CN-122011739-A - Ion conductive elastomer, preparation method thereof and off-type pressure sensor

CN122011739ACN 122011739 ACN122011739 ACN 122011739ACN-122011739-A

Abstract

The invention relates to the technical field of flexible sensors, in particular to an ion conductive elastomer, a preparation method thereof and an off-type pressure sensor. The preparation method of the ion conductive elastomer comprises the steps of (a) mixing an alkenyl-containing ionic liquid, a solution containing an elastomer matrix, a disulfide bond-containing cross-linking agent and nano filler to obtain a precursor solution, and (b) uniformly mixing the precursor solution with an initiator, performing orientation treatment, then initiating polymerization reaction and drying to obtain the ion conductive elastomer, wherein the orientation treatment comprises the steps of applying an oriented electric field or shearing force to the uniformly mixed solution. The ion conductive elastomer prepared by the invention has the characteristics of high rebound resilience, low hysteresis and low creep, has high-efficiency and stable ion transmission capacity, self-repairing capacity and multidimensional force decoupling capacity, and has wide application prospect in the field of ionic pressure sensors.

Inventors

LI LONGWEI
CHEN LEI
QI SHENGGUANG
Liu Fengsi
Ji Wengen
WANG JIASHENG

Assignees

广州鹿山新材料股份有限公司
江苏鹿山新材料有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The preparation method of the ion conductive elastomer is characterized by comprising the following steps: (a) Mixing an alkenyl-containing ionic liquid, a solution containing an elastomer matrix, a disulfide bond-containing cross-linking agent and a nanofiller to obtain a precursor solution; The dosages of the alkenyl-containing ionic liquid, the elastomer matrix, the disulfide bond-containing cross-linking agent and the nano filler are respectively 20% -50%, 42.5% -79.4%, 0.1% -2.5% and 0.5% -5% based on 100% of the total mass of the alkenyl-containing ionic liquid, the elastomer matrix, the disulfide bond-containing cross-linking agent and the nano filler; (b) Uniformly mixing the precursor solution with an initiator, performing orientation treatment, initiating polymerization reaction, and drying to obtain an ion conductive elastomer; the orientation treatment comprises applying an oriented electric field or applying a shearing force to the uniformly mixed solution.
2. The method of manufacturing according to claim 1, characterized by at least one of the following features: (1) The elastomeric matrix comprises at least one of a thermoplastic polyurethane, an ethylene-vinyl acetate elastomer, and a styrene block copolymer; (2) In the solution containing the elastomer matrix, the mass concentration of the elastomer matrix is 5% -30%; (3) In the solution containing the elastomer matrix, the solvent comprises at least one of acetone, acetonitrile, N-dimethylformamide, N-dimethylacetamide, N-methylpyrrolidone and dimethyl sulfoxide.
3. The preparation method according to claim 1, wherein the preparation raw materials of the alkenyl-containing ionic liquid comprise an alkenyl-containing zwitterionic salt and a lithium salt; The amphoteric ion salt containing alkenyl comprises at least one of 1-carboxymethyl-3-vinyl imidazole chloride salt, 1-sulfopropyl-3-vinyl imidazole inner salt and 1- (carboxymethyl) -3-vinyl-1H-imidazolium bromide; the lithium salt includes at least one of lithium bis (trifluoromethanesulfonyl imide), lithium bis (fluorosulfonyl imide), lithium tetrafluoroborate, and lithium hexafluorophosphate.
4. The method of manufacturing according to claim 1, characterized by at least one of the following features: (1) The disulfide bond-containing crosslinking agent comprises at least one of bis (2-methacryloyl) oxyethyl disulfide and 3,3' -dithiobis (sulfosuccinimidyl propionate); (2) The nanofiller includes at least one of cellulose nanofibers, nanomolecular sieves, MXene nanoplatelets, graphene oxide nanoplatelets, nanovermiculite, and nanoclays.
5. The production method according to claim 1, wherein in the step (b), the mass of the initiator is 0.1% to 1% of the mass of the alkenyl group-containing ionic liquid in the precursor solution; The initiator includes at least one of a photoinitiator and a thermal initiator.
6. The method according to claim 1, wherein the field strength is 5 to 20v/cm and the treatment time is 10 to 30min when the directional electric field is applied.
7. The preparation method according to claim 1, wherein when the shearing force is applied, the shearing force is provided for the solution film scraping by a scraper, and the film scraping speed is 1-10 cm/s.
8. The method of claim 1, wherein the polymerization is initiated by ultraviolet light irradiation or heating; The polymerization reaction time is 1-30 min.
9. An ion conductive elastomer prepared by the preparation method of any one of claims 1 to 8.
10. An off-the-air pressure sensor comprising the ion conductive elastomer of claim 9.

Description

Ion conductive elastomer, preparation method thereof and off-type pressure sensor Technical Field The invention relates to the technical field of flexible sensors, in particular to an ion conductive elastomer, a preparation method thereof and an off-type pressure sensor. Background With the rapid development of flexible electronics, wearable devices and intelligent robots, the need for high performance flexible sensing devices capable of accurately sensing physical signals such as pressure, deformation, etc. is becoming increasingly urgent. Among the many sensor types, off-electric pressure sensors have become a research hotspot in the field due to the advantages of simple structure, high sensitivity, capability of detecting static pressure, and the like. The working mechanism of the ion conductive elastomer mainly depends on the change of an interfacial double layer caused by the microstructure change of the ion conductive elastomer which is a key sensitive material under the action of pressure. Therefore, the intrinsic properties of the ion conductive elastomer as the sensor core directly determine the core metrics of the sensor, such as sensitivity, detection limit, response speed, stability, durability, and the like. In order to meet the development requirements of high performance of the sensor, the ion conductive elastomer material needs to have high rebound resilience, low hysteresis property and low creep property. The high resilience ensures that the sensor quickly and almost completely returns to its original shape and electrical state after pressure unloading, which is the basis for achieving a fast response and high accuracy, repeated measurements. The low hysteresis reflects the low energy dissipation degree of the material in the loading and unloading cycle process, directly determines the consistency and reliability of the sensor output signal in the cycle test, and is the key for realizing high-precision measurement. The low creep deformation means that the deformation trend of the material is small along with the time growth under the constant stress, and the characteristic can ensure the stability of the reading of the sensor in the long-time static pressure measurement and avoid signal drift. Currently, the mainstream ionic conductive elastomer preparation method usually adopts a physical blending strategy, that is, an ionic liquid or salt is doped into a traditional elastomer substrate (such as silicone rubber, polyurethane and the like) to endow the material with ionic conductivity. However, the ionic liquid used as the plasticizer can obviously weaken the interaction between polymer chains while endowing the material with ionic conductivity, the substrate is excessively plasticized, the integrity of an elastomer network is damaged, the segmental motion resistance is reduced, and the macroscopic performance is that the modulus of the material is reduced, the permanent deformation is increased, the rebound resilience is seriously impaired, and obvious mechanical hysteresis and creep behavior are accompanied. The sensor prepared from the ion conductive elastomer obtained by the method is difficult to achieve both high sensitivity and excellent dynamic mechanical stability, and the problems of performance attenuation and signal distortion are easy to occur in long-term cyclic use. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide an ion conductive elastomer, a preparation method thereof and an off-type pressure sensor, wherein the ion conductive elastomer not only has high rebound, low hysteresis and low creep characteristics, but also has high-efficiency and stable ion transmission capacity and self-repairing capacity, has multidimensional force decoupling capacity, and can meet the development requirement of a high-performance sensor. The first aspect of the present invention provides a method for producing an ion-conductive elastomer, comprising the steps of: (a) Mixing an alkenyl-containing ionic liquid, a solution containing an elastomer matrix, a disulfide bond-containing cross-linking agent and a nanofiller to obtain a precursor solution; The dosages of the alkenyl-containing ionic liquid, the elastomer matrix, the disulfide bond-containing cross-linking agent and the nano filler are respectively 20% -50%, 42.5% -79.4%, 0.1% -2.5% and 0.5% -5% based on 100% of the total mass of the alkenyl-containing ionic liquid, the elastomer matrix, the disulfide bond-containing cross-linking agent and the nano filler; (b) Uniformly mixing the precursor solution with an initiator, performing orientation treatment, initiating polymerization reaction, and drying to obtain an ion conductive elastomer; the orientation treatment comprises applying an oriented electric field or applying a shearing force to the uniformly mixed solution. In a specific embodiment of the present invention, the elastomeric matrix comprises at least one of a thermopla