFE film 3 are laminated by conventional high-temperature hot-pressing process, the lamination temperature is 300°C~380°C, and the lamination pressure is 0.1MPa-1MPa. the

Claims (2)

1. basalt fibre coated filter material is characterized in that being laminated with by basalt fibre buiky yarn base cloth and PTFE film and forms.

2. like right 1 said basalt fibre coated filter material, it is characterized in that also being provided with the fluorine-containing material layer between basalt fibre buiky yarn base cloth and the PTFE film.

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