SU887583A1 - Composition for producing stiff porous polyurethan - Google Patents

Description

(54) COMPOSITE FOR GETTING HARD POLYURETHANE FOAM

The invention relates to the field of obtaining rigid polyurethane foams used for the manufacture of thermal insulation coatings and the filling of product cavities in the preparation of simple and complex structures. Known compositions for the preparation of rigid polyurethane foam, consisting of a polyester, an emulsifier, a foaming agent, a curing catalyst comprising sodium acetate and triethanolamine, and polyisocyanate 1. The disadvantages of this composition are low strength, high water absorption, low viability, and also relatively low heat resistance . A known composition for the preparation of rigid polyurethane foam based on modified polyoxyals of lenpolyol, water, freon, surfactant; and polyisocyanate (21. The essential drawbacks of this composition are high water absorption, low viability, as well as low density at high density. The closest to the technical essence is a composition for the preparation of rigid polyurethane foam comprising foam stabilizer, foaming agent, water and curing catalyst with the following ratio of components, in its. h .: Isocyanate component (polyisocyanate RCT) 113-115 Simple gidroksilhlorsoderzhaschy polyester (Laprol 503N) 78 22 1.1

9.0-10 0.5-1.0

Sz. 1.5

The disadvantages of the known mixture include the low viability of the composition, the high toxicity of the used catalyst and the low strength of the foam.

The aim of the invention is to increase the viability, reduce the toxicity of the composition, as well as to improve the strength properties and increase the heat resistance of the final product.

This objective is achieved in that the composition for producing rigid polyurethane foam, comprising an isocyanate component, a simple hydroxyl-chloro-containing polyether, N-tetraoxypropylene diamine, a foam stabilizer, a foaming agent, water and a curing catalyst, contains a mixture of trichloromethylphosphate and methylene membrane, as well as a curing catalyst. , weight.4 .:

The isocyanate component (grade B polyasocyanate) 130-150 Simple hydroxyl-chloro-containing polyether (Laprol 503 M) 75-82 N-Tetroxypropylene diamine (Lapromol 294) 18-25 Foam Stabilizer (CEP-1) 1.2-2.0 Foaming Agent (Freon II ) 25-30 Water 0.5-1.0 Trichloroethyl Phosphate2, 0-5.0

Metilorange 0.2-1, 5

Marisi B polyisocyanate is a mixture consisting of 50-60% diphenylmethane diisocyanate and 0.33% phenylenisocyanate. General content

isocyanate groups in polisocyanate is 3%.

The introduction of methyl orange to the mass in the proposed ratio provides a balance of gas evolution and polymerization rates, and also contributes to the slower foaming reaction and the formation of a branched colored foam structure.

Methylorange

Methyl orange (benzene azodimethylaniline p-sulfonic acid) is obtained from diazotized sulfanilic acid by combining it with dimethylaniline.

Example 1. 75 weight parts are weighed into a polyethylene cup. Laprol 503 M, 25 weight.h. lapromol 294, 1.2 weight.h. , 30 vee.ch. freon-II 0.5 weight.h. water, 2.0 parts by weight trichloroethyl phosphate, 0.2 weight.h. methyl orange The resulting mixture was stirred with a mechanical stirrer for 3 minutes to a homogeneous state, and then 150 parts by weight was added. polyisocyanate and the whole mixture is stirred for 40-50 s, then vishvayut in a form where foaming and 4 | hardening occurs. Polyurethane foam is produced at room temperature.

Example 2. The manufacture of polyurethane foam is carried out analogously to example 1 in the following ratio of components, b.ch .:

78 22

1.5 25

1.0

0.4

2.5 145

The manufacture of foam is similar to the following ratio.

80 20

1.8 27

3.0 1.0 Methylorang0.7 Polyisocyanate 130 Example 4. Production of polyurethane ne is carried out similarly to Examples 1-3 with the following ratio of components, parts by weight: Laprol 503 M82 Lapromol 29418 CEP-1 1.9 Freon-lf27 Trichloroethyl phosphate 5, 0 Water1.0 - Methylorang 1.5 Polyisocyanate150 Experiments have shown that methylorange contributes to a uniform distribution of the foam stabilizer and foaming agent between the polyethers and the polyisocyanate. Methylane, due to the double contents of the bond between nitrogen and sulfur atoms, enters into chemical interaction with polyesters and polyisocyanate, as a result of which cross-links are formed

Seemingly with pL, kg / m.

Compressive strength, kgf / cm

Flexural strength, kgf / cm

Specific impact viscosity, kg / cm

Water absorption, kg / w for 1 day

7 days

 48.1 60.2 52.4

40-70

2.68 3.3 4.75 3.7

7.75

7.22 9.2

6.8

0,300,420,450,33

0,022, 0,020 0,020 0,022 3 "C-N, contributing to the good strength of the foam. The increase in the strength properties of the foam is explained not only by crosslinking, but also by the introduction of cyclic units into the polymer chain. The foam has a finely porous closed structure with a uniform color throughout the mass. Foaming occurs equally slow in time. The reaction ends simultaneously with the end of gelation, and this in turn contributes to the formation of a homogeneous structure of the foam, i.e. a foam structure is formed with a uniform gas pressure inside the cell. The catalytic effect of methyl orange can be explained by the fact that during dissociation an intermediate, very unstable product is formed. The table presents data on the dependence of the catalytic activity of the compositions and the physicomechanical properties of rigid polyurethane foams.

Table continuation

Claims (1)

The claims of the final product, the composition as a curing catalyst ₂₀ contains a mixture of trichloroethyl phosphate and methyl orange in the following ratio of components, parts by weight: Isocyanate component 130-150 25 Simple hydro silchloro-containing polyester 75-82 N-Tetraoxypro pylenediamine 18-25 Foam stabilizer 1, 2-2.0 thirty Foaming S agent 25-30 Water 0.5-1.0 Trichloroethyl phosphate 2.0-5.0 35 Methyl orange 0.2-1.5 Composition for producing rigid polyurethane foam including isocyanine ... a noble component, a simple hydroxylchlorinated polyester, Ν’-tetraoxypropylene diamine, a foam stabilizer, a blowing agent, water and a curing catalyst, characterized in that, in order to increase the pot life, reduce the toxicity of the composition, and also improve the strength properties and increase the heat resistance