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

Radiation-cured coating agent

A coating and initiator technology, applied in the field of water-based coating compositions, can solve the problems of low UV reactivity, low double bond density, poor drying, etc.

Inactive Publication Date: 2005-09-28
COVESTRO DEUTSCHLAND AG
View PDF14 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage here is the relatively low UV reactivity due to the low double bond density and poor initial physical drying before UV curing due to the relatively low molecular weight of urethane methacrylates

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
  • Radiation-cured coating agent
  • Radiation-cured coating agent
  • Radiation-cured coating agent

Examples

Experimental program
Comparison scheme
Effect test

example

[0126] UV Curable Polyurethane Dispersion (B)

example 1

[0128] Preparation of polyester acrylate 1a) , according to a method similar to DE-C 197 15 382 (p.5, line 21-27), hydroxyl value: 160 mg KOH / g, acid value: 1 mg KOH / g, viscosity at 23° C.: 0.5 Pa.s.

[0129] Preparation of polyester acrylate 1b):

[0130] In a heatable reactor with stirrer, gas inlet, temperature measurement, water separator and reflux condenser, 98.1 g maleic anhydride, 739.2 g tetrapropoxylated trimethylolpropane, 259.2 g acrylic acid, 10.5 g of 4-toluenesulfonic acid monohydrate, 3.2 g of 4-methoxyphenol, 0.2 g of 2,5-di-tert-butylhydroquinone and 448.3 g of isooctane were heated under reflux with stirring and an air flow of 1 L / h introduced. Water is separated at 100°C to 105°C until the acid value reaches 5 or lower. Then, the solvent was distilled off under reduced pressure. As a result a polyester acrylate was obtained with an acid value equal to 4 mg KOH / g, a hydroxyl value of 110 mg KOH / g and a viscosity at 23° C. equal to 1.6 Pa·s.

[0131] ...

example 2

[0136] Preparation of polyurethane dispersion:

[0137] In a reaction vessel with stirrer, internal thermometer and gas inlet (air flow 1 L / h), 113.7 g of Desmodur  I (aliphatic diisocyanate; Bayer (Leverkusen, Germany)) and 56.6 g Desmodur  H (aliphatic diisocyanate; Bayer Company (Leverkusen, Germany)) was added to the epoxy acrylate Ebecryl  600 (UCB company, Kerpen, Germany), 34.5g polyacrylate diol Tegonmer  In an initial charge of BD 1000 (Goldschmidt, Essen, Germany), 9.8 g neopentyl glycol, 17.1 g dimethylolpropionic acid, 0.4 g dibutyltin dilaurate and 133.8 g acetone, the mixture was heated so as to maintain constant acetone reflow. The reaction mixture was stirred at this temperature until it contained an NCO content equal to 4.0±0.1% by weight.

[0138] The reaction mixture was then cooled to 40°C and 495.1 g of acetone were added. After stirring for 5 min at 40° C., 15.84 g of ethylenediamine in 63.7 g of water were added. When the NCO content reached ...

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
acid valueaaaaaaaaaa
hydroxyl valueaaaaaaaaaa
acid valueaaaaaaaaaa
Login to View More

Abstract

The invention relates to aqueous coating agents based on polyurethane dispersions, which cure under the influence of high-energy radiation. The invention also relates to a method for the production and use of the same.

Description

technical field [0001] The invention relates to aqueous coating compositions based on polyurethane dispersions curable under the influence of high-energy radiation, a process for their preparation and their use. Background technique [0002] One-pack (1K) aqueous coating compositions comprising a binder containing active hydrogen atoms and a crosslinker and crosslinked and cured by means of thermal activation are known from the prior art. However, the disadvantage of such systems is that the curing process is slow and high temperatures are required. [0003] Aqueous coating compositions that correspond to physical curing of coatings by film formation are also known. In such systems, generally no crosslinkers are used. Physical curing can be assisted by chemical crosslinking using atmospheric oxygen. [0004] Coatings based on radiation-curing polyurethane dispersions, ie polyurethane dispersions containing polymerizable groups, cure much faster. Such dispersions are desc...

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): B05D3/06B05D7/24C08F299/06C08G18/08C08G18/12C08G18/62C08G18/68C08G18/70C08G18/80C09D5/02C09D7/12C09D175/14C09D175/16C09J11/06C09J175/14C09K3/10
CPCC08G18/0823C08G18/12C08G18/0828C09D175/14C08G18/68C08G18/8077Y10T428/31551C08G18/706C08G18/6225C08G18/3234C08G18/3228C08L75/04C09D175/16
Inventor J·维卡E·吕曼C·伊尔勒T·里谢K·瑙约克斯T·菲勒J·马扎内克
Owner COVESTRO DEUTSCHLAND AG