CN-122008602-A - Preparation method of flexible corrugated surface

Abstract

A method for preparing a flexible corrugated surface. The method comprises the steps of mixing a PDMS matrix and a curing agent according to a specific mass ratio to form a prepolymer, removing bubbles, heating and curing to obtain a flexible PDMS substrate, applying uniaxial or biaxial stretching force to the flexible PDMS substrate to deform the flexible PDMS substrate, maintaining a stretching state, removing bubbles from the newly prepared prepolymer with the same ratio, coating the prepolymer on the substrate, heating and curing to form a double-layer flexible structure, and releasing the stretching force to enable the PDMS film to be compressed due to the deformation of the substrate so as to generate a fold structure. The invention can realize controllable adjustment of the size of the fold structure by regulating and controlling the stretching direction and amplitude, has single preparation material, simple process, low cost, short period and strong controllability, is suitable for large-scale production, solves the problems of complex preparation process, high cost and difficult mass production of the flexible fold surface in the prior art, and has wide application prospect in a plurality of fields such as flexible electronics, biomedical engineering, optical engineering and the like.

Inventors

• ZHAO YAN
• HU BAIYU
• CHEN SAINAN
• CHEN SHICHEN

Assignees

• 南京信息职业技术学院

Dates

Publication Date

20260512

Application Date

20260212

Claims (5)

1. 1. A method of making a flexible corrugated surface, comprising the steps of: step S1, uniformly mixing a PDMS matrix and a curing agent to form a prepolymer, discharging bubbles in the prepolymer, and heating and curing to obtain a flexible PDMS substrate; S2, applying a pulling force of uniaxial stretching or biaxial stretching to the flexible PDMS substrate to deform the flexible PDMS substrate in one direction or two directions; step S3, maintaining the tensile force applied to the flexible PDMS substrate, maintaining the tensile state and the tensile deformation of the flexible PDMS substrate, uniformly mixing the PDMS substrate and the curing agent to form a new prepolymer, discharging bubbles in the new prepolymer, coating the new prepolymer on the PDMS substrate in the tensile state, and heating and curing the new prepolymer to obtain a double-layer flexible structure consisting of the PDMS substrate and the PDMS film; And S4, releasing the tensile force applied to the PDMS substrate, wherein the stretching deformation of the PDMS substrate disappears, and the PDMS film on the PDMS substrate is subjected to the pressure of uniaxial compression or biaxial compression and generates a fold structure.
2. 2. The method for preparing the flexible corrugated surface according to claim 1, wherein in the step S1, the mass ratio of the PDMS matrix to the curing agent is 10:1, the heating curing temperature is 20-100 ℃, and the curing time is 0.5-24 h.
3. 3. The method of producing a flexible corrugated surface according to claim 1, wherein in step S2, the stretching width in the single direction is 5% -50%.
4. 4. The method for preparing the flexible corrugated surface according to claim 1, wherein in the step S3, the mass ratio of the PDMS matrix to the curing agent is 10:1, the heating curing temperature is 20-100 ℃, and the curing time is 0.5-24 h.
5. 5. The method of producing a flexible corrugated surface according to claim 1, wherein in step S1 and step S3, the bubbles in the prepolymer are discharged by horizontally leaving the prepolymer in a negative pressure atmosphere for 0.5 hours.

Description

Preparation method of flexible corrugated surface Technical Field The invention relates to the technical field of flexible material preparation, in particular to a preparation method of a flexible fold surface. Background The flexible fold structure is widely applied to the preparation of products such as stretchable sensors, flexible circuits, biological tissue engineering brackets, dynamic control surfaces, optical sensors and the like due to good ductility, special surface wettability and excellent optical characteristics, and has important application values in various fields such as flexible electronic and wearable equipment manufacturing, intelligent response material manufacturing, biomedical engineering, optical engineering, environmental and energy engineering and the like. At present, the preparation of the flexible fold surface generally depends on micro-nano processing technologies such as physical chemical deposition, self-growth, etching and the like. However, the existing preparation processes have the problems of complex process, high operation difficulty, high production cost and the like, so that the flexible fold surface is difficult to realize large-scale production and manufacture, and the expansion of the application range and the development of the industry are severely limited. Therefore, developing a flexible fold surface preparation method which is fast, efficient, low in cost and suitable for large-scale production becomes a technical problem to be solved in the field. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a preparation method of a flexible fold surface, which has the advantages of simple operation, strong controllability, low cost and short period, can realize controllable preparation of fold structures with different sizes, and is suitable for mass production and manufacture. In order to achieve the above purpose, the invention adopts the following technical scheme: A method of making a flexible corrugated surface comprising the steps of: step S1, uniformly mixing a PDMS matrix and a curing agent to form a prepolymer, discharging bubbles in the prepolymer, and heating and curing to obtain a flexible PDMS substrate; S2, applying a pulling force of uniaxial stretching or biaxial stretching to the flexible PDMS substrate, and stretching the flexible PDMS substrate to enable the flexible PDMS substrate to deform in a unidirectional or bidirectional manner; Step S3, maintaining unidirectional or bidirectional tensile force applied to the flexible PDMS substrate, namely maintaining the stretching state and stretching deformation of the flexible PDMS substrate, uniformly mixing the PDMS substrate and the curing agent to form a new prepolymer, discharging bubbles in the new prepolymer, coating the new prepolymer on the stretched PDMS substrate, and heating and curing to obtain a double-layer flexible structure consisting of the PDMS substrate and the PDMS film; And S4, releasing the uniaxial or biaxial tension applied to the PDMS substrate, wherein the stretching deformation of the PDMS substrate disappears, and the PDMS film on the PDMS substrate is subjected to the pressure of uniaxial compression or biaxial compression and generates a fold structure. In the step S1, the mass ratio of the PDMS matrix and the curing agent for uniformly mixing to form the prepolymer is 10:1, the heating curing temperature is 20-100 ℃, and the curing time is 0.5-24 h. The proportion and the curing parameters can ensure that the PDMS substrate has good flexibility and structural stability, and provide a reliable basis for the subsequent stretching deformation and the formation of a double-layer structure. Further, in step S2, when a tensile force of unidirectional stretching or biaxial stretching is applied to the flexible PDMS substrate, the unidirectional stretching range is 5% -50%. By adjusting the stretching amplitude, the accurate regulation and control of the size of the final fold structure can be realized, and the requirements of different application scenes on the fold structure are met. In step S3, the mass ratio of the PDMS matrix and the curing agent for uniformly mixing to form the new prepolymer is 10:1, the heating curing temperature is 20-100 ℃, and the curing time is 0.5-24 h. The bonding stability and the property uniformity of the double-layer flexible structure can be ensured by adopting the same material proportion and similar curing parameters as those of the PDMS substrate, and the problems of structure stripping or unstable performance caused by different materials or different curing degrees are avoided. Further, in step S1 and step S3, the mode of discharging the bubbles in the prepolymer is preferably to horizontally stand the prepolymer in a negative pressure environment for a standing time of 0.5h. The method can efficiently remove bubbles in the prepolymer, avoid the influence of bubble residues on the structural inte