Preparation method of vegetable oil modified polymer polyether defoamer

A technology for polymer polyether and vegetable oil modification, which is applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve problems such as immediate combustion and serious environmental hazards, and achieve low production costs, good stability, Effect of good spreading properties

Inactive Publication Date: 2020-07-24
JIANGSU STERRIC CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of the above two catalysts is very harmful to the environment. The preparation process needs to be heated to high temperature to easily decompose and release toxic gases, and it will burn immediately when it comes into contact with the foaming agent.

Method used

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  • Preparation method of vegetable oil modified polymer polyether defoamer
  • Preparation method of vegetable oil modified polymer polyether defoamer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Preparation method of Lewis acid-base pair catalyst

[0031] Composed of tris(dimethylamino)phosphorus and triethylboron, the molar ratio of tris(dimethylamino)phosphorus and triethylboron is 1:3; the preparation method of tris(dimethylamino)phosphorus is as follows:

[0032] (1) Add phosphorus trichloride (13.73 g, 0.1 mol, 1.0 equiv.) into a 500 mL three-necked flask equipped with a stirring magnet, add 50 mL of anhydrous dichloromethane under nitrogen protection, and place at -40 o C low temperature, keep stirring vigorously;

[0033] (2) Continuously feed excess gas of dimethylamine into the reaction system to maintain the solution temperature at -30 o After reacting below C for 1 h, stop feeding dimethylamine gas;

[0034] (3) After the reaction system dropped to room temperature, it was stirred for another 3 h, and the solvent was distilled off under reduced pressure to obtain a colorless solution, namely tris(dimethylamino)phosphorus.

[0035] 2. Preparatio...

Embodiment 2

[0039] 1. Preparation method of Lewis acid-base pair catalyst

[0040] With embodiment 1.

[0041] 2. Preparation method of rapeseed oil modified polymer polyether defoamer

[0042] (1) Under nitrogen protection, add methanol (5.5 g, 0.17 mol), tris(dimethylamino)phosphorus (1.6 g, 10.0 mmol) and triethylboron (29.4 g, 30.0 mmol) into a 1000 mL reaction flask , after stirring for 10 min, epoxy rapeseed oil (700 g) was added and reacted at room temperature for 2 h. Carry out decompression distillation to remove methanol in the reaction flask after the reaction, to obtain a mixture containing catalyst and rapeseed oil polyol initiator;

[0043](2) After repeated nitrogen replacement of the reaction flask containing the catalyst and rapeseed oil polyol initiator, propylene oxide (266 g, 4.59 mol) and ethylene oxide (150 g, 3.4 mol) were injected into the reactor ), reacted at room temperature for 12 h. After the reaction is finished, add a certain amount of acetic acid into t...

Embodiment 3

[0045] 1. Preparation method of Lewis acid-base pair catalyst

[0046] With embodiment 1.

[0047] 2. Preparation method of castor oil modified polymer polyether defoamer

[0048] (1) Under nitrogen protection, add methanol (5.5 g, 0.17 mol), tris(dimethylamino)phosphorus (1.6 g, 10.0 mmol) and triethylboron (29.4 g, 30.0 mmol) into a 1000 mL reaction flask , after stirring for 10 min, epoxy castor oil (500 g) was added and reacted at room temperature for 2 h. Carry out decompression distillation to remove methyl alcohol with the reaction bottle after reaction finishes, obtain the mixture containing catalyst and castor oil polyol initiator;

[0049] (2) After repeated nitrogen replacement of the reaction flask containing the catalyst and castor oil polyol initiator, propylene oxide (266 g, 4.59 mol) and ethylene oxide (150 g, 3.4 mol) were injected into the reactor respectively , reacted at room temperature for 12 h. After the reaction is over, add a certain amount of acet...

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Abstract

The invention discloses a preparation method of a vegetable oil modified polymer polyether defoamer, and the method comprises the following steps: by using epoxidized vegetable oil, fatty alcohol, ethylene oxide and propylene oxide as raw materials, carrying out ring-opening polymerization reaction under the action of a catalyst to obtain the vegetable oil modified polymer polyether defoamer. Thecatalyst Lewis acid-base pair catalyst is composed of PR3 and organoborane; the method is simple to operate and low in production cost, can perform ring-opening polymerization reaction of the epoxy compound at normal temperature to complete preparation of the polyether polymer, greatly reduces energy loss, and is harmless to the environment, safe and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of preparation of nonionic surfactants, and in particular relates to a method for preparing a vegetable oil-modified polymer polyether defoamer by using a Lewis acid-base pair catalyst. Background technique [0002] Defoamer is an indispensable additive in the production of modern chemical industry. It is mainly used to eliminate harmful foam caused by surface active substances, stirring and other recognized or non-identified factors in industrial production. In many industrial production processes, the existence of a large amount of foam often causes inconvenient operation, reduced equipment capacity and waste of raw materials, and even leads to product quality problems and huge economic losses. Therefore, how to effectively control and suppress foam in the production process is of great significance for improving production efficiency and product quality. [0003] At present, defoamers are widely used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28B01D19/04
CPCC08G65/2609C08G65/2675C08G65/2654C08G65/269B01D19/0404C08G2230/00
Inventor 肖龙强凌坤华侯琳熙赵玉来范阳海吴建康李玉珍纪明智
Owner JIANGSU STERRIC CHEM IND
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