CS247331B1 - Paraffin dispersion - Google Patents

Abstract

Paraffinic dispersion refers to the production of paraffinic dispersion in water, usable in the wood, leather and paper industries. The essence of the invention is the use of a mixture of higher paraffinic hydrocarbons in the form of gaches to produce a stable dispersion that does not require further adjustment of the rheological properties.

Description

247331

BACKGROUND OF THE INVENTION The present invention relates to a paraffin dispersion in water suitable for the hydrophobization of agglomerated slabs, used in the leather, textile and paper industries. In the manufacture of agglomerated boards, i.e. wood fiber or particle boards, in the leather, textile and paper industries, paraffin is used as the hydrophobic agent, ie a mixture of saturated paraffinic hydrocarbons, ie n-alkanes. , the molten paraffin prevents the plates from sticking to the metal press plates and acts as a hydro-phobic agent for the use of the plates. In the production of chipboard, the melted paraffin in the emulsifier is dispersed in water together with the emulsifier to disperse the desired concentration. In order to form a stable dispersion, the pH of the medium is adjusted by the pH of the liquor, typically to pH 7. The paper or textile emulsion is prepared by the same method.

The aqueous dispersion is prepared from the economical inquiries only at the processor and a minimum of 24 hours stability is required to ensure uniformity of dosage. The sparge is conventionally prepared by emulsifying paraffin in water using anionic or non-ionic emulsifiers. Not only the surfactants, but also the environment, contribute to the stability of the paraffin dispersion in water. The dispersion viscosity will affect the concentration in the mixture. With increasing concentration of saturated paraffinic hydrocarbons, the viscosity of the dispersion and the degradability of the system are increased. Solubilizers, dispersants or mineral oils having a viscosity of 8 to 27 mm 2 are used to modify the system properties. sec-1 in an amount of up to 15 wt. The added oil acts as a solubilizer.

A disadvantage in the prior art of preparing paraffinic dispersions! there is a lack of stability and high viscosity of the dispersion, it is necessary to strictly adhere to the preparation conditions in which they are stable, i.e., temperature, quantity, manner and speed of mixing, it is necessary to additionally modify their theological properties by physical means, e.g. .in the oil mill, or mineral oil for liquefaction.

Disadvantages of the preparation of dispersions by the prior art, i.e. insufficient stability, or the adaptability of the rheological properties by the addition of an additional agent, i.e., oil, thereby increasing the time-consuming time, can be eliminated by preparing the dispersion of the invention. The dispersion according to the invention consists of a mixture of higher paraffinic hydrocarbons produced from distillation oil fractions or selective oil raffinates with an oil content of max. 20% by weight, with a solidification point of 48 to 62 ° C and a flash point of 175 to 250 ° C, in an amount of from 20 to 65 wt.%, 2 to 13 wt. % emulsifier and 33-78 wt. water.

Said amounts of emulsifiers refer to conventional commercial network products as a 3 to 50% solution of the active ingredient in the solvent.

According to the use of the dispersion, gelling agents, i.e. higher paraffinic hydrocarbons produced by dewaxing distillate oil fractions, or selective oil grains with an oil content of up to 20% by weight, a pour point of from 48 to 62 ° C, and a flash point of 170 to 250 ° C may be used. it is important in the final treatment of the agglomerated die in a press where the press temperatures are up to 180 ° C and at this point a flashing point above 200 ° C is preferred. A applicator, i.e. a mixture of higher paraffinic hydrocarbons with the following properties, is possible:

Pour point ° C% wt. Flash point 48 to 54 15 180 to 186 52 to 56 20 200 to 215 54 to 62 20 212 to 250 The advantage of the dispersion according to the invention is a stable, fine dispersible dispersion with lower production costs without the need for additional adjustmentsTeological properties by physical or oil addition. EXAMPLES Example 1 40 wt. % (freezing point 48 ° C, oil content 15%, flash point 195 ° C), 55% by weight; % water, 5 wt. emulsifier (sodium alkyl benzenesulfonic acid salt). Dissolve (60 ° C) in the reaction flask and add heated water (60 ° Celsius) with the emulsifier dissolved while stirring to form a stable fine dispersion. % (solidification point 58 CC, 242 ° C flash point and 19.8 wt.% oil content), 55 wt. % water, 3 wt. nonionic surfactant (produced by co-polymerization of propylene glycol with ethylene oxide). Dissolve (60 ° C) in the reaction flask and add water heated to 60 ° C with the semulgator while stirring. Stirring results in a stable, fine dispersion.

Claims (1)

SUBJECT A paraffinic dispersion in water, with good stability and excellent rheological properties, suitable for hydrophobization of agglomerated boards in the woodworking industry, well usable in the leather and textile industry, characterized in that it consists of slacks, i. j. mixtures of higher paraffinic hydrocarbons, made from distillate oleaginous fractions, or selective oil raffinates with an oil content of max. 20 wt. with a pour point of 48 to 62 ° C and a flash point of from 175 to 250 ° C, in an amount of from 20 to 65% by weight, preferably 42% by weight, 2 to 13% by weight. % of an emulsifier, preferably 3 wt. and 33 to 78 wt. water, preferably 55 ° / wt.