SU138054A1 - Method for the production of thermoplastic products - Google Patents

Description

It is known that non-combustible polymers are formed during the condensation of bis-oxymethylene phosphinic acid with phenol.

A method is proposed for the preparation of thermoplastic linear resins based on the condensation products of bis-hydroxymethylenephosphinic acid and phenol.

A mixture of bis-hydroxymethylenephosphinic acid with a phonol and an appropriate amount of water is heated at its boiling point for 9 hours, as a result of which a gummy condensation product is obtained.

The condensation product is washed with water, triturated, washed again and dried. The resin is then dissolved in alcohol. The solution is filtered and evaporated in vacuo to form a solid foam mass.

The resulting polymeric products can be converted to a thermosetting state by the addition of compounds capable of reacting with the active hydrogen of phenol.

Under normal conditions, the resin does not burn and does not sustain combustion.

Example. 42.4 ml of water is added to 56.4 g of freshly distilled phenol and 90 g of bis-hydroxymethylenephosphonic acid. Bis-hydroxymethylenephosphinic acid is obtained from 95% crystalline tetraoxymethylenephosphonium chloride by boiling it with sodium carbonate for 9 hours in a 1: 1.2 molar ratio subsequent evaporation of the product in vacuum, dilution with concentrated SALTIC ACID, filtration and secondary evaporation in vacuum.

This mixture is placed in a round-bottomed flask and heated under reflux at the boiling point of the mixture for 9 hours, after which the product separates. The upper layer is drained, and the lower, resinous, in a hot state is removed from the flask. The resulting product hardens when cooled. It is washed with water.

No. 133054--2 grind in a mortar, again washed on the filter and dried. The resin is then dissolved in alcohol, with most of the resin going into solution, and less, sometimes in the form of white fawns, and sometimes in the form of a gel — remains undissolved.

The solution is filtered and evaporated in vacuo to form a solid pulverized mass, which is then ground. The resin color is cream.

The resin readily dissolves in acetone, alcohol, dioxane, and melts at a temperature of 88-90 °. The specific viscosity of a 1% resin solution in alcohol is 0.06 (at 20 °). Resin in normal conditions does not burn and does not support burning.

A solution of 2 g of resin in 2 ml of ethanol, after pouring onto a glass and drying at room temperature, gives colorless, hard, transparent films with good adhesion to the glass.

4.5 g of resin and 0.5 g of paraform are ground in a mortar. The resulting powder is cured at temperaura 150 ° under pressure. Get infusible, non-flammable product.

5 g of resin and 5 g of epoxy resin ED-6 are dissolved in 10 ml of acetone and glass cloth is impregnated with this solution. Curing takes place at 200 ° for 6 hours. Non-combustible fiberglass was obtained.

2 g of resin, 0.8 g of asbestos and 0.2 g of paraform are ground in a mortar and pressed at a temperature of 120 ° for 15 minutes. Get non-flammable and infusible product.

Subject invention

The method of producing thermoplastic products is distinguished by the fact that, in order to impart incombustibility to the products, they are prepared from resins obtained by condensation of bis-oxymethylene phosphonic acid with phenol, which are subjected to preliminary washing, drying, dissolving in alcohol and evaporation under vacuum.