CN115445253A - Pickering type higher fatty alcohol emulsion defoaming agent and preparation method thereof - Google Patents

Abstract

The invention relates to a pickering type higher fatty alcohol emulsion defoaming agent and a preparation method thereof, belonging to the technical field of defoaming agent emulsification. Comprises the following components: the dosage of the higher fatty alcohol accounts for 25 to 30 percent of the total mass of the emulsion; solid particles, the dosage of which accounts for 0.1 to 5 percent of the total mass of the emulsion; stabilizer, the amount of which accounts for 0.1-1% of the total amount of the emulsion; the amount of the thickening agent accounts for 0.1 to 1 percent of the total amount of the emulsion; the others are water. The defoaming agent is obtained by adopting the solid particles and adding a small amount of the stabilizing agent and the thickening agent, the preparation process is simple, the traditional surfactant is hardly added, and the prepared high-grade fatty alcohol emulsion has good stability and high defoaming efficiency.

Description

Pickering type higher fatty alcohol emulsion defoaming agent and preparation method thereof

Technical Field

The invention relates to a pickering type higher fatty alcohol emulsion defoaming agent and a preparation method thereof, belonging to the technical field of defoaming agent emulsification.

Background

In the production processes in the fields of pulping and papermaking, food fermentation, wastewater treatment, textile printing and dyeing, petrochemical industry and the like, a large amount of foam exists, and the production efficiency and the product quality are seriously influenced. In order to eliminate excessive foam and improve production efficiency, defoaming and foam inhibitor are necessary. Studies have shown that the most effective way to control foam is to add chemical aids that prevent foam formation or eliminate foam.

Chemical aids that have been used as antifoam and foam-suppressing components include a wide variety of oils such as silicone oils, mineral oils, triglycerides, fluorocarbons, and the like; some adopt hydrophobic particle defoaming and foam inhibiting, such as hydrophobic white carbon black, calcium soap, wax, plastic particle, etc.; some adopt oil and hydrophobic particle mixed system to make defoaming/foam inhibitor; also, defoaming properties can be achieved by using a wide variety of amphiphilic molecules, such as alcohols, fatty acids and fatty lipids, and some special polymers with partial solubility.

Compared with the prior polyether defoaming agent and organic silicon defoaming agent, the higher fatty alcohol water emulsion defoaming agent has the following advantages: 1. the sizing agent is not easy to be mixed into papermaking paper to form spots, the addition amount of the sizing agent is reduced, and the quality of the paper is improved; 2. the water-soluble organic fertilizer is easy to be uniformly dispersed in white water and is not easy to form precipitates with inorganic matters; 3. excellent defoaming performance at high temperature; 4. the price is relatively low.

US5807502 discloses an emulsion defoamer comprising a C10-C28 fatty alcohol, an anionic surfactant and an adduct of ethylene oxide with a C6-C18 fatty alcohol, the emulsion defoamer being capable of producing an emulsion having a viscosity which changes over time. US4009119 discloses an aqueous defoamer comprising a combination of long carbon chain fatty alcohols, fatty acids, esters of fatty acids with di-or trihydric alcohols and liquid paraffin. CN103830937 discloses an emulsion fatty alcohol antifoaming agent composed of natural fatty alcohol, fatty acid ester, organic hydrocarbon substance. CN101718055 discloses an emulsified high-carbon alcohol defoaming agent consisting of high-carbon alcohol, fatty acid ester and low-melting-point grease. CN107059474A discloses a high alcohol defoamer, which consists of rice bran wax, alkane or vegetable oil, surfactant, bactericide and water, wherein the rice bran wax is an active ingredient of the defoamer; however, the components of the product are too complex, the requirement on the emulsification process is high, the viscosity change is large, and the phenomenon of paste forming is easy to occur. CN109432830A discloses a preparation method of a high-temperature defoamer for a high-carbon alcohol body, which comprises the steps of firstly taking high-carbon alcohol, mineral oil, fatty alcohol polyether polyol and polyether modified silicone oil as emulsified substances to obtain emulsion A, then carrying out emulsion compounding with emulsion B prepared from microcrystalline wax, and stirring at the temperature of more than 180 ℃ to obtain final emulsion; however, the emulsion product has high viscosity, poor dispersibility and high tendency to form paste. CN107137959B discloses the preparation of separately emulsified fatty alcohol emulsions, oil emulsions, paraffin emulsions, and finally the compounding of the three emulsions into the final emulsion to improve the stability of the emulsion, but the defoaming and foam suppressing properties of the product need to be improved.

In summary, a surfactant is often used to emulsify fatty alcohol and to obtain a stable antifoaming agent emulsion. Because a large amount of surfactant is introduced in the preparation process, the probability of foam formation is increased undoubtedly in production and use.

Disclosure of Invention

The Pickering emulsion is an emulsion obtained by taking ultrafine solid particles as an emulsifier, has the characteristics of low cost, good biocompatibility, stable emulsion and the like, is widely concerned, and can be used as a special emulsion to adsorb the solid particles as a stabilizer on two incompatible oil-water interfaces. The invention provides a preparation method of a pickering type higher fatty alcohol emulsion defoamer, which does not use a surfactant, and the obtained pickering type emulsion defoamer has better defoaming, foam inhibiting and stabilizing properties.

A pickering type higher fatty alcohol emulsion defoaming agent comprises the following components:

the dosage of the higher fatty alcohol accounts for 25 to 30 percent of the total mass of the emulsion;

solid particles, the dosage of which accounts for 0.1 to 5 percent of the total mass of the emulsion;

stabilizer, the amount of which accounts for 0.1-1% of the total amount of the emulsion;

the amount of the thickening agent accounts for 0.1 to 1 percent of the total amount of the emulsion;

the others are water.

Preferably, the higher fatty alcohol is one or more of C16, C18, C20 and C22 fatty alcohols.

Preferably, the solid particles are nano-silica and/or nano-calcium silicate.

Preferably, the thickening agent is one or more of guar gum, carboxymethyl cellulose, alginic acid and chitosan.

Preferably, the stabilizer is PVP and/or PEO.

The preparation method of the pickering type higher fatty alcohol emulsion defoaming agent comprises the following steps:

(1) Adding higher fatty alcohol, solid particles, a stabilizer and a thickening agent into a container in proportion, heating to 70-90 ℃, preserving heat, and stirring to uniformly mix the higher fatty alcohol, the solid particles, the stabilizer and the thickening agent;

(2) Slowly adding water at 70-90 deg.C into the mixture;

(3) Emulsifying the mixture by a high-shear emulsifying machine;

(4) And cooling to room temperature to obtain the defoaming agent.

The solid particles are used for being adsorbed on the interface of the liquid drop of the fatty alcohol emulsion and stabilizing the liquid drop, so that stable emulsion is obtained; the solid nano particles have strong hydrophilicity, can not be used independently to obtain stable fatty alcohol emulsion, and are added with a stabilizer to assist in obtaining stable emulsion; in order to maintain the emulsion in a uniform and stable suspended state or an emulsified state for a long time and to increase the storage time, a small amount of a thickener is added.

The invention has the beneficial effects that:

the invention obtains the defoaming agent by adopting the solid particles and adding a small amount of the stabilizing agent and the thickening agent, has simple preparation process, hardly adds the traditional surfactant, and prepares the high-grade fatty alcohol emulsion with good stability and high defoaming efficiency.

Detailed Description

The present invention will be further described with reference to the following specific examples; unless otherwise indicated, the parts are by mass in the examples.

Example 1

Adding 20 g of hexadecanol, 10 g of octadecanol, 0.1 g of nano-silica, 0.1 g of PVP and 0.1 g of guar gum into a container, heating to 70 ℃, adding 69.7 g of 70 ℃ water after uniformly stirring, emulsifying for 1 min through high-speed shearing at 10000 r/min, then increasing the rotating speed to 12000 r/min, adding the rest water, continuing to emulsify for 5 min, cooling to obtain a pickering type high-grade fatty alcohol emulsion, standing the emulsion for 48 h without obvious change, and measuring the viscosity to be 468 mPa.s.

Example 2

Adding 10 g of hexadecanol, 20 g of behenyl alcohol, 0.5 g of nano silicon dioxide, 0.5 g of PVP and 0.5 g of alginic acid into a container, heating to 80 ℃, stirring uniformly, adding 68.5g of 80 ℃ water, emulsifying for 1 min by high-speed shearing at 10000 r/min, then increasing the rotating speed to 12000 r/min, adding the rest water, continuing to emulsify for 5 min, cooling to obtain a pickering type high-grade fatty alcohol emulsion, standing the emulsion for 48 h without obvious change, and measuring the viscosity to 283 mPa.s.

Example 3

Adding 15 g of octadecanol, 15 g of eicosanol, 0.2g of nano-silica, 0.3g of nano-calcium silicate, 0.5 g of PEO and 0.5 g of guar gum into a container, heating to 80 ℃, adding 68.5g of water at 80 ℃ after uniformly stirring, emulsifying for 1 min through high-speed shearing at 10000 r/min, then increasing the rotating speed to 12000 r/min, supplementing the rest water, continuing to emulsify for 5 min, cooling to obtain the pickering type high-grade fatty alcohol emulsion, standing the emulsion for 48 h without obvious change, and determining the viscosity to be 215 mPa.s.

Example 4

Adding 15 g of hexadecanol, 15 g of octadecanol, 1 g of nano-silica, 1 g of PEO and 1 g of guar gum into a container, heating to 80 ℃, stirring uniformly, adding 67 g of water at 80 ℃, emulsifying for 1 min by high-speed shearing of 10000 r/min, then increasing the rotating speed to 12000 r/min, adding the rest of water, continuing to emulsify for 5 min, cooling to obtain a pickering type high-grade fatty alcohol emulsion, standing the emulsion for 48 h without obvious change, and determining the viscosity to be 183 mPa.s.

Example 5

Adding 15 g of hexadecanol, 15 g of octadecanol, 1 g of nano calcium silicate, 1 g of PEO and 1 g of carboxymethyl cellulose into a container, heating to 85 ℃, uniformly stirring, adding 67 g of water with the temperature of 85 ℃, emulsifying for 1 min by high-speed shearing at 10000 r/min, then increasing the rotating speed to 12000 r/min, adding the rest of water, continuing to emulsify for 5 min, cooling to obtain a pickering type high-grade fatty alcohol emulsion, standing the emulsion for 48 h without obvious change, and determining the viscosity to be 175 mPa.s.

Comparative example 1 non-reinforced solid particles provided with reference to example 4

Adding 15 g of hexadecanol, 15 g of octadecanol, 1 g of PEO and 1 g of guar gum into a container, heating to 80 ℃, uniformly stirring, adding 68 g of water at 80 ℃, emulsifying for 1 min by high-speed shearing of 10000 r/min, then increasing the rotating speed to 12000 r/min, adding the rest of water, continuing to emulsify for 5 min, cooling to obtain a pickering type high-grade fatty alcohol emulsion, and standing the emulsion for 48 h to form paste.

Comparative example 2 No stabilizer was added as set forth in reference example 4

Adding 15 g of hexadecanol, 15 g of octadecanol, 1 g of nano-silica and 1 g of guar gum into a container, heating to 80 ℃, uniformly stirring, adding 68 g of 80 ℃ water, emulsifying for 1 min by high-speed shearing of 10000 r/min, then increasing the rotating speed to 12000 r/min, adding the rest water, continuing to emulsify for 5 min, cooling to obtain a pickering type high-grade fatty alcohol emulsion, and standing for 48 h to form the ointment.

Comparative example 3 No thickener set forth in reference to example 4

Adding 15 g of hexadecanol, 15 g of octadecanol, 1 g of nano-silica and 1 g of PEO into a container, heating to 80 ℃, uniformly stirring, adding 68 g of water at 80 ℃, emulsifying for 1 min by high-speed shearing at 10000 r/min, then increasing the rotating speed to 12000 r/min, adding the rest water, continuing to emulsify for 5 min, cooling to obtain a pickering type high-grade fatty alcohol emulsion, and standing the emulsion for 48 h to form paste.

Examples of the effects of the invention

The emulsions of examples 1 to 4 and comparative examples 1 to 3 were analyzed by adding 0.01 mL of the antifoaming agent of examples 1 to 4 and comparative examples 1 to 3 to 100mL of a 0.05% sodium dodecylbenzenesulfonate aqueous solution at room temperature using a circular bubbler, starting a flow pump, controlling the flow rate at 3L/min, and starting the test, and the results are as follows in table 1:

table 1 shows viscosity and foam volume results for defoamers of the present invention

While embodiments of the invention have been disclosed above, it is not intended to be limited to the details shown in the description and the examples, which are set forth, but are fully applicable to various fields of endeavor as are suited to the particular use contemplated, and further modifications will readily occur to those skilled in the art, since the invention is not limited to the details shown and described without departing from the general concept as defined by the appended claims and their equivalents.

Claims (6)

1. The pickering type higher fatty alcohol emulsion defoaming agent is characterized by comprising the following components:

the dosage of the higher fatty alcohol accounts for 25 to 30 percent of the total mass of the emulsion;

solid particles, the dosage of which accounts for 0.1 to 5 percent of the total mass of the emulsion;

stabilizer, the amount of which accounts for 0.1-1% of the total amount of the emulsion;

the amount of the thickening agent accounts for 0.1 to 1 percent of the total amount of the emulsion;

the others are water.

2. The pickering-type higher fatty alcohol emulsion antifoaming agent according to claim 1, wherein the higher fatty alcohol is one or more of C16, C18, C20 and C22 fatty alcohols.

3. The pickering type higher aliphatic alcohol emulsion antifoaming agent according to claim 1, wherein the solid particles are nano silica and/or nano calcium silicate.

4. The pickering type higher fatty alcohol emulsion antifoaming agent according to claim 1, wherein the thickener is one or more of guar gum, carboxymethyl cellulose, alginic acid, and chitosan.

5. The pickering-type higher fatty alcohol emulsion antifoaming agent according to claim 1, wherein the stabilizer is PVP and/or PEO.

6. A method for preparing a pickering type higher aliphatic alcohol emulsion antifoaming agent according to claim 1, comprising the steps of:

(1) Adding higher fatty alcohol, solid particles, a stabilizer and a thickening agent into a container in proportion, heating to 70-90 ℃, preserving heat, and stirring to uniformly mix the higher fatty alcohol, the solid particles, the stabilizer and the thickening agent;

(2) Slowly adding water at 70-90 deg.C into the mixture;

(3) Emulsifying the mixture by a high-shear emulsifying machine;

(4) And cooling to room temperature to obtain the defoaming agent.