SU704951A1 - Composition for preparing porous polyurethan - Google Patents

Description

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This invention relates to compositions for the preparation of polyurethane foams used for the manufacture of thermal insulation coatings and filling cavities in the preparation of various simple and figured products.

A known composition for the preparation of polyurethane foam comprising an isocyanate, a hydroxyl-containing compound, a foam stabilizer, a foaming agent, and water. The hydroxyl-containing compound — a graft copolymer of polyoxy-shkylene polyol and vinyl monomers j containing a tertiary nitrogen atom — is simultaneously catalyst 1..

The disadvantage of this composition is the high toxicity of the used catcher, the high rate of production of polyurethane foam and its insufficiently good physicomechanical properties.

The closest to the technical essence of this invention is a known composition for the preparation of polyurethane foam, including priso-cyanate, a simple hydroxyl-chloro-containing polyester, oxypropylated ethylenediamine, a foam stabilizer, fluorotrichloromethane, water, and a catalyst. As a catalyst, the composition contains dimethyl ethanol amine 2.

The disadvantage of the composition is the high toxicity of the catalyst used in it - and there is not enough horsch over the physical and mechanical properties of polyurethane foam based on it.

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The purpose of the Invention is to reduce toxicity and improve the physicomechanical properties of polyurethane foam.

This goal is achieved by the fact that

5 a composition comprising a polyisocyanate, a simple hydroxyl-chloro-containing polyester, an oxypropylated ethylene diamine, a foam stabilizer, fluorotrichloromethane, water and a catalyst,

0 as a catalyst contains tetraethylthiuram disulfide in the following ratio of components, parts by weight:

170.0-200.0

Polyisocyanate Simple Hydro5 xylchloro poly poly70, 0-80.0 ether

Oxypropylated these en0

20.0-30.0 Diamine stabilizer .1.0-1.8 Fluorotrichloromethane25, 0-35.0 Water0.5-1.0 Tetraethylthiuram disulfide 0.5-1.0, Tetraethylthiuramdisulfide (thiuram E) is a white powder odorless with a melting point of 108 ° C and has the following chemical structure: NC-icN as a simple hydroxyethyl-containing polyester using ) from the product of the interaction of chloral. with polyether DT-500 (laprol 503M), as a stabilizer block copolymer of polyorganoskloksandi prlioxyethylene-CEP-1, Oxypropylated ethylenediamine has the brand .lapromol-294, fluorotrichloromethane - freon-I. The invention is illustrated by the following examples,.; Example 1. In a polyethylene cup weigh 70 weight.h. Laprol 503 M, 30 weight.h. lapromol 294, 1.3 wt. including CEP-1, 0.5 weight.h. water 25 weight.h. freon-11 and 0.5 weight.h, tiurana E. Then stir the whole mass

The physicomechanical properties of polyurethane foams were woven using a mechanical stirrer (1600 v / m) for 3 minutes until a homogeneous mass was formed, and then 170 parts by weight was added. polyisocyanate; the whole mass is stirred in. for 20 s. and poured into the form where foaming and curing of the foam occurs. Induction time 90 s. foam lift time 300 s. Example 2. Carried out analogously to example 1, but the components are taken in a ratio, weight. Laprol 503M Lapromol 294 1.5, CEP-1 Thiuram E 0.75 1 Freon-11 Polyize.6 cyanate 180 Induction time 100 s, foam rise time 300 with. Example 3. Carried out analogously to examples 1 and 2, but the components are taken in the ratio, weight. H: Laprol 503 M 80 Lapromol 29420. CEP-11.8 Thiuram E. 1 Water1 Freon-1135 Polyisocyanate 200. Induction time 120 s., Foam rise time 300 s. Physical and mechanical properties are shown in the table.

From the data in the table it is seen that with an increase in the amount of tetraethylthiuram disulfide, the physical and mechanical properties of polyurethane foam compositions also improve. So (compared to 2), the compressive strength increases by 3 times, the specific impact strength is 4 times with an almost non-varying volume of weight (data for comparison are taken from example 3).

After reviewing the test results, it can be concluded that tetraethylthiuram disulfide can be used as a curing catalyst.

Foaming boiler position according to the invention occurs more evenly in time. Foam reaches a greater height than the height of the rise of the known composition. Polyurethane foam obtained on. Based on the composition according to the invention, it has a slight shrinkage, low water absorption, good physical and mechanical properties. The introduction of tetraethylthiuramdisulfide and reduces toxicity both in the preparation and use of polyurethane foam,. The induction time increases from 90 s to 120 s, which, in turn, allows the panels to be filled in both simple and complex configurations. Improving the strength properties of polyurethane foam is provided by the chemical interaction of tetraethylthiuram disulfide with polyesters and a polyisocyanate. It combines well with polyesters and polyisocyanates, does not wash out with water and aggressive media. The polyurethane foam of the composition according to the invention can be obtained both by target processing and manually. The recommended chemical substance as a catalyst in its catalyzing effect significantly exceeds the known industrial catalysts for urethane foams, improves the strength properties of polyurethane foam and also reduces toxicity during production and during operation. Formula of the invention Composition for the preparation of polyurethane foam foam including polyisocyanate, simple hydroxyl-chloro-containing polyether, hydroxypropylated ethylene diamine, foam stabilizer, fluorotrichloromethane, water and a catalyst that is such that, in order to reduce toxicity and improve physical and mechanical properties, to improve toxicity and improve physical and mechanical properties. as a catalyst, it contains tetraethylthiuram disulfide in the following ratio / component, weight.H {Polyisocyanate 170.0-200.0 Simple hydroxychloro-containing polyester 70.0-80.0 Oxypropylated Ny Ethylenediamine 20.0-30.0 Foam stabilizer 1.0-1.8 Fluorotrichlormetay 25.0-35.0 0.5-1.0 Tetraethylthiuram disulfide 0.5-1.0. Sources of information, rintye taken into account in the examination of 1, USSR Author's certificate 438666, class, C 08 O 18/14, 1972,; 2, Vakhtin V, G, Turkish fliB.i Filling polyurethane foam of improved flowability. , Plastic masses, 10, 1974, p. 51-52 - (prototype),