Emulsion-type silicone resin defoamer for papermaking and pulping

A technology of silicone resin and defoamer, which is applied in the direction of defoamer, papermaking, textiles and papermaking, etc., can solve the problems of unsatisfactory defoaming effect and high cost, and achieve the effect of improving washing effect, high profit and reducing water consumption

Active Publication Date: 2015-07-29
JIANGSU SAIOUXINYUE DEFOAMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these inventions have high cost or unsatisfactory defoaming effect under strong alkali environment

Method used

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  • Emulsion-type silicone resin defoamer for papermaking and pulping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Mix 20 parts of hexaphenyldisiloxane, 20 parts of tetramethoxysilane, 5 parts of water, 20 parts of ethanol, and 1 part of hydrochloric acid in 60 o C to react for 6 hours, then add 2 parts of NaOH to react until alkaline, remove water under reduced pressure; then add 30 parts of hydroxyl silicone oil (20cst), 50 parts of epoxy-containing siloxane, 10 parts of decanediamine, o C continued to react for 6 hours to obtain special-effect silicone resin A with a cross-linked network structure.

Embodiment 2

[0021] Example 2: 60 parts of hexaphenyldisiloxane, 5 parts of tetramethoxysilane, 20 parts of water, 5 parts of ethanol, and 5 parts of hydrochloric acid were mixed at 80 o C to react for 2 hours, then add 10 parts of NaOH to react to alkalinity, remove water under reduced pressure; then add 100 parts of hydroxyl silicone oil (1000cst), 30 parts of epoxy-containing siloxane, 1 part of hexamethylenediamine, at 200 o C continued to react for 0.5 hours to obtain special-effect silicone resin B with a cross-linked network structure.

Embodiment 3

[0022] Example 3: 20 parts of hexamethyldisiloxane, 20 parts of tetramethoxysilane, 5 parts of water, 20 parts of ethanol, and 1 part of hydrochloric acid were mixed at 60 o C to react for 6 hours, then add 2 parts of KOH to react until alkaline, remove water under reduced pressure; then add 30 parts of hydroxyl silicone oil (20cst), 50 parts of epoxy-containing siloxane, 10 parts of decanediamine, at 120 o C continued to react for 6 hours to obtain a special-effect silicone resin C with a cross-linked network structure.

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Abstract

The invention provides an emulsion type silicon resin defoaming agent for pulping in papermaking. The defoaming agent comprises 30-50% of nonvolatile matters and the balance being deionized water according to weight percentage; the nonvolatile matters comprises the following compositions in parts by weight as follows: 5-15 parts of special-effect silicon resin, 25-85.2 parts of polymethylsiloxane, 2-24 parts of hydrophobic white carbon black, 2.8-12 parts of an emulsifier, 5-24 parts of a dispersing agent; at 25 DEG C, the PH value is 6.0-8.0, the density is 0.98-1.05g / ml, the particle size of the emulsion ranges from 1mum to 25mum, most of the particle size of the emulsion is greater than 90%. The defoaming agent can fast eliminate foams generated by lignin and other surfactants, accelerate the dehydration process and improve a paper pulp washing effect, the water consumption is reduced, and the later pollution is avoided, and the quality of paper pulp is improved, and the relatively environment-friendly paper pulp production with relatively high profits can be realized.

Description

technical field [0001] The invention relates to a defoamer, in particular to an emulsion-type silicone resin defoamer for papermaking and pulping. Background technique [0002] Liquid foam is a common and serious problem in industrial production. During the paper pulping process, the slurry will generate a lot of surface active substances in situ, and at the same time, the high mechanical force will cause a large amount of air to be mixed in, so air bubbles are easily generated. When the foaming phenomenon is serious, it will greatly reduce the efficiency of pulp washing, and bring great difficulties to conveying and bleaching, affect the quality of pulp, seriously affect production efficiency, and increase the risk of environmental pollution. [0003] At present, defoamers commonly used in industry are usually divided into three categories: polyether defoamers, organic defoamers and silicone defoamers. Compared with the other two defoamers, silicone defoamer has the advan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/12D21H17/59
Inventor 李晓天
Owner JIANGSU SAIOUXINYUE DEFOAMER
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