Electroconductive rubber film and preparation method thereof

Abstract

The invention relates to an electroconductive rubber film and a preparation method thereof and belongs to the field of electronic packaging engineering. The elastic electroconductive rubber film excellent in performance can be prepared from composite materials containing liquid silicone rubber, electroconductive filler and a diluent by means of spray coating, spin coating and the like. The electroconductive rubber film with micron-grade thickness is good in liquidity and adjustable in viscosity.

Description

technical field

[0001] The invention relates to an elastic conductive film and a preparation method thereof. In particular, it involves the dilution of conductive composite materials and the technology of coating conductive composite materials on the surface of a substrate. The conductive film is used as a flexible conductive material and belongs to the field of electronic packaging engineering. Background technique

[0002] Conductive composite materials mainly refer to composite conductive polymer materials, which are composed of polymers and conductive substances through a certain composite method. Conductive rubber is a kind of conductive composite material, which is widely used in liquid crystal display (LCD), light emitting diode (LED), integrated circuit (IC) chip, printed circuit board assembly (PCBA), membrane switch and other fields. Its advantages are mainly manifested in the following aspects.

[0003] 1. Rubber is liquid at room temperature, and can be vulcani...

Examples

preparation example Construction

[0038] The preparation method of conductive rubber film of the present invention comprises the following steps:

[0039] A. The ingredients are mixed according to the weight ratio.

[0040] B. Stir fully to fully mix the conductive filler and silicone rubber to avoid agglomeration of the conductive filler.

[0041] C. Dilute the viscosity of the conductive rubber to a suitable viscosity with a diluent.

[0042] D. Fully stir and mix to obtain a mixed liquid with good fluidity.

[0043] E. Preparation of liquid coating.

[0044] F, vulcanization.

Embodiment 1

[0046] The conductive composite material is RTV (60wt%) and nickel carbonyl (30wt%), diluted by adding 10wt% acetone, and the viscosity is 20Pa·s. Use a spray gun for spraying, the nozzle diameter is 1mm, the air pressure is 0.5MPa, the spraying distance is 5cm, and the spraying time is 20s. After curing at room temperature for 24 hours, the thickness of the conductive film is 100 μm. The resistivity is 3×10 3 Ω·m. The conductive film is foldable and has an elongation of 30%.

Embodiment 2

[0048] The conductive composite material is RTV (40wt%) and nickel carbonyl (40wt%), diluted with 20wt% acetone, and the viscosity is 15Pa·s. The film was prepared by spin coating method, the spin speed was 1000r / min, and the spin coating time was 20s. After curing at room temperature for 24 hours, the coating thickness is 100 μm. The resistivity is 2×10 2 Ω·m. The conductive film is foldable and has an elongation of 35%.

technical field

[0001] The invention relates to an elastic conductive film and a preparation method thereof. In particular, it involves the dilution of conductive composite materials and the technology of coating conductive composite materials on the surface of a substrate. The conductive film is used as a flexible conductive material and belongs to the field of electronic packaging engineering. Background technique

[0002] Conductive composite materials mainly refer to composite conductive polymer materials, which are composed of polymers and conductive substances through a certain composite method. Conductive rubber is a kind of conductive composite material, which is widely used in liquid crystal display (LCD), light emitting diode (LED), integrated circuit (IC) chip, printed circuit board assembly (PCBA), membrane switch and other fields. Its advantages are mainly manifested in the following aspects.

[0003] 1. Rubber is liquid at room temperature, and can be vulcani...

Examples

preparation example Construction

[0038] The preparation method of conductive rubber film of the present invention comprises the following steps:

[0039] A. The ingredients are mixed according to the weight ratio.

[0040] B. Stir fully to fully mix the conductive filler and silicone rubber to avoid agglomeration of the conductive filler.

[0041] C. Dilute the viscosity of the conductive rubber to a suitable viscosity with a diluent.

[0042] D. Fully stir and mix to obtain a mixed liquid with good fluidity.

[0043] E. Preparation of liquid coating.

[0044] F, vulcanization.

Embodiment 1

[0046] The conductive composite material is RTV (60wt%) and nickel carbonyl (30wt%), diluted by adding 10wt% acetone, and the viscosity is 20Pa·s. Use a spray gun for spraying, the nozzle diameter is 1mm, the air pressure is 0.5MPa, the spraying distance is 5cm, and the spraying time is 20s. After curing at room temperature for 24 hours, the thickness of the conductive film is 100 μm. The resistivity is 3×10 3 Ω·m. The conductive film is foldable and has an elongation of 30%.

Embodiment 2

[0048] The conductive composite material is RTV (40wt%) and nickel carbonyl (40wt%), diluted with 20wt% acetone, and the viscosity is 15Pa·s. The film was prepared by spin coating method, the spin speed was 1000r / min, and the spin coating time was 20s. After curing at room temperature for 24 hours, the coating thickness is 100 μm. The resistivity is 2×10 2 Ω·m. The conductive film is foldable and has an elongation of 35%.