PBT (polybutylene terephthalate) composite filtering material for fuel filter and preparation method

A fuel filter and filter material technology, applied in chemical instruments and methods, separation methods, filter paper, etc., can solve the problems of large gaps in the filter material, affecting the service life, reducing the dirt holding capacity, etc., to improve the filtration efficiency and accuracy. , Excellent flexibility and temperature resistance, the effect of avoiding bending damage

Inactive Publication Date: 2014-04-30
DONGHUA UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the three major indicators for judging the quality of filter materials are: oil-water separation degree, filtration accuracy and dirt-holding capacity, but the current filter materials cannot reach a high level in these three points at the same time
The patent application number is CN201010526810.2, which provides a fuel-saving filter paper for fuel filters, but its disadvantage is that it is difficult to remove the water in the fuel, and the use of a single-layer filter paper will greatly reduce the dirt-holding capacity, thereby affect the service life; the patent application number is CN201010111116.4, which provides a highly water-absorbent fuel liquid filter material and its manufacturing method. 20 to 35 microns will result in large gaps in the filter material, making it difficult to meet precise filtration requirements; the patent application number is CN201020033408.6, which provides a PBT melt-blown cloth composite filter material. The defect of each layer of coating In this way, it is difficult to achieve a good balance between the two of ensuring the bonding between the layers and reducing the pore clogging
Since it is difficult to achieve an optimal balance between the oil-water separation rate, filtration efficiency and dirt-holding capacity of the existing fuel filter, that is, to improve the oil-water separation rate and filtration efficiency (or filtration accuracy), it is difficult to improve the filter performance. Dirt holding capacity and vice versa

Method used

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  • PBT (polybutylene terephthalate) composite filtering material for fuel filter and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1. Preparation of base paper layer:

[0059] The specific steps of preparing the base paper layer are mixing, wet slurry, paper forming, drying and coiling. Wherein, the base paper layer contains three kinds of ultrafine chopped fibers with a length of 2 mm, namely: PBT fiber, viscose fiber and PVA fiber; wherein, PBT fiber accounts for 5% of the total weight, and its fineness is 0.5 dtex; viscose fiber accounts for 50% of the total weight, and its fineness is 0.3dtex; PVA fiber accounts for 40% of the total weight, and its fineness is 0.8dtex.

[0060] 2. Preparation of the middle layer:

[0061] The specific steps of preparing the intermediate layer include PBT slicing, drying, screw melting, metering pump, hot air, fine flow stretching to form a web, cooling and forming, and coiling. Wherein, the middle layer is PBT melt-blown fine cloth, and its grammage is 20g / m 2 , with a fiber diameter of 0.1 μm. The specific process parameters are: slice drying: pre-crystall...

Embodiment 2

[0067] 1. Preparation of base paper layer:

[0068] The specific steps of preparing the base paper layer are mixing, wet slurry, paper forming, drying and coiling. Wherein, the base paper layer contains three kinds of ultrafine chopped fibers with a length of 6 mm, namely: PBT fiber, viscose fiber and PVA fiber; wherein, PBT fiber accounts for 15% of the total weight, and its denier is 0.8 dtex; viscose fiber accounts for 40% of the total weight, and its fineness is 0.8dtex; PVA fiber accounts for 50% of the total weight, and its fineness is 2.2dtex.

[0069] 2. Preparation of the middle layer:

[0070] The specific steps of preparing the intermediate layer include PBT slicing, drying, screw melting, metering pump, hot air, fine flow stretching to form a web, cooling and forming, and coiling. Wherein, the middle layer is PBT melt-blown fine cloth, and its grammage is 50g / m 2 , with a fiber diameter of 15 μm. The specific process parameters are: slice drying: pre-crystalliz...

Embodiment 3

[0076] 1. Preparation of base paper layer:

[0077] The specific steps of preparing the base paper layer are mixing, wet slurry, paper forming, drying and coiling. Wherein, the base paper layer contains three kinds of ultrafine chopped fibers with a length of 4 mm, namely: PBT fiber, viscose fiber and PVA fiber; wherein, PBT fiber accounts for 5% of the total weight, and its denier is 0.7 dtex; viscose fiber accounts for 45% of the total weight, and its fineness is 0.6dtex; PVA fiber accounts for 50% of the total weight, and its fineness is 1.8dtex.

[0078] 2. Preparation of the middle layer:

[0079] The specific steps of preparing the intermediate layer include PBT slicing, drying, screw melting, metering pump, hot air, fine flow stretching to form a web, cooling and forming, and coiling. Wherein, the middle layer is PBT melt-blown fine cloth, and its grammage is 40g / m 2 , with a fiber diameter of 10 μm. The specific process parameters are: slice drying: pre-crystalliza...

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Abstract

The invention relates to a composite filtering material for a fuel filter and a preparation method. The composite filtering material for the fuel filter contains three layers, i.e. a base paper layer, an interlayer and a protective surface layer, wherein the base paper layer contains superfine PBT (polybutylene terephthalate), PVA (polyvinyl alcohol) and viscose chopped fibers with lengths of 2 to 6 millimeters; the interlayer is PBT melt-blown fine cloth; the protective surface layer is PET/PBT (polyethylene terephthalate/polybutylene terephthalate) blended viscose cloth. The preparation method for the composite filtering material comprises the following steps of feeding the three substrate layers into point type patterned rollers through three pairs of tension regulation rollers respectively, and performing hot compression molding. According to the composite filtering material and the preparation method, the base paper layer has a function of completely adsorbing water in a fuel; the three layers contain the superfine PBT fibers, so that the filtering material is soft and resistant to folding, the blocking rate can be maximally reduced, and the filtering efficiency and accuracy are improved; in addition, the superfine PBT fibers are used as a connecting material, so that the operating temperature of the fuel filter can be born, and bending damage to filtering paper during high-speed folding can also be avoided.

Description

technical field [0001] The invention belongs to the technical field of composite filter materials, and relates to a PBT composite filter material for a fuel filter and a preparation method thereof. Background technique [0002] In recent years, my country's PM2.5 concentration index has remained high. According to statistical analysis, one-third of PM2.5 in cities comes from vehicle exhaust emissions, and 50% of PM2.5 in big cities is caused by vehicle exhaust and its dust. The reason why automobile exhaust can cause such a large pollution is mainly that the quality of domestic oil products in our country is not up to standard, and there are many impurities in the oil. The fuel filter can filter out harmful particles and water in the fuel gas system of the engine to protect the oil pump nozzle, cylinder liner, piston ring, etc., reduce wear, rust and avoid clogging. It can remove solid impurities such as iron oxide and dust contained in the fuel, prevent the fuel system fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14B32B27/02B32B27/06B32B27/36B32B37/10F02M37/22D21H27/08D21F11/00B29C47/92B29C48/92
Inventor 王依民倪建华夏于旻王燕萍
Owner DONGHUA UNIV
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