SU979404A1 - Process for producing polyfuran foamed plastic - Google Patents

Description

The invention relates to the production of foams, which can be used in industrial and civil construction, aviation and aerospace, mechanical engineering and in a number of other areas.

Foamed polyfurans are obtained by foaming and curing in an acidic environment furan oligomers or furanal alcohols in the presence of targeted additives.

A known method for producing foamed polystyrene foam in an aqueous or hydroalcoholic medium in the presence of SI acid.

There is also known a method for producing polystyrene foam from furfuryl alcohol, its prepolymer and / or forsopolymer in the presence of an acidic catalyst and low molecular weight additives 23.

The disadvantages of the methods are relatively low physicomechanical properties of foams, the complexity of the system and the relative high cost of the starting components.

The closest to the proposed technical essence and the achieved positive effect is the method of obtaining polyfuran

foams, according to which the starting composition for the preparation of semi-furan foam contains furfuryl alcohol or a mixture of furfuryl alcohol with a furfuryl alcohol-based prepolymer, surfactant, foaming agent and acid catalyst.

The foam obtained according to

10 this method has low strength properties; high moisture absorption. In addition, for this method, the relative high cost of the starting compounds is characteristic, since

15 Furfuryl alcohol is used to synthesize the prepolymers and reduce their viscosity. The purpose of the invention is to increase the strength, reduce moisture absorption and reduce the cost of the final product.

This goal is achieved by the fact that according to the method of producing polyfuraic foam by foaming and curing a composition based on furfural derivatives, a surfactant, a foaming agent and an acid catalyst, and as derivatives

Claims (3)

30 furfural use the bottom residue of the production of furfuryl alcohol of the following composition, parts by weight: Water 0.214-0.262 Furfural 0.188-0.226 Tetrahydrofuryl alcohol O, 345-0.47C Furfuryl alcohol 23 66-34.7 Methyl alcohol 0.710-0.914 1.5 - and 2,5-Pentanediols13, 84-14, Oligomeric part of furfuryl alcohol of linear structure 56.60-44, Impurities. 4,443-4,1 or its oligomers. Example 1. The composition for foaming consists of two components A and B. Component A contains 130 mas. VAT residue of the production of furfuryl alcohol with the content of hydroxyl groups, 11.2-12%, viscosity 0.2-0.22 Pa-s, 3 wt.h. aluminum powder, 0, 05.mae silicone surfactant, 5.0 mach.h. methylene chloride, 4 ma.h. water. Part B contains 21.8 mph. sulfuric acid (96%), 14.5 May. 4. ethylene To get the polypropylene first, component A is mixed for 30 with a frame-type stirrer with a rotational speed of 1400-1500 rpm, and the pre-weighed amount of component B is quickly added. , the lid is stirred for 5–7 s and poured into a metal cell shape with a size of 160 x 180 x X 70 mm, preheated to 303-313K. Example 2. The oligomer of the cubic residue of furfuryl alcohol is obtained as follows. 784 g of the cubic production of furfuric alcohol, 120 g of water and 23.4 cm of a 30% aqueous solution of maleic anhydride are placed in a 1-liter three-necked flask equipped with a stirrer, a thermometer and a water bath heated to 343 K. With stirring, the mixer is heated to 369-371 K for 20 minutes and maintain this temperature for 180 minutes. After that, the contents in the flask are cooled to 313 K and 10.8 cm 40% aqueous sodium hydroxide solution is added. Water is distilled off by vacuum distillation at 338-358 K 20-25 mm Hg. 75 minutes The resulting oligomer based on the bottom residue of the production of furfuryl alcohol has a viscosity of 0.53 Pa-s at 298 K and contains 8.4% of hydroxyl groups. . Penopolyfuran get the following way. - Composition for foaming consists of two components A and B. Comp nent A contains 125 mas. oligomera, 0.45 mac. silicone surfactant, 3 ma.ch. aluminum powder, 6 mah. methylene chloride, 9 mph. furfuryl alcohol. The is component contains 21.6 mph. sulfuric kieloty (96%), 14.4, mac. ethylene glycol. The conditions for producing polyurethane foam are similar to those given in Example 1 b. Example 3. The composition for foaming consists of two components A and B. Component A contains 150 parts by weight. oligomer with a hydroxyl content of 6.09%, a viscosity of 0.822 Pa “s at 298 K, obtained by homopoly condensation (for 300 min) of a cubic fur of furfuryl alcohol, 0.45 mash.h. silicone surfactant, 3 ma.ch. aluminum powder, 12 mau.ch. carbon tetrachloride, 10 ma.ch. furfuryl alcohol. Component B contains 24 mah. sulfuric acid (96%), 15 mph. ethylene glycol. The conditions for preparing the oligomer are similar to those given in Example 2, and for the foamed polyfuran in Example 1. EXAMPLE 4 The foaming composition consists of two components A and B. itoMnoHeHT A contains 130 mas. VAT residue produced furfurilovogo epirata, 0.6 mach.h. silicone surfactant, 3 ma.ch. aluminum powder, 5 ka.ch. methylene chlorite, 1.2 parts by weight, water. Component B contains 18 ma.ch. sulfuric acid (96%), 4 wt. maleic anhydride, 14 mph. ethylene glycol. The conditions for preparing the foamed polyfuran are as given in Example 1. Example 5. The composition for foaming is composed of two components A and B. Component A contains 65 parts by weight. The bottoms oligomer is e with a hydroxyl group content of 6.09%, a viscosity of 0.822 Pa-s, at 298 K, 70 wt.h. vat residue proizdoddeva furfuryl alcohol, 0.5 ma.ch. silicone surfactant, 3 ma.ch. aluminum powder, 9 mch. methylene chloride, 3, wt. furfuryl alcohol. Component B contains 19.5 mph. sulfuric acid (96%), 4.7 wt.h. maleic anhydride, 14.8 mac. ethylene glycol. Conditions for obtaining polyurethane foam and. The oligomers are dialogic given in examples 1 and 2, respectively. Example (prototype). Foamed polyfuran according to a known method is obtained and tested similarly to foamed polyfurans by the proposed method. . The properties of the foams obtained in examples 1-6 are shown in the table. The data in the table show that the bottoms residue of the production of furfuryl alcohol and / or its oligomers, with its availability and low cost, allows to obtain polyvinyl resin that is not inferior to the polystyrene foam in the prototype, and its strength and moisture resistance are better than it. Claim method for producing polyfuran foam by foaming and hardening a composition based on furfural derivatives, a surfactant, a foaming agent and an acid catalyst, characterized in that, in order to increase strength, reduce moisture absorption and reduce the cost of the final product, as furfurol derivatives use the bottom residue of the production of furfuryl alcohol of the following composition, wt.h; 0.214 g-0.262 Furfurol 0.188-0.226 Tetrahydrofuryl 0.345-0.474 23.66-34.7 Furfuryl alcohol 0.710-0.914 Methyl alcohol, and 2,5-Pentane13, 84-14.6 The oligomer part of furfuryl alcohol 56.60-44,704 of linear structure 4,443-4,12 Impurities and / or its oligomers. Sources of information that are considered in the examination 1.Patent of France W 2250796, C 08 E 9/02, published. 1975. 2. The UK patent dl408873, C 08 3 9/02, published. 1975. 3. The patent of the USSR 508216, C 083 9/00, 1972 (prototype).