US6258310 * Mar 18, 1999 Jul 10, 2001 Basf Corporation Forming isocyanate-terminated prepolymer by reacting polyisocyanate with polyesterpolyol or polyether polyol or mixtrues; introducing into extruder; reacting prepolymer with polyurethane to form crosslinked polyurethane...
The reaction leads to obtain a unique polyurethane prepolymer composed of polyether or polyester soft segments (SS) and diisocyanate-based hard segments (HS). If the molar ratio of diisocyanate to polyol is above (i.e. 2:1), the resultant product is called a quasi-prepolymers or semi-...
The invention relates to a process for producing an isocyanate group-terminated urethane prepolymer which comprises reacting a polyol with a polyisocyanate compound, wherein the polyols comprise 10 to 60% by mass of a polyester polyol and 90 to 40% by mass of a polycarbonate polyol and a ...
5) isocyanate prepolymer 异氰酸酯预聚物 1. Method of lowering content of free TDI in polyisocyanate prepolymer is introduced. 介绍了降低多异氰酸酯预聚物中游离TDI含量的方法,以及我国当前的技术状况,并就发展方向提出了建议。 更多例句>> 6) isocyanate terminated polyethers 端异氰酸酯聚醚...
9.Study on Reaction Kinetics of Curing Agent Synthesis of Diisocyanate Terminated Polyester Polyol二异氰酸酯封端聚酯多元醇型固化剂合成反应动力学的研究 10.Graft Modification of Hyperbranched Polyesteramides with Blocked Isocyanates and It's Application封端异氰酸酯对超支化聚(酰胺—酯)的接枝改性及其应用 11...
PREPOLYMER COMPOSITION for from 5 to 25 minutes storage-stable casting compositions comprising isocyanate - terminated polyester, polyether, polysulphide or polybutadiene polyol prepolymers in admixture with melamine and/or dicyandiamide. Examples describe the ... EUGENE R. BERTOZZI 被引量: 13发表: 1972...
A tertiary amine such as triethylamine is then added to the isocyanate-terminated prepolymer (containing carboxylic acid groups). The tertiary amine reacts with the pendant carboxylic acid groups, forming a carboxylic acid salt. The presence of this salt, together with adequate stirring, allows the...
diisocyanate (IPDI) to get an isocyanate-terminated hybrid polyurethane prepolymer that was cured under atmospheric moisture to get the desired coating films... S Allauddin,R Narayan,KVSN Raju - 《Acs Sustainable Chemistry & Engineering》 被引量: 60发表: 2013年 Preparation and characterization of ...
but joint strength is lower than polyester-based urethanes. Shear strengths fall with increasing temperature; upper temperature limits are less than 250°C (482°F) and more commonly around 150°C (302°F). Peel strength either falls slowly with increasing temperature or peaks, then decreases. ...
(part A) comprising the reaction product of at least one alkylene diol at least one diol; containing a pendant aliphatic chain; and at least one dicarboxylic acid; with at least one NCO terminated polyurethane prepolymer (part B) comprising the reaction product of at least one polyether polyol...