SU690032A1 - Method of preparing polyoxyalkyleneorganosiloxane blockcopolymers - Google Patents

Description

(54) COMPOSITION FOR GETTING POLYURETHANE FOAM Isocyanate 49.0-62.0 Oxypropylated ethylenediamine19.0-29.0 Surfactant 0.6-0.8 Foaming agent1.8-11.3 Dose Ethylene Ethylene Diphene Glycol 6, 5-21.0 . The use in the formulation of only oxypropane clonidine (Lapromol - 294 having a high viscosity (140-150 thousand sP at 25 ° C) makes mixing difficult and does not allow to obtain a foam with improved properties. The use of diethylene glycol (fosdiol) in the composition also having a low viscosity (450- 470 cP) makes it possible to reduce the viscosity of the whole mixture, to obtain a foam with the desired strength properties and to introduce into the composition of polyurethane foam an extinguishing element - phosphorus. Active ingredient - phosphorus The use of polyester (instead of inert trichloroethyl phosphate) also increases the heat content of the foam.Thus, the introduction of azo containing and phosphorus-containing polyether polystyrene in the composition makes it possible to obtain polyurethane foams with high MI Strength characteristics and heat resistance, low fuel consumption without the use of toxic catalysts. can be carried out as follows: two working mixtures - polyester, consisting of Lapromol - 294, fosdiol, surface-active About the substance and blowing agent, and the isocyanate is poured into the tanks of the filling machine intended for them, from where they are pumped to the mixing head. In the mixing head, the composition is intensively mixed and poured into a mold, where it foams and cures. As an isocyanate, any isocyanate with two or more active HCl groups, for example polyisocyanate, can be used; polysiloxane foam regulators, for example CEP-1, as a foaming agent, boiling liquids, for example Freon-11, can be used as a surfactant. Examples 1-15. In all examples, compositions are prepared and polyurethane foams are prepared based on them, as described above. The compositions of the compositions in wt.% Depending on the volume weight of the resulting polyurethane foam are given in table. 1.3 and 5, and the properties of the resulting polyurethane foam - in the table. 2.4 and 6 (density 0.07; 0.15 and 0.3 g / cm, respectively). , Table 1

Dimesh ethanol 0, 6 amine

0.2

8.4

Strength at compression, kg / cm 13,415,716,125,6

Heat resistance, ° С

140140150175

28323,212,7

175

180180 3115

8262

45 Lapromol-29429,517,421,1 Fosdiol-11,126,521,1 Laprol-263-32,7 ... -Polyisocyanat59, 051,753.0 CEP-10.60.50.9 Freon-II2,13,22,2 Dimethyl ethanolamine-0,6- Dibutyl tin Shcharyat-0,2 62 Destructive and Heat Resistance,. and ° C cracked 150 s. Flammability, self-burning time, s. Relative burning weight loss,%

41

eleven

50

53

72

Table 5

Claims (2)

T a b l and c a. 6 26,228.8 11,27,2 60,061,564,0 0,70,70,7 1,91,8 .1,7 Thus, the strength of polyurethane foam depends on the content of nitrogen and phosphorus containing in the composition of nitrogen polyesters. With an increase in FosdIola content in the composition and, accordingly, a decrease in Lapromol 294, the first increase and then decrease in compressive strength occurs, and the properties of the foams from the composition according to the invention are 30-40% higher than the properties of PUF-308N and 15-20% higher than those of polystyrene by 1. Thermal stability of polystyrene depends on the content of Lapromol - 294. With an increase in its content, heat resistance first increases and then remains almost unchanged. The heat resistance of the foam of the composition according to the invention is 20-30 ° C higher than that of the known compositions. The fire resistance of the foam of the proposed composition in comparison with PPU-308N is significantly higher, as indicated by MeHbUiee, the self-burning time and weight loss during combustion. The lower limit of the content of Lapromol -294 in the composition is 19 wt.%, With a lower content (Example 1), the strength and heat resistance of the foam polyurea deteriorates. The upper limit of the content of Lapromol-294 in the composition is 29 Bes.%, With its higher content (Example 15) there is a decrease in strength and a deterioration in the performance of polystyrene foam. The lower limit of the content of Fosdiol in the composition is equal to 6.5 wt.%, When it decreases (Example 5), the Strength decreases and the flammability index of the foam deteriorates. The upper limit of the content of Fosdiol in the composition is 21 wt.%, With a higher content (Example 1J), the strength and heat resistance of the foam decreases. On the basis of the proposed composition, polyurethane foam is obtained with increased heat resistance and mechanical strength. DETAILED DESCRIPTION OF THE INVENTION Composition for producing polyurethane foam, including isocyanate, oxypropylated ethylenediamine, surfactant and foaming agent, characterized in that, in order to increase the mechanical strength and heat resistance of the final product, it additionally contains ethoxylated diphosphonate diethylene glycol in the following ratio of components, wt. %: Isocyanate 49.0-62.0 Hydroxy alcohol, ethylenediamine, 19.0-29.0 -Surfactant 0.6-0.8 Foaming agent 1.8-11.3 OK sethylated phosphon t diztilenglikol 6 5-21,0 Information sources. taken into account in the examination 1. US patent N ° 3480594, cl. 260-2.5, pub. 1967. 2. PPU-308N. Chemistry and technology foamed plastics. Vladimir, 1970, p. 189 (prototype).