CN114438605A - Janus fiber wet-state adhesive and preparation method thereof - Google Patents
Janus fiber wet-state adhesive and preparation method thereof Download PDFInfo
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- CN114438605A CN114438605A CN202011235387.0A CN202011235387A CN114438605A CN 114438605 A CN114438605 A CN 114438605A CN 202011235387 A CN202011235387 A CN 202011235387A CN 114438605 A CN114438605 A CN 114438605A
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- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 4
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 3
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Images
Classifications
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a Janus fiber wet-state adhesive suitable for an aqueous/oily environment, which has a side-by-side (side-by-side) axial parallel structure, namely, two sides or more than two sides of semi-fibers are closely attached and extend in the axial direction, at least one side of each axial side is dissolved or swelled in an aqueous phase or oil phase solvent, and the components of at least one side are different from those of other sides. The Janus fiber wet state adhesive has 0.3N/cm on the surface of a water-containing or oil-containing substrate or the surface of the substrate under the humidity condition of 50-100% RH2The Janus fiber wet adhesive has the advantages of low cost, simplicity in preparation, capability of realizing wet adhesion in water-containing and oil-containing environments, and wide application prospect.
Description
Technical Field
The invention relates to the field of amphiphilic adhesive materials, in particular to a Janus fiber wet-state adhesive suitable for a water/oil-containing environment.
Background
With the increasing demand of adhesive materials in the fields of medical treatment, industry, polar scientific research, construction and the like, the application range of the adhesive materials is widened continuously, the application conditions are more rigorous, and how to realize or maintain high interface adhesive strength in a wet environment containing water or oil becomes a common problem faced by a novel wet adhesive material.
Prior art document 1: "A wet-tolerant adhesive tape absorbed by technical matters in sections of octopi" (Nature2017,546,396.) discloses an octopus-imitating suction cup structure adhesive tape which can realize adhesion under dry state, wet environment, water and oil at the same time, but the technology needs complicated structure design and the preparation process is complicated.
Prior document 2: "Tough adhesion of nucleic acid-labeled gels in two solvents" (adv. Funct. Mater.2019,29,1900450.) discloses a gel adhesive tape based on nucleic acid base grafting, which can realize adhesion under organic solvent, oil and water at the same time, but the adhesive tape obtained by the same method needs complicated organic synthesis steps and has higher cost.
In addition, both ultralyophobic fibrous adhesives (prior art 3, "Liquid-super-hydrophobic fibrous adhesives", adv. mater.2020,2000497) and shape memory polymer-based adhesive patches (prior art 4, (Reversible undersware drive adhesion of a shape memory polymer) adv. mater.interfaces2019,6,1801542) suffer from the problem of failing to form an adhesive bond to a wet substrate surface in more cases, and face the complexity of the process.
Therefore, how to prepare a novel wet adhesion material capable of realizing wet adhesion in a water-containing environment and an oil-containing environment in a large scale by using a simple method, and the adhesion is carried out aiming at various water phase or oil phase liquid environments so as to expand the use scenes of the novel wet adhesion material is the research focus of the invention.
Disclosure of Invention
The invention aims to provide the Janus fiber adhesive which is low in cost, simple to prepare and capable of achieving wet adhesion in water-containing and oil-containing environments.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a Janus fiber wet adhesive suitable for an aqueous/oily environment, which has a side-by-side (side-by-side) axially parallel structure, namely, two sides or more than two sides of the Janus fiber wet adhesive are closely attached and extend in the axial direction, wherein the axial sides meet the following conditions:
(1) at least one side is dissolved or swelled in the water phase or oil phase solvent;
(2) at least one side has a composition different from the other side components;
wherein the Janus fiber wet-state adhesive has an adhesive strength of 0.3N/cm on the surface of an aqueous or oily substrate or on the surface of the substrate in an environment of 50-100% RH humidity2The above;
wherein the shoulder-by-shoulder (side-by-side) axially parallel structure is that two sides or more than two sides of the half fiber components are closely attached and extend in parallel in the axial direction, wherein the half fiber components are continuous on at least one side and are arranged in parallel side by side or in spiral alternation, wherein the fiber diameter is 0.1-1000 μm, and the preferable diameter is 0.5-10 μm;
in the Janus fiber wet-state adhesive, the side-by-side axial parallel structure preferably has two side-by-side axial parallel structures, wherein the sectional areas of the two sides are equal or the sectional area of one side is larger than that of the other side; the regulation and control of the sectional areas on the two sides mainly depend on the dosage and the curing rate of each side in the spinning process;
the phrase "at least one side is dissolved or swollen in a water phase or oil phase solvent" as used herein means that, due to the difference in solubility to water, at least one side component is dissolved or swollen with water, and the remaining side component is insoluble with water; or at least one side component is dissolved or swelled with oil due to different solubilities of the oil phase solvents, and the other side components are not dissolved with oil; or all side components are dissolved or swollen in water; or all the side components are dissolved or swelled in the oil phase solvent;
wherein the component which is dissolved or swelled in water is a combination comprising one or more of polyvinylpyrrolidone, polyacrylic acid and salts thereof, polyethylene glycol, polyacrylamide, polyvinyl alcohol, cellulose acetate, polyvinyl ether, poly-2-acrylamide-2-methylpropanesulfonic acid, waterborne polyurethane and carboxyl-containing rubber, and forms a viscous component with the viscosity of more than 50 mPa.s; the components which are dissolved or swelled with oil are one or a combination of more of polyurethane, polyvinyl butyral, polystyrene, polyvinylidene fluoride, polysulfone, polyvinylpyrrolidone, polyacrylic acid and salts thereof, polyether sulfone, polyvinyl chloride, chlorinated polyethylene, chlorinated polypropylene, polysiloxane, polyimide, polyacrylonitrile, polycarbonate, epoxy resin, hexyl methacrylate and halogen-containing rubber, and a viscous component with the viscosity of more than 50mPa.s is formed;
in a preferred scheme, the Janus fiber wet-state adhesive is prepared by using a side-by-side electrostatic spinning method, a side-by-side micro-fluidic spinning method, a side-by-side melt extrusion method, an electric force injection method, a single-side modification method and a deposition hydrolysis method;
wherein, the method is further preferably realized by a side-by-side electrostatic spinning process according to the following steps:
a) dissolving different components dissolved or swelled with water or oil in similar or same solvent respectively, stirring uniformly to obtain electrostatic spinning solution,
b) and respectively filling the electrostatic spinning solutions with different components into a syringe, and passing through an electrostatic spinning nozzle with a side-by-side structure, wherein the flow rates of the electrostatic spinning solution and the electrostatic spinning nozzle are controlled within 0.2-2mL/h, so as to prepare the Janus fiber wet adhesive.
The invention also provides a method for adhering the Janus fiber wet-state adhesive in an aqueous or oil-containing environment, which comprises the following steps: covering the Janus fiber wet adhesive on the surface of a water-containing or oil-containing substrate, standing for a plurality of minutes under certain pre-pressure to form an adhesive phase to realize adhesion, or in a humidity environment with 50-100% RH, adhering the Janus fiber wet adhesive on the surface of the substrate under certain pre-pressure, standing for a plurality of minutes to form an adhesive phase to realize adhesion;
wherein the aqueous environment includes, but is not limited to: ultrapure water, seawater, river water, acidic beverages, alkaline beverages, and the like; oily environments include, but are not limited to: a substrate covered by one or a combination of more of toluene, chloroform, chlorobenzene, dichloromethane, cyclohexanone, acetone, N 'N-dimethylformamide, N' N-dimethylacetamide, dimethyl sulfoxide and ethylene glycol or a substrate under the humidity condition of 50-100% RH;
the Janus fiber wet-state adhesive obtained by the invention can be applied to the surface of a water-containing or oil-containing wet substrate for adhesion, and particularly can be applied to the fields of water pipelines, oil pipeline repairing, chemical reagent sample marking, sterile medical instrument marking, wound dressings and the like.
The principle by which such wet adhesives can adhere to an aqueous or oily moist substrate surface or to a substrate surface under humidity conditions of 50-100% RH is: the Janus fiber wet-state adhesive can be subjected to multiphase dissolution-infiltration-adhesion, namely in a water-containing wet environment or a water-containing substrate surface, at least one side of the Janus fiber is subjected to swelling and dissolution of a hydrophilic component to form an adhesion phase to realize interface adhesion, and the other side undissolved component is used as a support phase to provide a framework of an adhesive tape to realize adhesion in the water-containing environment; similarly, in a humid environment containing oil (containing organic solvent) or a substrate surface containing oil (containing organic solvent), the oleophilic component of at least one side of the Janus fiber swells and dissolves to form an adhesive phase to achieve interfacial adhesion, while the undissolved component of the other side serves as a support phase to provide a skeleton of the adhesive tape to achieve adhesion of the oil-containing environment. Another adhesion scenario is: the Janus fibers swell and dissolve on both sides of the aqueous or oily surface simultaneously to form an adhesive glue to achieve adhesion.
The invention has the beneficial effects that:
the invention integrates the components which are dissolved/swelled with water or oil into a single Janus fiber, thereby effectively solving the problems of realizing both water-containing environment and oil-containing environment.
Furthermore, the components dissolved/swelled when meeting water and the components dissolved/swelled when meeting oil can be specifically selected, so that the components have good adhesion effects in different liquid environments, and meanwhile, the insoluble phase can also provide good mechanical support, so that the effect of supporting phase infiltration adhesion can be formed; a double dissolving/swelling polymer system can also be selected to form the Janus fiber adhesive glue, so that various functionalized adhesive effects are generated;
the invention further researches the adhesion performance of different polymer components on different matrix surfaces, finally establishes the adhesion optimization selection of structure-material-liquid phase-substrate, and meets the specific requirements such as different substrate conditions, different solvent environments, different adhesion requirements and different support requirements by regulating and controlling the specific Janus adhesion material.
The method is simple to prepare and low in price, and has wide application prospects in the fields of repairing of water pipelines and oil pipelines, marking of samples such as chemical reagents and the like, rapid modification of surfaces, bonding of heterogeneous surfaces, marking of sterile medical instruments, wound dressings and the like.
Drawings
FIG. 1: janus fiber cross-sectional schematic
FIG. 2: the Janus fibers prepared in example 1 are shown to dissolve when wetted in an aqueous/oily toluene-containing environment.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to specific embodiments. The following examples are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of the invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
[ Janus fiber ]
The structure of the Janus structure (Janus structure) is known as ancient roman bilateral god Janus (Janus) and consists of two semi-structures (e.g. hemispheres, etc.) with different compositions and functions. In this patent, the Janus fiber is composed of two or more semi-fibers with different components and functions, specifically, the semi-fibers dissolved or swelled with water and/or the semi-fibers dissolved or swelled with oil. Further, the water-soluble or swelling semi-fiber component is selected from one or a combination of more of polyvinylpyrrolidone, polyacrylic acid and salts thereof, polyethylene glycol, polyacrylamide, polyvinyl alcohol, cellulose acetate, polyvinyl ether, poly-2-acrylamide-2-methyl propanesulfonic acid, waterborne polyurethane and carboxyl-containing rubber; the semi-fiber component which is dissolved or swelled with oil is selected from one or more of polyurethane, polyvinyl butyral, polystyrene, polyvinylidene fluoride, polysulfone, polyvinylpyrrolidone, polyacrylic acid and salts thereof, polyether sulfone, polyvinyl chloride, chlorinated polyethylene, chlorinated polypropylene, polysiloxane, polyimide, polycarbonate, epoxy resin, polyacrylonitrile, hexyl methacrylate and halogen-containing rubber.
Different polymer components have different dissolution/swelling under different liquid phase systemsThe invention finds that the viscosity of the polymer in a specific water phase/oil phase solvent is more than 50mPa.s through the selection of the polymer, the regulation of the molecular weight and the like, and the polymer can have at least 0.3N/cm on the surface of the substrate2Thus the Janus fibers can take advantage of the effect of the polymer dissolving/swelling in solvent to be tacky and are suitable for wet adhesion applications containing liquid surfaces.
[ preparation method of Janus fiber wet adhesive ]
The Janus fiber wet-state adhesive can be prepared by using a side-by-side electrostatic spinning method, a side-by-side micro-fluidic spinning method, a side-by-side melt extrusion method, an electrodynamic force jet method, a single-side modification method and a deposition hydrolysis method.
Preferably, the Janus fiber wet-state adhesive is prepared by utilizing a side-by-side electrospinning technology, and is specifically prepared by the following steps:
a) dissolving different components dissolved or swelled with water or oil in similar solvents respectively, stirring uniformly to obtain electrostatic spinning solution,
b) and (3) respectively filling the electrostatic spinning solutions with different components into an injector, and controlling the flow rates of the electrostatic spinning solutions to be within 0.2-2mL/h through an electrostatic spinning nozzle with a side-by-side structure to prepare the Janus fiber wet-state adhesive.
Different polymer components which dissolve or swell when meeting water or oil need to be dissolved and spun by similar or same solvents, so that fixed polymer types and the collocation of organic solvents can be further selected. Preferred are hydrophilic-lipophilic combinations of Polystyrene (PS)/polyvinylpyrrolidone (PVP), polyvinyl butyral (PVB)/polyacrylic acid (PAA), Polystyrene (PS)/polyacrylic acid (PAA), Polyurethane (PU)/polyvinylpyrrolidone (PVP), Polyacrylonitrile (PAN)/polyvinylpyrrolidone (PVP), polyvinylidene fluoride (PVDF)/polyvinylpyrrolidone (PVP), Polyurethane (PU)/polyacrylic acid (PAA), Polyacrylonitrile (PAN)/polyacrylic acid (PAA), polyvinylidene fluoride (PVDF)/polyacrylic acid (PAA). The organic solvent is N 'N-Dimethylformamide (DMF) or N' N-dimethylformamide (DMAc), has good dissolving effect on the fixed polymer types, is favorable for electrostatic spinning, and can promote the curing of the Janus fibers by adding a small amount of volatile solvent.
The following will explain the process of the present application by way of specific examples and comparative examples and fully evaluate the effects of the practice. Unless otherwise indicated, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.
Example 1:
the preparation method of the Janus fiber wet adhesive is realized by the following steps:
1) dissolving polyvinylpyrrolidone (PVP) dissolved in water and Polystyrene (PS) dissolved in oil in N', N-Dimethylformamide (DMF) at concentrations of 15 wt% and 27 wt%, respectively, and stirring at normal temperature overnight to obtain transparent and uniform electrostatic spinning solution.
2) The PVP + PS Janus fiber adhesion material is prepared by a side-by-side electrostatic spinning method. PVP and PS electrospinning solutions were separately filled into 5mL syringes. Setting the flow rate of fluid to be 1mL/h by a micro sample injection pump, setting the receiving distance to be 24.5cm, setting the voltage to be about 14.3kV, and setting the spinning time to be about 3 hours to obtain the PVP + PS Janus fiber adhesive material to be tested.
Example 2
The Janus fiber wet adhesive was prepared in a manner similar to that of example 1, wherein the water-soluble polymer was polyvinylpyrrolidone (PVP) and the oil-soluble polymer was polyvinyl butyral (PVB).
Example 3
The Janus fiber wet adhesive was prepared in a manner similar to example 1, wherein the water-soluble polymer was polyacrylic acid (PAA) and the oil-soluble polymer was polyvinyl butyral (PVB).
Example 4
The Janus fiber wet adhesive was prepared in a manner similar to that of example 1, wherein the water-soluble polymer was polyacrylic acid (PAA) and the oil-soluble polymer was Polystyrene (PS).
Example 5
The Janus fiber wet adhesive was prepared in a manner similar to that of example 1, wherein the water-soluble polymer was polyvinylpyrrolidone (PVP) and the oil-soluble polymer was Polyurethane (PU).
Example 6
The Janus fiber wet adhesive was prepared in a manner similar to that of example 1, wherein the water-soluble polymer was polyvinylpyrrolidone (PVP) and the oil-soluble polymer was Polyacrylonitrile (PAN).
Example 7
The preparation method of the Janus fiber wet adhesive is similar to that of example 1, wherein the polymer dissolved in water is polyvinylpyrrolidone (PVP), and the polymer dissolved in oil is polyvinylidene fluoride (PVDF).
Example 8
The Janus fiber wet adhesive was prepared in a manner similar to that of example 1, wherein the water-soluble polymer was polyacrylic acid (PAA) and the oil-soluble polymer was Polyurethane (PU).
Example 9
The Janus fiber wet adhesive was prepared in a manner similar to that of example 1, wherein the water-soluble polymer was polyacrylic acid (PAA) and the oil-soluble polymer was Polyacrylonitrile (PAN).
Example 10
The Janus fiber wet adhesive was prepared in a manner similar to that of example 1, wherein the water-soluble polymer was polyacrylic acid (PAA) and the oil-soluble polymer was polyvinylidene fluoride (PVDF).
Comparative example 1:
preparation of PVP fiber adhesive material
1) Dissolving a water-soluble polymer polyvinylpyrrolidone (PVP) in N', N-Dimethylformamide (DMF) at a concentration of 17 wt%, and stirring overnight at normal temperature to obtain a transparent and uniform electrostatic spinning solution.
2) The PVP fiber adhesive material is prepared by a single-needle electrostatic spinning method. The PVP electrospinning solution was poured into a 5mL syringe. Setting the flow rate of the fluid to be 1mL/h by the micro sample injection pump, setting the receiving distance to be 24.5cm, setting the voltage to be about 10.91kV, and setting the spinning time to be about 3 hours to obtain the PVP fiber adhesive material to be tested.
Comparative example 2:
preparation of PS fiber adhesive material
1) The oil-soluble polymer Polystyrene (PS) was dissolved in N' N-Dimethylformamide (DMF) at a concentration of 30 wt%, and stirred overnight at room temperature to obtain a transparent and uniform electrospinning solution.
2) The PS fiber adhesive material is prepared by a single-needle electrostatic spinning method. The PS electrospinning solution was poured into a 5mL syringe. Setting the flow rate of fluid to be 1mL/h, the receiving distance to be 24.5cm, the voltage to be about 14.5kV and the spinning time to be about 3 hours by the micro-sampling pump to obtain the PS fiber adhesive material to be tested.
The test method comprises the following steps:
1. wet adhesion of oily environments
Cutting different substrates into 1cm multiplied by 3cm, respectively carrying out ultrasonic cleaning for 30min by acetone and ethanol, carrying out high-purity nitrogen blow-drying, carrying out air plasma treatment for 20min, respectively dropwise adding 5 mu L of oil phase reagent into each of the two treated substrates, cutting the Janus fiber wet adhesive into the size of 1cm multiplied by 1cm, vertically placing the substrates dropwise added with oil, placing the adhesives of examples 1-10 and comparative examples 1 and 2 in the middle, testing the normal adhesion force after standing for 9min, and independently measuring each group of samples for at least 3 times.
The oil phase reagents are as follows in sequence: toluene, dichloromethane, chlorobenzene, trichloromethane, cyclohexanone, acetone, DMAc, DMF, ethanol, DMSO, ethylene glycol.
2. Wet adhesion of aqueous environments
Cutting different substrates into 1cm multiplied by 3cm, respectively carrying out ultrasonic cleaning for 30min by acetone and ethanol, drying by high-purity nitrogen, carrying out air plasma treatment for 20min, respectively dripping 5 mu L of water into two pieces of substrates treated by the plasma, respectively, cutting a Janus fiber wet adhesive into a size of 1cm multiplied by 1cm, vertically placing the substrates dripped with the water, placing the Janus fiber wet adhesive in the middle, testing the normal adhesive force after standing for 9min, observing whether swelling or dissolving occurs, and independently measuring each group of samples for at least 3 times.
The water phase is as follows in sequence: ultrapure water, seawater, river water, acidic beverages, and alkaline beverages.
The adhesion effects of the examples and comparative examples are summarized in table 1:
it can be seen that the Janus fiber wet adhesive selected in examples 1-10 can form partial adhesion and partial support in different solvent systems, while in the case of comparative example, all adhesion or all non-adhesion exists, so that it can be applied to prepare adhesive tapes with certain support effect in corresponding solvent environment according to examples 1-10.
FIG. 2 is a schematic representation of the dissolution of Janus fibers prepared in example 1 when wetted in an aqueous/oily toluene-containing environment, showing that when wetted with water, the hydrophilic phase PVP polymer in the Janus fibers is dissolved, while the hydrophobic phase PS polymer is not dissolved, forming an adherent support system; when soaked by toluene, the oleophilic phase PS polymer in the Janus fiber is dissolved, the oleophobic phase PVP polymer is not dissolved, and an adhesion support system is formed similarly.
The adhesion strength of the Janus fiber wet adhesive of example 1 to the toluene-containing glass substrates and the water-containing glass substrates of comparative examples 1 and 2 is shown in table 2, and it can be seen that the Janus fiber wet adhesive of example 1 has a desirable adhesion effect both under water-containing conditions and under toluene-containing conditions, whereas both PVP and PS fiber adhesives produce an adhesion effect to substrates in only one of the environments.
TABLE 2 adhesion Strength on toluene/Water-containing glass substrates of example 1 and comparative examples 1-2
| Material | Adhesion to toluene-containing environmentIntensity (N/cm)2) | Adhesive strength (N/cm) in aqueous environment2) |
| Example 1 | 5.7 | 4.6 |
| Comparative example 1 | 6.9 | 0.1 |
| Comparative example 2 | 0.2 | 5.6 |
The adhesion strength of the Janus fiber wet adhesive in example 1 to different substrates containing toluene and water is shown in Table 3, and it can be seen that the Janus fiber wet adhesive in example 1 has a good adhesion effect on different substrates containing toluene and water except for the polytetrafluoroethylene substrate, and can reach 0.3N/cm2The above.
Table 3 example 1 adhesion strength on different substrates containing toluene/water
The adhesion strength of the Janus fiber wet adhesive in example 1 on substrates soaked in different water is shown in Table 4, and it can be seen that the Janus fiber wet adhesive in example 1 has good adhesion effect on the surfaces of substrates soaked in high-salinity seawater, river water rich in microorganisms and beverages with different pH values, and can reach 3.9N/cm2The above.
Table 4 adhesion strength of example 1 on substrates wetted with different water
Although the present invention has been described in detail with reference to the above embodiments, the above description is only for the purpose of facilitating the understanding of the present invention by the skilled in the art, and is not intended to limit the scope of the present invention, so that the equivalent changes and modifications in the shape, structure, and spirit of the present invention described in the claims are included in the scope of the present invention.
Claims (12)
1. A Janus fiber wet-state adhesive suitable for use in an aqueous/oily environment, characterized by: the Janus fiber wet-state adhesive has a side-by-side (side-by-side) axial parallel structure, namely, two sides or more than two sides of the Janus fiber wet-state adhesive are closely attached in the axial direction and extend in a row, wherein the axial sides meet the following conditions:
(1) at least one side is dissolved or swelled in the water phase or oil phase solvent;
(2) at least one side has a composition different from the other side components;
wherein the Janus fiber wet-state adhesive has an adhesive strength of 0.3N/cm on the substrate surface under the moisture condition of water or oil-containing substrate surface or 50-100% RH2The above.
2. The Janus fiber wet-state adhesive according to claim 1, wherein the side-by-side (side-by-side) axially parallel structure is that two or more side-by-side semi-fiber components are closely attached and extend in a row in the axial direction, wherein at least one side of the semi-fiber components is continuous, and are arranged in parallel side-by-side or spirally and alternately, wherein the fiber diameter is 0.1-1000 μm, and the preferred diameter is 0.5-10 μm.
3. The Janus fiber wet adhesive according to any of claims 1-2, wherein the side-by-side axially side-by-side structure is preferably side-by-side axially side-by-side, wherein the cross-sectional area on both sides is comparable or larger than the cross-sectional area on one side.
4. The Janus fiber wet-state adhesive according to any one of claims 1-3, wherein the component which is soluble or swellable in water is a combination comprising one or more of polyvinylpyrrolidone, polyacrylic acid and salts thereof, polyethylene glycol, polyacrylamide, polyvinyl alcohol, cellulose acetate, polyvinyl ether, poly-2-acrylamide-2-methylpropanesulfonic acid, aqueous polyurethane and carboxyl-containing rubber, and forms a viscous component with a viscosity of more than 50 mPa.s.
5. The Janus fiber wet adhesive according to any one of claims 1-3, wherein the component that dissolves or swells upon exposure to oil is a combination comprising one or more of polyurethane, polyvinyl butyral, polystyrene, polyvinylidene fluoride, polyvinyl pyrrolidone, polyacrylic acid and salts thereof, polysulfone, polyethersulfone, polyvinyl chloride, chlorinated polyethylene, chlorinated polypropylene, polysiloxane, polyimide, polyacrylonitrile, polycarbonate, epoxy resin, hexyl methacrylate, halogen-containing rubber, and forms a viscous component having a viscosity of greater than 50 mpa.s.
6. The Janus fiber wet-state adhesive according to any one of claims 1-5, which is prepared by using a side-by-side electrospinning, a side-by-side microfluidic spinning, a side-by-side melt extrusion, an electrodynamic jet method, a single-side modification method and a deposition hydrolysis method.
7. The Janus fiber wet-state adhesive according to one of claims 1-6, which is preferably prepared by a side-by-side electrospinning process, and comprises the following steps:
a) dissolving different components dissolved or swelled with water or oil in similar solvents respectively, stirring uniformly to obtain electrostatic spinning solution,
b) and (3) respectively filling the electrostatic spinning solutions with different components into an injector, and controlling the flow rates of the electrostatic spinning solutions to be within 0.2-2mL/h through an electrostatic spinning nozzle with a side-by-side structure to prepare the Janus fiber wet-state adhesive.
8. The method of adhering a Janus fiber wet adhesive according to any one of claims 1-7 in an aqueous or oily environment: covering the Janus fiber wet adhesive on the surface of a water-containing or oil-containing substrate, standing for a plurality of minutes under certain pre-pressure to form an adhesive phase to realize adhesion, or in a humidity environment with 50-100% RH, adhering the Janus fiber wet adhesive on the surface of the substrate under certain pre-pressure, standing for a plurality of minutes to form the adhesive phase to realize adhesion.
9. The method of adhering according to claim 8, wherein the aqueous environment includes but is not limited to: substrates coated with one or a combination of ultrapure water, seawater, river water, acidic beverages, and alkaline beverages, or substrates at a humidity of 50-100% RH.
10. The method of adhering according to claim 8, wherein the oil-containing environment includes but is not limited to: toluene, chloroform, chlorobenzene, dichloromethane, cyclohexanone, acetone, N 'N-dimethylformamide, N' N-dimethylacetamide, dimethyl sulfoxide and ethylene glycol, or a substrate covered by one or more of them under a humidity condition of 50-100% RH.
11. Use of a Janus fiber wet-state adhesive according to any one of claims 1-7 in the form of an adhesive tape or glue for adhering to an aqueous or oily moist substrate surface or a substrate surface under humidity conditions of 50-100% RH.
12. Use of the Janus fiber wet adhesive according to any one of claims 1 to 7 in the field of water pipelines, oil pipeline repair, marking of chemical reagent samples, marking of sterile medical devices, wound dressings.
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