Source Lei tells you how to carry out surface modification of heavy calcium carbonate?

Release time:

2024-01-29 09:37


Source Lei tells you how to carry out surface modification of heavy calcium carbonate?


Surface modification is one of the most important deep processing technologies for heavy calcium carbonate and ultrafine heavy calcium carbonate. At present, the surface modification of heavy calcium carbonate is mainly based on organic coating and composite modification.


1. Organic coating modification of heavy calcium carbonate


Organic coating modification is based on organic matter, such as stearic acid and its salts, aluminate coupling agent, titanate coupling agent, water-soluble polymer, etc. as surface coating/modifier, the heavy calcium carbonate powder is coated to modify the method.


at present,Dry modification is the mainstream process of heavy calcium carbonateUnless the wet ultrafine grinding process is used, wet modification is rarely used.


The dry modification process is a process in which the powder is dispersed in a surface modification device in a dry state or after drying, and a surface modifier is added at a certain temperature. With the rapid growth of market demand for surface modification products and the improvement of product quality uniformity, stability and other requirements, enterprises mainly use continuous powder surface modification equipment.


2. Heavy calcium carbonate compound modification


Composite modification is the use of physical or chemical methods in heavy calcium carbonate or ultrafine heavy calcium carbonate powder evenly mixed or coated on the surface of the particle surface of another inorganic powder surface modification method, such as heavy calcium carbonate in the composite magnesium hydroxide or aluminum hydroxide, the modified heavy calcium carbonate powder for cable filler, in addition to the original function, but also has a flame retardant function.


In the industrial production of heavy calcium carbonate,There are also some heavy calcium carbonate surface modification and fine grinding or ultra-fine grinding simultaneously, That is, the surface modifier is added in the process of fine grinding and ultra-fine grinding, and the fine grinding/ultra-fine grinding and surface modification of heavy calcium carbonate are simultaneously completed in the same equipment. For example, the surface modification of ground calcium carbonate filler for unsaturated polyester-based composite materials (artificial stone) is carried out in a vertical roller mill fine grinding process.









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