Quantitative filter paper and preparing method and application thereof

A quantitative filter paper, mass ratio technology, applied in filter paper, paper, papermaking and other directions, can solve the problems of filtration speed, filtration accuracy and stability need to be further unified, high production cost of quantitative filter paper, to achieve high stability, low cost, high performance stable effect

Inactive Publication Date: 2015-09-02
杭州特种纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production cost of quantitative filter paper is relatively high, and the filtration speed, filtration accuracy and stability need to be further unified

Method used

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  • Quantitative filter paper and preparing method and application thereof
  • Quantitative filter paper and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Put 20kg of cotton pulp with a beating degree of 16°SR on the sheet-making net to form, press, and dry to obtain the inflow layer;

[0023] 2. Put the inflow layer prepared in step 1 on the lamination net, cover the inflow layer with 20kg of cotton pulp with a beating degree of 20°SR, and then form, press, and dry to obtain the composite layer of the inflow layer-intermediate layer ;

[0024] 3. Put the composite layer of the inflow layer-intermediate layer prepared in step 2 on the lamination net, cover the interlayer with 10kg of cotton pulp with a beating degree of 24°SR, and then form, press, and dry to obtain the inflow layer - Composite layer of middle layer - outflow layer;

[0025] 4. The composite layer of the inflow layer-middle layer-outflow layer prepared in step 3 is impregnated with a mixed acid of hydrochloric acid and hydrofluoric acid with a concentration of 5wt% for 7 hours, then neutralized with alkali, and then washed with deionized water Multip...

Embodiment 2

[0028] 1. Put 30kg of kraft wood pulp with a beating degree of 17°SR on a sheet net for forming, pressing, and drying to obtain the inflow layer;

[0029] 2. Put the inflow layer prepared in step 1 on the sheet net, cover the inflow layer with 20 kg of kraft wood pulp with a beating degree of 21 ° SR, and then form, press, and dry to obtain the inflow layer-middle layer Composite layer;

[0030] 3, the composite layer of the inflow layer-middle layer prepared in step 2 is placed on the sheet net, and the kraft wood pulp of 25 ° SR is covered on the middle layer by 10kg beating degree, and then forming, pressing, drying, to obtain Composite layer of inflow layer-middle layer-outflow layer;

[0031] 4. The composite layer of the inflow layer-middle layer-outflow layer prepared in step 3 is impregnated with a mixed acid of hydrochloric acid and hydrofluoric acid with a concentration of 5.5wt% for 8 hours, then neutralized with alkali, and then deionized water Wash multiple time...

Embodiment 3

[0034] 1. Put 40kg of cotton pulp with a beating degree of 14°SR on the sheet-making net to form, press, and dry to obtain the inflow layer;

[0035] 2. Place the inflow layer prepared in step 1 on the lamination net, cover the inflow layer with 20kg of cotton pulp with a beating degree of 19°SR, and then form, press, and dry to obtain a composite layer of the inflow layer-intermediate layer ;

[0036] 3. Put the composite layer of the inflow layer-intermediate layer prepared in step 2 on the lamination net, cover the interlayer with 10kg of cotton pulp with a beating degree of 23°SR, and then form, press, and dry to obtain the inflow layer - Composite layer of middle layer - outflow layer;

[0037] 4. The composite layer of the inflow layer-middle layer-outflow layer prepared in step 3 is impregnated with a mixed acid of hydrochloric acid and hydrofluoric acid with a concentration of 4.5wt% for 6 hours, then neutralized with alkali, and then deionized water Wash multiple ti...

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Abstract

The invention discloses quantitative filter paper, comprising an inflow layer, a middle layer and an outflow layer. The inflow layer is made by forming, pressing and drying slurry 14 DEG SR to 17 DEG SR in beating degree; the middle layer is made by forming, pressing and drying pulp 19 DEG SR to 21 DEG SR in beating degree; the outflow layer is made by forming, pressing and drying pulp 23 DEG SR to 25 DEG SR; the inflow layer, the middle layer and the outflow layer are made of the pulp of same material. The invention further discloses a preparing method of and application of the quantitative filter paper. The layers have different beating degrees of the pulp, the different void distributions of the insides are ensured, and high filtering speed, high precision and high stability are integrated; the preparing method ensures that the fibers in the layers are tightly tangled together, no evident interface occurs, the three-layer composite filter payer manufactured with the pulp is in a complete structure, and smoothness of the separating process is ensured.

Description

technical field [0001] The invention relates to the technical field of filter paper, in particular to a quantitative filter paper and its preparation method and application. Background technique [0002] Quantitative filter paper belongs to cellulose filter paper, which is a kind of paper with good filtration performance. The paper is loose and has strong absorption performance for liquids. Therefore, it is often used as a filter medium in chemical analysis experiments to separate solids and liquids. In the manufacturing process, the pulp is treated with hydrochloric acid and hydrofluoric acid, and washed with deionized water to remove most of the paper fibers, so there is little residual ash after burning, which has almost no effect on the analysis results, and is suitable for precision quantitative analysis. At present, the production cost of quantitative filter paper is relatively high, and the filtration speed, filtration accuracy and stability need to be further unifie...

Claims

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Application Information

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IPC IPC(8): D21F13/00D21H23/32D21H17/65D21H11/06D21H11/12
CPCD21F13/00D21H11/04D21H11/12D21H17/65D21H23/32D21H27/08
Inventor 吴安波
Owner 杭州特种纸业有限公司
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