SU566854A1 - Composition for foam plastic production - Google Patents

Description

Isolation refers to compositions for the preparation of foams based on phenol-formaldehyde resins used as a thermal insulation material in construction, shipbuilding, and other industries.

A known composition for the preparation of a foam consisting of a resole-type phenol-formaldehyde resin and a foaming curing agent 1.

However, the foam on the basis of a secret composition has increased moisture absorption and hygroscopicity. In addition, in terms of combustibility, it falls into the category of flame retardancy in the lower yachts.,

The most technically advanced is the composition for making foam, including phenol-formaldehyde grinding resin of the resolvent type, a foaming curing agent and a filler. As an active filler, it contains alumina hydrate.

Foam based on this composition has reduced moisture absorption and flammability, but they are insufficient for use in construction, where non-combustible materials and with low water absorption and hygroscopicity are required.

The aim of the invention is to improve the physico-mechanical properties of the foam, and

namely the reduction of water absorption, hygroscopicity and mountains.

This is achieved by the fact that, as a filler, the composition contains a mixture of calcium oxide hydrate and slag flour with a particle size of 0.08-0.1 mm and consisting of, weight. %:

SiOa54,02-55,34

AlaOs23,72-26,53

RegOz10,84-12,47

FeO5,20-8,24

CaO1.97-2.44

MgO 1.90-2.47

SOs0.32-0.33

in the following ratio of components of the composition, is the weight. %:

Phenol formaldehyde resin rezol

type55-62

Foaming curing

agent 12-18

Hydroxide

calcium 2.5-5

Ashes and slag flour 20-26

The foam on the basis of the proposed composition was prepared as follows.

At an ambient temperature not lower than 20 ° C, a mixture of ash and slag flour powders and calcium oxide hydrate is poured into a mixer with a standard mixer. To them

Phenol-formaldehyde resin (PRF-1A) is added and mixed for 2-3 minutes. Then, an expanding-hardening agent VAG-3 (condensation product of sulfophenyl urea with formaldehyde and orthophosphoric acid) is added and stirred at a speed of 600 o B / min for 15–20 seconds. After that, the mixture is poured into a metal mold. In closed form, due to the exothermic reaction between

Cmola and foaming, e-hardening: W, they agent foaming of the mixture and the formation of foam within 1-2 minutes.

Examples 1--11. Compositions are prepared and foams are prepared on their basis in all examples as described above.

The compositions are presented in table. 1, and properties of the polyfoams received on their basis - in tab. 2

Table 1

Thus, on the basis of the proposed composition, a foam is obtained with a complex of valuable properties — low water absorption, hygroscopicity and flammability, and, as can be seen from the table. 1 and 2, this is achieved by the joint use of ash and slagwater and calcium oxide hydrate. . .

Claims (2)

1.Vorobyov V.A., Andrianov R.A., Polymer Heat Insulation Materials, M., Izdat. construction literature, 1972, p. 219-222. 2. USSR author's certificate No. 349699, cl. From 08J 9/06, 1970.