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A cathodic electrophoretic coating for improving the yellowing of automobile sealant and its preparation method and application

A technology of raw material and epoxy resin, which is applied in the synthesis of dispersion emulsion for cathodic electrophoretic coatings, can solve the problems of sealant yellowing, etc., and achieve the effects of reduced yellowing, reduced influence of yellowing reactivity, and good coating workability

Active Publication Date: 2021-12-28
美高微球(南通)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of cathodic electrophoretic paint and its preparation method for improving the yellowing of automobile sealant in order to overcome the defect in the technical existence of sealant yellowing phenomenon on the above-mentioned existing automobile cathode electrophoretic coating line

Method used

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  • A cathodic electrophoretic coating for improving the yellowing of automobile sealant and its preparation method and application
  • A cathodic electrophoretic coating for improving the yellowing of automobile sealant and its preparation method and application
  • A cathodic electrophoretic coating for improving the yellowing of automobile sealant and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0127] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention with this.

[0128] Under the situation that the purpose of the present invention is clarified and explained by the following examples, the components of the composition are all explained in parts by weight as a general standard. Unless otherwise specified, for the sake of brevity, "parts" in the embodiments of the present invention have the same meaning as parts by weight.

[0129] Example 1

[0130] 1. Preparation of semi-blocked isocyanate (HBI), the formula is shown in the following table:

[0131] 1. The formula is shown in the table below:

[0132] Chinese name Feed weight:g Isophorone dii...

Embodiment 2

[0267] Same as Example 1, the difference is:

[0268] In the preparation of semi-blocked isocyanate (HBI):

[0269] The 2-ethylhexanol added to the blocking agent is changed to one or two of trimethylolpropane, methyl ethyl ketone oxime (MEKO), caprolactam, and ethylene glycol butyl ether, as long as the total equivalent ratio is 1:1;

[0270] The result is similar to Example 1.

Embodiment 3

[0272] Same as Example 1, the difference is:

[0273] In the preparation of semi-blocked isocyanate (HBI):

[0274] The polyisocyanate can be changed to aromatic, aliphatic, alicyclic diisocyanate or mixture thereof, such as TDI, P-MDI, IPDI, HDI and their polymers, as long as the equivalent ratio remains unchanged. ;

[0275] The result is similar to Example 1.

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Abstract

The invention discloses a cathodic electrophoretic coating for improving the yellowing of automobile sealant, a preparation method and application thereof. On the basis of oxazolidinization reaction of polyisocyanate and epoxy main chain, tertiary amine grafting is introduced at the same time. The quaternary ammonium salt 4N structure of the epoxy end group or the mixed structure of the primary amine salt 1N structure of the amidation reaction of ketimine and epoxy resin and the thio salt 3S structure of the thio compound grafted epoxy end group, through 3S+ The mixed component of 4N type or 3S+1N type is used as the main dispersion emulsion of the cathodic electrophoresis colorant, which ensures the dispersibility and storage stability of the cathodic electrophoresis paint colorant, and the amino groups in the cathodic electrophoresis paint are greatly reduced. It greatly reduces the amine substances released in the electrophoretic coating film when the car is baked at high temperature, and greatly reduces the impact on the yellowing reactivity of the plasticizer in the car sealant, which prevents the car from returning to the factory due to the yellowing of the sealant over time. A repair situation for back-to-line rework occurs.

Description

technical field [0001] The invention belongs to the technical field of synthesis of dispersion emulsions for cathodic electrophoretic coatings, and relates to the synthesis, preparation method and coating application of a modified epoxy resin emulsion having a quaternary ammonium salt structure or a primary amine salt structure and a thio salt structure at the same time technology. Background technique [0002] Cathodic electrophoretic coatings are generally composed of two packages consisting of main emulsion and dispersed color paste. Considering the stability, the two are put into the bath solution in proportion on the coating line for use. The type of hydrophilic group on the end group of the pigment-dispersed water-based resin has a great influence on the dispersibility, electrophoresis and corrosion resistance of the pigment. The emulsion is also based on the basic polymer resin with amine groups, so the water-based color paste dispersion resin should not only conside...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/14C09D163/00C09D5/44C09D17/00
CPCC09D17/001C09D17/005C09D17/008C09D163/00C08G59/1438C08G59/1477C08G59/1483C08G59/1494C09D5/4473C08L2205/035C08L2205/025C08L63/00
Inventor 王磊杨海涛
Owner 美高微球(南通)科技有限公司
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