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Isocyanate composition containing a masked and an unmasked isocyanate and their use for coating

A technology of isocyanate and free isocyanate, which is applied in the field of isocyanate composition and can solve problems such as toxicity

Inactive Publication Date: 2004-01-07
VENCOREX FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, the TGIC-polyester systems are considered toxic and regulations restrict their use very broadly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Synthesis example of powder with free NCO IPDT. Example 1-Powder polyisocyanate composition (triazole blocked HDT / IPDT (70 / 30 weight / Weight)

[0068] 290g of hexamethylene diisocyanate trimer (Tolonate HDT) (NCO content: 0.521 equivalent / 100g), 107.5g of 1,2,4-triazole and 3.98g of triethylamine (relative to all compounds, 1% ( Mass) / 2.6 mol% relative to the free NCO functional groups of HDT) were added sequentially to the stirred, jacketed reactor. The reaction medium is heated to 95°C. The reaction is exothermic and the temperature of the reaction medium rises to 125°C. The temperature slowly dropped back to 95°C. After 1 hour and 30 minutes, infrared analysis of the sample showed that all isocyanate functional groups were blocked by triazole. Then, 170.5 g of isophorone diisocyanate trimer (IPDT) (NCO content: 0.45 equivalent / 100 g) was added at 110°C. After mixing for 15 minutes, the product was decanted and then ground to obtain 568 g of a white powder with a stora...

Embodiment 2

[0070] Example 2-Synthesis of powder polyisocyanate composition (triazole / p-hydroxybenzyl Acid (80 / 20mol / mol) blocked HDT / IPDT (70 / 30 weight / weight)). (TOL 6598)

[0071] 201.84g Tolonate HDT, 58.11g 1,2,4-triazole and 33.41g p-hydroxybenzoic acid were sequentially added to a stirred 500ml jacketed reactor. The reaction mixture was heated to 90°C. After reacting for 1 hour, 2.93 g of triethylamine was added. After 1 hour and 30 minutes, infrared analysis of the sample showed that all isocyanate functional groups were blocked by triazole. 125.73 g of isophorone diisocyanate trimer was added at 110°C. After 1 hour of mixing, the product was decanted and then ground to obtain 420 g of a white powder with storage stability and a Tg of 45°C (that is, 20°C higher than the product without IPDT).

[0072] The composition therefore includes HDT polyisocyanates having isocyanate functional groups masked by a mixture of blocking agents, one of which includes carboxylic acid functional gr...

Embodiment 3

[0075] Example 3 (comparative)-HDT masked by triazole

[0076] Add the following components to a 250ml reactor in turn-107.5g hexamethylene diisocyanate isocyanurate trimer known to the public under the trade name HDT. Its isocyanate (NCO) functional group content is 0.526mol NCO Functional group / 100g product, -39.3g 1,2,4-triazole (purity equal to 99.5%).

[0077] The reaction mixture was then heated to 130°C and stirred. After 1 hour of reaction, infrared analysis of the reaction mass sample showed that the reaction to mask the isocyanate functional group was terminated. Observed at 2272cm -1 The band representing the isocyanate functional group disappeared.

[0078] The product was then poured on the plate and then allowed to cool. The product is then milled at a temperature of -10°C.

[0079] At room temperature, the ground product behaves similarly to the immediately used binder (sticky as bitumen) and cannot be obtained as a powder for disposal under ordinary industrial con...

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PUM

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Abstract

The invention concerns an isocyanate composition useful for applying powder paints. Said composition is characterized in that it contains a masked isocyanate compound and an unmasked cycloaliphatic isocyanate compound. The invention is applicable in the chemistry of paints.

Description

Technical field [0001] The subject of the present invention is a new family of isocyanate compositions including both masked isocyanate and unmasked isocyanate. More specifically, the present invention relates to isocyanate compositions in powder form, including in powder mixture form, more precisely for forming what is called a one-component (sometimes denoted by the term "one-shot") paint powder. Background technique [0002] Due to environmental protection and operational safety reasons, people are increasingly trying to avoid the use of solvents in coating technology and especially in paint technology. More specifically, reducing V.O.C. (volatile organic compounds) is an increasingly common focus of attention in the paint and varnish industry. [0003] For this reason, changes in the product toward higher solids content make it possible to reduce the amount of solvent needed to achieve the application viscosity and thus reduce the evaporation of solvent during the drying proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/79C08G18/80C09D5/03C09D175/04
CPCC08G18/8067C08G18/8061C08G18/807C08G18/792C08G2150/20C08G18/72
Inventor J-M·伯纳德B·沃根
Owner VENCOREX FRANCE
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