SU47697A1 - Method for producing phenol-aldehyde resins - Google Patents

Description

The invention relates to methods for producing phenol-aldehyde resins and differs from previously known methods in that it includes, as an additional component, a preparation of oxidized hydrocarbons, the purpose of which is to reduce the cost of resites and in some cases improve their quality. The oxidized mineral oil preparation is produced by oxidizing hydrocarbon oils with oxygen in air in the presence of appropriate catalysts to a content of 20–30% of the mixture of acids. The oxidized oil is a complex mixture representing a colloidal solution of various hydrocarbons, acids, higher aldehydes and alcohols. Its chemical and physical conditions depend on the type of oil and the oxidation conditions. Both the directly oxidized oil and the acids extracted from it can be used for the introduction of resitas, but in many cases it is more rational to use oxidized oil or acids subjected to esterification with alcohols: methyl, ethyl, propyl, butyl, amyl, glycol, glycerin and etc. The esterified oxidized hydrocarbon oils or acids from them, as such or after appropriate deodorization and bleaching, are introduced into resole resins, which are then converted into rubber when heated without pressure or under pressure. s. It is also possible to introduce preparations of oxidized hydrocarbons or their acids into phenols prior to condensation of the latter with aldehydes. Petroleum oils, shale distillates, products of distillation of peat and brown coal tar, turpentine, various waste of turpentine and fir oil, etc. are used as initial hydrocarbon oils.

Example 1. Oxidized liquid paraffin beats. at. 0.905, containing up to 20–25% of the mixture of acids, is esterified with ethyl alcohol in the presence of petroleum sulfonic acids, as a catalyst. The excess alcohol is distilled off, the esterified oil, without removing the sulfonic acids, is introduced into the liquid carbolite resin before the introduction of the catalyst — the oil of sulfonic acids, which come with the esterified oxidized hydrocarbon oil. The amount of oxidized oil preparation administered ranges from 10 to 25%.

PRI mme R 2. A mixture of acids consisting of approximately 70-80% of acids soluble in gasoline and 20-30% of gasoline insoluble hydroxy acids is extracted from oxidized vaseline oil. The mixture of acids is esterified with alcohols and the esters of the acids are used in the initial stage of condensation together with phenol or cresol in approximately the following ratio: 100 weight parts of technical cresol containing 50-60% meta-cresol, 50% esters of acids, 15-20% paraform.

The mixture is heated to form a gum.

The use of esterified oxidized oils or esters of acids isolated from oxidized oils during the condensation of phenols with aldehydes is possible in a wide variety of variants; monohydric and polyhydric phenols can be used, and of aldehydes, in addition to formaldehyde, acetaldehyde and furfural.

The introduction of oxidized oil preparations, on the one hand, reduces the cost of condensation products, on the other hand,

increases their water resistance, and in some cases, such as when producing cast products, facilitates the production process, since their presence slows down the polymerization process, which makes it possible to heat the resin to remove water to a higher temperature.

The subject matter of the invention.

A method for producing phenol-aldehyde resins, characterized in that during the condensation of phenols with aldehydes, esterified oxidized hydrocarbons or esters of acids separated from oxidized oils are introduced as an additional component at any stage of the production.