CN109706625B - Silicon rubber porous material array with elastic hollow fibers and preparation method thereof - Google Patents
Silicon rubber porous material array with elastic hollow fibers and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of material increase manufacturing of porous materials, and particularly relates to a silicon rubber porous material array with elastic hollow fibers and a preparation method thereof. The porous material array comprises two or more layers of hollow fiber array structures, wherein the hollow fiber array structures of the upper adjacent layer and the lower adjacent layer are mutually crossed at a certain angle, and each layer of hollow fiber array structure comprises a plurality of elastic hollow fibers arranged in parallel. The hollow fiber array structure obtained by the preparation method is used as a base material, and the formed buffering vibration reduction product or flexible electronic product has better compression and self-recovery capability, is different from the existing hollow silicon rubber manufacturing technology, solves the problems of complex process and high cost in the prior art, has the advantages of simple structure, labor and time saving and the like, avoids the traditional complicated production process of the hollow silicon rubber by using a mold or manually, and can meet different requirements of different users on 3D (three-dimensional) figures, geometric dimensions and the like.
Description
Technical Field
The invention belongs to the technical field of material increase manufacturing of porous materials, and particularly relates to a silicon rubber porous material array with elastic hollow fibers and a preparation method thereof.
Background
With the continuous progress of scientific technology, more and more flexible electronic products and buffer vibration reduction products are flexible and customized individually, such as buffer layers of wearable devices and integrated chips, and these products not only require the normal operation of electronic components, but also require that the electronic components can be elastically deformed according to the needs of users, and also require that the electronic components have better buffer vibration reduction and self-recovery functions. Related research and manufacture of the existing flexible electronics is to embed a conductive material into an elastic material in a mode of a casting mold and perform encapsulation molding. However, the related research manufacturing of the existing elastic foam has the following limitations: (1) the existing traditional casting mould mode needs to manufacture a mould in advance, the production cost is high, and if different process adjustment is carried out according to different requirements, the mould is required to be replaced according to the requirements, so that a great deal of waste of manpower, time and cost is caused; (2) the existing buffering and vibration-damping functional part has a long design period, so that the structure type or the size and the shape cannot be changed at any time according to requirements, and the increasing personalized customization requirements of users are difficult to meet.
Disclosure of Invention
The invention aims to solve the technical problem of providing a silicon rubber porous material array with elastic hollow fibers and a preparation method thereof aiming at the defects of the prior art. The invention takes the multilayer hollow fiber array structure as the base material, and the formed buffering vibration reduction product or flexible electronic product has better compression and self-recovery capability, solves the problems of complex process and high cost in the prior art, and has the advantages of simple structure, labor and time saving and the like.
In order to solve the technical problems, the invention adopts the technical scheme that: a silicon rubber porous material array with elastic hollow fibers and a preparation method thereof are characterized in that the porous material array and the preparation method thereof have the following characteristics:
a silicon rubber porous material array with elastic hollow fibers comprises two or more layers of hollow fiber array structures, wherein the hollow fiber array structures of adjacent layers are mutually crossed, the included angle is theta, and the theta is more than 0 and less than or equal to 90 degrees.
The hollow fiber array structure comprises a plurality of elastic hollow fibers arranged in parallel, each elastic hollow fiber comprises an elastic shell and an air layer in the shell, the air layer forms a buffering air bag array, and the elastic shell forms a buffering air bag shape-preserving shell.
A preparation method of a silicone rubber porous material array with elastic hollow fibers comprises the following steps:
s110, providing a substrate, a shell material and a sacrificial material;
s120, providing a shell material and sacrificial material extrusion method;
s130, providing a motion control method;
s140, filling the shell material and the sacrificial material into an extrusion device;
s150, setting extrusion parameters of the shell material and the sacrificial material;
s160, extruding the shell material and the sacrificial material onto a substrate according to the extrusion parameter extruding device and developing a set motion track to form two or more layers of mutually crossed grid structures;
s170, heating to 70-90 ℃, keeping for 2-3 hours, and curing to form a structure with an air layer at the center and an elastic shell at the outer wall.
The diameter of the air layer is 100-600 mu m.
The wall thickness of the shell is 200-800 mu m.
The sacrificial material is a volatile liquid material which volatilizes after being heated and cured.
The shell material is one or more of thermosetting or thermoplastic rubber, thermosetting or thermoplastic resin.
The extrusion device comprises a first extrusion mechanism, a second extrusion mechanism and a spray head structure, wherein the spray head structure comprises an inner core structure and an outer cavity structure, the outer cavity structure is arranged in an isolated mode around the inner core structure, an inlet of the inner core structure is connected with an outlet of the first extrusion mechanism, and an inlet of the outer cavity structure is connected with an outlet of the second extrusion mechanism.
The volatile liquid material is one or more of deionized water, absolute ethyl alcohol and ethyl acetate.
The first extrusion mechanism is used for containing the sacrificial material of the air layer and can extrude the sacrificial material of the air layer to the inner core structure, the second extrusion mechanism is used for containing the shell material and can extrude the shell material to the outer cavity structure, and the outlet of the inner core structure and the outlet of the outer cavity structure can simultaneously spray the shell material and the sacrificial material of the air layer to the substrate.
Compared with the prior art, the invention has the following advantages:
the hollow fiber array structure provided by the invention is provided with two or more layers of hollow fiber array structures, the hollow fiber arrays of adjacent layers are mutually crossed at a certain angle, each layer of hollow fiber array structure comprises a plurality of elastic hollow fibers arranged in parallel, each elastic hollow fiber comprises a shell and an air layer in the shell, the air layer forms a buffer air bag array, and the elastic shell forms a buffer air bag shell. The multilayer hollow fiber array structure is used as a base material, and a formed buffering vibration reduction product or a flexible electronic product has better compression and self-recovery capacity, and is different from the existing hollow silicon rubber manufacturing technology, so that the problems of complex process and high cost in the prior art are solved, the multilayer hollow fiber array structure has the advantages of simple structure, labor and time saving and the like, the traditional complicated production process of utilizing a mold or manually for hollow silicon rubber is avoided, the different requirements of different users on 3D (three-dimensional) figures, geometric dimensions and the like can be met, meanwhile, the buffering vibration reduction functional part produced by the manufacturing method has the advantages of good forming, high continuity, uninterrupted process, mass production and the like, and labor, time and production cost are saved.
Drawings
Fig. 1 is a schematic structural view of a hollow fiber array structure according to example 1 of the present invention.
Fig. 2 is a schematic structural view of a hollow fiber array structure according to example 2 of the present invention.
Fig. 3 is a front view of a hollow fiber array structure according to example 2 of the present invention.
FIG. 4 is a schematic view of the structure of the extrusion apparatus of the present invention.
Fig. 5 is a schematic diagram of path planning in a hollow fiber array structure printing process in embodiment 2 of the present invention.
FIG. 6 is a flow chart of a method of making a hollow fiber array structure according to the present invention.
Description of reference numerals: 100. a hollow fiber array structure; 110. an elastic hollow fiber; 111. an elastic housing; 112. an air layer; 1. a first extrusion mechanism; 2. a second extrusion mechanism; 3. a nozzle structure; 31. an inner core structure; 32. an outer cavity structure.
The present invention will be further described with reference to the following examples and accompanying drawings.
Detailed Description
Example 1
An array of silicone rubber porous material having elastic hollow fibers, the array of silicone rubber porous material of elastic hollow fibers comprising: 8 layers of hollow fiber array structures 100, every layer of hollow fiber array structure 100 all includes many parallel arrangement's elasticity hollow fiber 110, and the elasticity hollow fiber of adjacent two-layer hollow fiber array structure 100 intercrosses each other with 45, and every elasticity hollow fiber 110 all includes elasticity casing 111 and the air bed 112 in the casing, and air bed 112 forms the buffering gasbag array, and elasticity casing 111 forms buffering gasbag conformal shell.
A preparation method of a silicone rubber porous material array with elastic hollow fibers comprises the following steps:
(1) immersing the silicon wafer in an ethanol solution of fluorinated silane with the volume fraction of 1%, standing for 24h, taking out the silicon wafer, and airing to be used as a substrate;
(2) deionized water is filled into the first extrusion mechanism 1, and Dow Corning SE1700 silicone rubber is filled into the second extrusion mechanism 2;
(3) arranging a first extruding mechanism 1, a second extruding mechanism 2 and a spray head structure 3 in parallel, and respectively communicating the first extruding mechanism 1 and the second extruding mechanism 2 with an inner core structure 31 and an outer cavity structure 32 of the spray head structure 3 through guide pipes; the inner diameter of the inner core structure 31 of the nozzle structure 3 is 0.4mm, and the inner diameter of the outer cavity structure 32 is 1.5 mm;
(4) setting the flow rate of the injection pump of the first extrusion mechanism 1 to be 5 muL/s and the extrusion air pressure of the second extrusion mechanism 2 to be 65psi, printing the coaxial line on a printing substrate by the nozzle structure 3 at the printing speed of 6mm/s, wherein the printing paths can be stacked into a grid shape as shown in figure 5;
(5) and (3) curing and molding the grid-shaped hollow fiber array structure obtained in the step (3) by adopting a heating and thermosetting mode at 80 ℃ and keeping for 2 hours for curing, thus obtaining the hollow fiber array structure with 8 layers of 40 x 40mm in length, the center of which is an air layer and the outer wall of which is an elastic shell, as shown in the attached figures 1 and 2, wherein the outer diameter of each elastic hollow fiber is 1.4mm, and the diameter of the inner core is 0.4 mm.
The air layer diameter ranges from 400 μm.
The wall thickness of the housing is in the range of 500 μm.
The extrusion device comprises a first extrusion mechanism 1, a second extrusion mechanism 2 and a spray head structure 3, wherein the spray head structure 3 comprises an inner core structure 31 and an outer cavity structure 32, the outer cavity structure 32 is arranged around the inner core structure 31 in an isolated mode, an inlet of the inner core structure 31 is connected with an outlet of the first extrusion mechanism 1, and an inlet of the outer cavity structure 32 is connected with an outlet of the second extrusion mechanism 2.
The first extrusion mechanism 1 is used for containing the sacrificial material of the air layer and can extrude the sacrificial material of the air layer to the inner core structure 31, the second extrusion mechanism 2 is used for containing the manufacturing material of the shell and can extrude the manufacturing material of the shell to the outer cavity structure 32, and the outlet of the inner core structure 31 and the outlet of the outer cavity structure 32 simultaneously spray the manufacturing material of the shell and the sacrificial material of the air layer to the substrate.
Specifically, a first extrusion mechanism 1, a second extrusion mechanism 2 and a spray head 3 are arranged at the executing tail end of the multi-degree-of-freedom movement; filling a sacrificial material of an air layer into the first extrusion mechanism 1, and filling a manufacturing material of a shell into the second extrusion mechanism 2; the motion control technology and the extrusion system are used for controlling and working cooperatively, coaxial silicon rubber is extruded on the substrate in the motion process, self-supporting is completed by using the characteristic of high storage modulus of the shell layer manufacturing material, and meanwhile, the sacrificial material is extruded inside to obtain the hollow fiber array structure.
Example 2
An array of silicone rubber porous material having elastic hollow fibers, the array of silicone rubber porous material of elastic hollow fibers comprising: 8 layers of hollow fiber array structures 100, every layer of hollow fiber array structure 100 all includes many parallel arrangement's elasticity hollow fiber 110, and the elasticity hollow fiber of adjacent two-layer hollow fiber array structure 100 intercrosses each other with 90, and every elasticity hollow fiber 110 all includes elasticity casing 111 and the air bed 112 in the casing, and air bed 112 forms the buffering gasbag array, and elasticity casing 111 forms buffering gasbag conformal shell.
A preparation method of a silicone rubber porous material array with elastic hollow fibers comprises the following steps:
(1) immersing the silicon wafer in an ethanol solution of fluorinated silane with the volume fraction of 1%, standing for 24h, taking out the silicon wafer, and airing to be used as a substrate;
(2) deionized water is filled into the first extrusion mechanism 1, and Dow Corning SE1700 silicone rubber is filled into the second extrusion mechanism 2;
(3) arranging a first extruding mechanism 1, a second extruding mechanism 2 and a spray head structure 3 in parallel, and respectively communicating the first extruding mechanism 1 and the second extruding mechanism 2 with an inner core structure 31 and an outer cavity structure 32 of the spray head structure 3 through guide pipes; the inner diameter of the inner core structure 31 of the nozzle structure 3 is 0.4mm, and the inner diameter of the outer cavity structure 32 is 1.5 mm;
(4) setting the flow rate of the injection pump of the first extrusion mechanism 1 to be 5 muL/s and the extrusion air pressure of the second extrusion mechanism 2 to be 65psi, printing the coaxial line on a printing substrate by the nozzle structure 3 at the printing speed of 6mm/s, wherein the printing paths can be stacked into a grid shape as shown in figure 5;
(5) and (3) curing and molding the grid-shaped hollow fiber array structure obtained in the step (3) by adopting a heating and thermosetting mode at 80 ℃ and keeping for 3 hours for curing, thus obtaining the hollow fiber array structure with 8 layers of 40 x 40mm in length, the center of which is an air layer and the outer wall of which is an elastic shell, as shown in attached figures 1 and 2, wherein the outer diameter of each elastic hollow fiber is 1.4mm, and the diameter of the inner core is 0.4 mm.
The air layer diameter ranges from 400 μm.
The wall thickness of the housing is in the range of 500 μm.
The extrusion device comprises a first extrusion mechanism 1, a second extrusion mechanism 2 and a spray head structure 3, wherein the spray head structure 3 comprises an inner core structure 31 and an outer cavity structure 32, the outer cavity structure 32 is arranged around the inner core structure 31 in an isolated mode, an inlet of the inner core structure 31 is connected with an outlet of the first extrusion mechanism 1, and an inlet of the outer cavity structure 32 is connected with an outlet of the second extrusion mechanism 2.
The first extrusion mechanism 1 is used for containing the sacrificial material of the air layer and can extrude the sacrificial material of the air layer to the inner core structure 31, the second extrusion mechanism 2 is used for containing the manufacturing material of the shell and can extrude the manufacturing material of the shell to the outer cavity structure 32, and the outlet of the inner core structure 31 and the outlet of the outer cavity structure 32 simultaneously spray the manufacturing material of the shell and the sacrificial material of the air layer to the substrate.
Specifically, a first extrusion mechanism 1, a second extrusion mechanism 2 and a spray head 3 are arranged at the executing tail end of the multi-degree-of-freedom movement; filling a sacrificial material of an air layer into the first extrusion mechanism 1, and filling a manufacturing material of a shell into the second extrusion mechanism 2; the motion control technology and the extrusion system are used for controlling and working cooperatively, coaxial silicon rubber is extruded on the substrate in the motion process, self-supporting is completed by using the characteristic of high storage modulus of the shell layer manufacturing material, and meanwhile, the sacrificial material is extruded inside to obtain the hollow fiber array structure.
Aiming at the curing conditions of different materials, auxiliary curing equipment such as a thermosetting heating plate, a heating light source and the like can be selectively configured, and the coating material is heated and cured in the printing process so as to obtain a better coating effect.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the principles of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (2)
1. The silicone rubber porous material array with the elastic hollow fibers is characterized by comprising more than two layers of hollow fiber array structures (100), wherein the hollow fiber array structures (100) of adjacent layers are mutually crossed, the included angle is theta, and the theta is more than 0 and less than or equal to 90 degrees;
the hollow fiber array structure (100) comprises a plurality of elastic hollow fibers (110) which are arranged in parallel, wherein the elastic hollow fibers (110) comprise an elastic shell (111) and an air layer (112) in the shell, the air layer (112) forms a buffer air bag array, and the elastic shell (111) forms a buffer air bag conformal shell;
the preparation method of the silicone rubber porous material array with the elastic hollow fibers comprises the following steps:
s110, providing a substrate, a shell material and a sacrificial material; the sacrificial material is a volatile liquid material which is heated and solidified and then volatilizes; the shell material is silicon rubber;
s120, providing a shell material and sacrificial material extrusion method;
s130, providing a motion control method;
s140, filling the shell material and the sacrificial material into an extrusion device;
s150, setting extrusion parameters of the shell material and the sacrificial material;
s160, extruding the shell material and the sacrificial material onto a substrate according to the extrusion parameter extruding device and developing a set motion track to form more than two layers of mutually crossed grid structures; the extrusion device comprises a first extrusion mechanism (1), a second extrusion mechanism (2) and a spray head structure (3), wherein the spray head structure (3) comprises an inner core structure (31) and an outer cavity structure (32), the outer cavity structure (32) is arranged around the inner core structure (31) in an isolated mode, an inlet of the inner core structure (31) is connected with an outlet of the first extrusion mechanism (1), and an inlet of the outer cavity structure (32) is connected with an outlet of the second extrusion mechanism (2); the first extrusion mechanism (1) is used for containing the sacrificial material of the air layer and can extrude the sacrificial material of the air layer to the inner core structure (31), the second extrusion mechanism (2) is used for containing the shell material and can extrude the shell material to the outer cavity structure (32), and an outlet of the inner core structure (31) and an outlet of the outer cavity structure (32) simultaneously eject the shell material and the sacrificial material of the air layer to the substrate;
s170, heating to 70-90 ℃, keeping for 2-3 hours, and curing to form a structure with an air layer at the center and an elastic shell at the outer wall; the diameter of the air layer is 100-600 mu m; the wall thickness of the shell is 200-800 mu m.
2. The silicone rubber porous material array of claim 1, wherein the volatile liquid material is one or more of deionized water, absolute ethyl alcohol, ethyl acetate.
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