https://doi.org/10.15255/KUI.a.000
Published: Kem. Ind. 50 (12) (2001) 677–684
Paper reference number: n/a
Paper type: Professional paper
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Synthesis and properties of polymer polyols

J. Sadadinović and V. Rek

Abstract

The polymer polyols were synthetized from poly(oxypropylene)(oxyethylene) triol with relative molecular mass 5000, styrene monomere (S) and acrylonitrile (AN) with an initiator 2,2'-azo-bis(isobutyronitrile) (AIBN). The influence of polymerization temperature, monomer dosage flow rate, stirring rate of the reaction mixture, initiator fraction, monomer fraction and monomer ratio, ζ_S/AN were investigated and their influence on the reaction course and the propetties of polymer polyols with the fraction of monomer, w = 20, 25, 27 and 30 % and with ratios ζ_S/AN 50/50, 60/40 i 70/30. The optimal synthesis conditions are defined for polymer polyols with defined hydroxyl number, viscosity and stability, as well as for the further application in high resilience cold-molded polyurethane (PUR) foams. The conditions resulting with stabile, low-viscosity polymer polyols are: temperature 115 °C, initiator fraction w = 0.4 and 0.5 % monomer, dosage tlow rate 1.7–2.2 g min^–1 with time of synthesis 3 hours. The basic characteristics of polymer polyols were determined in accordance with the standard ASTM methods. Hydroxyl number, acid number, as well as content of non-reacted styrene and acrylonitrile was determined in accordance with ASTM D-2849-69. Characterization was made by IR-analysis, gel permeation chromatography. Viscosity was determined with Brookfield viscosimeter. The optimal conditions for the synthesis of polyols which ensure the production of stabile and low-viscosity polymer polyols with monomer fraction 20 % and ratios ζ_S/AN = 50/50, 60/40 and 70/30, are defined, and can be applied in the production of high resilience cold-moulded polyurethane foams. In this paper the optimal conditions for the synthesis of polymer polyols with monomer fraction 25 % and ratio ζ_S/AN = 50/50 and 60/40, are defined, and can be applied in the production of high resilience cold-moulded polyurethane foams.

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Keywords

polymer polyol, dispersion, stability, synthesis, hydroxyl number, polyurethane