SU1235875A1 - Composition for producing polyizocyanurathic foam plastic - Google Patents

Description

"

This invention relates to compositions for the preparation of polyisocyanurate foams used in aircraft, aircraft, ship J, and instrument making.

The aim of the invention is to remove the water absorption and preserve the dielectric properties of the foam under conditions of high humidity.

Example 1. To obtain an asta foam from the proposed composition, a one-step process is used, in which all the components of the formulation are mixed simultaneously, as a result of which the foaming and curing of the composition takes place in one stage.

For this purpose, two compositions are prepared. Composition 1 includes diisocyanate, epoxy resin, foaming agent. Part 2 includes a gas-forming agent, a ferrocene trimerization catalyst. Before use, both compositions are thermostatic at 20 + 2 ° C. Compositions I and 2 are displaced using either a batch mixer, which is a frame high-speed agitator (2.0-3.0 thousand, rpm or a filling machine with a mixer after smashing the compositions and obtaining the foam, the latter is subjected to heat treatment at 150 ° C for 4 hours,

As a diisocyanate, a 40% solution of carbodiimide in 4, it-diphenylmethane diisocyanate (MDI), obtained by heating IDN in the presence of a catalyst, containing 26 wt.%, Isocyanate groups, is used.

As an epoxy resin, epoxy resin D-20 ED-20 or bromine-containing epoxy resin UP-631 based on epichlorohydrin and tetrabromodiphenylolpropane are used.

The foaming agent is a silicone surfactant — a silicon-containing block copolymer of oligooxyethylene and oligooxypropylene, in particular CEP-6.

Trimerization catalysts are tertiary amines - 2,4- and 2, (dimethylaminomethyl) phenol, etc.

Ferrocene in the composition plays the role of a catalyst for the interaction of epoxy resin and carbodiimide in MDI.

ten

358752

From the composition in the following ratio of components, May, including:

Modified MDI with a concentration of isocyanate groups, 0

Bromine-containing epoxy resin5.0

Silicone block copolymer CEP-61.0

ciC, E, y - tris (dimethylaminomethyl) phenol 3,0

Freon - 112,0

Ferrocene0,0

in this way, a foam is obtained in a closed form with an apparent density of kg / m.

Example 2. Of the composition in the following ratio of components, May, h ,:

15

20

60% solution of carbodiimide in MDI with the concentration of isocyanate groups

26% 100.0

Bromine-containing epoxy resin 20.0 Silicone block copolymer CEP-61.0 oi, (i, y-tris (Dime tylamine type) phenol 3.5 Freon-1 1 15.0 Ferrocene 0.1

in this manner, a foam plastic with an apparent density of –v 70 kg / m is obtained in a zyu: nuta form,

Example 3, From the composition in the following ratio of components f May, h ,;

40% solution of carbodiimide in MDI with a concentration of isocyanate groups of 26% 100.0 Bromine-containing epoxy resin. la30,0

Silicone block copolymer1O

oi, p, J-tris (dimethylaminomethyl)

phenol. 4.0

Freon 1 16.0

Ferrocene0,4

in this way, a foam is obtained in closed form with an apparent density of 70 kg / m,

Example 4. From the composition in the following ratio of components, ma.ch .:

50% solution of carbodiimide in MDI with a concentration of isocyanate groups of 26% 100.0 Bromine-containing epoxy resin 20.0 Silicone-organic block copolymer CEP-6 2.0

sg, f, 3 Dimethylaminomethyl)

phenol2.0

Freon-1125,0

Ferrocene0,1

in this way, a foam is obtained in closed form with an apparent density of kg / m.

Example 5. From the composition in the following ratio of components, wt.ch .:

40% solution of carbodiimide in MDI with a concentration of isocyanate groups

28%. 100.0

BroM-containing zpoxy resin20, 0 Silicone block copolymer CEP-60.5 06,. /, Y-tris (Dimethylaminomethyl) phenol5.0 Freon-11 10.0 Ferrocene 0.1 In this way, foam plastic with apparent density l / 100 kg / m.

Example 6 (comparative) Of the composition in the following ratio of components, wt.h .:

2358754

60% solution of carbodiimide in MDI with a concentration of isocyanate groups of 5% 26% 100.0 Epoxy resin (ED-20) 20.0 Silicone-organic block copolymer 10 measure CEP-60.5

, ft, iS (dimethylaminomethyl)

phenol - 4.0

Freon-1116,0

15Ferrocen0,1

in this way, a foam is obtained in closed form with an apparent density of kg / m.

Example 7 (comp. 20 is known).

From the composition with the following ratio of components, m

Polyisocyanate with 29.5% isocyanate group content 100.0

Epoxy-dianone resin ED-20 10.0 Silicone block copolymer1, 0. / Y-tris. (Dime tilamino methyl) phenol 5.0

Freon 11.16,0

in this way, a foam is obtained in closed form with an apparent density of kg / m.

Example 8 (known composition).

From the composition with the following ratio of components, mac.h .: Polyisocyanate with a 29.5% content of isocyanates of 100.0

Epoxy Dianova Emola ED-20 20.0

Silicone block copolymer1, 0

ot, / j, y-tris (Di-.

methylaminomethyl) phenol5.0

Freon-1116,0

In this way, a foam is obtained in closed form with an apparent density of 70 kg / m.

Example 9 (comparative). From the composition with a trace of lean components, mac.h. Polyisocyanate with 29.5% isocyanic content of groups 100.0 Epoxy-cyan resin ED-20 20.0 Silicone-organic block copolymer CEP-61.0 (I, i.y-trig (Dimethylamino methyl) phenol 5.0 Ferrocene 0.1 Freon-1 16.0

according to the procedure, a folded foam is obtained in a folded form with an apparent lot of 70 kg / m.

Example 10 (comparative). From the composition during the next component correction, ma.ch.5

60% solution of carbodiimide in IDN with a concentration of isocyanate groups of 26% Tetrabromo-containing epoxy resin UP-631

100.0

20.0

Destructive stress in compression, MPa

Impact viscosity, kJ / m

Water absorption, Z, for 24 h

Fragility, mas.X

Flammable by fire tube method

loss, may.2

burning time after flame removal

0.560,600,590,251,030,610,540,500,500.35

0,180,170,190,130,30,180,170,160,17.0,20

0.650,600,720,500,830,650,932.02.02.5

8,59,08,0126,39,18,715,215,47,4

16.2 13.5 11.3 14.8 And 9 22 22

Oh oh

26

23.0 18.0

1.0

3.5 16.0

0

five

Organosilicon block copolymer CEP-6

about L (Dima tilamino methyl) phenol Freon-I

in this way, a foam is obtained in closed form with an apparent density of 70 kg / m,

t

The table shows the properties

the foam of the proposed composition (examples 1-5). The data of water absorption, as well as dielectric loss of foams based on the proposed composition (example 6), a known constitution (examples 7 and 8), as well as compositions with the limiting content of components (examples 9 and 10) show that foams based on the proposed compositions containing carbodiimide-modified MDI, bromine-containing epoxy resin and ferrocene are characterized by reduced water absorption and improved dielectric properties.

0

30 In addition, the use of bromine-containing epoxy resin significantly reduces the flammability of the foam.

26

23.0 18.0

Properties of the foam

and h. j; in j o

. ... - ““ li -.- -Lsh. ..,., - J ..- ,,

The tangent of dielectric loss angle at a frequency of H Hz

in normal

climatic

conditions

tgS -Y 0.8

after exposure to relative humidity conditions with () 1 93+ t 3Z at t " Ot2 C for 21 days, tgS. 10 4,6

0.9 0.9 O, A 1.1 0.9 0.9 1.1 1.0 0.9

5.0 5.5 A, O 7.0 5.6 10 20 II 10

Editor N.Egorova

Compiled by V.Mkrtychan

Tehred O. Proofreader A.Obruchar

Order 3058/21 Circulation 470Sho-dsipnoe

VNIIPI USSR State Committee

for inventions and discoveries 113.035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgo.Rod, D. Rekti St., 4

Table continuation

Composition komloeits for example

Claims (1)

COMPOSITION FOR PRODUCING POLYISOCYANOURATE FOAM, including isocyanate component, epoxy resin, trimerization catalyst, silicone type foam stabilizer, freon, characterized in that, in order to reduce water absorption and preserve the dielectric properties of the foam in high humidity conditions, it additionally contains ferrocene as an isocyanate component - a 40-60% solution of carbodiimide in 4,4'-diphenylmethanediisocyanate with the content of isocyanate groups of 25-28 wt.% in the following ratio of components, ma .ch .: 40-60% solution of carbodiimide in 4,4'-diphenylmethyl indium zocyanate with a content of isocyanate groups of 25-28 wt.% Epoxy resin Silicone foam stabilizer type Trimerization catalyst Freon Ferrocene