Oily defoamer

Abstract

The invention relates to an oily defoamer capable of being used as a black liquor defoamer. The oily defoamer is prepared from the following compositions: kerosene, paraffin, octyl and sulfonated castor oil of which the weight ratio is 100-240:70-150:50-130:80-120. The oily defoamer has weak foam inhibiting capacity but strong defoaming capacity, can be combined with other defoamers for use to reduce cost, and has wide application.

Description

technical field [0001] The invention relates to a defoamer, in particular to an oily defoamer which can be used as a black liquor defoamer. Background technique [0002] The amount of defoamer used in the paper industry is not large, but its role cannot be ignored. In the whole pulp and paper industry process, a series of operations after cooking and discharging, such as washing, screening, bleaching, thickening, pulp supply system, surface sizing, coating, black liquor recovery, etc., are affected to varying degrees by foam It will interfere with normal production, reduce the quality of paper, and even make production impossible in serious cases. Foam elimination methods mainly include chemical, physical and mechanical methods. The chemical defoaming method is to add chemical substances (defoamers) to eliminate foam during the production process; the physical defoaming method uses standing, heating or decompression to eliminate foam; the mechanical defoaming method uses m...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems existing in the above-mentioned prior art, and through optimized formula design and careful manufacture, an oily defoamer is provided, which solves the problem of unsatisfactory defoaming effect of the defoamer in the prior art, and is easy to combine with other Defoamer is used in conjunction with flexible use