Method of preparing paraffin wax emulsion for making wood chipboards

FIELD: chemistry.

SUBSTANCE: method of preparing a paraffin wax emulsion involves preparation of a pre-emulsion by mixing a molten mixture of paraffin wax, mineral oil in concentration of 2.0-6.0 wt % of the emulsified mixture, an emulsifying agent in concentration of 3.0-8.0 wt % of the emulsified mixture and water. The mixture is stirred at 70-75°C for 15-25 minutes. Subsequent dispersion of the pre-emulsion is carried out in a hydrodynamic disperser at 70-75°C until an emulsion with average size of paraffin wax particles less than 1 mcm is obtained. The obtained emulsion is then cooled to temperature not over 25°C, held for 1 day and filtered. The paraffin wax mixture contains petroleum wax C18-C35 of the methane family with melting point of 45-65°C and C36-C55 isomeric structure with dropping point of 55-66°C with weight ratio of 90:10-10:90. The emulsifying agent used is non-ionic, anionic surfactants, a composition based on a mixture of stearin and/or stillage bottoms from production of fatty acids, esters of polyoxyethylated fatty alcohols and acids and an amine in weight ratio 1:1.0-1.5:1.0-1.5:0.5-1.0.

EFFECT: method enables to obtain paraffin was emulsion with high content (more than 60 wt %) of paraffin wax, which is stable for a long period of storage.

3 cl, 3 ex

 

This invention relates to chemical technology, namely the method of obtaining stable during prolonged storage of paraffin emulsions with a high content (up to 70%) petroleum waxes. The solution of these problems at the forefront raises questions about the availability and properties (structure and hydrophilic-lipophilic balance (products HLB)) emulsifier used, its concentration and of emulsification method.

In respect of the surfactant used as an emulsifier in the patent and scientific and technical literature notes the applicability of any type: anionic, cationic, nonionic and amphoteric, the most preferred is the use of nonionic and anionic surfactants.

Methods of emulsification of the wax to get the paraffin wax include mechanical emulsification and the emulsification method of treatment phases, the combination of these two methods. Mechanical emulsification includes methods that use mixed homogenizers, valve homogenizers, colloid mills and ultrasonic homogenizers. It is noted that the emulsion is not critical and a key indicator of its effectiveness is the uniformity of the emulsion and its stability during storage. Emulsification is carried out at a temperature of 10-50°C above the melting temperature of the paraffin within 0.5 is about 3 hours.

The paraffin wax in recent years are widely used as components of water-repellent composition for the production of chipboards, water-resistant gypsum compositions, water-resistant concretes, oiling agents in the production of fiberglass and other fields.

A method of obtaining a water-repellent composition for wood-based materials, including paraffin emulsion and water-soluble synthetic polymer (US 4407999 And 04.10.1983).

Paraffin emulsion is obtained on the basis of paraffin with a melting point in the range of 50-70°C and oxidized paraffin wax with a melting point in the range of 40-80°C and an acid number of 20 to 45 mgKOH/g Emulsion contains 50-97 parts of paraffin and 3-50 parts of oxidized paraffin. Emulsifying component of the paraffin wax is a surface-active substance (surfactant), water-soluble compound of an alkali metal or a mixture. Perhaps the use of anionic, cationic, nonionic and amphoteric surfactants. Emulsification is carried out with the use of mixer-homogenizer, valve homogenizer, colloid mill, ultrasonic generator, or any other mechanical method of emulsification method and also the treatment phase at a temperature of 10-50°C above the melting temperature of the paraffin wax and oxidized wax for 10-180 minutes. In concr is the shaft the examples of the preparation of paraffin emulsion according to this invention as emulsifying components used sodium hydroxide, alerby ether of polyoxyethylene, sucrose palmitate, ethoxylated hexadecylamine monoglyceride, sucrose stearate, emulsification was carried out at a temperature of 80°C. and under vigorous stirring in a homogenizer. Received paraffin emulsion with a solids content of 40.9-45,8%. The stability of the emulsion was controlled in a mixture of 10 parts of paraffin wax with 90 parts of adhesive resin. It is shown that during storage in tall glasses, the concentration of solids in the lower and upper parts of the glass practically does not change, does not change the viscosity of the mixture during storage for up to 336 hours (14 days).

In U.S. patent No. 4.042.409 And from 16.08.1977 g) described water-resistant gypsum composition, which uses paraffin wax obtained from a mixture of paraffin wax and oxidized wax, taken in the ratio of from 97:3 to 50:50, in the presence of water-soluble bases, alkali metal or ammonium and nonionic emulsifier. The amount of the alkaline compound should be sufficient to neutralize 30-70% acidity oxidized paraffin. With insufficient or excessive quantity of alkali impossible emulsification of the wax method of treatment phases or receive emulsion with low stability. Usually paraffin emulsion obtained using 10-20% of emulsifier, and only use okilan the th paraffin allows to obtain a stable emulsion with a content of 5 parts emulsifier per 100 parts of a mixture of paraffin wax and oxidized wax. Used emulsifiers and methods of emulsification similar to that shown in U.S. patent No. 4.407.999 discussed above.

The disadvantages of the two considered inventions include mandatory use of oxidized paraffin, which requires the production of technically sophisticated technological stage and considerably increases the cost of paraffin emulsion. Moreover, in Russia there are currently no installation oxidation of paraffin.

Closest to the proposed is a method for paraffin wax for the production of water-resistant chipboard (Canadian patent CA 2.547.751 A1, 20.11.2006), including water, lignosulfonic acid or its salt and at least one wax selected from the group comprising paraffin GAC, paraffin wax and Montan wax. Paraffin emulsion may contain two wax, such as paraffin wax and Montan wax (lignite wax or paraffin GAC (a mixture of paraffin and more than 5 wt.% oil) and Montan wax. When receiving the paraffin wax used 30-60 wt.% water, 0.5-5.0 wt.% lignosulfonic acid or a salt thereof, 0.1 to 1.0 wt.% potassium hydroxide, 40,0-50,0 wt.% paraffin, gacha or mixtures thereof, 0.1 to 10.0 wt.% Montan-wax, 0.1 to 5.0 wt.% polyvinyl alcohol. The solids content in paraffin emulsion in accordance with PR is maintained examples was 50-58 wt.%. Emulsification was carried out in a colloid mill.

The disadvantages of this method include not high enough concentration of paraffin emulsion and its stability during storage and use in the formulation of such critical materials as Montan wax, lignosulfonic acid and polyvinyl alcohol. Use as a device for emulsification of the colloid mill requires a long time of emulsification.

The present invention is the elimination of the above disadvantages and to develop ways to obtain highly concentrated paraffin emulsion (concentration of paraffin wax to 70 wt.%), stable when stored.

To solve the problem proposed by the present method of obtaining a paraffin emulsion, comprising obtaining predementia by melt mixing a mixture of paraffin wax containing petroleum waxes18-C35mainly methane series with a melting temperature of 45-65°C and36-C55mainly isomeric structures with temperatures dropping 55-66°C, taken in a mass ratio of 90:10-10:90, mineral oils, emulsifier and water at a temperature of 70-75°C for 15-25 min, the subsequent dispersion of predementia in hydrodynamic dispersant at a temperature of 70-75°C. to obtain an emulsion with the average particle size of paraffin wax less than 1 μm, cooling the resulting emulsion to a temperature not exceeding 25°C, exposure for 1 day and filtration. According to the present method, the concentration of mineral oil in emulsifiable mixture is 2.0 to 6.0 wt.%. Use mineral oil in an amount sufficient to achieve concentrations to the above values. As the emulsifier used is available commercially available surfactants nonionic and anionic types, compositions based on a mixture of stearin and/or bottoms or soap stock production of fatty acids, esters polyoxyethylene fatty alcohols and acids, and amines, taken in the mass ratio 1:1,0-1,5:1,0-1,5:0,5-1,0 (products HLB emulsifier within 10-12). The concentration of the emulsifier emulsifying the mixture is 3-8 wt.%. This method involves the introduction of more at the stage of obtaining predementia 0.1-2.0 wt.% polysiloxane defoamer, resulting in an additional technical effect is to give the paraffin wax additional hydrophobic properties.

The resulting wax emulsion is a liquid from milky-white to light beige color and is characterized by the following properties: organic matter content up to 70 wt.%, the particle size of the wax is less than 1 μm, the solubility in water - neahr is reduced, pH 8.5±1, the viscosity B3 246 with nozzle 4 mm 20±10 seconds, a density of 0.93±0.2 g/cm3stability during storage is more than 30 days prior to the separation.

The production of paraffin emulsion is carried out by the following technological scheme: the melt mixture of paraffin waxes, taken in a mass ratio of heated containers fed into the reactor with heating and anchor stirrer, in the same reactor served mineral oil in the required amount, emulsifier, defoamer, water (steam condensate or softened tap water, prepared using a special system of preparation and purification), the mixture was stirred in the reactor for 15-25 minutes at a temperature of 70-75°C, the resulting predementia from the bottom of the reactor is pumped at the same temperature in the hydrodynamic disperser, which comes to the intermediate tank with a stirrer, of which the emulsion is pumped to the cooling in the heat exchanger where it is cooled to a temperature not exceeding 25°C and flows into the intermediate tank, where it is aged for at least 24 hours. After soaking for days at 20-25°C. the emulsion is filtered through a cartridge or frame filter and forward in the capacity of commercial products.

Organized circulation system for a reactor → pump → hydrodynamic dispersant → premiato the Naya capacity provides multiple repetition of dispersion (2-5 pumping cycles) to ensure the required quality of the emulsion, which is controlled by the particle size of the paraffin wax in the emulsion by the method of laser correlation spectroscopy, which must be less than 1.0 micron.

Paraffin emulsion produced in accordance with the present invention, tested with positive results on the number of enterprises in the production of chipboard.

The following examples illustrate the present invention.

Example 1.

In a reactor with a stirrer and heated from pravilnikov served a total of 500 kg of paraffin wax, taken in the mass ratio of the wax (C18-C35(melting point 46°C)/ wax36-C55(dropping temperature 61°C)equal to 50/50, 40 kg of oil I (industrial oil), 40 kg of the composition of emulsifiers consisting of stearic acid, polietilenglikoli ester of stearic acid, a mixture of polyethylene glycol ethers of fatty alcohols With16-C20and triethanolamine in the ratio of 1:1,4:1,4:0,7, and 380 kg softened tap water. The mixture is stirred at a temperature of 75°C for 20 min to obtain predementia. Then start pumping predementia from the reactor through hydrodynamic dispersant in the intermediate tank with agitator. Spend 3 cycles of pumping scheme reactor → dispersant → the intermediate tank. The emulsion is cooled in the heat exchanger to 25°C, incubated in tanks 24 hour filtered through a cartridge filter and sent to the capacity of commercial products. The resulting emulsion contains about 62 wt.% organic matter, particle size paraffin waxes, determined by laser correlation spectroscopy, of 0.75 μm, the viscosity B3 246 with nozzle 4 mm - 23 seconds, a density of 0.94 g/cm3pH of 8.6. When storing the sample of the emulsion within 50 days of stratification does not occur.

Example 2.

Paraffin emulsion receive analogously to example 1. The difference lies in the fact that, as the composition of the emulsifiers used 40 kg of a mixture of stearic acid and triethanolamine in a ratio of 1.4:1 and spend 5 pumping cycles through hydrodynamic disperser. The resulting emulsion contains about 62 wt.% organic matter, particle size paraffin waxes of 0.9 μm, the viscosity B3 246 with nozzle 4 mm - 33 seconds, a density of 0.95 g/cm3, pH 8.1. When storing this sample emulsion delamination is observed after 10 days.

Example 3.

Paraffin emulsion receive analogously to example 1. The difference is that at the stage of obtaining predementia in a mixture of paraffin waxes, emulsifying composition, mineral oil and water also add 2 kg of siloxane antifoam. You get a paraffin emulsion, the properties are identical obtained in example 1, but additionally has raised the Oh hydrophobic efficiency, which is manifested in the decrease of the degree of swelling of chipboards when tested for water resistance.

1. The method of obtaining the paraffin wax for the production of chipboards, including obtaining predementia by melt mixing a mixture of paraffin wax containing petroleum waxes C18-C35methane series with a melting temperature of 45-65°C and36-C55isomeric structures with temperatures dropping 55-66°C, taken in a mass ratio of 90:10-10:90, mineral oil at a concentration of 2.0 to 6.0 wt.% for emulsifying the mixture, emulsifier at a concentration of 3.0-8.0 wt.% by emulsifying a mixture of water and at a temperature of 70-75°C for 15-25 min, followed by dispersing predementia in hydrodynamic dispersant at a temperature of 70-75°C. to obtain an emulsion with an average particle size of paraffin wax less than 1 μm, cooling the resulting emulsion to a temperature not exceeding 25°C, exposure for 1 day and filtering.

2. The method according to claim 1, characterized in that the emulsifier used nonionic, anionic surfactant composition based on a mixture of stearin and/or bottoms of the production of fatty acids, esters polyoxyethylene fatty alcohols and acids, and amine in a weight ratio of 1:1,0-1,5:1,0-1,5:0,5-1,0.

3. The method according to claim 1, characterized in that at the stage of obtaining Predeal which these impose additional 0.1-2.0 wt.% polysiloxane defoamer.



 

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