Method of forming multilayered coating film, multilayered coating film, and coated article

A multi-layer coating film and coating layer technology, which is applied in the direction of surface coating liquid devices, coatings, starch coatings, etc., to achieve the effects of less emissions, less environmental load, and excellent alkali resistance and solvent resistance

Inactive Publication Date: 2010-11-24
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, with respect to these starch-based paints, a method for forming a multilayer coating film and a multilayer coating film excellent in finishing properties, pencil hardness, scratch resistance, adhesion, alkali resistance, and solvent resistance are still unknown.

Method used

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  • Method of forming multilayered coating film, multilayered coating film, and coated article
  • Method of forming multilayered coating film, multilayered coating film, and coated article
  • Method of forming multilayered coating film, multilayered coating film, and coated article

Examples

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Embodiment

[0165] Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In addition, unless otherwise specified, "part" and "%" are "parts by mass" and "% by mass".

[0166] [Example concerning multilayer coating film having a coating film layer formed of photocurable paint (A)]

manufacture example A-1

[0167] [Production example A-1] Production example of modified starch No.A-1 (corresponding to modified starch (a10))

[0168] Suspend 25 parts of high amylose corn starch (hydroxyl value 500 mgKOH / g) in 200 parts of dimethyl sulfoxide (DMSO), heat up to 90°C while stirring, and keep at this temperature for 20 minutes to make it gelatinized. To this solution, 20 parts of sodium bicarbonate was added as a catalyst, 90 degreeC was maintained, 17 parts of vinyl laurates were added, and it was made to react at this temperature for 1 hour. Then, 37 parts of vinyl acetate were added, and it was made to react also at 80 degreeC for 1 hour. Thereafter, the reaction solution was poured into tap water, stirred at a high speed, pulverized, filtered, and dehydrated to obtain modified starch No.A-1.

manufacture example A-2

[0169] [Production example A-2] Production example of polyurethane resin solution No.A-1 (corresponding to product (I))

[0170] 125 parts of toluene and 377 parts of isophorone diisocyanate (equivalent to polyisocyanate compounds) were placed in a 1 L reaction vessel equipped with a thermometer, a thermostat, a stirrer, a cooling pipe, and a dropping device, and the reaction was carried out under a nitrogen atmosphere. Stir to mix and heat up to 80°C.

[0171] Next, 123 parts of 1,4-butanediol (equivalent to polyhydric alcohol) was added dropwise over 3 hours, and after the dropwise addition was completed, it was aged at 80°C for 30 minutes to prepare a polyurethane resin solution No. A-1. In addition, the NCO value of the resin solid content of polyurethane resin solution No. A-1 was 55 mgNCO / g.

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Abstract

A method of forming a multilayered coating film which comprises: a step in which a starch-based colored base coating material containing a starch-based resin is applied to a work to be coated to form a coating film; a step in which a photocurable coating material (B) comprising a photocurable compound and/or photocurable resin (b1), a photopolymerization initiator (b2), and a starch-based resin (b3) is applied to that coating film to form a coating film; and a step in which the coating film of the photocurable coating material (B) is irradiated with light to cure this coating film. As the photocurable coating material (A) or (B) is used a coating material based on a starch derived from a vegetable. This method can form a multilayered coating film excellent in finish, pencil hardness, marring resistance, adhesion, alkali resistance, and solvent resistance.

Description

technical field [0001] The present invention relates to a method for forming a multilayer coating film by forming a coating film using a starch-based coloring primer of plant-derived starch, and forming a photocurable coating material containing a specific starch-based resin on the coating film Apply the film and allow it to light cure. The present invention also relates to a multilayer coating film and a coated article containing the multilayer coating film. Background technique [0002] In recent years, from the viewpoint of reducing the impact on global warming, it is required to reduce CO 2 Emissions require active use of renewable resources that do not increase CO in the carbon dioxide cycle on Earth 2 of emissions from plant-based raw materials. [0003] As such typical materials derived from natural products, modified starches such as polysaccharide starch and acetylated starch are currently used in industries related to the food industry and the paper industry. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24B05D1/36C08F251/00C08G81/00C08J7/04C09D4/00C09D7/12C09D103/02C09D103/04C09D151/02C09D175/04
CPCC09D4/06B05D5/00C09D175/16C08F251/00B05D7/52C09D103/02C09D151/02B05D3/06C08G18/6484C08L2666/02
Inventor 稻田祐一增田秀树
Owner KANSAI PAINT CO LTD
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