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A kind of preparation method of titanium dioxide for aluminum material electrophoretic coating coating

An electrophoretic coating and titanium dioxide technology, which is applied in the field of titanium dioxide, can solve the problems of electrophoretic tank electrification and coating film quality decline, accelerated corrosion, and large surface alkalinity.

Active Publication Date: 2021-11-02
HENAN BILLIONS NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the resins used are mostly alkaline resins (acrylic resins are cured with amino resins), which can ensure high decoration and high corrosion resistance of the coating film, but the surface alkalinity of titanium dioxide for electrophoretic coatings on the market is relatively large , difficult to be wetted
If the surface of titanium dioxide is not fully covered by resin, the surface of titanium dioxide will become a path for the diffusion of water molecules and oxygen molecules, accelerating corrosion
In addition, it takes about 6-8 months to replace all the electrophoretic paint in the electrophoretic tank. During this period, if Na + , SO 4 2～ etc., the conductivity of the electrophoresis tank and the quality of the coating film will decrease.

Method used

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  • A kind of preparation method of titanium dioxide for aluminum material electrophoretic coating coating

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Add distilled water to the initial product of sulfuric acid process titanium dioxide to make slurry, the concentration of the slurry is 500g / L (with TiO 2 meter), add sodium hexametaphosphate, and its total addition is TiO 2 0.05% of 0.05%, after sanding, sanding to a particle size of 0.290 μm, particle size distribution 2 temperature to 50°C; adjust the pH of the slurry to 8.0 with sodium metaaluminate solution (concentration: 160g / L) for 20 minutes, and then homogenize for 10 minutes; add sulfuric acid accounting for 1% of the mass fraction of titanium dioxide in the slurry Aluminum solution (concentration: 100g / L) for 120min, then homogenize for 10min; use sodium metaaluminate solution (concentration: 160g / L) to adjust slurry pH=6.5, take 10min, then homogenize for 60min; autoclave (Pressure is 1MPa) Keep at 90°C for 60min; wash with water until the resistivity of the filtrate is >180 ohm; flash steam and steam powder to get the finished product, when steam powder, a...

Embodiment 2

[0046] Add deionized water to the primary product of chlorinated titanium dioxide for slurrying, the concentration of the slurry is 600g / L, add sodium metasilicate, and its total addition amount is TiO 2 0.25% of 0.25%, then sand milling, sand milling to a particle size of 0.320 μm, particle size distribution 180 ohm; flash steaming and steam powder to obtain the finished product, when steam powder, add to the titanium dioxide material Polyol (TMP) in the amount of TiO 2 The 0.1% of total amount, other are with embodiment 1.

Embodiment 3

[0048] Add distilled water to the primary product of chlorinated titanium dioxide to make slurry, the concentration of the slurry is 700g / L, add alkyl sulfonate, and the total addition amount is TiO 2 0.5% of 0.5%, and then sand milled until the particle size is 0.350 μm, and the particle size distribution is 180 ohm; flash steamed and steamed to obtain the finished product. When steaming, add Titanate, the amount is TiO 2 The 0.2% of total amount, other are with embodiment 1.

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Abstract

The invention discloses a preparation method of titanium dioxide for electrophoretic coating of aluminum materials. Aluminum is first deposited on the alkali side and then aluminum is deposited on the acid side to form mixed crystals and better wrap titanium dioxide particles, which not only ensures the integrity of the film layer , and make the titanium dioxide have a higher surface acidity, and have good compatibility with the basic resin for coating, which can make the coating of aluminum material have better corrosion resistance. In addition, even if the present invention does not use acid-base neutralization in the coating process, only certain acidic or alkaline aluminum salts are used for pH adjustment, but there is still a certain amount of salt that is coated during the deposition of alkaline aluminum salts and acidic aluminum salts. Therefore, the present invention adopts high-pressure hydrothermal effect after coating, which can well remove the wrapped salt, improve the resistivity of titanium dioxide, and further reduce the influence of ions on the stability of the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide, and in particular relates to a preparation method of titanium dioxide for electrophoretic coating of aluminum materials. Background technique [0002] The continuous and rapid development of my country's economy and high-tech has promoted the rapid development of my country's aluminum smelting and aluminum processing industries. We understand that aluminum alloys have defects such as low surface hardness and poor wear resistance. In order to expand the scope of application and prolong the service life, surface treatment technology has become an indispensable part of the use of aluminum alloys, and anodic oxidation technology is the most widely used and most successful. Anodizing refers to the process of forming an oxide film on aluminum products (anodes) under the corresponding electrolyte and specific process conditions of aluminum and its alloys under the action of an applied current....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/06C09C3/04C09D5/44C09D5/08C09D7/62
CPCC01P2006/40C01P2006/90C09C1/3692C09C3/006C09C3/04C09C3/063C09D5/08C09D5/448
Inventor 陈建立赵丁侯廉杰王永珊张健宋运萍李瑞瑞曹青喜王欢欢王莉萍
Owner HENAN BILLIONS NEW MATERIAL CO LTD