Chemistry and Technology of Polyols for Polyurethane - download pdf or read online
By Mihail Ionescu
Polyurethanes became probably the most dynamic teams of polymers and so they locate use in approximately each point of recent existence, in functions reminiscent of furnishings, bedding, seating and device panels for vehicles, shoe soles, thermoinsulation, carpet backings, packaging, and as coatings.
The major uncooked fabrics used for the construction of polyurethanes are polyols, isocyanates and propylene oxide. the 1st of those is the topic of the most recent Rapra guide: Chemistry and know-how of Polyols for Polyurethanes.
This publication considers the uncooked fabrics used to construct the polyurethane polymeric structure. It covers the chemistry and know-how of oligo-polyol fabrication, the features of many of the oligo-polyol households and the results of the oligo-polyol constitution at the homes of the ensuing polyurethane. It provides the main points of oligo-polyol synthesis, and explains the chemical and physico-chemical subtleties of oligo-polyol fabrication.
This e-book makes an attempt to hyperlink information and data about the chemistry and know-how of oligo-polyols for polyurethanes, delivering a accomplished evaluation of:
This booklet can be of curiosity to all experts operating with polyols for the manufacture of polyurethanes and to all researchers that will prefer to recognize extra approximately polyol chemistry.
Read Online or Download Chemistry and Technology of Polyols for Polyurethane PDF
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Extra info for Chemistry and Technology of Polyols for Polyurethane
Is made before foaming. Then it is possible to use only two components: one is the polyolic component (called component A or formulated polyol, containing a mixture of all raw materials except for the isocyanate, in the proportions needed) and the second component is the isocyanate (called component B or isocyanate component). The polyurethane that results is a consequence of the very efficient contact between the isocyanate component and the polyolic component. Usually, in rigid PU foams only two components are used.
2) A special case is the reaction of an isocyanate group with formic acid. One mol of formic acid generates two mols of gases: one mol of carbon dioxide and one mol of carbon monoxide. 2). Isocyanates have some important reactions without the participation of active hydrogen compounds. These reactions, of real importance in polyurethane chemistry are: dimerisation, trimerisation, formation of carbodiimides and reaction with epoxides and cyclic anhydrides. , potassium acetate, tris [dimethylaminomethyl] phenol and others), with the formation of heterocyclic isocyanurate compounds [1, 3, 12, 13, 15, 23-25].
43 OH groups/mol. +x1*f1 In practice mixtures are frequently obtained between oligo-polyols of different functionalities, for example octol with triol or hexol with triol. 5. 4 if the functionality (f) and the hydroxyl number (OH#) are known, in fact it is a particular case of MW determination by the quantitative analysis of the terminal functional groups, in our case the hydroxyl groups. Thus, a triol with an OH# of 27 mg KOH/g has a calculated MW of 6,233 daltons, but a tetraol having the same OH#, has a calculated MW of 8,311 daltons.
Chemistry and Technology of Polyols for Polyurethane by Mihail Ionescu