SU914583A1 - Composition for producing foamed plastic - Google Patents

Description

The invention relates to polymeric compositions that can be used to obtain insulating materials.

Known composition for the foam, including urea resin, hardener, a foaming agent and a filler [1].

The disadvantage of the foam obtained on the basis of this composition is low strength.

Closest to the proposed technical essence is a composition for the preparation of foam, including a urea-formaldehyde resin, loess, a surfactant, water and an acid hardener [2].

However, the foam obtained on the basis of this composition is characterized by increased brittleness and low resistance to water.

The aim of the invention is to improve the physico-mechanical properties of the final product.

This goal is achieved by the fact that the composition to obtain a foam, including 2

urea-formaldehyde resin, loess, surfactant, water and acid hardener, additionally contains an aqueous dispersion of rubber at a ratio of components, weight. h

PO urinary formaldehyde resin — 160

Surfactant (OP — 10) 2-5

Less 30-70

Water 10—15

Water dispersion rubber

(15-20% concentration) 2-8

Acid hardener (10–20% solution of sulfuric acid) 30–50

The process of making foam is mixing urea-formaldehyde resin and loess, introducing a mixture of aqueous rubber dispersion into the mixture. Together with the dispersion, a surfactant (OP-10) is introduced — a product of the treatment of monophenols with ethylene dialkyl alumina.

The resulting mass is mixed in

15-20 minutes until smooth, then by ejection in

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sulfuric acid solution The mixture is intensively stirred for 2 minutes. The resulting foamed mass is poured into the mold, where it cures and dries.

In tab. 1 shows the optimal and limiting compositions of the proposed insulating material.

The physicomechanical parameters of the heat-insulating material are given in table. 2

As can be seen from the table. 2, the foam obtained from the proposed composition increases compressive strength, decreases water absorption, and brittleness decreases.

and increases frost resistance.

Table 1

Components Component content, parts by weight one 2 3 Urea formaldehyde resin 110 1b0 135 Loess 70 zo 50 Surfactant (OP-10) 2 five 3 Water 15 ten 12 Water dispersion rubber 2 eight five Sulfuric acid 15% concentration thirty 50 40

table 2

Indicators Known composition The proposed composition one 2 3 one 2 3 Volume weight, kg / m ^ 185 sic 220 170 290 195 Compressive strength, kg / cm ² 12 28 21 · 15 35 thirty Coefficient heat conductor kcali 0.032 0.05 0.047 oh oz 0.038 0.04 m · trade'ch Water absorption by volume,% 36 28 32 15 ten 12 Water absorption in 24 h kg / m ² 1.0 1.2 0.8 0.5 0.6 0.4 Operating temperature, ° С 190 100 100 100 100 100 Compression deformation limit, mm / m 0.9 0.8 1.0 3 eight five Frost resistance, ° C ten 15 13 20 25 25

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Claims (1)

Claim Composition to obtain foam, including urea-formaldehyde resin, loess, surfactant, water and acid hardener, characterized in that, in order to improve the physical and mechanical properties of the final product, it additionally contains a water dispersion of rubber in the following ratio of components, weight. b .: yu Urea formaldehyde PO resin — 160 Less 30-70 Surfactant2-5 Water 10-15 Acid Hardener 30-50 Water dispersion rubber (15 —'20 ⁰ / oh concentration). 2-8