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Precoated metal sheet and method of production of precoated metal sheet

A manufacturing method and metal plate technology, applied in chemical instruments and methods, metal layered products, devices for coating liquid on the surface, etc., can solve the problem of increased corrosion resistance of pre-coated metal plates and damage to the processing of pre-coated metal plates Sexuality, prone to swelling and other problems, to achieve the effect of inhibiting photoaging, not deteriorating flowering characteristics, and improving efficiency

Active Publication Date: 2007-11-14
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] As described in Japanese Unexamined Patent Publication No. 8-309917, it is known that if the content of the antirust pigment in the coating film is increased, the workability of the precoated metal sheet will be impaired.
In addition, for a general precoated metal sheet with a two-layer structure of the lower layer and the upper layer, when the anti-rust pigment of the lower layer is added, salt water intrudes into the interface of the two layers in the salt spray test (SST), making it easy to swell. It is known that the corrosion resistance of pre-coated metal sheets cannot be increased as expected

Method used

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  • Precoated metal sheet and method of production of precoated metal sheet
  • Precoated metal sheet and method of production of precoated metal sheet
  • Precoated metal sheet and method of production of precoated metal sheet

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0168] The present invention is applied to the production and processing line for precoated steel sheets shown in FIG. 11 when curtain coating a multilayer film on a steel strip.

[0169] For the equipment of FIG. 11 , the strip rolled into a coil is uncoiled on the uncoiler 41 , and the strip passes through the looper tower 42 , the chemical conversion treatment device 47 , the primer 45 , and the induction heating furnace 43 . A slide-type slide hopper type curtain coating device 49 is arranged at the subsequent position, and curtain coating of the multilayer film is performed on the surface of the running strip 11 . Downstream of the curtain coater 49, as equipment for drying and baking the applied paint, an induction heating furnace 51 is provided. Then, the strip passes through the loop tower 53 and is coiled by the coiler 44 as a processed strip.

[0170]In the slide hopper type curtain coater 49, two layers of simultaneous coating were performed. The dimensions of the...

example 2

[0198] In the same manner as Example 1, three layers of simultaneous coating were carried out on the steel strip. Coating, pigment, leveling agent used are the same as those described in Example 1. Table 3 and Table 4 show the experimental results.

[0199] table 3

[0200] No.

end

layer

Layer 1

Layer 2

superficial

Poor power

(layer 1-

Layer 2)

interface

of

Ra

(μ

m)

interface ripple

% (relative

on top film

thick)

paint

Uniform

agent

Surface Tension

viscosity

(Second)

color

(Yan

material)

average

film thickness

( μ

m)

paint

Uniform

flat

agent

Surface Tension

viscosity

(Second)

color

(Yan

material)

average

film thickness

(μ

m)

average

value

(mN /

m)

Wave

move

av...

example 3

[0204] With the amount ratio shown in Table 5, the paint for the lower layer coating film layer and the top layer glossy layer was prepared. Specifically, each of the polyester resins shown in Examples 3A to 3E in Table 5 was dissolved in cyclohexanone / Solbexo (trade name of Exon Chemical Co., Ltd.) 150. Secondly, to these coatings, add melamine resin (methylated melamine (trade name: Cymel 30 3, product of Mitsui Cytec Co., Ltd.)) or isocyanate curing agent (Desumojiyu-lu BL3175, product of Mitsui Cyanamid Co., Ltd.) as required, and according to requirements A catalyst (trade name: Catalyst 6000, product of Mitsui Cytec Co., Ltd.) or TKI (manufactured by Takeda Pharmaceutical Co., Ltd.) was added and stirred to obtain a paint.

[0205] In order to adjust the surface tension, 0.1wt% of a leveling agent BYK141 (product of BYK-Chemie Company) was added to the lower coating, and 0.3wt% of an acrylic leveling agent (product of Japanese Peinto) was added to the upper coating. The...

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Abstract

This invention provides a precoated metal plate that is improved in color shading prevention and adhesion and is produced by simultaneous multilayer coating. In the precoated metal plate, the center line average roughness Ra in the coating film interface is not less than 0.3 mum, and the maximum height from the waviness center line in the interface is not more than 50% of the layer thickness. There are also provided a top clear coated metal plate, which comprises a clear layer as an upper layer, has an interfacial center line average roughness Ra of 0.3 to 0.7 [mu]m and has excellent weathering resistance, a precoated metal plate having excellent processability and corrosion resistance, which contains not less than 30% by mass on average of a rust preventive pigment so that the average rust preventive content of the upper layer is lower than that in the average rust preventive pigment of the lower layer, the concentration gradient is lowered so that the position from around the interface of the upper layer and the lower layer is increased, and the roughness Ra in the interface of the lower layer and the upper layer is 0.3 to 0.7 [mu]m, and a process for producing the same.

Description

technical field [0001] The present invention relates to a precoated metal sheet used in applications such as home appliances, building materials, automobiles, and furniture, and a method for producing the same. More specifically, the present invention relates to the interface between the multilayer coating films produced by simultaneous coating of multiple layers showing a predetermined center line average roughness Ra, while preventing floating (floating). A precoated metal sheet with improved adhesion, a bright finish type precoated metal sheet excellent in weather resistance, a precoated metal sheet having both workability and corrosion resistance, and methods for producing these precoated metal sheets. Background technique [0002] Conventionally, metal sheets are often painted after processing in order to improve antirust performance and aesthetics. For example, in the case of steel sheets, baking coating is often performed after processing. Post-coating after process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/18B05D7/14
CPCB05D2202/15B05D7/5323B05D7/50B05D2701/00B05D7/14Y10T428/12472Y10T428/12993B32B15/18
Inventor 古川博康金井洋稻田贤治飞泽克纪田中重典植田浩平吉田健吾末宗义广
Owner NIPPON STEEL CORP
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