CN104211879B - Method for preparing high-solid-content graphene oxide grafted polyacrylate composite emulsion by using in-situ method - Google Patents
Method for preparing high-solid-content graphene oxide grafted polyacrylate composite emulsion by using in-situ method Download PDFInfo
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Abstract
The invention relates to a method for preparing a high-solid-content graphene oxide grafted polyacrylate composite emulsion by using an in-situ method. The method comprises the following steps: carrying out ultrasonic treatment on mixed graphene oxide, sulfoxide chloride and N,N-dimethyl formamide; refluxing, raising temperature, carrying out heat preservation and cooling; adding N,N-dimethyl formamide to perform rotary evaporation; adding triethylamine and hydroxyethyl acrylate, and dissolving black powder which is obtained by suction filtration and washing into distilled water; adding sodium lauryl sulfate to carry out ultrasonic treatment, thereby obtaining double-bonded graphene oxide; mixing the double-bonded graphene oxide with sodium lauryl sulfate and distilled water to perform ultrasonic treatment; raising temperature and adding ammonium persulfate and distilled water; and dropwise adding acrylic acid, methyl methacrylate, butyl acrylate and an initiator solution, carrying out heat preservation and discharging. By introducing the double-bonded graphene oxide into the preparation process of the polyacrylate emulsion, the obtained composite emulsion is high in solid content, high in film breaking strength, basically invariable in elongation at break, and high in water absorption rate.
Description
Technical field
The present invention relates to a kind of preparation method of polyacrylate dispersion is and in particular to a kind of in-situ method prepares high solids content
The method of graphene oxide grafted polyacrylic acid ester composite emulsion.
Background technology
Graphene（Graphene）Be a kind of by carbon atom with sp2Hybrid orbital forms the plane that hexangle type is in honeycomb lattice
Thin film, has good electricity, calorifics and mechanical performance etc., thus is widely used in heat-proof combustion-resistant material in polymeric substrate
The research of the aspects such as material, composite conductive thin film, reinforcing fiber.The method that conventional polymer is combined with Graphene has solution blending
Method, fusion method and in-situ method.Solution blended process is can to dissolve polymer based on one can make the solution system of graphene dispersion again
System, makes polymer and Graphene carry out by the effect of solvent a certain degree of compound.Solvent, stone is not needed in fusion method
Black alkene or modified graphene are directly mixed under molten with polymer, and this method is widely used in thermoplastic polymer
Compound.Both approaches are simple, but the strong intermolecular force due to graphene film interlayer and surface inertness so that
Its dispersibility in organic solvent is not good, and also difficult and other organic substrates carry out the compound of profound level.
In-situ method refers to Graphene or modified graphene are incorporated in the preparation process of polymer, by the method Lai
Improve the interaction force between bi-material, reach the purpose preparing stability of composite materials.In-situ method needs Graphene is entered
Row is modified, introduces functional group and makes to reach In-situ reaction by the effect of functional group between modified graphene and polymeric matrix
Purpose, will Graphene be grafted on the strand of polymer.
After the research of Graphene modified polyacrylate emulsion is concentrated mainly on graphene oxide and polymer emulsion blending
It is then reduced into Graphene, thus reaching the purpose preparing polyacrylate/Graphene complex emulsions.In-situ method prepares polyacrylic acid
The report of ester/Graphene complex emulsions is less, and the solid content of the complex emulsions prepared is 20% about.
Content of the invention
It is an object of the invention to provide a kind of in-situ method prepares high solids content graphene oxide graft polypropylene acid esters being combined
The method of emulsion, prepared solid content, ultimate strength and the higher complex emulsions of water absorption rate.
The technical solution adopted in the present invention is：
In-situ method prepare high solids content graphene oxide grafted polyacrylic acid ester composite emulsion method it is characterised in that：
Realized by following steps：
Step one：The preparation of double bond graphene oxide：
In 100mL there-necked flask, add 0.2-0.5 part graphene oxide, 25-40 part thionyl chloride and 0.5-0.8 part
DMF, supersound process 30-90min；
Plus reflux logical nitrogen, from room temperature to 50-80 DEG C, it is incubated 24-48h；
It is cooled to room temperature, add 20-26 part DMF, rotary evaporation 1-2h at 40-55 DEG C；
Add 0.10-0.25 part triethylamine and 0.15-0.30 part 2-(Acryloyloxy)ethanol, stirring at normal temperature 6-12h, placed
At night, remove supernatant；
Add 500 parts of distilled water sucking filtration, use distilled water wash solid sample, the black powder obtaining is dissolved in 20-50 part
In distilled water, add 0.2-0.5 part sodium lauryl sulphate, supersound process 10-40min, lyophilization obtains double bondization oxidation
Graphene；
Step 2：The preparation of graphene oxide graft polypropylene acid esters high solids content complex emulsions：
Double bond graphene oxide, the dodecane of 2.0-3.5 part of 0.01-0.04 part is added in 100mL there-necked flask
Base sodium sulfate and distilled water 24-34 part, stirring makes its mix homogeneously, supersound process 15-30min；
After being warming up to 75-80 DEG C, add the mixed liquor of 0.1-0.4 part Ammonium persulfate. and 2.3-9.0 part distilled water, stirring
10min；Deca acrylic acid 0.6-2.4 part, methyl methacrylate 4-10 part, butyl acrylate 10-18 part and initiator solution,
Initiator solution is formulated by the Ammonium persulfate. of 0.1-0.4 part and the distilled water of 2.3-9.0 part, and 60-120min adds, insulation
60min, discharging.
The present invention has advantages below：
Double bond graphene oxide is introduced in the preparation process of polyacrylate dispersion the present invention, is prepared for high solids content
Complex emulsions.This patent is the interaction improving Graphene and polyacrylate molecular in emulsion, to graphene oxide
Carry out the modification of double bond, introduce vinyl on its surface, polyacrylate dispersion is being incorporated into by suitable technique
Preparation process in, by the reaction between vinyl, reach the purpose of graphene oxide graft polypropylene acid esters, here basis
On the technique of emulsion polymerization is designed, polymerization early stage makes double bond graphene oxide fully divide by the effect of emulsifying agent
Dissipate；Add part initiator in advance, make a large amount of absorption initiators in double bond graphene oxide layer, be that later stage glycerol polymerization carries
For more reaction site, thus preparing the high complex emulsions of solid content.So make graphene oxide pass through vinyl it
Between radical reaction be grafted in polyacrylate molecular, form stable covalent bond between the two, using graphite alkenes
The good physical and mechanical propertiess of material are reaching the potentiation to polyacrylate molecular, and then show good mechanics
Performance.Additionally, the introducing of graphene oxide makes the space of molecule interchain increase, beneficial to the entrance of hydrone, to composite
Wettability or hygroscopicity are obviously improved effect.
Tests prove that, the preparation method of the present invention can obtain the complex emulsions that solid content is 40% about, and Composite Milk
Compared to pure-acrylic emulsion, ultimate strength improves 40% to the film forming of liquid, and elongation at break is basically unchanged, and water absorption rate improves 100%.
Specific embodiment
With reference to specific embodiment, the present invention will be described in detail.
Double bond graphene oxide is introduced in the preparation process of polyacrylate dispersion the present invention, is prepared for high solids content
Complex emulsions.This patent is the interaction improving Graphene and polyacrylate molecular in emulsion, to graphene oxide
Carry out the modification of double bond, introduce vinyl on its surface, polyacrylate dispersion is being incorporated into by suitable technique
Preparation process in, by the reaction between vinyl, reach that to prepare high solids content graphene oxide graft polypropylene acid esters multiple
Close the purpose of emulsion.Graphene oxide is so made to be grafted to polyacrylic acid ester molecule by the radical reaction between vinyl
On chain, form stable covalent bond between the two, reached to poly- third using the good physical and mechanical propertiess of graphite alkenes material
The potentiation of olefin(e) acid ester molecule chain, and then show good mechanical property.Additionally, the introducing of graphene oxide makes molecule
The space of interchain increases, and beneficial to the entrance of hydrone, is obviously improved effect to composite wettability or hygroscopicity.
In-situ method involved in the present invention prepares the side of high solids content graphene oxide grafted polyacrylic acid ester composite emulsion
Method, is realized by following steps（Consumption in following steps refers both to mass parts）：
Step one：The preparation of double bond graphene oxide：
In 100mL there-necked flask, add 0.2-0.5 part graphene oxide（GO）, 25-40 part thionyl chloride（SOCl2）
With 0.5-0.8 part DMF（DMF）, supersound process 30-90min；
Plus reflux logical nitrogen, from room temperature to 50-80 DEG C, it is incubated 24-48h；
It is cooled to room temperature, add 20-26 part DMF（DMF）, rotary evaporation 1-2h at 40-55 DEG C；
Add 0.10-0.25 part triethylamine and 0.15-0.30 part 2-(Acryloyloxy)ethanol（HEA）, stirring at normal temperature 6-12h, put
Put overnight, remove supernatant；
Add 500 parts of distilled water sucking filtration, use distilled water wash solid sample, the black powder obtaining is dissolved in 20-50 part
In distilled water, add 0.2-0.5 part sodium lauryl sulphate（SDS）, supersound process 10-40min, lyophilization obtains double bond
Graphene oxide；
Step 2：The preparation of graphene oxide graft polypropylene acid esters high solids content complex emulsions：
Double bond graphene oxide, the dodecane of 2.0-3.5 part of 0.01-0.04 part is added in 100mL there-necked flask
Base sodium sulfate（SDS）With distilled water 24-34 part, stirring makes its mix homogeneously, supersound process 15-30min；
After being warming up to 75-80 DEG C, add 0.1-0.4 part Ammonium persulfate.（APS）With the mixed liquor of 2.3-9.0 part distilled water,
Stirring 10min；Deca acrylic acid（AA）0.6-2.4 part, methyl methacrylate（MMA）4-10 part, butyl acrylate（BA）10-
18 parts and initiator solution, initiator solution is by the Ammonium persulfate. of 0.1-0.4 part（APS）Prepare with the distilled water of 2.3-9.0 part
Form, 60-120min adds, be incubated 60min, discharging.
Embodiment 1：
Step one：The preparation of double bond graphene oxide：
In 100mL there-necked flask, add 0.2 part of graphene oxide（GO）, 25 parts of thionyl chlorides（SOCl2）With 0.5 part
DMF（DMF）, supersound process 30min；
Plus reflux logical nitrogen, from room temperature to 50 DEG C, it is incubated 24h；
It is cooled to room temperature, add 20 parts of DMFs（DMF）, rotary evaporation 1h at 40 DEG C；
Add 0.10 part of triethylamine and 0.15 part of 2-(Acryloyloxy)ethanol（HEA）, stirring at normal temperature 6h, stand overnight, remove on
Clear liquid；
Add 500 parts of distilled water sucking filtration, use distilled water wash solid sample, the black powder obtaining is dissolved in 20 parts of distillations
In water, add 0.2 part of sodium lauryl sulphate（SDS）, supersound process 10min, lyophilization obtains double bond graphene oxide；
Step 2：The preparation of graphene oxide graft polypropylene acid esters high solids content complex emulsions：
The double bond graphene oxide of 0.01 part of addition, 2.0 parts of sodium lauryl sulphate in 100mL there-necked flask
（SDS）With 24 parts of distilled water, stirring makes its mix homogeneously, supersound process 15min；
After being warming up to 75 DEG C, add 0.1 part of Ammonium persulfate.（APS）With the mixed liquor of 2.3 parts of distilled water, stir 10min；Drip
Plus acrylic acid（AA）0.6 part, methyl methacrylate（MMA）4 parts, butyl acrylate（BA）10 parts and initiator solution, cause
Agent solution is by 0.1 part of Ammonium persulfate.（APS）It is formulated with 2.3 parts of distilled water, 60min adds, be incubated 60min, discharging.
Embodiment 2：
Step one：The preparation of double bond graphene oxide：
In 100mL there-necked flask, add 0.35 part of graphene oxide（GO）, 32 parts of thionyl chlorides（SOCl2）With 0.65
Part DMF（DMF）, supersound process 60min；
Plus reflux logical nitrogen, from room temperature to 65 DEG C, it is incubated 36h；
It is cooled to room temperature, add 23 parts of DMFs（DMF）, rotary evaporation 1.5h at 47 DEG C；
Add 0.17 part of triethylamine and 0.22 part of 2-(Acryloyloxy)ethanol（HEA）, stirring at normal temperature 9h, stand overnight, remove on
Clear liquid；
Add 500 parts of distilled water sucking filtration, use distilled water wash solid sample, the black powder obtaining is dissolved in 35 parts of distillations
In water, add 0.35 part of sodium lauryl sulphate（SDS）, supersound process 25min, lyophilization obtains double bond graphite oxide
Alkene；
Step 2：The preparation of graphene oxide graft polypropylene acid esters high solids content complex emulsions：
The double bond graphene oxide of 0.02 part of addition, 2.7 parts of sodium lauryl sulphate in 100mL there-necked flask
（SDS）With 29 parts of distilled water, stirring makes its mix homogeneously, supersound process 22min；
After being warming up to 77 DEG C, add 0.2 part of Ammonium persulfate.（APS）With the mixed liquor of 5.6 parts of distilled water, stir 10min；Drip
Plus acrylic acid（AA）1.5 parts, methyl methacrylate（MMA）7 parts, butyl acrylate（BA）14 parts and initiator solution, cause
Agent solution is by 0.2 part of Ammonium persulfate.（APS）It is formulated with 5.6 parts of distilled water, 90min adds, be incubated 60min, discharging.
Embodiment 3：
Step one：The preparation of double bond graphene oxide：
In 100mL there-necked flask, add 0.5 part of graphene oxide（GO）, 40 parts of thionyl chlorides（SOCl2）With 0.8 part
DMF（DMF）, supersound process 90min；
Plus reflux logical nitrogen, from room temperature to 80 DEG C, it is incubated 48h；
It is cooled to room temperature, add 26 parts of DMFs（DMF）, rotary evaporation 2h at 55 DEG C；
Add 0.25 part of triethylamine and 0.30 part of 2-(Acryloyloxy)ethanol（HEA）, stirring at normal temperature 12h, stand overnight, remove on
Clear liquid；
Add 500 parts of distilled water sucking filtration, use distilled water wash solid sample, the black powder obtaining is dissolved in 50 parts of distillations
In water, add 0.5 part of sodium lauryl sulphate（SDS）, supersound process 40min, lyophilization obtains double bond graphene oxide；
Step 2：The preparation of graphene oxide graft polypropylene acid esters high solids content complex emulsions：
The double bond graphene oxide of 0.04 part of addition, 3.5 parts of sodium lauryl sulphate in 100mL there-necked flask
（SDS）With 34 parts of distilled water, stirring makes its mix homogeneously, supersound process 30min；
After being warming up to 80 DEG C, add 0.4 part of Ammonium persulfate.（APS）With the mixed liquor of 9.0 parts of distilled water, stir 10min；Drip
Plus acrylic acid（AA）2.4 parts, methyl methacrylate（MMA）10 parts, butyl acrylate（BA）18 parts and initiator solution, cause
Agent solution is by 0.4 part of Ammonium persulfate.（APS）It is formulated with 9.0 parts of distilled water, 120min adds, be incubated 60min, go out
Material.
The innovative point of the present invention focuses on in-situ method and high solids content, graphene oxide is carried out with the modified purpose of double bondization and is
It is in order that it can carry out chemical reaction with polyacrylate, form chemical bond, rather than physical blending.Normally due to technology
Limit, the solid content of polyacrylate dispersion and modified graphene oxide complex emulsions is relatively low, compound according to present invention preparation
Emulsion, solid content can reach 40% about, and the intensity of emulsion film forming improves 40%, and elongation at break is basically unchanged, and water absorption rate carries
High by 100%.
Present disclosure is not limited to cited by embodiment, and those of ordinary skill in the art pass through to read description of the invention
And any equivalent conversion that technical solution of the present invention is taken, the claim being the present invention covered.
Claims (1)
1. in-situ method prepare high solids content graphene oxide grafted polyacrylic acid ester composite emulsion method it is characterised in that：
Realized by following steps：
Step one：The preparation of double bond graphene oxide：
In 100mL there-necked flask, add 0.2-0.5 part graphene oxide, 25-40 part thionyl chloride and 0.5-0.8 part N, N-
Dimethylformamide, supersound process 30-90min；
Plus reflux logical nitrogen, from room temperature to 50-80 DEG C, it is incubated 24-48h；
It is cooled to room temperature, add 20-26 part DMF, rotary evaporation 1-2h at 40-55 DEG C；
Add 0.10-0.25 part triethylamine and 0.15-0.30 part 2-(Acryloyloxy)ethanol, stirring at normal temperature 6-12h, stand overnight, go
Fall supernatant；
Add 500 parts of distilled water sucking filtration, use distilled water wash solid sample, the black powder obtaining is dissolved in the distillation of 20-50 part
In water, add 0.2-0.5 part sodium lauryl sulphate, supersound process 10-40min, lyophilization obtains double bond graphite oxide
Alkene；
Step 2：The preparation of graphene oxide graft polypropylene acid esters high solids content complex emulsions：
Double bond graphene oxide, the dodecyl sulfur of 2.0-3.5 part of 0.01-0.04 part is added in 100mL there-necked flask
Sour sodium and distilled water 24-34 part, stirring makes its mix homogeneously, supersound process 15-30min；
After being warming up to 75-80 DEG C, add the mixed liquor of 0.1-0.4 part Ammonium persulfate. and 2.3-9.0 part distilled water, stir 10min；
Deca acrylic acid 0.6-2.4 part, methyl methacrylate 4-10 part, butyl acrylate 10-18 part and initiator solution, initiator
Solution is formulated by the Ammonium persulfate. of 0.1-0.4 part and the distilled water of 2.3-9.0 part, and 60-120min adds, and is incubated 60min,
Discharging.
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