CN115505059B - Polyacrylate emulsion and preparation method and application thereof - Google Patents
Polyacrylate emulsion and preparation method and application thereof Download PDFInfo
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- CN115505059B CN115505059B CN202211348698.7A CN202211348698A CN115505059B CN 115505059 B CN115505059 B CN 115505059B CN 202211348698 A CN202211348698 A CN 202211348698A CN 115505059 B CN115505059 B CN 115505059B
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- 239000000839 emulsion Substances 0.000 title claims abstract description 97
- 229920000058 polyacrylate Polymers 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000004945 emulsification Methods 0.000 title description 3
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 238000000137 annealing Methods 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000000843 powder Substances 0.000 claims abstract description 49
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000004321 preservation Methods 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 23
- 239000000178 monomer Substances 0.000 claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000012298 atmosphere Substances 0.000 claims abstract description 10
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 9
- -1 acrylic ester Chemical class 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims description 38
- 239000011248 coating agent Substances 0.000 claims description 37
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 16
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 8
- 239000001307 helium Substances 0.000 claims description 8
- 229910052734 helium Inorganic materials 0.000 claims description 8
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 125000000524 functional group Chemical group 0.000 abstract description 12
- 238000002156 mixing Methods 0.000 abstract description 10
- 230000001276 controlling effect Effects 0.000 abstract description 6
- 230000001804 emulsifying effect Effects 0.000 abstract description 5
- 239000010985 leather Substances 0.000 description 17
- 239000003995 emulsifying agent Substances 0.000 description 12
- 239000004744 fabric Substances 0.000 description 12
- 238000010556 emulsion polymerization method Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 238000006116 polymerization reaction Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- 238000005507 spraying Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 238000000967 suction filtration Methods 0.000 description 7
- 239000006260 foam Substances 0.000 description 6
- 238000005286 illumination Methods 0.000 description 6
- 229920000881 Modified starch Polymers 0.000 description 5
- 239000004368 Modified starch Substances 0.000 description 5
- 238000007385 chemical modification Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 235000019426 modified starch Nutrition 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical group 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000002135 nanosheet Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000399 optical microscopy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Classifications
-
- 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
- C08F120/00—Homopolymers 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
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/10—Esters
- C08F120/12—Esters of monohydric alcohols or phenols
-
- 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
- C08F120/00—Homopolymers 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
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/04—Acids; Metal salts or ammonium salts thereof
- C08F120/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- 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
- C08F120/00—Homopolymers 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
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/10—Esters
- C08F120/12—Esters of monohydric alcohols or phenols
- C08F120/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F120/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
-
- 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
-
- C—CHEMISTRY; METALLURGY
- 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
- C09D133/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- 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
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/08—Homopolymers or copolymers of acrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- 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
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/10—Homopolymers or copolymers of methacrylic acid esters
- C09D133/12—Homopolymers or copolymers of methyl methacrylate
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C11/00—Surface finishing of leather
- C14C11/003—Surface finishing of leather using macromolecular compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses polyacrylate emulsion, a preparation method and application thereof, wherein the preparation method comprises the steps of mixing Ti with 3 C 2 T x The powder is put into nitrogen or inert atmosphere for annealing and heat preservation treatment, and the annealed Ti is obtained 3 C 2 T x A powder; ti after annealing and heat preservation treatment 3 C 2 T x Dispersing the powder in water, adding acrylic ester monomers, and performing ultrasonic treatment to obtain a pre-emulsion; and (3) under the nitrogen atmosphere, dissolving ammonium persulfate in water, adding the water into the pre-emulsion, raising the temperature of the system, stirring for reaction, and regulating the pH value of the system after the reaction is finished to obtain the polyacrylate emulsion. The method leads Ti to be treated by annealing 3 C 2 T x The method is simple to operate, can realize the amphipathic regulation and control by regulating and controlling the content of the self functional groups on the surface of the MXene, can not introduce new functional groups, and avoids the influence of other functional groups on the emulsifying property of the MXene.
Description
Technical Field
The invention belongs to the technical field of polyacrylate emulsifiers, and relates to a polyacrylate emulsion, a preparation method and application thereof.
Background
MXene is a novel two-dimensional transition metal carbide and/or nitride, has large specific surface area, and enriches adjustable surface functional groups so that the MXene can be used as an emulsifier of Pickering emulsion. Meanwhile, the MXene has good photo-thermal conversion performance, so that the MXene emulsifier can effectively enable the emulsion to have photo-thermal conversion performance, and the versatility of the emulsion is effectively expanded. However, the amphiphilic nature of the MXene emulsifier in the emulsion is critical to the impact of emulsion stability. Bian (nanoscales, 2018.10 (8): 3621-3625) discloses a direct method of three-dimensional assembly at the water/oil interface of MXene. It is also indicated that the amphiphilicity of MXene can be regulated by adsorption of cetyl trimethylammonium bromide and that MXene has the potential to stabilize Pickering emulsions. Wei (CN 111748255A) found that the amphiphilicity of MXene can be regulated by modifying MXene with PDA, and that a styrene/water mixed phase is stabilized by MXene, so that a Pickering pre-emulsion with good stability is obtained. Cao (Langmuir, 2021.37 (8): 2649-2657) flocculates MXene by the common inorganic salt NaCl and salt flocculated MXene can be made stable for days by optical microscopy imaging.
The amphipathy of the existing MXene emulsifier is mainly regulated by a chemical modification method, but the modification method has a complex technological process, and the uncertainty factors in the modification process are more, so that the grafting rate is uncontrollable, other functional groups can be grafted on the surface of the MXene, and the emulsification capacity of the MXene can be influenced to a certain extent.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a polyacrylate emulsion, a preparation method and application thereof, thereby effectively solving the technical problems that the grafting rate is uncontrollable and other functional groups are grafted on the surface of the MXene to influence the emulsifying capacity of the MXene in the process of regulating and controlling the amphipathy of the MXene emulsifier by a chemical method in the prior art.
The invention is realized by the following technical scheme:
a method for preparing polyacrylate emulsion, comprising the following steps:
s1: ti is mixed with 3 C 2 T x The powder is put into nitrogen or inert atmosphere for annealing and heat preservation treatment, and the annealed Ti is obtained 3 C 2 T x A powder;
s2: ti after annealing and heat preservation treatment 3 C 2 T x Dispersing the powder in water, adding acrylic ester monomers, and performing ultrasonic treatment to obtain a pre-emulsion;
s3: and (3) under the nitrogen atmosphere, dissolving ammonium persulfate in water, adding the water into the pre-emulsion, raising the temperature of the system, stirring for reaction, and regulating the pH value of the system after the reaction is finished to obtain the polyacrylate emulsion.
Preferably, the inert atmosphere is argon or helium.
Preferably, the annealing temperature is 250-400 ℃, and the heat preservation temperature is 200-250 ℃.
Preferably, the annealed Ti 3 C 2 T x The mass ratio of the powder to the acrylic monomer is 0.0125 (14-18).
Preferably, the acrylic monomer is any one of methyl methacrylate, acrylic acid and butyl acrylate.
Preferably, the mass of the ammonium persulfate accounts for 3-3.3% of the mass of the acrylic monomer.
Preferably, the concentration of the ammonium persulfate is 0.27-0.4 g/mL.
Preferably, in the step S3, ammonium persulfate is dissolved in water and then added to the pre-emulsion by dropwise addition.
A polyacrylate emulsion prepared by the above method.
The polyacrylate emulsion is applied to a photo-thermal coating material.
Compared with the prior art, the invention has the following beneficial technical effects:
preparation method of polyacrylate emulsion, and Ti is obtained by annealing treatment 3 C 2 T x Regulating and controlling the functional groups on the surface to ensure that Ti 3 C 2 T x The hydrophilic groups on the surface are reduced, such as hydroxyl groups, so as to regulate Ti 3 C 2 T x For the purpose of amphipathy, then the annealed Ti is 3 C 2 T x Adding the mixture into a precursor solution for preparing polyacrylate emulsion to prepare the polyacrylate emulsion. The Ti is 3 C 2 T x The amphipathic regulating and controlling method is simple to operate and only regulates and controls Ti 3 C 2 T x The self functional group content of the surface can realize the regulation and control of amphipathy, new functional groups are not introduced, and other functional groups are prevented from causing Ti 3 C 2 T x Influence of the emulsifying properties.
Furthermore, in the annealing process, nitrogen or argon and helium are used for protecting the system, so that Ti is effectively avoided 3 C 2 T x Is a metal oxide semiconductor device.
Further, the annealing temperature is 250-400 ℃, the heat preservation temperature is 200-250 ℃, and Ti is effectively realized 3 C 2 T x And regulating and controlling the content of the surface hydrophilic functional groups.
Furthermore, after ammonium persulfate is dissolved in water, the ammonium persulfate is added into the pre-emulsion in a dropwise adding mode, the adding mode can effectively regulate and control the rate of polymerization reaction, the reaction rate is too fast, and the obtained polymer can be partially gelled to influence the solid content of the polymer, so that the photo-thermal effect of a subsequent coating is influenced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for preparing polyacrylate emulsion in the invention;
FIG. 2 is an unannealed Ti 3 C 2 T x (a) With Ti after annealing at 400℃in example 2 of the present invention 3 C 2 T x (b) Water contact angle comparison results of (2);
FIG. 3 shows the Ti obtained by blending the coating obtained by the polyacrylate emulsion of example 2 with comparative example 1 3 C 2 T x Comparative example 2 photo-thermal conversion performance of coatings made with polyacrylate emulsion alone.
Detailed Description
So that those skilled in the art can appreciate the features and effects of the present invention, a general description and definition of the terms and expressions set forth in the specification and claims follows. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and in the event of a conflict, the present specification shall control.
The theory or mechanism described and disclosed herein, whether right or wrong, is not meant to limit the scope of the invention in any way, i.e., the present disclosure may be practiced without limitation to any particular theory or mechanism.
All features such as values, amounts, and concentrations that are defined herein in the numerical or percent ranges are for brevity and convenience only. Accordingly, the description of a numerical range or percentage range should be considered to cover and specifically disclose all possible sub-ranges and individual values (including integers and fractions) within the range.
Herein, unless otherwise indicated, "comprising," "including," "having," or similar terms encompass the meanings of "consisting of … …" and "consisting essentially of … …," e.g., "a includes a" encompasses the meanings of "a includes a and the other and" a includes a only.
In this context, not all possible combinations of the individual technical features in the individual embodiments or examples are described in order to simplify the description. Accordingly, as long as there is no contradiction between the combinations of these technical features, any combination of the technical features in the respective embodiments or examples is possible, and all possible combinations should be considered as being within the scope of the present specification.
The invention provides a preparation method of polyacrylate emulsion, which is shown in figure 1 and comprises the following steps:
s1: ti is mixed with 3 C 2 T x Placing the powder in a ceramic crucible, and annealing in a tube furnace in nitrogen or inert atmosphere to obtain Ti after annealing and heat preservation treatment 3 C 2 T x A powder; wherein the inert atmosphere is argon or helium, which effectively avoids Ti 3 C 2 T x Oxidation of the powder in a high temperature annealing process. The annealing temperature is 250-400 ℃, the annealing time is 3h, the heat preservation temperature is 200-250 ℃, and the heat preservation time is 2h.
S2: ti after annealing and heat preservation treatment 3 C 2 T x Dispersing the powder in water, adding acrylic ester monomers, and performing ultrasonic treatment to obtain a pre-emulsion; wherein the mass ratio of the MXene powder to water and the acrylic ester monomer after annealing treatment is 0.0125:2 (14-18). The acrylic monomer is any one of methyl methacrylate, acrylic acid and butyl acrylate.
S3: and (3) dissolving ammonium persulfate in water by using a Pickering emulsion polymerization method under the nitrogen atmosphere, then dropwise adding the ammonium persulfate into the pre-emulsion, raising the temperature of the system to 75 ℃, keeping the rotating speed at 300rpm, stirring and reacting for 0.5h, keeping the temperature for 2h after the reaction is finished, and then regulating the pH value of the system to 7 to obtain the polyacrylate emulsion. Wherein ammonium persulfate is used as an initiator, the mass of the ammonium persulfate accounts for 3-3.3% of the mass of the acrylic monomer, and the concentration of the ammonium persulfate is 0.27-0.4 g/mL.
Ti treated by annealing in the above step S1 3 C 2 T x The water contact angle of the alloy is 82.7-88.7 degrees, and the test process is that the annealed Ti is adopted 3 C 2 T x Dispersing the powder in water, and then carrying out suction filtration and drying to obtain Ti 3 C 2 T x Film, test the Ti obtained 3 C 2 T x Water contact angle of the film. The range of the contact angle effectively shows thatTi of (2) 3 C 2 T x The particles have good amphipathic property.
The polyacrylate emulsion obtained by the invention is sprayed on the surface of a substrate, and the photo-thermal coating can be prepared. Wherein, the substrate can be any one of leather, fabric, paper and pipeline. The dosage of the paint sprayed on the surface of the base material is (0.1-0.5) mL/cm 2 . The photo-thermal coating sprayed on the surface of the substrate was sprayed on the surface of the substrate at a solar light intensity (optical power density of 100mW/cm 2 ) After 300 seconds, the surface temperature of the coated substrate may be raised by 60 to 63 ℃. Compared with a pure polyacrylate emulsion coating or a coating obtained by adopting a traditional blending method, the temperature of the substrate is obviously increased, which shows that the polyacrylate emulsion prepared by the invention has good photo-thermal effect.
The invention provides a photo-thermal coating taking MXene as an emulsifier and a preparation method thereof, and the photo-thermal coating is mainly technically characterized in that MXene nano-sheets are used as raw materials, and the MXene is treated by annealing, so that the MXene has certain amphipathy, thereby obtaining the MXene with the potential of a surfactant. The amphiphilic MXene is utilized to emulsify an oil-water mixed phase to obtain a pre-emulsion with good stability, an initiator is added, a Pickering emulsion polymerization method is adopted to prepare a composite emulsion, and the emulsion is sprayed on the surfaces of leather, fabrics, paper, pipelines and the like to construct a photo-thermal coating, so that the functional requirements of the photo-thermal product are met. In addition, the coating obtained by the method is superior to the coating prepared by adopting a blending method of MXene and the traditional emulsion in terms of photo-thermal performance. The invention adopts the physical method of annealing to regulate and control the amphipathy of the MXene, so that the MXene has the potential of a surfactant. At present, the amphipathy of MXene is regulated and controlled by multi-purpose chemical modification in the literature and the patent, but the chemical modification method has complex operation, and more uncontrollable factors in the operation process cause uncontrollable chemical modification results, for example: grafting ratio, etc. The annealing method is simple to operate, nontoxic and safer. Through high-temperature annealing, hydrophilic groups on the surface of the MXene are reduced, so that the purpose of regulating and controlling the amphipathy of the MXene is achieved, the addition of other functional groups on the surface of the MXene due to chemical modification is avoided, the factors influencing the emulsifying capacity of the MXene are reduced, the amphipathy MXene obtained by the method is excellent in emulsifying capacity, and stable pre-emulsion can be obtained. And the prepared photo-thermal coating is superior to the photo-thermal coating prepared by a blending method.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
The following examples use instrumentation conventional in the art. The experimental methods, in which specific conditions are not noted in the following examples, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. The following examples used various starting materials, unless otherwise indicated, were conventional commercial products, the specifications of which are conventional in the art. In the description of the present invention and the following examples, "%" means weight percent, and "parts" means parts by weight, and ratios means weight ratio, unless otherwise specified.
Example 1
A method for preparing polyacrylate emulsion, comprising the following steps:
s1: 1g of Ti is taken 3 C 2 T x Introducing nitrogen into the ceramic crucible by powder, and carrying out annealing and heat preservation operation, namely: annealing for 3h at 250 ℃ and preserving heat for 2h at 200 ℃, cooling the tube furnace to room temperature, and then annealing the Ti 3 C 2 T x Taking out; taking 0.01335 g of Ti annealed at 250 DEG C 3 C 2 T x Dispersing in 2g of water, adding 18g of methyl methacrylate, and performing ultrasonic preparation to obtain a pre-emulsion;
s2: and (3) adding 0.54g of ammonium persulfate into 1.5mL of water under the protection of nitrogen by using a Pickering emulsion polymerization method, dropwise adding the ammonium persulfate into the pre-emulsion, magnetically stirring the mixture in a water bath at 75 ℃ for polymerization reaction at a rotating speed of 300rpm for 0.5h, and after the reaction is completed, preserving heat for 2h, and regulating the pH value of the polymerization emulsion to 7 to prepare the polymerization emulsion.
0.2mL of the resulting polymeric emulsion was sprayed to 1cm 2 The leather surface with the photo-thermal coating is prepared.
Example 2
S1: 1g of Ti is taken 3 C 2 T x Introducing helium into a ceramic crucible from powder, and carrying out annealing operation, namely: annealing for 3h at 400 ℃ and preserving heat for 2h at 250 ℃, cooling the tube furnace to room temperature, and then annealing the Ti 3 C 2 T x Taking out; 0.01335 g of Ti annealed at 400 ℃ is taken 3 C 2 T x Dispersing in 2g of water, adding 18g of methyl methacrylate, and performing ultrasonic preparation to obtain a pre-emulsion;
s2: and (3) under the protection of nitrogen, dissolving 0.54g of ammonium persulfate in 2mL of water by using a Pickering emulsion polymerization method, dropwise adding the solution into the pre-emulsion, magnetically stirring the solution in a water bath at 75 ℃ for polymerization reaction at the speed of 300rpm for 0.5h, and after the reaction is completed, preserving the heat for 2h, and regulating the pH value of the polymerization emulsion to 7 to prepare the polymerization emulsion.
Ti after annealing at 400℃obtained in step S1 of this example 3 C 2 T x Dispersing the powder in water, and then carrying out suction filtration and drying to obtain Ti 3 C 2 T x Films and tested for their water contact angle while testing for Ti without annealing 3 C 2 T x The water contact angle of the film, the test results of which are shown in FIG. 2, and from FIG. 2, it can be seen that Ti was not annealed 3 C 2 T x The water contact angle of the film was 77.8℃and the Ti obtained in this example 3 C 2 T x The film had a water contact angle of 88.7℃and was found to be Ti without annealing treatment 3 C 2 T x The powder is poorly amphiphilic and, after a simple annealing treatment, the Ti is obtained 3 C 2 T x The amphiphilicity of the powder is obviously improved.
0.2mL of the polymerized emulsion prepared in this example was sprayed onto 1cm 2 The leather surface with the photo-thermal coating is prepared, and the photo-thermal property of the coating is tested, and the specific test method is as follows: device for putting on a piece of furnitureThe leather sample with the photo-thermal coating is fixed on a foam board, and the temperature of the surface of the coated leather sample is photographed by an infrared thermal imager under simulated sunlight with illumination intensity and recorded. The test results are shown in FIG. 3. As can be seen from fig. 3, the surface temperature of the emulsion coated leather sample (example 2 sample) prepared by the Pickering emulsion polymerization method is increased by 18 ℃ and 5 ℃ respectively, compared with the surface temperature of the coating without MXene (comparative example 2 sample) and the surface temperature of the coating coated leather sample prepared by the blending method (comparative example 2 sample), and the surface temperature of the substrate is obviously increased, which effectively indicates that the emulsion prepared in the invention has obvious photo-thermal conversion effect.
Comparative example 1
Ti is prepared by adopting a blending method 3 C 2 T x Polyacrylate emulsion and Ti is prepared by spraying 3 C 2 T x Polyacrylate coated leather. Wherein, adopting a blending method to prepare Ti 3 C 2 T x The polyacrylate emulsion is specifically prepared by mixing Ti 3 C 2 T x Dispersing the powder in water, regulating pH value to 7, adding into polyacrylate emulsion, and ultrasonic mixing. Ti used in this comparative example 3 C 2 T x The powder was annealed at 400 ℃. For Ti in the comparative example 3 C 2 T x The photo-thermal properties of the polyacrylate coated leather were tested and the test results are shown in figure 3.
Comparative example 2
The difference from example 2 is that no Ti was added 3 C 2 T x Into methyl methacrylate, namely, a pure polyacrylate emulsion is prepared by methyl methacrylate only, and a polyacrylate coating leather sample is prepared by spraying, and the photo-thermal conversion performance test result of the leather sample is shown in figure 3.
Example 3
S1: 1g of Ti is taken 3 C 2 T x Introducing argon into a tubular furnace in the ceramic crucible for annealing operation, namely: annealing for 3h at 300 ℃ and preserving heat for 2h at 220 ℃, cooling the tube furnace to room temperature, and then annealing the Ti 3 C 2 T x Taking out; 0.01335 g of Ti annealed at 300 ℃ is taken 3 C 2 T x Dispersing in 2g of water, adding 18g of methyl methacrylate, and performing ultrasonic preparation to obtain a pre-emulsion;
s2: and (3) under the protection of nitrogen, dissolving 0.54g of ammonium persulfate in 2mL of water by using a Pickering emulsion polymerization method, dropwise adding the solution into the pre-emulsion, magnetically stirring the solution in a water bath at 75 ℃ for polymerization reaction at the speed of 300rpm for 0.5h, and after the reaction is completed, preserving the heat for 2h, and regulating the pH value of the polymerization emulsion to 7 to prepare the polymerization emulsion.
Example 4
A method for preparing polyacrylate emulsion, comprising the following steps:
s1: ti is mixed with 3 C 2 T x The powder is placed in nitrogen atmosphere and is annealed in a tube furnace to obtain Ti after annealing and heat preservation treatment 3 C 2 T x A powder; wherein the annealing temperature is 250 ℃, the annealing time is 3 hours, the heat preservation temperature is 200 ℃, and the heat preservation time is 2 hours.
S2: ti after annealing and heat preservation treatment 3 C 2 T x Dispersing the powder in water, adding an acrylic acid monomer, and performing ultrasonic treatment to obtain a pre-emulsion; wherein, ti after annealing treatment 3 C 2 T x The mass ratio of powder to water and acrylic monomer was 0.0125:2:14.
S3: and (3) dissolving ammonium persulfate in water under the nitrogen atmosphere by using a Pickering emulsion polymerization method to obtain ammonium persulfate solution with the concentration of 0.27g/mL, then dropwise adding the ammonium persulfate solution into the pre-emulsion, raising the system temperature to 75 ℃, and stirring for reacting for 0.5h at the rotating speed of 300rpm, preserving heat for 2h after the reaction is finished, and then regulating the pH value of the system to 7 to obtain the polyacrylate emulsion. Wherein the mass of the ammonium persulfate accounts for 3 percent of the mass of the acrylic monomer.
Annealing the annealed Ti obtained in step S1 of the present example 3 C 2 T x Dispersing the powder in water, and then carrying out suction filtration and drying to obtain Ti 3 C 2 T x Film and tested for water contact angle, annealed Ti 3 C 2 T x The water contact angle of the film was 82.7 °, and this Ti was used 3 C 2 T x The modified starch has good oleophilic and hydrophilic properties, and can be used as an excellent emulsifier; in addition, the polyacrylate emulsion obtained in the embodiment is sprayed on the surface of the fabric to obtain the fabric with the photo-thermal coating, wherein the spraying amount is 0.1mL/cm 2 . The fabric sample with the photo-thermal coating is fixed on a foam board, the temperature of the surface of the coated fabric is photographed by an infrared thermal imager under simulated sunlight with illumination intensity, and the temperature is recorded, and the test result shows that the temperature of the surface of the fabric reaches 60 ℃, so that the coating has obvious photo-thermal conversion performance.
Example 5
A method for preparing polyacrylate emulsion, comprising the following steps:
s1: ti is mixed with 3 C 2 T x The powder is placed in argon atmosphere and is annealed in a tube furnace to obtain Ti after annealing and heat preservation treatment 3 C 2 T x A powder; wherein the annealing temperature is 270 ℃, the annealing time is 3 hours, the heat preservation temperature is 210 ℃, and the heat preservation time is 2 hours.
S2: ti after annealing and heat preservation treatment 3 C 2 T x Dispersing the powder in water, adding butyl acrylate monomer, and performing ultrasonic treatment to obtain pre-emulsion; wherein, ti after annealing treatment 3 C 2 T x The mass ratio of the powder to water to butyl acrylate was 0.0125:2:14.5.
S3: and (3) dissolving ammonium persulfate in water under the nitrogen atmosphere by using a Pickering emulsion polymerization method to obtain ammonium persulfate melt with the concentration of 0.35g/mL, then dropwise adding the ammonium persulfate melt into the pre-emulsion, raising the system temperature to 75 ℃, increasing the rotating speed to 300rpm, stirring and reacting for 0.5h, preserving heat for 2h after the reaction is finished, and then regulating the pH value of the system to 7 to obtain the polyacrylate emulsion. Wherein the mass of the ammonium persulfate accounts for 3.2 percent of the mass of the acrylic monomer.
Annealing the annealed Ti obtained in step S1 of the present example 3 C 2 T x Dispersing the powder in water, and then carrying out suction filtration and drying to obtain Ti 3 C 2 T x Film and tested for water contact angle, annealed Ti 3 C 2 T x The water contact angle of the film was 84.5 °, and this Ti was used 3 C 2 T x The modified starch has good oleophilic and hydrophilic properties, and can be used as an excellent emulsifier; in addition, the polyacrylate emulsion obtained in the embodiment is sprayed on the surface of the fabric to obtain the fabric with the photo-thermal coating, wherein the spraying amount is 0.15mL/cm 2 . The fabric sample with the photo-thermal coating is fixed on a foam board, the temperature of the surface of the coated fabric is photographed by an infrared thermal imager under simulated sunlight with illumination intensity, and the temperature is recorded, and the test result shows that the temperature of the surface of the fabric reaches 61.5 ℃, and the coating has obvious photo-thermal conversion performance.
Example 6
A method for preparing polyacrylate emulsion, comprising the following steps:
s1: ti is mixed with 3 C 2 T x Placing the powder in helium atmosphere, and annealing in a tube furnace to obtain Ti after annealing and heat preservation treatment 3 C 2 T x A powder; wherein the annealing temperature is 300 ℃, the annealing time is 3 hours, the heat preservation temperature is 230 ℃, and the heat preservation time is 2 hours.
S2: ti after annealing and heat preservation treatment 3 C 2 T x Dispersing the powder in water, adding methyl methacrylate, and performing ultrasonic treatment to obtain a pre-emulsion; wherein, ti after annealing treatment 3 C 2 T x The mass ratio of the powder to water to butyl acrylate was 0.0125:2:15.
S3: and (3) dissolving ammonium persulfate in water under the nitrogen atmosphere by using a Pickering emulsion polymerization method to obtain ammonium persulfate solution with the concentration of 0.37g/mL, then dropwise adding the ammonium persulfate solution into the pre-emulsion, raising the system temperature to 75 ℃, and stirring for reacting for 0.5h at the rotating speed of 300rpm, preserving heat for 2h after the reaction is finished, and then regulating the pH value of the system to 7 to obtain the polyacrylate emulsion. Wherein the mass of the ammonium persulfate accounts for 3.3 percent of the mass of the acrylic monomer.
The step S1 of the embodiment is performedTi after fire treatment 3 C 2 T x Dispersing the powder in water, and then carrying out suction filtration and drying to obtain Ti 3 C 2 T x Film and tested for water contact angle, annealed Ti 3 C 2 T x The water contact angle of the film was 85.9 °, and the Ti was used 3 C 2 T x The modified starch has good oleophilic and hydrophilic properties, and can be used as an excellent emulsifier; in addition, the polyacrylate emulsion obtained in the embodiment can be sprayed on the surface of a pipeline to prepare the pipeline with the photo-thermal coating, wherein the spraying amount is 0.3mL/cm 2 . The pipe sample with the photo-thermal coating is fixed on a foam board, the temperature of the surface of the coated pipe is photographed by an infrared thermal imager under simulated sunlight with illumination intensity, and the temperature is recorded, and the test result shows that the temperature of the surface of the pipe reaches 62.3 ℃, and the coating has obvious photo-thermal conversion performance.
Example 7
A method for preparing polyacrylate emulsion, comprising the following steps:
s1: ti is mixed with 3 C 2 T x Placing the powder in helium atmosphere, and annealing in a tube furnace to obtain Ti after annealing and heat preservation treatment 3 C 2 T x A powder; wherein the annealing temperature is 340 ℃, the annealing time is 3 hours, the heat preservation temperature is 240 ℃, and the heat preservation time is 2 hours.
S2: ti after annealing and heat preservation treatment 3 C 2 T x Dispersing the powder in water, adding methyl methacrylate, and performing ultrasonic treatment to obtain a pre-emulsion; wherein, ti after annealing treatment 3 C 2 T x The mass ratio of the powder to water to butyl acrylate was 0.0125:2:15.7.
S3: and (3) dissolving ammonium persulfate in water under the nitrogen atmosphere by using a Pickering emulsion polymerization method to obtain ammonium persulfate solution with the concentration of 0.4g/mL, then dropwise adding the ammonium persulfate solution into the pre-emulsion, raising the system temperature to 75 ℃, increasing the rotating speed to 300rpm, stirring and reacting for 0.5h, preserving heat for 2h after the reaction is finished, and then regulating the pH value of the system to 7 to obtain the polyacrylate emulsion. Wherein the mass of the ammonium persulfate accounts for 3.3 percent of the mass of the acrylic monomer.
Annealing the annealed Ti obtained in step S1 of the present example 3 C 2 T x Dispersing the powder in water, and then carrying out suction filtration and drying to obtain Ti 3 C 2 T x Film and tested for water contact angle, annealed Ti 3 C 2 T x The water contact angle of the film was 86.4 °, and the Ti was used 3 C 2 T x The modified starch has good oleophilic and hydrophilic properties, and can be used as an excellent emulsifier; in addition, the polyacrylate emulsion obtained in the embodiment can be sprayed on the surface of leather to prepare leather with a photo-thermal coating, wherein the spraying amount is 0.38mL/cm 2 . The leather sample with the photo-thermal coating is fixed on a foam board, the temperature of the surface of the coated leather is photographed by an infrared thermal imager under simulated sunlight with illumination intensity, and the temperature is recorded, and the test result shows that the temperature of the surface of the leather reaches 63 ℃, so that the coating has obvious photo-thermal conversion performance.
Example 8
A method for preparing polyacrylate emulsion, comprising the following steps:
s1: ti is mixed with 3 C 2 T x Placing the powder in helium atmosphere, and annealing in a tube furnace to obtain Ti after annealing and heat preservation treatment 3 C 2 T x A powder; wherein the annealing temperature is 400 ℃, the annealing time is 3 hours, the heat preservation temperature is 250 ℃, and the heat preservation time is 2 hours.
S2: ti after annealing and heat preservation treatment 3 C 2 T x Dispersing the powder in water, adding methyl methacrylate, and performing ultrasonic treatment to obtain a pre-emulsion; wherein, ti after annealing treatment 3 C 2 T x The mass ratio of the powder to water to butyl acrylate was 0.0125:2:17.
S3: and (3) dissolving ammonium persulfate in water under the nitrogen atmosphere by using a Pickering emulsion polymerization method to obtain ammonium persulfate solution with the concentration of 0.4g/mL, then dropwise adding the ammonium persulfate solution into the pre-emulsion, raising the system temperature to 75 ℃, increasing the rotating speed to 300rpm, stirring and reacting for 0.5h, preserving heat for 2h after the reaction is finished, and then regulating the pH value of the system to 7 to obtain the polyacrylate emulsion. Wherein the mass of the ammonium persulfate accounts for 3.3 percent of the mass of the acrylic monomer.
Annealing the annealed Ti obtained in step S1 of the present example 3 C 2 T x Dispersing the powder in water, and then carrying out suction filtration and drying to obtain Ti 3 C 2 T x Film and tested for water contact angle, annealed Ti 3 C 2 T x The water contact angle of the film was 88.7 °, and this Ti was used 3 C 2 T x The modified starch has good oleophilic and hydrophilic properties, and can be used as an excellent emulsifier; in addition, the polyacrylate emulsion obtained in the embodiment can be sprayed on the surface of paper to prepare the paper with the photo-thermal coating, wherein the spraying amount is 0.5mL/cm 2 . The paper sample with the photo-thermal coating is fixed on a foam board, the temperature of the surface of the coated paper is photographed by an infrared thermal imager under simulated sunlight with illumination intensity, and the temperature is recorded, and the test result shows that the temperature of the surface of the paper reaches 63 ℃, so that the coating has obvious photo-thermal conversion performance.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (7)
1. The preparation method of the polyacrylate emulsion is characterized by comprising the following steps of:
s1: ti is mixed with 3 C 2 T x The powder is put into nitrogen or inert atmosphere for annealing and heat preservation treatment to obtain the annealing productTi after fire treatment 3 C 2 T x A powder;
the annealing temperature is 250-400 ℃, the annealing time is 3 hours, the heat preservation temperature is 200-250 ℃, and the heat preservation time is 2 hours;
s2: ti after annealing and heat preservation treatment 3 C 2 T x Dispersing the powder in water, adding acrylic ester monomers, and performing ultrasonic treatment to obtain a pre-emulsion;
ti after the annealing treatment 3 C 2 T x The mass ratio of the powder to the acrylic monomer is 0.0125 (14-18);
the acrylic ester monomer is any one of methyl methacrylate, acrylic acid and butyl acrylate;
s3: and (3) under the nitrogen atmosphere, ammonium persulfate is dissolved in water, then the ammonium persulfate is added into the pre-emulsion, the temperature of the system is increased, the stirring reaction is carried out, and after the reaction is finished, the pH value of the system is regulated to 7, so that the polyacrylate emulsion is obtained.
2. The method for preparing a polyacrylate emulsion according to claim 1, wherein the inert atmosphere is argon or helium.
3. The preparation method of the polyacrylate emulsion according to claim 1, wherein the mass of the ammonium persulfate is 3% -3.3% of the mass of the acrylic ester monomer.
4. The method for preparing the polyacrylate emulsion according to claim 1, wherein the concentration of ammonium persulfate is 0.27-0.4 g/mL.
5. The method according to claim 1, wherein in the step S3, ammonium persulfate is dissolved in water and then added to the pre-emulsion by dropwise addition.
6. A polyacrylate emulsion prepared by the method of any one of claims 1 to 5.
7. Use of the polyacrylate emulsion as claimed in claim 6 in photothermal coating materials.
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