One-component moisture-curable urethane composition and method for producing same
The present technology is to provide a one-part moisture-curable polyurethane composition having excellent adhesion to an adherend (coated plate), and a method for producing such a composition. The present technology is a one-part moisture-curable urethane composition including a preliminary composition obtained by mixing a urethane prepolymer, an aliphatic isocyanate A, and an aminosilane compound B, and a catalyst; and a method for producing such a composition.
1. A one-part moisture-curable urethane composition including:
a preliminary composition obtained by mixing a urethane prepolymer, an aliphatic isocyanate A, and an aminosilane compound B, and
a catalyst, wherein the catalyst contains N, N-dimethylaminoethylmorpholine and products formed by reacting 1,3-diacetoxy-1,1,3,3-tetrabutyl-distannoxane with ethyl silicate in a molar ratio of 1:0.8 to 1.2.
2. The one-part moisture-curable urethane composition according to claim 1 , wherein the urethane prepolymer is obtained by reacting polypropylene glycol with diphenylmethane diisocyanate.
3. The one-part moisture-curable urethane composition according to claim 1 , wherein the aliphatic isocyanate A is at least one type of aliphatic isocyanate-modified product a selected from the group consisting of reaction products of a polyol having tri- or higher functionality and an aliphatic polyisocyanate, allophanates of aliphatic polyisocyanate, isocyanurates of aliphatic polyisocyanate, and biurets of aliphatic polyisocyanate.
4. The one-part moisture-curable urethane composition according to claim 1 , wherein the aminosilane compound B contains, in each molecule, an alkoxysilyl group and a nitrogen atom to which an aromatic ring and a hydrogen atom are bonded.
5. The one-part moisture-curable urethane composition according to claim 4 , wherein the alkoxysilyl group is a methoxysilyl group or an ethoxysilyl group.
6. The one-part moisture-curable urethane composition according to claim 1 , wherein, per 100 parts by weight of the urethane prepolymer,
an amount of the aliphatic isocyanate A is from 0.8 to 10 parts by mass, and
an amount of the aminosilane compound B is from 0.1 to 4 parts by mass.
7. The one-part moisture-curable urethane composition according to claim 1 , wherein the catalyst further contains at least one type selected from the group consisting of dibutyltin acetylacetate, and dimorpholinodiethyl ether.
8. The one-part moisture-curable urethane composition according to claim 7 , wherein the catalyst contains products formed by reacting 1,3-diacetoxy-1,1,3,3-tetrabutyl-distannoxane with ethyl silicate in a molar ratio of 1:0.8 to 1.2,
dibutyltin acetylacetate,
dimorpholinodiethyl ether, and
N, N-dimethylaminoethylmorpholine.
9. The one-part moisture-curable urethane composition according to claim 8 , wherein an amount of the organotin catalyst is from 0.0005 to 0.3 parts by mass per 100 parts by mass of the urethane prepolymer.
10. The one-part moisture-curable urethane composition according to claim 8 , wherein an amount of the dimorpholinodiethyl ether is from 0.004 to 1.2 parts by mass per 100 parts by mass of the urethane prepolymer.
11. The one-part moisture-curable urethane composition according to claim 8 , wherein an amount of the N, N-dimethylaminoethylmorpholine is 1 part by mass or less per 100 parts by mass of the urethane prepolymer.
12. The one-part moisture-curable urethane composition according to claim 1 , wherein the preliminary composition further contains a filler.
13. The one-part moisture-curable urethane composition according to claim 12 , wherein the filler is at least one selected from the group consisting of carbon blacks and white fillers.
14. The one-part moisture-curable urethane composition according to claim 1 , wherein the preliminary composition further contains a plasticizer.
15. A method for producing a one-part moisture-curable urethane composition, the method comprising:
a mixing step 1 of obtaining a preliminary composition by mixing a urethane prepolymer, an aliphatic isocyanate A, and an aminosilane compound B; and
a mixing step 2 of producing the one-part moisture-curable urethane composition described in claim 1 by mixing the preliminary composition and a catalyst.
16. The method for producing a one-part moisture-curable urethane composition according to claim 15 , wherein at least one selected from the group consisting of fillers and plasticizers is further used in the mixing step 1.
17. The one-part moisture-curable urethane composition according to claim 4 , wherein the alkoxysilyl group is an ethoxysilyl group.