SU585189A1 - Composition for preparing foam plastic - Google Patents

Description

(54) COMPOSITION FOR OBTAINING FOAM

U

This invention relates to compositions for the production of resole-type phenol-formaldehyde resin foams used in construction and other industrial foams.

A known chemical position for the preparation of a foam is one that includes a resole-type phenol-formaldehyde resin and an acidic catalyst 1.

However, the foam on the basis of this composition has a relatively low fire resistance and not sufficiently high mechanical strength.

The closest in technical essence to the proposed invention is a known composition for the preparation of a foam, including a rezol-type phenol-formaldehyde resin, an acid catalyst and a flame retardant additive. As a flame retardant additive, the composition contains a fluorinated acid c1MMONIUM

2

 The foam on the basis of this composition has a higher fire resistance compared to the foam on the basis of the composition described, but it is still not sufficiently high for wide use of this foam in construction. Decomposition used in this compo

Ammonium fluoride position promotes pore formation, which leads to a decrease in the bulk density of the foam but its decomposition products reduce the flammability. Obviously, there is an intensive diffusion and removal of gaseous decomposition products (ammonia, hydrogen fluoride and fluorine) from the pores, as a result of which the flammability of the foam increases with time. In addition, during combustion, as well as aging of the foam on the basis of this composition, very toxic decomposition products of ammonium fluoride will be released into the rooms and the environment, which sharply limits the possibility of using foam in residential and industrial construction.

The purpose of the invention is to improve fire resistance and reduce toxicity.

foam plastic.

This is achieved in that the composition comprising a phenol-formaldehyde resin of a resole type, an acid catalyst and a flame retardant additive, contains a boron-containing mineral as a flame retardant additive and additionally contains expanded polystyrene

in the following ratio, wt.%:

Fe n olformal where i id

resin resin

type47,6-65,4

Sour catalyst 9.5-13.0 Boron content

mineral2-28-28

Polystyrene Foam14, 3 -19.6 As a boron-containing mineral, the composition may contain Asharite 4, VD10H) OH, ulexite HqCa B50jOH) J-5H inoit, colemanite, and other boron-containing minerals or mixtures thereof. Phenol formaldehyde 60, 6 55.6 47.6 per resin. 65.4 Kisly catalyst VLG-Z 13.0 12.1 11.0 9.5 Foamed poly18, 2 16.7 14.3 styrene19.6 Boron-containing mineral: 9.1 16.7 28.6 hilarite 2.0 inoit ulexite colemanite VAG-3 is a condensation product of phosphoric acid. Bulk density, kg / m 77 82 94 112 Compressive strength at 100% linear strain, kgf / cm2 2.0 1.9 1.2 1.2

Example. In all examples, the preparation of the composition and its processing into foam is carried out as follows.

The boron-containing mineral is thoroughly mixed with a curing catalyst, phenol-formaldehyde resin and pre-foamed polystyrene, the resulting composition is placed: a perforated duralumin form 1; and. The foam is formed in a thermostatically controlled oven at 120 ° C for 30 minutes.

The compositions are given in

tab. 1, and the properties of the foams obtained on their basis in table. 2

Table 1 62.4 60.0 62.4 60.0 62.4 60.0 12.5 12.0 12.5 12.0 12.5 12.0 19.4 18.6 19.4 18.6 19.4 18.6 5.7, 4 - 5, 7 9.4 5.7 9.4 sulfophenylureas with formaldehyde and orthoTable 2 93 60 86 90 68 83 2.0 0.5 1.4 1.6 1, 1, 4 0.7 Strength at static bending, kgf / cm 4.8 3.2 2.7 2.9

Weight loss,%

(by the method

Claims (2)

fire tube) 3.0 3.4 1.7 0.8 7 7 Weight loss (the defining combustibility of the foam, obtained on the basis of a known composition with a bulk weight of 17-45 kg / mass, is 11.6-14.1%. Thus, on the basis of the proposed composition, foam is obtained with high fire resistance (a category of difficult-to-combustible materials) and good mechanical strength. In addition, the boron-containing mineral does not contain toxic substances, which can be released both during decomposition of the foam and during its preparation. in the combustion zone of the boron-containing mineral are formed Non-twisted substances: water, oxides of boron, manganese, sodium, which are good adsorbents of organic radicals and, by binding them, reduce the flammability and toxicity of the foam. Formula of the invention Composition for the preparation of foam plastic, including phenol-formaldehyde Continued table. 2 11 11 13 5.0 1.4 2.8 3.0 2.5 0.7 Resin-type resin, acid catalyst and flame-retardant additive, so that, in order to increase the fire resistance and reduce the toxicity of the final product , as a flame retardant additive, it contains a boron-containing mineral and additionally expanded polystyrene in the following ratio of components, weight,%: Phenol-formaldehyde resin of resole type 47.6-65.4 Acidic catalyst 9.5-13.0 Boron-containing mineral 2.0-28.6 Foamed polystyrene 14.3-19.6 Sources of information taken into account during the examination: 1. Vorobiev V. A. , Andrianov R. A. Polymer Thermal Insulation Materials. M., Literature on construction, 1972, p. 215-222. 2. For all 2152643, cl. From 08 T 9/06, 1975, according to which the decision to issue the author's certificate was made (prototype).