SU39391A1 - The method of obtaining resinous products - Google Patents

Description

The present invention relates to methods for producing resinous products from phenols and cellulose in the presence of sulfuric acid.

The production of the condensation products of phenol with cellulose is greatly hampered by the fact that when the total amount of pulp (sawdust, paper pulp) required for the phenol binding is introduced into the reaction vessel, a mass is obtained which is so difficult to stir that it is impossible to heat the mass. overheating and partial charring. In addition, part of the resin, due to overheating, becomes insoluble and infusible form and can not be further used. In this case, most of the cellulose does not participate at all in the reaction due to the fact that the theoretical amount of phenol required for the reaction cannot moisten the whole cellulose. This leads to the fact that all phenol, which could be bound by fiber, does not enter into the reaction, therefore 15 to 20% of free phenol remains in the condensation products.

The author of the present invention proposes a method for producing resinous products from phenols, which does not have the above disadvantages.

The method consists in that the paper pulp or sawdust is moistened with a solution of ferrous sulphate and after incubation in air is introduced into the phenol melted with sulfuric acid. The condensation reaction is carried out until a homogeneous mass is obtained, which is then treated with water at boiling and dried at a temperature not higher than 80 °. To obtain a pure product, the obtained resin is extracted with alcohol.

The proposed method has the advantage that it allows cellulose to be introduced into the reaction sphere not only in the quantity necessary to bind phenol, but even several times larger.

This is of great interest for the production of plastics from artificial resins using wood flour, paper pulp, etc., as fillers, since this method can be used for the manufacture of various objects by pressing to directly use the mass obtained after the condensation reaction followed by bales. with water to remove water-soluble substances and drying. Due to this, it is not necessary to extract the resin with a solvent, impregnate a plasticizer with this solution, and consequently, the production of items from plastics is much cheaper.

Example. 140 g of sawdust (moisture LOVO) moistened with a solution of 7 2 iron sulfate in 240 g of water. lay out a thin layer and shovel. After several hours, sawdust containing 60 to 70% of water is introduced into the boiler with phenol (100 g) containing 12 g of sarnon acid. Heating is carried out under reflux until a homogeneous mass is obtained that does not contain impregnated wood. The remaining mass is treated with water, dried at 50-70, after which the resulting powder can be directly compressed. 3 if it is necessary to obtain a pure resin, the last copy of the dry mass corresponds to dig1 solvent.

The subject matter of the invention.

1. A method of producing resinous products from phenols and cellulose with the addition of sulfuric acid, characterized in that the pulp is moistened with a solution of ferrous sulphate and, after being exposed to air, is introduced into molten phenol with sulfuric acid, treated with boiling water, dried at temperature not higher than 80 ° C and extracted with spirk to obtain a pure resin.

2. The use of the resin prepared according to the method indicated in clause 1 for the manufacture of plastics with the introduction of sawdust, several times more of them, with the aim of obtaining various objects with the resin by stamping.