Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for forming multilayer coating film

A multi-layer coating film and coating film technology, which is applied to the surface coating liquid device, coating, electrolytic coating, etc., can solve the problems of mutual interference of coating film layers, deterioration of multi-layer coating film appearance, etc., to prevent flow Hanging, the effect of excellent coating appearance

Inactive Publication Date: 2018-10-23
นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี +1
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that when multiple coating compositions are repeatedly applied, if the base layer is not completely formed and smoothed in advance, the adjacent coating layers will interfere with each other, and the unevenness of the base layer will be reflected on the upper layer. Deterioration of the appearance of the coating film

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for forming multilayer coating film
  • Method for forming multilayer coating film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0253] Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these Examples. In addition, in an Example, "part" means "part by mass" unless otherwise indicated.

[0254] Water-based intermediate coating composition

manufacture example 1～5

[0255] Production examples 1-5: Preparation of hydroxyl-containing acrylic resin emulsion

[0256] 445 parts of water and 5 parts of NEWCOL 293 (manufactured by Nippon Emulsifier Co., Ltd.) were charged into a reaction vessel for the production of a common acrylic resin emulsion equipped with a stirrer, a thermometer, a dropping funnel, a reflux condenser, and a nitrogen introduction pipe. While stirring, the temperature was raised to 75°C. A mixture of 24.6 parts of the monomer mixture shown in Table 1, 240 parts of water, and 30 parts of NEWCOL 293 (manufactured by Nippon Emulsifier Co., Ltd.) was emulsified using a homogenizer, and the monomer pre-emulsion was stirred for 3 hours. Add dropwise to the above reaction vessel. Simultaneously with the dropping of the monomer pre-emulsion, an aqueous solution in which 1 part of APS (ammonium persulfate) as a polymerization initiator was dissolved in 50 parts of water was evenly added dropwise to the above-mentioned reaction ve...

manufacture example 6

[0266] Manufacturing example 6: Preparation of hydroxyl-containing polyester resin

[0267] Add 25.6 parts of isophthalic acid, 22.8 parts of phthalic anhydride, 5.6 parts of adipic acid, 19.3 parts of trimethylolpropane, 26.7 parts of neopentyl glycol, 17.5 parts of ε-caprolactone, 2 0.1 part of butyltin oxide was mixed and stirred while raising the temperature to 170°C. Thereafter, the temperature was raised to 220° C. over 3 hours until the acid value became 8 mgKOH / g while removing water produced by the condensation reaction. Next, 7.9 parts of trimellitic anhydride was added, and it was made to react at 150 degreeC for 1 hour, and the polyester resin whose acid value was 40 mgKOH / g was obtained. Furthermore, after cooling to 100°C, 11.2 parts of butyl cellosolve were added and stirred until uniform, and after cooling to 60°C, 98.8 parts of ion-exchanged water and 5.9 parts of dimethylethanolamine were added to obtain a solid content of 50% by mass and a solid content o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
glass transition temperatureaaaaaaaaaa
acid valueaaaaaaaaaa
hydroxyl valueaaaaaaaaaa
Login to View More

Abstract

The objective of the invention is to keep the softness of a coating film in a film making process and obtain a smooth coating film even if on a base material with thermal expansion / contractibility. The invention provides a method for forming a multilayer coating film, which is a method for form a multilayer coating film on an automobile vehicle body. The method comprises following steps of coatingwaterborne intermediate coating compositions, preheating coated intermediate coating compositions under 60-90 DEG C for 3-10 minutes so as to form un-solidified intermediate coating films, forming preheated un-solidified substrate coating films and un-solidified transparent coating films and baking and solidifying the un-solidified coating films so as to form a multilayer coating film. The intermediate coating compositions comprise coating film forming resin. The coating film forming resin comprises (a) acrylic resin emulsion with regulated physical property, and film making auxiliaries including fatty acid diester compounds with the boiling point from 280 DEG to 350 DEG C in the waterborne intermediate coating compositions. Mixing and film making are performed on the (a) and the (b) so that the elongation at break of a solidification film is 1% or over is obtained, wherein mass ratio of the solid components of the (a) to the (b) is 3 : 1.

Description

technical field [0001] The invention relates to a method for forming a multilayer coating film, in particular to a method for forming a multilayer coating film composed of an intermediate coating film, a base coating film and a clear coating film on an automobile body, the method comprising A specific intermediate coating composition is applied to the car body and preheated to form an uncured intermediate coating film; the water-based base coating composition is applied to the uncured intermediate coating film and preheated to form Uncured basecoat film. Background technique [0002] For example, the formation of a multilayer coating film on an object to be coated such as an automobile body is basically carried out by sequentially forming an intermediate coating film, a base coating film, and a clear coating film on a steel plate as the object to be coated. Conventionally, these coating films are formed by applying coating compositions whose compositions are adjusted accord...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D7/24B05D7/00C09D7/65C09D133/08
CPCB05D7/14B05D7/24B05D7/572B05D2502/00C08L2205/035C09D133/08C09D7/65C08L67/02C08L75/04C08L69/00B05D2420/01B05D7/574C09D5/022C09D133/066C25D13/12C25D13/14B05D3/002B05D3/007B05D3/0254C09D133/10
Inventor 川端贵之山崎明长谷真子安保启司成田义则
Owner นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com