Easily secondarily modified polydopamine coated modified calcium carbonate powder with high reaction activity and preparation method of powder

Abstract

The invention discloses easily secondarily modified polydopamine coated modified calcium carbonate powder with high reaction activity. A polydopamine film is modified on the surface of calcium carbonate, the surface of the polydopamine film contains a large number of active functional groups, more possibility is provided for further modification of the calcium carbonate powder, the modified powder is modified by titanate coupling agents, modification effects are more excellent, oil absorption, dispersibility and surface affinity of the obtained calcium carbonate powder are effectively improved, reaction activity with various systems is higher, and the powder is more economical and efficient and wider in use range.

Description

technical field

[0001] The invention relates to the technical field of inorganic powder surface modification, in particular to a polydopamine-coated modified calcium carbonate powder with high reactivity and easy secondary modification and a preparation method thereof. Background technique

[0002] Calcium carbonate is a very common inorganic powder filler. It has the advantages of low price, non-toxic and tasteless, high whiteness and good hardness. It is widely used in rubber products, papermaking, ink, plastics, coatings and other fields. However, , calcium carbonate is essentially an inorganic mineral, which has poor affinity and compatibility with organic substances. Direct filling will lead to serious deterioration of product performance and severely limited scope of use. Therefore, calcium carbonate powder needs to be adjusted in practical applications. Modified treatment.

[0003] At present, the main modification methods include mechanical refinement, surface modif...