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Low-loss LCP material and preparation method thereof

A low-loss, carbon nanotube technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of high dielectric constant itself, affecting the porosity of porous materials, catalyst and impurity residues, etc., to reduce the dielectric constant and The effect of dielectric loss

Active Publication Date: 2021-10-19
NINGXIA QINGYAN POLYMER MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter whether it is homemade or commercially available, there are different degrees of catalyst and impurity residues in the inorganic filler, which will greatly affect the porosity of the porous material, and will also cause its own dielectric constant to be high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] One embodiment of the present invention provides a method for preparing a low-loss LCP material, comprising the following steps:

[0037] (1) Soak the multi-walled carbon nanotubes in 25% hydrofluoric acid for 12 hours to remove the catalyst carrier in the filler preparation process; then soak them in 30% nitric acid solution for 24 hours to remove the filler The catalyst particles remaining in the preparation process were washed with deionized water until neutral, and dried in an oven at 110° C. for 4 hours to obtain pretreated carbon nanotubes.

[0038] (2) Mix sulfuric acid with a mass fraction of 95%, nitric acid with a mass fraction of 65%, and water in a volume ratio of 4:3:3 to obtain a mixed acid solution. Mix 1 g of pretreated carbon nanotubes with 40 mL of mixed acid solution, heat to boil, reflux for 1 h, wash with deionized water until neutral, and dry in an oven at 110 ° C for 12 h to obtain purified carbon nanotubes.

[0039] (3) Ultrasound and stir 0.1g ...

Embodiment 2

[0043] One embodiment of the present invention provides a method for preparing a low-loss LCP material, comprising the following steps:

[0044] (1) Soak the multi-walled carbon nanotubes in 35% hydrofluoric acid for 18 hours to remove the catalyst carrier in the filler preparation process; then soak them in 40% nitric acid solution for 36 hours to remove the filler The catalyst particles remaining in the preparation process were washed with deionized water until neutral, and dried in an oven at 100° C. for 6 hours to obtain pretreated carbon nanotubes.

[0045] (2) Mix sulfuric acid with a mass fraction of 95%, nitric acid with a mass fraction of 65%, and water in a volume ratio of 4:3:3 to obtain a mixed acid solution. Mix 1 g of pretreated carbon nanotubes with 40 mL of mixed acid solution, heat to boil, reflux for 0.5 h, wash with deionized water until neutral, and dry in an oven at 100 ° C for 12 h to obtain purified carbon nanotubes.

[0046](3) Ultrasound and stir 0.1g...

Embodiment 3

[0050] One embodiment of the present invention provides a method for preparing a low-loss LCP material, comprising the following steps:

[0051] (1) Soak the multi-walled carbon nanotubes in 35% hydrofluoric acid for 18 hours to remove the catalyst carrier in the filler preparation process; then soak them in 40% nitric acid solution for 36 hours to remove the filler The catalyst particles remaining in the preparation process were washed with deionized water until neutral, and dried in an oven at 130° C. for 3 hours to obtain pretreated carbon nanotubes.

[0052] (2) Mix sulfuric acid with a mass fraction of 95%, nitric acid with a mass fraction of 65%, and water in a volume ratio of 1:3:6 to obtain a mixed acid solution. Mix 1 g of pretreated carbon nanotubes with 60 mL of mixed acid solution, heat to boil, reflux for 1 h, wash with deionized water until neutral, and dry in an oven at 110 ° C for 12 h to obtain purified carbon nanotubes.

[0053] (3) Ultrasound and stir 0.1g ...

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Abstract

The invention discloses a low-loss LCP material and a preparation method thereof, and the preparation method comprises the following steps: (1) sequentially soaking a carbon nanotube in a hydrofluoric acid solution and a nitric acid solution to obtain a pretreated carbon nanotube; (2) refluxing the pretreated carbon nanotubes and mixed acid liquor to obtain purified carbon nanotubes; (3) ultrasonically stirring and mixing the purified carbon nanotubes, o-methylhydroquinone and 1, 2-dichloroethane, adding triethylamine into an ice-water bath, and stirring to obtain a mixed solution; and (4) adding 4, 4-diphenyl ether dicarboxylic acid into the mixed solution in a protective atmosphere, sequentially stirring in an ice-water bath and at room temperature, adding acetone, and filtering to obtain the low-loss LCP material. According to the method, the multiwalled carbon nanotubes are purified before being compounded, so that impurities in the filler and amorphous carbon structures in the carbon nanotubes are effectively removed. And then the purified multiwalled carbon nanotubes are compounded in the LCP synthesis process, so that the dielectric constant and dielectric loss of the LCP material are effectively reduced.

Description

technical field [0001] The invention relates to the technical field of liquid crystal polymers, in particular to a low-loss LCP material and a preparation method thereof. Background technique [0002] Liquid crystal polymers (LCPs) are thermoplastics with unique structural and physical properties. When the process flows in a liquid crystal state, the rigid parts of the molecules align one after the other along the direction of the shear flow. Once this orientation is established, the orientation and structure of the molecules will not change even when the LCP is cooled below the melting temperature. Due to the unique structure of LCP, it possesses comprehensive properties in electrical, thermal, mechanical and chemical aspects, which are not possessed by other engineering polymers. Due to the good performance and stability of LCP, it is often used as the substrate of space and military electronic systems. For example, LCP can be used as a high-performance carrier for radi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C08K3/04C09K19/38
CPCC08G63/672C08G63/78C08K3/041C09K19/3809C08K2201/011C08G2250/00
Inventor 张东宝于冉徐良
Owner NINGXIA QINGYAN POLYMER MATERIALS CO LTD