SU897790A1 - Composition for producing porous plastic material - Google Patents

Description

(54) COMPOSITION FOR OBTAINING FOAM

one

The invention relates to the production of foams and can be used in radio engineering, instrument making, etc.

Powder compositions are known that can be processed in foam plastic in a pressing-free way - by simple heating in a mold. Oco6eifflo processable are expandable powder compositions based on thermosetting oligomers.

Known KOMPOSISHP1 based on solid phenol-formaldehyde resins novolachnogo type tl3.

However, foam paste based on them requires a high temperature of curing (15О-2ОО®С) and is characterized by the fragility of Ctl.

A known composition for the preparation of a foam based on epoxy-ovolac block copolymer, containing, by weight.h .:

Bpoxypolymer

Surface active

substance1-2

And zodipzobutyronitol reel (porofor CHP-57) 0.5-8

Curing of such a composition is carried out at 15 ° C for 10 hours.

By introducing a catalyst (three ethanolamine) the curing temperature

. foam may be reduced to

Closest to the proposed is a known composition for the preparation of foams PEN-II, including, parts by weight:

Epoxy novolochny

block copolymer

63I6O e temperature

dropping 7O-85 SOU

15

K belts are organically and

foam stabilizer1, O

Triethanol {ino, 5

And pfonitrile

(porofor CHHZ-57) 0.5-8

20

Foam is obtained at 8 ° C.

However, this requires prolonged curing (2O-45 hours), and its strength is reduced by 2O-30% T2. The chain of the invention is to reduce the temperature and duration of curing of the foam while maintaining its strength properties. The goal is reached t & l, which is a compound to obtain a foam, contains, by weight. The supremely nodal silver block copolymer 6EI6O with a dropping point of 7 O-8 ° C. IQO Triethanolalv1,0-2,5 Silicon-oxygen stabilizer neNY2-5-5.0. Azodiisobutyronitrile 0.5-8.0 Epoxy-I-aow-volatile block copolymer is a solid product of partial copolymer. Polymerization of epoxy and volcanic phenol-formaldehyde resin, for example, 63I60 grade with a dropping temperature of 7 O-85 ° C. When using a block copolymer with a dropping point below 70 ° C., the foamable powder composition has an increased ability to compose a composition based on a block copolymer with a dropping temperature and does not spread well at temperatures below 1OO ° C. When the content of triethanolamine less than i, O wt.h. on 1OO wt.h. Block polyurethane foams, separated at a temperature of 10 ° C, have reduced strength, with an increase in the content of triethanolamine above 2.5 parts by weight / foamable compositions have a low viability and are poorly formed into synthetic plastic. Silicone with a VnapnMept foam stabilizer (polyorganosiloxane and polyoxyalkylene brands KZP-1, KSh-2), in an amount of 2.5 wt. per 100 wt.h. block copolymer improves spreading and foaming ability of composites. When its content is less than 2 wt.h. the compositions spread poorly at 75-85 ° C, with an increase in its content of more than 5 parts by weight. powder composites have an increased capacity for lump & your content of the gasifier (azodisobutyronitrile) is taken in the range used by the technique and provides foam polymers with apparent density of 6 O-300 kg / m. The foamable powder composites are obtained in ball mills by stirring and grinding the xc components for 5-10 hours. The use of such foamable composites can significantly reduce the temperature and the duration of their processing into foams, for example, at 5-80 ° C, you can get foams for 5- 10 hours or at 9О 11О ° С - for 1-2 hours while maintaining the high strength properties of the foam. °. Example. An epoxy novolac block copolymer 6E18H60 with a dropping point (300 g) is ground in a ball mill with an organo-cremium foam stabilizer CEP-Cyb g), triethanolamine {3, O g) and azodiisobutyronitrile (CHF-57 porophore 1.5 g) for The resulting powder composition is foamed and cured for a period of 10 hours. E and p 8 m 2. Epoxy-Novol block copolymer 6EIVO with temperature. A droplet drop of 80-C (150 g) is ground in a ball mill with a silicone foam stabilizer CEP-2 (4.5 g), triethanolamine (3.4 g) and azodynebio T1 phonitrile (b g). The obtained tsomyozia powder is foamed and cured for 2 hours. Example 3. The epoxy novolac block copolymer, BIOBO with a dropping point (10 O g), is ground in a ball mill with a silicone foam stabilizer CEP-1 (5 g), triethanolamine (1.5 g) and izodiizobutIronitrile (8g). The resulting powder composition is foamed and cured at within 8 h. The properties of epoxy-Novolac foam obtained from the compositions (examples 1-3) are shown in the table.

The introduction of powder compositions of the proposed composition will expand the use of epoxy-novolac laminoplates by reducing the temperature and the duration of curing.

Claims (2)

1.Arlin A.A., Shuto & F.A. Pevo-G polymers on the basis of the reaction of the oligomers, M., Khimi, 1978, p. ISO; 2.Berlin A.A., Shutov F.A, polymers based on reactononemobollamers, M., Khimi, 1978, p. 2444248 (protois).