Antifoaming agent containing organosilicone modified castor oil for PVA (Polyvinyl Alcohol) production and preparation method of antifoaming agent

A silicone modification, castor oil technology, applied in the direction of foam dispersion/prevention, can solve the problems of affecting the defoaming performance of the defoamer, difficult polyether preparation operations, complicated processes, etc., to improve the defoaming ability and suppress foam. The effect of strong ability and simple process

Active Publication Date: 2018-01-09
XIAN SUNY FINE CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They are often complex in process, and the preparation and operation of polyether is difficult, and the polyether chain is also prone to oxidation and chain scission in the air, and it will also have a negative impact on the adhesion of the slurry and the mechanical properties of the size film, thereby affecting The defoaming performance of this type of defoamer

Method used

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  • Antifoaming agent containing organosilicone modified castor oil for PVA (Polyvinyl Alcohol) production and preparation method of antifoaming agent
  • Antifoaming agent containing organosilicone modified castor oil for PVA (Polyvinyl Alcohol) production and preparation method of antifoaming agent
  • Antifoaming agent containing organosilicone modified castor oil for PVA (Polyvinyl Alcohol) production and preparation method of antifoaming agent

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preparation example Construction

[0026] The preparation method of the organosilicon-modified castor oil defoamer that is used in the production of PVA of the present invention comprises:

[0027] 1) First put the hydrogen-containing silicone oil and castor oil with a molar ratio of 1:0.5-2.5 in the reaction kettle, and stir for 20-30 minutes at a pressure ≤ -0.09MPa and a temperature of 80-95°C to remove water and low boiling point Impurity treatment, then add the chloroplatinic acid catalyst of total mass 0.01~1%, in N 2 In the air, heat up at 80-95°C and keep warm for 0.5-5h; react to obtain the active substance of silicone modified castor oil defoamer;

[0028] Among them, the hydrogen content of hydrogen-containing silicone oil is 0.05-0.2%.

[0029] 2) According to the mass ratio of (15-30): (2-5): (3-12): (5-15): (2-8) to take the silicone modified castor oil defoamer active material, Microcrystalline wax, monoglyceride, isooctyl stearate and emulsifier are placed in the reaction kettle at a stirring ...

Embodiment 1

[0039] Put the hydrogen-containing silicone oil and castor oil with a molar ratio of 1:0.5 in the reactor, mix and stir, then put the system under pressure ≤ -0.09MPa, temperature 95°C, and stir for 20 minutes to remove water and low-boiling impurities, and then add The total mass of 0.1% chloroplatinic acid catalyst, in N 2 Raise the temperature in the environment and react to prepare the active substance of the defoamer and cool it out. Among them, the hydrogen content in hydrogen-containing silicone oil is 0.1%, and the ratio of hydrogen-containing silicone oil to castor oil is 1:0.5. 2 Then heat up at 80°C and keep it warm for 1.5h; finally, use the active hydrogen chemical titration method to detect the hydrogen content in the reaction system until the reaction conversion rate reaches more than 95%, that is, the silicone-modified castor oil defoamer active substance is obtained.

[0040] 2) Take 20g of silicone-modified castor oil defoamer active substance, 5g of microcr...

Embodiment 2

[0043] Put the hydrogen-containing silicone oil and castor oil with a molar ratio of 1:2.5 in the reactor, mix and stir, then put the system under pressure ≤ -0.09MPa, temperature 85°C, and stir for 30 minutes to remove water and low-boiling impurities, and then add The total mass of 0.01% chloroplatinic acid catalyst, in N 2 Raise the temperature in the environment and react to prepare the active substance of the defoamer and cool it out. Among them, the hydrogen content in hydrogen-containing silicone oil is 0.05%, and the ratio of hydrogen-containing silicone oil to castor oil is 1:2.5. 2 Afterwards, the temperature was raised to 85° C. and kept for 0.5 h; finally, the hydrogen content in the reaction system was detected by the active hydrogen chemical titration method until the reaction conversion rate reached more than 95%, and the organic silicon modified castor oil defoamer active substance was obtained.

[0044] 2) Take 25g of silicone-modified castor oil defoamer act...

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Abstract

The invention discloses an antifoaming agent containing organosilicone modified castor oil for PVA (Polyvinyl Alcohol) production and a preparation method of the antifoaming agent and belongs to the field of organosilicone modified antifoaming agents. The preparation method comprises the following steps: carrying out an addition reaction between hydrogen containing silicone oil and castor oil in an N2 protective catalyst system so as to obtain an organosilicone modified castor oil antifoaming agent active matter; and by utilizing the modified antifoaming agent active matter as well as microcrystalline wax, monoglyceride, isooctyl stearate, an emulsifier, a thickening agent and a carrier, thereby obtaining the antifoaming agent containing organosilicone modified castor oil. The antifoamingagent containing organosilicone modified castor oil produced according to the method disclosed by the invention is applied to eliminating foam produced in PVA production, has tiny negative effects onadhesiveness of slurry and mechanical property of slurry membranes, and has the characteristics of being small in dose, high in antifoaming speed, high in foam inhibition ability, nontoxic, harmless,simple in process and the like.

Description

technical field [0001] The invention relates to the technical research and development field of fine chemicals, in particular to a method for preparing an organosilicon-modified castor oil defoamer used in PVA production. Background technique [0002] Defoamers are used to suppress and eliminate various harmful foams. They are relatively effective chemical methods to control foams. They are widely used in chemical, pharmaceutical, textile, printing and dyeing, mineral processing, paint and sewage treatment and other fields. Usually, in industrial production, foam will bring about factors that are unfavorable to production, such as reduced production capacity, waste of pigments, and decline in product quality. Conventional defoamers have certain specificity, because the foaming mechanism of each foaming system is different, resulting in different defoaming agents required for different foaming systems. In the production of PVA, due to the existence of the acetyl group in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
Inventor 孙九立高源马增超王魁江杜金洲解传梅陈小寒郭睿
Owner XIAN SUNY FINE CHEM
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