阅读说明：本技术 一种用于提高纳米材料电性能的改性剂，及其制备方法 (Modifier for improving electrical property of nano material and preparation method thereof ) 是由 陆树 于 2019-11-21 设计创作，主要内容包括：本发明属于纳米材料技术领域,尤其涉及一种用于提高纳米材料电性能的改性剂,及其制备方法。本发明通过将聚苯醚和聚苯硫醚共混,以制得改性剂,再与碳纳米管交联的方式,达到纳米材料电性能有效提升的效果。本发明具有改性剂组分合理有效、制备方法简单方便,与碳纳米管交联后介电常数提升效果明显,介电损耗保持降低水平,以及不影响碳纳米管自身其它物化性能的优点。(The invention belongs to the technical field of nano materials, and particularly relates to a modifier for improving the electrical property of a nano material and a preparation method thereof. According to the invention, the effect of effectively improving the electrical property of the nano material is achieved by blending polyphenyl ether and polyphenylene sulfide to prepare the modifier and then crosslinking the modifier with the carbon nano tube. The invention has the advantages of reasonable and effective modifier components, simple and convenient preparation method, obvious effect of improving the dielectric constant after crosslinking with the carbon nano tube, reduced dielectric loss and no influence on other physical and chemical properties of the carbon nano tube.)

1. A modifier for improving the electrical properties of a nanomaterial, characterized in that: the modifier is a blend of polyphenyl ether and polyphenylene sulfide, and is crosslinked with the carbon nano tube to form an anti-seepage layer on the outer side of the carbon nano tube for improving the dielectric constant.

2. The modifier for improving the electrical property of the nanomaterial according to claim 1, wherein: the modifier also comprises an organic solvent component, a slow release component, an initiating component and an antistatic component.

3. The modifier for improving the electrical property of the nanomaterial according to claim 2, wherein: the organic solvent component is one or a mixture of any more of ether, ester and alcohol, the slow-release component is polystyrene microspheres, the initiating component is dibenzoyl peroxide, and the antistatic component is an anionic antistatic component.

4. The modifier for improving the electrical property of the nanomaterial according to claim 1, wherein: the molecular weight of the polyphenylene oxide is 420-500, and the number of the thiophenyl in the main chain of the polyphenylene sulfide molecule is 11-13.

5. The modifier for improving the electrical property of the nanomaterial according to claim 4, wherein: the polyphenyl ether is pentacyclic polyphenyl ether.

6. The modifier for improving the electrical property of the nanomaterial according to claim 1, wherein the method for crosslinking the modifier with the carbon nanotubes and forming the anti-seepage layer comprises the following steps:

s1, adding a sodium dodecyl sulfate aqueous solution into an ultrasonic reactor as an ultrasonic crosslinking base solution, setting the ultrasonic frequency to be 26-28kHz and the crosslinking temperature to be 95-165 ℃;

s2, adding the blend of polyphenyl ether and polyphenylene sulfide and carbon nano tubes into the ultrasonic reactor, increasing the ultrasonic frequency to 45-50kHz, fully reacting to obtain modified carbon nano tubes, wherein the thickness of the anti-seepage layer on the carbon nano tubes for preventing current seepage is 0.60-0.65nm,

wherein the carbon nanotubes are multi-walled carbon nanotubes.

7. The modifier for improving the electrical property of the nanomaterial according to claim 3, wherein the modifier comprises the following components by weight: 45-65 parts of polyphenyl ether, 25-40 parts of polyphenylene sulfide, 15-22 parts of ether solvent, 11-13 parts of polystyrene microspheres, 1-6 parts of dibenzoyl peroxide and 1-2 parts of anionic antistatic component.

8. A modifier for improving the electrical properties of a nanomaterial according to claim 3 or 7, wherein: the anion antistatic component is ethanol solution of sodium dodecyl sulfate or sodium dodecyl sulfate.

9. A method for preparing the modifier for improving the electrical property of the nano-material according to claim 3, which comprises the following steps in sequence:

firstly, adding organic solvent components, polyphenyl ether, polyphenylene sulfide, polystyrene microspheres and dibenzoyl peroxide into a reaction kettle, ensuring that the mixing temperature is 85-120 ℃, and the stirring and mixing speed is 150-200r/min, and mixing for 15-22 min;

secondly, introducing nitrogen protection gas into the reaction kettle while adding an anionic antistatic component, and mixing the modifier in a turbid liquid form to prepare;

thirdly, fusing for 15-25min at the stirring speed of 40-80r/min to obtain the final modifier.

10. The method for preparing the modifier for improving the electrical property of the nano-material according to claim 9, wherein the method comprises the following steps: in the third step, heating is carried out during the fusion process to remove 15-45% of the organic solvent component by weight.

Technical Field

The invention belongs to the technical field of nano materials, and particularly relates to a modifier for improving the electrical property of a nano material and a preparation method thereof.

Background

The nano material is a novel material with the size of a main composition unit in the material being nano level, and is generally used in high-end fields such as high-precision equipment, special-grade fabrics, photoelectric technology industry and the like. On the other hand, the dielectric constant of the nano material is one of important indexes for judging whether the electrical performance of one type of nano material is superior or not, the existing method for improving the dielectric performance mainly comprises two methods of external electrification and pressurization improvement and modification agent addition, but most of the existing modification agents have an unobvious effect on the improvement of the dielectric performance after addition, and influence other performances of the nano material, such as thermal conductivity, melting point and the like, so that an electrical performance modifier with a good use effect is urgently needed in the market.

Chinese patent publication No. CN 1549280a, published as 2004.11.24, discloses a method for improving electrical properties of a nanomaterial, which comprises placing the nanomaterial between two electrodes, connecting the two electrodes to each other, placing a device composed of the nanomaterial and the two electrodes in a vacuum chamber, and applying a voltage across the nanomaterial.

However, the method disclosed by the invention has the problem that the improvement effect on the electrical property is not obvious.

Disclosure of Invention

The invention aims to provide a modifier for improving the electrical property of a nano material and a preparation method thereof. The invention has the advantages of reasonable and effective modifier components, simple and convenient preparation method, obvious effect of improving the dielectric constant after crosslinking with the carbon nano tube, reduced dielectric loss and no influence on other physical and chemical properties of the carbon nano tube.

The technical scheme adopted by the invention for solving the problems is as follows: the modifier is a blend of polyphenyl ether and polyphenylene sulfide, and is crosslinked with a carbon nano tube to form an anti-seepage layer on the outer side of the carbon nano tube for improving the dielectric constant.

In the invention, after the blend of the polyphenyl ether and the polyphenylene sulfide is crosslinked outside the carbon nano tube, the seepage layer for preventing current seepage is formed, so that the dielectric constant can be obviously improved, and the electrical property can be improved.

The further preferred technical scheme is as follows: the modifier also comprises an organic solvent component, a slow release component, an initiating component and an antistatic component.

The further preferred technical scheme is as follows: the organic solvent component is one or a mixture of any more of ether, ester and alcohol, the slow-release component is polystyrene microspheres, the initiating component is dibenzoyl peroxide, and the antistatic component is an anionic antistatic component.

In the present invention, the slow-release component and the initiation component are used for the uniform blending of two host polymers, and the antistatic component is used for the electrical property-improving effect of the auxiliary modifier.

The further preferred technical scheme is as follows: the molecular weight of the polyphenylene oxide is 420-500, and the number of the thiophenyl in the main chain of the polyphenylene sulfide molecule is 11-13.

The further preferred technical scheme is as follows: the polyphenyl ether is pentacyclic polyphenyl ether.

In the present invention, if the molecular weight of the polyphenylene ether is too large, a problem of insufficient uniformity in blending with the polyphenylene sulfide is likely to occur.

The further preferable technical scheme is that the method for forming the anti-seepage layer by crosslinking the modifier and the carbon nano tube comprises the following steps:

s1, adding a sodium dodecyl sulfate aqueous solution into an ultrasonic reactor as an ultrasonic crosslinking base solution, setting the ultrasonic frequency to be 26-28kHz and the crosslinking temperature to be 95-165 ℃;

s2, adding the blend of polyphenyl ether and polyphenylene sulfide and carbon nano tubes into the ultrasonic reactor, increasing the ultrasonic frequency to 45-50kHz, fully reacting to obtain modified carbon nano tubes, wherein the thickness of the anti-seepage layer on the carbon nano tubes for preventing current seepage is 0.60-0.65nm,

wherein the carbon nanotubes are multi-walled carbon nanotubes.

In the invention, the initiator and the carbon nano tube are coated and formed on the anti-seepage layer in an ultrasonic reaction coating mode, so that the coating strength is high.

The further preferred technical scheme is as follows: the modifier comprises the following components in parts by weight: 45-65 parts of polyphenyl ether, 25-40 parts of polyphenylene sulfide, 15-22 parts of ether solvent, 11-13 parts of polystyrene microspheres, 1-6 parts of dibenzoyl peroxide and 1-2 parts of anionic antistatic component.

The further preferable technical proposal is that the anion antistatic component is ethanol solution of sodium dodecyl sulfate or sodium dodecyl sulfate.

In the present invention, the reason why the antistatic component employs an anion is to avoid the occurrence of a large and harmful adhesion of the cationic or nonionic antistatic component to the polyphenylene sulfide.

A preparation method of a modifier for improving the electrical property of a nano material sequentially comprises the following steps:

firstly, adding organic solvent components, polyphenyl ether, polyphenylene sulfide, polystyrene microspheres and dibenzoyl peroxide into a reaction kettle, ensuring that the mixing temperature is 85-120 ℃, and the stirring and mixing speed is 150-200r/min, and mixing for 15-22 min;

secondly, introducing nitrogen protection gas into the reaction kettle while adding an anionic antistatic component, and mixing the modifier in a turbid liquid form to prepare;

thirdly, fusing for 15-25min at the stirring speed of 40-80r/min to obtain the final modifier.

The further preferred technical scheme is as follows: in the third step, heating is carried out during the fusion process to remove 15-45% of the organic solvent component by weight.

In the invention, each component of the modifier forms an effective blend through a heating and mixing mode, and finally excessive organic solvent components including the organic solvent components and the solvent in the anionic antistatic component are heated, so that the blending viscosity of the whole modifier is ensured to be moderate, and the crosslinking effect with the carbon nano tube is good.

According to the invention, the effect of effectively improving the electrical property of the nano material is achieved by blending polyphenyl ether and polyphenylene sulfide to prepare the modifier and then crosslinking the modifier with the carbon nano tube. The invention has the advantages of reasonable and effective modifier components, simple and convenient preparation method, obvious effect of improving the dielectric constant after crosslinking with the carbon nano tube, reduced dielectric loss and no influence on other physical and chemical properties of the carbon nano tube.

Detailed Description

The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.