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A kind of preparation method of high dispersion, high solid content slurry titanium dioxide

A technology with high solid content and high dispersion, applied in chemical instruments and methods, dyeing polymer organic compound treatment, fibrous fillers, etc., can solve the problems of weather resistance and storage stability, low solid content of titanium dioxide, high production cost, etc. problems, achieve the effect of improving dispersion, increasing solid content, and saving energy consumption

Active Publication Date: 2022-05-06
LOMON BILLIONS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the slurry titanium dioxide preparation process mainly contains two kinds: one is dry powder pulping such as patent DE2611768, GB1596999, WO03008511, WO0214415, etc. Although this route has high solid content (more than 70%), the production cost is high, and the dust hazard in the production process is relatively high. The second is three-wash cake pulping such as patents EP0035076, US4115144, EP065738, GB1017475, etc. Although the pulping cost of this process route is low, the production process makes the removal rate of titanium dioxide surface water lower than that of titanium dioxide powder. Low solid content of slurry titanium dioxide (up to about 65%) affects its weather resistance and storage stability

Method used

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  • A kind of preparation method of high dispersion, high solid content slurry titanium dioxide
  • A kind of preparation method of high dispersion, high solid content slurry titanium dioxide
  • A kind of preparation method of high dispersion, high solid content slurry titanium dioxide

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preparation example Construction

[0024] The preparation method of the slurry titanium dioxide with high dispersion and high solid content provided by the present invention includes the step of further performing wet coating treatment on the titanium dioxide slurry after inorganic surface treatment by using a water reducer.

[0025] According to the characteristics of titanium dioxide products, the present invention combines the water reducer with titanium dioxide by adopting a special treatment method. The water reducer is usually an anionic surfactant, and the polar hydrophilic group of the water reducer is directional adsorbed. On the particle surface, it associates with water molecules in the form of hydrogen bonds, and the hydrogen bond association between water molecules forms a stable water film on the particle surface, preventing direct contact between particles and increasing the inter-particle Excellent sliding ability, plays a lubricating role, improves the fluidity of the slurry, and can further imp...

Embodiment 1

[0036] Take the qualified slurry and dilute it to 300g / L, raise the temperature to 80°C, adjust the pH to 10.5 with sodium hydroxide solution, apply silicon-aluminum inorganic coating to it by conventional methods, then raise the temperature to 95°C, and add 5 ‰ water reducer Prad 1241 (polycarboxylate water reducer, water reducing rate ≥ 25) (the amount of water reducer added is calculated by the weight of dry titanium dioxide in the slurry), homogenized for 30 minutes, washed with water until the conductivity of the filter cake ≤ 80 μs / cm, and then add a small amount of water (just wet the filter cake) to the filter cake for beating and dispersion, and sand-mill the slurry through a 400-mesh sieve to obtain slurry titanium dioxide 1#.

Embodiment 2

[0038] Take the qualified slurry and dilute it to 300g / L, raise the temperature to 80°C, adjust the pH to 10.5 with sodium hydroxide solution, apply silicon-aluminum inorganic coating to it by conventional methods, raise the temperature to 95°C, and add 5‰ within 15 minutes Water reducing agent β-naphthalene sulfonate formaldehyde condensate (naphthalene-based high-efficiency water reducing agent, water reducing rate ≥ 20) (the amount of water reducing agent added is calculated by the weight of dry titanium dioxide in the slurry), homogenized for 30 minutes, washed with water until The conductivity of the filter cake is ≤80μs / cm, and then a small amount of water (just wet the filter cake) is added to the filter cake for beating and dispersion, and the slurry is sand-milled through a 400-mesh sieve to obtain the slurry titanium dioxide 2#.

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Abstract

The invention discloses a preparation method of high-dispersion and high-solid-content slurry titanium dioxide, which comprises the step of further performing wet coating treatment on the titanium dioxide slurry after inorganic surface treatment by using a water reducer. The present invention adopts a special treatment method, by coating the water-reducing agent on the surface of titanium dioxide in a film-coated manner, so that the polar hydrophilic groups of the water-reducing agent are directional adsorbed on the particle surface, and the surface of the titanium dioxide particle A kind of electric double layer is formed, which increases the ζ potential of the particle surface, and the particles repel each other due to the same-sex static electricity, destroying the flocculation structure, so that the particles are effectively dispersed, and the free water in the flocculation structure is released, which not only achieves reduction The effect of water can also greatly improve the dispersibility of the slurry, so that the slurry titanium dioxide with high dispersion and high solid content (about 76%) can be prepared.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide preparation, and in particular relates to a method for preparing slurry titanium dioxide with high dispersion and high solid content. Background technique [0002] Titanium dioxide is an inorganic pigment with the highest refractive index. Because of its high refractive index, it exhibits high whiteness and is widely used in coatings, papermaking, plastics, inks, chemical fibers, rubber and other fields. [0003] Due to the small particle size of titanium dioxide, a certain degree of dust will be generated during the production process, which will not only cause certain personal safety hazards for front-line packaging workers, but also cause certain pollution to the environment. In recent years, the voice of "energy saving and consumption reduction, green development" has become more and more loud, and slurry titanium dioxide, as a kind of titanium dioxide product, has the characteristics...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06C09C3/08C09C3/10
CPCC09C1/3692C09C3/063C09C3/10C09C3/08C09C3/041C09C3/006C01P2006/62C01P2006/63C01P2006/64C01P2006/90
Inventor 陈建立宋运萍王永珊曹青喜赵姗姗李瑞瑞冯亚阳杨德江郭永阳
Owner LOMON BILLIONS GRP CO LTD
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