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A kind of flat filter paper and preparation method thereof

A technology of filter paper and flat layer, which is applied in the field of flat layer filter paper and its preparation, can solve the problems of affecting the air permeability and filtration efficiency of air filter paper, not being suitable for magnetite filtration, and the large amount of resin layer coating, etc., so as to improve the strength, Enhanced dry and wet strength and pressure resistance, low filtration resistance

Active Publication Date: 2018-06-12
杭州特种纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also defects: since there are resin layers on both sides of the air filter paper, and the coating amount of the resin layer is relatively large, resulting in a thicker thickness, which seriously affects the air permeability and filtration efficiency of the air filter paper.
[0006] Moreover, the above is only applicable to air filtration, not to magnetite filtration

Method used

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  • A kind of flat filter paper and preparation method thereof
  • A kind of flat filter paper and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a flat filter paper includes an upper filter layer 1, a lower filter layer 2 and a composite coating 3 coated on the upper surface of the upper filter layer and the lower surface of the lower filter layer.

[0034] Wherein, the thickness of the upper filter layer is 0.05-0.07mm, and the thickness of the lower filter layer is 0.08-0.1mm.

[0035] A kind of preparation method of flat layer filter paper, carries out according to the following steps:

[0036] a. Preparation of base paper for the upper filter layer: 30 parts of mercerized fiber, 15 parts of sisal fiber, and 15 parts of horn gourd fiber are mixed and beaten, the concentration of the slurry is 4wt%, and the degree of beating until the slurry is 13 ° SR Finally, refining is carried out until the degree of beating is 19 ° SR, and slurry a is obtained; 1 part of ethylene glycol diglycidyl ether is added to the slurry a, and the slurry b is obtained after stirring evenly; Add 0.3 parts...

Embodiment 2

[0043] A flat layer filter paper comprises an upper filter layer, a lower filter layer and a composite coating arranged on the upper surface of the upper filter layer and the lower surface of the lower filter layer.

[0044] Wherein, the thickness of the upper filter layer is 0.05-0.07mm, and the thickness of the lower filter layer is 0.08-0.1mm. A kind of preparation method of flat layer filter paper, carries out according to the following steps:

[0045] a. Preparation of the base paper for the upper filter layer: 20 parts of mercerized fiber, 10 parts of sisal fiber, and 10 parts of horn gourd fiber are mixed and beaten, the concentration of the slurry is 3.5wt%, and the degree of beating until the slurry is 12° After SR, refine the slurry until the degree of beating is 18.5°SR to obtain slurry a; add 0.5 parts of ethylene glycol diglycidyl ether to the slurry a, and stir evenly to obtain slurry b; Add 0.2 parts of sodium hexametaphosphate and 1 part of PPE to the slurry b...

Embodiment 3

[0052] A flat layer filter paper comprises an upper filter layer, a lower filter layer and a composite coating arranged on the upper surface of the upper filter layer and the lower surface of the lower filter layer.

[0053] Wherein, the thickness of the upper filter layer is 0.05-0.07mm, and the thickness of the lower filter layer is 0.08-0.1mm.

[0054] A kind of preparation method of flat layer filter paper, carries out according to the following steps:

[0055] a. Preparation of the base paper for the upper filter layer: 40 parts of mercerized fiber, 20 parts of sisal fiber, and 20 parts of horn gourd fiber are mixed and beaten, the concentration of the slurry is 4.5wt%, and the degree of beating until the slurry is 14° After SR, refine the slurry until the degree of beating is 19.5°SR to obtain slurry a; add 1.5 parts of ethylene glycol diglycidyl ether to the slurry a, and stir evenly to obtain slurry b; Add 0.4 parts of sodium hexametaphosphate and 3 parts of PPE to th...

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Abstract

The invention relates to the technical field of filter paper, and discloses flat-layer filter paper and a method for preparing the same. The flat-layer filter paper comprises an upper filter layer, a lower filter layer and composite coatings. The composite coatings are respectively arranged on the upper surface of the upper filter layer and the lower surface of the lower filter layer; composite pulp comprises titanium dioxide aerogel particles, phenoxy resin, dimethylformamide and water; the upper filter layer is made of mercerized fibers, sisal fibers, calotropis gigantea fibers, wet strength agents, ethylene glycol diglycidyl ether, dispersing agents and water; the lower filter layer is made of broadleaf wood fibers, titanium dioxide aerogel particles, beta-cyclodextrin, carboxymethyl celluloses, ethylene glycol diglycidyl ether and water. The flat-layer filter paper and the method have the advantages that composite coatings which are good in gas permeability and water resistance are arranged on the filter layers of the flat-layer filter paper, and accordingly the water resistance, the weather resistance, the dry tensile strength and the wet tensile strength of the filter paper can be improved on the premise that the gas permeability and the filter efficiency of the paper are guaranteed.

Description

technical field [0001] The invention relates to the technical field of filter paper preparation, in particular to a flat filter paper and a preparation method thereof. Background technique [0002] As an effective filter medium, filter paper has been widely used in various fields such as the magnetite industry, and its market demand will continue to grow. The filter paper used in the magnetite mining industry adopts the flocculation process to extract magnets has high quality requirements. [0003] The production level of special paper in countries such as Europe, America and Japan has been in the leading position in the world. From the late 1960s to the 1970s, a series of high value-added specialty papers were developed. Nowadays, the filter paper technology in the United States and Japan is relatively perfect, but the filter paper is expensive, and the development of filter paper for magnetite filtration in my country started relatively late, and the technology still nee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/08D21H19/84D21F11/14D21H15/10D21H11/12D21H17/66D21H17/67D21H19/38D21H19/62D21H19/46
CPCD21F11/14D21H11/12D21H15/10D21H17/06D21H17/24D21H17/26D21H17/53D21H17/66D21H17/67D21H17/74D21H19/385D21H19/46D21H19/62D21H19/84D21H27/08
Inventor 吴安波
Owner 杭州特种纸业有限公司
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