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Composition containing a modified (poly)isocyanate and a solvent of the acetal or aliphatic ketone type, and use of said composition for producing coatings

A polyisocyanate and isocyanate technology, applied in polyurea/polyurethane coatings, coatings, organic chemistry, etc., can solve problems such as insoluble

Active Publication Date: 2012-08-22
VENCOREX FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been observed, however, that such modified (poly)isocyanates, especially hexamethylene diisocyanate derivatives, are poorly soluble in solvents commonly used to formulate polyisocyanate derivatives such as n-butyl acetate, aromatic alkyl compounds such as Solvesso middle

Method used

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  • Composition containing a modified (poly)isocyanate and a solvent of the acetal or aliphatic ketone type, and use of said composition for producing coatings
  • Composition containing a modified (poly)isocyanate and a solvent of the acetal or aliphatic ketone type, and use of said composition for producing coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Other details or advantages of the present invention will become more apparent from the examples given below. Example Starting materials Jeffsol : Glycerol Carbonate, marketed by the company Huntsman and hereinafter indicated as GC; CAS No.: 931-40-8, MW=118.09 g / mol; Other names: Glycerol Carbonate (glycerol carbonate). HDT, marketed by Rhodia Corporation: Hexamethylene diisocyanate oligomer; CAS No.: 28182-81-2 Vialkyd AN 903 / 70EPAC, marketed by the company Cytec: 70% by weight polyester resin in ethoxypropyl acetate (70EPAC). % OH (by weight) on a dry solids basis: about 4.4%. Highsolv P , sold by the company Clariant: tetramethoxyethane, hereinafter denoted as solvent for HSP. stobicoat N873, marketed by the company Stockmeier: epoxy-amine system. Jeffamines , sold by Huntsman Company: Jeffamine XTJ 582, CAS No.: 9046-10-0; polyoxypropylene diamine 60-100% NH 2 -CH-(CH 3 )-CH 2 -[O-CH 2 -CH(-CH 3 )] n -O-CH 2 -CH(-CH 3 )-NH 2 Jeffa...

Embodiment 2

[0077] Add 50ppm of dibutyltin dilaurate (DBTL) catalyst, relative to HDT meter. The heating temperature was fixed at 90°C. After 5 minutes, the reaction was exothermic, reaching a temperature of 170°C. After cooling and maintaining the temperature of the medium at about 120° C. for 40 minutes, the product is analyzed by infrared spectroscopy. The NCO functions have disappeared and the product obtained is a polyisocyanate mainly having isocyanurate units, the NCO functions of which have been blocked to an extent of 100% by glycerol carbonate. It's labeled HDT-GC. Example 2 : With isocyanate functional groups masked by glycerol carbonate Study on Solubility of HDT

[0078] About 2.5 g of pure HDT GC from Example 1 was weighed into eleven 10 mL flasks.

[0079] About 0.83 g of solvent was then added to each flask in order to obtain a product with a solids content of 75%. The flask was closed. Each mixture was heated at about 100°C to melt the product, which was dissol...

Embodiment 3

[0084] Regardless of the solids content, it should be noted that Highsolv P allows the Good solubilization of the reaction product between HDT and glycerol carbonate, while the solvents usually used to solubilize polyisocyanates are not suitable. Example 3 : Synthesis of HDT-GC in Highsolv P at 75 wt%

[0085] A stream of argon was introduced into a 1-liter jacketed reactor, followed by successive introductions of: -402.5 g of HDT with an isocyanate (NCO) functional group content of 0.501 mol / 100 g, ie 21 wt% NCO functional groups / 100 g product; -237.9 g of glycerol carbonate (Jeffsol GC) (2.01 mol); and -213.4 g of HighSolv P.

[0086] The molar ratio of NCO functional groups / OH functional groups is 1. After heating at 110° C., it is then routinely checked by infrared whether the isocyanate functionality is still present in the medium. After 18 hours, all NCO functionalities had reacted (monitored by infrared) and the solids content of the final product was 75% solids.

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Abstract

The invention relates to a modified (poly)isocyanate composition that contains a modified (poly)isocyanate and at least one solvent. The invention also relates to the use of this composition for preparing coatings such as paints and varnishes.

Description

technical field [0001] The present invention relates to a composition based on a modified (poly)isocyanate comprising a modified (poly)isocyanate and at least one solvent. The invention also relates to the use of such compositions for the preparation of coatings such as paints or varnishes. Background technique [0002] It is well known that diisocyanates, especially alkylene diisocyanates and their biuret-type derivatives or their trimers are widely used in the field of paints and varnishes. [0003] Until recently, such products were generally used in the form of solutions in organic solvents. Today, due to the toxicity of certain organic solvents, attempts are still being made to develop techniques using only small amounts of solvents or even no solvents. Accordingly, polyisocyanate-based compositions have been developed that are both easy to emulsify and to use as emulsions in water. In this case the water serves as a vehicle for the components of the formulation and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/08C08G18/28C08G18/79C08G18/80C08G71/04C09D175/04C07C43/30
CPCC09D175/04C08G18/792C08G18/2815
Inventor J-M・贝尔纳A・若米耶
Owner VENCOREX FRANCE