SU874728A1 - Composition for producing phenolformaldehyde porous plastic material - Google Patents

Description

(54) COMPOSITION FOR PREPARING PHENOLFORMALDEHYDE

FOAM

one

The invention relates to polymeric building materials, in particular to phenol formaldehyde penplasts, which are widely used in heat insulation and construction.

Compositions are known for the preparation of foams based on rezol type phenol-resin aldehyde resins, for example, FL-grade foams, consisting of 100 wt. including phenol-formaldehyde resin brand VILM-B with additives 4 wt. including surfactants .OP-7 and 0.5 weight. including aluminum powder PAK-4, foamed and cured acid catalyst of 5 wt. h. contact Petrova, 3 wt. including hydrochloric acid and 1 wt. h., urea Clj.

However, such compositions are multi-component, the process of making foams from them is complicated, and the properties of the finished foam are adjustable | Coz only its bulk weight.

Closest to the present invention is a composition for the preparation of phenol-formaldehyde foam, comprising a phenol-formaldehyde resin of the resolar type and a foaming-from-. vervaggadiy age, nt G23.

The disadvantages of the known composition are the uneven structure and

high wetting of the material obtained, a significant rate of foaming with a large release of toxic gases into the environment, which makes it difficult to use foam plastic when performing certain types of thermal insulation works.

The purpose of the invention is to improve the strength properties of the foam, to reduce the release of toxic gases during foaming, and to regulate the rate of foaming.

This goal is achieved by the fact that the composition, which includes a phenol-formaldehyde hydrosol of a resole type and a foaming-curing agent, additionally contains an aqueous solution of sodium abiettate in the following ratio of components, wt. including:

20 Fe nolformalde hydn a

100 Resin Resin Type Foaming Curing Agent 20-33

An aqueous solution of sodium abieutatate (on a dry basis) of 0.45-3.0. An aqueous solution of sodium abiettate is an abietic resin saponified with 40% NaOH solution,

Avienite resin is a technical product manufactured according to TU-81-05-75-74.

As a resole-type phenol-formaldehyde resin in the composition, aqueous solutions of phenol and formaldehyde co-condensation products are used. With the addition of a surfactant and aluminum powder (FRV-1A resin) or aqueous solutions of phenol and formaldehyde co-condensation products in a mixture with methyl allose with surface additives. -active substances and aluminum powder (Resocel resin).

The co-condensation products of sulfophenylurea with formaldehyde and phosphoric acid (product VAG-3) are used as a foaming curing agent.

The composition is prepared as follows.

Prepare an aqueous solution of sodium abietta of the desired ion concentration. The required amount of an aqueous solution of 10-40% Phenol-formaldehyde resolar resin FRV-1A is added to the calculated amount of phenol-formaldehyde resol resin required to fill the mold or structure heated to 30 + 5 ° C

Aqueous solution of sodium abietta (in terms of dry substance) Foaming agent-curing agent VAG-3

Duration of foaming, with

Cure time, s

l

Bulk weight, kg / m

Durability at 10% compression, kgf / cm

(Water supply for 24 hours,% vol. 2411

the concentration of sodium abietta and mix thoroughly. Then the foaming-hardening agent VAG-3 is introduced into the mixture, stirred for 10-30 s and poured into the prepared form or structure, where subsequent foaming and curing of the foam occurs.

To obtain phenol-formaldehyde foam composition tested, the composition of which is given in table. one.

Characteristics of foams obtained from the known and proposed compositions are given in table. 2

 In this way, the introduction of an aqueous solution of sodium abietta blocks the foaming agent, which leads to an increase in the starting time and the duration of foaming - foam while reducing the release of toxic products into the environment. As a result, an improved quality foam is obtained, as compared with the known one, with a more uniform CTDVK pattern, without shells and cavities, which is especially valuable in the manufacture of thermal insulation products and structures. ,

Table

100

100

100

0.45 1.1

33

25

20

Table 2

45

130

55

0.751.0

0,50,7

15

Claims (2)

1. Krasheninnikov A.N. Monolithic thermal insulation of cellular concrete and plastics. Stroyizdat, L., 1971, with. ten. 2. Authors certificate USSR 233898, st. C 08J 9/02, 1966 (prototype).