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    • 6. 发明申请
    • COATING METHOD AND HARDENER FOR POLYURETHANE PAINT
    • 聚氨酯涂料的涂料方法和硬化剂
    • WO2014009221A1
    • 2014-01-16
    • PCT/EP2013/064032
    • 2013-07-03
    • BAYER MATERIALSCIENCE AG
    • SHIGEMORI, TomokazuMORITA, Hiroshi
    • B05D7/00C08G18/79
    • B05D7/532B05D7/53C08G18/02C08G18/022C08G18/6229C08G18/6254C08G18/73C08G18/7818C08G18/7831C08G18/7837C08G18/79C08G18/791C08G18/792C08G18/80C08G18/8061C09D175/04C09D175/06Y10T428/31551Y10T428/31554
    • [Problem] To increase adhesive strength between an aqueous base coat layer and a clear coat layer in a coating method by a two-coat one-bake system where an aqueous base coat paint is coated, then a clear coat paint is coated, and these two coated films are simultaneously hardened, in comparison with the conventional method. [Solution] Provided is a coating method using a specific hardener in a clear coat paint. Namely, the hardener is characterized in that (1) it includes a reaction product of (i) a derivative of 1,6-hexamethylene diisocyanate including a trimer and virtually not including a diisocyanate monomer, and (ii) a compound having both an active hydrogen and a hydrophilic group; and (2) viscosity at 23°C is not more than 1,000 mPa⋅s. The compound having both an active hydrogen and a hydrophilic group herein is a compound having an active hydrogen-containing group and a sulfo group represented by formula (I), and preferably the sulfo group in a hardener is neutralized with a tertiary amine. Formula (I) X-R-SO 3 H (in the formula, X is an amino group, alkylamino group, cycloalkylamino group, or hydroxyl group, R is an aliphatic and/or alicyclic hydrocarbon group).
    • [问题]通过涂布方法中的水性底涂层和透明涂层之间的粘合强度,通过涂布水性底涂料的双层单烘烤系统,涂布透明的涂料涂料, 与常规方法相比,两个涂膜同时硬化。 [解决方案]提供了在透明涂料涂料中使用特定固化剂的涂布方法。 即,该固化剂的特征在于,(1)包含(i)1,6-六亚甲基二异氰酸酯的衍生物的反应产物,其包含三聚物,实际上不包含二异氰酸酯单体,和(ii)具有活性 氢和亲水基团; 和(2)在23℃下的粘度不大于1,000mPass。 具有活性氢和亲水基团的化合物是具有活性含氢基团和由式(I)表示的磺基的化合物,优选用叔胺中和固化剂中的磺基。 式(I)X-R-SO 3 H(式中,X为氨基,烷基氨基,环烷基氨基或羟基,R为脂族和/或脂环族烃基)。