CN-121975265-A - Mechanical property improving method of epoxy resin based on metamaterial framework support

Abstract

The invention relates to a mechanical property improving method of epoxy resin based on metamaterial framework support, which improves the mechanical property of the epoxy resin by designing a honeycomb metamaterial framework, and specifically comprises the steps of S1 designing a framework structure, namely selecting a honeycomb shape of the honeycomb metamaterial framework, regulating and controlling geometric dimension and wall thickness parameters of the honeycomb shape, S2 preparing metamaterial framework composite resin, namely printing and curing dual-curing epoxy resin by adopting a photocuring 3D printing technology to obtain the honeycomb metamaterial framework serving as a support, pouring thermosetting epoxy resin at a gap of the honeycomb metamaterial framework, and carrying out vacuum drying after curing to obtain the metamaterial framework composite resin. The photocuring 3D printing metamaterial framework is used as a support, thermosetting epoxy resin is poured at the gaps of the framework, and the metamaterial framework realizes the stress transmission path of the directional optimization material by precisely regulating and controlling the unit cell shape, the geometric dimension, the wall thickness parameters and the like, so that the mechanical property of the epoxy composite material is improved.

Inventors

• HUANG ZHENGYONG
• CAI RU
• LI JIAN
• HE RUN
• ZHANG YINGFAN
• LI CHANGHENG
• WANG FEIPENG
• CHEN WEIGEN

Assignees

• 重庆大学

Dates

Publication Date

20260505

Application Date

20250902

Claims (10)

1. 1. The method for improving the mechanical properties of the epoxy resin based on the metamaterial framework support is characterized by improving the mechanical properties of the epoxy resin by designing a honeycomb metamaterial framework, and comprises the following specific steps of: s1, designing a framework structure, namely selecting a honeycomb shape of a honeycomb metamaterial framework, and regulating and controlling geometric dimensions and wall thickness parameters of the honeycomb shape; s2, preparing the metamaterial skeleton composite resin, namely printing and curing the dual-curing epoxy resin by adopting a photo-curing 3D printing technology to obtain a honeycomb metamaterial skeleton as a support, pouring the thermosetting epoxy resin at the gaps of the honeycomb metamaterial skeleton, and drying in vacuum after curing to obtain the metamaterial skeleton composite resin.
2. 2. The method for improving the mechanical properties of the epoxy resin based on the metamaterial framework support according to claim 1, wherein a hexagon, a quadrangle or a triangle is selected as a single cell honeycomb shape printing metamaterial framework in the step S1.
3. 3. The method for improving mechanical properties of epoxy resin based on metamaterial skeleton support according to claim 1, wherein in the step S1, the geometric dimension of the skeleton structure is designed according to the relative density; If hexagonal shape is selected as the honeycomb shape, the formula of the relative density is as follows: ; wherein: Is hexagonal unit cell relative density; is hexagonal honeycomb unit cell wall length, mm; Is hexagonal unit cell wall thickness, mm; if quadrilateral is selected as the shape of the single cell, the formula of the relative density is as follows: ; wherein: Is quadrilateral unit cell relative density; is quadrilateral honeycomb unit cell wall length, mm; is quadrilateral unit cell wall thickness, mm; If triangle is selected as the honeycomb shape, the formula of the relative density is as follows: ; wherein: is triangular honeycomb unit cell wall length, mm; Is triangle unit cell wall thickness, mm.
4. 4. The method for improving mechanical properties of an epoxy resin based on metamaterial skeleton support according to claim 2, wherein in the step S1, an in-plane length X1 and a width X2 are defined, an out-of-plane direction Y is defined, and wherein the out-of-plane direction Y is defined to be 10mm or more.
5. 5. The method for improving the mechanical properties of the epoxy resin based on the metamaterial framework support according to claim 3, wherein in the step S1, the length of a honeycomb unit cell wall is 3-5.5 mm, and the unit cell wall thickness is 0.3-0.8 mm.
6. 6. The method for improving mechanical properties of epoxy resin based on metamaterial skeleton support according to claim 4, wherein the dimension of the honeycomb metamaterial skeleton designed in the step S1 is 30mmx30mmx10mm.
7. 7. The method for improving the mechanical properties of the epoxy resin based on the metamaterial framework support according to claim 3, wherein the specific steps of the step S2 are as follows: S21, drawing a three-dimensional model of the oriented skeleton structure according to the skeleton structure designed in the step S1; S22, weighing raw materials according to a proportion, placing the raw materials in a mixing cup, uniformly stirring, pouring the raw materials into a trough, and starting photo-curing 3D printing to obtain a honeycomb metamaterial framework serving as a support; S23, pouring and filling the honeycomb metamaterial framework printed in the photo-curing 3D mode by adopting thermosetting resin, and transferring the honeycomb metamaterial framework into a vacuum drying oven for curing treatment after filling is completed to obtain the metamaterial framework composite resin.
8. 8. The method for improving the mechanical properties of the epoxy resin based on the metamaterial framework support according to claim 7, wherein the raw material in the step S22 is photo-thermal dual-curing resin, the photo-thermal dual-curing resin comprises a thermosetting resin matrix and photosensitive resin, and the mass ratio of the thermosetting resin matrix to the photosensitive resin is 3-5:1.
9. 9. The method for improving the mechanical properties of the epoxy resin based on the metamaterial framework support according to claim 7, wherein in the step S23, before casting and filling, the thermosetting resin is vacuumized in a vacuum drying oven at 60 ℃ for 15-20 minutes, after casting and filling, the epoxy resin is transferred into the vacuum drying oven for curing at 140-150 ℃ for 2-3 hours, so that the epoxy resin is completely cured, and finally, the filled metamaterial framework composite resin is cooled to room temperature.
10. 10. The method for improving mechanical properties of epoxy resin based on metamaterial skeleton support according to claim 7, wherein the specific steps of photo-curing 3D printing in step S22 are as follows: firstly, the printing platform is moved downwards to a position which is separated from the clutch film by a printing layer thickness; Then, the UV light source irradiates the printing shape of the first layer to the transparent glass according to the set exposure time and program, and at the moment, the resin in the trough is quickly solidified between the printing platform and the clutch film according to the printing shape of the first layer; Then, the printing platform moves upwards for a set distance, and the first solidified layer is separated from the clutch film in the process and is adhered to the printing platform; Then, the printing platform moves downwards to a position which is separated from the clutch film by two printing layer thicknesses, and the second layer is adhered to the first layer according to the process; and (3) circulating the above processes until printing is finished, and taking the obtained honeycomb metamaterial framework off the printing platform after printing is finished.

Description

Mechanical property improving method of epoxy resin based on metamaterial framework support Technical Field The invention belongs to the field of insulating nonmetallic materials, and particularly relates to a mechanical property improving method of epoxy resin based on metamaterial framework support. Background The epoxy resin has the characteristics of good mechanical strength, insulating property, aging resistance and the like after being crosslinked and cured, and is widely applied to the fields of power system equipment, power electronic packaging and the like. Gas-insulated Metal-enclosed switchgear (Gas-insulated Switchgear, GIS) and Gas-insulated Metal-enclosed transmission line (GIL) are enclosed high-voltage combined electrical equipment adopting compressed SF6 Gas or SF 6/N2 mixed Gas as an insulating medium, and have the advantages of small occupied area, high space utilization rate, flexible configuration, convenient maintenance, small external influence and the like, and the GIS/GIL is increasingly widely applied in an electrical power system along with the continuous increase of power requirements and the continuous increase of urban and rural construction utilization rate. The epoxy resin is used as a key GIS/GIL insulation support structure material, and the mechanical property of the epoxy resin directly influences the stability and reliability of equipment. The GIL/GIS equipment needs to bear high voltage, electric power and mechanical stress in the operation process, and the mechanical property of the epoxy resin is important to ensure the stable operation of the equipment under the complex working condition. At present, the principle of improving the mechanical properties of epoxy resin mainly comprises filling filler and reinforcing fiber-reinforced filler, namely adding high-strength and high-modulus filler particles such as nano silicon dioxide, carbon nano tubes, glass fibers, aluminum oxide and the like into an epoxy resin matrix, wherein the filler particles can effectively disperse stress and prevent crack propagation, so that the mechanical properties such as tensile strength, bending strength, impact strength, modulus and the like of the epoxy resin are improved. However, to achieve good reinforcing effect, it is necessary to ensure that the filler is uniformly dispersed in the epoxy resin and forms a good interface bond therewith, which has a certain difficulty in practical operation. Meanwhile, when the filler content is higher, although the mechanical property is improved, the processing fluidity of the epoxy resin is deteriorated, the difficulty of the molding process is increased, and other properties such as the insulating property of the epoxy resin can be possibly reduced. For example, when the nano SiO 2 content is 36%, the critical stress intensity factor (K 1 C) of the bisphenol a type epoxy resin/isophorone diamine system can be increased by 100%, and the flexural modulus is improved by 50%, but at this time, the processability, insulation performance, and the like of the material may be affected. The principle of the dimensional reinforced epoxy resin is that high-strength and high-modulus fibers, such as glass fibers, carbon fibers and the like, are added into an epoxy resin matrix, and can effectively disperse stress and prevent crack propagation, so that the mechanical properties of the epoxy resin, such as tensile strength, bending strength, impact strength, modulus and the like, are improved. For example, the glass fiber reinforced epoxy resin composite material has the characteristics of good fatigue resistance, durability, insulating property, light weight, high strength and the like, the sound insulation performance is continuously improved along with the increase of the number of layers of glass fiber cloth, the change rule accords with the sound insulation characteristic curve of a single-layer homogeneous material, the anastomosis effect moves towards low frequency, and the resonance of a damping control area is weakened. However, to achieve good reinforcing effect, it is necessary to ensure that the fibers are uniformly dispersed in the epoxy resin and form good interface bonding therewith, which has a certain difficulty in practical operation. Meanwhile, although the mechanical property is improved by adding the fiber, the brittleness of the epoxy resin matrix is possibly increased, the impact resistance is affected, the processing fluidity is possibly reduced, and the difficulty of a forming process is increased. The metamaterial is a structural functional material, and the special property of the metamaterial mainly originates from a special structure rather than the components of the material, has electromagnetic, optical, acoustic or mechanical properties which are not possessed by the natural material, such as negative dielectric constant, negative magnetic permeability, negative refractive index and the like, can be widely applied to the fields o