SU757559A1 - Composition for producing porous plastic material - Google Patents

Description

This invention relates to compositions for the production of foams based on phenol-formaldehyde resin of the aeol type used as heat insulation materials in construction.

A known composition for the preparation of polystyrene, comprising a phenol-formaldehyde resin of a resol-type, a θ-surfactant, aluminum powder, a foaming curing agent and caprolactam [1].

The use of caprolactam in the composition contributes to an increase in the physicomechanical parameters of the foam produced.

However, this increases the toxicity of the composition, the cost of foam. 2θ

In addition, there is a need for the placement of additional equipment for the storage and dosing of additives.

The closest to the technical essence of 25 to this selection is a well-known composition for the preparation of foam, including a rezol-type phenol-formaldehyde resin, surfactant, aluminum2

niyu powder and foaming curing agent [2].

The disadvantage of this composition is low compressive strength and relatively high water absorption of the foam on its basis.

The aim of the present invention is to improve the physico-mechanical properties of the foam.

This is achieved by the fact that the composition for producing foam plastic, including resole-type phenol-formaldehyde resin, surfactant, aluminum powder and foaming-curing agent, contains as a phenol-formaldehyde resin resin-type resin weight.%: .

Phenol 3-15 Cumylphenol Acetophenone and 5-25 dimethylphenyl carbinol Dimers- <£ -me- 5-25 tilstirol 15-40 Other mash Rest

3

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in the following ratio of components, parts:

69.0-81.0

five

2.4-8.3

0.4-1.8

ten

14.0-25.0

Phenol-formaldehyde resin of the rheol-type surfactant

Aluminum powder

Foaming agent

The main modifying component of the residue is cumylphenol. It belongs to bifunctional compounds and, upon 15 interaction with formaldehyde, forms resin of a linear structure.

In addition, dimers of-methylstyrene form with phenol the so-called complex phenol, which has two active points in ortho positions.

Complex phenol also reacts with formaldehyde to form gums of branched structure.

25

All components of the residue have good hydrophobicity. The introduction of the modifying residue of phenol production by the cumene method allows-. em to get a phenol-formaldehyde resin rezol type with a large 30

dry matter content at a relatively low viscosity of the product.

Properties of the modified phenol formaldehyde resin are given in 35.

tab. one.

Table 1

Characteristics of a modified phenol-formaldehyde resin

Name of the indicator Magnitude indicator 45 one 2 The rate of foaming 18-35 Induction period during foaming, s 100-300 50 Viscosity according to gepler at 20 ^σ 6, cP 500-3500

Continued table. one

d ---- one 12 Content dry balance% 78-85 Content free phenol,% 7-10

Nonionic surfactants are used as surfactants, for example, OP-7 or OP-10 (a mixture of polyethylene esters of mono- and dialkylphenols).

The product VAG-3 obtained by condensation of sulfophenol urea with formaldehyde in a mixture with phosphoric acid is used as a foaming agent.

Examples 1-3. For the preparation of compositions, the following components are loaded into a mixer equipped with a mixer: liquid modified phenol-formaldehyde resin of the resol system (dry content 78-80%), product OP-7, aluminum powder. The mixture is stirred for 30 seconds, then the product VAG-3 is added.

The compositions of the compositions (in parts) are given in table. 2

table 2

Components of the composition one 2 3 Modified phenol formaldehyde resin rezol type 69 75 81 Surfactant OP-7 4.2 8.3 2.4 Aluminum powder 0.8 0.4 1.8 Product VAG-3 23 16.3

After stirring at room temperature for 30 seconds, the mixture is poured into a mold, where foaming and curing occurs.

Comparative characteristics of heat-insulating plates, obtained on the basis of the composition according to the invention, are given in table. 3

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T a b and c a 3 The name of indicators Styrofoam based compositions for ^ 2] Foam plastic for example one 2 3 Volume weight, kg / cm -2 Strength, kg / cm: 60-100 60 80 jur under compression. 0.8-1.7 1.5 2.0 2.8 bending - - - 8-10 Water absorption (24 h, 100-ny relative humidity), wt.% 18-25 14 ten ί ( eight

Thus, on the basis of the composition according to the invention, a foam is obtained with enhanced physical and mechanical properties as compared with the foam based on the composition according to [2].

In addition, the cost of phenol-formaldehyde resin is reduced, and, consequently, the cost of foam based on it due to the replacement of part of the resin with bottom residue.

Claims (1)

Claim Composition for producing foam, including phenol-formaldehyde resin rezol type, surfactant, aluminum powder and foaming-curing agent, characterized in that, in order to improve the physico-mechanical parameters of the foam, as a phenol-formaldehyde resin rezol type it contains a resin, a modified vat residue phenol by the molar method consisting of, wt.%: Phenol 3-15 Cumylphenol 5-25 20 Acetophenone and dimethylphenylcarbinol 'Dimers οί -me 5-25 tilstirol 15-40 25 Other applications si Rest with the following ratio weight: Phenol formaldehyde resin rezol type 69.0-81.0 Surface active substance property 2.4-8.3 Aluminum powder 0.4-1.8 Foaming curing agent 14.0-25.0