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Cross-linkers are compounds that have at least two reactive groups that will react with the reactive groups on the surface-modified particles.
交联剂係具有至少两种反应性基团之化合物,该等反应性基团将与位于经表面改质粒子上之反应性基团反应。
The present invention relates to a new process for making microcapsules which does not require surfactant and which provides microcapsules having an increased, relatively high level of protection from u.v. light for the contents; the present invention involves the use of surface-modified particulate inorganic material to form microcapsule walls where a cross-linker is used to react with the surface-modified material such that each microcapsule wall is a cross-linked wall.
dispersing the solution into the slurry to form a Pickering emulsion and causing or allowing the cross-linker to react with the surface-modified particulate inorganic material so as to form a cross-linked microcapsule wall.
The surface-modified particles were then added to water and dispersed with an Ultrasonic Probe (Sonics and Materials, Vibra CellTM, with microtip - hereinafter referred to as an Ultrasonic Probe) operated under the following conditions: 50% Duty cycle; Output Control 4; for 6 minutes.
随后将该等经表面改质粒子添加至水中并使用超音波探针(Sonics and Materials, Vibra CellTM,具有微尖端-下文称作超音波探针)于下述条件下作业来实施分散处理:50%工作循环;输出控制4;持续6分钟。
The dispersion step results in a dispersion of the solution in the slurry which is stabilised as a Pickering emulsion by the surface-modified particulate inorganic material.
Addition of 5% w/w SynperonicTM NP8 did not cause the emulsion to break after a period of 1 week [see light microscope image, Figure 3b, taken after the addition of SynperonicTM NP8 and showing unbroken capsule dispersion] demonstrating that cross-linking anchored the surface-modified clay at the interface such that it was not displaced by the surfactant.
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