Method for manufacturing piezoresistive material, piezoresistive composition and pressure sensor device
A method for manufacturing a piezoresistive material, a piezoresistive composition and a pressure sensor device are provided. The piezoresistive composition includes a conductive carbon material, a solvent, a dispersive agent, an unsaturated polyester and a crosslinking agent. The conductive carbon material is selected from a group consisting of multi-wall nanotube, single-wall carbon nanotube, carbon nanocapsule, graphene, graphite nanoflake, carbon black, and a combination thereof. The solvent is selected from a group consisting of ethyl acetate, butyl acetate, hexane, propylene glycol mono-methyl ether acetate and a combination thereof. The dispersive agent includes block polymer solution with functional groups providing the affinity. The unsaturated polyester is selected from a group consisting of an ortho-phthalic type unsaturated polyester, an iso-phthalic type unsaturated polyester, and a combination thereof. The crosslinking agent is selected from a group consisting of ethyl methyl ketone peroxide, cyclohexanone diperoxide, dibenzoyl peroxide, tert-butyl peroxybenzoate and a combination thereof.
1. A method for manufacturing a piezoresistive material, comprising:
providing a piezoresistive composition comprising:
a conductive carbon material selected from a group consisting of multi-wall carbon nanotubes, single-wall carbon nanotubes, carbon nanocapsules, graphene, graphite nanoflakes, carbon black and a combination thereof;
a solvent selected from a group consisting of ethyl acetate, butyl acetate, hexane, propylene glycol mono-methyl ether acetate and a combination thereof;
a dispersive agent comprising an affinity functional groups containing block polymer solution;
an unsaturated polyester selected from a group consisting of ortho-phthalic type unsaturated polyester, iso-phthalic type unsaturated polyester and a combination thereof; and
a crosslinking agent selected from a group consisting of ethyl methyl ketone peroxide, cyclohexanone diperoxide, dibenzoyl peroxide, tert-butyl peroxybenzoate and a combination thereof,
wherein the conductive carbon material has an amount of 0.1-40 parts by weight relative to 100 parts by a total weight of the unsaturated polyester and the conductive carbon material, the dispersive agent has an amount of 50-70 parts by weight relative to 100 parts by the weight of the conductive carbon material, the crosslinking agent has an amount of 0.1-5 parts by weight relative to 100 parts by the weight of the unsaturated polyester, the solvent has an amount of 10-40 parts by weight relative to 100 parts by the weight of the unsaturated polyester and the solvent; and
curing the piezoresistive composition for forming a piezoresistive material.
2. The method for manufacturing the piezoresistive material according to claim 1 , wherein the piezoresistive composition has a thickness of 0.1 mm˜5 mm.
3. The method for manufacturing the piezoresistive material according to claim 1 , wherein the piezoresistive composition further comprises an accelerating agent, the accelerating agent has an amount of 0.1-5 parts by weight relative to 100 parts by the weight of the unsaturated polyester.
4. The method for manufacturing the piezoresistive material according to claim 3 , wherein the accelerating agent comprises a cobalt based-accelerating agent.
5. The method for manufacturing the piezoresistive material according to claim 1 , a method for curing the piezoresistive composition comprises a moisture-initiated crosslinking method, a thermal-initiated crosslinking method, or an UV-initiated crosslinking method.
6. The method for manufacturing the piezoresistive material according to claim 1 , a method for curing the piezoresistive composition comprises disposing the piezoresistive composition in an environment of 15° C.˜35° C. for 5 mins-24 hours and then backing the piezoresistive composition by 80° C.˜130° C. for forming the piezoresistive material.
7. A pressure sensor device, comprising:
a first plate having a first conductive structure on a surface of which;
a second plate having a second conductive structure on a surface of which; and
a piezoresistive material electrically connected between the first conductive structure and the second conductive structure, wherein the piezoresistive material is manufactured by the method according to one of claims 1 - 6 .
8. A piezoresistive composition, comprising:
a conductive carbon material selected from a group consisting of multi-wall carbon nanotubes, single-wall carbon nanotubes, carbon nanocapsules, graphene, graphite nanoflakes, carbon black and a combination thereof;
a solvent selected from a group consisting of ethyl acetate, butyl acetate, hexane, propylene glycol mono-methyl ether acetate and a combination thereof;
a dispersive agent comprising an affinity functional groups containing block polymer solution;
an unsaturated polyester selected from a group consisting of ortho-phthalic type unsaturated polyester, iso-phthalic type unsaturated polyester and a combination thereof; and
a crosslinking agent selected from a group consisting of ethyl methyl ketone peroxide, cyclohexanone diperoxide, dibenzoyl peroxide, tert-butyl peroxybenzoate and a combination thereof,
wherein the conductive carbon material has an amount of 0.1-40 parts by weight relative to 100 parts by a total weight of the unsaturated polyester and the conductive carbon material, the dispersive agent has an amount of 50-70 parts by weight relative to 100 parts by the weight of the conductive carbon material, the crosslinking agent has an amount of 0.1-5 parts by weight relative to 100 parts by the weight of the unsaturated polyester, the solvent has an amount of 10-40 parts by weight relative to 100 parts by the weight of the unsaturated polyester and the solvent.
9. The piezoresistive composition according to claim 8 , further comprising an accelerating agent.
10. The piezoresistive composition according to claim 9 , wherein the accelerating agent has an amount of 0.1-5 parts by weight relative to 100 parts by the weight of the unsaturated polyester.