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Organic silicone defoaming agent for PVC and preparation method thereof

A silicone defoamer and defoamer technology, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve the problems of demulsification and stratification, poor stability, etc., achieve good compatibility, improve High temperature stability, the effect of improving stability

Active Publication Date: 2019-07-16
乌鲁木齐市华泰隆化学助剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the relatively poor stability of the existing silicone antifoaming agent for PVC, which is prone to demulsification and delamination after being placed for a certain period of time, and the defoaming and antifoaming effect at high temperatures needs to be further improved, providing A kind of silicone defoamer for PVC and preparation method thereof

Method used

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  • Organic silicone defoaming agent for PVC and preparation method thereof
  • Organic silicone defoaming agent for PVC and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of a silicone defoamer for PVC in this embodiment comprises the following steps: adding 1% polyacrylic acid mother liquor into 75% deionized water, stirring for 20 minutes, and then adding 1% acid-base adjustment Slowly adjust the pH of the stable water to 6. When the pH of the stable water is stable, the solution is transparent. Stir for 10 minutes. Add 15% of the main defoamer polyether silicone oil and 8% of the auxiliary defoamer. Water-soluble ether, stirred for 30 minutes, then sheared for 10 minutes.

[0035] Sample performance test:

[0036] 1. Thermal stability:

[0037] After the sample was placed in an oven at a temperature of 100 degrees for 1 hour, it was observed that there was no layered precipitation in the sample aqueous solution.

[0038] 2. Normal temperature stability test

[0039] Place the sample at room temperature for 3 months, the sample has no delamination phenomenon, and the state is good and the fluidity is good.

...

Embodiment 2

[0043] The preparation method of a silicone defoamer for PVC in this embodiment comprises the following steps: adding 1.5% polyacrylic acid mother liquor into 75% deionized water, stirring for 20 minutes, adding 1.5% acid-base regulator hydrogen Sodium oxide solution, adjust the pH of the stable water to be 6, when the pH of the stable water is stable, the solution is transparent, add 13% of the main defoamer modified silicon (polyether silicone oil), 9% of the auxiliary defoamer water-soluble ether , stirred for 30 minutes, then sheared for 10 minutes. The stability and the defoaming and anti-foaming effect of the defoamer obtained in this embodiment are closer to those in Example 1.

Embodiment 3

[0045] A preparation method of a silicone defoamer for PVC in this embodiment comprises the following steps: adding 2% polyacrylic acid mother liquor into 79% deionized water, stirring for 15 minutes, adding 2% hydrogen as an acid-base regulator Sodium oxide solution, adjust the pH of the stable water to be 7, when the pH of the stable water is stable, the solution is transparent, add 10% of the main defoamer modified silicon (polyether silicone oil), 7% of the auxiliary defoamer water-soluble ether , stirred for 25 minutes, then sheared for 5 minutes. The stability and the defoaming and anti-foaming effect of the defoamer obtained in this embodiment are closer to those in Example 1.

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Abstract

The invention discloses an organic silicone defoaming agent for PVC and a preparation method thereof, and relates to industrial defoaming agents. The organic silicone defoaming agent comprises the following components in percent by mass: 10-20% of a main defoaming agent; 5-10% of an auxiliary defoaming agent; 1-2% of suspended stable water; 70-80% of deionized water; and 1-3% of an acid-base regulator. The preparation method comprises the following steps: firstly adding a stable water mother liquid to the deionized water, performing stirring for 15-20 minutes, adding the acid-base regulator, slowly regulating the pH of the stable water to be 6-7, then adding the main defoaming agent of modified silicon and the auxiliary defoaming agent of water-soluble ether when the stable water pH is stable and the solution is transparent, performing stirring for 25-30 minutes, and finally performing shearing treatment to obtain the organic silicone defoaming agent. The organic silicone defoaming agent for PVC can make the defoaming agent have good antifoaming effects under high temperature conditions, the production process of the organic silicone defoaming agent is simple, and the storage of the organic silicone defoaming agent is stable.

Description

technical field [0001] The invention belongs to the technical field of defoamers for industrial use, and more specifically relates to a silicone defoamer for PVC and a preparation method thereof. Background technique [0002] In the process of producing PVC resin by the suspension method, a large amount of dispersant is added to the polymerization kettle. Under the action of high temperature stirring, a large amount of foam will be generated in the polymerization kettle, and vinyl chloride monomer is entrained in the foam, which occurs on the top of the kettle and the surface of the condenser. The polymerization reaction produces a large amount of sticky wall matter and blocks the header leading to the reflux condenser from the top of the kettle, seriously affecting the normal progress of the polymerization reaction in the kettle. In addition, if the foam cannot be quickly eliminated, it will lead to the occurrence of foam overflow in the polymerization tank, and during the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0404B01D19/0409B01D19/0422
Inventor 闫世友魏琪赵强马豪杰
Owner 乌鲁木齐市华泰隆化学助剂有限公司
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