TWI672403B - Method for preparing hydrophobic fibers by electrospinning of polymer - Google Patents

Abstract

A method for preparing hydrophobic polymer fibers by electrospinning, which may include the following steps: providing a polymer material including polymethyl methacrylate; providing a solvent including isopropyl alcohol and water; The polymer material is added to the solvent to form a mixed solution; the mixed solution is heated and stirred; and the mixed solution is subjected to electrostatic spinning to produce polymer fibers.

Description

Method for preparing hydrophobic polymer fiber by electrostatic spinning

The invention relates to a method for preparing hydrophobic polymer fibers by electrostatic spinning, in particular to a method for preparing hydrophobic polymer submicron / nanometer fibers by electrostatic spinning with environmentally friendly solvents.

Electrospinning is a technology that can process polymer materials into sub-micron / nano fibers; through electrospinning, fibers suitable for various application fields can be manufactured.

However, most of the current electrospinning processes still use highly toxic solvents (such as methyl chloride, methylene chloride, tetrahydrofuran, toluene, etc.) to dissolve water-insoluble polymers, although these solvents can achieve excellent Compatibility, but will cause harm to the human body and the environment.

At present, some electrospinning processes can use water-soluble polymer materials and non-toxic water as solvents to prepare polymer sub-micron fibers / nanometer fibers, which will not cause harm to the human body and the environment, so it can be achieved The purpose of environmental protection; however, the polymer sub-micron fiber / nano fiber prepared by the above process is still hydrophilic and easily deforms and dissolves in water, so its application is greatly restricted.

In addition, the polymer submicron fiber / nanometer fiber prepared by the current electrospinning process is insufficient in toughness and softness, so it is easy to break; therefore, the polymer submicron fiber prepared by the current electrospinning process / The mechanical properties of nanofibers still need to be improved.

Therefore, how to propose an electrospinning process that can effectively improve the various shortcomings of the existing electrospinning process has become an urgent issue.

In view of the above-mentioned problems of the prior art, one of the objects of the present invention is to provide a method for preparing hydrophobic polymer fibers by electrospinning to solve various problems of the conventional art.

According to one of the objects of the present invention, a method for preparing hydrophobic polymer fibers by electrospinning is proposed, which may include the following steps: providing a polymer material, the polymer material includes polymethyl methacrylate; providing a solvent, the solvent Containing isopropyl alcohol and water; adding a polymer material to a solvent to form a mixed solution; heating and stirring the mixed solution; and electrospinning the mixed solution to produce polymer fibers.

In a preferred embodiment, the polymer fiber may be a polymer submicron fiber or a polymer nanofiber.

In a preferred embodiment, the weight average molecular weight of polymethyl methacrylate may be 200,000 to 800,000.

In a preferred embodiment, the concentration of the polymer material in the mixed solution may be 0.8-1.8 wt%.

In a preferred embodiment, the concentration of water in the solvent may be 10-40% by weight.

In a preferred embodiment, the temperature of electrospinning the mixed solution may be 20-75 ° C.

In a preferred embodiment, the flow rate of electrospinning the mixed solution may be 0.01 to 0.5 mL / min.

In a preferred embodiment, the voltage of electrospinning the mixed solution may be 3.0-30 kV.

In a preferred embodiment, the inner diameter of the needle for electrospinning the mixed solution may be 0.26 ~ 1.0mm.

In a preferred embodiment, the distance between the tip of the needle for electrospinning the mixed solution and the collection plate may be 8-20 cm.

According to one of the objectives of the present invention, a method for preparing hydrophobic polymer fibers by electrospinning is further proposed, which may include the following steps: providing polymer materials including polymethyl methacrylate and polyvinyl acetate Providing a solvent, the solvent containing isopropyl alcohol and water; adding a polymer material to the solvent to form a mixed solution; heating and stirring the mixed solution; and electrospinning the mixed solution to produce polymer fibers.

In a preferred embodiment, the polymer fiber may be a polymer submicron fiber or a polymer nanofiber.

In a preferred embodiment, the weight average molecular weight of polymethyl methacrylate can be 200,000 to 800,000, and the weight average molecular weight of polyvinyl acetate can be 4 to 300,000. The polyvinyl acetate of polymer material The ratio can be 10 ~ 90%.

In a preferred embodiment, the concentration of the polymer material in the mixed solution may be 0.8-15 wt%.

In a preferred embodiment, the concentration of water in the solvent may be 10-40% by weight.

In a preferred embodiment, the temperature of electrospinning the mixed solution may be 20-75 ° C.

In a preferred embodiment, the flow rate of electrospinning the mixed solution may be 0.005 to 0.5 mL / min.

In a preferred embodiment, the voltage of electrospinning the mixed solution may be 2.0-30 kV.

In a preferred embodiment, the inner diameter of the needle for electrospinning the mixed solution may be 0.26 ~ 1.0mm.

In a preferred embodiment, the distance between the tip of the needle for electrospinning the mixed solution and the collection plate is 8-20 cm.

As mentioned above, the method of preparing hydrophobic polymer fibers by electrospinning according to the present invention may have one or more of the following advantages:

(1) In one embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning uses non-toxic water and isopropyl alcohol as solvents, so it will not cause harm to the human body and the environment and can achieve environmental protection the goal of.

(2) In one embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning uses polymer materials containing polymethyl methacrylate and special process parameters, so it can be made to be hydrophobic (ie Polymer sub-micron fiber / nano fiber will not be destroyed by water) Polymer sub-micron fiber / nano fiber is not easy to deform and dissolve in water, so it is more widely used.

(3) In one embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning uses polymer materials including polymethyl methacrylate and polyvinyl acetate and special process parameters, so it can be made Polymer submicron fiber / nano fiber with excellent toughness and softness, so it has better mechanical properties.

(4) In one embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning can prepare high-quality polymer submicron fibers / nano fibers through a simple process, so it can increase the cost without significantly increasing Under the premise to achieve the desired effect.

Hereinafter, an embodiment of a method for preparing a hydrophobic polymer fiber by electrostatic spinning according to the present invention will be described with reference to related drawings.

Please refer to FIG. 1, which is a flow chart of the first embodiment of the method for preparing a hydrophobic polymer fiber by electrostatic spinning according to the present invention. In this embodiment, a polymer material containing poly (methyl methacrylate, PMMA) is used to prepare high molecular submicron fiber / nano fiber; in this embodiment, the weight average of polymethyl methacrylate is The molecular weight may be 200,000 to 800,000; preferably, the weight average molecular weight of polymethyl methacrylate may be 300,000 to 700,000; more preferably, the weight average molecular weight of polymethyl methacrylate may be 400,000 to 600,000.

The solvent used in this embodiment includes isopropanol (2-propanol) and water; in this embodiment, the concentration of water in the solvent may be 10-40% by weight; preferably, the concentration of water in the solvent may be 15-30% %; Better, the concentration of water in the solvent can be 20 ~ 25wt%.

First, add polymethyl methacrylate to the solvent to form a mixed solution, so that the concentration of the polymer material of the mixed solution is 0.8 ~ 1.8wt%; preferably, the concentration of the polymer material of the mixed solution is 1.0 ~ 1.7wt% ; More preferably, the concentration of the polymer material of the mixed solution is 1.2 ~ 1.6wt%.

Next, the mixed solution is heated and stirred, and the mixed solution is electrospinning to produce polymer fibers; the process parameters of electrospinning in this embodiment are shown in Table 1 below: Table 1 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 20 ~ 80% 20 ~ 75 ° C 0.01 ~ 0.5mL / min 3.0 ~ 30kV 0.26 ~ 1.0mm 8 ~ 20cm

Preferably, the process parameters of electrospinning are shown in Table 2 below: Table 2 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 30 ~ 70% 20 ~ 50 ° C 0.02 ~ 0.1mL / min 4.0 ~ 15kV 0.31 ~ 0.6mm 10 ~ 15cm

More preferably, the parameters of the electrospinning process are shown in Table 3 below: Table 3 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 40 ~ 60% 25 ~ 40 ° C 0.02 ~ 0.1mL / min 5.5 ~ 9.5kV 0.33 ~ 0.52mm 10 ~ 15cm

In this embodiment, non-toxic water and isopropyl alcohol are used as solvents. The above-mentioned solvents are non-toxic, so they will not cause harm to human bodies and the environment, so they are more environmentally friendly.

In addition, this embodiment uses a hydrophobic polymer material containing polymethyl methacrylate, and through a special concentration, ratio and process parameters, this hydrophobic polymer material, which is not easily prepared by electrospinning, can pass through the above-mentioned environmentally friendly solvents and Electrospinning preparation of polymer sub-micron fibers / nano fibers not only achieves the purpose of environmental protection, but also can make polymer sub-micron fibers / nano fibers have good hydrophobicity (ie, polymer sub-micron fibers / nano fibers are not Will be destroyed by water), more widely used.

The method of preparing hydrophobic polymer fibers by electrospinning in this embodiment may include the following steps:

Step S11: Provide a polymer material including polymethyl methacrylate.

Step S12: Provide a solvent. The solvent includes isopropyl alcohol and water.

Step S13: Add the polymer material to the solvent to form a mixed solution.

Step S14: heating and stirring the mixed solution.

Step S15: Electrospinning the mixed solution to produce polymer fibers.

Of course, the above is only an example, and the method used in this embodiment may vary according to actual needs, and the present invention is not limited thereto.

Please refer to FIG. 2, which is a flowchart of a second embodiment of the method for preparing a hydrophobic polymer fiber by electrostatic spinning according to the present invention. In this embodiment, a polymer material containing poly (methyl methacrylate) (PMMA) and polyvinyl acetate (poly (vinyl acetate) (PVAc) is used to prepare polymer submicron fiber / nano fiber; In this embodiment, the weight average molecular weight of polymethyl methacrylate can be 200,000 to 800,000, the weight average molecular weight of polyvinyl acetate can be 4 to 300,000, and the proportion of polymer material to polyvinyl acetate can be 10 ~ 90%; preferably, the weight average molecular weight of polymethyl methacrylate can be 300,000 to 700,000, the weight average molecular weight of polyvinyl acetate can be 60,000 to 160,000, the proportion of polymer material polyvinyl acetate It can be 20 ~ 80%; more preferably, the weight average molecular weight of polymethyl methacrylate can be 400,000 to 600,000, the weight average molecular weight of polyvinyl acetate can be 80,000 to 120,000, and the polyvinyl acetate of polymer material The proportion of esters can be 25 to 75%.

The solvent used in this embodiment includes isopropyl alcohol and water; in this embodiment, the concentration of water in the solvent may be 10-40% by weight; preferably, the concentration of water in the solvent may be 15-30% by weight; more preferably The concentration of water in the solvent can be 20 ~ 25wt%.

First, add polymethyl methacrylate and polyvinyl acetate to the solvent to form a mixed solution, so that the concentration of the polymer material of the mixed solution is 0.8 ~ 15wt%; preferably, the concentration of the polymer material of the mixed solution is 1.0 ~ 10wt%; more preferably, the concentration of the polymer material in the mixed solution is 1.5 ~ 6wt%.

Next, the mixed solution is heated and stirred, and the mixed solution is electrospinning to produce polymer fibers; the process parameters of electrospinning in this embodiment are shown in Table 4 below: Table 4 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 20 ~ 80% 20 ~ 75 ° C 0.005 ~ 0.5mL / min 2.0 ~ 30kV 0.26 ~ 1.0mm 8 ~ 20cm

Preferably, the process parameters of electrospinning are shown in Table 5 below: Table 5 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 30 ~ 70% 20 ~ 50 ° C 0.01 ~ 0.15mL / min 2.0 ~ 20kV 0.31 ~ 0.6mm 10 ~ 15cm

More preferably, the parameters of the electrospinning process are shown in Table 6 below: Table 6 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 40 ~ 60% 25 ~ 40 ° C 0.01 ~ 0.15mL / min 2.9 ~ 14kV 0.33 ~ 0.52mm 10 ~ 15cm

Similarly, this embodiment also uses non-toxic and environmentally friendly water and isopropyl alcohol as solvents; in addition, this embodiment uses a hydrophobic polymer material containing polymethyl methacrylate and polyvinyl acetate, and through The special concentration, ratio and process parameters make these hydrophobic polymer materials that are not easy to be prepared by electrospinning can be used to prepare polymer submicron fibers / nano fibers through the above environmentally friendly solvents and electrospinning, which not only achieves the purpose of environmental protection, but also The polymer sub-micron fiber / nano fiber has excellent toughness and softness; therefore, the polymer sub-micron fiber / nano fiber not only has good hydrophobicity (that is, the polymer sub-micron fiber / nano fiber will not be Water damage), and has better mechanical properties, more widely used.

The method of preparing hydrophobic polymer fibers by electrospinning in this embodiment may include the following steps:

Step S21: Provide a polymer material including polymethyl methacrylate and polyvinyl acetate.

Step S22: providing a solvent, the solvent includes isopropyl alcohol and water.

Step S23: Add the polymer material to the solvent to form a mixed solution.

Step S24: heating and stirring the mixed solution.

Step S25: Electrospinning the mixed solution to produce polymer fibers.

Of course, the above is only an example, and the method used in this embodiment may vary according to actual needs, and the present invention is not limited thereto.

It is worth mentioning that most of the current electrospinning processes still use highly toxic solvents to dissolve water-insoluble polymers. Although this solvent can achieve excellent compatibility, it will affect the human body and Environmental hazards. On the contrary, according to the embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning uses non-toxic water and isopropyl alcohol as solvents, so it will not cause harm to the human body and the environment, and can achieve environmental protection. purpose.

In addition, although some of the electrospinning processes can use water-soluble polymer materials and non-toxic water as solvents to prepare polymer submicron fibers / nanometer fibers; however, the polymer Micron fiber / nano fiber is still hydrophilic, easily deformed and dissolved in water, so it is greatly restricted in application. On the contrary, according to the embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning uses polymer materials containing polymethyl methacrylate and special process parameters, so it can be made to be hydrophobic (ie high The molecular submicron fiber / nano fiber will not be destroyed by water). The polymer submicron fiber / nano fiber is not easy to deform and dissolve in water, so it is more widely used.

In addition, the polymer sub-micron fiber / nanometer fiber prepared by the current electrospinning process is insufficient in toughness and softness, so it is easy to break, so the mechanical properties still need to be improved. On the contrary, according to the embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning uses polymer materials including polymethyl methacrylate and polyvinyl acetate and special process parameters, so it can be made into The polymer submicron fiber / nano fiber with excellent toughness and softness has better mechanical properties.

Furthermore, according to the embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning can produce high-quality polymer submicron fibers / nano fibers through a simple process, so it can be premised on not significantly increasing the cost To achieve the desired effect. From the above, it can be seen that the invention has progressive patent requirements.

Please refer to FIG. 3, which is a magnified image of a scanning electron microscope (SEM) of polymer fibers (magnification of 5000 times) of the third embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention . In this embodiment, a polymer material containing polymethyl methacrylate is used to prepare high molecular nanofibers, and the weight average molecular weight of polymethyl methacrylate is about 400,000 to 600,000; The concentration of water and solvent water is about 20.4wt%, and the concentration of the polymer material of the mixed solution is about 1.2wt%; the process parameters of electrospinning in this embodiment are shown in Table 7 below: Table 7 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 45% 30 ° C 0.06mL / min 6.9kV 0.42mm 12cm

As shown in the figure, the polymer fiber prepared with the concentration, ratio and process parameters of this embodiment has a very complete fiber structure.

Please refer to FIG. 4, which is a magnified image of polymer fibers of a scanning electron microscope according to a fourth embodiment of the method for preparing hydrophobic polymer fibers by electrospinning of the present invention. In this embodiment, a polymer material containing polymethyl methacrylate is used to prepare high molecular nanofibers. The weight average molecular weight of polymethyl methacrylate is about 400,000 to 600,000; the solvent used in this embodiment includes isopropyl alcohol and The concentration of water and solvent water is about 20.4wt%, and the concentration of the polymer material of the mixed solution is about 1.6wt%; the process parameters of electrospinning in this embodiment are shown in Table 8 below: Table 8 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 45% 30 ° C 0.05mL / min 5.9kV 0.42mm 12cm

As shown in the figure, the polymer fibers prepared with the concentration, ratio and process parameters of this embodiment also have a very complete fiber structure.

Please refer to FIG. 5 and FIG. 6, which are the fourth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning of the present invention. Enlarged image of polymer fiber after waterproof test (magnification is 5000 times).

Figure 5 shows the fiber structure of the polymer fiber before the waterproof test.

As shown in Figure 6, after the polymer fiber was dripped for 10 minutes, and then placed in a vacuum oven at 60 ° C for one hour, the polymer fiber remained intact, showing that the polymer fiber has good hydrophobicity (i.e. High molecular submicron fiber / nano fiber will not be destroyed by water).

Please refer to FIG. 7, which is a magnified image of a polymer fiber of a scanning electron microscope (magnification of 5000 times) of the fifth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention. In this embodiment, a polymer material containing polymethyl methacrylate and polyvinyl acetate is used to prepare high molecular nanofibers. The weight average molecular weight of polymethyl methacrylate is about 400,000 to 600,000, and the weight of polyvinyl acetate The average molecular weight is about 100,000, and the proportion of polymer material polyvinyl acetate is about 25%; the solvent used in this embodiment includes isopropyl alcohol and water, the concentration of the solvent water is about 22wt%, and the mixed solution The concentration of the polymer material is about 3wt%; the process parameters of electrospinning in this embodiment are shown in Table 9 below: Table 9 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 45% 30 ° C 0.05mL / min 6.7kV 0.42mm 12cm

As shown in the figure, the polymer fibers prepared with the concentration, ratio and process parameters of this embodiment also have a very complete fiber structure.

Please refer to FIG. 8, which is a magnified image of a polymer fiber of a scanning electron microscope (magnification of 5000 times) of the sixth embodiment of the method for preparing a hydrophobic polymer fiber by electrostatic spinning according to the present invention. In this embodiment, a polymer material containing polymethyl methacrylate and polyvinyl acetate is used to prepare high molecular nanofibers. The weight average molecular weight of polymethyl methacrylate is about 400,000 to 600,000, and the weight of polyvinyl acetate The average molecular weight is about 100,000, and the proportion of polymer material polyvinyl acetate is about 75%; the solvent used in this embodiment includes isopropyl alcohol and water, the concentration of the solvent water is about 22wt%, and the mixed solution The concentration of the polymer material is about 4.5wt%; the process parameters of electrospinning in this embodiment are shown in Table 10 below: Table 10 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 45% 30 ° C 0.05mL / min 5.5kV 0.42mm 12cm

As shown in the figure, the polymer fibers prepared with the concentration, ratio and process parameters of this embodiment also have a very complete fiber structure.

Please refer to FIG. 9, which is a magnified image of a polymer fiber of a scanning electron microscope (magnification of 5000 times) of the seventh embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention. In this embodiment, a polymer material containing polymethyl methacrylate and polyvinyl acetate is used to prepare high molecular nanofibers. The weight average molecular weight of polymethyl methacrylate is about 400,000 to 600,000, and the weight of polyvinyl acetate The average molecular weight is about 100,000, and the proportion of polymer material polyvinyl acetate is about 50%; the solvent used in this embodiment includes isopropyl alcohol and water, the concentration of the solvent water is about 22wt%, and the mixed solution The concentration of the polymer material is about 4.5wt%; the process parameters of electrospinning in this embodiment are shown in Table 11 below: Table 11 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 45% 30 ° C 0.05mL / min 5kV 0.42mm 12cm

As shown in the figure, the polymer fibers prepared with the concentration, ratio and process parameters of this embodiment also have a very complete fiber structure.

Please refer to FIG. 10, which is a magnified image of a polymer fiber of a scanning electron microscope (magnification of 5000 times) of the eighth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention. In this embodiment, a polymer material containing polymethyl methacrylate and polyvinyl acetate is used to prepare nanofibers. The weight average molecular weight of polymethyl methacrylate is about 400,000 to 600,000, and the weight average molecular weight of polyvinyl acetate is About 100,000, and the proportion of polymer material polyvinyl acetate is about 50%; the solvent used in this embodiment includes isopropyl alcohol and water, the concentration of water in the solvent is about 22wt%, and the polymer of the mixed solution The concentration of the material is about 3wt%; the process parameters of electrospinning in this embodiment are shown in Table 12 below: Table 12 humidity temperature flow Voltage Inner diameter of needle The distance from the tip of the needle to the collecting plate 45% 30 ° C 0.06mL / min 8.6kV 0.42mm 12cm

As shown in the figure, the polymer fibers prepared with the concentration, ratio and process parameters of this embodiment also have a very complete fiber structure.

Please refer to FIG. 11 and FIG. 12, which is the eighth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning of the present invention. Enlarged image of polymer fiber after waterproof test (magnification is 5000 times).

Figure 11 shows the fiber structure of the polymer fiber before the waterproof test.

As shown in Figure 12, after the polymer fiber was dripped for 10 minutes, and then placed in a vacuum oven and baked at 35 ° C for three hours, the polymer fiber remained intact, showing that this example uses a polymethacrylate The polymer submicron fibers prepared from the polymer materials of ester and polyvinyl acetate can still have good hydrophobicity (that is, the polymer submicron fibers / nano fibers will not be destroyed by water).

Please refer to FIG. 13, which is an enlarged image of a polymer fiber after a fracture test of a scanning electron microscope of the ninth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning (magnification is 50) Times); In this embodiment, the polymer fibers made with the concentration, ratio and process parameters of the fourth embodiment and the polymer fibers made with the concentration, ratio and process parameters of the seventh embodiment are subjected to a break test.

As shown in the figure, the sample on the right is nanofibers prepared using the polymer material containing polymethyl methacrylate according to the fourth embodiment, and the sample on the left is using polymethacrylic acid containing the seventh embodiment Nanofibers made from polymer materials of methyl ester and polyvinyl acetate.

Place the two samples on the stage so that the two samples are bent at 90 °. The sample on the right side has obviously broken, while the sample on the left side has not broken; therefore, the combination of polymethyl methacrylate and poly Nano fiber made of polymer material of vinyl acetate does have better toughness and softness.

In summary, according to an embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning uses non-toxic water and isopropyl alcohol as solvents, so it will not cause harm to the human body and the environment. The purpose of environmental protection.

In addition, according to the embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning adopts polymer materials containing polymethyl methacrylate and special process parameters, so it can be made into hydrophobic (ie polymer The sub-micron fiber / nano fiber will not be destroyed by water). The polymer sub-micron fiber / nano fiber is not easy to deform and dissolve in water, so it can be more widely used.

In addition, according to an embodiment of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning uses polymer materials including polymethyl methacrylate and polyvinyl acetate and special process parameters, so it can be made into The polymer submicron fiber / nano fiber with good toughness and softness has better mechanical properties.

In addition, according to the embodiments of the present invention, the method of preparing hydrophobic polymer fibers by electrospinning can produce high-quality polymer submicron fibers / nano fibers through a simple process, so it can be used without significantly increasing the cost To achieve the desired effect.

It can be seen that the present invention has achieved the desired effect under the breakthrough of the previous technology, and it is not easy to think about by those who are familiar with the art. Its progress and practicality have obviously met the patent application requirements. I filed a patent application in accordance with the law, and urge your office to approve this application for a patent for invention in order to encourage creation and reach a sense of virtue.

The above is only an example, not a limitation. Any other modifications or changes made without departing from the spirit and scope of the present invention should be included in the scope of the attached patent application.

S11 ~ S15, S21 ~ S25

Figure 1 is a flow chart of the first embodiment of the method for preparing hydrophobic polymer fibers by electrospinning in the present invention.

Figure 2 is a flow chart of a second embodiment of the method for preparing hydrophobic polymer fibers by electrospinning in the present invention.

FIG. 3 is a magnified image of polymer fibers of a scanning electron microscope according to a third embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention.

FIG. 4 is an enlarged image of a polymer fiber of a scanning electron microscope according to a fourth embodiment of the method for preparing a hydrophobic polymer fiber by electrostatic spinning according to the present invention.

FIG. 5 is a magnified image of polymer fibers before the waterproof test of the scanning electron microscope of the fourth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention.

FIG. 6 is a magnified image of polymer fibers after performing a waterproof test with a scanning electron microscope of the fourth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention.

FIG. 7 is a magnified image of polymer fibers of the scanning electron microscope of the fifth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention.

FIG. 8 is a magnified image of polymer fibers of a scanning electron microscope according to a sixth embodiment of the method for preparing hydrophobic polymer fibers by electrospinning of the present invention.

FIG. 9 is an enlarged image of a polymer fiber of a scanning electron microscope according to a seventh embodiment of the method for preparing a hydrophobic polymer fiber by electrostatic spinning according to the present invention.

Fig. 10 is a magnified image of polymer fibers of a scanning electron microscope according to an eighth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention.

FIG. 11 is an enlarged image of the polymer fiber before the waterproof test of the scanning electron microscope of the eighth embodiment of the method for preparing a hydrophobic polymer fiber by electrostatic spinning according to the present invention.

FIG. 12 is a magnified image of polymer fibers after performing a waterproof test by a scanning electron microscope of the eighth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention.

Figure 13 is a magnified image of polymer fibers after a fracture test by a scanning electron microscope of the ninth embodiment of the method for preparing hydrophobic polymer fibers by electrostatic spinning according to the present invention.

Claims (12)

A method for preparing hydrophobic polymer fibers by electrostatic spinning includes: providing a polymer material including polymethyl methacrylate; providing a solvent including isopropyl alcohol and 10-40 wt% Water; adding the polymer material to a solvent to form a mixed solution; heating and stirring the mixed solution; and electrospinning the mixed solution to produce a polymer submicron fiber or a polymer nanofiber, wherein The temperature of the mixed solution for electrospinning is 25 ~ 40 ° C, the flow rate is 0.02 ~ 0.1mL / min, and the voltage is 5.5 ~ 9.5kV. As described in item 1 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, wherein the weight average molecular weight of the polymethyl methacrylate is 200,000 to 800,000. As described in item 1 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, wherein the concentration of the polymer material in the mixed solution is 0.8 to 1.8 wt%. As described in item 1 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, in which the inner diameter of one needle of the electrospinning of the mixed solution is 0.26 to 1.0 mm. As described in item 1 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, in which the distance between the tip of one of the needles and a collection plate of the electrospinning of the mixed solution is 8-20 cm. A method for preparing hydrophobic polymer fibers by electrostatic spinning includes: providing a polymer material comprising polymethyl methacrylate and polyvinyl acetate, wherein the weight of the polymethyl methacrylate The average molecular weight is 400,000 to 600,000, and the weight average molecular weight of the polyvinyl acetate is 80,000 to 120,000, the proportion of the polyvinyl acetate of the polymer material is 25 to 75%; provide a solvent, the solvent contains different Propanol and 10-40 wt% water; adding the polymer material to a solvent to form a mixed solution; heating and stirring the mixed solution; and electrospinning the mixed solution to produce a polymer submicron fiber or a polymer Nano fiber. As described in Item 6 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, wherein the concentration of the polymer material in the mixed solution is 0.8 to 15 wt%. As described in Item 6 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, in which the temperature of electrospinning the mixed solution is 20 to 75 ° C. As described in Item 6 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, wherein the flow rate of electrospinning the mixed solution is 0.005 to 0.5 mL / min. As described in item 6 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, wherein the voltage of electrospinning the mixed solution is 2.0 to 30 kV. As described in Item 6 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, in which the inner diameter of one of the needles for electrospinning the mixed solution is 0.26 to 1.0 mm. As described in Item 6 of the patent application scope, a method for preparing hydrophobic polymer fibers by electrospinning, in which the distance between the tip of one of the needles and a collection plate is 8 to 20 cm by electrospinning the mixed solution.