A kind of preparation method of chrome-free silane film before aluminum coil coating

A technology of chrome silane and aluminum coil, applied in the field of preparation of chrome-free silane film, can solve problems such as containing chromium, and achieve the effects of low use concentration, low environmental pollution and reliable treatment quality

Active Publication Date: 2021-05-14
ZHEJIANG WUYUAN TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, there are the following technical problems: the chromium passivation treatment itself contains chromium, and a large amount of overflow water is required to rinse the aluminum parts after the treatment

Method used

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  • A kind of preparation method of chrome-free silane film before aluminum coil coating
  • A kind of preparation method of chrome-free silane film before aluminum coil coating
  • A kind of preparation method of chrome-free silane film before aluminum coil coating

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Embodiment Construction

[0034] In order to make the purpose of the present invention, technical solutions and advantages clearer, the present invention will be further described below in conjunction with Embodiment 1~6:

[0035] 1) Cleaning: Dip the aluminum coil in acid / alkaline cleaning solution at room temperature for 30-60 seconds.

[0036] 2) Water rinsing: immerse the workpiece cleaned in step 1) in water, wherein the water should keep overflowing, the pH=5-9, the temperature is normal temperature, and the time is 30-60 seconds.

[0037] 3) Deionized water washing: wash the workpiece treated in step 2) with deionized water, wherein the conductivity of the dripping water is <20 us / cm, the temperature is normal temperature, and the time is 10 seconds.

[0038] 4) Direct spray pure water washing: 10 seconds, normal temperature.

[0039] 5) Silane treatment: the silane treatment solution includes the following components by mass:

[0040] 2-20 parts of silane coupling agent,

[0041] 0-2 parts o...

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Abstract

The invention discloses a method for preparing a chrome-free silane film before coating an aluminum coil. Including the following steps: including the following steps: 1) cleaning; 2) water rinsing: 3) deionized water washing; 4) direct injection pure water washing: time 10 seconds, temperature at normal temperature; 5) silane treatment: by roller coating, spraying or soaking 6) drying: 80 ~ 120 ℃, hot air drying. Compared with the prior art, the preparation method of the chrome-free silane film of the aluminum coil before coating has the following beneficial effects: not only the conversion film has good corrosion resistance, but also further reduces the treatment of waste water, chromium-free, Environment friendly.

Description

technical field [0001] The invention relates to a preparation method of a chromium-free silane film, in particular to a preparation method of a chromium-free silane film before coating an aluminum coil. Background technique [0002] Coil coating in aluminum coil coating is mainly based on roller coating. The specific production process of the aluminum coil color coating is as follows: a precision coating machine uniformly coats the same thickness of paint on the surface of the pretreated aluminum coil, enters the oven with an exhaust device at a uniform speed, and then uses infrared rays or hot air to The cyclic baking process is used for curing, and at a specific temperature, it is cross-linked to form a film, and finally a complete coating film with a certain thickness is obtained. [0003] The metal coil color coating process has a history of nearly 100 years. The domestic color coating process officially started in the 1980s. With the development of China's economy, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/68C23C22/56C23C22/34
CPCC23C22/34C23C22/56C23C22/68C23C2222/20
Inventor 李翀施翔李颖
Owner ZHEJIANG WUYUAN TECH CO LTD
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