Polyester coating and preparation method thereof

A polyester coating and di-polyester technology, applied in the coating field, can solve the problems of incomplete curing, poor flexibility, poor performance of paint film peeling, etc., and achieve the effect of excellent adhesion

Inactive Publication Date: 2016-05-04
NIPPON PAINT TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing single coating has poor adhesion to the substrate, poor flexibility, and incomplete curing, resulting in poor performance such as cracking and peeling of the paint film after pressing, and cannot meet the performance requirements of users.

Method used

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  • Polyester coating and preparation method thereof
  • Polyester coating and preparation method thereof
  • Polyester coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A preparation method of polyester coating includes the following steps:

[0060] Step 1: Sanding 35.0 parts by weight of the first polyester resin, 1.0 parts by weight of dispersant, 30.0 parts by weight of coloring pigments, 0.3 parts by weight of anti-settling additives, and 10.0 parts by weight of S-150 solvent oil to obtain slurry;

[0061] Step 2: Add 10.0 parts by weight of second polyester resin, 5.0 parts by weight of amino resin, 0.4 parts by weight of catalyst, 2.0 parts by weight of adhesion promoter, 1.0 parts by weight of leveling agent, and 1.0 parts by weight of defoamer into the slurry Parts, 2.0 parts by weight of matting agent, 1.0 parts by weight of wax additives, and 10.0 parts by weight of S-150 solvent naphtha, and mixed to obtain the polyester coating.

[0062] In the step 2, the viscosity of the polyester coating is adjusted to: 130-150 seconds, measured with a Tu-4# cup at 25°C (130-150 seconds / Tu-4# cup / 25°C); or adjusted to 500- 600mPa.s.

[0063] Th...

Embodiment 2

[0069] A preparation method of polyester coating includes the following steps:

[0070] Step 1: Mix 35 parts by weight of the first polyester resin, 1.0 parts by weight of dispersant, 30 parts by weight of coloring pigments, 0.3 parts by weight of anti-settling aids, and 10.0 parts by weight of S-150 solvent oil, and sand to obtain a slurry;

[0071] Step 2: Add 10.0 parts by weight of second polyester resin, 3.0 parts by weight of amino resin, 0.4 parts by weight of catalyst, 2.0 parts by weight of adhesion promoter, 1.0 parts by weight of leveling agent, and 1.0 parts by weight of defoamer into the slurry Parts, 2.0 parts by weight of matting agent, 1.0 parts by weight of wax additives, and 10.0 parts by weight of S-150 solvent naphtha, and mixed to obtain the polyester coating.

[0072] In the step 2, the viscosity of the polyester coating is adjusted to: 130-150 seconds, measured with a Tu-4# cup at 25°C (130-150 seconds / Tu-4# cup / 25°C); or adjusted to 500- 600mPa.s.

[0073] The...

Embodiment 3

[0081] A preparation method of polyester coating includes the following steps:

[0082] Step 1: Mix 35.0 parts by weight of the first polyester resin, 1.0 parts by weight of the dispersant, 40.0 parts by weight of the coloring pigment, 0.3 parts by weight of the anti-settling aid, and appropriate amount of ethylene glycol butyl ether, and sand to obtain a slurry;

[0083] Step 2: Add 10.0 parts by weight of second polyester resin, 5.0 parts by weight of amino resin, 0.4 parts by weight of catalyst, 2.0 parts by weight of adhesion promoter, 1.0 parts by weight of leveling agent, and 1.0 parts by weight of defoamer into the slurry Parts, 2.0 parts by weight of matting agent, 1.0 parts by weight of wax additives, and 10.0 parts by weight of S-150 solvent naphtha, and mixed to obtain the polyester coating.

[0084] In the step 2, the viscosity of the polyester coating is adjusted to: 130-150 seconds, measured with a Tu-4# cup at 25°C (130-150 seconds / Tu-4# cup / 25°C); or adjusted to 500- ...

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Abstract

The invention discloses a polyester coating. The polyester coating comprises first polyester resin, second polyester resin, amino resin, coloring pigment and aids, wherein the pigment / binder ratio of the polyester coating is 0.7-1.3, the polyester-amino ratio is 3-8, and a conventional dosage of aids is used; the molecular weight of the first polyester resin is 5,000-7,000, the hydroxyl value is 6-35 mgKOH / g, the acid value is smaller than or equal to 5 mgKOH / g, and the glass transition temperature (Tg) ranges from 20 DEG C to 45 DEG C; the molecular weight of the second polyester resin is 5,000-7,000, the hydroxyl value is 3-15 mgKOH / g, the acid value is smaller than or equal to 5 mgKOH / g, and the glass transition temperature ranges from subzero 10 DEG C to 10 DEG C. The invention further discloses a preparation method of the polyester coating. A coating film of the polyester coating has good flexibility, good adhesion to a substrate and good chemical resistance, hardness, scratch resistance and other properties.

Description

Technical field [0001] The invention relates to the technical field of coatings, in particular to a polyester coating and a preparation method thereof. Background technique [0002] Coating is a homogeneous mixture composed of colored bodies (such as pigments, dyes, etc.), binders, filling (filling) materials, additional materials, etc. The coating can be printed, and it can be attached to the printed body after drying. It can be colored. Paste-like glue with certain fluidity. Therefore, color (hue), rheological properties (thinness, fluidity) and drying properties are the three most important properties of coatings. There are many types of coatings and their physical properties are also different. Some are very thick and sticky, and some are very thin. [0003] Coil coating includes coil steel coating and coil aluminum coating. It is a special coating that is applied to steel plate and aluminum plate to protect and decorate steel plate and aluminum plate. It is a method of apply...

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D161/20
CPCC09D167/00C08L2205/025C08L2205/035C08L67/00C08L61/20
Inventor 王华益
Owner NIPPON PAINT TIANJIN
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