Who can really replace titanium white kaolin, calcium carbonate, silicon powder?

Titanium Dioxide ( TiO2) is a white inorganic pigment with the best opacity, non-toxicity, best brightness and whiteness, and is considered one of the best white inorganic pigments in the world. Titanium white powder in 2016 crazy rise, in 2017, environmental protection storm upgrade, a comprehensive inspection of mining enterprises, shutdown is the norm, raw materials supply is more tight, prompting titanium white tap prices, titanium white powder market "up" sound. How to reduce the production cost of titanium dioxide and seek alternatives to titanium dioxide has become a difficult problem that many powder enterprises urgently need to solve.
Inorance fillers have many advantages, such as abundant resources, low price, low toxicity, easy processing, etc., are widely used in the field of chromosomal particle filling modified, in the premise of ensuring the performance of products, effectively reduce the finished products. Such as calcium carbonate, talcum powder, mica powder, sulphate, kaolin, etc. , of which calcium carbonate is the most widely used.
in fact, the pigment performance of titanium-white particles is reflected in optical properties, which depend mainly on the surface properties of TiO2 particles, so the TiO2 particle core contributes little to optical performance.
if the TiO2 particle core could be replaced with a cheap and easy-to-use white material, the cost of producing titanium white would be greatly reduced. Therefore, titanium alternative materials are composites or composites consisting of crystalline TiO2 and other materials.
are there alternatives to titanium dioxide?。 1. Disorderly mixed titanium dioxide composite pigment: refers to titanium white powder and other white pigments or white fillers are mixed with powder composite materials. The crystalline TiO2 in the material and the compounding of other pigments or fillers by static electricity, adhesion force and Van der Waal force to achieve a weak combination, complex particles, crystalline TiO2 particles between the other pigment particles reunion phenomenon is serious. Therefore, the pigment performance of the titanium-white substitute material is poor, and the replacement amount of titanium-white is small.
2. Ordered condensed titanium dioxide composite pigment: refers to the titanium white particle crystallization TiO2 and other white pigments or white fillers by the coagulation of the compound powder.
3. Titanium dioxide coating composite pigment: titanium dioxide coating composite pigment: inorganic material particle surface bread crystalline TiO2 layer to form inorganic particles - TiO2 composite particle material, that is, titanium dioxide coating composite material. Due to the TiO2 properties of the surface, this material presents better pigment properties and can be applied with a large proportion or a complete replacement of titanium dioxide. Unlike the first two materials, inorgic particles - TiO2 composite particles in the main inorgic materials, TiO2 ratio is low. As a result, such alternatives reduce TiO2 dosage and cost of use significantly, and there are currently two preparation methods: granular-granular modified envelope and chemical precipitation envelope.
-grain cladding modified processGrain-grain cladding modified method is an improved process for the production of composite titanium dioxide by powerful mechanical grinding method, which is based on white mineral powders such as calcium carbonate, kaolin, calcined kaolin and heavy crystalline, crystalline TiO2 (sharp titanium ore and redstone type) For the coating, the ultra-fine grinding method of white mineral powder and the method of mixed grinding of white mineral powder with crystalline TiO2 wet method are prepared by means of particle segmentation refinement, surface hydroxylation modification and particle coating modification reaction caused by mechanical chemical effects.
chemical precipitation reaction - heat treatment crystallization processChemical precipitation reaction - Heat treatment crystallization process is the traditional method of preparing titanium dioxide coating composite materials, that is, titanium dioxide hydrolysis generated by hydrated titanium dioxide precipitation wrapped in the surface of inorganic particles as a substation, and then by roasting to crystallize titanium dioxide. Form a composite pigment with a crystal titanium dioxide modified layer on the surface.
a smallThe so-called titanium-white alternative is made by using inexpensive non-metallic minerals as the core and coated with TiO2 particles on its surface bread to reduce TiO2 usage and thus reduce costs. In recent years, China has developed a mica, kaolin, talc, silica ash, calcium carbonate and other non-metallic ore as the core of the composite titanium dioxide, respectively, for cosmetics, coatings and paper and other industries.
However, at present, China's composite titanium dioxide research is still in its infancy, product performance is not good, can only replace the titanium dioxide 10% to 20% of the dosing, the main reason is that the product cover and other performance is too low.
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