Water-emulsifiable isocyanates with improved properties

A kind of technology of isocyanurate and isocyanate group, applied in the field of preparing water emulsifiable isocyanate

Active Publication Date: 2011-12-14
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] 1. The isocyanate should be easy to emulsify: it is not in favor of having to use a forced device such as a high-shear stirring device;

Method used

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  • Water-emulsifiable isocyanates with improved properties
  • Water-emulsifiable isocyanates with improved properties
  • Water-emulsifiable isocyanates with improved properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] 250 g of polyisocyanate B and 26.25 g of polyether A were reacted with the addition of 0.068 g of zinc neodecanoate (50% solution in butyl acetate) as a catalyst. After 1 hour at 80° C., the NCO content was 13.2%. Then, 117 g of polyisocyanate A and 17.55 g of polyether A were added. The corresponding product has an NCO content of 13.25% and a viscosity of 1770 mPas at 23°C.

[0120] Prior to processing, the product was dissolved at an 80% concentration in DMM.

[0121] Performance results:

[0122] Coating Formulation

[0123] 100g 8311 (aqueous polyol based on acrylate, BASF SE, OH value is 120mgKOH / g, 42% aqueous solution) with 1.74g butyl diglycol acetate and 4.25g butyl glycol as coalescent Acetate mix. The pH was then adjusted to 8.5 with 1.05 g of a 50% strength aqueous solution of dimethylethylamine. Finally, adjust the application viscosity with 5.80g of water and add 0.57g 340 (BYK) defoamer.

[0124] The polyisocyanic acid is then introduced with...

Embodiment 2

[0127] 60 g (0.246 equivalents of NCO) of isocyanate B were added to 6.7 g (0.007 mol) of monofunctional polyethylene oxide having a molecular mass of 1000 and prepared starting from methanol, and the components were stirred at 130° C. for 80 minutes. The mixture was then cooled to room temperature. The product is a solid polyisocyanate (=b1) with an NCO content of 15.2%. Pure hydrophilized isocyanate b1 can be emulsified in water, giving a white macroemulsion only with considerable mechanical effort.

[0128] By preparing a mixture of isocyanates a1 and b1 from WO 2004 / 22624 A1 Example 1 at 100° C., an easily emulsifiable product is obtained which exhibits good emulsification and good properties with regard to coating hardness.

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Abstract

Preparing a mixture comprising (a) an isocyanurate and / or a biuret of 1,6-diisocyanatohexane, (b) an isocyanurate of 1-isocyanato-3,5,5-trimethyl-5-isocyanatomethyl cyclohexane, (c) at least one emulsifier obtained by reacting (a) and / or (b) with a component (c1) comprising at least one group reactive to isocyanate and at least one hydrophilic group, and (d) optionally a solvent, comprises: (i) reacting at least a part of (b) with the component (c1); and then (ii) reacting at least a part of (a) with the component (c1) in the presence of the resulting reaction mixture of the step (i).

Description

technical field [0001] The invention relates to a process for the preparation of water-emulsifiable isocyanates and their use. Background technique [0002] Water-emulsifiable polyisocyanates are added to aqueous polymer dispersions as crosslinkers and have been extensively described in the literature. Emulsifiability in water is brought about by mixing an emulsifier obtained by reacting polyisocyanate and hydrophilic molecules with polyisocyanate. [0003] Commonly used hydrophilic molecules include nonionic hydrophilic molecules such as polyoxyalkylene alcohols. [0004] EP-A2 206 059 describes water-dispersible polyisocyanate formulations comprising aliphatic polyisocyanates and aliphatic polyisocyanates with nonionic mono- or polyhydroxyl groups containing at least one polyether chain comprising at least 10 ethylene oxide units Reaction product of polyalkylene ether alcohol emulsifiers. Numerous examples of aliphatic and cycloaliphatic diisocyanates are given as suita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C08G18/73C08G18/78C08G18/48
CPCC08G18/706C08G18/7831C08G18/10C08G18/792C08G18/283C08G18/222C08G18/722C08G18/6229
Inventor A・M・施泰因布雷歇尔L・土施布莱特F・卢卡斯O・伊利扎尔德
Owner BASF AG
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