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Aqueous radiation curable polyurethane compositions

A water-based composition and hydrophilic compound technology, applied in polyurea/polyurethane coatings, chemical instruments and methods, synthetic resin layered products, etc., can solve problems such as pigment migration, annoying regular cleaning, and expensive

Active Publication Date: 2011-05-11
CYTEC SURFACE SPECIALTIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, the pigment may migrate onto the roll during sanding sealer application
Known radiation curable wood stains have the disadvantage of sticking to the brush used after the radiation curable stain has been applied to ensure good and uniform penetration of the stain into the wood structure
Regular cleaning of brushes is tiresome and expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0076] Preparation Example 1: Preparation of Aqueous Polyurethane Dispersion

[0077] A double-walled glass reactor equipped with a mechanical stirrer, thermometer, steam condenser and dropping funnel was charged with 109.6 g of 1,6-hexamethylene diisocyanate and 0.14 g of bismuth octoate. The reaction mixture was heated and 194.2 g of the reaction product of 1 mole of ethoxylated trimethylolpropane TMP-3EO with 2 moles of acrylic acid, 55.5 g of monofunctional epoxy acrylate A mixture of 113 and 1.1 g of 4-methoxyphenol was slowly added to the reactor. Maturation was carried out until an isocyanate content of 1.79 meq / g was reached. Then 35.1 g of dimethylolpropionic acid and 1.1 g of 4-methoxyphenol were added to the reaction mixture and the mass temperature was heated to 95°C. Curing is carried out at 95° C. until an isocyanate content of <0.02 meq / g is obtained. The reaction mixture was cooled and 23.4 g of 25% by weight aqueous sodium hydroxide was added to the reacto...

Embodiment 1

[0083] 10 parts of trimethylpropane triacrylate were added to 85.5 parts of the UV curable polyurethane dispersion of Preparation Example 1 . Then use 3% photoinitiator ( BCPK) formulate the composition and use up to a maximum of 2% thickener 8460:Water (1:1) to adjust the viscosity to about 1500 mPa.s (Brookfield) and evaluate its dispersion stability.

[0084] The compositions and the properties of the coatings obtained therewith are shown in Table 1.

[0085] Stability (of the dispersion): After carrying out the standard test - 10 days at 60°C - check the dispersion / emulsion for any precipitation or other changes, eg particle size or pH. If no significant changes are observed, the sample is accepted.

[0086] Stain Resistance: This method includes the chemical resistance of a 36μ coating wet applied to a non-porous substrate (half white, half black Leneta paper). The coating was dried at 60° C. for 5 minutes and then cured under a UV lamp (Hg) of 80 W / cm at 5 m / min. ...

Embodiment 4

[0092] In Example 4, trimethylolpropane triacrylate was replaced with a mixture of pentaerythritol triacrylate and pentaerythritol tetraacrylate.

[0093] Table 1

[0094]

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Abstract

The present invention relates to an aqueous composition comprising from 5 to 90 % by weight of a polymerizable ethylenically unsaturated water dispersible polyurethane (A) and from 1 to 60 % by weight relative to the weight of polyurethane (A) of a least one polymerizable ethylenically unsaturated compound (B) having a water solubility at 25 DEG C of less than 50 g / l, and it use for making high gloss coatings as well as wood stains.

Description

technical field [0001] The present invention relates to aqueous radiation-curable polyurethane compositions which are particularly suitable for producing coatings on various substrates, such as wood and plastics. Background technique [0002] Radiation-curable polyurethane dispersions have long been known to provide coatings for different substrates such as metals, different woods and plastics, and exhibit good mechanical and chemical resistance and some flexibility. [0003] Ethylenically unsaturated polyurethanes have been prepared from polyisocyanates, mixtures of low and high molecular weight polyols, and hydroxyl functional ethylenically unsaturated monomers. The molecular weight of the resulting ethylenically unsaturated polyurethane prepolymers is sometimes increased even further by chain extension with polyamines. The resulting polymers generally have a very high molecular weight and, due to the high hard segment content or because their glass transition temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/08C09D175/16
CPCC08F283/006C08F290/067C08F290/147C08G18/0823C08G18/348C08G18/673C08G18/73C09D175/16C08G18/12C08G18/67C08K5/10C08L75/14C09D175/14B05D3/06C08F283/008B32B27/40B05D2401/20B05D2201/02B05D2203/20B05D2503/00
Inventor J·范霍伦S·卡佩勒X·德吕泰勒M·蒂勒曼斯
Owner CYTEC SURFACE SPECIALTIES INC