Titanium dioxide, known as titanium dioxide (TiO2), is a white inorganic pigment with the best opacity, non-toxicity, optimum brightness and whiteness. It is considered to be the world's best white inorganic pigment. In 2016, titanium dioxide rose in abundance. In 2017, the environmental protection storm escalated. It was a normal inspection of mining enterprises. The shutdown of production was the norm. The supply of raw materials was more tight, prompting the price increase of titanium white faucets, and the market of titanium dioxide was “upâ€. How to reduce the production cost of titanium dioxide and seek alternatives to titanium dioxide have become an urgent problem for many powder enterprises.
Inorganic fillers have many advantages such as abundant resources, low price, low toxicity and easy processing. They are widely used in the field of masterbatch filling and modification, and effectively reduce the finished products under the premise of ensuring the performance of products. Such as calcium carbonate, talc, mica powder, barium sulfate, kaolin, etc., among which calcium carbonate is the most widely used.
In fact, the pigment properties of titanium white particles are manifested by optical properties, and the optical properties mainly depend on the surface properties of the TiO2 particles. Therefore, the core of the TiO2 particles hardly contributes to the optical properties.
If a cheap and readily available white material can be used in place of the TiO2 particle core, the cost of titanium white production will be greatly reduced. Therefore, the titanium white substitute material refers to a composite or composite material composed of crystalline TiO2 and other materials.
What are the alternatives to titanium dioxide?
1. Disordered mixed titanium dioxide composite pigment: refers to a composite material in which titanium white powder and other white pigments or white fillers are mixed by powder. The TiO2 in the material is weakly combined with other pigments or fillers by electrostatic force, adhesion and van der Waals force, and the phenomenon of agglomeration between the composite particles, between the crystalline TiO2 particles and between other pigment particles is serious. Therefore, the titanium white substitute material thus formed has poor pigment properties and a small substitution amount for titanium white.
2. Ordered agglomerated titanium dioxide composite pigment: refers to a composite powder obtained by combining a white titanium crystal TiO2 with other white pigments or white fillers by agglomeration.
3. Titanium dioxide coated composite pigment: titanium dioxide coated composite pigment: inorganic material particles coated with crystalline TiO2 layer to form inorganic particles-TiO2 composite particle material, namely titanium dioxide coated composite material. Due to the TiO2 nature of the surface, this type of material exhibits good pigment properties and can be applied in a large proportion or completely in place of titanium dioxide. Different from the former two materials, inorganic particles-TiO2 composite particles are mainly composed of inorganic materials, and the proportion of TiO2 is low. Therefore, such alternatives reduce the amount of TiO2 and the cost of use are very significant, and currently there are two preparation methods of particle-particle modified coating and chemical precipitation coating.
Particle-particle coating modification process
The granule-grain coating modification method is an improved process for producing composite titanium white powder by strong mechanical grinding method. The method uses a white mineral powder such as calcium carbonate, kaolin, calcined kaolin and barite as a core-coated matrix, and crystalline TiO2 (arsenic) The ore type and rutile type are coating materials, using white mineral powder wet superfine grinding and white mineral powder and crystalline TiO2 wet blending grinding method, through the division and refinement of solid particles, surface hydroxylation transformation and machinery It is prepared by the particle-particle coating modification reaction caused by the force chemical effect.
Who can really replace titanium white, kaolin, calcium carbonate, silicon micropowder?
Chemical precipitation reaction-heat treatment crystallization process
The chemical precipitation reaction-heat treatment crystallization process is a conventional method for preparing a titanium dioxide-coated composite material, that is, a precipitate of hydrated titanium oxide formed by hydrolysis of a titanium salt is coated on the surface of the inorganic particles as a matrix, and then the titanium dioxide is crystallized by baking. A composite pigment having a crystalline titanium dioxide modified layer on its surface is formed.
summary
The so-called titanium white substitute is made by using a cheap inorganic non-metallic mineral as a core and coated with a layer of TiO2 particles on the surface to reduce the amount of TiO2, thereby reducing the cost. In recent years, China has developed composite titanium dioxide with non-metallic minerals such as mica, kaolin, talc, wollastonite and calcium carbonate as the core, which are used in cosmetics, coatings and papermaking industries.
However, the research on composite titanium dioxide in China is still in its infancy, and the product performance is not good. It can only replace 10%~20% of titanium dioxide. The main reason is that the hiding power of the product is too low.
Inorganic fillers have many advantages such as abundant resources, low price, low toxicity and easy processing. They are widely used in the field of masterbatch filling and modification, and effectively reduce the finished products under the premise of ensuring the performance of products. Such as calcium carbonate, talc, mica powder, barium sulfate, kaolin, etc., among which calcium carbonate is the most widely used.
In fact, the pigment properties of titanium white particles are manifested by optical properties, and the optical properties mainly depend on the surface properties of the TiO2 particles. Therefore, the core of the TiO2 particles hardly contributes to the optical properties.
If a cheap and readily available white material can be used in place of the TiO2 particle core, the cost of titanium white production will be greatly reduced. Therefore, the titanium white substitute material refers to a composite or composite material composed of crystalline TiO2 and other materials.
What are the alternatives to titanium dioxide?
1. Disordered mixed titanium dioxide composite pigment: refers to a composite material in which titanium white powder and other white pigments or white fillers are mixed by powder. The TiO2 in the material is weakly combined with other pigments or fillers by electrostatic force, adhesion and van der Waals force, and the phenomenon of agglomeration between the composite particles, between the crystalline TiO2 particles and between other pigment particles is serious. Therefore, the titanium white substitute material thus formed has poor pigment properties and a small substitution amount for titanium white.
2. Ordered agglomerated titanium dioxide composite pigment: refers to a composite powder obtained by combining a white titanium crystal TiO2 with other white pigments or white fillers by agglomeration.
3. Titanium dioxide coated composite pigment: titanium dioxide coated composite pigment: inorganic material particles coated with crystalline TiO2 layer to form inorganic particles-TiO2 composite particle material, namely titanium dioxide coated composite material. Due to the TiO2 nature of the surface, this type of material exhibits good pigment properties and can be applied in a large proportion or completely in place of titanium dioxide. Different from the former two materials, inorganic particles-TiO2 composite particles are mainly composed of inorganic materials, and the proportion of TiO2 is low. Therefore, such alternatives reduce the amount of TiO2 and the cost of use are very significant, and currently there are two preparation methods of particle-particle modified coating and chemical precipitation coating.
Particle-particle coating modification process
The granule-grain coating modification method is an improved process for producing composite titanium white powder by strong mechanical grinding method. The method uses a white mineral powder such as calcium carbonate, kaolin, calcined kaolin and barite as a core-coated matrix, and crystalline TiO2 (arsenic) The ore type and rutile type are coating materials, using white mineral powder wet superfine grinding and white mineral powder and crystalline TiO2 wet blending grinding method, through the division and refinement of solid particles, surface hydroxylation transformation and machinery It is prepared by the particle-particle coating modification reaction caused by the force chemical effect.
Who can really replace titanium white, kaolin, calcium carbonate, silicon micropowder?
Chemical precipitation reaction-heat treatment crystallization process
The chemical precipitation reaction-heat treatment crystallization process is a conventional method for preparing a titanium dioxide-coated composite material, that is, a precipitate of hydrated titanium oxide formed by hydrolysis of a titanium salt is coated on the surface of the inorganic particles as a matrix, and then the titanium dioxide is crystallized by baking. A composite pigment having a crystalline titanium dioxide modified layer on its surface is formed.
summary
The so-called titanium white substitute is made by using a cheap inorganic non-metallic mineral as a core and coated with a layer of TiO2 particles on the surface to reduce the amount of TiO2, thereby reducing the cost. In recent years, China has developed composite titanium dioxide with non-metallic minerals such as mica, kaolin, talc, wollastonite and calcium carbonate as the core, which are used in cosmetics, coatings and papermaking industries.
However, the research on composite titanium dioxide in China is still in its infancy, and the product performance is not good. It can only replace 10%~20% of titanium dioxide. The main reason is that the hiding power of the product is too low.
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