Defoaming active matter, preparation method thereof and defoaming agent

An active substance and defoaming technology, which is applied in the field of defoaming agents and defoaming active substances, can solve the problems of foam occupying space, operation fluctuation, and affecting reaction speed, etc., to achieve controllable preparation process, good defoaming ability, and avoid residue Effect

CN110898467AActive Publication Date: 2020-03-24ZHEJIANG XINAN CHEM INDAL GROUP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-03-24

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Abstract

The invention relates to the technical field of fine chemical preparations, in particular to a defoaming active matter, a preparation method thereof and a defoaming agent. The defoaming active mattercomprises the following raw materials by weight: 40-80 parts of terminal hydroxyl-containing polysiloxane, 2-20 parts of hydrogen-containing polyorganosilicone siloxane, 2-15 parts of filler, 0.5-10 parts of organic silicon resin, 5-20 parts of polyether modified polysiloxane, 5-20 parts of polyfluorosiloxane, 0.01-0.08 part of a basic catalyst and 1-20ppm of a dehydrogenation catalyst. By adopting the above raw materials and controlling the ratio, the prepared defoaming active matter has good affinity with water, then the defoaming active matter can be rapidly dispersed in water, and then canachieve rapid and long-term defoaming. Meanwhile, the defoaming active matter also has good defoaming capacity even if being violently shaken, and can achieve complete defoaming and avoid residual foams.
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Description

technical field

[0001] The invention relates to the technical field of fine chemical preparations, in particular to an antifoaming active substance, a preparation method thereof and an antifoaming agent. Background technique

[0002] In modern industrial production, foam is everywhere. Machine tanks for various processing fluids; various industrial cleaning pools; various industrial and agricultural products and preparations; various production links of petrochemical industry, water treatment, etc. Foam brings various problems to industrial production: In order to prevent foam overflow, the feed rate is forced to be reduced by 30% to 50%; foam overflow leads to waste of raw materials; foam occupies space, affects the reaction speed, and the production cycle is forced to be extended; foam will affect Product quality, such as paint, plastic products; the generation of foam will affect the stability of industrial production, resulting in operational fluctuations and unstable q...

Examples

preparation example Construction

[0066] Further, the embodiment of the present invention also provides a preparation method of an antifoaming active substance, comprising:

[0067] Mix and react polyorganosiloxane containing terminal hydroxyl group, polyorganosiloxane containing hydrogen, filler, silicone resin, polyether modified polysiloxane, polyfluorosiloxane basic catalyst and dehydrogenation catalyst The antifoam active is formed.

[0068] Specifically, the polyorganosiloxane containing terminal hydroxyl groups, the hydrogen-containing polyorganosiloxane and the dehydrogenation catalyst are subjected to a dehydrogenation polymerization reaction to obtain a 3D network polysiloxane with a micro-crosslinked structure; The micro-crosslinked structure is a three-dimensional network structure. Then, it further undergoes random copolymerization reaction with organic silicon resin, polyether modified polysiloxane, polyfluorosiloxane and filler to obtain defoaming active material.

[0069] Specifically, the po...

Embodiment 1

[0074]This embodiment provides a defoaming active substance, the raw materials of which include 60g polyorganosiloxane containing terminal hydroxyl group, 5g hydrogen-containing polyorganosiloxane, 10g fine filler, 3g silicone resin, 10g polyether modified polysilicon Oxane, 12g polyfluorosiloxane, 0.05g basic catalyst and 10ppm dehydrogenation catalyst.

[0075] The structural formula of hydroxyl-terminated polysiloxane is:

[0076]

[0077] Among them, the R group is -CH 3 , n=100.

[0078] The structural formula of hydrogen-containing polyorganosiloxane is as follows:

[0079]

[0080] Among them: R group is -CH 3 , n=28.

[0081] The structural formula of polyfluorosiloxane:

[0082]

[0083] Among them: R group is -CH 3 , n=80.

[0084] Among them, the hydroxyl-terminated polyorganosiloxane is a hydroxyl silicone oil with a dynamic viscosity of 200 mPa s; the hydrogen-containing polyorganosiloxane is a methyl hydrogen-containing silicone oil with a dynamic...

Embodiment 2

[0091] This embodiment provides an antifoaming active substance, the raw materials of which include 50g polyorganosiloxane containing terminal hydroxyl group, 2g hydrogen-containing polyorganosiloxane, 5g fine filler, 5g silicone resin, 18g polyether modified polysilicon Oxane, 20g polyfluorosiloxane, 0.01g basic catalyst and 20ppm dehydrogenation catalyst.

[0092] The structural formula of hydroxyl-terminated polysiloxane is:

[0093]

[0094] Among them, the R group is -CH 3 , n=190.

[0095] The structural formula of hydrogen-containing polyorganosiloxane is as follows:

[0096]

[0097] Among them: R group is -CH 3 , n=60.

[0098] The structural formula of polyfluorosiloxane:

[0099]

[0100] Among them: R group is -CH 3 , n=260.

[0101] Among them, the hydroxyl-terminated polyorganosiloxane is a hydroxyl silicone oil with a dynamic viscosity of 500 mPa s; the hydrogen-containing polyorganosiloxane is a methyl hydrogen-containing silicone oil with a dyn...