Nanoscale activated calcium carbonate and processing method thereof

Abstract

The invention discloses nanoscale activated calcium carbonate. The nanoscale activated calcium carbonate comprises calcite, a dispersant and a coupling agent; a mass part ratio of the calcium carbonate to the dispersant in a grinding process is 100:(0.2-5); and a mass part ratio of the dried nanometer calcium carbonate to the coupling agent in a high-speed mixing and stirring process is 100:(0.5-8). The method reduces the surface polarity of the nanometer calcium carbonate, so the surface of the nanometer calcium carbonate has strong oleophilic and hydrophobic properties, the dispersion property is improved, the dispersibility of the nanometer calcium carbonate in the composite material and the compatibility of the nanometer calcium carbonate with an organic high polymer are improved, andthe nanoscale activated calcium carbonate is obtained. The invention also discloses a processing method of the nanoscale activated calcium carbonate. The processing method comprises the following steps: 1, raw material washing; 2, choosing; 3, coarse crushing; 4, intermediate crushing; 5, addition of the dispersant, and grinding; 6, ATP grading (fine powder + coarse powder); 7, addition of the coupling agent, and high-speed mixing and stirring; and 8, cooling and packaging. The processing method adopting dry process modification has the advantages of low production cost, and suitableness for large-scale industrial production.

Description

technical field [0001] The invention relates to nanoscale active calcium carbonate and a processing method thereof. Background technique [0002] Calcium Carbonate (CaCO 3 ) is a widely used inorganic filler. Nano-calcium carbonate refers to calcium carbonate with a size on the order of nanometers. It is a new type of ultra-fine solid inorganic chemical material developed in the 1980s. Due to the ultra-fine size of nano-calcium carbonate particles, its crystal structure and surface electronic structure have changed, resulting in small size effects, surface and interface effects, quantum size effects, and macroscopic quantum tunneling effects that ordinary calcium carbonate does not have. , Catalyst, light and heat resistance and melting point have superior performance than conventional materials. Compared with ordinary calcium carbonate, it has the following characteristics: ① Small particles, with an average particle size of 40nm, which is one-tenth of ordinary light cal...

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Problems solved by technology

Nano-calcium carbonate has more excellent properties than ordinary calcium carbonate, and has four basic effects of nano-materials. However, compared with ordinary calcium carbonate, there are two disadvantages in the direct application of nano-calcium carbonate to organic media: ①The surface of nano-calcium carbonate is affinity Hydrophobic and oleophobic, with strong polarity, it is difficult to disperse uniformly in organic media, and the binding force with the base material is poor, which is easy to cause interface defects and lead to material performance degradation; The more, the higher the surface energy, the stronger the adsorption, and in a thermodynamically unstable state, the particles are easy to agglomerate with each other, and cannot be well dispersed in the polymer matrix, thus affecting the actual application effect of nanoparticles

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