Unlock instant, AI-driven research and patent intelligence for your innovation.

Powder coating composition

A technology of powder coatings and compositions, applied in the direction of polyester coatings, epoxy resin coatings, coatings, etc., can solve problems such as high-reactivity powder coatings that are not described

Active Publication Date: 2019-12-06
TIGERWERK LACK & FARBENFAB
View PDF9 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Highly reactive powder coatings are not described in this document

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Powder coating composition
  • Powder coating composition
  • Powder coating composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1-A6

[0084] Examples A1 to A6 serve to investigate which amorphous polyesters and which epoxy resins can be used in the highly reactive powder coatings according to the invention.

[0085]Amorphous polyesters have the following acid values. "Polyester 1" is a carboxylic polyester with an acid value of 68 to 76 mg KOH / g and a viscosity of 2.0 to 3.5 Pa*s (measured at 200°C on a Brookfield CAP 2000+ using the cone and plate method), which is composed of The essential components consist of terephthalic acid, adipic acid, neopentyl glycol, monoethylene glycol and trimellitic anhydride and are prepared by melt polymerization at temperatures up to 240°C.

[0086] "Crylcoat 1783-0" has an acid value of 30 to 38 mg KOH / g and a viscosity of 4.2 to 5.8 Pa*s (Brookfield viscosity @ 200°C). Crycloat 1626-0 has an acid number of 44-52 mg KOH / g and a viscosity of 2 to 4 Pa*s (Brookfield viscosity @ 200°C). Crycloat 1660-0 has an acid number of 45 to 51 mg KOH / g and a viscosity of 6.8 to 10.2 P...

Embodiment A1

[0088] Table 2 - Examples A1) to A6) with different amorphous polyester resins and different epoxy resins

[0089]

[0090]

[0091] Table 3 - Test results of Examples A1) to A6)

[0092]

[0093] As can be seen from Examples A1 to A6, only Example A1 with a gel time of 159 seconds (measured at 130° C.) exhibits sufficient reactivity. Other examples using amorphous polyester resins with an acid value less than 50 KOH / g and epoxy resins with an EEW greater than 650 g / equivalent have too little reactivity and cannot be cured under the bake conditions.

Embodiment 1

[0094] Embodiments 1) to 12):

[0095] In the following examples powder coatings are described which meet the requirements for reactivity, deformability and stability on storage.

[0096] Powder coatings consist of the following components:

[0097] Polyester 1 has already been described above in Examples A1) to A6). Araldite GT 7220 (from Huntsman) is an epoxy resin based on bisphenol A and phenol novolac with an EEW of 518 to 546 g / eq. Polyester 7 is a (semi)crystalline polyester resin made from succinic acid and 1,4-butanediol with an acid value of 28 to 36 mg KOH / g and a viscosity of 0.1 to 0.2 Pa*s (using Brookfield CAP 2000+ measured using cone and plate measurement) with a melting point of 120.4° C. (maximum melting peak measured using DSC at a heating rate of 20 K / min).

[0098] Eutomer B31 (from Eutec Chemical Co.) is a 2-phenyl-2-imidazoline catalyst.

[0099] Polyester 2 is an OH functional polyester containing about 10% by weight ethyltriphenylphosphonium bro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
glass transition temperatureaaaaaaaaaa
epoxy equivalentaaaaaaaaaa
acid valueaaaaaaaaaa
Login to View More

Abstract

The invention relates to a powder coating composition containing a binder combination. The binder combination comprises the following components: A) 15 to 70 wt.% of the binder of one or more amorphous carboxyl group-containing polyester resins, having an arithmetically averaged acid number of 50 to 100mg KOH / g, B) 20 to 50 wt.% of the binder of one or more epoxide group-containing polymers with an arithmetically averaged epoxide equivalent weight of 350 to 650 g / eq, preferably 400 to 650 g / eq, preferably based on bisphenol A and phenol novolak, C) 5 to 55 wt.% of the binder of one or more crystalline or semi-crystalline carboxyl group-containing polyester resins, having an arithmetically averaged acid number of 15 to 00 mg KOH / g, D) 0.5 to 6 wt.% (based on the entire formulation) of one or more catalysts (accelerants) for the crosslinking reaction(s), and optionally E) 0 to 10 wt.% (based on the entire formulation) of one or more components with reactive groups for the crosslinking reaction(s) with the carboxyl groups and / or epoxide groups of the components A), B), and C). The polyester resins according to A) and C) contain a sum of 15 to 75 wt.%, preferably 15 to 60 wt.% and particularly preferably 20 to 50 wt.%, based on the monomers used for the synthesis, of linear and unbranched aliphatic diols or the derivatives thereof and / or linear and unbranched aliphatic dicarboxylicacids or the derivatives thereof. The invention additionally relates to a method for producing such a powder coating composition and to the use thereof.

Description

technical field [0001] The present invention relates to powder coating systems which can be cured at very low baking temperatures and which have very good deformability. Background technique [0002] The powder coatings according to the invention contain (semi)crystalline components and can be used to coat a wide variety of substrates. In particular, heat-sensitive substrates such as wood can be coated at low baking temperatures and short baking times to obtain smooth or textured powder-coated surfaces with good mechanical properties. Owing to the improved properties, in particular the improved flexibility and deformability, single-layer coatings of these powder coatings can be applied to wood with a low risk of crack formation due to dimensional changes of the substrate. The present invention includes low temperature powder coatings having smooth and textured surfaces and varying gloss levels from dark ripe to high gloss. [0003] For coating heat-sensitive substrates, ac...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D167/00
CPCC09D163/00C09D167/00C08G2150/20C08L63/00C08L67/00C08K5/19C08K5/5393C09D5/033
Inventor 伯恩哈德·布吕斯特勒格尔德·施拉格尔
Owner TIGERWERK LACK & FARBENFAB