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Water-based intercoating composition and method of forming multilayered coating film

An intermediate coating and composition technology, which is applied in the field of water-based intermediate coating composition and the formation of multi-layer coating films, can solve the problems of strong cleaning performance and good crack resistance, and achieves beautiful appearance and crack resistance after finishing Good performance, improve the effect of crack resistance

Inactive Publication Date: 2007-02-21
NIPPON PAINT GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the technologies described in the above-mentioned documents cannot simultaneously achieve the goals of a water-based intermediate coating with strong cleaning performance against spray guns, etc., good crack resistance when forming a multilayer coating film, and a beautiful coating appearance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0162] Production Example 1: Production of Water Dispersible Polyurethane Composition A-1

[0163] 0.26 molar parts of polycarbonate diol obtained from 1,6-hexanediol with a molecular weight of 2000, 1.0 molar parts of isophorone diisocyanate, 0.36 molar parts of dimethylol propionic acid, and 39 parts by weight of the total mass of the above substances % N-methyl-2-pyrrolidone was added to the reaction flask, and reacted at 125° C. for 2 hours under nitrogen flow, then 0.47 mole parts of triethylamine was added, and stirred for another hour to obtain a prepolymer. 100 g of the prepolymer obtained above was added dropwise to 120 g of water in which 0.05 g of a silicone-based antifoaming agent SE-21 (trade name, manufactured by Wacker Silicone) was dissolved over 15 minutes. Then, 2.4 g of monoethanolamine was added, measured by IR until the absorption due to isocyanate groups disappeared, and stirred at 40°C to obtain a water-dispersed polyurethane composition (A) No. 1 with a s...

manufacture example 2

[0165] Production Example 2: Production of Water Dispersible Polyurethane Composition A-2

[0166] 0.26 mole parts of polycarbonate diol obtained from 1,6-hexanediol with a molecular weight of 2000, 1.0 mole parts of dicyclohexylmethane-4,4'-diisocyanate, 0.36 mole parts of dimethylol propionic acid, the above-mentioned substances 40 mass % of the total mass of N-methyl-2-pyrrolidone was added to the reaction flask, and reacted at 125° C. for 2 hours under nitrogen flow to obtain a prepolymer. The prepolymer obtained above was added dropwise to 600 g of water in which 0.25 g of the above-mentioned silicone-based antifoaming agent SE-21, 22.0 g of triethylamine, 0.315 g of ethylenediamine, and 5.35 g of monoethanolamine were dissolved in 15 minutes. 500g. Furthermore, it measured by IR until the absorption originating in an isocyanate group disappeared, and it stirred at 40 degreeC for 30 minutes, and obtained the water dispersion type polyurethane composition (A) No. 2 of 32....

manufacture example 3

[0167] Production Example 3: Production of Water Dispersible Polyurethane Composition A-3

[0168] 0.26 mole parts of polycarbonate diol obtained from 1,6-hexanediol with a molecular weight of 2000, 1.0 mole parts of dicyclohexylmethane-4,4'-diisocyanate, 0.36 mole parts of dimethylol propionic acid, the above-mentioned substances 39 mass % of the total mass of N-methyl-2-pyrrolidone was added to the reaction flask, and reacted at 125° C. for 2 hours under nitrogen flow to obtain a prepolymer. The prepolymer obtained above was added dropwise to 120 g of water in which 0.05 g of the above-mentioned silicone-based antifoaming agent SE-21, 3.94 g of triethylamine, 0.31 g of ethylenediamine, and 1.78 g of monoethanolamine were dissolved in 15 minutes. 100g. Furthermore, it measured by IR until the absorption originating in an isocyanate group disappeared, and it stirred at 40 degreeC for 30 minutes, and obtained the water dispersion type polyurethane composition (A) No. 3 of 31.6...

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Abstract

A water-based intercoating composition which comprises an aqueous dispersion type polyurethane composition obtained from a polyisocyanate ingredient comprising a diisocyanate as an essential component, a polyol ingredient comprising a polycarbonate diol having an average molecular weight of 500 to 5,000 and a carboxylated diol as essential components, an amine ingredient comprising a monoamine compound as an essential component, a carboxy-neutralizing ingredient, and water. A coating film made up of three layers is formed respectively from the water-based intercoating composition, a water-based base coating composition, and a clear coating composition by the wet-on-wet technique on an object to be coated which has an electrodeposited coating film formed thereon. The three layers are simultaneously baked and cured to form a multilayered coating film.

Description

technical field [0001] The invention relates to a water-based intermediate coating composition and a method for forming a multilayer coating film. Background technique [0002] In recent years, due to the consideration of the earth's environmental problems and saving resources, some or all of the organic solvents used in the coatings are replaced by water to adapt to the environment. Water-based coatings are widely used in industrial coatings such as automotive coatings, construction, Building materials coatings and other fields. [0003] For example, in automotive coatings, especially intermediate coatings, especially the three-wet method (Three Wet, a three-layer coating formed by Wet-on-wet) technology that has recently been placed on high expectations due to its special energy saving. The coating method of one-time baking of the film. It is also expressed as three coatings and one drying——3C1B) When the intermediate coating paint uses the existing water-based paint, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D133/00C09D161/28C09D179/00B05D1/36B05D7/00C08G18/08C08G18/44
CPCC08G18/0823C09D175/04B05D7/572C08G18/44B05D1/36C08G18/0866C08G18/10C09D133/00C09D161/28C09D179/00C08G18/08
Inventor 中江泰彦马越淳夫今村毅竹迫祥一濑川大介
Owner NIPPON PAINT GUANGZHOU
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