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Antifoam agent for wet part of papermaking

A defoamer and wet end technology, which is applied in the field of preparation of defoamer for papermaking wet end, and can solve problems such as harmful foam

Inactive Publication Date: 2008-02-27
JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of this invention is to provide a kind of defoamer for papermaking wet end, to solve the harmful foam problem existing in papermaking production

Method used

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  • Antifoam agent for wet part of papermaking
  • Antifoam agent for wet part of papermaking
  • Antifoam agent for wet part of papermaking

Examples

Experimental program
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Effect test

example 1

[0057] Preparation of fatty alcohol polyether A1:

[0058] Add 65g of n-octanol and 100ppm of bimetallic catalyst into the polyether reactor, and then vacuumize at 100°C to remove low molecular substances and trace moisture in the raw materials. Keep it down for 30min. Then, remove the vacuum, continue to heat up to around 150°C, add 1000g of mixed alkanes of ethylene oxide (EO) and propylene oxide (PO), wherein the quality of EO is 400g, and the quality of PO is 600g. After adding the mixed alkanes, keep it at the reaction temperature for 60 minutes, and finally cool down and discharge the material to obtain a colorless transparent viscous liquid octanol polyether A1. The cloud point of its 1% aqueous solution is 22 ° C. The average molecular weight of octanol polyether A1 is for 2140.

example 2

[0060] The preparation of fatty alcohol polyether A2:

[0061] Add 60g glycerin and 0.3% KOH catalyst into the polyether reactor, and then vacuumize at around 80°C to remove low molecular substances and trace moisture in the raw materials. Maintain for 45min. Then, remove the vacuum, continue to heat up to around 130°C, add 250gPO to it, keep warm for 30min after adding, add 750gEO, after adding EO, continue to keep warm and stir for 60min, finally neutralize with acetic acid, and adsorb with acid clay After refining, the obtained colorless viscous liquid is glycerol polyether Λ2, the cloud point of its 1% aqueous solution is 35°C, and the average molecular weight of glycerol polyether A2 is 2800.

example 3

[0063] The preparation of fatty alcohol polyether A3:

[0064] Add 140g of stearyl alcohol and 0.3% KOH catalyst into the polyether reactor, and then vacuumize at around 80°C to remove low-molecular substances and traces of water in the raw materials. Keep it down for 45 minutes. Then, remove the vacuum, continue to heat up to around 130°C, add 1400g of mixed alkanes of EO and PO to it, wherein the mass of EO is 450g, and the mass of PO is 950g. and adsorption purification to obtain a colorless viscous liquid stearyl ether A3, the cloud point of its 1% aqueous solution is 19°C, and the average molecular weight of stearyl ether A3 is 3084.

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Abstract

The present invention relates to a defoaming agent for paper-making pulp. Its composition includes the following components: (1), 0.1-20% of fatty alcohol; (2), 10-80% of fatty alcohol polyether; (3), 5-70% of general group modified polyether, said general group modified polyether is obtained by using polyether and end-capping material methane chloride, butane chloride or fatty acid and making them undergo the process of end-capping modification reaction; (4), 0.1-30% of polyether modified organic silicone (called 'silicopolyether' for short), said silicopolyether is obtained by using hydrogen-containing silicone oil and unsaturated polyether through addition reaction; and (5), 0.1-20% natural oil and fat.

Description

technical field [0001] The invention relates to the preparation of a defoamer for the wet end of papermaking. The defoamer is a fine chemical additive. Therefore, the preparation of the defoamer for the wet end of papermaking belongs to the field of special chemicals for papermaking. Background technique [0002] Papermaking is a key industry in the production of the national economy. In the paper industry, a variety of surfactants are often used, such as sizing agents, retention aids, filter aids, strengthening agents, deinking agents, dyes, etc. Active agents, they are also easy to foam during the operation of the paper machine. With the development of large industries, the speed of the paper machine is getting faster and faster. At present, the speed of the high-speed paper machine in production has reached 1800m / min. Paper whitening water is generally used in a closed cycle. During this process, if the air bubbles are not driven away in time, "pit" will be formed on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/14
Inventor 吴飞曹治平孙颖欣钟翔
Owner JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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