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Defoamer for paper pulp and preparation method thereof

A technology of defoaming agent and pulp, applied in the direction of defoaming agent, etc., can solve problems such as defoaming difficulties, achieve good defoaming effect, promote uniform dispersion, promote compatibility and dispersibility

Active Publication Date: 2014-06-18
SUZHOU HENGKANG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the pulp manufacturing process, many additives are usually used, such as cooking agents, retention aids, wet strength agents, sizing agents, etc. Most of these substances are mainly polymer compounds, and the foam formed in water is due to the Adsorption increases the strength of the foam film, making it difficult to defoam
[0003] Because most of the pulp is mainly made of plant fibers, although natural plant cellulose contains more hydroxyl groups, it is insoluble in water, and a large number of tiny air bubbles will be adsorbed on the surface and inside of the fine fibers. Due to the special structure of plant fibers, the attached It is difficult to eliminate the bubbles with ordinary defoamers. In order to produce high-grade paper with uniform texture, there is an urgent need for a defoamer that can solve the problem of bubbles on the surface and inside of the fiber and has a good defoaming effect.

Method used

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  • Defoamer for paper pulp and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) 30kg of polyethyl ether with a relative molecular weight of 2000, 20kg of sodium alginate, 12kg of polyethylene oxide with a relative molecular weight of 2000, 7kg of stearyl alcohol, 6kg of triolein and 1kg of sodium hydroxide at 55°C, add Mix in the high-pressure homogenizer for 1 hour, the homogenizing pressure of the first section of the high-pressure homogenizer is 17MPa, and the homogenizing pressure of the second section is 3MPa,

[0025] (2) cooling the product of step (1) to room temperature, adjusting its pH to 6.5 with hydrochloric acid to obtain a defoamer for pulp,

[0026] The performance test results of the prepared defoamer are shown in Table 1.

Embodiment 2

[0028] (1) Put 20k of polyethyl ether with a relative molecular weight of 4000, 30kg of sodium alginate, 10kg of polyethylene oxide with a relative molecular weight of 1500, 5kg of stearyl alcohol, 4kg of triolein and 2kg of sodium hydroxide at 45°C, Add in the high-pressure homogenizer and mix for 2 hours. The homogeneous pressure of the first section of the high-pressure homogenizer is 20MPa, and the homogeneous pressure of the second section is 4.9Mpa.

[0029] (2) Cool the product of step (1) to room temperature, adjust its pH to 6.5 with hydrochloric acid, and obtain a defoamer for pulp.

[0030] The performance test results of the prepared defoamer are shown in Table 1.

Embodiment 3

[0032] (1) Put 50k of polyethyl ether with a relative molecular weight of 3000, 20kg of sodium alginate, 14kg of polyethylene oxide with a relative molecular weight of 3000, 10kg of stearyl alcohol, 8kg of triolein and 0.5kg of sodium hydroxide at 50°C , added to the high-pressure homogenizer and mixed for 2 hours, the homogenizing pressure of the first section of the high-pressure homogenizer is 18MPa, and the homogenizing pressure of the second section is 4MPa,

[0033] (2) Cool the product of step (1) to room temperature, adjust its pH to 6.5 with hydrochloric acid, and obtain a defoamer for pulp.

[0034] The performance test results of the prepared defoamer are shown in Table 1.

[0035] Table 1

[0036]

[0037] The defoamer that the present invention makes has good defoaming effect, as can be seen from Table 1, the defoaming effect under 35 ℃ is better than the defoaming effect under 25 ℃, and this is because the component of defoamer is in When the temperatur...

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Abstract

The invention discloses a defoamer for paper pulp and a preparation method thereof. The defoamer for paper pulp is prepared from the following components in parts by weight: 20-50 parts of polyethylether, 20-30 parts of sodium alga acid, 10-14 parts of polyoxyethylene, 5-10 parts of stearyl alcohol, 4-8 parts of glycerol trioleate, and 0.5-2 parts of sodium hydroxide. The defoamer for paper pulp disclosed by the invention is prepared from the components mixed in a high pressure homogenizer. The prepared defoamer has the characteristics of being free of toxicity, good in mobility and convenient to use, having an excellent defoaming effect and the like, and can be applied to a papermaking industry.

Description

technical field [0001] The invention belongs to the technical field of papermaking, in particular to a defoamer for pulp and a preparation method thereof. Background technique [0002] In the pulp manufacturing process, many additives are usually used, such as cooking agents, retention aids, wet strength agents, sizing agents, etc. Most of these substances are mainly polymer compounds, and the foam formed in water is due to the The adsorption increases the strength of the foam film, making it difficult to defoam. [0003] Because most of the pulp is mainly made of plant fibers, although natural plant cellulose contains more hydroxyl groups, it is insoluble in water, and a large number of tiny air bubbles will be adsorbed on the surface and inside of the fine fibers. Due to the special structure of plant fibers, the attached It is difficult to eliminate the bubbles with ordinary defoamers. In order to produce high-grade paper with uniform texture, there is an urgent need for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/12
Inventor 邓强
Owner SUZHOU HENGKANG NEW MATERIALS
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