One-component, ambient curable waterborne coating compositions, related methods and coated substrates
A technology for water-based coatings and compositions, applied to the field of environmentally curable water-based coating compositions, single-component, and preparation of these coating compositions, which can solve problems such as insufficient storage stability
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[0064] Examples of suitable solvents are polar water-miscible solvents used in the preparation of polycarbodiimides, such as N-methylpyrrolidone. Additional solvents may be added, such as N-methylpyrrolidone, and various ketones and esters, such as methyl isobutyl ketone, and butyl acetate. When present, the organic solvent is sometimes present in an amount of 5 to 25 wt%, based on the total weight of the coating composition.
[0065] The coating composition of the present invention can be prepared by any method known to those of ordinary skill in the art using the above components as raw materials. Suitable methods are described in the Examples of this application. In certain embodiments, the composition is prepared by combining an aqueous dispersion of polycarbodiimide and an aqueous dispersion of a base-neutralized carboxylic acid-functional polymer, wherein the aqueous polycarbodiimide dispersion The pH is greater than 7.0, such as at least 8.0, or in some cases at least...
Embodiment 1
[0081] Aqueous polycarbodiimide dispersions were prepared using the procedure described below and the ingredients and amounts listed in Table 1.
[0082] Table 1
[0083] Element
parts by weight
Charge #1
Desmodur W 1
140
Phospholene oxide
0.7
Charge #2
0.01
Charge #3
85
Charge #4
Ethylene glycol
4.4
Charge #5
Jeffamine M1000 (XTJ-506) 2
123.2
Charge #6
Deionized water
460
Abex 2005 3
16.7
[0084] 1 Methylene-bis-(4-cyclohexyl diisocyanate) from Bayer MaterialsScience, LLC.
[0085] 2 Polyetheramine from Huntsman (EO / PO molar ratio=6.3, MW=1000)
[0086] 3 Anionic surfactant from Rhodia
[0087] Charge #1 was added to a 2-liter, 4-neck flask equipped with a motor-driven...
Embodiment 2
[0089] Aqueous polycarbodiimide dispersions were prepared using the procedure below and the ingredients and amounts listed in Table 2.
[0090] Table 2
[0091] Element
parts by weight
Charge #1
TMXDI 1
280
cyclophosphene oxide
4.2
Charge #2
0.024
Charge #3
85
Charge #4
Ethylene glycol
8.4
Charge #5
Jeffamine M1000 (XTJ-506) 2
244.2
Charge #6
Deionized water
960
Abex 2005 3
33.3
[0092] 1 m-tetramethylxylene diisocyanate available from Cytec Industries Inc.
[0093] 2 Polyetheramine from Huntsman (EO / PO molar ratio=6.3, MW=1000)
[0094] 4 Anionic surfactant from Rhodia
[0095] Charge #1 was added to a 2-liter, 4-neck flask equipped with a motor-driven stainless steel...
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