Can kaolin, calcium carbonate and silicon powder replace titanium white?

Titanium BF, known as Titanium Dioxide (TiO2), is a white inorganic pigment with the best opacity, non-toxicity, optimum brightness and whiteness, and is considered one of the best white inorganic pigments in the world. Titanium in 2016, in 2017, the environmental protection storm escalated, a comprehensive inspection of mining enterprises, shutdown is the norm, raw material supply is more tight, prompting titanium white tap prices, titanium , the market "up" sound. How to reduce the production cost of titanium and seek alternatives to titanium has become an urgent problem for many powder companies.
Inorance fillers have many advantages, such as abundant resources, low price, low toxicity, easy processing, etc., and are widely used in the field of color master grain filling gradient, under the premise of ensuring the performance of the 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.
the cost of titanium production would be greatly reduced if the TiO2 particle core could be replaced with a cheap and easy-to-use white material. Therefore, titanium alternative materials are composites or composites consisting of crystalline TiO2 and other materials.
are there alternatives to titanium BF?
1. Disorderly mixed titanium dioxide composite pigment: refers to titanium 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. 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-grain cladding modified process
grain-grain cladding modified method is a powerful mechanical grinding method to produce composite titanium, the method to calcium carbonate, kaolin, calcined kaolin and heavy crystal and other white mineral powder as the nuclear substrate, crystalline TiO2 (sharp titanium ore) Type and redstone type) for the cladding, using white mineral powder wet ultra-fine grinding and white mineral powder and crystalline TiO2 wet mixed grinding method, through the segmentation of solid particles refinement, surface hydroxyl transformation and mechanical chemical effects caused by the particle-particle clad modification reaction and other preparations.
can really replace titanium white, kaolin, calcium carbonate, silicon powder?
Chemical precipitation reaction - heat treatment crystallization process
chemical precipitation reaction - heat treatment crystallization process is the traditional method of preparing titanium dioxide coating composite materials, that is, titanium salt hydrolysis generated by hydrated titanium dioxide precipitation wrapped in the surface of inorganic particles as a substing, and then by roasting to crystallize titanium dioxide. Form a composite pigment with a crystal titanium dioxide modified layer on the surface.
Trough
the so-called titanium-white alternative is made by using inexpensive non-metallic minerals as the core, in its surface bread covered with a layer of TiO2 particles to reduce TiO2 dosing, thereby reducing 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, respectively, for cosmetics, coatings and paper and other industries.
However, at present, china's composite titanium research is still in the initial stage, product performance is not good, can only replace the maximum amount of titanium, 10% to 20%, the main reason is that the product cover force and other performance is too low.
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