Wuhan University

Beijing University of Chemical Tehcnology

Shaopeng Wu

Xue Fei Duan

Min Wei

Yanjun Lin

Wenying Shi

Jianying Yu

Wei Du

Yi Gu

Jun Xie

Xiaobin Han

Electromagnetically-induced cement concrete crack self-healing diisocyanate microcapsules include raw materials, in parts by weight, comprising 15-55 parts of petroleum resin, 5-10 parts of paraffin, 5-10 parts of polyethylene wax, 3-10 parts of magnetic iron powder and 20-67 parts of diisocyanate. The diisocyanate microcapsules use the diisocyanate as a core material, and the petroleum resin/paraffin/polyethylene wax/magnetic iron powder mixture as the shell of the capsule. When micro cracks occur in the concrete, the crack propagation can break partial of the microcapsule inside, the diisocyanate inside the microcapsules flows out and diffuses into the crack and is subjected to a solidifying reaction with water in the concrete, so that the crack is repaired in time; and for the microcapsules that are not broken by cracks, external electromagnetic field can be applied to melt the shell to release the diisocyanate inside, thereby diffusing into cracks and solidify with water to repair them.

Electromagnetically-induced cement concrete crack self-healing diisocyanate microcapsules and their preparation method

The present invention relates to a preparation method for a UV-shielding material based on Mg&#x2014;Al Layered Double Hydroxide. The material with multi-layered overlay structure is made from Mg&#x2014;Al double hydroxide layers and interlayer carbonate, its molecular composition is: MgAl(OH)(CO).mHO. The inorganic layers of this material can play a physical shielding role against UV, and the metal elements dispersed on the layer as well as the interlayer anion can play a great role in the chemical absorbing. In addition, by controlling the particle size and the amount of the layers, UV light can be effectively shielded by multi-level reflection and absorption of the multi-level layered structure. Therefore, the material with multi-level chemical and physical shielding properties has a good UV barrier effect for the anti-ageing asphalt, and could significantly increase its UV resistance properties.

UV-shielding material based on Mg&#x2014;Al layered double hydroxide and its application in anti-ageing asphalt

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Wuhan, China

Shaopeng Wu