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Polyurethane coating composition

A technology of polyurethane coating and composition, applied in the field of polyurethane coating composition, can solve the problems of usability limitation, small recoating window, etc.

Active Publication Date: 2022-07-12
SWIMC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyurethane topcoats typically have a small recoat window due to the tendency of topcoats to react with ambient moisture, and therefore, the usefulness of polyurethane compositions as tie coats may be limited

Method used

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  • Polyurethane coating composition
  • Polyurethane coating composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0066] The invention is illustrated by the following examples. It is to be understood that specific examples, materials, amounts and procedures are to be interpreted broadly in accordance with the scope and spirit of the invention as set forth herein. All parts and percentages are by weight and all molecular weights are weight average molecular weights unless otherwise stated. Unless otherwise stated, all chemicals used were commercially available, eg, from Sigma-Aldrich, St. Louis, MO.

[0067] testing method

[0068] Unless otherwise indicated, the following test methods were used in the following examples.

[0069] Laboratory Cyclic Corrosion Testing

[0070] Cyclic corrosion was examined using standard methods (ie, Society of Automotive Engineers (SAE) Surface Vehicle Standard J2334 Exterior Surface Corrosion Laboratory Test). The test is cyclic in nature, ie exposing the test sample to a climate that changes over time. As used herein, test samples were subjected to ...

example 1

[0081]Example 1. Preparation of Urethane Tie Coating Composition #1

[0082] Two-component urethane coating compositions were prepared according to the following method. By combining 91.30 g of CAPA 3050 polyester polyol (Perstorp), 73.04 g of methyl amyl ketone, 16.74 g of butyl acetate, 804.86 g of tert-butyl acetate and 11.22 g of 2,4-pentanedione, to prepare component A. To this mixture were added 0.32 g DUROCT cobalt 12% NX (Dura Chemicals, Emeryville CA) and 0.170 g dibutyltin dilaurate as catalysts, and 0.46 g COROC A-620-A2 (Arkema) as flow control agent, and 1.89 g TINUVIN 292 (BASF).

[0083] Part B was prepared by combining 321.40 g of TOLONATE HDT 90 polyisocyanate (Vencorex) and 83.40 g of butyl acetate.

[0084] Components A and B are then combined to produce a two-component tie coating composition. The composition had 27.28 wt% non-volatile material, 374 g / L VOC and a 16s viscosity as measured with a ZAHN Signature #2 series dip cup (Gardner).

example 2

[0085] Example 2. Preparation of Urethane Tie Coating Composition #2

[0086] Two-component urethane coating compositions were prepared according to the following method. By combining 126.7 g of CAPA 4101 polyester polyol (Perstorp), 73.04 g of methyl amyl ketone, 16.74 g of butyl acetate, 769.40 g of tert-butyl acetate and 11.22 g of 2,4-pentanedione, to prepare component A. To this mixture were added 0.32 g DUROCT cobalt 12% NX (Dura Chemicals, Emeryville CA) and 0.17 g dibutyltin dilaurate as catalyst, and 0.46 g COROC A-620-A2 (Arkema) as flow control agent, and 1.89 g TINUVIN 292(BASF)

[0087] Part B was prepared by combining 321.40 g of TOLONATE HDT 90 polyisocyanate (Vencorex) and 83.40 g of butyl acetate.

[0088] Components A and B are then combined to produce a two-component tie coating composition. The composition had 29.68 wt% non-volatile materials and 356 g / L VOC.

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Abstract

This application describes a two-component polyurethane coating composition. The composition includes a polyfunctional isocyanate component and a polyfunctional polyol component. The polyurethanes described herein are high index compositions that can be used as tie coats in conventional overcoating or repair processes. The described compositions provide improved adhesion between aged and freshly applied coatings.

Description

Background technique [0001] Multilayer coatings are commonly applied to metal substrates in a variety of industries including, for example, the automotive and aerospace industries. These coatings are applied to retard or inhibit corrosion, and multilayer polyurethane coatings are particularly useful because these coatings are economical and relatively easy to apply. The coating dries quickly and has good impact resistance, which makes this type of coating especially useful for coating metal components, such as those for long-distance transportation or shipping. [0002] When multiple coatings are used, the integrity of the coatings and their ability to resist corrosion is compromised when adjacent coatings exhibit poor adhesion. This is especially true when repairing or recoating multiple coats. In these cases, a new coating (eg, a topcoat) is applied directly over the entire aged coating. However, some coatings exhibit poor adhesion when applied over the entire aged coatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/40C08G18/42C08G18/68C09D175/04
CPCC08G18/792C08G18/246C09D175/06C08G18/4277C08G18/222B05D7/14B05D7/58B05D2420/01B05D2420/02B05D2420/03B05D2503/00C08G18/10C08G18/73C08G18/755C08G18/7621C08G18/7657
Inventor 加里·埃德金顿杰森·林德奎斯特塔潘·德布罗伊
Owner SWIMC LLC
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