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2005•Journal of Building MaterialsRequires access

Synthesis of Blocked Polyisocyanates

Yan Li

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Abstract

Blocked polyisocyanates with low release temperature(110～120 ℃) were synthesized with methyl ethyl ketoxime as blocking agent.The effects of the mole ratio,reacting temperature and time on blocking reaction for prepolymer were studied.The release reaction of blocked prepolymer are discussed and release temperature are determined.The IR spectra for prepolymer,blocked prepolymer and blocked prepolymer release by heating are compared.

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What this paper is about

Blocked polyisocyanates with low release temperature(110～120 ℃) were synthesized with methyl ethyl ketoxime as blocking agent.The effects of the mole ratio,reacting temperature and time on blocking reaction for prepolymer were studied.The release reaction of blocked prepolymer are discussed and release temperature are determined.The IR spectra for prepolymer,blocked prepolymer and blocked prepolymer release by heating are compared.

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Available abstract

Blocked polyisocyanates with low release temperature(110～120 ℃) were synthesized with methyl ethyl ketoxime as blocking agent.The effects of the mole ratio,reacting temperature and time on blocking reaction for prepolymer were studied.The release reaction of blocked prepolymer are discussed and release temperature are determined.The IR spectra for prepolymer,blocked prepolymer and blocked prepolymer release by heating are compared.

Key concepts: Prepolymer, Materials science, Blocking (statistics), Polymer chemistry, Chemical engineering, Composite material, Polyurethane, Engineering

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