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Medium-speed qualitative filter paper and preparation method thereof

A qualitative filter paper, medium-speed technology, applied in the field of filter paper, can solve the problems of high residual ash, poor water resistance of qualitative filter paper, and reduced filtration accuracy

Inactive Publication Date: 2016-09-28
杭州特种纸业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Qualitative filter paper, that is, qualitative analysis filter paper, generally has a lot of residual ash, which is only used for general qualitative analysis and for filtering sediment or suspension in solution, and cannot be used for quality analysis
However, the existing qualitative filter paper uses a single wood pulp as a raw material. For this single fiber material, in order to improve the filtration accuracy, the pore size must be reduced, which will increase the filtration resistance and shorten the practical life; in order to reduce the filtration resistance and prolong the service life , it is necessary to increase the pore size, but it will reduce the filtration accuracy, so it is difficult to balance the performance parameters such as filtration accuracy and filtration resistance through the adjustment of microscopic pores; in addition, this kind of qualitative filter paper has poor water resistance, and it is easy to cause paper to break after a short period of filtration. leak

Method used

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  • Medium-speed qualitative filter paper and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A medium-speed qualitative filter paper, with a three-layer structure from the inflow surface to the outflow surface of the filter paper, the middle layer of the three-layer structure includes 20 parts of softwood pulp, 30 parts of alkali-treated cotton Short fluff pulp, 1 part of dispersant, 1 part of wet strength agent; the described flow-in surface layer includes 10 parts of acetate fiber, 30 parts of flax fiber, 0.2 part of water repellent, 0.5 part of wet strength agent ; The described outflow surface layer includes 10 parts of polypropylene fibers, 30 parts of bamboo fibers, and 0.2 parts of water repellent in parts by weight; the described dispersant is carboxymethyl cellulose; the described wet strength agent is Polyamide polyepichlorohydrin resin; the waterproofing agent is selected from melamine resin, and the α-cellulose content in the medium-speed qualitative filter paper is 95%.

[0025] The preparation method of above-mentioned middle speed qualitative fil...

Embodiment 2

[0033] A medium-speed qualitative filter paper, with a three-layer structure from the inflow surface to the outflow surface of the filter paper, the middle layer of the three-layer structure includes 40 parts of softwood pulp, 80 parts of alkali-treated Cotton linter pulp, 3 parts of dispersant, 2 parts of wet strength agent; the described flow-in surface layer includes 30 parts of acetate fiber, 60 parts of flax fiber, 2 parts of water repellent, 2 parts of wet strength agent in parts by weight agent; the outflow surface layer includes 30 parts by weight of polypropylene fiber, 80 parts of bamboo fiber, and 2 parts of water repellent; the described dispersant is sodium pyrophosphate; the described wet strength agent is poly An amide polyepichlorohydrin resin; the waterproofing agent is waterproof slurry, and the α-cellulose content in the medium-speed qualitative filter paper is 98%.

[0034] The preparation method of above-mentioned middle speed qualitative filter paper, com...

Embodiment 3

[0042]A medium-speed qualitative filter paper, with a three-layer structure from the inflow surface to the outflow surface of the filter paper, the middle layer of the three-layer structure includes 30 parts of softwood pulp, 60 parts of alkali-treated cotton Short fluff pulp, 2 parts of dispersant, 1 part of wet strength agent; the described flow-in surface layer includes 20 parts of acetate fiber, 50 parts of flax fiber, 1 part of water repellent, 1 part of wet strength agent in parts by weight ; The outflow surface layer includes 20 parts of polypropylene fiber, 60 parts of bamboo fiber, and 1 part of water repellent in parts by weight; the described dispersant is sodium hexametaphosphate; Amide polyepichlorohydrin resin; the waterproofing agent is urea-formaldehyde resin, and the α-cellulose content in the medium-speed qualitative filter paper is 97%.

[0043] The preparation method of above-mentioned middle speed qualitative filter paper, comprises the steps:

[0044] 1)...

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Abstract

The invention provides medium-speed qualitative filter paper. The medium-speed qualitative filter paper is of a three-layer structure from an inflow face to an outflow face of the filter paper, wherein a middle layer of the three-layer structure contains the ingredients in parts by weight: 20-40 parts of softwood pulp and 30-80 parts of alkali-treated cotton linter pulp; the inflow face contains the ingredients in parts by weight: 10-30 parts of acetate fibers and 30-60 parts of flax fibers; the outflow face contains the ingredients in parts by weight: 10-30 parts of polypropylene fibers and 40-80 parts of bamboo fibers. The medium-speed qualitative filter paper has the characteristics of good filtering and absorbing performance, long service life, good wet strength and high compressive strength.

Description

technical field [0001] The invention relates to the technical field of filter paper, in particular to a medium-speed qualitative filter paper and a preparation method thereof. Background technique [0002] Qualitative filter paper, that is, qualitative analysis filter paper, generally has a lot of residual ash, which is only used for general qualitative analysis and for filtering sediment or suspension in solution, and cannot be used for quality analysis. However, the existing qualitative filter paper uses a single wood pulp as a raw material. For this single fiber material, in order to improve the filtration accuracy, the pore size must be reduced, which will increase the filtration resistance and shorten the practical life; in order to reduce the filtration resistance and prolong the service life , it is necessary to increase the pore size, but it will reduce the filtration accuracy, so it is difficult to balance the performance parameters such as filtration accuracy and f...

Claims

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Application Information

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IPC IPC(8): D21H27/08D21H11/12D21H13/14D21H13/20D21F11/14D21D1/30
CPCD21H27/08D21D1/303D21F11/14D21H11/12D21H13/14D21H13/20
Inventor 吴安波
Owner 杭州特种纸业有限公司
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