阅读说明：本技术 一种新型电流变液的制备方法 (Preparation method of novel electrorheological fluid ) 是由 袁建波 汪元元 于 2021-08-04 设计创作，主要内容包括：本发明提供一种新型电流变液的制备方法,其特征在于,电流变液包括如下成分：绝缘基液和悬浮于绝缘基液中的聚偏二氟乙烯-三氟乙烯共聚物(P(VDF-TrFE))包覆的酞菁铜。本发明采用铁电共聚物P(VDF-TrFE)包覆具有大共轭结构的酞菁铜并辐照交联作为电流变液的分散相,分散相密度低,分散性好、不沉性好,剪切强度高,在电场作用下粘度急剧增大由液态变为固态。(The invention provides a preparation method of novel electrorheological fluid, which is characterized in that the electrorheological fluid comprises the following components: an insulating base liquid and a copper phthalocyanine coated with a polyvinylidene fluoride-trifluoroethylene copolymer (P (VDF-TrFE)) suspended in the insulating base liquid. The invention adopts the ferroelectric copolymer P (VDF-TrFE) to coat the copper phthalocyanine with a large conjugated structure and uses the irradiation crosslinking as the disperse phase of the electrorheological fluid, the disperse phase has low density, good dispersibility, good non-settling property and high shearing strength, and the viscosity is sharply increased under the action of an electric field and is changed from a liquid state to a solid state.)

1. The preparation method of the novel electrorheological fluid is characterized in that the electrorheological fluid comprises the following components: an insulating base liquid and a copper phthalocyanine coated with a polyvinylidene fluoride-trifluoroethylene copolymer (P (VDF-TrFE)) suspended in the insulating base liquid; the preparation method comprises the following steps:

(1) adding 0.005-0.01 g/mL copper phthalocyanine powder into dimethylacetamide in which 0.02-0.06 g/mL P (VDF-TrFE) is dissolved, stirring and heating to 75-90 ℃, dropwise adding 0.01-0.03 g/mL polyvinyl alcohol aqueous solution until the mass equivalent of the polyvinyl alcohol is the same as that of the P (VDF-TrFE), allowing a precipitate to appear in the solution, filtering the precipitate, and removing excessive polyvinyl alcohol in a multi-time water system to obtain the P (VDF-TrFE) -coated copper phthalocyanine;

(2) placing P (VDF-TrFE) coated copper phthalocyanine into 50-160kGy electron beam for irradiation crosslinking;

(3) and adding 30-60 parts by mass of irradiated PVDF-coated copper phthalocyanine into 100 parts by mass of insulating base liquid, and putting the mixed liquid into a planetary ball mill for dispersing and grinding for 6-10 hours to obtain the electrorheological fluid.

2. The method for preparing a novel electrorheological fluid according to claim 1, characterized in that: the insulating base liquid comprises 50-65% of trifluoropropylmethyl cyclotrisiloxane, 0-20% of methyl hydrogen silicone oil, 20-30% of chlorinated paraffin and 5-25% of hydroxyl silicone oil.

3. An electrorheological fluid prepared by the method of any one of claims 1 to 2, which has a sharp increase in viscosity under the action of an electric field and can change from a liquid state to a solid state.

Technical Field

The invention belongs to the technical field of new materials, and particularly relates to a preparation method of novel electrorheological fluid.

Background

The electrorheological fluid as an important basic material component of the intelligent material is generally divided into two types, namely a particle dispersion system and a homogeneous system. Particle dispersion refers to a suspension of micron-sized particles of high relative permittivity and low conductivity dispersed in an insulating oil of low relative permittivity. The method is characterized in that dispersed particles form a chain structure due to the application of an electric field, and form great resistance to the flowing form of the ER liquid, so that the apparent viscosity and the shear strength of the ER liquid can be continuously increased. The electrorheological fluid made of organic matter and high polymer has the advantages of good settling property, small wear to equipment and high shearing stress, and is a potential electrorheological fluid system.

Disclosure of Invention

The invention aims to provide a preparation method of novel electrorheological fluid, which is characterized in that the electrorheological fluid comprises the following components: an insulating base liquid and a copper phthalocyanine coated with a polyvinylidene fluoride-trifluoroethylene copolymer (P (VDF-TrFE)) suspended in the insulating base liquid;

the preparation method comprises the following steps:

(1) adding 0.005-0.01 g/mL copper phthalocyanine powder into dimethylacetamide in which 0.02-0.06 g/mL P (VDF-TrFE) is dissolved, stirring and heating to 75-90 ℃, dropwise adding 0.01-0.03 g/mL polyvinyl alcohol aqueous solution until the mass equivalent of the polyvinyl alcohol is the same as that of the P (VDF-TrFE), allowing a precipitate to appear in the solution, filtering the precipitate, and removing excessive polyvinyl alcohol in a multi-time water system to obtain the P (VDF-TrFE) -coated copper phthalocyanine;

(2) placing P (VDF-TrFE) coated copper phthalocyanine into 50-160kGy electron beam for irradiation crosslinking;

(3) and adding 30-60 parts by mass of irradiated PVDF-coated copper phthalocyanine into 100 parts by mass of insulating base liquid, and putting the mixed liquid into a planetary ball mill for dispersing and grinding for 6-10 hours to obtain the electrorheological fluid.

The insulating base liquid comprises 50-65% of trifluoropropylmethyl cyclotrisiloxane, 0-20% of methyl hydrogen silicone oil, 20-30% of chlorinated paraffin and 5-25% of hydroxyl silicone oil.

The invention adopts ferroelectric copolymer P (VDF-TrFE) to coat copper phthalocyanine with large conjugated structure and uses irradiation crosslinking as the disperse phase of the electrorheological fluid, the disperse phase has low density, good dispersibility and high shearing strength, and the viscosity is sharply increased under the action of an electric field and is changed from liquid state to solid state. Compared with the traditional inorganic dispersion, the system has better dispersibility and settleability and has long-term use stability.

Detailed Description

Example 1:

(1) adding 0.005g/mL copper phthalocyanine powder into dimethylacetamide in which 0.02g/mL P (VDF-TrFE) is dissolved, stirring and heating to 75 ℃, dropwise adding 0.01g/mL polyvinyl alcohol aqueous solution until the mass equivalent of the polyvinyl alcohol is the same as that of the P (VDF-TrFE), allowing a precipitate to appear in the solution, filtering the precipitate, and removing excessive polyvinyl alcohol by multiple water systems to obtain the P (VDF-TrFE) -coated copper phthalocyanine;

(2) placing P (VDF-TrFE) coated copper phthalocyanine into 50kGy electron beam for irradiation crosslinking;

(3) prepared into an insulating base solution which is divided into 50 percent of trifluoropropylmethyl cyclotrisiloxane, 5 percent of methyl hydrogen-containing silicone oil, 20 percent of chlorinated paraffin and 25 percent of hydroxyl silicone oil

(4)30 parts by mass of irradiated PVDF-coated copper phthalocyanine is added into 100 parts by mass of insulating base liquid, and the mixed liquid is put into a planetary ball mill to be dispersed and ground for 6 hours, so that electrorheological fluid is obtained. The electrorheological fluid has good non-settling property, and does not settle obviously after being sealed for 30 days at normal temperature. Shear strength 33KPa at 3 kV.

Example 2:

(1) adding 0.01g/mL copper phthalocyanine powder into dimethylacetamide in which 0.06g/mL P (VDF-TrFE) is dissolved, stirring and heating to 90 ℃, dropwise adding 0.03g/mL polyvinyl alcohol aqueous solution until the mass equivalent of the polyvinyl alcohol is the same as that of the P (VDF-TrFE), allowing a precipitate to appear in the solution, filtering the precipitate, and removing excessive polyvinyl alcohol by multiple water systems to obtain the P (VDF-TrFE) -coated copper phthalocyanine;

(2) placing P (VDF-TrFE) coated copper phthalocyanine into 160kGy electron beam for irradiation crosslinking;

(3) prepared into an insulating base solution which is divided into 65 percent of trifluoropropylmethyl cyclotrisiloxane, 30 percent of chlorinated paraffin and 5 percent of hydroxyl silicone oil

(4)60 parts by mass of irradiated PVDF-coated copper phthalocyanine is added into 100 parts by mass of insulating base liquid, and the mixed liquid is put into a planetary ball mill for dispersion and grinding for 8 hours to obtain the electrorheological fluid. The electrorheological fluid has good non-settling property, and does not settle obviously after being sealed for 30 days at normal temperature. Shear strength 52KPa at 3 kV.

Example 3:

(1) adding 0.008g/mL copper phthalocyanine powder into dimethylacetamide in which 0.04g/mL P (VDF-TrFE) is dissolved, stirring and heating to 80 ℃, dropwise adding 0.02g/mL polyvinyl alcohol aqueous solution until the mass equivalent of the polyvinyl alcohol is the same as that of the P (VDF-TrFE), allowing a precipitate to appear in the solution, filtering the precipitate, and removing excessive polyvinyl alcohol by multiple water systems to obtain the P (VDF-TrFE) -coated copper phthalocyanine;

(2) placing P (VDF-TrFE) coated copper phthalocyanine into 100kGy electron beam for irradiation crosslinking;

(3) prepared into an insulating base solution which is divided into 50 percent of trifluoropropylmethyl cyclotrisiloxane, 5 percent of methyl hydrogen-containing silicone oil, 20 percent of chlorinated paraffin and 25 percent of hydroxyl silicone oil

(4) Adding 50 parts by mass of irradiated PVDF-coated copper phthalocyanine into 100 parts by mass of insulating base liquid, and dispersing and grinding the mixed liquid in a planetary ball mill for 10 hours to obtain the electrorheological fluid. The electrorheological fluid has good non-settling property, and does not settle obviously after being sealed for 30 days at normal temperature. Shear strength 46KPa at 3 kV.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.