Process for preparing core-shell type polysiloxane composite particles

A technology of composite particles and polysiloxane, which is applied in the field of preparation of polysiloxane composite particles, can solve the problems of complex emulsion polymerization system and large differences, etc.

Inactive Publication Date: 2008-04-16
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the polarity between the acrylic polymer as the core material and polysiloxane is usually very different, and the polymer as the core material is prepared by free radical polymerization, while polysiloxane is usually prepared by ring Produced by the ring-opening polymerization of siloxane, making the emulsion polymerization system more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step (1): in the reactor that thermometer, reflux condenser, agitator are equipped with, add 100g water, add the mixture of 1g phenyltrimethoxysilane and 1g methyltriethoxysilane, dropwise add 18% hydrochloric acid solution until the pH of the system is 1, the reaction temperature is 20° C., and the reaction time is 5 hours to obtain a silane hydrolyzate.

[0031] Step (2) Add 10 g of polystyrene microspheres with a particle size of 2.5 μm to the above silane hydrolyzate, stir and disperse evenly, add 0.1 mol / L ammonia solution to the above system, the pH is 7.5, and the reaction temperature is 10°C , reacted for 20 hours. The resulting product was filtered, washed, and dried at 150° C. for 10 hours to obtain 10.9 g of core-shell polystyrene / polysiloxane composite microspheres with a particle size of 2.6 μm. The core-shell weight percentage is 92%:8%.

Embodiment 2

[0033] React according to the same steps as in Example 1, except that the pH of the control system in step (1) is 6, and the reaction temperature is 80° C. to obtain 10.9 g of core-shell polystyrene / polysiloxane composite microspheres with a particle size of 2.6 μm. The core-shell weight percentage is 92%:8%.

Embodiment 3

[0035] React according to the same steps as in Example 1, except that 0.5 μm of butadiene-acrylonitrile-styrene copolymerized microspheres (wherein the mass ratio of butadiene, acrylonitrile and styrene is 70:20: 10) Instead of the above polystyrene microspheres, 1.4 g of core-shell poly(butadiene-acrylonitrile-styrene) / polysiloxane composite microspheres were obtained, with a particle size of 0.8 μm. The weight percentage of core-shell is 36%:64%.

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Abstract

The invention discloses a process for preparing core-shell polysiloxane complex particles. It includes the following steps: adding organosilane into mixtures of water and / or organic solvent to perform hydrolytic reaction with alkali or acid; mixing the obtained hydrolysate solution with polymer particles as core materials of core-shell complex particle or its dispersion, then adding alkaline substances to produce core-shell polysiloxane complex particles. The method of this invention even can produce core-shell particles with polysiloxane as its shell layer without core materials treatment by coupling agents, and can adopt various polymer particles with grain diameter of 0.01-100 mum as core materials, and can easily control the shell thickness of the complex particles. The invention can easily obtain the core-shell polysiloxane complex particles and has a high productivity, so it has an industrial production prospect.

Description

technical field [0001] The invention relates to a preparation method of polysiloxane composite particles, in particular to a core-shell type polysiloxane composite particle. Background technique [0002] Since polysiloxane has good properties, such as high and low temperature resistance, aging resistance, electrical insulation, ozone resistance, water repellency, flame retardancy and non-biological activity, it has a wide range of uses in many fields. The core-shell polysiloxane composite particles can be used as plastic toughening modifiers, coating components, pressure-sensitive adhesives, gap retainers for liquid crystal cells, cosmetic modifiers, etc. [0003] Attempts have been made to prepare core-shell composite particles with polymer particles as the core and polysiloxane as the shell. Such as Kan et al [Kan Chengyou, Kong Xiangzheng, Yuan Qing, et al. Morphological Prediction and its Application to the Synthesis of Polyacrylate / Polysiloxane Core / Shell Latex Particl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/06C08L83/04C08K5/54
Inventor 辛忠陆馨魏鹏
Owner EAST CHINA UNIV OF SCI & TECH
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