SU696032A1 - Composition for preparing porous polyurethan - Google Patents

Description

(54) COMPOSITION FOR PREPARING OF POLYURETHANE FOAM

Isocyanate49.0-62.0

Oxypropylated

ethylenediamine19.0-29.0

Surface active

substance0,6-0,8

Special agent1,8-11,3

Ethoxylated

Diethylene glycol diphosphonate 6, 5-21.0.

The use in the formulation of only oxypropylated ztilenediamine (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 also ethoxylated diphosphonate diethylene glycol (fosdiol) having a low viscosity (450- 470 cP) in the composition makes it possible to reduce the viscosity of the whole mixture, to obtain a foam with improved strength properties and to introduce a fire-fighting element — phosphorus — into the composition of the polyurethane foam.

The active component - phosphorus-containing polyester (instead of inert trichloroethyl phosphate) also provides an increase in the heat resistance of the foam.

Thus, the introduction of azo-containing and phosphorus-containing polyelectric agents into composites makes it possible to obtain polyurethane foams with high strength characteristics and heat resistance, low flammability without the use of toxic catalysts.

The preparation of polyurethane foam from the composition according to the inventor can be carried out as follows: two working mixtures — polyester, consisting of Lapromol — 294, fosdiol surfactant and foaming agent, and isocyanate are poured into the tanks of the filling machine intended for them, from where they are pumped to mixing head. In the mixing head, the composition is vigorously agitated and poured into a form of Nfy, where it foams and hardens.

Any isocyanate with two or more active NCOrrp} TmaMH, for example a polyisocyanate, can be used as an isocyanate; polysiloxane foam controllers, for example, CEP, as a foaming agent, light boiling liquids, for example Freon-11, can be used as surfactants.

Examples 1-15.

In all examples, compositions are prepared and polyurethane foams based on them are prepared 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 0.3 g / cm corresponding to 6 (a density of 0.07; 0.15 is valid).

Table 1

Dimethyl ethanol, 6. amine

0.2

8.4 Compressive strength limit, kg / cm 13,415,716,125,6 Heat resistance, ° С 28,323,2

Combustibility

independent burning time, with

slough

time of self grief

Relative weight loss

35

57

burning%

41

eleven

35

36

41

68

Claims (2)

37 Thus, the strength of polyurethane foam depends on the content of nitrogen and phosphorus-containing polyesters in the composition. With an increase in the content of Fosdiol in the composition and, accordingly, a decrease in Lapromol 294, there first occurs an increase and then a decrease in the compressive strength, 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 foam 1. The heat resistance of the foam depends on the content of Lapromol - 294. With an increase in its content, the 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 evidenced by a shorter time for independent burning 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 are deteriorated. The upper limit of the content of Lapromol-294 in the composition is 29 wt.%; with its greater content (Example 15), the strength decreases and the flammability indexes of foam plastic deteriorate. 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 most of its content (Example 1), 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 A composition for producing polyurethane foam comprising isocyanate, oxypropylated ethylenediamine, a surface-active substance and a foaming agent, from which, in order to increase the mechanical strength and heat resistance of the final product, it additionally contains oxyethylenated diethylene glycol in the following way. wt.%: Isocyanate 49.0-62.0 Hydroxypropane ethylenediamine19.0-29.0 Surfactant0.6-0.8 Foaming agent1.8-11.3 Hydroxyethyl diphosphone diethylene 6 5-21,0 information sources, the received note in the examination № 1. U.S. Patent 3,480,594, cl. 260-2.5, pub. 1967. 2. PPU-308N. Chemistry and technology of foamed plastics. Vladimir, 1970, p. 189 (prototype).