Method of preparing a microcapsule for self-repairing of cement base material by adopting in situ polymerization method
A cement-based material, in-situ polymerization technology, applied in the direction of microcapsule preparation, microsphere preparation, etc., can solve the problems of high cost, complex synthesis process, raw material failure after long-term storage, and achieve the effect of avoiding the harm of toxic substances
Inactive Publication Date: 2014-08-13
TONGJI UNIV
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Problems solved by technology
In the existing research results, most of the prepared microcapsules use urea-formaldehyde polymer as the capsule wall. This synthesis process first synthesizes urea-formaldehyde prepolymer under high temperature and normal pressure conditions. Due to the volatility of formaldehyde solution , in the reaction process, toxic gases or harmful substances are inevitably produced, and the raw materials used in such methods are prone to long-term failure
The synthesis process of urea-formaldehyde microcapsules is relatively complicated and the cost is high
Method used
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Embodiment 1-2
[0037] Preparation of microcapsules with self-healing properties. The ratio of the mass of microcapsule particles to the finished product of microcapsules, that is, the total mass of the microcapsule emulsion system, is the solid content of the microcapsules. Example 1 and Example 2 respectively provide the optimal ratio of raw materials for preparing microcapsules with two different solid contents. The solid content of the microcapsules in Example 1 is 20%, and the solid content of the microcapsules in Example 2 is 40%. The ratio of raw materials is as follows (the raw materials used in this embodiment are all purchased by direct manufacturers, wherein, styrene needs to be processed according to the pretreatment method of the present invention):
[0038] Table 1 Embodiment 1-2 proportioning
[0039] raw material Example 1 Example 2 Epoxy resin / part 9 14 Styrene / part 1 1.5 Benzyl alcohol / part 1.5 2 Sodium dodecylbenzene sulfonate / part ...
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The present invention relates to the field of bionic self-repairing cement base material. The invention provides a method of preparing a microcapsule for self-repairing of cement base material by adopting an in situ polymerization method. The method comprises: 1, diluting epoxy resin; 2, taking another container, adding deionized water, high activity emulsifying agent and surface active reagent, and carrying out stirring and dispersing to obtain an emulsified dispersion aqueous solution; 3, adding the emulsified dispersion aqueous solution to the container used in step 1 and emulsifying with stirring; 4, adding styrene to the product of step 3 according to a mass ratio of styrene to epoxy resin poured in the beginning ranging from 1:8 to 1:12; 5, carrying out vacuum pumping and obtaining an inert atmosphere, carrying out heating and polymerization reaction in an oil bath; 6, adding potassium persulfate to catalyze the reaction and obtaining the final product microcapsule emulsion. The preparation method provided in the invention is simple and the problem of toxic substances produced during the synthesis process is well solved.
Description
technical field [0001] The invention relates to the field of bionic self-repairing cement-based materials, and the main research object is to prepare microcapsules with self-repairing function by an in-situ polymerization method, which can be widely used in repairing cracks of cement-based materials. Background technique [0002] As the most widely used material in the field of construction today, the service life of concrete depends largely on its damage. As a typical failure form of concrete materials, cracks have an important impact on the safety and applicability of concrete structures. At present, although there are a large number of traditional methods for repairing concrete cracks, these traditional methods are mainly for post-event repairs and regular maintenance of concrete structures. Not only the repair effect is not obvious, but also a lot of costs will be incurred. [0003] In recent years, with the research and application of smart materials, smart concrete wi...
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IPC IPC(8): C04B24/26C04B24/28C08F112/08B01J13/18
Inventor 蒋正武赵楠李文婷
Owner TONGJI UNIV