SU334849A1 - Method of obtaining phenol-formaldehyde foam plastic on base of liquid novolak resins - Google Patents

Description

(21) 1453095 / 23-05

(22) 07.06.70

(46) 10/30/84. Bul No. 40

(72) V.A. Novak, Yu.S. Murashov.

and V.D. Valgin

(53) 678.632 (088.8)

(54) (57) 1. METHOD FOR PREPARING PHENOL FORMETA FOAM FOAMS ON THE BASIS OF LIQUID NEWWARE RESINS in the presence of foaming curing, crosslinking and acidic agents and additionally targeted, characterized by the fact that, in order to reduce gas emissions, for example, in order to reduce gassing, for example, in order to reduce gaseous emissions, for example, in order to reduce gaseous emissions, there is also a purpose for this purpose, which in order to reduce the gas emission, there is a lack of a specific purpose for reducing gaseous emissions.

and formaldehyde during the preparation and operation of the foam, nitrogen-containing organic compounds are introduced into the resin, capable of reacting with formaldehyde or forming complexes with phenol, in an amount of 0.5-50 parts by weight. per 100 ees. liquid Novolac CMOJUI.

2. A method according to claim 1, characterized in that the nitrogen-containing compounds are introduced in the form of products obtained by reacting these compounds with mineral or sulfoaromatic acids and / or with formaldehyde. The invention relates to the preparation of foams based on liquid phenolic resins of novolac type. A known method for producing foam plastic from a liquid novolac resin that is foamed and hardened in the presence of liquid crosslinking agents in an acidic medium. The proposed method differs in that in order to reduce gassing, for example, phenol and formaldehyde, nitrogen-containing organic compounds with a pKa lower than 8, capable of reacting with formaldehyde or forming complexes with phenol, are introduced into the resin in the process of obtaining fj hydrolysis of the noplast. These compounds are administered in an amount of 0.5-50 parts by weight. per 100 weight parts liquid Novolac resin. Received by the proposed method, the foams practically do not contain free phenol and formaldehyde. According to the proposed method, the foam is produced by mixing sparse components, parts by weight: Liquid Novolak Formaldehyde 10-40 (or phenol alcohol) 10-100 Organic nitrogen-containing compounds and their derivatives 0.5-50 Surface active substances 0-10 Boiling liquids. 0-30 Water or acid reactive catalyst with heat release. 0-20 Acidic curing catalysts 2-50 Examples of nitrogen-containing organic substances are meladlin, urea dicyandiamide, M-phenyleneriamine, anyLIN, thioumo. Wine, etc. Nitrogen-containing compounds are more expediently introduced into the composition in the form of solutions, emulsions or dispersions of them in water or in suitable organic solvents or in the form of their derivatives: complex salts with strong (mineral or organic mineral acids); resins, predistavl to Tsikh products of condensation of urea, melami, dicyandiamide and the like i with formaldehyde in an alkaline or acidic environment. 9 Examples of such derivatives are urea solids, sulphate urea, urea salts with arylsulphonic acids, mbechevo and melamine formaldehyde resins, as well as co-condensation products of phenolsulphonic acids with formaldehyde and organic compounds, with the same amount of nitroxidic acid and formaldehyde and organic compounds, and they will be combined with the same amount of nitric acid, formaldehyde and organic compounds, and they will contain the same amount of nitric acid, formaldehyde and organic compounds that will be used in combination with the formaldehyde and organic compounds, and they will contain the same amount of nitric acid, formaldehyde and organic compounds that will be used in combination. nitrile group (trade name products VAG). The compositions resulting from the mixing of the above components are acidified with an optional. to pH below 3, after which they foam spontaneously or with the use of forced heating in a form where the curing foam is given the required size and configuration. In the process of foaming the compositions, the vaporization of phenol and formaldehyde is not observed in any significant concentrations. The final product is not "Contains free phenol and formaldehyde. Foam can be used as a heat and cold insulation material in a wide variety of engineering fields. Example. The following components are mixed, parts by weight: aqueous emulsion novolac resin 100, surfactant 2, 10% solution of melanin in formalin 40, freon 113 10 and toluenesulfonic acid 15. The resulting composition is placed in a heating cabinet with a temperature where it is foamed and cures within 30 minutes, forming a foam with a bulk weight of 75 kg / m. , Example 2. In order to obtain foam plastic with a bulk weight of 63 kg / m, the composition of the composition of the composition, parts by weight, is cured and cured with a room (18s) temperature: Water emulsion novolac resin 100 Urea formaldehyde resin (60% aqueous solution) 7 2,4,6-trimethylolphenol (60% aqueous, solution) 35 Freon-117, P-toluenesulfonic acid 15 PRI mme i 3. The formulation of the foaming composition, vee. Liquid Novolac resin 100 Silicone oil 3 P -Pentane6 Resole resin 80 Acidic joint condensation product of 1 mol. Of phenol sulfonic acid, 0.5 mol of chevine and 0.5 mo. formaldehyde20 The composition components are mixed in the above sequence, after which the resulting composition is foamed at room temperature to obtain a foam with a bulk weight of about 60 kg / m. Example4. Naoo weight. h. liquid Novolac pitch is taken, parts by weight. aluminum powder 0.5; chloroform SP-10 2; 2,4,6-trimethyl-Lphenol X70% aqueous solution) 40. To the mixture of these components, 1a was added, t when the co-condensation product was 1 mol of phenolsulfonic acid with 0.3 mo of M-phenylenediamine and 0.5 mol of formaldehyde. The resulting composition is expanded without external heating. giving a foam with a bulk weight of 74 kg / m. EXAMPLE 5. The following composition foams at room temperature, forming a foam with a bulk weight of 74 kg / m, parts:,. Liquid Novolac Resin 100 Reszolna resin type FRV-1 (MRTU 6-09-1104-67) 60. Urea salt, 12 Aluminum powder 2 A mixture of 36% hydrochloric acid and 75% 30 Phosphoric acid is added in a 1: 1 composition by weight. PRI me R 6. Consistently mixed 100 weight.h. water emulsion novolacnogo smly, 3 weight.h. lecithin, 10 weight.h. freon 113 and 40 weight.h. 37% formalin. To obtain a foam, 30 parts by weight are added to the mixture with stirring. 40% aqueous solution of toluenesulfonic acid in acrylonitrol. And the composition of the composition is placed in a heating cabinet with a temperature of 65 ° C for 30 minutes. Bulk weight of the resulting foam is 78 kg / m.

Claims (2)

1. METHOD FOR PRODUCING PHENOLFORMALDEHYDE FOAMS ON THE BASIS OF LIQUID WATER-RESIN RESINS in the presence of foaming curing, cross-linking and acid agents and additives for the intended purpose, characterized in that, in order to reduce gas emissions, for example, phenol and formaldehyde, polymer is introduced into the process and nitrogen-containing organic compounds with pKa <8, capable of reacting with formaldehyde or forming complexes with phenol, in an amount of 0.5-50 parts by weight per 100 parts by weight liquid novolac resin. 2. The method according to p. 1, characterized in that the nitrogen-containing compounds are introduced in the form of products obtained by the interaction of these compounds with mineral or sulfoaromatic acids and / or with formaldehyde. ¹ 334849 ²