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Long-chain alkyl silicone oil type silicon paste and preparation method and application thereof

A technology of long-chain alkyl silicone oil and silicone paste, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve the problem of limited storage stability of mineral oil defoamer, and achieve good dispersion and sedimentation stability. Good performance, good defoaming and anti-foaming performance

Active Publication Date: 2020-05-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This silicone paste is only a mixture of long-chain alkyl silicone oil and hydrophobic silica. After it is prepared as a defoamer, due to the difference in density between fumed silica particles and mineral oil, it settles after standing still for a few days or for a period of time. effect, resulting in limited storage stability of mineral oil defoamers

Method used

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  • Long-chain alkyl silicone oil type silicon paste and preparation method and application thereof
  • Long-chain alkyl silicone oil type silicon paste and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The ratio of the number of moles of hydrogen in hydrogen-containing silicone oil to the moles of vinyl groups of dodecene is 1:1.10. Take by weighing 24.20g 1-dodecene and add in the there-necked flask, under the condition of 75 ℃, logical nitrogen 30min, remove the moisture content in the flask and the raw material; Then add the chloroplatinic acid catalyst (platinum metal concentration of 5000ppm), and stir evenly; then add 75.00g of hydrogen-containing silicone oil with a hydrogen content of 0.18% and a viscosity of 150mpa·s. Add 6.33g of modified silicon gas HB-139 (Yichang Huifu Silicon Materials Co., Ltd.) and mix evenly. After pre-reacting at 90°C for 1 hour with heat preservation and stirring, the temperature is raised to 120°C for 2 hours to obtain a silicone paste.

Embodiment 2

[0037] The ratio of moles of hydrogen in hydrogen-containing silicone oil to vinyl moles of dodecene is 1:1.30. Take by weighing 28.55g 1-dodecene in the there-necked flask, under the condition of 90 ℃, nitrogen flow 30min, remove the moisture content in the flask and raw material; Then add the PT-2500 platinum catalyst (platinum metal concentration of 3.5ppm) of total material quality 2500ppm), and stir evenly; then add 75.00g of hydrogen-containing silicone oil with a hydrogen content of 0.18% and a viscosity of 150mpa·s. Add 6.43g of modified silicon gas HB-139 (Yichang Huifu Silicon Materials Co., Ltd.) and mix evenly. After pre-reacting at 90°C for 1 hour with heat preservation and stirring, the temperature is raised to 150°C for 1 hour to obtain a silicone paste.

Embodiment 3

[0039] The ratio of the number of moles of hydrogen in hydrogen-containing silicone oil to the moles of vinyl groups of dodecene is 1:1.20. Weigh 26.40g of 1-dodecene in a three-necked flask, and pass nitrogen gas for 30min at 80°C to remove the moisture in the flask and raw materials; then add a chloroplatinic acid catalyst with a total mass of 5ppm (platinum metal concentration is 5000ppm) , and stir evenly; then add 75.00 g of hydrogen-containing silicone oil with a hydrogen content of 0.18% and a viscosity of 150 mpa·s. Add 6.38g of modified fumed silica HB-139 (Yichang Huifu Silicon Materials Co., Ltd.) and mix evenly. After pre-reacting at 90°C for 1 hour with heat preservation and stirring, the temperature is raised to 110°C for 4 hours to obtain a silicone paste.

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Abstract

The invention discloses long-chain alkyl silicone oil type silicon paste and a preparation method and application thereof. The method comprises the following steps: adding 1-dodecene into a reactor, adding a platinum catalyst and hydrogen-containing silicone oil at 75-95 DEG C under the condition of nitrogen or inert gas, and performing uniform stirring; carrying out a pre-reaction for 0.5-1 h ata temperature of 65-95 DEG C, and then carrying out a reaction for 1-5 h at a temperature of 110-150 DEG C; after the pre-reaction is started for 0-4 hours, adding fumed silica; and ending the reaction to obtain the long-chain alkyl silicone oil type silicon paste. Silicon-hydrogen bonds of hydrogen-containing silicone oil react with hydroxyl groups on the surface of gas silicon to generate silicon-oxygen bonds, long-chain silicone oil molecules are connected to the surface of the gas silicon to prepare the silicon paste, and the dispersion stability of the silicon paste and the defoaming andfoam inhibition performance of the defoaming agent are improved.

Description

technical field [0001] The invention belongs to the field of defoamers, and in particular relates to a long-chain alkyl silicone oil-type silicone paste and a preparation method and application thereof. Background technique [0002] Long-chain alkyl silicone oil has excellent hydrophobicity, good compatibility with organic matter and low surface tension, so it is widely used in defoamers, but the defoaming and anti-foaming properties of long-chain alkyl silicone oil alone are limited , it needs to be compounded with silica particles and prepared into a silicone paste to significantly improve the defoaming and antifoaming performance. The particle size of fumed silica particles is between 5-8nm, because the nano-particles have a small particle size and a large surface energy, and they are agglomerated into large particles with a particle size between 0.2-5μm. In the traditional silicone paste preparation process, fumed silicon is under the condition of high-speed stirring an...

Claims

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Application Information

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IPC IPC(8): C08G77/38B01D19/04
CPCB01D19/0409C08G77/38
Inventor 潘朝群祝立强
Owner SOUTH CHINA UNIV OF TECH
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