Methods for making and using amino-aldehyde resins

摘要

Methods for making and using amino-aldehyde resins. The method for making an amino-aldehyde resin can include mixing an intermediate amino-aldehyde reaction product having a total aldehyde compound to total amino compound molar ratio ranging from about 1.4:1 to about 3:1 with a first aldehyde compound and a first amino compound to produce an amino-aldehyde resin having a total aldehyde compound to total amino compound molar ratio ranging from about 0.5:1 to about 1.2:1. The concentration of the first aldehyde compound mixed with the intermediate reaction product can be about 1.9 wt % or more based on a combined solids weight of the aldehyde compounds and the amino compounds in the amino-aldehyde resin.

主权项

1. A method for making an amino-aldehyde resin, comprising:
mixing an intermediate amino-aldehyde reaction product having a total aldehyde compound to total amino compound molar ratio ranging from about 1.4:1 to about 3:1 with a first aldehyde compound and a first amino compound to produce an amino-aldehyde resin having a total aldehyde compound to total amino compound molar ratio ranging from about 0.5:1 to 1:1,wherein:
the intermediate amino-aldehyde reaction product comprises a urea-formaldehyde resin,the first aldehyde compound comprises formaldehyde,the first amino compound comprises urea,the concentration of the first aldehyde compound in the amino-aldehyde resin is about 1.9 wt % or more based on a combined solids weight of the aldehyde compounds and the amino compounds in the amino-aldehyde resin,the concentration of the first aldehyde compound in the amino-aldehyde resin is at least 21 wt % to about 40 wt %, based on the solids weight of the aldehyde compounds in the amino-aldehyde resin, andthe intermediate amino-aldehyde reaction product is at a temperature of about 85° C. or less and a pH of about 7.5 or more when the first aldehyde compound and the first amino compound are mixed therewith.