CN115477724A - Elastic emulsion for external wall with excellent rain mark resistance and preparation method thereof - Google Patents
Elastic emulsion for external wall with excellent rain mark resistance and preparation method thereof Download PDFInfo
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- CN115477724A CN115477724A CN202211181826.3A CN202211181826A CN115477724A CN 115477724 A CN115477724 A CN 115477724A CN 202211181826 A CN202211181826 A CN 202211181826A CN 115477724 A CN115477724 A CN 115477724A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/30—Emulsion polymerisation with the aid of emulsifying agents non-ionic
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/24—Homopolymers or copolymers of amides or imides
- C09D133/26—Homopolymers or copolymers of acrylamide or methacrylamide
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Abstract
The invention relates to an acrylate emulsion and a preparation method thereof, in particular to an elastic emulsion for an outer wall with excellent rain mark resistance and a preparation method thereof, which are characterized by comprising the following raw materials by weight: 100 parts of water, butyl acrylate: 30-80 parts of isooctyl acrylate, 15-60 parts of styrene, 10-30 parts of acrylonitrile, 4-8 parts of acrylic acid, 0-3 parts of methacrylic acid, 0.4-1 part of acrylamide, 0-2 parts of methacrylamide, 0.2-1 part of diacetone acrylamide, 0.1-0.5 part of adipic acid diacyl trap, 0.1-0.3 part of silane coupling agent, 2-5 parts of emulsifier and 0.1-0.5 part of persulfate; the elastic emulsion has excellent rain mark resistance, and does not influence the storage and application performance of the coating.
Description
Technical Field
The invention relates to an acrylate emulsion and a preparation method thereof, in particular to an elastic emulsion for an outer wall with excellent rain mark resistance and a preparation method thereof.
Background
The elastic building coating for the outer wall has good elasticity, so that cracks of the wall body caused by temperature change can be effectively covered, and the elastic building coating is widely used in the field of buildings. However, the existing elastic coating for the outer wall has an obvious coating defect, and after the coating is dried in a rainy day, obvious rain marks can be left, so that the attractiveness of the wall is seriously affected. Such coating film defects are mainly caused by migration of surfactants such as wetting dispersants, emulsifiers, etc. in the coating film to the surface of the coating film.
In order to improve the rain mark resistance of the elastic coating for the outer wall in the prior art, the method mainly comprises the following two ways: 1. the dosage of wetting dispersant and the like is reduced. However, this method results in poor storage of the coating material, reduced storage time of the coating material, and poor workability. 2. The proper emulsion is selected, but the elastic emulsion in the current market can not reduce the dosage of wetting dispersant and the like in the coating, and can not prevent the wetting dispersant and the emulsifier contained in the emulsion from migrating to the surface of a coating film, so how to develop the elastic emulsion which has excellent rain mark resistance and can not influence the storage and the application of the coating is a difficult problem in the current acrylate emulsion industry.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an elastic emulsion for an outer wall with excellent rain mark resistance.
Another object of the present invention is to provide a method for preparing the above elastic emulsion for exterior walls having excellent rainmark resistance with a simple process.
The invention aims to realize the following steps: an elastic emulsion for an external wall with excellent rain mark resistance is characterized by comprising the following raw materials in parts by weight: 100 parts of water, butyl acrylate: 30-80 parts of isooctyl acrylate, 15-60 parts of styrene, 10-30 parts of acrylonitrile, 4-8 parts of acrylic acid, 0-3 parts of methacrylic acid, 0.4-1 part of acrylamide, 0-2 parts of methacrylamide, 0.2-1 part of diacetone acrylamide, 0.1-0.5 part of adipic acid diacyl trap, 0.1-0.3 part of silane coupling agent, 2-5 parts of emulsifier and 0.1-0.5 part of persulfate.
According to a preferred embodiment of the present invention, the silane coupling agent is at least one of vinyltrimethoxysilane, vinyltriethoxysilane, gamma- (methacryloyloxy) propyltrimethoxysilane.
According to another preferred embodiment of the invention, the emulsifier is compounded by a reactive anionic emulsifier, a phosphate ester emulsifier and a reactive nonionic emulsifier, and the mass ratio of the nonionic emulsifier to the phosphate ester emulsifier to the reactive anionic emulsifier is 1 (0.5-1) to (0.5-2).
According to still another preferred embodiment of the present invention, the reactive anionic emulsifier is at least one of sodium allyloxy hydroxypropyl sulfonate, sodium 2-acrylamido-2-methylpropanesulfonate, alkyl propenyl phenoxy polyether sulfate, and ammonium allyloxy isomeric alcohol ether sulfate.
According to still another preferred embodiment of the present invention, the phosphate ester emulsifier is at least one of allyl polyether phosphate, ammonium allyl polyether phosphate, and linear alkyl alcohol polyoxyethylene ether phosphate monoester.
According to another preferred embodiment of the present invention, the reactive nonionic emulsifier is at least one of allyl alcohol polyoxyethylene ether, isoamylene alcohol polyoxyethylene ether and methallyl alcohol polyoxyethylene ether.
According to another preferred embodiment of the present invention, the initiator is one or a mixture of ammonium persulfate, potassium persulfate and sodium persulfate in any proportion.
According to another aspect of the present invention, the preparation method comprises the steps of:
a. adding 45-55 parts of deionized water and 0.2-1 part of emulsifier into a reaction kettle, uniformly stirring, and heating until the temperature in the kettle reaches 75-90 ℃;
b. adding butyl acrylate, isooctyl acrylate, styrene, acrylonitrile, acrylic acid, methacrylic acid, acrylamide, methacrylamide, diacetone acrylamide, 1.2-4 parts of emulsifier and 35-45 parts of deionized water into a pre-emulsification cylinder at normal temperature, and fully stirring for 30 minutes to prepare uniform pre-emulsion;
c. adding 0.1-0.5 part of initiator and 8-12 parts of deionized water into an initiator cylinder at normal temperature, and stirring until the initiator and the deionized water are completely dissolved for later use;
d. when the temperature in the reaction kettle reaches 75-93 ℃, adding 2-10% of the total amount of the pre-emulsion B and 10-30% of the total amount of the initiator solution C into the kettle, keeping the temperature for 10-30 minutes, then dropwise adding the rest pre-emulsion and the initiator solution into the reaction kettle at a constant speed, adding a silane coupling agent into a pre-emulsion cylinder when dropwise adding is carried out for 2-4 hours, stirring for 30 minutes, and then continuously dropwise adding for 3-6 hours;
e. after the dropwise addition is finished, controlling the temperature in the reaction kettle to be 75-93 ℃, and preserving the heat for 1-2 hours;
f. cooling to 65-75 ℃, adding an oxidation reducing agent into the reaction kettle, and keeping the temperature for 10-30 minutes;
g. cooling to below 50 ℃, adding ammonia water into the reaction kettle to adjust the pH value to 7, then adding adipic acid diacid trap, stirring for 0.5-1 hour, filtering and discharging to obtain the exterior wall elastic emulsion with excellent rain mark resistance
The invention has the following advantages:
1. the anionic emulsifier and the nonionic emulsifier selected by the emulsion are reactive emulsifiers, so that compared with the traditional elastic emulsion, the problem that the emulsifier migrates to the surface of a coating film to form rain marks on the surface of the coating film is avoided. The non-reactive emulsifier used in the traditional elastic emulsion is not hydrophilic, is easy to migrate to the surface of a coating film along with the evaporation of water to form rain marks, and is one of the main sources of the problem of the rain marks of the elastic coating. The reactive emulsifier used in the emulsion contains double bonds capable of carrying out polymerization reaction, and is grafted to the molecular chain of an acrylate polymer in the polymerization reaction, and the combination of the strong chemical bonds ensures that emulsifier molecules with hydrophilic property can not migrate along with the evaporation of water, thereby solving the problem of rain marks from the source.
2. The phosphate ester emulsifier selected by the emulsion has excellent wetting and dispersing properties, can obviously reduce the use of hydrophilic substances such as wetting and dispersing agents and the like in the coating, contains double bonds capable of carrying out polymerization reaction, and is grafted to the molecular chain of an acrylate polymer in the polymerization reaction, so that the migration along with the evaporation of water is avoided, the wetting and dispersing effects are realized, and the problem of rain marks generated on the surface of a coating film due to the migration of the emulsifier is avoided.
3. The room-temperature self-crosslinking monomer selected by the emulsion disclosed by the invention is subjected to crosslinking reaction in the coating drying process, and a dense net structure is formed in the coating and on the surface of the coating, so that the net structure can effectively prevent hydrophilic substances such as a wetting dispersant and the like from migrating to the surface of the coating, and the problem of rain marks generated on the surface of the coating due to the migration of an emulsifier is avoided.
4. The emulsion is heated by hot water or water vapor at 70-95 ℃ in the preparation process, the heating medium is hot water or water vapor, the source is convenient, the emulsion can be recycled and is pollution-free, the whole reaction system can be carried out in a relatively mild environment, and the stability and the reproducibility of the reaction are ensured. Meanwhile, the whole reaction is carried out in the reaction kettle, and the preparation can be carried out only by heating and stirring, so that the processing procedure is simple, and the processing cost is low.
Detailed Description
The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes or modifications in the components and amounts of the materials used in these embodiments can be made without departing from the spirit and scope of the invention.
Example 1
An elastic emulsion for an external wall with excellent rain mark resistance comprises the following raw materials in parts by weight: 100 parts of water, butyl acrylate: 65 parts, 25 parts of isooctyl acrylate, 27 parts of styrene, 6 parts of acrylonitrile, 0.2 part of acrylic acid, 1.2 parts of methacrylic acid, 0.5 part of acrylamide, 0.6 part of methacrylamide, 0.2 part of diacetone acrylamide, 0.1 part of adipic acid diacyl trap, 0.1 part of silane coupling agent, 2 parts of emulsifier and 0.2 part of persulfate.
The silane coupling agent is vinyl trimethoxy silane
The emulsifier is compounded by a reactive anionic emulsifier, a phosphate ester emulsifier and a reactive nonionic emulsifier, wherein the mass ratio of the nonionic emulsifier to the phosphate ester emulsifier to the reactive anionic emulsifier is 1.
The reactive anionic emulsifier is allyloxy hydroxypropyl sodium sulfonate and alkyl propenyl phenoxy polyether sulfate.
The phosphate ester emulsifier is allyl polyether phosphate ester.
The reactive nonionic emulsifier is allyl alcohol polyoxyethylene ether.
The initiator is ammonium persulfate.
The preparation method comprises the following steps:
a. adding 50 parts of deionized water and 0.3 part of emulsifier into a reaction kettle, uniformly stirring, and heating until the temperature in the kettle reaches 84 ℃;
b. adding butyl acrylate, isooctyl acrylate, styrene, acrylonitrile, acrylic acid, methacrylic acid, acrylamide, methacrylamide, diacetone acrylamide, 1.7 parts of emulsifier and 40 parts of deionized water into a pre-emulsification cylinder at normal temperature, and fully stirring for 30 minutes to prepare uniform pre-emulsion;
c. adding 0.1-0.5 part of initiator and 10 parts of deionized water into an initiator cylinder at normal temperature, and stirring until the initiator and the deionized water are completely dissolved for later use;
d. when the temperature in the reaction kettle reaches 84 ℃, adding 5 percent of the total amount of the pre-emulsion B and 40 percent of the total amount of the initiator solution C into the kettle, keeping the temperature for 20 minutes, dropwise adding the rest pre-emulsion and the initiator solution into the reaction kettle at a constant speed, adding a silane coupling agent into a pre-emulsion cylinder when dropwise adding is carried out for 2 hours, stirring for 30 minutes, and then continuously dropwise adding for 1 hour;
e. after the dropwise addition is finished, controlling the temperature in the reaction kettle to be 87-89 ℃, and preserving the heat for 1.5 hours;
f. cooling to 65-75 ℃, adding an oxidation reducing agent into the reaction kettle, and keeping the temperature for 20 minutes;
g. cooling to below 50 ℃, adding ammonia water into the reaction kettle to adjust the pH value to 7, then adding an adipic acid diacid trap, stirring for 0.5 hour, filtering and discharging to obtain the outer wall elastic emulsion with excellent rain mark resistance.
The colored emulsion paint prepared from the emulsion is cured for 12 hours at normal temperature after a film is formed on a plate, water is dripped on a sample plate, and no water mark appears on the film after water is naturally evaporated.
Example 2
An elastic emulsion for an external wall with excellent rain mark resistance comprises the following raw materials in parts by weight: 100 parts of water, butyl acrylate: 72 parts of isooctyl acrylate, 19 parts of styrene, 26 parts of acrylonitrile, 0.5 part of acrylic acid, 1 part of methacrylic acid, 0.2 part of acrylamide, 0.6 part of methacrylamide, 0.2 part of diacetone acrylamide, 0.1 part of adipic acid diacyl trap, 0.1 part of silane coupling agent, 3 parts of emulsifier and 0.2 part of persulfate.
The silane coupling agent is vinyl trimethoxy silane
The emulsifier is compounded by a reactive anionic emulsifier, a phosphate ester emulsifier and a reactive nonionic emulsifier, wherein the mass ratio of the nonionic emulsifier to the phosphate ester emulsifier to the reactive anionic emulsifier is 1.
The reactive anionic emulsifier is allyloxy hydroxypropyl sodium sulfonate and allyloxy isomeric alcohol ether sulfate ammonium salt, and the weight ratio of the two emulsifiers is 1:1.
The phosphate ester emulsifier is allyl polyether phosphate ester.
The reactive nonionic emulsifier is isoamylol polyoxyethylene ether and methyl allyl alcohol polyoxyethylene ether, and the weight ratio of the two emulsifiers is 1:1.
The initiator is ammonium persulfate.
The preparation method comprises the following steps:
a. adding 50 parts of deionized water and 0.7 part of emulsifier into a reaction kettle, uniformly stirring, and heating until the temperature in the kettle reaches 84 ℃;
b. adding butyl acrylate, isooctyl acrylate, styrene, acrylonitrile, acrylic acid, methacrylic acid, acrylamide, methacrylamide, diacetone acrylamide, 2.3 parts of emulsifier and 40 parts of deionized water into a pre-emulsification cylinder at normal temperature, and fully stirring for 30 minutes to prepare uniform pre-emulsion;
c. adding 0.2 part of initiator and 10 parts of deionized water into an initiator cylinder at normal temperature, and stirring until the initiator and the deionized water are completely dissolved for later use;
d. when the temperature in the reaction kettle reaches 84 ℃, adding 4 percent of the total amount of the pre-emulsion B and 45 percent of the total amount of the initiator solution C into the kettle, keeping the temperature for 20 minutes, dropwise adding the rest pre-emulsion and the initiator solution into the reaction kettle at a constant speed, adding a silane coupling agent into the pre-emulsion cylinder when dropwise adding is carried out for 2.5 hours, stirring for 30 minutes, and then continuously dropwise adding for 1 hour;
e. after the dropwise addition is finished, controlling the temperature in the reaction kettle to be 87-89 ℃, and preserving the heat for 1.5 hours;
f. cooling to 65-75 ℃, adding an oxidation reducing agent into the reaction kettle, and keeping the temperature for 20 minutes;
g. cooling to below 50 ℃, adding ammonia water into the reaction kettle to adjust the pH value to 7, then adding an adipic acid diacid trap, stirring for 0.5-1 hour, filtering and discharging to obtain the outer wall elastic emulsion with excellent rain mark resistance.
The colored emulsion paint prepared from the emulsion is cured for 12 hours at normal temperature after the film is formed on a plate, water is dripped on a sample plate, and no water mark appears on the film after the water is naturally evaporated.
Example 3
An elastic emulsion for an external wall with excellent rain mark resistance comprises the following raw materials in parts by weight: 100 parts of water, butyl acrylate: 50 parts, 38 parts of isooctyl acrylate, 29 parts of styrene, 7 parts of acrylonitrile, 0.2 part of acrylic acid, 1.5 parts of methacrylic acid, 0.2 part of acrylamide, 1 part of methacrylamide, 0.3 part of diacetone acrylamide, 0.15 part of adipic acid diacyl trap, 0.1 part of silane coupling agent, 3 parts of emulsifier and 0.2 part of persulfate.
The silane coupling agent is vinyl triethoxysilane.
The emulsifier is compounded by a reactive anionic emulsifier, a phosphate ester emulsifier and a reactive nonionic emulsifier, wherein the mass ratio of the nonionic emulsifier to the phosphate ester emulsifier to the reactive anionic emulsifier is 1.5.
The reactive anionic emulsifier is 2-acrylamide-2-methyl sodium propanesulfonate and alkyl propenyl phenoxy polyether sulfate, and the weight ratio of the two emulsifiers is 1:2.
The phosphate ester emulsifier is allyl polyether phosphate ammonium salt.
The reactive nonionic emulsifier is methyl allyl alcohol polyoxyethylene ether.
The initiator is ammonium persulfate.
The preparation method comprises the following steps:
a. adding 50 parts of deionized water and 0.5 part of emulsifier into a reaction kettle, uniformly stirring, and heating until the temperature in the kettle reaches 86 ℃;
b. adding butyl acrylate, isooctyl acrylate, styrene, acrylonitrile, acrylic acid, methacrylic acid, acrylamide, methacrylamide, diacetone acrylamide, 2.5 parts of emulsifier and 40 parts of deionized water into a pre-emulsification cylinder at normal temperature, and fully stirring for 30 minutes to prepare uniform pre-emulsion;
c. adding 0.2 part of initiator and 10 parts of deionized water into an initiator cylinder at normal temperature, and stirring until the initiator and the deionized water are completely dissolved for later use;
d. when the temperature in the reaction kettle reaches 86 ℃, adding 3 percent of the total amount of the pre-emulsion B and 30 percent of the total amount of the initiator solution C into the kettle, keeping the temperature for 20 minutes, dropwise adding the rest pre-emulsion and the initiator solution into the reaction kettle at a constant speed, adding a silane coupling agent into a pre-emulsion cylinder when dropwise adding is carried out for 2 hours, stirring for 30 minutes, and then continuously dropwise adding for 1.5 hours;
e. after the dropwise addition is finished, controlling the temperature in the reaction kettle to be 89-92 ℃, and preserving the heat for 1 hour;
f. cooling to 65-75 ℃, adding an oxidation reducing agent into the reaction kettle, and keeping the temperature for 20 minutes;
g. cooling to below 50 ℃, adding ammonia water into the reaction kettle to adjust the pH value to 7, then adding an adipic acid diacid trap, stirring for 0.5-1 hour, filtering and discharging to obtain the outer wall elastic emulsion with excellent rain mark resistance.
The colored emulsion paint prepared from the emulsion is cured for 12 hours at normal temperature after a film is formed on a plate, water is dripped on a sample plate, and no water mark appears on the film after water is naturally evaporated.
Although exemplary embodiments and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while maintaining the scope of the present invention.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (8)
1. An elastic emulsion for external walls with excellent rain mark resistance is characterized by comprising the following raw materials by weight: 100 parts of water, butyl acrylate: 30-80 parts of isooctyl acrylate, 15-60 parts of styrene, 10-30 parts of acrylonitrile, 4-8 parts of acrylic acid, 0-3 parts of methacrylic acid, 0.4-1 part of acrylamide, 0-2 parts of methacrylamide, 0.2-1 part of diacetone acrylamide, 0.1-0.5 part of adipic acid diacyl trap, 0.1-0.3 part of silane coupling agent, 2-5 parts of emulsifier and 0.1-0.5 part of persulfate.
2. The elastic emulsion for external walls having excellent raindrop-mark resistance according to claim 1, characterized in that: the silane coupling agent is at least one of vinyl trimethoxy silane, vinyl triethoxy silane and gamma- (methacryloyloxy) propyl trimethoxy silane.
3. The elastic emulsion for external walls having excellent raindrop-mark resistance according to claim 1, characterized in that: the emulsifier is compounded by a reactive anionic emulsifier, a phosphate ester emulsifier and a reactive nonionic emulsifier, wherein the mass ratio of the nonionic emulsifier to the phosphate ester emulsifier to the reactive anionic emulsifier is 1 (0.5-1) to 0.5-2.
4. The elastic emulsion for external walls having excellent raindrop-mark resistance according to claim 2, characterized in that: the reactive anionic emulsifier is at least one of allyloxy hydroxypropyl sodium sulfonate, 2-acrylamide-2-methyl propyl sodium sulfonate, alkyl propenyl phenoxy polyether sulfate and allyloxy isomeric alcohol ether sulfate ammonium salt.
5. The elastic emulsion for external walls having excellent raindrop-mark resistance according to claim 2, characterized in that: the phosphate ester emulsifier is at least one of allyl polyether phosphate, allyl polyether phosphate ammonium salt and linear alkyl alcohol polyoxyethylene ether phosphate monoester.
6. The elastic emulsion for external walls having excellent raindrop-resistant property according to claim 2, characterized in that: the reactive nonionic emulsifier is at least one of allyl alcohol polyoxyethylene ether, isoamylol polyoxyethylene ether and methyl allyl alcohol polyoxyethylene ether.
7. The elastic emulsion for external walls having excellent raindrop-mark resistance according to claim 1, characterized in that: the initiator is at least one of ammonium persulfate, potassium persulfate and sodium persulfate.
8. A method for preparing the elastic emulsion for external walls having excellent raindrop-resistant property according to claim 1, characterized in that: the method comprises the following steps:
a. adding 45-55 parts of deionized water and 0.2-1 part of emulsifier into a reaction kettle, uniformly stirring, and heating until the temperature in the kettle reaches 75-90 ℃;
b. adding butyl acrylate, isooctyl acrylate, styrene, acrylonitrile, acrylic acid, methacrylic acid, acrylamide, methacrylamide, diacetone acrylamide, 1.2-4 parts of emulsifier and 35-45 parts of deionized water into a pre-emulsification cylinder at normal temperature, and fully stirring for 30 minutes to prepare uniform pre-emulsion;
c. adding 0.1-0.5 part of initiator and 8-12 parts of deionized water into an initiator cylinder at normal temperature, and stirring until the initiator and the deionized water are completely dissolved for later use;
d. when the temperature in the reaction kettle reaches 75-93 ℃, adding 2-10% of the total amount of the pre-emulsion B and 10-30% of the total amount of the initiator solution C into the kettle, keeping the temperature for 10-30 minutes, dropwise adding the rest pre-emulsion and the initiator solution into the reaction kettle at a constant speed, adding a silane coupling agent into a pre-emulsification cylinder when dropwise adding for 2-4 hours, stirring for 30 minutes, and then continuously dropwise adding for 3-6 hours;
e. after the dropwise addition is finished, controlling the temperature in the reaction kettle to be 75-93 ℃, and preserving the heat for 1-2 hours;
f. cooling to 65-75 ℃, adding an oxidation reducing agent into the reaction kettle, and keeping the temperature for 10-30 minutes;
g. cooling to below 50 ℃, adding ammonia water into the reaction kettle to adjust the pH value to 7, then adding an adipic acid diacid trap, stirring for 0.5-1 hour, filtering and discharging to obtain the outer wall elastic emulsion with excellent rain mark resistance.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115960301A (en) * | 2023-01-08 | 2023-04-14 | 广东巴德富新材料有限公司 | Zero-raindrop elastic acrylic emulsion with excellent mechanical retention rate and preparation method thereof |
| CN117777382A (en) * | 2023-12-26 | 2024-03-29 | 珠海金鸡化工有限公司 | High-barrier styrene-acrylic latex and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117777382A (en) * | 2023-12-26 | 2024-03-29 | 珠海金鸡化工有限公司 | High-barrier styrene-acrylic latex and preparation method thereof |
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