引用本文:
Qing Ye ZHOU, Han LI, Mou Dao SONG, Bang Hua ZHANG, Bing Lin HE. SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE LATEX[J]. Chinese Chemical Letters,
1996, 7(4): 375-376.
Citation: Qing Ye ZHOU, Han LI, Mou Dao SONG, Bang Hua ZHANG, Bing Lin HE. SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE LATEX[J]. Chinese Chemical Letters, 1996, 7(4): 375-376.
Citation: Qing Ye ZHOU, Han LI, Mou Dao SONG, Bang Hua ZHANG, Bing Lin HE. SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE LATEX[J]. Chinese Chemical Letters, 1996, 7(4): 375-376.
SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE LATEX
摘要:
A method of preparing stable,film-forming polyurethane latices without the use of emulsifying agents is described in this article.The reaction of polypropylene glycol with a stoichiometric ratio (NCO:OH=2:1) of tolylene-diisocyanate in the presence of ketones and catalyst produces an isocyanate terminated prepolymer.Then addition of diethylene glycol as chain extender to prepolymer solution can yield a relatively high molecular weight poly (urethane-ether) which is readily dispersed with aqueous tartaric acid after tartaric acid and water diffuse into the suspended globules of the latex and produces the chain extended urethane.A linear or crosslinked high molecular weight self-emulsifiable polyurcthane can be obtained due to the reaction of the hydroxy group of tartaric acid and little water with isocyanate endgroups.The results of FTIR also show that an expected polyurethane emulsion has been successfully synthesized.
English
SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE LATEX
Abstract:
A method of preparing stable,film-forming polyurethane latices without the use of emulsifying agents is described in this article.The reaction of polypropylene glycol with a stoichiometric ratio (NCO:OH=2:1) of tolylene-diisocyanate in the presence of ketones and catalyst produces an isocyanate terminated prepolymer.Then addition of diethylene glycol as chain extender to prepolymer solution can yield a relatively high molecular weight poly (urethane-ether) which is readily dispersed with aqueous tartaric acid after tartaric acid and water diffuse into the suspended globules of the latex and produces the chain extended urethane.A linear or crosslinked high molecular weight self-emulsifiable polyurcthane can be obtained due to the reaction of the hydroxy group of tartaric acid and little water with isocyanate endgroups.The results of FTIR also show that an expected polyurethane emulsion has been successfully synthesized.
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