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A kind of organosilicon modified unsaturated higher fatty alcohol ester defoamer and preparation method thereof

A technology of alcohol ester defoamer and high-grade fatty alcohol, which is applied in chemical instruments and methods, separation methods, foam dispersion/prevention, etc., and can solve the problems of ineffective defoaming of floating foam and surface foam, and poor water filtration of paper machines , poor water dispersibility and other problems, to avoid the problem of paper machine sticking rolls, fast defoaming speed, and strong foam suppression ability

Active Publication Date: 2022-05-13
ZHEJIANG TRANSFAR WHYYON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the analysis of molecular structure, the structure of modified higher alcohols can fundamentally solve some problems encountered. For example: 1. Due to the higher melting point of higher alcohols, it is easy to make the emulsion thicker during the preparation of higher alcohol defoamers It leads to delamination and agglomeration in a short period of time, and accompanied by the demulsification phenomenon, the water dispersibility becomes worse, which makes the water filtration of the paper machine worse, leads to the decrease of degassing performance and causes the sticking problem of the paper machine roll, resulting in paper defects
2. The high-carbon alcohol defoamer focuses on removing the tiny bubbles on the surface of the fiber in the pulp white water. It has no obvious defoaming effect on the floating foam and surface foam on the surface of the white water, and its antifoaming performance is relatively weak, which limits its application range.

Method used

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  • A kind of organosilicon modified unsaturated higher fatty alcohol ester defoamer and preparation method thereof
  • A kind of organosilicon modified unsaturated higher fatty alcohol ester defoamer and preparation method thereof
  • A kind of organosilicon modified unsaturated higher fatty alcohol ester defoamer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]1) Put octadecylenediol with a molar ratio of 1:0.8 and hydrogen-containing silicone oil with a hydrogen content of 0.05% in the reactor, start stirring and raise the temperature, set the pressure at -0.07MPa, and the temperature at 70°C. The time is 50min, carry out water removal, remove low-boiling impurity treatment, then turn off vacuum, add the 0.1% chloroplatinic acid catalyst of system material gross mass, in N 2 Under a protected environment, the temperature was raised to 95° C. and kept for 4 hours to terminate the reaction to obtain an intermediate.

[0042] 2) Put the intermediate and lauric acid with a molar ratio of 1:2.2 in another reactor and start stirring, start to heat up to 75°C, add 0.5% p-toluenesulfonic acid, turn on the vacuum to -0.08MPa, and start to heat up , the temperature was raised to 130° C. for 8 hours, then the vacuum was turned off, the temperature was lowered and the material was discharged to obtain the product.

[0043] 3) Take 10g o...

Embodiment 2

[0046] 1) Put dodecenol with a molar ratio of 1:1 and hydrogen-containing silicone oil with a hydrogen content of 0.1% in the reaction kettle, start stirring and heat up, set the pressure at -0.08MPa, the temperature at 80°C, and the time Be 30min, carry out dewatering, remove low-boiling impurity treatment, then turn off vacuum, add the 0.2% chloroplatinic acid catalyst of system material gross mass, in N 2 Under a protected environment, the temperature was raised to 105° C. and kept for 3 hours to terminate the reaction to obtain an intermediate.

[0047] 2) Put the intermediate and stearic acid with a molar ratio of 1:1.5 in another reactor and start stirring, start to heat up to 80°C, add 0.3% sulfamic acid, turn on the vacuum to -0.085MPa, and start to heat up , the temperature was raised to 140° C. for 6 hours, then the vacuum was turned off, the temperature was lowered and the material was discharged to obtain the product.

[0048] 3) Take 15g of silicone-modified unsa...

Embodiment 3

[0051] 1) Put octadecenol with a molar ratio of 1:2.5 and hydrogen-containing silicone oil with a hydrogen content of 0.15% in the reactor, start stirring and heat up, set the pressure at -0.09MPa and the temperature at 90 ℃, the time is 20min, carry out dehydration, remove the treatment of low-boiling point impurities, then turn off the vacuum, add 0.5% chloroplatinic acid catalyst of the total mass of the system material, in N 2 Under a protected environment, the temperature was raised to 125° C. and kept for 0.5 h to terminate the reaction to obtain an intermediate.

[0052] 2) Put the intermediate and behenic acid with a molar ratio of 1:0.85 in another reactor and start stirring, start to heat up to 95°C, add 0.1% methanesulfonic acid, turn on the vacuum to -0.09MPa, and start to heat up , the temperature was raised to 165° C. for 2 hours, then the vacuum was turned off, the temperature was lowered and the material was discharged to obtain the product.

[0053] 3) Take 2...

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Abstract

The invention discloses a silicone-modified unsaturated higher fatty alcohol ester defoamer and a preparation method thereof. The technical scheme adopted in the present invention is: first, in N 2 In the protected catalyst system, hydrogen-containing silicone oil and unsaturated higher aliphatic alcohol are added to obtain an intermediate, and then the intermediate and saturated fatty acid are esterified to obtain a silicone-modified unsaturated higher aliphatic alcohol ester. Emulsifying unsaturated higher fatty alcohol ester with mineral oil and emulsifier to prepare silicone modified unsaturated higher fatty alcohol ester defoamer. The defoamer prepared by the invention not only improves the emulsion stability of the defoamer itself, but also can be applied to papermaking wet cloth to enhance the water drainage performance of the paper machine, and has little negative impact on the mechanical properties of papermaking pulp and paper surface. It has the characteristics of fast defoaming speed, strong antifoaming ability, good degassing performance, non-toxic and harmless, and simple preparation process.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and relates to an auxiliary agent, in particular to an organosilicon-modified unsaturated higher fatty alcohol ester defoamer and a preparation method thereof. Background technique [0002] Defoamers are used to suppress and eliminate various harmful foams, and are a relatively effective chemical method for foam control. In the papermaking of cardboard, white cardboard, cultural paper and other paper types, although the silicone defoamer has high defoaming activity, it will also lead to the precipitation of silicone oil and affect the performance of paper; The main function is to suppress the generation of foam. Whether it is the tiny bubbles on the surface of the fiber or the floating foam on the surface of white water, the fatty acid ester defoamer has a good foam suppression effect, but the disadvantage is that the defoaming speed is slow and the degassing performance is not good. . The applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/04
CPCB01D19/0472
Inventor 王魁江杨磊查汪敏刘潇潇李华杰梁福根谢青宇李德品
Owner ZHEJIANG TRANSFAR WHYYON CHEM
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