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Preparation method of titanium dioxide for powder coating

A titanium dioxide and powder coating technology, applied in powder coatings, chemical instruments and methods, coatings, etc., can solve the problem of no powder coating strength and toughness optimization, no finished powder coating adhesion improvement, organic modifier and titanium dioxide combination. It can improve the coating effect, improve the coating efficiency, and improve the oil dispersion effect.

Active Publication Date: 2019-08-20
中钛集团焦作市裕盛钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the products prepared by this method do not improve the adhesion of the finished powder coating, nor optimize the strength and toughness of the powder coating after film formation.
[0009] CN102295846A discloses a modified titanium dioxide and a preparation method thereof. Polyacrylic acid and n-butanol with a molecular weight of 6000-8000 are used as surface modifiers, and the primary titanium dioxide is directly dry-coated under stirring, which solves the problem of organic modification. However, this method does not involve the improvement of the adhesion of powder coatings
[0010] CN103131299A discloses a powder coating containing nano-titanium dioxide. This product has high mechanical strength, strong weather resistance, and smooth coating surface, but this product does not improve its waterproof and mildew-proof ability

Method used

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  • Preparation method of titanium dioxide for powder coating
  • Preparation method of titanium dioxide for powder coating
  • Preparation method of titanium dioxide for powder coating

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0045] Those skilled in the art know that the coating film hardness of powder coatings, impact resistance and other indicators are key indicators for evaluating the quality of powder coatings, and as a commonly used additive in powder coatings, the mechanical properties of titanium dioxide will also have a negative impact on the finished product of powder coatings. big impact. Therefore, in the prior art, the surface of titanium dioxide is often coated with an inorganic layer to increase its mechanical properties.

[0046] Porous titanium dioxide particles can increase its specific surface area and improve dispersion, but it will affect the hardness of titanium dioxide particles. However, it is unexpectedly found in the present invention that porous titanium dioxide has better mechanical properties after inorganic coating.

[0047] Specifically, the operation steps are:

[0048] Scheme a is to only carry out inorganic coating on titanium dioxide. The specific steps are: take...

experiment example 2

[0060] Those skilled in the art know that, in the presence of an initiator, the polymerization of polyacrylic acid can be initiated by ultraviolet light provided by a high-pressure mercury lamp, thereby causing the curing of the polyacrylic acid-containing material.

[0061] However, when coating titanium dioxide, those skilled in the art do not want polyacrylic acid to polymerize, or only hope that polyacrylic acid polymerizes to a small extent, so as to ensure that the surface coating of titanium dioxide will not be affected. Therefore, when polyacrylic acid coats titanium dioxide, those skilled in the art generally would not think of introducing ultraviolet light.

[0062] On the other hand, those skilled in the art know that microwaves of appropriate power can heat the particles and at the same time promote the solid-phase deposition of gas molecules on the surface of the particles.

[0063] However, the present inventors unexpectedly found in experiments that when titaniu...

Embodiment 1

[0084] (1) Take industrial titanium dioxide, and use a centrifugal classifier for nano-scale particle classification to screen the titanium dioxide particles to a size between 50nm and 10μm.

[0085] (2) the titanium dioxide that step (1) obtains is added such as figure 1 As shown, the iron removal is carried out in the iron removal device equipped with a permanent magnet iron remover. The iron removal device includes: a feed pipe for iron removal, which is arranged on the shell of the iron removal device and extends to the inside of the iron removal device; a transmission mechanism, which includes a driving device, a driving roller, and a driven roller 1. Conveyor belt, the driving device is connected with the driving roller or the driven roller to provide power for the transmission mechanism, the driving roller and the driven roller are connected by a conveyor belt, and a permanent magnet is arranged on the axially outer edge of the driven roller The permanent magnetic slee...

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Abstract

The invention provides a preparation method of special titanium dioxide for a powder coating. The preparation method comprises the following steps of (1), screening the particle size of industrial titanium dioxide; (2), removing iron from the titanium dioxide; (3), preparing porous titanium dioxide; (4), inorganically cladding the surface of the titanium dioxide; (5), organically cladding the surface of the titanium dioxide; (6), drying to obtain a finished product. After the titanium dioxide prepared by the preparation method is applied to the powder coating, the powder coating is enabled to have better mechanical strength, meanwhile, is good in hydrophobicity and achieves the effects of resisting stains and preventing bacterial breeding.

Description

[0001] Technical field: [0002] The invention relates to the field of chemical production, in particular to titanium dioxide specially used for powder coatings and a preparation method thereof. [0003] Background technique: [0004] Titanium dioxide is considered to be a white pigment with the best performance in the world. It has high hiding power, weather resistance, color-removing power, etc. It is widely used in the field of coatings, and it is also an important component in powder coatings. Whiteness, hiding power, strength and toughness, etc. [0005] Powder coating is a new type of solvent-free 100% solid powder coating. It has the characteristics of no solvent, no pollution, recyclable, environmental protection, saving energy and resources, reducing labor intensity and high mechanical strength of the coating film. In recent years, the application of powder coatings has surpassed water-based coatings and high-solid coatings in the coatings industry. It has become one...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06C09C3/10C09D5/03C09D7/62
Inventor 徐英杰徐英豪
Owner 中钛集团焦作市裕盛钛业有限公司
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