Method for preparing high-strength cured filter paper

A high-strength, filter paper technology, applied in the field of filter paper, can solve the problems of loose filter paper, low strength, easy deformation, etc., and achieve the effects of improved burst resistance, high air permeability, and good stiffness.

Active Publication Date: 2013-03-06
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] The filter paper made of natural plant fiber raw materials cannot satisfy the production and processing of filter elements and the requirements of the filter paper itself in use due to its small tightne

Method used

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  • Method for preparing high-strength cured filter paper

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Take 30kg of coniferous wood pulp, 55kg of mercerized wood pulp, and 15kg of bleached hardwood pulp, put them into a pulper for pulping according to conventional conditions, and then grind them on-line with a double-disc refiner to obtain mixed pulp pulp;

[0019] (2) Forming the above-mentioned mixed pulp slurry into paper to obtain base paper and drying;

[0020] (3) Preparation of curing agent: select phenolic resin and formaldehyde as the curing agent, and the curing agent is prepared according to the ratio of 1.3% of the pulp slurry;

[0021] (4) Coat the synthesized curing agent on the surface of the base paper, and heat the curing agent raw material to pre-cure gradually; the coating amount of the curing agent is 45g / m 2 ;

[0022] (5) Drying of cured filter paper: Dry the base paper coated with curing agent through a drying tunnel or an oven at a drying temperature of 120°C and a drying time of 15s.

[0023] The performance of the high-strength solidified ...

Embodiment 2

[0025] (1) Take 35kg of coniferous wood pulp, 45kg of mercerized wood pulp, and 20kg of bleached hardwood pulp, put them into a pulper for pulping according to conventional conditions, and then grind them on-line with a double-disc refiner to obtain mixed pulp pulp;

[0026] (2) Forming the above-mentioned mixed pulp slurry into paper to obtain base paper and drying;

[0027] (3) Preparation of additives: prepared at a ratio of 1.5% of the slurry;

[0028] (4) Coat the synthesized curing agent on the surface of the base paper, and heat to pre-cure the raw material of the curing agent gradually; the coating amount of the curing agent is 55g / m 2 ;

[0029] (5) Drying of cured filter paper: Dry the base paper coated with curing agent through a drying tunnel or an oven at a drying temperature of 125°C and a drying time of 20s.

[0030] The performance of the high-strength solidified filter paper was tested, and the test results are shown in Table 1.

Embodiment 3

[0032] (1) Take 30kg of coniferous wood pulp, 50kg of mercerized wood pulp, and 20kg of bleached hardwood pulp, put them into a pulper for pulping according to conventional conditions, and then grind them online with a double-disk refiner to obtain mixed pulp pulp;

[0033] (2) Forming the above-mentioned mixed pulp slurry into paper to obtain base paper and drying;

[0034] (3) Preparation of additives: prepared at a ratio of 1% of the slurry;

[0035] (4) Coat the synthesized curing agent on the surface of the base paper, and heat it to pre-cure the curing agent raw material gradually; the coating amount of the curing agent is 40g / m 2 ;

[0036] (5) Drying of cured filter paper: Dry the base paper coated with curing agent through a drying tunnel or an oven at a drying temperature of 135°C and a drying time of 30s.

[0037] The performance of the high-strength solidified filter paper was tested, and the test results are shown in Table 1.

[0038] The performance tests of t...

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Abstract

The invention relates to a method for preparing high-strength cured filter paper. The method comprises the following steps: (1) taking the following components in percentage by weight: 30-35% of softwood pulp, 45-55% of mercerization wood pulp and 15-20% of bleached hardwood pulp; and repulping and grinding to obtain mixed paper pulp size; (2) papermaking and molding to obtain body paper, and drying the body paper; (3) curing agent preparation: selecting phenolic resin and formaldehyde as a curing agent; and preparing the curing agent according to the proportion of 1-1.5% of paper pulp size; (4) coating the synthesized curing agent on the surface of the body paper; heating to precure the raw materials of the curing agent step by step, wherein the coating amount of the curing agent is 40-55g/m<2>; and (5) cured filter paper drying: drying the body paper coated with the curing agent through a drying tunnel or a drying oven, wherein the drying temperature is 120-135 DEG C, and the drying time is 15-30 seconds. The high-strength cured filter paper prepared by the method provided by the invention has higher air permeability, and simultaneously has better stiffness and waterproof effect; the bursting strength of the high-strength cured filter paper after being cured is improved; and the service life is prolonged.

Description

technical field [0001] The invention relates to a filter paper, in particular to a preparation method of a high-strength solidified filter paper. Background technique [0002] The filter paper made of natural plant fiber raw materials cannot satisfy the production and processing of filter elements and the requirements of the filter paper itself in use due to its small tightness, loose filter paper, low strength, soft texture, and easy deformation. Therefore, in the preparation of filter paper, a resin that can improve the physical strength without affecting the air permeability must be used for coating processing. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a high-strength solidified filter paper with good air permeability, good stiffness and water resistance effect in view of the above-mentioned deficiencies in the prior art. [0004] For solving the problems of the technologies described above, the technic...

Claims

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Application Information

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IPC IPC(8): D21H27/08D21H19/24D21H19/16
Inventor 吴安波
Owner 杭州特种纸业有限公司
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