CN114717686A

CN114717686A - Photocuring 3D printing silicone rubber conductive elastic fiber and preparation method thereof

Info

Publication number: CN114717686A
Application number: CN202210271219.XA
Authority: CN
Inventors: 王慧甫
Original assignee: Hubei Lingzhu Three Dimensional Technology Co ltd
Current assignee: Hubei Lingzhu Three Dimensional Technology Co ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-07-08

Abstract

The invention discloses a photocuring 3D printing silicon rubber conductive elastic fiber and a preparation method thereof, wherein the conductive elastic fiber comprises a conductive silicon rubber core layer formed by 3D printing and a photocuring silicon rubber skin layer wrapped outside the conductive silicon rubber core layer. The silicon rubber conductive elastic fiber is prepared by simultaneously printing the conductive silicon rubber core layer and the photocurable silicon rubber skin layer and then performing photocuring after printing. The main materials of the conductive silicon rubber core layer and the light-curable silicon rubber skin layer are silicon rubber, and the surfaces of the conductive silicon rubber core layer and the light-curable silicon rubber skin layer are completely bonded when the conductive silicon rubber core layer and the light-curable silicon rubber skin layer are printed simultaneously, so that the internal interface of the prepared silicon rubber conductive elastic fiber is completely and tightly bonded, and the silicon rubber conductive elastic fiber material can be prepared by a 3D printing process. Meanwhile, the silicon rubber structure can also ensure that the prepared silicon rubber conductive elastic fiber has good tensile property.

Description

Photocuring 3D printing silicone rubber conductive elastic fiber and preparation method thereof

Technical Field

The invention relates to the technical field of 3D printing, in particular to a photocuring 3D printing silicone rubber conductive elastic fiber and a preparation method thereof.

Background

3D printing is also called additive manufacturing, and is a technology for building a three-dimensional model of an object by using a computer and directly forming the model. The rapid development or the birth industry of the existing industry can be promoted by the cross innovation of multiple disciplines such as biomedical engineering, material forming processing, automatic control, computer modeling, artificial intelligence and the like. Compared with the traditional forming technology, the method does not need the traditional cutter, clamp and a plurality of steps of machining procedures. The method can automatically and accurately manufacture parts with any complex shapes through program control, and shortens the development period of new products. The additive manufacturing technology is rapidly developed in recent years, and is more and more applied to the aspects of aerospace, medical treatment, education, food, manufacturing, molds, artificial intelligence and the like. The development of printing materials in 3D printing is one of three key technologies, and the bottleneck of the printing materials is the primary problem limiting the development of the field.

The main chain structure of the silicon rubber is a siloxane structure, and the silicon rubber has a stable chemical structure and a series of excellent performances of high temperature resistance, oxidation resistance, flexibility, hydrophobicity, air permeability, physiological inertia, electric insulation, good biocompatibility, no toxicity, no odor, no carcinogenesis and the like. The silicone rubber can also be filled with various functional fillers and additives. Because of these properties of silicone rubber, polymethylsiloxane has become a typical flexible polymer material in the biomedical and smart material fields.

Along with the scientific and technological progress, more and more electronic product and buffering shock attenuation product develop to flexibility, intellectuality, customization, like medical equipment, health monitoring equipment, wearable equipment etc. these products not only need electronic components's normal operating, still need the product to carry out deformation and reply along with user's demand. The existing research related to flexible electronics is mainly to embed a conductive material into an elastic material by means of a mold and perform encapsulation molding. The existing casting mould mode is to manufacture a mould firstly, the production cost is high, the process adjustment is carried out according to different requirements, the mould is required to be replaced, and the existing buffering and damping functions are difficult to meet the individual requirements of customers. The general silicone rubber has long curing time, the flowability of the silicone rubber cannot ensure the 3D printing precision, and the 3D printing of a complex structure can be completed only by a supporting material. The existing silicone rubber material can release unpleasant odor in the 3D printing process, and the effective cooperative printing with other materials is limited by the hydrophobicity and the lower surface energy of the existing silicone rubber material, so that the 3D printing of the silicone rubber material is difficult to realize.

In order to develop the application of silicone rubber 3D printing, a material suitable for 3D printing is urgently needed to be designed and developed, and the performance of the material needs to meet the requirements of certain fluidity at normal temperature, quick curing, small volume shrinkage, no need of support and easy compounding.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the silicon rubber conductive elastic fiber which has better stretching recovery capability, can conduct electricity and can be prepared by 3D printing and the preparation method thereof.

The invention discloses a photocuring 3D printing silicon rubber conductive elastic fiber which comprises a conductive silicon rubber core layer formed by 3D printing and a photocuring silicon rubber skin layer wrapped outside the conductive silicon rubber core layer.

The conductive silicone rubber core layer and the light-curable silicone rubber skin layer are printed and molded simultaneously through a 3D printing technology, the elasticity of the silicone rubber fiber is kept, and the silicone rubber fiber is endowed with conductivity, so that the conductive silicone rubber fiber can be used in the field of personalized requirements of medical materials, intelligent equipment and the like.

Further, electrically conductive silicon rubber sandwich layer is the circular shape line shape in cross-section, and its circular diameter in cross-section is 100 ~ 300um, the wall thickness of photocurable silicon rubber cortex is 200 ~ 500 um.

Further, the conductive silicone rubber core layer comprises the following components in parts by weight:

40-70 parts of liquid silicone rubber, 25-55 parts of conductive filler and 5-10 parts of plasticizer; the liquid silicone rubber is vinyl-terminated polydimethylsiloxane, and the viscosity of the vinyl-terminated polydimethylsiloxane is 10-25 Pa & S. The vinyl-terminated polydimethylsiloxane is prepared by mixing vinyl-terminated polydimethylsiloxanes with different molecular weights according to performance requirements. And the end capping is carried out on the polydimethylsiloxane by adopting the vinyl group, so that the flexibility of the polydimethylsiloxane is improved, and the flexibility of the prepared conductive silicone rubber core layer is improved. At the same time, fluidity during processing is ensured by controlling the viscosity of the vinyl-terminated polydimethylsiloxane. In the invention, the vinyl-terminated polydimethylsiloxane is a commercial product purchased from Anbia special silicone company (USA) and has the trade name of Andisil VS 10 or Andisil VS 15.

Further, the plasticizer is 1, 2-propylene glycol or 1, 3-propylene glycol. According to the invention, the plasticizer is added, so that the viscosity and the fluidity of the conductive silicone rubber core layer can be adjusted, and 3D printing and forming are facilitated.

Further, the conductive filler is one of the following: metal powder, carbon fiber, carbon nano tube or conductive carbon black, wherein the size of the conductive filler is micron-sized. The carbon nano tube has the diameter of nano level, generally below 20nm, and the length of micro level.

Further, the metal powder includes one of the following: silver powder, nickel powder, copper powder and iron powder.

In the invention, the conductive silicon rubber core layer is filled with conductive filler, and when the content of the conductive filler reaches a certain volume, a conductive network can be formed in the conductive silicon rubber core layer to form a conductive path; as the conductive filler increases, the conductive path increases and the conductivity is better. However, when the conductive filler is added excessively, the fluidity of the conductive silicone rubber core layer is deteriorated during processing, and the dispersion of the conductive filler is also deteriorated. Therefore, the content of the conductive filler is preferably 25% to 50%. According to the invention, the conductive core layer is prepared by a 3D printing technology after the conductive filler and the liquid silicone rubber are mixed.

Further, the photocurable silicone rubber skin layer comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 3-6 parts of a mercapto micromolecule cross-linking agent, 0.5-1.5 parts of a photoinitiator and 50-60 parts of a solvent. The photocurable silicone rubber skin layer prepared from the components is transparent silicone rubber, so that complete curing of the conductive silicone rubber skin layer can be realized when the photocurable silicone rubber skin layer is irradiated by ultraviolet light.

Further, the viscosity of the methyl vinyl silicone rubber is 10-25 Pa.S, and the vinyl content is preferably 0.1-0.4 mmol/g. The effective curing of the photocurable silicone rubber skin layer is realized by controlling the vinyl content in the methyl vinyl silicone rubber. When the vinyl content in the methyl vinyl silicone rubber is too low, the crosslinking degree is too low to maintain the stability during photocuring of the photocuring silicone rubber skin; when the vinyl content in the methyl vinyl silicone rubber is too high, the elasticity of the photo-cured silicone rubber skin layer after photo-curing is poor. Wherein, the methyl vinyl silicone rubber is vinyl silicone rubber for short, and is copolymerized by dimethyl siloxane and a small amount of vinyl siloxane.

According to the invention, the applied methyl vinyl silicone rubber is prepared by mixing methyl vinyl silicone rubbers with different molecular weights according to performance requirements. Because the side chain of the methyl vinyl silicone rubber is connected with vinyl, the hardness of the methyl vinyl silicone rubber is improved, and the hardness of the prepared photocurable silicone rubber skin layer is further improved.

In the invention, the methyl vinyl silicone rubber is polysiloxane with vinyl groups on side chains at two ends, and the vinyl groups in the methyl vinyl silicone rubber and the mercapto groups in the mercapto micromolecule crosslinking agent are subjected to free radical crosslinking reaction in the process of illumination. The raw material of the light-curable silicone rubber skin layer, which is composed of the raw materials of methyl vinyl silicone rubber, a sulfydryl micromolecule cross-linking agent and the like, is subjected to illumination cross-linking after 3D printing, namely, cross-linking is carried out after a printing nozzle is pulled out, the raw material cannot flow any more after cross-linking, and the stable printing of silk threads is realized.

Further, the mercapto small molecule cross-linking agent comprises one or a mixture of more than two of the following components: trimethylolpropane tris (3-mercaptopropionate), trimethylolpropane tris (2-mercaptoacetate), 1, 4-butanedithiol, 1, 6-hexanedithiol, 1, 8-octanedithiol, 1, 9-nonanedithiol, 1, 10-decanedithiol, pentaerythritol tetrakis (3-mercaptopropionate), 2' - (1, 2-ethanediylbiaoxo) bisethanethiol or ethylene glycol dimercaptoacetate.

Further, the photoinitiator is a free radical photoinitiator, and the free radical photoinitiator comprises one or a mixture of more than two of the following: benzoin dimethyl ether, benzoin ethyl ether, benzoin butyl ether, benzoin, isopropyl ether, 2-hydroxy-2-methyl-1-phenyl ketone, diphenyl ethyl ketone, diphenyl ketone, alpha-diethoxy acetophenone, alpha-hydroxyalkyl benzophenone, 1-hydroxy-cyclohexyl-phenyl ketone. By adding the photoinitiator, the free radical crosslinking reaction of the mercapto micromolecule crosslinking agent and the methyl vinyl silicone rubber can be initiated.

The solvent comprises one of the following: tetrahydrofuran, ethyl acetate, or cyclohexane.

The invention also discloses a preparation method of the photocuring 3D printing silicone rubber conductive elastic fiber, which comprises the following steps:

step 1: mixing and milling all components of the conductive silicone rubber core layer at normal temperature until the components are uniform to obtain liquid conductive silicone rubber, and conveying the liquid conductive silicone rubber to a first extruder after vacuum exhaust; the first extruder is connected with an inner core joint of the 3D printing nozzle through a guide pipe;

step 2: adding a photoinitiator into the methyl vinyl silicone rubber, stirring to dissolve the photoinitiator, adding a sulfydryl micromolecule crosslinking agent and a solvent, uniformly mixing to obtain a photocuring silicone rubber mixture, and conveying the photocuring silicone rubber mixture to a second extruder after vacuum exhaust; the second extruder is connected with an outer cavity of the 3D printing nozzle through a guide pipe;

and step 3: the first extruder extrudes liquid conductive silicon rubber to an inner core of the 3D printing nozzle at an injection flow rate of 3-5uL/s, the second extruder extrudes a light-cured silicon rubber mixture to an outer cavity of the 3D printing nozzle at an injection flow rate of 9-15uL/s, the 3D printing nozzle performs coaxial printing on feed liquid in the inner core and the outer cavity at a printing rate of 7-12mm/s to obtain silicon rubber conductive elastic fibers taking the conductive silicon rubber as a core layer and light-curable silicon rubber as a skin layer, and the silicon rubber conductive elastic fibers are cured at a printing port under ultraviolet light.

The liquid conductive silicone rubber prepared in the step 1 and the light-cured silicone rubber mixture prepared in the step 2 have equivalent liquidity, and can be simultaneously printed into silicone rubber conductive elastic fibers in a 3D mode, and the silicone rubber conductive elastic fibers have good stretching recovery capacity and conductive performance; can be directly used as a flexible lead.

The invention has the beneficial effects that:

the conductive elastic silicon rubber fiber is prepared by simultaneously printing the conductive silicon rubber core layer and the photocurable silicon rubber skin layer and then carrying out photocuring after printing. The main materials of the conductive silicone rubber core layer and the photocurable silicone rubber skin layer are silicone rubber, and the surfaces of the conductive silicone rubber core layer and the photocurable silicone rubber skin layer are completely bonded when the conductive silicone rubber core layer and the photocurable silicone rubber skin layer are printed simultaneously, so that the internal interface of the prepared silicone rubber conductive elastic fiber is completely and tightly bonded, and the silicone rubber conductive elastic fiber material can be prepared by a 3D printing process. Meanwhile, the silicon rubber structure can also ensure that the prepared silicon rubber conductive elastic fiber has good tensile property.

The silicon rubber conductive elastic fiber can keep good conductivity before and after stretching. The silicone rubber conductive elastic fiber is simple in manufacturing process, can be produced in a large scale without interruption, is low in labor cost and time cost, and can meet the requirements of different users on flexible conductive fibers. The silicon rubber conductive elastic fiber can be used in the fields of biomedicine, artificial intelligence and the like, has wide application prospect, and can be stretched, compressed or twisted to change resistance so as to detect the movement of a human body.

In a word, the silicon rubber conductive elastic fiber has good compression and self-recovery capability, can have the buffer and shock absorption effects and the conductivity, has a simple preparation process, and can be used in the fields of biological medicine, flexible electronics and the like.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in detail with reference to the embodiments.

Example 1

The preparation method of the photocuring 3D printing silicone rubber conductive elastic fiber comprises the following steps:

step 1: mixing and milling the components of the conductive silicone rubber core layer at normal temperature for 5min to be uniform to obtain liquid conductive silicone rubber, and conveying the liquid conductive silicone rubber to a first extruder after vacuum exhaust; the first extruder is connected with an inner core joint of the 3D printing nozzle through a guide pipe;

the conductive silicone rubber core layer comprises the following components in parts by weight:

40 parts of liquid silicone rubber, 55 parts of conductive filler micron-sized silver powder and 5 parts of plasticizer 1, 3-propylene glycol; the liquid silicone rubber is vinyl-terminated polydimethylsiloxane, and the viscosity is 20Pa & S;

the light-cured silicone rubber mixture comprises the following components in parts by weight:

100 parts of methyl vinyl silicone rubber, 3.5 parts of a mercapto micromolecule cross-linking agent trimethylolpropane tris (3-mercaptopropionate), 1.0 part of photoinitiator benzoin dimethyl ether and 52 parts of solvent tetrahydrofuran; the viscosity of the methyl vinyl silicone rubber is 14 Pa.S, and the vinyl content is 0.2 mmol/g;

and step 3: the first extruder extrudes liquid conductive silicon rubber to an inner core of a 3D printing nozzle at an injection flow rate of 5uL/s, the second extruder extrudes a light-cured silicon rubber mixture to an outer cavity of the 3D printing nozzle at an injection flow rate of 15uL/s, the inner core joint inner diameter of the 3D printing nozzle is 200um, the inner diameter of the outer cavity structure is 400um, the 3D printing nozzle performs coaxial line printing on feed liquid in the inner core and the outer cavity at a printing rate of 7mm/s to obtain silicon rubber conductive elastic fibers taking the conductive silicon rubber as a core layer and light-curable silicon rubber as a skin layer, and the silicon rubber conductive elastic fibers are cured in 3s at a printing port under ultraviolet light.

Example 2

65 parts of liquid silicone rubber, 30 parts of conductive filler micron-sized carbon fibers and 5 parts of plasticizer 1, 2-propylene glycol; the liquid silicone rubber is vinyl-terminated polydimethylsiloxane, and the viscosity is 25 Pa.S;

100 parts of methyl vinyl silicone rubber, 4 parts of mercapto micromolecule cross-linking agent 1, 10-decanedithiol, 1.2 parts of photoinitiator diphenylethanone and 55 parts of solvent tetrahydrofuran; the viscosity of the methyl vinyl silicone rubber is 10 Pa.S, and the vinyl content is 0.1 mmol/g;

and step 3: the first extruder extrudes liquid conductive silicon rubber to an inner core of a 3D printing nozzle at an injection flow rate of 3uL/s, the second extruder extrudes a light-cured silicon rubber mixture to an outer cavity of the 3D printing nozzle at an injection flow rate of 9uL/s, the inner core joint inner diameter of the 3D printing nozzle is 100 microns, the inner diameter of the outer cavity structure is 200 microns, the 3D printing nozzle performs coaxial line printing on feed liquid in the inner core and the outer cavity at a printing rate of 12mm/s to obtain silicon rubber conductive elastic fibers taking the conductive silicon rubber as a core layer and light-curable silicon rubber as a skin layer, and the silicon rubber conductive elastic fibers are cured in 2s at a printing port under ultraviolet light.

Example 3

50 parts of liquid silicone rubber, 40 parts of micron-sized conductive carbon black serving as a conductive filler and 10 parts of 1, 2-propylene glycol serving as a plasticizer; the liquid silicone rubber is vinyl-terminated polydimethylsiloxane, and the viscosity is 10 Pa.S;

100 parts of methyl vinyl silicone rubber, 3 parts of mercapto micromolecule cross-linking agent 1, 4-butanedithiol, 1.5 parts of photoinitiator benzoin butyl ether and 50 parts of solvent ethyl acetate; the viscosity of the methyl vinyl silicone rubber is 25Pa, and the vinyl content is 0.4 mmol/g;

and step 3: the first extruder extrudes liquid conductive silicon rubber to an inner core of a 3D printing nozzle at an injection flow rate of 5uL/s, the second extruder extrudes a light-cured silicon rubber mixture to an outer cavity of the 3D printing nozzle at an injection flow rate of 15uL/s, the inner core joint inner diameter of the 3D printing nozzle is 300um, the inner diameter of the outer cavity structure is 500um, the 3D printing nozzle performs coaxial line printing on feed liquid in the inner core and the outer cavity at a printing rate of 7mm/s to obtain silicon rubber conductive elastic fibers taking the conductive silicon rubber as a core layer and light-curable silicon rubber as a skin layer, and the silicon rubber conductive elastic fibers are cured in 4s at a printing port under ultraviolet light.

Example 4

70 parts of liquid silicone rubber, 25 parts of micron-sized copper powder serving as a conductive filler and 5 parts of 1, 3-propylene glycol serving as a plasticizer; the liquid silicone rubber is vinyl-terminated polydimethylsiloxane, and the viscosity is 15 Pa.S;

100 parts of methyl vinyl silicone rubber, 6 parts of mercapto micromolecule cross-linking agent ethylene glycol dimercaptoacetate, 0.5 part of photoinitiator alpha-hydroxyalkyl benzophenone and 60 parts of solvent cyclohexane; the viscosity of the methyl vinyl silicone rubber is 20Pa, and the vinyl content is 0.3 mmol/g;

and step 3: the first extruder extrudes liquid conductive silicon rubber to an inner core of a 3D printing nozzle at an injection flow rate of 4uL/s, the second extruder extrudes a light-cured silicon rubber mixture to an outer cavity of the 3D printing nozzle at an injection flow rate of 11uL/s, the inner core joint inner diameter of the 3D printing nozzle is 200um, the inner diameter of the outer cavity structure is 400um, the 3D printing nozzle performs coaxial line printing on feed liquid in the inner core and the outer cavity at a printing rate of 7mm/s to obtain silicon rubber conductive elastic fibers taking the conductive silicon rubber as a core layer and light-curable silicon rubber as a skin layer, and the silicon rubber conductive elastic fibers are cured in 3.5s at a printing port under ultraviolet light.

The electrical resistivity, tensile strength, elongation at break and shore a hardness of the silicone rubber conductive elastic fibers prepared in examples 1 to 4 were measured, and the data obtained by the measurements are shown in table 1.

Wherein, the resistivity is detected by adopting national standard GB/T2439-2001; the tensile strength is detected by adopting national standard GB/T528-2009; the elongation at break is detected by adopting national standard GB/T528-2009; the Shore A hardness test is carried out by adopting the national standard GB/T531-1999.

TABLE 1 data for testing the properties of the conductive elastic fibers of silicone rubber prepared in examples 1-4

As can be seen from table 1, the resistivity of the silicone rubber conductive elastic fiber prepared by the preparation method of the present invention is less than 12 Ω · cm, which is proved to have conductive properties. Meanwhile, the tensile strength reaches more than 1.4MPa, and the elongation at break reaches more than 246%, which shows that the prepared silicon rubber conductive elastic fiber has good tensile recovery capability and certain strength, and can be used in the application fields requiring flexibility and elasticity.

It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.

Claims

1. The photocuring 3D printing silicon rubber conductive elastic fiber is characterized by comprising a conductive silicon rubber core layer formed by 3D printing and a photocuring silicon rubber skin layer wrapped outside the conductive silicon rubber core layer.

2. The photocuring 3D printing silicone rubber conductive elastic fiber as claimed in claim 1, wherein the conductive silicone rubber core layer is in the shape of a linear strip with a circular cross section, the diameter of the circular cross section is 100-300 um, and the wall thickness of the photocurable silicone rubber skin layer is 200-500 um.

3. The photocuring 3D printing silicone rubber conductive elastic fiber as claimed in claim 1, wherein the conductive silicone rubber core layer comprises the following components in parts by weight:

40-70 parts of liquid silicone rubber, 25-55 parts of conductive filler and 5-10 parts of plasticizer; the liquid silicone rubber is vinyl-terminated polydimethylsiloxane, and the viscosity of the vinyl-terminated polydimethylsiloxane is 10-25 Pa & S.

4. The photo-curing 3D printing silicone rubber conductive elastic fiber according to claim 3, wherein the plasticizer is 1, 2-propylene glycol or 1, 3-propylene glycol.

5. The photo-curing 3D printing silicone rubber conductive elastic fiber according to claim 3, wherein the conductive filler is one of the following: metal powder, carbon fiber, carbon nano tube or conductive carbon black, wherein the size of the conductive filler is micron-sized.

6. The light-cured 3D printed silicone rubber conductive elastic fiber according to claim 5, wherein the metal powder comprises one of the following: silver powder, nickel powder, copper powder and iron powder.

7. The photocuring 3D printing silicone rubber conductive elastic fiber as recited in claim 1, wherein the photocurable silicone rubber layer comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 3-6 parts of a mercapto micromolecule cross-linking agent, 0.5-1.5 parts of a photoinitiator and 50-60 parts of a solvent; the viscosity of the methyl vinyl silicone rubber is 10-25 Pa.S, and the vinyl content is 0.1-0.4 mmol/g.

8. The photocuring 3D printing silicone rubber conductive elastic fiber according to claim 7, wherein the mercapto small molecule cross-linking agent comprises one or a mixture of two or more of the following: trimethylolpropane tris (3-mercaptopropionate), trimethylolpropane tris (2-mercaptoacetate), 1, 4-butanedithiol, 1, 6-hexanedithiol, 1, 8-octanedithiol, 1, 9-nonanedithiol, 1, 10-decanedithiol, pentaerythritol tetrakis (3-mercaptopropionate), 2' - (1, 2-ethanediylberoxy) bisethanethiol or ethylene glycol dimercaptoacetate.

9. The photocuring 3D printed silicone rubber conductive elastic fiber according to claim 7, wherein the photoinitiator is a free radical photoinitiator comprising one or a mixture of two or more of the following: benzoin dimethyl ether, benzoin ethyl ether, benzoin butyl ether, benzoin, isopropyl ether, 2-hydroxy-2-methyl-1-phenyl ketone, diphenylethanone, benzophenone, alpha-diethoxyacetophenone, alpha-hydroxyalkylphenone, 1-hydroxy-cyclohexyl-phenyl ketone; the solvent comprises one of the following: tetrahydrofuran, ethyl acetate, or cyclohexane.

10. The preparation method of the photocuring 3D printing silicone rubber conductive elastic fiber according to one of claims 1 to 9, characterized in that it comprises the following steps: