CN112143322A - Formula and preparation method of high-self-leveling acrylic emulsion - Google Patents

Abstract

The invention discloses a formula of a high-self-leveling acrylic emulsion, which mainly comprises the following raw material components in parts by weight: 50-70 parts of deionized water, 3-5 parts of an emulsifier, 40-50 parts of butyl acrylate, 8-12 parts of isooctyl acrylate, 35-39 parts of methyl methacrylate, 1-3 parts of hydroxyethyl acrylate, 0.5-1.5 parts of a fluorocarbon monomer, 2-4 parts of acrylic acid, 1-3 parts of acrylamide, 0.25-0.75 part of an initiator, 0.25-0.75 part of a buffering agent, 20-30 parts of a polyacrylate emulsion, 2-4 parts of a water reducing agent, 4-6 parts of a defoaming agent, 1-3 parts of an anti-settling agent, 5-7 parts of a filler, 0.5-1.5 parts of an anti-corrosion bactericide, 1-2 parts of a leveling agent, 6-8 parts of a hydrophobic modified dispersing agent, 2-6 parts of a pH stabilizer and 3-5 parts of a thickening agent.

Description

Formula and preparation method of high-self-leveling acrylic emulsion

Technical Field

The invention relates to the technical field of self-leveling acrylic emulsion, in particular to a formula and a preparation method of high self-leveling acrylic emulsion.

Background

Self-leveling floor materials (SL) are building floor leveling materials which are developed in the 70 th century and are formed by mixing inorganic or organic cementing materials serving as base materials, additives such as superplasticizers and fine sand. The self-leveling material has the advantages of good fluidity and stability, simple and convenient construction, high speed, low labor intensity, smoothness, high strength, thin leveling layer thickness, good water resistance, acid resistance and the like, is an ideal material for paving the ground of large supermarkets, markets, parking lots, factory workshops, warehouses and the like, and is also a development direction of building ground construction.

The difference of the bearing requirements of the cement self-leveling mortar can be divided into; "bottom self-leveling", i.e. after it has dried, it serves as a support layer for various flooring materials, such as PVC flooring, carpet, wood flooring and floor tiles; the surface layer is correspondingly 'surface layer self-leveling', namely after the surface layer is dried and solidified, the surface layer can be used as a ground load layer without any coating. Compared with the self-leveling of the bottom layer, the self-leveling performance of the surface layer is higher, and the surface layer can be colored.

At present, with the increasing of labor cost of buildings year by year and the trend of delivery of house finishing, the market demand of the bi-component cement-based self-leveling mortar is remarkably increased. Factors influencing the leveling property of the bi-component self-leveling mortar are numerous, wherein the acrylic emulsion has the highest proportion in the additive mixing amount, has the greatest influence on the performance of the bi-component self-leveling mortar, and has higher requirements on the plasticizing speed of the additive in mechanical construction; therefore, the development of the high self-leveling acrylic emulsion is of great importance to improve the performance of the self-leveling mortar.

At present, the surfactant is the best method for improving the self-leveling of the acrylic emulsion, but besides the fluorocarbon surfactant, the mixing amount of other surfactants is high, so that the water resistance, the stain resistance and the wear resistance of the product are greatly influenced.

Therefore, the formula and the preparation method of the high-self-leveling acrylic emulsion with high stability, high self-leveling property, high flexibility and high shrinkage cracking resistance are very necessary.

Disclosure of Invention

The invention aims to provide a formula and a preparation method of a high-self-leveling acrylic emulsion, so as to realize the technical effects provided by the background technology.

In order to realize the purpose, the invention provides the following technical scheme: the formula of the high-self-leveling acrylic emulsion mainly comprises the following raw material components in parts by weight: 50-70 parts of deionized water, 3-5 parts of an emulsifier, 40-50 parts of butyl acrylate, 8-12 parts of isooctyl acrylate, 35-39 parts of methyl methacrylate, 1-3 parts of hydroxyethyl acrylate, 0.5-1.5 parts of a fluorocarbon monomer, 2-4 parts of acrylic acid, 1-3 parts of acrylamide, 0.25-0.75 part of an initiator, 0.25-0.75 part of a buffering agent, 20-30 parts of a polyacrylate emulsion, 2-4 parts of a water reducing agent, 4-6 parts of a defoaming agent, 1-3 parts of an anti-settling agent, 5-7 parts of a filler, 0.5-1.5 parts of an anti-corrosion bactericide, 1-2 parts of a leveling agent, 6-8 parts of a hydrophobic modified dispersing agent, 2-6 parts of a pH stabilizer and 3-5 parts of a thickening agent.

Preferably, the fluorocarbon monomer is a double-bond fluorocarbon monomer, and the fluorocarbon monomer is tridecafluorooctyl methacrylate or tridecafluorooctyl acrylate.

Preferably, the emulsifier is sodium dodecyl diphenyl oxide disulfonate and fatty alcohol-polyoxyethylene ether.

Preferably, the initiator is ammonium persulfate and the buffer is sodium bicarbonate.

Preferably, the defoaming agent is an organic silicon defoaming agent, the anticorrosion bactericide is a Kathon preservative, and the leveling agent is a fluorine-containing wetting leveling agent.

Preferably, the filler comprises one or more of glass fibers, carbon fibers and polypropylene fibers.

Preferably, the water reducing agent is one or a mixture of a sulfamate water reducing agent, an aliphatic water reducing agent, a polycarboxylic acid water reducing agent and a naphthalene water reducing agent.

Preferably, the hydrophobic modified dispersing agent is a hydrophobic modified carboxylic acid copolymer type sodium salt dispersing agent, the pH stabilizing agent is AMP-95, and the thickening agent is a hydrophobic modified polyurethane thickening agent.

Preferably, the anti-settling agent is hydroxyethyl methyl cellulose or fumed silica.

A preparation method of a high self-leveling acrylic emulsion formula specifically comprises the following steps:

the method comprises the following steps: preparation of the self-leveling additive: stirring and mixing the polyacrylate emulsion, the water reducing agent, the defoaming agent and the anti-settling agent for 0.5-1 h at the rotating speed of 800-1000 r/min; adding a filler into the mixed solution obtained in the first step, and mixing and stirring for 0.25-0.5 h to obtain a self-leveling additive;

step two: preparing a regulator: adding deionized water into a material preparation pot or a material preparation cylinder according to the formula amount, and placing the mixture under a high-speed dispersion machine; starting a high-speed dispersion machine, shifting to 300-500 r/min, stirring, uniformly adding the defoaming agent, the anti-corrosion bactericide, the leveling agent, the hydrophobic modified dispersing agent, the pH value stabilizer and the anti-settling slurry according to the formula amount, and stirring for 20-40 min to prepare a regulator;

step three: placing the self-leveling additive prepared in the step one and the regulator prepared in the step two in a thermocouple reaction kettle, keeping the temperature at 50-60 ℃, and continuously stirring for 1-2 hours to prepare a mixed additive;

step four: preparing a pre-emulsion: stirring and dissolving deionized water, sodium dodecyl diphenyl ether disulfonate and fatty alcohol-polyoxyethylene ether in a pre-emulsification kettle, then adding acrylamide, hydroxyethyl acrylate, acrylic acid, methyl methacrylate, butyl acrylate, isooctyl acrylate and tridecafluorooctyl methacrylate under stirring, and continuing stirring for 10-30 minutes to obtain a pre-emulsion;

step five: preparing an initiator solution: stirring and dissolving deionized water, ammonium persulfate and sodium bicarbonate to obtain initiator liquid;

step six: polymerization: adding deionized water, initiator liquid and pre-emulsion into a reaction kettle, heating to the reaction temperature of 80 +/-2 ℃, reacting for 20-40 minutes, then uniformly dropwise adding the rest of pre-emulsion and the rest of initiator liquid at the same time, completing dropwise adding the pre-emulsion within 2-4 hours, completing dropwise adding the initiator liquid within 3-4 hours, and preserving heat for 0.5-1.5 hours after completing dropwise adding; after the heat preservation is finished, the grafting monomer composition is dripped at the temperature, the grafting monomer composition is polymerized to obtain the required initiator liquid, dripping is finished for half an hour, after dripping is finished, heat preservation is carried out for 1-2 hours at the temperature, then the temperature is reduced to 40-60 ℃, and filtering and discharging are carried out, so that the acrylic emulsion is obtained;

step seven: and (4) adding the mixed additive prepared in the step six into the acrylic emulsion prepared in the step six, and uniformly mixing to obtain the finished product of the acrylic emulsion.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the formula and the preparation method of the high-self-leveling acrylic emulsion, the fluorocarbon surfactant of the fluorocarbon monomer can obviously reduce the surface tension of a solvent at an extremely low concentration. It has not only hydrophobic properties but also oleophobic properties. Due to the high surface activity performance, the acrylic emulsion has excellent performance in wetting and leveling, and the surfactant of the fluorocarbon monomer with double bonds is copolymerized with butyl acrylate, isooctyl acrylate, methyl methacrylate and hydroxyethyl acrylate, so that the acrylic emulsion cannot migrate, has good product stability and improves the self-leveling property of the acrylic emulsion.

2. According to the formula and the preparation method of the high self-leveling acrylic emulsion, the filler is arranged, the filler comprises fiber glass fibers, carbon fibers and polypropylene fibers with different length-diameter ratios, the fibers with different length-diameter ratios are mutually wound, so that the self-leveling ground mortar has good rheological property, and the phenomena of coagulation and flow resistance cannot occur due to the cooperation of the anti-settling agent and the leveling agent, the fibers have a high-strength reinforcing effect on the self-leveling ground mortar, the mortar has extremely high strength after forming the ground, and the self-leveling ground has the characteristic of higher shrinkage cracking resistance.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The formula of the high-self-leveling acrylic emulsion mainly comprises the following raw material components in parts by weight: 50-70 parts of deionized water, 3-5 parts of an emulsifier, 40-50 parts of butyl acrylate, 8-12 parts of isooctyl acrylate, 35-39 parts of methyl methacrylate, 1-3 parts of hydroxyethyl acrylate, 0.5-1.5 parts of a fluorocarbon monomer, 2-4 parts of acrylic acid, 1-3 parts of acrylamide, 0.25-0.75 part of an initiator, 0.25-0.75 part of a buffering agent, 20-30 parts of a polyacrylate emulsion, 2-4 parts of a water reducing agent, 4-6 parts of a defoaming agent, 1-3 parts of an anti-settling agent, 5-7 parts of a filler, 0.5-1.5 parts of an anti-corrosion bactericide, 1-2 parts of a leveling agent, 6-8 parts of a hydrophobic modified dispersing agent, 2-6 parts of a pH stabilizer and 3-5 parts of a thickening agent.

Preferably, the fluorocarbon monomer is a double-bond fluorocarbon monomer, and the fluorocarbon monomer is tridecafluorooctyl methacrylate or tridecafluorooctyl acrylate.

Preferably, the emulsifier is sodium dodecyl diphenyl oxide disulfonate and fatty alcohol-polyoxyethylene ether.

Preferably, the initiator is ammonium persulfate and the buffer is sodium bicarbonate.

Preferably, the defoaming agent is an organic silicon defoaming agent, the anticorrosion bactericide is a Kathon preservative, and the leveling agent is a fluorine-containing wetting leveling agent.

Preferably, the filler comprises one or more of glass fibers, carbon fibers and polypropylene fibers.

Preferably, the water reducing agent is one or a mixture of a sulfamate water reducing agent, an aliphatic water reducing agent, a polycarboxylic acid water reducing agent and a naphthalene water reducing agent.

Preferably, the hydrophobic modified dispersing agent is a hydrophobic modified carboxylic acid copolymer type sodium salt dispersing agent, the pH stabilizing agent is AMP-95, and the thickening agent is a hydrophobic modified polyurethane thickening agent.

Preferably, the anti-settling agent is hydroxyethyl methyl cellulose or fumed silica.

A preparation method of a high self-leveling acrylic emulsion formula specifically comprises the following steps:

the method comprises the following steps: preparation of the self-leveling additive: stirring and mixing the polyacrylate emulsion, the water reducing agent, the defoaming agent and the anti-settling agent for 0.5-1 h at the rotating speed of 800-1000 r/min; adding a filler into the mixed solution obtained in the first step, and mixing and stirring for 0.25-0.5 h to obtain a self-leveling additive;

step two: preparing a regulator: adding deionized water into a material preparation pot or a material preparation cylinder according to the formula amount, and placing the mixture under a high-speed dispersion machine; starting a high-speed dispersion machine, shifting to 300-500 r/min, stirring, uniformly adding the defoaming agent, the anti-corrosion bactericide, the leveling agent, the hydrophobic modified dispersing agent, the pH value stabilizer and the anti-settling slurry according to the formula amount, and stirring for 20-40 min to prepare a regulator;

step three: placing the self-leveling additive prepared in the step one and the regulator prepared in the step two in a thermocouple reaction kettle, keeping the temperature at 50-60 ℃, and continuously stirring for 1-2 hours to prepare a mixed additive;

step four: preparing a pre-emulsion: stirring and dissolving deionized water, sodium dodecyl diphenyl ether disulfonate and fatty alcohol-polyoxyethylene ether in a pre-emulsification kettle, then adding acrylamide, hydroxyethyl acrylate, acrylic acid, methyl methacrylate, butyl acrylate, isooctyl acrylate and tridecafluorooctyl methacrylate under stirring, and continuing stirring for 10-30 minutes to obtain a pre-emulsion;

step five: preparing an initiator solution: stirring and dissolving deionized water, ammonium persulfate and sodium bicarbonate to obtain initiator liquid;

step six: polymerization: adding deionized water, initiator liquid and pre-emulsion into a reaction kettle, heating to the reaction temperature of 80 +/-2 ℃, reacting for 20-40 minutes, then uniformly dropwise adding the rest of pre-emulsion and the rest of initiator liquid at the same time, completing dropwise adding the pre-emulsion within 2-4 hours, completing dropwise adding the initiator liquid within 3-4 hours, and preserving heat for 0.5-1.5 hours after completing dropwise adding; after the heat preservation is finished, the grafting monomer composition is dripped at the temperature, the grafting monomer composition is polymerized to obtain the required initiator liquid, dripping is finished for half an hour, after dripping is finished, heat preservation is carried out for 1-2 hours at the temperature, then the temperature is reduced to 40-60 ℃, and filtering and discharging are carried out, so that the acrylic emulsion is obtained;

step seven: and (4) adding the mixed additive prepared in the step six into the acrylic emulsion prepared in the step six, and uniformly mixing to obtain the finished product of the acrylic emulsion.

Keeping the first step, the second step, the third step and the seventh step unchanged, preparing the high self-leveling acrylic emulsion according to the following examples:

example one

Preparing a pre-emulsion: stirring and dissolving 30 g of deionized water, 2 g of sodium dodecyl diphenyl ether disulfonate and 2 g of fatty alcohol-polyoxyethylene ether in a pre-emulsification kettle, then adding 2 g of acrylamide, 2 g of hydroxyethyl acrylate, 3 g of acrylic acid, 37 g of methyl methacrylate, 45 g of butyl acrylate, 10 g of isooctyl acrylate and 1 g of tridecafluorooctyl methacrylate under stirring, and continuing stirring for 20 minutes to obtain the pre-emulsion.

Preparing an initiator solution: stirring and dissolving 30 g of deionized water, 0.5 g of ammonium persulfate and 0.5 g of sodium bicarbonate to obtain the initiator liquid.

Polymerization: adding 45 g of deionized water, 9.3 g of initiator liquid and 13.4 g of pre-emulsion into a reaction kettle, heating to the reaction temperature of 80 +/-2 ℃, reacting for 30 minutes, then uniformly dropwise adding the rest of pre-emulsion and the rest of initiator liquid at the same time, completing dripping of the pre-emulsion within 3 hours, completing dripping of the initiator liquid within 3.5 hours, and preserving heat for 1 hour after finishing dripping. After the heat preservation is finished, the grafting monomer composition is dripped at the temperature, the required initiator liquid is polymerized by the grafting monomer composition, dripping is finished for half an hour, after dripping is finished, heat preservation is carried out for 1.5 hours at the temperature, then the temperature is reduced to 50 ℃, and the acrylic emulsion is obtained after filtering and discharging.

Example two

Preparing a pre-emulsion: stirring and dissolving 30 g of deionized water, 2 g of sodium dodecyl diphenyl ether disulfonate and 2 g of fatty alcohol-polyoxyethylene ether in a pre-emulsification kettle, then adding 2 g of acrylamide, 2 g of hydroxyethyl acrylate, 3 g of acrylic acid, 36.5 g of methyl methacrylate, 45 g of butyl acrylate, 10 g of isooctyl acrylate and 1.5 g of tridecafluorooctyl methacrylate under stirring, and continuing stirring for 20 minutes to obtain the pre-emulsion.

Preparing an initiator solution: stirring and dissolving 30 g of deionized water, 0.5 g of ammonium persulfate and 0.5 g of sodium bicarbonate to obtain the initiator liquid.

Polymerization: adding 45 g of deionized water, 9.3 g of initiator liquid and 13.4 g of pre-emulsion into a reaction kettle, heating to the reaction temperature of 80 +/-2 ℃, reacting for 30 minutes, then uniformly dropwise adding the rest of pre-emulsion and the rest of initiator liquid at the same time, completing dripping of the pre-emulsion within 3 hours, completing dripping of the initiator liquid within 3.5 hours, and preserving heat for 1 hour after finishing dripping. After the heat preservation is finished, the grafting monomer composition is dripped at the temperature, the required initiator liquid is polymerized by the grafting monomer composition, dripping is finished for half an hour, after dripping is finished, heat preservation is carried out for 1.5 hours at the temperature, then the temperature is reduced to 50 ℃, and the acrylic emulsion is obtained after filtering and discharging.

EXAMPLE III

Preparing a pre-emulsion: stirring and dissolving 30 g of deionized water, 2 g of sodium dodecyl diphenyl ether disulfonate and 2 g of fatty alcohol-polyoxyethylene ether in a pre-emulsification kettle, then adding 2 g of acrylamide, 2 g of hydroxyethyl acrylate, 3 g of acrylic acid, 37.5 g of methyl methacrylate, 45 g of butyl acrylate, 10 g of isooctyl acrylate and 0.5 g of tridecafluorooctyl methacrylate under stirring, and continuing stirring for 20 minutes to obtain the pre-emulsion.

Preparing an initiator solution: stirring and dissolving 30 g of deionized water, 0.5 g of ammonium persulfate and 0.5 g of sodium bicarbonate to obtain the initiator liquid.

Polymerization: adding 45 g of deionized water, 9.3 g of initiator liquid and 13.4 g of pre-emulsion into a reaction kettle, heating to the reaction temperature of 80 +/-2 ℃, reacting for 30 minutes, then uniformly dropwise adding the rest of pre-emulsion and the rest of initiator liquid at the same time, completing dripping of the pre-emulsion within 3 hours, completing dripping of the initiator liquid within 3.5 hours, and preserving heat for 1 hour after finishing dripping. After the heat preservation is finished, the grafting monomer composition is dripped at the temperature, the required initiator liquid is polymerized by the grafting monomer composition, dripping is finished for half an hour, after dripping is finished, heat preservation is carried out for 1.5 hours at the temperature, then the temperature is reduced to 50 ℃, and the acrylic emulsion is obtained after filtering and discharging.

Example four

Preparing a pre-emulsion: stirring and dissolving 30 g of deionized water, 2 g of sodium dodecyl diphenyl ether disulfonate and 2 g of fatty alcohol-polyoxyethylene ether in a pre-emulsifying kettle, then adding 2 g of acrylamide, 2 g of hydroxyethyl acrylate, 3 g of acrylic acid, 37 g of methyl methacrylate, 45 g of butyl acrylate, 10 g of isooctyl acrylate and 1 g of tridecafluorooctyl acrylate under stirring, and continuing stirring for 20 minutes to obtain the pre-emulsion.

Preparing an initiator solution: stirring and dissolving 30 g of deionized water, 0.5 g of ammonium persulfate and 0.5 g of sodium bicarbonate to obtain the initiator liquid.

Polymerization: adding 45 g of deionized water, 9.3 g of initiator liquid and 13.4 g of pre-emulsion into a reaction kettle, heating to the reaction temperature of 80 +/-2 ℃, reacting for 30 minutes, then uniformly dropwise adding the rest of pre-emulsion and the rest of initiator liquid at the same time, completing dripping of the pre-emulsion within 3 hours, completing dripping of the initiator liquid within 3.5 hours, and preserving heat for 1 hour after finishing dripping. After the heat preservation is finished, the grafting monomer composition is dripped at the temperature, the required initiator liquid is polymerized by the grafting monomer composition, dripping is finished for half an hour, after dripping is finished, heat preservation is carried out for 1.5 hours at the temperature, then the temperature is reduced to 50 ℃, and the acrylic emulsion is obtained after filtering and discharging.

EXAMPLE five

Preparing a pre-emulsion: stirring and dissolving 30 g of deionized water, 2 g of sodium dodecyl diphenyl ether disulfonate and 2 g of fatty alcohol-polyoxyethylene ether in a pre-emulsification kettle, then adding 2 g of acrylamide, 2 g of hydroxyethyl acrylate, 3 g of acrylic acid, 36.5 g of methyl methacrylate, 45 g of butyl acrylate, 10 g of isooctyl acrylate and 1.5 g of tridecafluorooctyl acrylate under stirring, and continuing stirring for 20 minutes to obtain the pre-emulsion.

Preparing an initiator solution: stirring and dissolving 30 g of deionized water, 0.5 g of ammonium persulfate and 0.5 g of sodium bicarbonate to obtain the initiator liquid.

Polymerization: adding 45 g of deionized water, 9.3 g of initiator liquid and 13.4 g of pre-emulsion into a reaction kettle, heating to the reaction temperature of 80 +/-2 ℃, reacting for 30 minutes, then uniformly dropwise adding the rest of pre-emulsion and the rest of initiator liquid at the same time, completing dripping of the pre-emulsion within 3 hours, completing dripping of the initiator liquid within 3.5 hours, and preserving heat for 1 hour after finishing dripping. After the heat preservation is finished, the grafting monomer composition is dripped at the temperature, the required initiator liquid is polymerized by the grafting monomer composition, dripping is finished for half an hour, after dripping is finished, heat preservation is carried out for 1.5 hours at the temperature, then the temperature is reduced to 50 ℃, and the acrylic emulsion is obtained after filtering and discharging.

Comparative example

Preparing a pre-emulsion: stirring and dissolving 30 g of deionized water, 2 g of sodium dodecyl diphenyl ether disulfonate and 2 g of fatty alcohol-polyoxyethylene ether in a pre-emulsification kettle, then adding 2 g of acrylamide, 2 g of hydroxyethyl acrylate, 3 g of acrylic acid, 38 g of methyl methacrylate, 45 g of butyl acrylate and 10 g of isooctyl acrylate under stirring, and continuing stirring for 20 minutes to obtain the pre-emulsion.

Preparing an initiator solution: stirring and dissolving 30 g of deionized water, 0.5 g of ammonium persulfate and 0.5 g of sodium bicarbonate to obtain the initiator liquid.

Polymerization: adding 45 g of deionized water, 9.3 g of initiator liquid and 13.4 g of pre-emulsion into a reaction kettle, heating to the reaction temperature of 80 +/-2 ℃, reacting for 30 minutes, then uniformly dropwise adding the rest of pre-emulsion and the rest of initiator liquid at the same time, completing dripping of the pre-emulsion within 3 hours, completing dripping of the initiator liquid within 3.5 hours, and preserving heat for 1 hour after finishing dripping. After the heat preservation is finished, the grafting monomer composition is dripped at the temperature, the required initiator liquid is polymerized by the grafting monomer composition, dripping is finished for half an hour, after dripping is finished, heat preservation is carried out for 1.5 hours at the temperature, then the temperature is reduced to 50 ℃, and the acrylic emulsion is obtained after filtering and discharging.

Experiment one: respectively carrying out experiments on the surface tension and the initial fluidity of mortar on the acrylic emulsion prepared in the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment and the comparative example and the acrylic emulsion in the prior art, filling the stirred mortar into a conical test mold matched with a cement mortar fluidity tester, scraping the surface, lifting the test mold, starting the fluidity tester (commonly called a jump table), vibrating the mortar after 25 days to form a round cake shape, and measuring 2-3 maximum diameters in different directions by using a caliper or a straight ruler; the experimental data are shown in the following table:

the experimental results are as follows: the emulsion added with the double-bond fluorocarbon monomer copolymerized with the acrylic ester has small surface tension and large initial flow of mortar, which reflects that the emulsion has high self-leveling property and is obviously higher than the self-leveling property of the prior art.

Experiment two: the acrylic emulsions prepared in the above examples I, II, III, IV, V and the comparative examples and the acrylic emulsions in the prior art were respectively tested for their anti-shrinkage cracking performance, which is represented by the compressive strength and the flexural strength, and the experimental data are shown in the following table:

the experimental results are as follows: the acrylic emulsions prepared in the first, second, third, fourth, fifth and comparative examples have comparable resistance to shrinkage cracking and are significantly higher than the resistance to shrinkage cracking of the acrylic emulsions of the prior art.

The technical effects are as follows: according to the formula and the preparation method of the high-self-leveling acrylic emulsion, the fluorocarbon surfactant of the fluorocarbon monomer can obviously reduce the surface tension of a solvent at an extremely low concentration. It has not only hydrophobic properties but also oleophobic properties. Due to the high surface activity performance, the acrylic emulsion has excellent performance in wetting and leveling, and the surfactant of the fluorocarbon monomer with double bonds is copolymerized with butyl acrylate, isooctyl acrylate, methyl methacrylate and hydroxyethyl acrylate, so that the acrylic emulsion cannot migrate, has good product stability and improves the self-leveling property of the acrylic emulsion. According to the formula and the preparation method of the high self-leveling acrylic emulsion, the filler is arranged, the filler comprises fiber glass fibers, carbon fibers and polypropylene fibers with different length-diameter ratios, the fibers with different length-diameter ratios are mutually wound, so that the self-leveling ground mortar has good rheological property, and the phenomena of coagulation and flow resistance cannot occur due to the cooperation of the anti-settling agent and the leveling agent, the fibers have a high-strength reinforcing effect on the self-leveling ground mortar, the mortar has extremely high strength after forming the ground, and the self-leveling ground has the characteristic of higher shrinkage cracking resistance.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The formula of the high self-leveling acrylic emulsion is characterized in that: the raw material components mainly comprise the following components in parts by weight: 50-70 parts of deionized water, 3-5 parts of an emulsifier, 40-50 parts of butyl acrylate, 8-12 parts of isooctyl acrylate, 35-39 parts of methyl methacrylate, 1-3 parts of hydroxyethyl acrylate, 0.5-1.5 parts of a fluorocarbon monomer, 2-4 parts of acrylic acid, 1-3 parts of acrylamide, 0.25-0.75 part of an initiator, 0.25-0.75 part of a buffering agent, 20-30 parts of a polyacrylate emulsion, 2-4 parts of a water reducing agent, 4-6 parts of a defoaming agent, 1-3 parts of an anti-settling agent, 5-7 parts of a filler, 0.5-1.5 parts of an anti-corrosion bactericide, 1-2 parts of a leveling agent, 6-8 parts of a hydrophobic modified dispersing agent, 2-6 parts of a pH stabilizer and 3-5 parts of a thickening agent.

2. The high self-leveling acrylic emulsion formulation of claim 1 wherein: the fluorocarbon monomer is a double-bond fluorocarbon monomer, and is tridecafluorooctyl methacrylate or tridecafluorooctyl acrylate.

3. The high self-leveling acrylic emulsion formulation of claim 1 wherein: the emulsifier is sodium dodecyl diphenyl oxide disulfonate and fatty alcohol-polyoxyethylene ether.

4. The high self-leveling acrylic emulsion formulation of claim 1 wherein: the initiator is ammonium persulfate, and the buffering agent is sodium bicarbonate.

5. The high self-leveling acrylic emulsion formulation of claim 1 wherein: the defoaming agent is an organic silicon defoaming agent, the anticorrosion bactericide is a kasong preservative, and the leveling agent is a fluorine-containing wetting leveling agent.

6. The high self-leveling acrylic emulsion formulation of claim 1 wherein: the filler comprises one or more of glass fibers, carbon fibers, and polypropylene fibers.

7. The high self-leveling acrylic emulsion formulation of claim 1 wherein: the water reducing agent is one or a mixture of a sulfamate water reducing agent, an aliphatic water reducing agent, a polycarboxylic acid water reducing agent and a naphthalene water reducing agent.

8. The high self-leveling acrylic emulsion formulation of claim 1 wherein: the hydrophobic modified dispersant is a hydrophobic modified carboxylic acid copolymer type sodium salt dispersant, the pH stabilizer is AMP-95, and the thickener is a hydrophobic modified polyurethane thickener.

9. The high self-leveling acrylic emulsion formulation of claim 1 wherein: the anti-settling agent adopts hydroxyethyl methyl cellulose or fumed silica.

10. A preparation method of a high self-leveling acrylic emulsion formula is characterized by comprising the following steps: the method specifically comprises the following steps:

the method comprises the following steps: preparation of the self-leveling additive: stirring and mixing the polyacrylate emulsion, the water reducing agent, the defoaming agent and the anti-settling agent for 0.5-1 h at the rotating speed of 800-1000 r/min; adding a filler into the mixed solution obtained in the first step, and mixing and stirring for 0.25-0.5 h to obtain a self-leveling additive;

step two: preparing a regulator: adding deionized water into a material preparation pot or a material preparation cylinder according to the formula amount, and placing the mixture under a high-speed dispersion machine; starting a high-speed dispersion machine, shifting to 300-500 r/min, stirring, uniformly adding the defoaming agent, the anti-corrosion bactericide, the leveling agent, the hydrophobic modified dispersing agent, the pH value stabilizer and the anti-settling slurry according to the formula amount, and stirring for 20-40 min to prepare a regulator;

step three: placing the self-leveling additive prepared in the step one and the regulator prepared in the step two in a thermocouple reaction kettle, keeping the temperature at 50-60 ℃, and continuously stirring for 1-2 hours to prepare a mixed additive;

step four: preparing a pre-emulsion: stirring and dissolving deionized water, sodium dodecyl diphenyl ether disulfonate and fatty alcohol-polyoxyethylene ether in a pre-emulsification kettle, then adding acrylamide, hydroxyethyl acrylate, acrylic acid, methyl methacrylate, butyl acrylate, isooctyl acrylate and tridecafluorooctyl methacrylate under stirring, and continuing stirring for 10-30 minutes to obtain a pre-emulsion;

step five: preparing an initiator solution: stirring and dissolving deionized water, ammonium persulfate and sodium bicarbonate to obtain initiator liquid;

step six: polymerization: adding deionized water, initiator liquid and pre-emulsion into a reaction kettle, heating to the reaction temperature of 80 +/-2 ℃, reacting for 20-40 minutes, then uniformly dropwise adding the rest of pre-emulsion and the rest of initiator liquid at the same time, completing dropwise adding the pre-emulsion within 2-4 hours, completing dropwise adding the initiator liquid within 3-4 hours, and preserving heat for 0.5-1.5 hours after completing dropwise adding; after the heat preservation is finished, the grafting monomer composition is dripped at the temperature, the grafting monomer composition is polymerized to obtain the required initiator liquid, dripping is finished for half an hour, after dripping is finished, heat preservation is carried out for 1-2 hours at the temperature, then the temperature is reduced to 40-60 ℃, and filtering and discharging are carried out, so that the acrylic emulsion is obtained;

step seven: and (4) adding the mixed additive prepared in the step six into the acrylic emulsion prepared in the step six, and uniformly mixing to obtain the finished product of the acrylic emulsion.