SU335966A1 - Method for producing roamed plastics based on liquid novolag phenol formaldehyde resin - Google Patents

Description

(21) 1453094 / 23-05

(22) 07.06.70

(46) 05/15/84. Bul № 18 (72) V.A. Novak, Yu.S. Murashov and V. D. Valgin (53) 678.632 (088.8)

(54) (57) METHOD FOR OBTAINING FOAM PLASTICS ON THE BASIS OF LIQUID NEW MAIN PHENOLFORMALDEHYDE RESIN in an acidic medium in the presence of foaming and cross-linking agents and targeted additives that differ in the production of foam plastic with improved body-mechanical component. sulfonic acid solutions or emulsions. This invention relates to a method for producing foams from liquid novolac-type phenolic resins. A known method is to obtain foams based on a liquid novolac resin foamed and curable in an acidic medium in the presence of a crosslinking agent. The disadvantages of this method are the complexity of the foamable mixture and the increased bone strength of the foam. The purpose of the invention is to eliminate this disadvantage. This goal is achieved by using a sulfonic acid resin solution or emulsion that combines both the polymer base of the foam and the acid hardening catalyst. . At the same time I get a light foam (bulk weight 20100 kg / m) of dark cherry color, having high bending rates (2-12 kg / cm against 0.3-3 kg / cm for the foam obtained by a known method). The invention provides for the production of foam by mixing a liquid sulfonovolk or a mixture with a new lacquer resin (100 weight, h) with the following components, parts by weight: Formaldehyde 10-40 (or phenol-10-100 alcohol) Organic nitrogen-containing compounds and their derivatives , 5-50 Surface active substances 0--10 Liquid boiling liquids 0-30 Compounds that react with water or acid catalyst with heat release 0--20 The rate of foaming and curing is regulated by the use of a liquid vonovolk sul containing a given number of sulfo groups in the calculation for one aromatic draw. To obtain foams with minimal residual acuity and low water absorption, it is preferable to use a fulvolac sulch in which no more than 0.15 sulfo groups per aromatic core. The foaming of the sulfonovolac and the formation of a curing foam proceed under mild conditions at room temperature or at moderate (not higher than 100 ° C) heating and for a short time, calculated by a few g / cuts, time interval. With the proper prescription selection of components within the limits specified in the invention, the acquisition of foams that do not give technical shrinkage after the completion of the molding process is provided. The phenol-formaldehyde foams obtained by the proposed method are intended to be used as thermal insulation and structural materials in various areas of technology (construction, engineering, etc.). Example 1. A 70% aqueous solution of a sulfonated novolac resin obtained by reacting phenol, formaldehyde and sulfuric acid in a molar ratio of 1: 0.7: 0.3 is used as the basis of the composition. To 100 weight. parts of this resin are added with stirring 5 weight.h. urea, 2 weight.h, OP-7, 10 weight. h. freon 113 and 39 wt.h. 80% aqueous solution of 2,4, b-trimethylolphenol. A mixture is obtained from the mixture of these components, which foams and hardens in the cold (-16 ° C) to form a rigid foam having a bulk weight (g) of 38 kg / m and c5, g 4.3 kg / cm. Example 2. In the composition of Example 1, 38 parts by weight were used instead of 2,4,6-trimethylolphenol. 36% formalin. To obtain a foam plastic at 66 kg / m, such a composition is heated at 4 ° C for 17 minutes. Example 3 Composition is prepared by mixing the following components, parts by weight. : Sulfonated novolac resin (according to example 1) in the form of a 70% aqueous solution 100 2,4,6-trimethylolphenol 40 Freon-IZ10 The resulting composition foams and Cures at room temperature with the formation of foam plastic, which is characterized by - 152 kg / m. PRI me R 4. Sulfonated novolac is obtained by sulfonation of 1 mol of phenol with 0.08 mol of concentrated sulfuric acid and subsequent condensation of the obtained product with 0.65 mol of formaldehyde. Before using 100 weight. including the obtained sulfonovolume emulsify 25 weight.h. water. In the composition for the production of foam, except for 100 wt. including the aqueous emulsion sulfonated novolac resin, containing 0.076 sulfo groups per aromatic core, the following components are also added, parts by weight: Silicone oil 1.5 Aluminum powder 1 Urea salt with I p-phenolsulfonic acid (1: 1 by weight ) 3

 (75%) 3

Resolna resin50

Example 5. 100 g of an 80% aqueous solution of sulphonated but wolf is mixed with 5 g of 1,1,2-trichlor1, 2,3-trifluoroethane (freon-113) and

30 g of a 60% aqueous solution of trimethylolphenol. The resulting composition is poured into a card box, where it foams and cures for 3.5 minutes at room temperature, forming a rigid foam with a bulk weight of about 210 kg / m.

Example 6. When added to the composition according to Example 5, an additional 2 g of OP-7 under similar conditions, a foam is obtained with a homogeneous microcellular structure and a bulk weight of about 1 00 kg / m - 9.5 kg / cm.

Example 7. A building panel element is obtained by molding at 50 ± 2 ° C in a wooden form with a size of 2x1x0.15 m of a foaming composition formed when mixing parts by weight: 100 liquid sulphonated novolak (80% aqueous solution), 28 liquid novolac resin, 5 freon113 and 40 37% formalin. The panel has an average volumetric weight of about 90 kg / m.

Example 8. A shell in the form of a half cylinder suitable for heating the heating mains is obtained by pouring into a metal mold (2 m long and 1020 mm in diameter) a composition containing parts by weight: 100 75% aqueous solution of sulfonewax, 10 trichlorofluoromethane (freon 11) and 88 of a liquid reole resin with a content of methyl groups of 23.1 wt.% And solids 85 wt.%. The composition of this composition foams at 20j; ic for 7 minutes. The resulting polystyrene shell has a bulk weight of 82 kg / m.

Example 9. Under the conditions of Example 8, when introducing into the composition of the composition of Example B organosilicon

.Mtspci About Kpt; nri i-b-j-

And (0.5 wt.Ch.) get skorzhidkosty 60 kg / m 7,25 kg / cm magnifier with

Example 10. To obtain a foam plastic with k.ch. 25 mg KOH / g and moisture absorption of about 9% by weight (per day) use the composition of Example 8, but liquid sulfonovolac is used as the basis of the composition, in which 0.1 sulfo groups are used for one aromatic core.

Claims (1)

METHOD FOR PRODUCING FOAM PLAS- TOV BASED ON A LIQUID BATTERY FAIRY NOLFORMALDEHYDE RESIN in an acidic environment in the presence of blowing and cross-linking agents and target additives, which is important because, in order to obtain a foam with improved physical and mechanical properties, sulfonovolac solutions or emulsions are taken as novolac resin.