Abstract
By the method of interfacial polymerization, the novel microcapsules were prepared with poly- styrene as wall material and polyether silicone as core material. In order to demonstrate the morphologies, parti- cle size distribution and properties of microcapsules, scanning electron microscopy (SEM), laser particle size analysis and infrared spectroscopy (FTIR) are also applied in the experiments, and the thermal stability of mi- crocapsules is obtained by thermal gravimetric (TG) and differential scanning calorimetry (DSC). The material ratio (core to wall in weight) of microcapsules and stirring rate ratio are discussed. The results show that under the optimum process conditions of a material ratio (core to wall in weight) which is 4:10 and agitating rate of 500r·min -1 , the synthesized polyether silicone microcapsules have a higher yield and the coating and densifica- tion properties; their average size is 210μm, and the thermal stability temperature can reach up to 390°C.
Highlights
Silicone oil has an extremely wide range of applications such as the key areas of cosmetics, hair products and machinery manufacturing [1]
As the polyurea formaldehyde is regarded as capsule material and the vinyl silicone oil as core, Ai Qiushi, MINORITIES, who adopts the method of a “two-step” and “one-step”, preparing a kind of self-repair microcapsules of vinyl silicone oil by in situ polymerization [4]
It needs to be slowly heated to 70–80°C and stirred for 5h at the speed of 400r/min for continuous reaction, a small amount of potassium persulfate solution is added to continue the reaction for 3h; samples are filtrated to separate and, they are washed with distilled water and anhydrous ethanol after the completed reaction; the polystyrene-coated polyether silicone after microcapsule samples are obtained through drying under vacuum
Summary
Silicone oil has an extremely wide range of applications such as the key areas of cosmetics, hair products and machinery manufacturing [1]. The introduction of polyether group of the polyether silicone provides good wettability, low surface tension and physiologically inert, and its products have advantages such as better moisture absorption, antistativity and cleaning easiness and so on [2]. It is rarely reported about the microencapsulation of silicone oil, especially the microencapsulation of polyether silicone oil, which has never been reported. The surface morphology of the microcapsules, the particle size characterization and the thermal stability are respectively characterized by scanning electron microscopy and laser particle size analysis, infrared spectroscopy and DTA-TGA It discusses how the capsule core ratio and the stirring rate affect the synthesis of polyether silicone oil microcapsules
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