CS242203B1 - A method of preparing a stable aqueous emulsion of a hydrophilic petroleum resin - Google Patents

Abstract

The invention provides a method for preparing a stable emulsion based on hydrophilic petroleum resin, especially with a high specific gravity. The essence of the solution lies in the homogenization of a mixture of hydrophilic petroleum resin, emulsifier and alkali metal hydroxide or monoethanolamine in the presence of a solvent consisting of a hydrocarbon or a mixture of hydrocarbons with a boiling point of 70 to 350 °C in an amount of 3 to 50 wt. % of the weight of the hydrophilic resin. From the concentrate prepared in this way, by dilution with water at a temperature of 60 to 130 °C, stable emulsions can be prepared, which are used in the process of polymer production and in the paper industry.

Description

The present invention provides a process for the preparation of a stable hydrophilic petroleum resin emulsion, especially of high specific gravity.

The essence of the solution consists in homogenizing a mixture of hydrophilic petroleum resin, emulsifier and alkali metal hydroxide or monoethanolamine in the presence of a hydrocarbon solvent or a mixture of hydrocarbons boiling at 70 to 350 ° C in an amount of 3 to 50% by weight. by weight of hydrophilic resin. From the concentrate thus prepared, emulsions can be stably prepared by dilution with water at a temperature of 60 to 130 ° C, which are used in the polymer production process and in the paper industry.

The present invention provides a process for preparing a stable hydrophilic petroleum resin emulsion.

Emulsifiers and bases are used as excipients to prepare emulsions of petroleum resins modified with polar hydrophilic groups, usually carboxyl groups. The most commonly used emulsifier is tall oil, rosin or fatty acid, the basic component being sodium, potassium or ammonium hydroxide (Pozyrev SS et al., Bumaz. Prom. 3, 17 1976, Jap. Pat. 32,762 (1970), 11,446 ( 1971), English Pat 986 616, Austrian Pat 347 679). However, only these substances are often insufficient to prepare stable aqueous emulsions if the hydrophilic petroleum resins have a softening point above 100 ° C or a specific gravity above 1100 kg. m ³ .

The above drawbacks are overcome by the preparation of a stable hydrophilic petroleum resin emulsion by homogenizing a mixture of hydrophilic petroleum resin, emulsifier and monoethanolamine or a concentrated aqueous alkali metal hydroxide solution at a temperature of 60 to 130 ° C, characterized in that homogenization occurs in the presence of a solvent consisting of % of hydrogen sulphide or mixtures of hydrocarbons boiling at normal pressure in the temperature range of 70 to 350 ° C in an amount of 3 to 50 wt. by weight of bitumen. The concentrated emulsion thus prepared is diluted with 0.1 to 40 wt. water at a temperature of 60 to 130 ° C and after formation of the oil-in-water emulsion is diluted to the desired concentration with an additional amount of water at a temperature of up to 59 ° C.

A hydrophilic petroleum resin having an acid number of 10 to 150 mg KOH can be used to prepare stable emulsions. g ^-1 . Various ionogenic or non-ionic types with HLB values of 11 to 17 are used as auxiliary emulsifiers. Their amount is usually 3 to 20% by weight. calculated on the weight of the petroleum resin. The base most commonly is sodium hydroxide, potassium hydroxide or monoethanolamine. Their amount is determined by the acid number of the petroleum resin and the type of emulsifier.

When using hydrophilic petroleum resins with a specific gravity of less than 1100 kg. m ³ it is preferable to use more volatile hydrocarbons such as toluene, benzene, which evaporate in the preparation and are used after condensation. For resins with a specific gravity above 1100 kilograms / m ³ , less volatile hydrocarbons are preferably used to adjust the specific gravity of the resin / emulsifier / hydrocarbon mixture to the specific gravity of the aqueous solution of the basic component. The advantages of the process for preparing aqueous emulsions by the process of the invention can be seen from the following examples.

EXAMPLE

K 50 wt. % hydrophilic petroleum resin with an acid number of 32.7 mg KOH. g ^-1 with a softening temperature of 110 ° C is added 5 wt. parts by weight of an emulsifier based on ethylene glycol and olein (Slovasol 6,018) (HLB = 15) and 5 wt.

parts of toluene. The mixture was homogenized at 100-110 ° C and then 8 parts of potassium hydroxide as a 50% aqueous solution were added with stirring at the same temperature. 100 wt. parts of water at a temperature of 80 to 100 ° C. The resulting concentrated emulsion is diluted while being cooled by the addition of 400 wt. parts of cold water. The emulsion prepared by this procedure is stable for more than 6 months.

Example 2

K 50 wt. 5 parts by weight of hydrophilic petroleum resin of the same composition as in Example 1 are added. parts of an emulsifier based on olein and polyethylene glycol (Slovasol 0) with HLB values of 16 and 8 wt. parts of potassium hydroxide in the form of a concentrated aqueous solution (50% by weight). The mixture is homogenized at 100-110 ° C and 5 wt. parts of methylcyclohexane. Concentrated in this way! the emulsion can be diluted with water such that the resulting emulsion is stable for at least a year.

Example 3 wt. parts of a hydrophilic petroleum resin having an acid number of 41.1 mg KOH. g ^-1 , a softening temperature of 120 ° C and a specific gravity of 1115 kilograms / m ³ are homogenized with 5 wt. parts of propylene oligomers having a boiling point of 182 to 235 ° C at 110 to 120 ° C. Subsequently, 10 wt. parts by weight sodium hydroxide (50% solution) and 5 wt. parts of tall oil and the whole mixture is homogenized. After addition of 100 wt. 80 ° C hot water and 500 wt. parts of cold water to form an emulsion with a stability of more than three months.

Example 4

K 50 wt. % of petroleum resin having an acid number of 17.2 mg KOH. g ^-1 and a maceration temperature of 55 ° C are added 4 wt. parts of the xylene fraction. A mixture consisting of 3 wt. parts of tall oil, 5 wt. parts by weight of monoethanolamine and 1 wt. works of the xylene fraction. The homogenization is carried out at a temperature of 45 to 55 ° C. After addition of 50 wt. parts of water at a temperature of 60 to 80 ° C and 500 wt. parts of cold service water produces an emulsion with a stability of at least 6 months.

Example 5

K 100 wt. % hydrophilic petroleum resin with an acid number of 32.6 mg KOH. g ^_1 was added 8 wt. parts of toluene, 4 wt. parts of tall oil, 16 wt. parts of KOH and 16 wt. parts of water. The whole mixture is homogenized at 100-120 ° C. Homogenization at this temperature should take at least 10 minutes.

The concentrated V / O emulsion thus prepared can be converted into a diluted O / V type emulsion of 2420203 even after 6 months of preparation by reheating to a temperature of 90 to 120 ° C and adding 200 wt. parts of water at 60-100 ° C and then cold water up to the desired emulsion concentration.

The hydrophilic petroleum resin emulsions thus prepared are used in polymer production processes or in the paper industry.

Claims (1)

Even after 6 months after preparation, the O / V type was heated to 90 DEG to 120 DEG C. and 200 wt. 60 to 100 ° C and then cold water until the desired emulsion concentration. The emulsions of hydrophilic petroleum resin thus prepared are used in the polymer or paper industry processes. PEEDMET A process for preparing a stable aqueous emulsion of a hydrophilic petroleum resin by homogenizing a mixture of a hydrophilic petroleum resin, an emulsifier and a monoethanolamine and / or a concentrated aqueous alkali hydroxide solution at a temperature of 60 to 130 ° C, wherein the homogenization takes place in the presence of a solvent consisting of a hydrocarbon solvent or a mixture of hydrocarbons with a boiling point at a normal pressure of 70 to 350 ° C in an amount of 3 to 50% by weight. from the weight of the resin, water is added in an amount of 0.1 to 40% by weight. from a resin weight of 60-130 ° C, and after the oil-in-water emulsion has been formed, it is diluted with an additional amount of water to 59 ° C to the desired concentration.