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

Aqueous coating material composition and coating film forming method

A technology of water-based coatings and compositions, which is applied in the direction of polyester coatings, polyurea/polyurethane coatings, coatings, etc., and can solve the problems of not being able to obtain sufficient cracking resistance

Inactive Publication Date: 2018-10-26
นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when the multilayer coating film obtained by this formation method is cured at a temperature of 100° C. or lower, for example, sufficient chipping resistance may not be obtained.

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
  • Aqueous coating material composition and coating film forming method
  • Aqueous coating material composition and coating film forming method
  • Aqueous coating material composition and coating film forming method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0085] In the preparation of the above-mentioned (A) water-based resin, when carrying out emulsion polymerization in an aqueous medium, for example, in water or an aqueous medium containing an organic solvent such as alcohol as needed, the emulsifier is dissolved, and the emulsifier is dripped under heating and stirring. Addition of a substance mixed with an α,β-ethylenically unsaturated monomer and a polymerization initiator used as raw materials is carried out thereby. The α,β-ethylenically unsaturated monomer-mixed substance used as a raw material can be emulsified in advance using an emulsifier and water.

[0086] As a polymerization initiator that can be suitably used for emulsion polymerization, azo-based oily compounds (such as azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile) and 2, 2'-azobis(2,4-dimethylvaleronitrile), etc.), and aqueous compounds (such as anionic 4,4'-azobis(4-cyanovaleric acid), 2,2- Azobis (N-(2-carboxyethyl)-2-methylpropionamidine and ca...

manufacture example 1

[0265] Production Example 1 Production of acrylic emulsion having hydroxyl and carboxyl groups

[0266] 1,000 parts of deionized water was poured into a reaction container equipped with a stirrer, a nitrogen introduction pipe, a temperature control device, a condenser, and a dropping funnel, and the temperature was raised to 80° C. while stirring under a nitrogen atmosphere.

[0267] 103 parts of styrene, 290 parts of n-butyl methacrylate, 280 parts of n-butyl acrylate, 302 parts of hydroxyethyl acrylate, 26 parts of acrylic acid, 3 parts of dodecyl mercaptan and Latemur PD-104 as an emulsifier (manufactured by Kao Corporation, 20% aqueous solution) was added to 1,000 parts of deionized water and emulsified to obtain a pre-emulsion, and the resulting pre-emulsion was mixed with an aqueous initiator solution obtained by dissolving 3 parts of ammonium persulfate in 300 parts of deionized water Add dropwise over 2 hours together.

[0268] After completion of the dropwise addit...

manufacture example 2

[0269] Production Example 2 Production of acrylic emulsion having hydroxyl and carboxyl groups

[0270] The amount of monomers in the monomer mixture of Production Example 1 was changed to 90 parts of styrene, 249 parts of n-butyl acrylate, 403 parts of n-butyl methacrylate, 232 parts of hydroxyethyl acrylate, 26 parts of acrylic acid, ten parts Except for 3 parts of dialkyl mercaptan, after polymerization in the same manner, 8.2 parts of N,N-dimethylaminoethanol was added to obtain an acrylic emulsion having a resin solid content of 30% by mass. The acrylic emulsion calculated from the monomer composition had a hydroxyl value of 100 mgKOH / g and an acid value of 20 mgKOH / g in terms of resin solid content. In addition, the number average molecular weight measured by GPC after water removal of the acrylic resin in the obtained acrylic emulsion was 43,000.

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
hydroxyl valueaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
elongationaaaaaaaaaa
Login to View More

Abstract

The objective of the present invention is to provide an aqueous coating material composition which has excellent curability at low temperatures. The present invention provides an aqueous coating material composition which contains (A) an aqueous resin having a hydroxyl group and a carboxyl group, (B) a water-dispersible blocked polyisocyanate compound, (C) a hydrophilization modified carbodiimidecompound and (D) an aqueous polyurethane resin. The aqueous resin (A) having a hydroxyl group and a carboxyl group has a hydroxyl number of 80-200 mgKOH / g and an acid value of 10-40 mgKOH / g in terms of resin solid content; the aqueous polyurethane resin (D) has a glass transition point (Tg) of -50 DEG C or less; and a cured film of the aqueous polyurethane resin (D) has an elongation at break of 400% or more at -20 DEG C.

Description

technical field [0001] The present invention relates to an aqueous coating composition and a coating film forming method using the aqueous coating composition. Background technique [0002] Multiple coating films with various functions are sequentially formed on the surface of the object to be coated, such as an automobile body, so as to protect the object to be coated while imparting a beautiful appearance and excellent design. As a method of forming such a plurality of coating films, generally, an undercoat coating film such as an electrophoretic coating film is formed on an object to be coated with excellent conductivity, and an intermediate coating film and a top coating film are sequentially formed thereon if necessary. Method of coating film. [0003] In recent years, due to energy saving and reduction of CO 2 The need to reduce environmental burdens such as emissions requires reducing the heating and curing step in coating film formation as much as possible. Howeve...

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): C09D175/04B05D7/24C09D5/00C09D5/02C09D7/63C09D133/02C09D133/14
CPCC09D5/02C09D133/02C09D133/14C09D175/04C08K5/29C09D7/63C09D7/65B05D3/102B05D7/14B05D7/532B05D2401/20B05D2502/005B05D2503/00B05D2505/50B05D7/542B05D2202/10B05D2203/00C08G18/80C09D133/08C09D167/02
Inventor 西冈美穗清水诚
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