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Coating compositions comprising diisocyanate chain extended bisaspartates

A technology of aspartate and monoaspartate, applied in polyurea/polyurethane coatings, coatings, devices for coating liquids on surfaces, etc., can solve problems such as increased viscosity of compositions

Active Publication Date: 2016-10-12
AXALTA COATING SYST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for some applications, the pot life of these coating compositions is not well balanced with early hardness development after application, i.e., the viscosity of the composition increases after mixing the individual components and before applying the coating composition to the substrate too fast

Method used

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  • Coating compositions comprising diisocyanate chain extended bisaspartates
  • Coating compositions comprising diisocyanate chain extended bisaspartates
  • Coating compositions comprising diisocyanate chain extended bisaspartates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0138] Measurement methods

[0139] The following measurement methods were used to evaluate the parameters given in the examples and claims.

[0140] Hazen color

[0141] Color values ​​are measured on a BYK LCSIII instrument on the Hagstone scale (based on ASTM D1209).

[0142] Gardner-Holdt (bubble) viscosity

[0143] This method allows rapid determination of the kinematic viscosity of liquids such as resins and varnishes. Certified tubes from BykGardner are used to measure viscosity at room temperature.

[0144] valid period

[0145] The pot life of the composition is measured by determining the viscosity (DIN 4 cup) increase as a function of time. Pot life is defined as the time required for the initial viscosity to increase by a factor of 1.5. Pot life defines the period of time during which the clearcoat composition remains readily sprayable.

[0146] viscosity

[0147] The viscosity of the activated clearcoat is determined according to DIN 53211 with a DI...

Embodiment 5

[0184] Embodiment 5: Preparation of the transparent coating based on Comparative Examples 1, 2, 4A and 4B and Invention Example 3

[0185] A clear coat composition was prepared by using a 60.67% based N3390 (aliphatic polyisocyanate HDI trimer, 90% solids, Bayer), 36.93% n-butyl acetate and epoxy functional silane (2.4% from Momentive Performance Materials A187) polyisocyanate activator for activation. The clearcoat formulation and activator were mixed by hand in such a ratio that the NCO to NH ratio was kept constant at 1.21.

[0186] Clearcoats 5A, 5B, 5C, 5D, and 5E were formulated with the compounds shown in Table 1 below.

[0187] Table 1:

[0188]

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PUM

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Abstract

This invention relates to a coating composition, a method for coating of a metallic substrate as well as the use of a chain-extended aspartate prepolymer for improving the early hardness of the coating composition and in a two-component coating composition.

Description

technical field [0001] The present invention relates to coating compositions, methods for coating metal substrates, and chain-extended aspartate prepolymers for improving the early hardness of said coating compositions and to the use in two-component coating compositions . Background technique [0002] Coating compositions are well known in the art and are used in a wide variety of applications, such as primers, basecoats and clearcoats in vehicle original coatings and vehicle restoration coatings. In this regard, great efforts have been made to develop coating compositions that impart desired properties to the substrate or article to be coated. For example, coatings have been developed for eg protection against abrasion, chemicals, corrosion, thermal or mechanical shocks. Furthermore, in vehicle restoration coatings, there is an increasing market demand for coating compositions that dry quickly at room temperature. [0003] In this regard, aspartate-based coating composi...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/80C09D175/02C08G18/38C09D175/12
CPCC08G18/3821C08G18/755C08G18/792C08G18/8058C09D175/02B05D1/02B05D7/14B05D7/50B05D7/51C08G18/3253C08G18/3259C08G18/3262
Inventor 夏洛特·恩基施-克鲁格卡门·弗洛斯巴赫安·瓦埃斯利恩·坦格约瑟夫·许伊布雷希茨
Owner AXALTA COATING SYST GMBH
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