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

Preparation method for cathode electrophoretic paint with excellent shrinkage resistance

A cathodic electrophoretic coating, shrinkage crater performance technology, applied in electrophoretic coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve the problems of large difference in surface tension, poor leveling, etc. Good performance, the effect of preventing shrinkage

Inactive Publication Date: 2018-08-14
ANHUI LINGYANG NEW MATERIAL CO LTD
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is baked and cured, the water evaporates completely, and the surface tension of the acrylate resin and the modified epoxy resin is quite different, forming an obvious tension gradient. Formation of shrinkage cavities or poor leveling

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of crosslinking agent:

[0023] a. In N 2 Under protection, condensing reflux and mechanical stirring, put 18ml of isophorone diisocyanate and 22ml of butanone in a four-neck flask, slowly raise the temperature to 70°C, dissolve 1.8g of triethanolamine in an appropriate amount of butanone, and Add it dropwise to the reaction system within 20 minutes using the dropping funnel, and react at a constant temperature for 60 minutes;

[0024] b. Weigh 16ml of hydrophilic chain extender N-methyldiethanolamine, dissolve it with an appropriate amount of solvent butanone, transfer it to the dropping funnel, add it dropwise to the above reaction system within 10 minutes, and continue the heat preservation reaction for 60 minutes , preparing a branched isocyanate group (-NCO) terminated prepolymer;

[0025] c. According to the molar ratio of active H in the blocking agent to -NCO in the prepolymer is 1:1.2, add an appropriate amount of blocking agent dimethylpyrazo...

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
quality scoreaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method for cathode electrophoretic paint with excellent shrinkage resistance. The preparation method comprises the following steps: taking N-methyldiethanolamine,PEG-600 or polyether glycol as a hydrophilic chain extender, leading structures such as an amino group and polyether into an isocyanate group end-capped prepolymer molecule, and reacting one part ofprepolymer with a sealing agent, thereby obtaining a cationic waterborne sealed type polyisocyanate cross-linking agent with completely sealed -NCO group, taking the other part of prepolymer as a modifier to precipitate in grafting reaction of epoxy resin, thereby remarkably reducing difference between surface tension of the cross-linking agent and surface tension of the modified epoxy resin, andeffectively restraining appearance of electrophoretic shrinkage; besides, the prepared sealed type polyisocyanate cross-linking agent can realize low-temperature un-sealing, can quickly realize un-sealing at a curing initial stage of a electrophoretic paint film, and quickly improves molecular weight of the paint film resin, so that a flowing state of the paint film is regulated, and occurrence ofshrinkage is prevented.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and in particular relates to a preparation method of cathodic electrophoretic coating with excellent anti-shrinkage performance. Background technique [0002] As a water-based coating, electrophoretic coating has the advantages of uniform coating film, small paint loss, non-toxicity, low VOC, high automation, etc. It is widely used in the surface protection of metal coatings such as automobiles and hardware. It is divided into two types: anode and cathode. Types of. [0003] In electrophoretic coating, shrinkage cavity of paint film occurs from time to time, but there are many factors causing shrinkage cavity, which are mainly divided into two factors: process control and formula design. Process control factors include: (1) Shrinkage due to poor degreasing in the pre-treatment; (2) Contamination of the electrophoretic paint film before curing; (3) Bath parameter control is not within...

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): C09D163/00C09D175/04C09D5/44C08G18/32C08G18/48
CPCC08G18/3275C08G18/4825C08G18/4833C09D5/4442C09D5/4453C09D5/4465C09D5/4496C09D163/00C09D175/04C08L75/04C08L63/00
Inventor 刘玉胡强陈小琴
Owner ANHUI LINGYANG NEW MATERIAL CO LTD
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