Influência de catalisador amínico trietilenodiamina 33% nas propriedades de blocos de espuma de poliuretano em uma indústria de bojos

Abstract

The company Delfa Indústria e Comércio de Garment Accessories was the precursor in the manufacture of high performance polyurethane foams for bulge. In recent months, a high rate of nonconformity of blocks of polyurethane foams caused by racks has been observed in Delfa. It was found that during the manufacture of the blocks, the possible cause of the problems could be caused by excess amine catalyst, however, the influence of the same is unknown, since its determination in the formulation is quantified by a purely empirical relation, and there is no mathematical equation to find an adequate value. Therefore, the objective of this work is to identify the influence of amine catalyst on the 35 kg / m³ foam block formulation, which represents about sixty percent of the monthly production, identifying how the 33% triethylenediamine used influences the formulation under analysis, and how it interferes with the incidence of cracks and foam quality standards in the company (height and relaxation). During the foam formation reaction, the measure used to measure the reactivity and speed of the reactions is the time of the cream, which is the time at which the formed carbonic gas and / or the auxiliary blowing agents diffuses into the small original cores of air, giving the mixture a creamy appearance. Cream time is an important feature of a formulation and is influenced by a number of factors, one of which is the level of catalyst. Soon, the range of time sufficient for the mixture to spread well, fill the entire bottom of the crate, stabilize, cremate and initiate growth evenly and evenly will be analyzed. In order to analyze the influence of TEDA, the experiments were carried out in a cylindrical box with a diameter of seventy centimeters, in which the catalyst amount was varied from 0.00 to 0.75 parts. All results are based on an average raw material temperature of 28.0 ° C. The optimal ranges of TEDA, 0.06 to 0.35 parts of polyol were found, as well as the bands of height, 52 and 53 centimeters, of relaxation, in the range of 4 to 7 centimeters and cream time, in the range of 10 to 14 seconds. The cause of the cracks caused by the Delfa company does not originate from excess amine catalyst, since, to be considered in excess, it would have to be in a range greater than 0.70 parts. In the standard formulation used in the company, the TEDA range is in the range of 0.05 and 0.10 parts.