A preparation method of a palm oil-based ion-conductive elastomer

Abstract

The present invention provides a preparation method of a palm oil-based ion-conductive elastomer, belonging to the field of bio-based elastomers. Using palm oil fatty acid acrylamide ethyl ester as the raw material and a novel green deep eutectic solvent as the reactive solvent, after blending the two, a palm oil-based ion-conductive elastomer is prepared by photocuring 3D printing technology under the action of a photoinitiator; on the basis of this system, a small amount of graphene oxide is added, and a graphene oxide-reinforced palm oil-based ion-conductive elastomer is prepared by 3D printing technology. The palm oil-based ion-conductive elastomer prepared by the present invention has a very high elongation at break and excellent toughness, good conductivity, high printing accuracy, and broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of bio-based elastomers, and in particular to a palm oil-based ion-conductive elastomer and a preparation method thereof. Background Art

[0002] Stereolithography 3D printing is a high-speed additive manufacturing technology that can crosslink photosensitive resins into thermosetting or thermoplastic materials under the irradiation of ultraviolet lamps, with the advantages of high precision and high efficiency. However, at present, the "inks" for stereolithography 3D printing are mainly petroleum-based materials, which greatly limits their competitiveness in the market. Therefore, it has become a trend in recent years to use biomass resources with rich raw material sources and low prices to replace petroleum-based raw materials.

[0003] The global annual output of vegetable oil exceeds 200 million tons, which is a renewable biomass resource with broad application prospects. Among them, palm oil is the vegetable oil with the largest production, consumption, and international trade scale in the world. Using palm oil as the raw material to produce palm oil-based ion elastomers by stereolithography 3D printing reduces the use of petroleum-based products and is conducive to the development of a low-carbon economy. However, when using palm oil, it is necessary to synthesize acrylamide ethyl ester of palm oil fatty acid. However, at room temperature, the acrylamide ethyl ester of palm oil fatty acid has a high viscosity, making it difficult to react with other reagents or having a low reaction efficiency. Therefore, the number of ions generated is small, resulting in poor electrical conductivity of the printed articles, so improvement is needed. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to provide a palm oil-based ion-conductive elastomer and a preparation method thereof.

[0005] To achieve the above object, the present invention adopts the following technical solution: A preparation method of a palm oil-based ion-conductive elastomer. The raw material composition of the composite material is counted by mass fraction and includes: 4 parts of hydroxyethyl acrylate, 0.25 - 1 part of acryloyloxyethyl trimethyl ammonium chloride, 5 - 5.75 parts of acrylamide ethyl ester of palm oil fatty acid, 0.005 - 0.03 part of graphene oxide, and 0.2 part of photoinitiator.

[0006] Preferably, the molecular structural formula of the acrylamide ethyl ester of palm oil fatty acid is: Among them, R1, R2, and R3 are saturated or unsaturated fatty acids; the acrylamide ethyl ester of palm oil fatty acid is synthesized from palm oil as the raw material. The synthesis process is as follows: Put 150 g of palm oil and 150 mL of tetrahydrofuran into a three-necked flask; then add 115 g of N-hydroxyethyl acrylamide, 0.3 g of 2,6-dimethylphenol, and 5 g of sodium hydroxide; then, place the flask in an oil bath and mechanically stir (rotation speed 500 r / min) at 40 °C for 16 h; the reaction product is repeatedly purified with saturated brine 3 to 5 times, and purified by rotary evaporation to obtain the acrylamide ethyl ester of palm oil fatty acid.

[0007] Preferably, the graphene oxide is evenly dispersed in the eutectic solvent formed by mixing hydroxyethyl acrylate and acryloyloxyethyl trimethyl ammonium chloride, adjusting the resin viscosity, improving the viscosity stability of the resin, and further improving the printing accuracy. Evenly dispersed in the palm oil-based resin, it can be used as a light absorber to prevent the blockage problem caused by over-curing during 3D printing of hollow pipes. Combined with photocuring 3D printing, an ordered microstructure is constructed on the surface of the palm oil-based ion-conductive elastomer, changing the effective contact area of the sensor interface prepared based on the palm oil-based ion-conductive elastomer, so that the palm oil-based ion-conductive elastomer can be applied to flexible pressure sensors and solves the problem of low sensitivity coefficient of pressure sensors.

[0008] Preferably, the photoinitiator is phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0009] Preferably, a specific step for preparing graphene oxide-reinforced palm oil-based ion-conductive elastomer: Stir hydroxyethyl acrylate and acryloyloxyethyl trimethyl ammonium chloride at room temperature for 1 h to prepare the eutectic solvent, then evenly disperse graphene oxide into it, mechanically stir at 60 °C in ultrasonic for 1 h. After mixing evenly, add the acrylamide ethyl ester of palm oil fatty acid, continue to mechanically stir at 60 °C in ultrasonic for 3 h. After mixing evenly, pour it into the photocuring 3D printing to obtain the graphene oxide-reinforced palm oil-based ion-conductive elastomer. The ultraviolet light wavelength of the photocuring 3D printer is set at 405 nm.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The deep eutectic solvent can provide important functional groups to form multiple hydrogen bonds with palm oil monomers. The formed multiple hydrogen bond network structure promotes the reaction of the components of the palm oil-based ion conductive elastomer raw materials. The abundant hydrogen bonds in the multiple hydrogen bond network endow the elastomer with high toughness, self-healing property, self-repairing property and excellent adhesion. The deep eutectic solvent provides ions to the blend system, enabling the palm oil-based ion conductive elastomer to have excellent electrical conductivity; (2) Graphene oxide is used as a reinforcing material, and combined with 3D printing to construct a microstructure on the surface of the elastomer, so that the palm oil-based ion conductive elastomer produces a greater deformation when subjected to pressure, increasing the compression sensitivity coefficient, and can be applied to flexible pressure sensors; (3) Using bio-based palm oil as a raw material and the deep eutectic solvent as a solvent, the raw materials and preparation methods are green and environmentally friendly. Description of the Drawings

[0011] Figure 1 are the tensile stress-strain curves of five palm oil-based ion conductive elastomers: 5.25P0.75D4H, 5.5P0.5D4H, 5.75P0.25D4H, 5P1D4H and 6P4H;

[0012] Figure 2 is the tensile recovery curve of the 5.5P0.5D4H palm oil-based ion conductive elastomer;

[0013] Figure 3 are the electrical conductivities of five palm oil-based ion conductive elastomers: 5.25P0.75D4H, 5.5P0.5D4H, 5.75P0.25D4H, 5P1D4H and 5P5H;

[0014] Figure 4 are the sensitivity coefficients of four palm oil-based ion conductive elastomers: 5.25P0.75D4H, 5.5P0.5D4H, 5.75P0.25D4H and 5P1D4H;

[0015] Figure 5 is a picture of a high-precision palm oil-based ion elastomer sample;

[0016] Figure 6 are the electrical conductivities of the palm oil-based ion conductive elastomer recorded once for every 0.05% increase in the ratio from 0.05% GO to 0.3% GO;

[0017] Figure 7 is the compression loading-unloading cycle curve of 5.5P0.5D4H + 0.05% GO;

[0018] Figure 8 is the compression sensitivity coefficient of 5.5P0.5D4H + 0.05% GO with different surface microstructures under different pressures.

[0019] Figure 9 It is a picture of a high-precision graphene oxide reinforced palm oil-based ionic elastomer sample;

[0020] The meanings of the labels in the figure are as follows:

[0021] 5.75P.0.25D4H means that the mass ratio of ethyl acrylamide ethyl ester of palm oil fatty acid, acryloyloxyethyl trimethyl ammonium chloride and hydroxyethyl acrylate is 5.75:0.25:4;

[0022] 5.5P0.5D4H means that the mass ratio of ethyl acrylamide ethyl ester of palm oil fatty acid, acryloyloxyethyl trimethyl ammonium chloride and hydroxyethyl acrylate is 5.5:0.5:4;

[0023] 5.25P0.75D4H means that the mass ratio of ethyl acrylamide ethyl ester of palm oil fatty acid, acryloyloxyethyl trimethyl ammonium chloride and hydroxyethyl acrylate is 5.25:0.75:4;

[0024] 5P1D4H means that the mass ratio of ethyl acrylamide ethyl ester of palm oil fatty acid, acryloyloxyethyl trimethyl ammonium chloride and hydroxyethyl acrylate is 5:1:4;

[0025] 6P4H means that the mass ratio of ethyl acrylamide ethyl ester of palm oil fatty acid and hydroxyethyl acrylate is 6:4;

[0026] 5P5H means that the mass ratio of ethyl acrylamide ethyl ester of palm oil fatty acid and hydroxyethyl acrylate is 5:5;

[0027] GO means graphene oxide. Detailed implementation mode

[0028] To further understand the purpose, structure, characteristics and functions of the present invention, the following is a detailed description in conjunction with the embodiments.

[0029] Raw materials: Palm oil (PO) (melting point: 18°C; acid value: 0.16 mg KOH / g) was purchased from Shanghai Dingfen Chemical Technology Co., Ltd., China; N-(2-hydroxyethyl) acrylamide (>98%), 2,6-dimethylphenol (>99%), sodium chloride (≥99.5%), dichloromethane (≥99.5%), sodium hydroxide (≥96%), hydroxyethyl acrylate (96%, containing 200-600 ppm MEHQ stabilizer), acryloyloxyethyl trimethyl ammonium chloride (80 wt%, containing 300 ppm MEHQ stabilizer), phenyl bis(2,4,6-trimethylbenzoyl)-phosphine oxide (photoinitiator TPO819, >97%) were purchased from Aladdin (Shanghai) Reagent Co., Ltd.; tetrahydrofuran (≥99.5%) was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0030] Synthesis process of palm oil fatty acid acrylamide ethyl ester: Place 150 g of palm oil and 150 mL of tetrahydrofuran in a three-necked flask; then add 115 g of N-hydroxyethyl acrylamide, 0.3 g of 2,6-dimethylphenol, and 5 g of sodium hydroxide; subsequently, place the flask in an oil bath and mechanically stir (rotation speed 500 r / min) at 40 °C for 16 h; after the reaction product is repeatedly purified with saturated brine 3 - 5 times, it is purified by rotary evaporation to obtain palm oil fatty acid acrylamide ethyl ester.

[0031] Example 1

[0032] 3D printing method of palm oil-based ion conductive elastomer: Mix 12 g of hydroxyethyl acrylate and 0.75 g of acryloyloxyethyl trimethyl ammonium chloride, and magnetically stir at room temperature for 1 h to obtain a eutectic solvent; add 17.25 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator to the stirred eutectic solvent, magnetically stir at 40 °C for 1 h, mix evenly and put it into the 3D printer material tank, and perform printing under ultraviolet light irradiation with a wavelength of 405 nm. The curing time for each layer is set to 15 s.

[0033] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride, and hydroxyethyl acrylate is 5.75:0.25:4.

[0034] Example 2

[0035] 3D printing method of palm oil-based ion conductive elastomer: Mix 12 g of hydroxyethyl acrylate and 1.5 g of acryloyloxyethyl trimethyl ammonium chloride, and magnetically stir at room temperature for 1 h to obtain a eutectic solvent; add 16.5 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator to the stirred eutectic solvent, magnetically stir at 40 °C for 1 h, mix evenly and put it into the 3D printer material tank, and perform printing under ultraviolet light irradiation with a wavelength of 405 nm. The curing time for each layer is set to 15 s.

[0036] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride, and hydroxyethyl acrylate is 5.5:0.5:4.

[0037] Example 3

[0038] 3D printing method of palm oil-based ion conductive elastomer: Mix 12 g of hydroxyethyl acrylate and 2.25 g of acryloyloxyethyl trimethyl ammonium chloride, and stir magnetically at room temperature for 1 h to obtain a deep eutectic solvent; Add 15.75 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator to the stirred deep eutectic solvent, stir magnetically at 40 °C for 1 h, put it into the 3D printer material tank after mixing evenly, and perform printing under ultraviolet light irradiation with a wavelength of 405 nm. The curing time for each layer is set to 15 s.

[0039] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride and hydroxyethyl acrylate is 5.25:0.75:4.

[0040] Example 4

[0041] 3D printing method of palm oil-based ion conductive elastomer: Mix 12 g of hydroxyethyl acrylate and 3 g of acryloyloxyethyl trimethyl ammonium chloride, and stir magnetically at room temperature for 1 h to obtain a deep eutectic solvent; Add 15 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator to the stirred deep eutectic solvent, stir magnetically at 40 °C for 1 h, put it into the 3D printer material tank after mixing evenly, and perform printing under ultraviolet light irradiation with a wavelength of 405 nm. The curing time for each layer is set to 15 s.

[0042] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride and hydroxyethyl acrylate is 6:1:4.

[0043] Example 5

[0044] 3D printing method of palm oil-based ion conductive elastomer: Mix 15 g of hydroxyethyl acrylate, 15 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator, stir magnetically at 40 °C for 1 h, put it into the 3D printer material tank after mixing evenly, and perform printing under ultraviolet light irradiation with a wavelength of 405 nm. The curing time for each layer is set to 15 s.

[0045] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester and hydroxyethyl acrylate is 5:5.

[0046] Example 6

[0047] 3D printing method of palm oil-based ion conductive elastomer: Mix 12 g of hydroxyethyl acrylate, 18 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator, stir magnetically at 40 °C for 1 h, put it into the 3D printer material tank after mixing evenly, and perform printing under ultraviolet light irradiation with a wavelength of 405 nm. The curing time for each layer is set to 15 s.

[0048] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester and hydroxyethyl acrylate is 6:4.

[0049] Example 7

[0050] 3D printing method of graphene oxide reinforced palm oil-based ion conductive elastomer: Mix 12 g of 2-hydroxyethyl acrylate and 1.5 g of acryloyloxyethyl trimethyl ammonium chloride, and stir magnetically at room temperature for 1 h to obtain a deep eutectic solvent; Put 0.015 g of GO into the deep eutectic solvent, mechanically stir in an ultrasonic instrument at 60 °C for 1 h, add 16.5 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator, continue mechanical stirring for 3 h, after mixing evenly, put it into the 3D printer material tank, and carry out printing under ultraviolet light irradiation with a wavelength of 405 nm, and the curing time for each layer is set to 15 s.

[0051] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride and 2-hydroxyethyl acrylate is 5.5:0.5:4; the mass of graphene oxide accounts for 0.05% of the total mass of the resin.

[0052] Example 8

[0053] 3D printing method of graphene oxide reinforced palm oil-based ion conductive elastomer: Mix 12 g of 2-hydroxyethyl acrylate and 1.5 g of acryloyloxyethyl trimethyl ammonium chloride, and stir magnetically at room temperature for 1 h to obtain a deep eutectic solvent; Put 0.03 g of GO into the deep eutectic solvent, mechanically stir in an ultrasonic instrument at 60 °C for 1 h, add 16.5 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator, continue mechanical stirring for 3 h, after mixing evenly, put it into the 3D printer material tank, and carry out printing under ultraviolet light irradiation with a wavelength of 405 nm, and the curing time for each layer is set to 15 s.

[0054] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride and 2-hydroxyethyl acrylate is 5.5:0.5:4; the mass of graphene oxide accounts for 0.1% of the total mass of the resin.

[0055] Example 9

[0056] 3D printing method of graphene oxide reinforced palm oil-based ion conductive elastomer: Mix 12 g of 2-hydroxyethyl acrylate and 1.5 g of acryloyloxyethyl trimethyl ammonium chloride, and stir magnetically at room temperature for 1 h to obtain a deep eutectic solvent; Put 0.045 g of GO into the deep eutectic solvent, mechanically stir in an ultrasonic instrument at 60 °C for 1 h, add 16.5 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator, continue mechanical stirring for 3 h, after mixing evenly, put it into the 3D printer material tank, and carry out printing under ultraviolet light irradiation with a wavelength of 405 nm, and the curing time for each layer is set to 15 s.

[0057] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride and 2-hydroxyethyl acrylate is 5.5:0.5:4; the mass of graphene oxide accounts for 0.15% of the total mass of the resin.

[0058] Example 10

[0059] 3D printing method of graphene oxide reinforced palm oil-based ion conductive elastomer: Mix 12 g of 2-hydroxyethyl acrylate and 1.5 g of acryloyloxyethyl trimethyl ammonium chloride, and magnetically stir at room temperature for 1 h to obtain a eutectic solvent; put 0.06 g of GO into the eutectic solvent, mechanically stir in an ultrasonic instrument at 60 °C for 1 h, add 16.5 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator, continue mechanical stirring for 3 h, after mixing evenly, put it into the 3D printer material tank, and irradiate with ultraviolet light at a wavelength of 405 nm for printing, and the curing time for each layer is set to 15 s.

[0060] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride and 2-hydroxyethyl acrylate is 5.5:0.5:4; the mass of graphene oxide accounts for 0.2% of the total mass of the resin.

[0061] Example 11

[0062] 3D printing method of graphene oxide reinforced palm oil-based ion conductive elastomer: Mix 12 g of 2-hydroxyethyl acrylate and 1.5 g of acryloyloxyethyl trimethyl ammonium chloride, and magnetically stir at room temperature for 1 h to obtain a eutectic solvent; put 0.075 g of GO into the eutectic solvent, mechanically stir in an ultrasonic instrument at 60 °C for 1 h, add 16.5 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator, continue mechanical stirring for 3 h, after mixing evenly, put it into the 3D printer material tank, and irradiate with ultraviolet light at a wavelength of 405 nm for printing, and the curing time for each layer is set to 15 s.

[0063] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride and 2-hydroxyethyl acrylate is 5.5:0.5:4; the mass of graphene oxide accounts for 0.25% of the total mass of the resin.

[0064] Example 12

[0065] 3D Printing Method of Graphene Oxide Reinforced Palm Oil-based Ionic Conductive Elastomer: Mix 12 g of 2-hydroxyethyl acrylate and 1.5 g of acryloyloxyethyl trimethyl ammonium chloride, and magnetically stir for 1 h at room temperature to obtain a deep eutectic solvent; put 0.09 g of GO into the deep eutectic solvent, mechanically stir in an ultrasonic instrument at 60 °C for 1 h, add 16.5 g of palm oil fatty acid acrylamide ethyl ester and 0.6 g of photoinitiator, continue mechanical stirring for 3 h. After mixing evenly, put it into the 3D printer material tank and perform printing under ultraviolet light irradiation with a wavelength of 405 nm. The curing time for each layer is set to 15 s.

[0066] Among them, the mass ratio of palm oil fatty acid acrylamide ethyl ester, acryloyloxyethyl trimethyl ammonium chloride and 2-hydroxyethyl acrylate is 5.5:0.5:4; the mass of graphene oxide accounts for 0.3% of the total mass of the resin.

[0067] Mechanical Property Test of Palm Oil-based Ionic Conductive Elastomer:

[0068] Use a composite material and a photocuring 3D printer to print dumbbell-shaped samples (specification: length 75 mm, width 12 mm; middle length 25 mm, width 4 mm, thickness 1 mm) for tensile property testing; the tensile property testing is carried out according to the standard of GB / T 17037.2-2020. The tensile property testing is carried out on a microcomputer-controlled electronic universal testing machine at a speed of 50 mm / min.

[0069] Perform cyclic tensile experiments (loading and unloading) on the dumbbell-shaped palm oil-based ionic conductive elastomer samples at a rate of 50 mm / min at room temperature; in each cycle, the sample is pulled to a strain of 300%; there is no relaxation time between the 1st and 4th cycles; after the 4th cycle ends, the sample bar is relaxed at room temperature for 2 h and then subjected to the 5th tensile test.

[0070] Electrical Property Test of Palm Oil-based Ionic Conductive Elastomer:

[0071] Use an LCR digital bridge to test the resistance of the elastomer by the four-probe method, and calculate the conductivity according to the relationship between the conductivity and the measured resistance, area and length of the palm oil-based ionic conductive elastomer.

[0072] Use a microcomputer-controlled electronic universal testing machine to stretch the palm oil-based ionic conductive elastomer by 50%, 100%, 150% and 200% at a speed of 50 mm / min, and record the signal change with an LCR digital bridge; calculate the sensitivity coefficient according to the slope between the resistance change rate and the strain.

[0073] Using a 3D printer to print palm oil-based ion-conductive elastomers with different surface microstructures, applying different pressures of 3.27 kPa, 8.18 kPa, and 16.25 kPa on different microstructured surfaces, and using an LCR digital bridge to record their signals; calculating the sensitivity coefficient according to the slope between the resistance change rate and the pressure.

[0074] It can be seen from Figure 1 that the tensile stresses of 5.25P0.75D4H, 5.5P0.5D4H, 5.75P0.25D4H, and 5P1D4H are 0.74 MPa, 0.66 MPa, 0.72 MPa, and 0.53 MPa respectively, indicating that after adding acryloyloxyethyltrimethylammonium chloride, the tensile stress of the palm oil-based ion-conductive elastomer decreases significantly; the tensile strains are 605%, 717%, 532%, and 479% respectively, indicating that the tensile strain of the palm oil-based ion-conductive elastomer first increases and then decreases with the increase of acryloyloxyethyltrimethylammonium chloride.

[0075] It can be seen from Figure 2 that the 5.5P0.5D4H palm oil-based ion-conductive elastomer has good recoverability. The specific data are as follows: the tensile strain is 300%, and after 5 stretching cycles, the tensile stress after 2 hours of recovery is 0.34 MPa, which is 87% of the initial strength; the tensile toughness is restored to 0.27 MJ / m 3 , which is 79% of the initial toughness.

[0076] It can be seen from Figure 3 that the printed palm oil-based ion-conductive elastomer has excellent conductivity. With the increase of the content of acryloyloxyethyltrimethylammonium chloride, the conductivity of the palm oil-based ion-conductive elastomer increases, and the maximum conductivity is 6.6×10 -3 S / m.

[0077] It can be seen from Figure 4 that the sensitivity coefficients of the four printed palm oil-based ion-conductive elastomers of 5.25P0.75D4H, 5.5P0.5D4H, 5.75P0.25D4H, and 5P1D4H are all greater than 1, which can amplify the input signal and generate a larger output signal. The palm oil-based ion-conductive elastomer 5.5P0.5D4H has the largest sensitivity coefficient of 2.98.

[0078] It can be seen from Figure 5 and Figure 9 that the optical photos show that the printed palm oil-based ion-conductive elastomer has high precision, and the details of the palm oil-based ion-conductive elastomer samples are fully displayed.

[0079] It can be seen from Figure 6 that the conductivity of the printed GO / palm oil-based ion-conductive elastomer decreases with the increase of GO.

[0080] It can be seen from Figure 7 that GO has a great influence on the palm oil-based ion conductive elastomer. After adding GO, the elongation at break decreases significantly.

[0081] It can be seen from Figure 8 that introducing microstructures on the surface of the GO / palm oil-based ion conductive elastomer increases the compression sensitivity coefficient. The sensitivity coefficient of the pyramid is the largest, which is 22.93 kPa -1 , followed by the cylinder and the cube.

[0082] The present invention has been described by the above related embodiments. However, the above embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and refinements made without departing from the spirit and scope of the present invention fall within the scope of patent protection of the present invention.

Claims

1. A preparation method of a palm oil-based ion-conductive elastomer, characterized in that: Comprising a composite material, the raw material components of the composite material include: 4 parts of hydroxyethyl acrylate, 0.25 - 1 part of acryloyloxyethyl trimethyl ammonium chloride, 5 - 5.75 parts of palm oil fatty acid acrylamide ethyl ester, 0.005 - 0.03 part of graphene oxide, and 0.2 part of photoinitiator. The preparation method is as follows: hydroxyethyl acrylate and acryloyloxyethyl trimethyl ammonium chloride are stirred at room temperature to form the eutectic solvent, then graphene oxide is evenly dispersed and added, mechanically stirred under ultrasound, after mixing evenly, palm oil fatty acid acrylamide ethyl ester is added, and mechanical stirring continues under ultrasound. After mixing evenly, it is poured into a photocuring 3D printer to obtain the graphene oxide reinforced palm oil-based ionic conductive elastomer.

2. The preparation method of the palm oil-based ion conductive elastomer according to claim 1, characterized in that: The molecular structural formula of the acrylamide ethyl ester of palm oil fatty acid is as follows: Wherein R1, R2, and R3 are saturated or unsaturated fatty acids; the acrylamide ethyl ester of palm oil fatty acid is synthesized from palm oil as the raw material, and the synthesis process is as follows: Put palm oil and tetrahydrofuran in a three-necked flask; then add N-hydroxyethyl acrylamide, 2,6-dimethylphenol, and sodium hydroxide; subsequently, place the flask in an oil bath and stir mechanically for a long time; the reaction product is repeatedly purified with saturated brine and purified by rotary evaporation to obtain the acrylamide ethyl ester of palm oil fatty acid.

3. The preparation method of the palm oil-based ion conductive elastomer according to claim 1, characterized in that: The graphene oxide is evenly dispersed and sprinkled in the eutectic solvent formed by mixing hydroxyethyl acrylate and acryloyloxyethyl trimethyl ammonium chloride. Combining with photocuring 3D printing, an ordered microstructure is constructed on the surface of the palm oil-based ionic conductive elastomer, changing the effective contact area of the sensor interface prepared based on the palm oil-based ionic conductive elastomer.

4. The preparation method of the palm oil-based ion-conductive elastomer according to claim 1, characterized in that: The photoinitiator is phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

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