阅读说明：本技术 一种电容器盖板绝缘材料及其制备方法 (Capacitor cover plate insulating material and preparation method thereof ) 是由 陈树林 黄勇 尹三同 耿翠红 陈天阳 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种电容器盖板绝缘材料,包括以下重量份的原料：天然胶25-30份、丁苯胶20-25份、再生胶15-25份、润滑油5-10份、碳酸钙5-10份、聚丙烯酸酯胶乳2-5份、氧化锌1-4份、促进剂0.5-1.5份、防老剂DFC-34 0.5-1.5份、互配助剂3.5-5.5份、均散剂1-3份、硫磺1-2份、改性蛇纹岩3-6份。本发明添加的均散剂为WB212,WB212是混合在无机填料中的高分子脂肪酸酯乳化物,可用作天然橡胶和合成橡胶的分散均匀助剂,通过WB212将天然橡胶和合成橡胶均匀分散到盖板材料的原料中。(The invention discloses a capacitor cover plate insulating material which comprises the following raw materials in parts by weight: 25-30 parts of natural rubber, 20-25 parts of butadiene styrene rubber, 15-25 parts of reclaimed rubber, 5-10 parts of lubricating oil, 5-10 parts of calcium carbonate, 2-5 parts of polyacrylate latex, 1-4 parts of zinc oxide, 0.5-1.5 parts of accelerator, 3.5-5.5 parts of anti-aging agent DFC, 1-3 parts of blending auxiliary agent, 1-2 parts of sulfur and 3-6 parts of modified serpentine. The dispersant added in the invention is WB212, WB212 is a high molecular fatty acid ester emulsion mixed in an inorganic filler, and can be used as a uniform dispersing aid for natural rubber and synthetic rubber, and the natural rubber and the synthetic rubber are uniformly dispersed in the raw material of the cover plate material through WB 212.)

1. The capacitor cover plate insulating material is characterized by comprising the following raw materials in parts by weight:

25-30 parts of natural rubber, 20-25 parts of butadiene styrene rubber, 15-25 parts of reclaimed rubber, 5-10 parts of lubricating oil, 5-10 parts of calcium carbonate, 2-5 parts of polyacrylate latex, 1-4 parts of zinc oxide, 0.5-1.5 parts of accelerator, 3.5-5.5 parts of anti-aging agent DFC, 1-3 parts of blending auxiliary agent, 1-2 parts of homogenizing agent, and 3-6 parts of modified serpentine;

the preparation method of the blending auxiliary agent comprises the following steps:

(1) calcining mordenite in a muffle furnace at high temperature of 1200-1400 ℃ for 1-2h, then ball-milling until the particle size is 2-10um, and then sending the mordenite into a steam explosion machine for explosion treatment at the explosion pressure of 1-2 Mpa;

(2) performing corona treatment on the mordenite in the step (1), wherein the corona treatment power is 5-10Kw, the treatment temperature is 35-50 ℃, and the treatment time is 10-20 min;

(3) feeding the mordenite in the step (2) and a silane coupling agent KH-560 into a magnetic stirrer together for stirring at the stirring speed of 100-200r/min for 3-6h at the stirring temperature of 85-95 ℃, and after the reaction is finished, washing, filtering and centrifuging;

(4) and (3) adding the mordenite in the step (3) into triethanolamine, then sending the triethanolamine into a high-pressure reaction kettle for high-pressure treatment at 10-20MPa, then sequentially adding lauryl gallate, sorbitan sesquioleate and glycerol monolaurate, then stirring the mixture at the rotating speed of 200r/min for 35-45min, and finally centrifuging, washing and drying the mixture to obtain the blending auxiliary agent.

2. The capacitor cover plate insulating material as claimed in claim 1, wherein the capacitor cover plate insulating material comprises the following raw materials in parts by weight:

26-28 parts of natural rubber, 21-24 parts of butadiene styrene rubber, 16-24 parts of reclaimed rubber, 6-9 parts of lubricating oil, 6-9 parts of calcium carbonate, 3-4 parts of polyacrylate latex, 2-3 parts of zinc oxide, 0.8-1.2 parts of accelerator, 3.8-4.2 parts of anti-aging agent DFC-340.7-1.3 parts of blending auxiliary agent, 1.5-2.5 parts of dispersing agent, 1.3-1.7 parts of sulfur and 4.2-5.8 parts of modified serpentine.

3. The capacitor cover plate insulating material as claimed in claim 2, wherein the capacitor cover plate insulating material comprises the following raw materials in parts by weight:

27.5 parts of natural rubber, 22.5 parts of butadiene styrene rubber, 20 parts of reclaimed rubber, 7.5 parts of lubricating oil, 7.5 parts of calcium carbonate, 3.5 parts of polyacrylate latex, 2.5 parts of zinc oxide, 1 part of accelerator, 1.0 part of anti-aging agent DFC-341.0, 4 parts of blending auxiliary agent, 2 parts of dispersing agent, 1.5 parts of sulfur and 4.5 parts of modified serpentine.

4. The capacitor cover plate insulating material as claimed in claim 1, wherein the accelerant is prepared by mixing and blending D, M and DM according to a weight ratio of 1:1: 1.

5. The capacitor cover plate insulating material according to claim 1, wherein the homogenizing agent is WB 212.

6. The capacitor cover plate insulating material as claimed in claim 1, wherein the modification method of the modified serpentine comprises the steps of performing ball milling on fibrous serpentine by using a ball mill, passing through a 100-fold 200-mesh sieve after ball milling, adding the fibrous serpentine into sodium citrate, performing ultrasonic dispersion for 20-30min at an ultrasonic power of 200-fold 300W, adding dodecafluoroheptyl acrylate 2-3 times of the total amount of the serpentine, performing high-speed stirring at a rotating speed of 600-fold 800r/min for 10min, adding a buffer solution 1-2 times of the total amount of the serpentine, continuing stirring for 40-50min, and performing water washing, centrifugation and drying after the stirring is finished.

7. The capacitor cover plate insulating material according to claim 6, wherein the buffer solution is a phosphate buffer solution with a pH value of 7.2-7.8.

8. A method of producing the capacitor cover plate insulation material according to any one of claims 1 to 7, comprising the steps of:

weighing raw materials of each component according to requirements;

step two, adding natural rubber, butadiene styrene rubber and reclaimed rubber into a temperature-resistant strengthening solution for soaking for 45-55min at the temperature of 55-65 ℃, performing high-energy ray cobalt 60 radiation treatment in the soaking process, wherein the radiation dose is 200-300Gy, the radiation time is 10-20s of irradiation treatment every 5s, performing treatment for 10min, filtering the natural rubber, the butadiene styrene rubber, the reclaimed rubber and PVC after the soaking is finished, and removing the filtrate to obtain a base material A;

step three, feeding the base material A, the lubricating oil, the calcium carbonate, the polyacrylate latex, the zinc oxide, the anti-aging agent DFC-34, the blending auxiliary agent, the dispersing agent, the sulfur and the modified serpentine into a stirrer together for stirring, firstly stirring at a high speed for 20-30min, and then stirring at a low speed for 55-65min to obtain a mixed material B;

step four, feeding the mixed material B in the step three into a kneader for mixing, firstly mixing for 1-2h under the condition of 45-55 ℃, then increasing the temperature to 110-165 ℃ for further mixing for 3-5h, finally increasing the temperature to 145-75 ℃ for further mixing for 0.5-1h, and finally reducing the temperature to 65-75 ℃ for further mixing for 2h to obtain a mixed material C;

step five, uniformly mixing the material C refined in the step four with an accelerant, then carrying out vulcanization treatment for 30-40min under the conditions of 170-180 ℃ and 3-6MPa, finishing vulcanization, and cooling to room temperature to obtain the capacitor cover plate insulating material.

9. The method for producing the capacitor cover plate insulating material as claimed in claim 8, wherein the temperature-resistant reinforcing liquid in the second step is prepared by adding 25-35 parts by mass of 30-40% phosphorous acid and 10-20 parts by mass of 16-22% octadecyl trimethyl ammonium chloride solution into a reaction kettle, maintaining the pressure of the reaction kettle at 2-5MPa and the reaction temperature at 75-85 ℃, then stirring at a rotation speed of 500-600r/min for reaction for 35-45min, then adding 5-10 parts by mass of polyether polyol and 2-4 parts by mass of sodium alkyl benzene sulfonate, then reducing the rotation speed to 200-300r/min, then stirring for 60-100min, and obtaining the temperature-resistant reinforcing liquid after the reaction is finished.

10. The method as claimed in claim 8, wherein the rotation speed of the high-speed stirring in the third step is 800-1000r/min, and the rotation speed of the low-speed stirring is 150-250 r/min.

Technical Field

The invention relates to the technical field of capacitor cover plates, in particular to a capacitor cover plate insulating material and a preparation method thereof.

Background

The capacitor is formed by two electrodes and a dielectric material therebetween. The dielectric material is a dielectric medium, when placed in an electric field between two parallel plates with equal amounts of opposite charges, polarization charges are generated on the surface of the dielectric medium due to polarization, and accordingly charges bound to the plates are increased correspondingly, and the potential difference between the plates is maintained constant. The quantity of charge Q stored in this capacitor is equal to the product of the capacitance C and the potential difference U between the electrodes. The capacitance is proportional to the area of the plates and the dielectric constant epsilon of the dielectric material and inversely proportional to the thickness of the dielectric material (i.e., the distance between the plates).

The capacitor cover plate is a key accessory on the capacitor, and the capacitor is a core part inside the motor. The service life of the capacitor is affected by the heat generated by the continuous running of the motor and the influence of extreme weather. Because the capacitor cover plate is exposed outside the capacitor, the influence of extreme severe weather is the largest.

Although the existing capacitor cover plate has insulation, the material is easy to age and crack after long-term use, the insulation is rapidly reduced, and meanwhile, the weather resistance of the capacitor cover plate applied to the environment with easy temperature change cannot be guaranteed, so that the application of the insulation performance of the capacitor cover plate is further limited.

The prior Chinese patent literature publication numbers are as follows: CN109909693A discloses a method for processing capacitor aluminum cover plate material, which comprises the following steps: (1) arranging a quenching water tank of 3 meters at a position 1-1.5 meters away from an outlet of the extrusion die along the extrusion direction, and introducing cooling water; (2) feeding the hot extruded capacitor aluminum cover plate into a quenching water tank at the speed of 8-12 m/min for cooling to below 85-95 ℃; (3) clamping the cooled capacitor aluminum cover plate into a straightening device, and stretching the capacitor aluminum cover plate; (4) cutting off the edge of the extended aluminum cover plate of the capacitor, wherein the edge size is 2-4 cm; (5) after the aging treatment is finished, opening the furnace and taking out the aluminum cover plate of the capacitor, and naturally cooling the aluminum cover plate to room temperature in the air.

Chinese patent document publication No.: CN107540894A discloses an insulating rubber, which comprises the following raw materials in parts by weight: 80 parts of nitrile rubber, 100 parts of talcum powder, 1 part of stearic acid, 50 parts of calcium carbonate, MRX10 parts of mineral rubber, 1 parts of accelerator MBTS, 1 part of anti-aging agent, 3 parts of sulfur and 5 parts of zinc oxide, wherein the insulating material adopts nitrile rubber as a main base material, although the insulating material has insulating resistance, the added talcum powder, stearic acid, calcium carbonate and other raw materials are mainly conventional raw materials, the obvious performance is conventional, meanwhile, the temperature resistance cannot be guaranteed, and then the insulating material is limited to be applied to a capacitor cover plate.

Disclosure of Invention

The present invention is directed to a capacitor cover plate insulating material and a method for preparing the same, so as to solve the problems of the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

a capacitor cover plate insulating material comprises the following raw materials in parts by weight:

25-30 parts of natural rubber, 20-25 parts of butadiene styrene rubber, 15-25 parts of reclaimed rubber, 5-10 parts of lubricating oil, 5-10 parts of calcium carbonate, 2-5 parts of polyacrylate latex, 1-4 parts of zinc oxide, 0.5-1.5 parts of accelerator, 3.5-5.5 parts of anti-aging agent DFC, 1-3 parts of blending auxiliary agent, 1-2 parts of homogenizing agent, and 3-6 parts of modified serpentine;

the preparation method of the blending auxiliary agent comprises the following steps:

(1) calcining mordenite in a muffle furnace at high temperature of 1200-1400 ℃ for 1-2h, then ball-milling until the particle size is 2-10um, and then sending the mordenite into a steam explosion machine for explosion treatment at the explosion pressure of 1-2 Mpa;

(2) performing corona treatment on the mordenite in the step (1), wherein the corona treatment power is 5-10Kw, the treatment temperature is 35-50 ℃, and the treatment time is 10-20 min;

(3) feeding the mordenite in the step (2) and a silane coupling agent KH-560 into a magnetic stirrer together for stirring at the stirring speed of 100-200r/min for 3-6h at the stirring temperature of 85-95 ℃, and after the reaction is finished, washing, filtering and centrifuging;

(4) and (3) adding the mordenite in the step (3) into triethanolamine, then sending the triethanolamine into a high-pressure reaction kettle for high-pressure treatment at 10-20MPa, then sequentially adding lauryl gallate, sorbitan sesquioleate and glycerol monolaurate, then stirring the mixture at the rotating speed of 200r/min for 35-45min, and finally centrifuging, washing and drying the mixture to obtain the blending auxiliary agent.

The invention further comprises the following steps: the capacitor cover plate insulating material comprises the following raw materials in parts by weight:

26-28 parts of natural rubber, 21-24 parts of butadiene styrene rubber, 16-24 parts of reclaimed rubber, 6-9 parts of lubricating oil, 6-9 parts of calcium carbonate, 3-4 parts of polyacrylate latex, 2-3 parts of zinc oxide, 0.8-1.2 parts of accelerator, 3.8-4.2 parts of anti-aging agent DFC-340.7-1.3 parts of blending auxiliary agent, 1.5-2.5 parts of dispersing agent, 1.3-1.7 parts of sulfur and 4.2-5.8 parts of modified serpentine.

The invention further comprises the following steps: the capacitor cover plate insulating material comprises the following raw materials in parts by weight:

27.5 parts of natural rubber, 22.5 parts of butadiene styrene rubber, 20 parts of reclaimed rubber, 7.5 parts of lubricating oil, 7.5 parts of calcium carbonate, 3.5 parts of polyacrylate latex, 2.5 parts of zinc oxide, 1 part of accelerator, 1.0 part of anti-aging agent DFC-341.0, 4 parts of blending auxiliary agent, 2 parts of dispersing agent, 1.5 parts of sulfur and 4.5 parts of modified serpentine.

The invention further comprises the following steps: the accelerant is prepared by mixing and blending the accelerant D, the accelerant M and the accelerant DM according to the weight ratio of 1:1: 1.

The invention further comprises the following steps: the homogenizing agent is WB 212.

The invention further comprises the following steps: the modification method of the modified serpentine comprises the steps of firstly carrying out ball milling treatment on fibrous serpentine by adopting a ball mill, passing through a 100-minus-one 200-mesh sieve after ball milling, then firstly adding the fibrous serpentine into sodium citrate for ultrasonic dispersion for 20-30min, wherein the ultrasonic power is 200-minus-one 300W, then adding dodecafluoroheptyl acrylate accounting for 2-3 times of the total amount of the serpentine, then carrying out high-speed stirring for 10min at the rotating speed of 600-minus-one 800r/min, then adding a buffer solution accounting for 1-2 times of the total amount of the serpentine, continuing stirring for 40-50min, and after stirring, washing, centrifuging and drying the fibrous serpentine.

The invention further comprises the following steps: the buffer solution is a phosphate buffer solution with the pH value of 7.2-7.8.

The invention also provides a production method of the capacitor cover plate insulating material, which comprises the following steps:

weighing raw materials of each component according to requirements;

step two, adding natural rubber, butadiene styrene rubber and reclaimed rubber into a temperature-resistant strengthening solution for soaking for 45-55min at the temperature of 55-65 ℃, performing high-energy ray cobalt 60 radiation treatment in the soaking process, wherein the radiation dose is 200-300Gy, the radiation time is 10-20s of irradiation treatment every 5s, performing treatment for 10min, filtering the natural rubber, the butadiene styrene rubber, the reclaimed rubber and PVC after the soaking is finished, and removing the filtrate to obtain a base material A;

step three, feeding the base material A, the lubricating oil, the calcium carbonate, the polyacrylate latex, the zinc oxide, the anti-aging agent DFC-34, the blending auxiliary agent, the dispersing agent, the sulfur and the modified serpentine into a stirrer together for stirring, firstly stirring at a high speed for 20-30min, and then stirring at a low speed for 55-65min to obtain a mixed material B;

step four, feeding the mixed material B in the step three into a kneader for mixing, firstly mixing for 1-2h under the condition of 45-55 ℃, then increasing the temperature to 110-165 ℃ for further mixing for 3-5h, finally increasing the temperature to 145-75 ℃ for further mixing for 0.5-1h, and finally reducing the temperature to 65-75 ℃ for further mixing for 2h to obtain a mixed material C;

step five, uniformly mixing the material C refined in the step four with an accelerant, then carrying out vulcanization treatment for 30-40min under the conditions of 170-180 ℃ and 3-6MPa, finishing vulcanization, and cooling to room temperature to obtain the capacitor cover plate insulating material.

The invention further comprises the following steps: and the preparation method of the temperature-resistant reinforcing liquid in the second step comprises the steps of adding 25-35 parts by mass of 30-40% phosphorous acid and 10-20 parts by mass of 16-22% octadecyl trimethyl ammonium chloride solution into a reaction kettle, keeping the pressure of the reaction kettle at 2-5MPa and the reaction temperature at 75-85 ℃, stirring and reacting at the rotating speed of 500-600r/min for 35-45min, then adding 5-10 parts by mass of polyether polyol and 2-4 parts by mass of sodium alkyl benzene sulfonate, reducing the rotating speed to 200-300r/min, stirring for 60-100min, and obtaining the temperature-resistant reinforcing liquid after the reaction is finished.

The invention further comprises the following steps: the rotating speed of the high-speed stirring in the third step is 800-1000r/min, and the rotating speed of the low-speed stirring is 150-250 r/min.

Compared with the prior art, the invention has the following beneficial effects:

(1) the added homogenizing agent is WB212, the WB212 is a high molecular fatty acid ester emulsion mixed in an inorganic filler and can be used as a uniform dispersing auxiliary agent for natural rubber and synthetic rubber, the natural rubber and the synthetic rubber are uniformly dispersed into the raw materials of the cover plate material through the WB212, the natural rubber, styrene butadiene rubber and reclaimed rubber are added into a temperature-resistant reinforcing liquid for soaking and irradiation treatment, so that the working stability of the base material under temperature resistance is improved, the accelerant is prepared by mixing and blending D, M and DM according to the weight ratio of 1:1:1, so that the raw materials are promoted to be converted into a three-dimensional network structure, the vulcanization effect of the cover plate material is improved, the base material, calcium carbonate, the blending auxiliary agent and the serpentine added in the vulcanization period jointly act to form the three-dimensional network structure, the calcium carbonate is used as the filler, so that the compactness among the raw materials can be enhanced, the porosity of the rubber material is reduced, but the modified rubber material is flexible and dispersible in the rubber material, and the fibrous structure of the modified rubber material can penetrate into the gaps of the rubber material, so that the compactness of the material is enhanced, the gap structure of the rubber is greatly filled and compensated, and the weather resistance of the rubber is greatly improved by cooperating with calcium carbonate.

(2) The preparation of the blending aid adopts mordenite as a raw material, the mordenite is fibrous and fibrillar, the mordenite is subjected to high-temperature calcination treatment to improve the activity of the mordenite, then steam explosion treatment is carried out to improve the specific surface area of the mordenite, then corona treatment is carried out to ensure that the surface is rough, the surface area and the activity are further enhanced, then coupling treatment is carried out to improve the contact effect of the mordenite with organic materials such as natural rubber, synthetic rubber and the like, so that bridging connection effect is formed between inorganic filler and the organic materials, then lauryl gallate, sorbitan sesquioleate and monolaurate are adopted for softening treatment to enhance the affinity between the inorganic and organic materials, and the mordenite is fibrillar, so that the rubber raw materials can be linearly connected, thereby a three-dimensional network structure formed between the raw materials is tighter in the vulcanization process, thereby improving the performances of the material such as weather resistance and the like.

(3) In the preparation of the insulating material for the cover plate of the capacitor, the raw materials are fully mixed by high-speed stirring and low-speed stirring in sections, then are mixed at a plurality of sections of temperatures in a kneading machine, and finally are vulcanized, so that the synergistic effect with the synergistic agent and the serpentine is achieved, the synergistic agent, the serpentine raw material and other raw materials are better vulcanized, the formed three-dimensional network structure is more compact and firm, and the prepared material has better weather resistance, insulation and temperature resistance.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.