Organic silicon defoamer for paper making industry and preparation method thereof

An organosilicon defoamer, a technology in the paper industry, applied in defoamers, papermaking, textiles and papermaking, etc., can solve the problem of loss of defoaming activity of silicone, limited effect of improving binding force, difficulty in controlling the amount of alkaline catalyst added, etc. low cost, good storage and dilution stability, and not easy to break the emulsion

Active Publication Date: 2014-03-26
SHENZHEN ANPIN SILICONE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The antifoaming agent in the above-mentioned prior art adds coupling agent or basic catalyst to strengthen the binding force between organosilicon and inorganic oxide particles in the preparation process, thereby improves the defoaming rate of defoaming agent particle and prolongs the defoaming rate of defoaming agent particle. The duration of foam activity and the ability to adapt to harsh conditions such as high temperature and strong alkali, but the effect of improving the binding force obtained by adding a coupling agent is limited, and the amount of basic catalyst added is difficult to control. Excessive amounts will easily cause silicone to lose its defoaming activity

Method used

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  • Organic silicon defoamer for paper making industry and preparation method thereof
  • Organic silicon defoamer for paper making industry and preparation method thereof
  • Organic silicon defoamer for paper making industry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation method of organosilicon defoamer for papermaking industry comprises the following steps:

[0048] Grinding MQ silicone resin with an M / Q value of 0.9 to a particle size of 5-20 μm to obtain MQ silicone resin particles;

[0049] Preparation of Emulsion A:

[0050] 300g of methyl silicone oil with a viscosity of 500000mPa·s at 25°C and 7g of a specific surface area of ​​238m 2 / g of hydrophobic fumed silica (manufactured by Guangzhou Jibisheng, HB-630), mixed with 25.5g of MQ silicone resin particles, stirred and mixed evenly at a low speed of 300rpm, heated to 230°C, and reacted at a high speed of 6000rpm for 2 Hours, until the mixed material is brown, close to brown, the reaction is considered complete, stop heating, stir and cool to below 80°C at a low speed of 300rpm, to obtain active composition A;

[0051] 7g sorbitan monostearate, 7.5g polyoxyethylene sorbitan monostearate and 1.5g ethylene glycol are mixed to obtain emulsifier, wherein sorbitan m...

Embodiment 2

[0058] The preparation method of organosilicon defoamer for papermaking industry comprises the following steps:

[0059] Grinding MQ silicone resin with an M / Q value of 0.4 to a particle size of 5-20 μm to obtain MQ silicone resin particles;

[0060] Preparation of Emulsion A:

[0061] 200g of hydroxyl silicone oil with a viscosity of 300000mPa·s at 25°C, 4g of a specific surface area of ​​150m 2 / g of hydrophobic fumed silica (manufactured by Guangzhou Jibisheng, HB-630) and 18.8g of MQ silicone resin particles were mixed, stirred and mixed evenly at a low speed of 250rpm, heated to 210°C, and reacted at a high speed of 5500rpm for 2 Hours, until the mixed material is brown, close to brown, the reaction is considered complete, stop heating, stir and cool to below 80°C at a low speed of 300rpm, to obtain active composition A;

[0062] Mix 8 g of sorbitan monooleate, 4 g of polyoxyethylene sorbitan monostearate and 5 g of fatty alcohol polyethylene glycol ether (Haian Petroch...

Embodiment 3

[0069] The preparation method of organosilicon defoamer for papermaking industry comprises the following steps:

[0070] Grinding MQ silicone resin with an M / Q value of 0.9 to a particle size of 5-20 μm to obtain MQ silicone resin particles;

[0071] Preparation of Emulsion A:

[0072] 200g of methyl silicone oil with a viscosity of 300000mPa·s at 25°C, 4.5g of a specific surface area of ​​260m 2 / g of hydrophobic fumed silica (manufactured by Degussa, AerosilR-812) and 33g of MQ silicone resin particles were mixed, stirred and mixed evenly at a low speed of 250rpm, heated to 250°C, and reacted for 2 hours under high-speed stirring of 5000rpm, Until the mixed material is brown, close to brown, the reaction is considered to be complete, stop heating, stir and cool at a low speed of 300rpm to below 80°C to obtain active composition A;

[0073] Mix 5.9g sorbitan monopalmitate, 3g polyoxyethylene sorbitan monooleate, 1.2g polyoxyethylene stearate (Haian Petrochemical, SG-6) with...

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Abstract

The invention discloses an organic silicon defoamer for a paper making industry and a preparation method thereof. The organic silicon defoamer is obtained by emulsifying an organic silicon defoaming composition comprising an active composition, an emulsifier and an additive, the active composition comprises polysiloxane, polyether modified silicone, hydrophobic fumed silica and MQ silicon resin particles, polysiloxane is methylsilicone oil or hydroxyl silicone oil with the viscosity of 10,000-50,000 mPA.s at 25 DEG C, the structural formula of polyether modified silicone is R(PO)b(EO)a(PO)-(Me2SiO)mSiMe2-(PO)(EO)a(PO)bR and/or R(PO)b(EO)a(PO)-(Me2SiO)mSiMe3, the particle sizes of the MQ silicon resin particles are 5-20 micron, and the specific surface area of hydrophobic fumed silica is 100-300 m<2>/g. The invention further provides the preparation method of the defoamer. The defoamer is prepared from organic silicon, hydrophobic fumed silica and the MQ silicon resin particles through a special process, has excellent defoaming efficiency and dedoaming activity durability, and is good in storage stability and dilution stability.

Description

technical field [0001] The invention relates to the technical field of defoamers, and relates to a silicone defoamer for papermaking industry and a preparation method thereof, in particular to a silicone defoamer used for defoaming in pulping and papermaking processes in papermaking and its preparation method. technical background [0002] In most industrial production processes, a large number of air bubbles will cause troubles, such as affecting production efficiency, causing equipment damage, and even causing production failure in severe cases. For example, in the pulping process of the papermaking process, natural substances such as fatty acids and resin acids contained in the pulping raw materials react with chemicals such as caustic soda and sulfide to form foaming substances such as fatty acid soaps and resin acid soaps, while The raw materials contain cellulose and other polymer substances that have a foam-stabilizing effect, causing the slurry to generate a large a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/12D21H17/59
Inventor 丁小卫钱柏太欧阳涛
Owner SHENZHEN ANPIN SILICONE MATERIAL
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