CN114438605B - 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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- CN114438605B CN114438605B CN202011235387.0A CN202011235387A CN114438605B CN 114438605 B CN114438605 B CN 114438605B CN 202011235387 A CN202011235387 A CN 202011235387A CN 114438605 B CN114438605 B CN 114438605B
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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
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- 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
Abstract
The invention discloses a Janus fiber wet adhesive suitable for a water/oil-containing environment, which has a side-by-side (side-by-side) axial parallel structure, namely, a side-by-side (side-by-side) axial parallel structureTwo or more semi-fibers are closely fitted and extend in a row in the axial direction, at least one side of each side in the axial direction is dissolved or swelled in an aqueous phase or an oil phase solvent and the composition of at least one side is different from the composition of the other sides. The Janus fiber wet adhesive has a content of 0.3N/cm on the surface of a substrate containing water or oil or on the surface of the substrate under a humidity condition of 50-100% RH 2 The Janus fiber wet adhesive has the advantages of low cost, simple 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" (Nature 2017,546, 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 simultaneously realize organic solvent, oil and underwater adhesion, but the adhesive tape obtained by the method also needs complicated organic synthesis steps and is high in cost.
In addition, both ultralyophobic fibrous adhesives (prior art 3, "Liquid-super hydrophobic fibrous adhesives", adv. Mater.2020, 2000497) and shape memory polymer-based adhesives (prior art 4, (Reversible underserver drive adhesion of a flap memory polymer) adv. Mater.interfaces2019,6, 1801542) have the problem of failing to form adhesion to a moist substrate surface in more situations, and face the problem of complicated processes.
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) axial parallel structure, namely, two sides or more than two sides of upper half fibers 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 adhesive has an adhesive strength of 0.3N/cm at the aqueous or oily substrate surface or at the substrate surface in a 50-100% RH humidity environment 2 The above;
wherein the side-by-side axial side-by-side structure is formed by closely fitting and extending two or more side-by-side half fiber components 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 a spiral alternating manner, the fiber diameter is 0.1-1000 μm, and the preferred 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 a viscous component with the viscosity of more than 50mPa.s is formed; 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 (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.
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 an aqueous or oily substrate, standing for a plurality of minutes at a certain pre-pressure to form an adhesive phase, and realizing adhesion, or in a humidity environment with the content of 50-100 percent RH, adhering the Janus fiber wet adhesive on the surface of the substrate at a certain pre-pressure, standing for a plurality of minutes to form an adhesive phase, and realizing adhesion;
wherein the aqueous environment includes, but is not limited to: ultrapure water, seawater, river water, acidic beverages, alkaline beverages, and the like; oil-containing environments include, but are not limited to: a substrate covered with one or a combination of toluene, chloroform, chlorobenzene, dichloromethane, cyclohexanone, acetone, N 'N-dimethylformamide, N' N-dimethylacetamide, dimethylsulfoxide, ethylene glycol or a substrate at a moisture content 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 a substrate surface under conditions of humidity of 50-100% RH is: the Janus fiber wet adhesive can carry out multiphase dissolution-infiltration-adhesion, namely, on the surface of a water-containing wet environment or a water-containing substrate, at least one side of the Janus fiber is swelled and dissolved to form an adhesion phase to realize interface adhesion, and the undissolved components on the other sides are used as a supporting phase to provide a skeleton of an adhesive tape to realize the 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 framework for the adhesive tape to achieve adhesion in the oily environment. Another adhesion scenario is: and swelling and dissolving all sides of the Janus fiber on the surface containing water or oil at the same time to form adhesive glue to realize adhesion.
The beneficial effects of the invention are:
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 also further researches the adhesion performance of different polymer components on different matrix surfaces, finally establishes the adhesion optimization selection of the 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 cost, 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 is a schematic diagram: the dissolution profile of the Janus fibers prepared in example 1 when wetted in an aqueous/toluene-containing oily 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 techniques 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.
The invention discloses a method for preparing a high-viscosity water-phase/oil-phase solvent-based polymer, which has different dissolving/swelling properties under different liquid-phase systems, and the invention discovers that when the viscosity of a polymer in a corresponding specific water-phase/oil-phase solvent is more than 50mPa.s through selection, molecular weight regulation and the like of the polymer, at least 0.3N/cm can be formed on the surface of a substrate 2 Therefore, the Janus fiber can utilize the viscous effect of dissolving/swelling the polymer in the solvent, and is suitable for wet adhesion application containing liquid surface.
[ 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 in water or oil in similar solvents 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.
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 15wt% and 27wt%, 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-state adhesive was prepared similarly to example 1, in which the water-soluble polymer was polyacrylic acid (PAA) and the oil-soluble polymer was polyvinyl butyral (PVB).
Example 4
The preparation method of the Janus fiber wet adhesive is similar to that of example 1, wherein the polymer which is dissolved in water is polyacrylic acid (PAA), and the polymer which is dissolved in oil is 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 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 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 polyvinylpyrrolidone (PVP) which is a polymer dissolved in water into N', N-Dimethylformamide (DMF) at a concentration of 17wt%, and stirring overnight at normal temperature to obtain 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 30wt%, 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 in 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 on the two pieces of substrates treated by the plasma, respectively, cutting the Janus fiber wet adhesive into the size of 1cm multiplied by 1cm, vertically placing the substrates dripped with 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 phases are 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 the fibers are soaked by toluene, the oleophilic phase PS polymer in the Janus fibers is dissolved, and the oleophobic phase PVP polymer is not dissolved, so that an adhesion supporting system is formed.
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 under both water-containing conditions and toluene-containing conditions, whereas the PVP and PS fiber adhesives both produce adhesion effects on substrates in only one of the environments.
Table 2 adhesion strength of example 1 and comparative examples 1-2 on toluene/water glass-containing substrates
| Material | Adhesion strength (N/cm) of toluene-containing environment 2 ) | Adhesive strength (N/cm) in aqueous environment 2 ) |
| 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/cm 2 As described above.
TABLE 3 adhesion Strength of example 1 on different substrates containing toluene/water
The adhesion strength of the Janus fiber wet adhesive of example 1 on substrates soaked in different water is shown in Table 4, and it can be seen that the Janus fiber wet adhesive of example 1 has good adhesion effect on the surfaces of the substrates soaked in high-salinity seawater, river water rich in microorganisms and beverages with different pH values, and can reach 3.9N/cm 2 The above.
Table 4 example 1 adhesion strength on substrates wetted with different waters
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 understanding of the present invention by those skilled in the art, and does not limit the scope of the present invention, so that the equivalent changes and modifications based on the structural features and spirit of the present invention described in the claims are included in the scope of the present invention.
Claims (14)
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 axial parallel structure, namely, more than two semi-fibers 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 the adhesive strength of 0.3N/cm on the surface of an aqueous or oily substrate 2 The above.
2. The Janus fiber wet adhesive of claim 1, wherein the aqueous substrate surface is a substrate surface at a moisture condition of 50-100% rh.
3. The Janus fiber wet-state adhesive according to claim 1, wherein the side-by-side axially parallel structure is formed by closely attaching and extending more than two sides of the half fiber components in a row in the axial direction, wherein at least one side of the half fiber components is continuous and is arranged in parallel side by side or spirally and alternately, and the fiber diameter is 0.1-1000 μm.
4. The Janus fiber wet adhesive of claim 3, wherein the fiber diameter is between 0.5-10 μ ι η.
5. The Janus fiber wet-state adhesive of any one of claims 1-4, wherein the side-by-side axially side-by-side structure is a side-by-side axially side-by-side structure, wherein the cross-sectional area of the two sides is equivalent or the cross-sectional area of one side is larger than that of the other side.
6. The Janus fiber wet-state adhesive according to any one of claims 1-4, 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 50mPa.s.
7. The Janus fiber wet-state adhesive according to any one of claims 1-4, wherein the component which dissolves or swells with 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 with viscosity of more than 50mPa.s.
8. The Janus fiber wet adhesive of any one of claims 1-4, prepared by side-by-side electrospinning, side-by-side microfluidic spinning, side-by-side melt extrusion, electrokinetic spray method, single-sided modification method, deposition hydrolysis method.
9. The Janus fiber wet-state adhesive of claim 8, which is prepared by a side-by-side electrospinning process according to the following steps:
a) Dissolving different components dissolved or swelled in 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.
10. The method of adhering a Janus fiber wet adhesive according to any one of claims 1-9 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, and realizing adhesion.
11. The method of adhering of claim 10, wherein the aqueous environment comprises: one or more of ultrapure water, seawater, river water, acidic beverage and alkaline beverage.
12. The method of adhering of claim 10, wherein the oil-containing environment comprises: toluene, chloroform, chlorobenzene, dichloromethane, cyclohexanone, acetone, N 'N-dimethylformamide, N' N-dimethylacetamide, dimethyl sulfoxide and glycol.
13. Use of a Janus fibre wet adhesive according to any of claims 1-9 in the form of an adhesive tape or glue for adhering to a surface of an aqueous or oily moist substrate.
14. Use of a Janus fibre wet adhesive according to one of claims 1 to 9 in the field of water or oil pipeline repair, chemical agent sample marking, sterile medical device marking, wound dressing.
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| CN103110984A (en) * | 2013-02-20 | 2013-05-22 | 上海典范医疗科技有限公司 | Method for preparing hemostatic polylactic acid anti-adhesion film |
| TWI632259B (en) * | 2014-11-26 | 2018-08-11 | 聚泰環保材料科技股份有限公司 | Method for preparing moisture-absorbing transfer non-woven fabric by using spunbonding method |
| AU2017211684B2 (en) * | 2016-01-27 | 2022-10-06 | Instar Technologies A.S. | Oromucosal nanofiber carriers for therapeutic treatment |
| CN107675360B (en) * | 2017-09-05 | 2019-06-28 | 恩泰环保科技（常州）有限公司 | Polystyrene nano fiber and preparation method thereof |
| CN109778430B (en) * | 2019-01-28 | 2022-03-22 | 吉林农业大学 | Preparation method for preparing Janus structure nano-fiber by using uniaxial electrostatic spinning |
| CN110484184B (en) * | 2019-08-26 | 2020-06-16 | 中国科学院长春应用化学研究所 | Hydrogel adhesive and preparation method and application thereof |
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