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Crosslinking composition

A technology of cross-linking compositions and mixtures, applied in the direction of coating, etc., can solve the problems of non-disclosure and disclosure

Active Publication Date: 2006-05-03
ALLNEX NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent does not disclose and disclose the reaction of amino compounds with mono(alkylaldehydes) and / or poly(alkylaldehydes) and alcohols to form crosslinked compositions

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0102] Preparation of Glycoluril-Urethane Aldehyde Resin

[0103] In a suitable flask at room temperature put 1.5 g of Na 2 CO 3 and 139 grams of water. To this well stirred solution was added 150 grams of 50% glutaraldehyde in water. Cooling in an ice bath, lowering the temperature and maintaining it at about 25°C, 72.5 grams of propionaldehyde and then 35.5 grams of glycoluril were added with stirring. The temperature was then raised to about 35°C and maintained at this temperature until the solution became clear. Then about 30 grams of urea was added and reacted for about 0.5 hours.

[0104] Afterwards, 2.5 g of 97% H 2 SO 4 250 g of anhydrous MeOH, and the temperature was maintained at 25 °C (ice bath) for about 1 hour. Then, the reaction mixture was neutralized with 50% NaOH to pH 8-8.2. The reaction mixture was stripped under good vacuum at about 40-50°C to remove all MeOH and as much water as possible. After stripping, about 36 grams of propionaldehyde was adde...

Embodiment 2

[0107] Coating composition containing glycoluril-urethane aldehyde resin

[0108] A coating formulation was prepared using the crosslinked resin of Example 1 by adding 3.0 grams of Dynotol T-49emp alkyd backbone resin (85% solids in alcohol) to 3.0 grams of the crosslinked resin of Example 1, 0.3 grams of CYCAT 4040 catalyst (40.0% p-toluenesulfonic acid monohydrate in isopropanol) and 1.0 g of acetone solvent. The formulation was applied as a film about 2 mils thick on cold rolled steel panels treated with iron phosphate using a wire wound cator (#52). The panels were then allowed to cure for 7 days at room temperature (23-25°C). The film is colorfast and has a solvent resistance of greater than 100 double wipes to methyl ethyl ketone (MEK). A control plate without the crosslinked resin containing Dynotol T-49emp plus 0.3 grams of CYCAT 4040 catalyst and 1.0 grams of acetone solvent had a solvent resistance of less than 3 MEK double rubs and was yellowish.

Embodiment 3

[0109] Example 3. Preparation of melamine-urethane aldehyde resin

[0110] Into a suitable flask put 35 g of water and 0.50 g of K 2 CO 3 . The resulting solution was heated to 40°C, and 30.0 g of urea was added and stirred thoroughly to dissolve. To this reaction mixture was added 12.6 g of melamine with good stirring. To this slurry was slowly added 40.6 grams of propionaldehyde, keeping the temperature below 55-57°C. After the addition was complete, the reaction mixture was refluxed for 1 hour, cooled to room temperature and 30.0 g of 50% glutaraldehyde was added. After stirring at room temperature (22-25°C) for several hours, the reaction mixture became homogeneous, and 135 g of anhydrous methanol was added, and 5.5 g of 70% HNO 3 Adjust the pH to 4.3. The batch was allowed to react at room temperature for about 1 hour, adjusting the pH to 8.1 with 5.5 grams of 50% NaOH. The batch was then stripped under high vacuum at about 40-50°C to remove excess methanol and onl...

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Abstract

The present invention relates to a cross-linking composition comprising a compound having the structure of formula I: A'-NRA-RD, wherein A' is a moiety derived from the following groups: linear or cyclic urea, cyanuric acid, substituted cyanide Uric acid, linear or cyclic amide, glycoluril, hydantoin, linear or cyclic carbamate, and their mixtures, or a moiety containing the structure of formula II: wherein, RA is RD, hydrogen, 1-20 An alkyl group of carbon atoms, or form a ring compound together with A'; RD is -CHRCORB, where RB is hydrogen, an alkyl group, aryl group, aralkyl group or alkaryl group with 1 to 24 carbon atoms, and RC is an organic Alkyl, halogenated alkyl, aryl, aralkyl, halogenated aralkyl, alkoxyalkyl or alkaryl of 1 to 24 carbon atoms; A is a moiety derived from: linear or cyclic Urea, cyanuric acid, substituted cyanuric acid, linear or cyclic amides, glycolurils, hydantoins, linear or cyclic carbamates, and mixtures thereof; B is poly(alkyl) having n aldehyde groups aldehyde) residue; n is an integer of 2-8; RA is RD, hydrogen, an alkyl group of 1-20 carbon atoms, or forms a cyclic compound together with A; where RD is CHRCORB, where RB is hydrogen, and Alkyl, aryl, aralkyl or alkaryl with 1 to 24 carbon atoms, RC is an alkyl with 1 to 24 carbon atoms, halogenated alkyl, aryl, aralkyl, halogenated aralkyl, Alkoxyalkyl or alkaryl; the alkyl or aryl groups on each group may also have heteroatoms in their structure. The present invention also relates to a method for preparing a crosslinking composition comprising reacting an amino group-containing amino compound; mono(alkylaldehyde) and / or poly(alkylaldehyde); and an alcohol; said amino compound being selected from the group consisting of linear Or cyclic ureas, cyanuric acids, substituted cyanuric acids, linear or cyclic amides, glycolurils, hydantoins, linear or cyclic carbamates, and mixtures thereof.

Description

field of invention [0001] The present invention relates to aminoplast-based crosslinked compositions and a process for their preparation. In particular, the invention relates to aminoplast-based crosslinking compositions, which can be prepared by reacting amino compounds with mono(alkylaldehydes) and / or poly(alkylaldehydes) and alcohols. Background of the invention [0002] Most conventional industrial coatings have for many years been based on backbone resins with active hydrogen groups crosslinked with various amino-1,3,5-triazine derivatives. Most notable among the amino-1,3,5-triazine derivatives are the aminoplasts, such as the alkoxymethyl derivatives of melamine and guanamine, which in many respects provide various excellent results, but their The disadvantages are the release of formaldehyde as a volatile by-product under curing conditions and the need for relatively high temperatures to be sufficient to crosslink the film. [0003] Despite the excellent coating fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/02C08G12/12C08G12/38C08G12/42C08L61/32C09D161/32
CPCC08G12/02C08G12/12C08G12/38C08G12/42C08L61/32C09D161/32
Inventor L-T·W·林W·雅各布斯三世
Owner ALLNEX NETHERLANDS BV