CN111303589A - Preparation method of composite insulating cross arm core body - Google Patents
Preparation method of composite insulating cross arm core body Download PDFInfo
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- CN111303589A CN111303589A CN202010264017.3A CN202010264017A CN111303589A CN 111303589 A CN111303589 A CN 111303589A CN 202010264017 A CN202010264017 A CN 202010264017A CN 111303589 A CN111303589 A CN 111303589A
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- C08J2205/00—Foams characterised by their properties
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Abstract
The invention discloses a preparation method of a composite insulating cross arm core body, and belongs to the technical field of composite insulating cross arm core body manufacturing. A preparation method of a composite insulating cross arm core body comprises the following steps: a. weighing the following raw materials in parts by weight: 21125-28125 parts of red material; 25000-28000 parts of white materials; 925.5-1100.26 parts of hollow organic microspheres; 461.5-500.5 parts of a silane coupling agent; 231.5-300.5 parts of a defoaming agent; 1265-1525 parts of a dispersing agent; b. preparing modified hollow organic microspheres, and c, preparing a core filling primary material; d. preparing a core filling raw material; e. and preparing the composite insulating cross arm core body. It has the features of low pore merging and through hole rate, high closed hole rate and low water absorption. Thereby improving the corrosion resistance and the ageing resistance of the insulating material and achieving the purpose of improving the internal insulation performance.
Description
Technical Field
The invention relates to the technical field of manufacturing of composite insulating cross arm cores.
Background
The composite insulating cross arm used at present adopts polyurethane materials as an inner core, adopts polyol (white materials) and isocyanate (black materials) to weigh according to different proportions, then mixes and pours into a mould to foam, and the composite insulating cross arm core is obtained after curing and molding, has the characteristics of solid and hollow materials, has lighter weight, but has the defects of poor interface bonding of the cross arm due to a heterogeneous interface between the cross arm and a cross arm core rod, and has the defects of uneven inflation bubbles and poor closed pore rate, high water absorption rate, easy hydrolysis and the like, and the cross arm can accelerate the aging of the cross arm and reduce the insulating strength under the long-term external rainwater environment (especially high-salt spray environment).
Therefore, it is very important to design a novel inner filling material and an interface bonding process thereof to solve the problem of high water absorption of the inner insulation interface of the existing inner filling type cross arm.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a composite insulating cross arm core, which has the characteristics of low hole merging and through hole rate, high closed hole rate and low water absorption rate. Thereby improving the corrosion resistance and the ageing resistance of the insulating material and achieving the purpose of improving the internal insulation performance.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a composite insulating cross arm core body comprises the following steps:
a. weighing the following raw materials in parts by weight: 21125-28125 parts of red material; 25000-28000 parts of white materials; 925.5-1100.26 parts of hollow organic microspheres; 461.5-500.5 parts of a silane coupling agent; 231.5-300.5 parts of a defoaming agent; 1265-1525 parts of a dispersing agent; the red material is any one of the following materials: triethylene diamine, dimethylamino ethyl ether, stannous octoate and pentamethyl diethylene triamine; the white material is E-51 type epoxy resin; the silane coupling agent is gamma-aminopropyl triethoxysilane; the defoaming agent is any one of the following substances: polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, polydimethylsiloxane; the dispersant is any one of the following: fatty acids, fatty amides or esters;
b. b, preparing modified hollow organic microspheres, mixing the hollow organic microspheres weighed in the step a with a silane coupling agent, and stirring for 5min at the rotating speed of 1000-1500 r/min to obtain the modified hollow organic microspheres;
c. preparing a core filling initial material, mixing and stirring the red material weighed in the step a and the modified hollow organic microspheres obtained in the step b uniformly, then mixing and stirring the red material and the white material weighed in the step a uniformly, then mixing and stirring the mixture with the defoaming agent and the dispersing agent weighed in the step a, and stirring the mixture for 1 to 2 minutes at the rotating speed of 1000 to 1800r/min to obtain the core filling initial material;
d. c, preparing a core filling raw material, standing the core filling initial material obtained in the step c in a vacuum drying oven for 50-80 min, taking out, stirring the core filling initial material at the rotating speed of 1000-1800 r/min for 50-80 s to ensure that the modified hollow organic microspheres are uniformly distributed, and then placing the core filling raw material in the vacuum drying oven for vacuumizing until no bubbles overflow on the surface, so as to obtain the core filling raw material;
e. and (d) preparing a composite insulating cross arm core body, filling the core body filling raw material obtained in the step (d) into a preheated composite insulating cross arm mould, curing for more than 12 hours at 65-100 ℃, and taking out a cured product from the composite insulating cross arm mould, wherein the product is the composite insulating cross arm core body.
The invention further improves that:
the physical parameters of the hollow organic microspheres weighed in the step a are as follows: a density of 0.06 to 0.26g/cm3, an average particle diameter of 1 to 100 μm, and a wall thickness of 0.14 to 1.24 μm.
In the step a, the raw materials and the parts by weight thereof are weighed as follows: 24600 parts of red material; 26500 parts of white material; 1012.88 parts of hollow organic microspheres; 481 parts of a silane coupling agent; 266 parts of defoaming agent; 1395 parts of dispersing agent.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
polyurethane foams have low closed cell content and high water absorption, and have serious interfacial problems when used as cross-arm fillers. As can be seen from a scanning electron microscope image (see figure 1) of the composite insulating cross arm core prepared by the invention and a scanning electron microscope image (see figure 3) of the currently adopted composite insulating cross arm core material, the epoxy resin and the hollow organic microspheres reduce the filling density, and in addition, the organic microspheres have the characteristics of high closed porosity, control of hygroscopicity and improvement of strong structure, so that the filler provided by the invention has better electrical properties. Compared with the traditional polyurethane foaming, the epoxy resin and hollow organic microsphere material has higher dielectric strength and lower dielectric loss, and in addition, has excellent matrix performance and reliable matrix/filler interface bonding performance.
According to the leakage current diagram (shown in figure 2) of the core material of the composite insulating cross arm prepared by the invention and the current diagram (shown in figure 4) of the core material of the composite insulating cross arm adopted at present, the current test piece of the core material (polyurethane) of the composite insulating cross arm is pressurized to 12kv in about 20s, the leakage current reaches 80000 muA at the moment, the test piece starts to breakdown and discharge only after being stabilized for about 8s, and the insulating effect is poor. The leakage current value of the test piece made of the composite insulating cross arm core body material prepared by the method is stabilized at 19 muA after being pressurized to 12kv, is approximately 4000 times lower than that of a polyurethane test piece, and the test piece can be kept stable for a long time under 12kv and has good insulating effect.
The modified hollow organic microspheres obtained by mixing and stirring the hollow organic microspheres and the silane coupling agent enable the surfaces of the hollow organic microspheres to be attached with a layer of liquid coupling film, and the hollow organic microspheres are combined with the epoxy resin more compactly after being cured.
It has the features of low pore merging and through hole rate, high closed hole rate and low water absorption. Thereby improving the corrosion resistance and the ageing resistance of the insulating material and achieving the purpose of improving the internal insulation performance.
Drawings
FIG. 1 is a scanning electron micrograph of a composite insulated crossarm core made in accordance with example 2;
FIG. 2 is a graph of leakage current versus time after boiling the composite insulated crossarm core material for 24 hours in water, according to example 2, wherein the test piece has a bottom diameter of 6cm, a height of 3cm, and an applied voltage of 12 kv;
FIG. 3 is a scanning electron microscope image of a core material of a composite insulated cross arm adopted at present;
fig. 4 is a graph of leakage current and time after boiling the core material of the composite insulating cross arm for 24 hours, wherein the diameter of the bottom surface of the test piece is 6cm, the height is 3cm, and the applied voltage is 12 kv.
Detailed Description
The invention will be described in further detail below with reference to the figures and specific examples.
Example 1
A preparation method of a composite insulating cross arm core body comprises the following steps:
a. weighing the following raw materials in parts by weight: 21125-28125 parts of red material; 25000-28000 parts of white materials; 925.5-1100.26 parts of hollow organic microspheres; 461.5-500.5 parts of a silane coupling agent; 231.5-300.5 parts of a defoaming agent; 1265-1525 parts of a dispersing agent; the red material is any one of the following materials: triethylene diamine, dimethylamino ethyl ether, stannous octoate and pentamethyl diethylene triamine; the white material is E-51 type epoxy resin; the silane coupling agent is gamma-aminopropyl triethoxysilane; the defoaming agent is any one of the following substances: polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, polydimethylsiloxane; the dispersant is any one of the following: fatty acids, fatty amides or esters;
b. b, preparing modified hollow organic microspheres, mixing the hollow organic microspheres weighed in the step a with a silane coupling agent, and stirring for 5min at the rotating speed of 1000-1500 r/min to obtain the modified hollow organic microspheres;
c. preparing a core filling initial material, uniformly mixing and stirring the red material weighed in the step a and the modified hollow organic microspheres obtained in the step b (the microspheres and the red material are in a fluid state after being stirred, and the laboratory adopts double-head vacuum pouring, because the red material is viscous, the viscosity is too high after being mixed and combined with the microspheres, and adverse effects are caused on stirring and pouring), then uniformly mixing and stirring the red material and the white material weighed in the step a (the white material is viscous and is added later), then mixing the red material and the defoaming agent and the dispersing agent weighed in the step a, and stirring the mixture at the rotating speed of 1000-1800 r/min for 1-2 min to obtain the core filling initial material;
d. c, preparing a core filling raw material, standing the core filling initial material obtained in the step c in a vacuum drying oven for 50-80 min, taking out, stirring the core filling initial material at the rotating speed of 1000-1800 r/min for 50-80 s to ensure that the modified hollow organic microspheres are uniformly distributed, and then placing the core filling raw material in the vacuum drying oven for vacuumizing until no bubbles overflow on the surface, so as to obtain the core filling raw material;
e. and (d) preparing a composite insulating cross arm core body, filling the core body filling raw material obtained in the step (d) into a preheated composite insulating cross arm mould, curing for more than 12 hours at 65 ℃, and taking out a cured and molded product from the composite insulating cross arm mould, wherein the product is the composite insulating cross arm core body.
The physical parameters of the hollow organic microspheres weighed in the step a are as follows: a density of 0.06 to 0.26g/cm3, an average particle diameter of 1 to 100 μm, and a wall thickness of 0.14 to 1.24 μm.
Example 2
A preparation method of a composite insulating cross arm core body comprises the following steps:
a. weighing the following raw materials in parts by weight: 24600 parts of red material; 26500 parts of white material; 1012.88 parts of hollow organic microspheres; 481 parts of a silane coupling agent; 266 parts of defoaming agent; 1395 parts of a dispersing agent; the red material is triethylene diamine; the white material is E-51 type epoxy resin; the silane coupling agent is gamma-aminopropyl triethoxysilane; the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether; the dispersant is fatty acid;
b. b, preparing modified hollow organic microspheres, mixing the hollow organic microspheres weighed in the step a with a silane coupling agent, and stirring for 5min at the rotating speed of 1000-1500 r/min to obtain the modified hollow organic microspheres;
c. preparing a core filling initial material, uniformly mixing and stirring the red material weighed in the step a and the modified hollow organic microspheres obtained in the step b (the microspheres and the red material are in a fluid state after being stirred, and the laboratory adopts double-head vacuum pouring, because the red material is viscous, the viscosity is too high after being mixed and combined with the microspheres, and adverse effects are caused on stirring and pouring), then uniformly mixing and stirring the red material and the white material weighed in the step a (the white material is viscous and is added later), then mixing the red material and the defoaming agent and the dispersing agent weighed in the step a, and stirring the mixture at the rotating speed of 1000-1800 r/min for 1-2 min to obtain the core filling initial material;
d. c, preparing a core filling raw material, standing the core filling initial material obtained in the step c in a vacuum drying oven for 50-80 min, taking out, stirring the core filling initial material at the rotating speed of 1000-1800 r/min for 50-80 s to ensure that the modified hollow organic microspheres are uniformly distributed, and then placing the core filling raw material in the vacuum drying oven for vacuumizing until no bubbles overflow on the surface, so as to obtain the core filling raw material;
e. and (d) preparing a composite insulating cross arm core body, filling the core body filling raw material obtained in the step (d) into a preheated composite insulating cross arm mould, curing for more than 12 hours at the temperature of 80 ℃, and taking out a cured and molded product from the composite insulating cross arm mould, wherein the product is the composite insulating cross arm core body.
The physical parameters of the hollow organic microspheres weighed in the step a are as follows: a density of 0.06 to 0.26g/cm3, an average particle diameter of 1 to 100 μm, and a wall thickness of 0.14 to 1.24 μm.
Example 3
A preparation method of a composite insulating cross arm core body comprises the following steps:
a. weighing the following raw materials in parts by weight: 28125 parts of red material; 28000 parts of white materials; 100.26 parts of hollow organic microspheres; 500.5 parts of a silane coupling agent; 300.5 parts of a defoaming agent; 1525 parts of a dispersing agent; the red material is any one of the following materials: triethylene diamine, dimethylamino ethyl ether, stannous octoate and pentamethyl diethylene triamine; the white material is E-51 type epoxy resin; the silane coupling agent is gamma-aminopropyl triethoxysilane; the defoaming agent is any one of the following substances: polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, polydimethylsiloxane; the dispersant is any one of the following: fatty acids, fatty amides or esters;
b. b, preparing modified hollow organic microspheres, mixing the hollow organic microspheres weighed in the step a with a silane coupling agent, and stirring for 5min at the rotating speed of 1000-1500 r/min to obtain the modified hollow organic microspheres;
c. preparing a core filling initial material, uniformly mixing and stirring the red material weighed in the step a and the modified hollow organic microspheres obtained in the step b (the microspheres and the red material are in a fluid state after being stirred, and the laboratory adopts double-head vacuum pouring, because the red material is viscous, the viscosity is too high after being mixed and combined with the microspheres, and adverse effects are caused on stirring and pouring), then uniformly mixing and stirring the red material and the white material weighed in the step a (the white material is viscous and is added later), then mixing the red material and the defoaming agent and the dispersing agent weighed in the step a, and stirring the mixture at the rotating speed of 1000-1800 r/min for 1-2 min to obtain the core filling initial material;
d. c, preparing a core filling raw material, standing the core filling initial material obtained in the step c in a vacuum drying oven for 50-80 min, taking out, stirring the core filling initial material at the rotating speed of 1000-1800 r/min for 50-80 s to ensure that the modified hollow organic microspheres are uniformly distributed, and then placing the core filling raw material in the vacuum drying oven for vacuumizing until no bubbles overflow on the surface, so as to obtain the core filling raw material;
e. and (d) preparing a composite insulating cross arm core body, filling the core body filling raw material obtained in the step (d) into a preheated composite insulating cross arm mould, curing for more than 12 hours at 100 ℃, and taking out a cured and molded product from the composite insulating cross arm mould, wherein the product is the composite insulating cross arm core body.
The physical parameters of the hollow organic microspheres weighed in the step a are as follows: a density of 0.06 to 0.26g/cm3, an average particle diameter of 1 to 100 μm, and a wall thickness of 0.14 to 1.24 μm.
Claims (3)
1. A preparation method of a composite insulating cross arm core body is characterized by comprising the following steps:
a. weighing the following raw materials in parts by weight: 21125-28125 parts of red material; 25000-28000 parts of white materials; 925.5-1100.26 parts of hollow organic microspheres; 461.5-500.5 parts of a silane coupling agent; 231.5-300.5 parts of a defoaming agent; 1265-1525 parts of a dispersing agent; the red material is any one of the following materials: triethylene diamine, dimethylamino ethyl ether, stannous octoate and pentamethyl diethylene triamine; the white material is E-51 type epoxy resin; the silane coupling agent is gamma-aminopropyl triethoxysilane; the defoaming agent is any one of the following substances: polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, polydimethylsiloxane; the dispersant is any one of the following: fatty acids, fatty amides or esters;
b. b, preparing modified hollow organic microspheres, mixing the hollow organic microspheres weighed in the step a with a silane coupling agent, and stirring for 5min at the rotating speed of 1000-1500 r/min to obtain the modified hollow organic microspheres;
c. preparing a core filling initial material, mixing and stirring the red material weighed in the step a and the modified hollow organic microspheres obtained in the step b uniformly, then mixing and stirring the red material and the white material weighed in the step a uniformly, then mixing and stirring the mixture with the defoaming agent and the dispersing agent weighed in the step a, and stirring the mixture for 1 to 2 minutes at the rotating speed of 1000 to 1800r/min to obtain the core filling initial material;
d. c, preparing a core filling raw material, standing the core filling initial material obtained in the step c in a vacuum drying oven for 50-80 min, taking out, stirring the core filling initial material at the rotating speed of 1000-1800 r/min for 50-80 s to ensure that the modified hollow organic microspheres are uniformly distributed, and then placing the core filling raw material in the vacuum drying oven for vacuumizing until no bubbles overflow on the surface, so as to obtain the core filling raw material;
e. and (d) preparing a composite insulating cross arm core body, filling the core body filling raw material obtained in the step (d) into a preheated composite insulating cross arm mould, curing for more than 12 hours at 65-100 ℃, and taking out a cured and molded product from the composite insulating cross arm mould, wherein the product is the composite insulating cross arm core body.
2. The method for preparing a composite insulating cross arm core according to claim 1, wherein: the physical parameters of the hollow organic microspheres weighed in the step a are as follows: a density of 0.06 to 0.26g/cm3, an average particle diameter of 1 to 100 μm, and a wall thickness of 0.14 to 1.24 μm.
3. A method of making a composite insulated crossarm core according to claim 1 or 2, characterised in that: in the step a, the raw materials and the parts by weight thereof are weighed as follows: 24600 parts of red material; 26500 parts of white material; 1012.88 parts of hollow organic microspheres; 481 parts of a silane coupling agent; 266 parts of defoaming agent; 1395 parts of dispersing agent.
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| CN202010264017.3A CN111303589A (en) | 2020-04-07 | 2020-04-07 | Preparation method of composite insulating cross arm core body |
| PCT/CN2021/080174 WO2021203903A1 (en) | 2020-04-07 | 2021-03-11 | Method for manufacturing composite insulating spar core |
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| WO2021203903A1 (en) * | 2020-04-07 | 2021-10-14 | 南方电网科学研究院有限责任公司 | Method for manufacturing composite insulating spar core |
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| CN110330632A (en) * | 2019-07-16 | 2019-10-15 | 华北电力大学（保定） | A kind of preparation method of the core packing material for composite insulation cross arm |
| CN110591291A (en) * | 2019-09-27 | 2019-12-20 | 福建师范大学 | Preparation method of coupling agent modified low-water-absorption solid buoyancy material |
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| CN100386379C (en) * | 2005-07-27 | 2008-05-07 | 武汉理工大学 | Hollow microbead reinforced epoxy resin composite material and its preparation method |
| US8734685B2 (en) * | 2008-02-11 | 2014-05-27 | Director General, Defence Reserch & Development Organization | Electrically conducting syntactic foam and a process for preparing the same |
| CN101456963B (en) * | 2009-01-04 | 2011-05-11 | 武汉理工大学 | Method for preparing microsphere composite foam material |
| CN108117635A (en) * | 2017-12-27 | 2018-06-05 | 成都锦汇科技有限公司 | A kind of compound cellular material of epoxy resin and preparation method thereof |
| CN111303589A (en) * | 2020-04-07 | 2020-06-19 | 华北电力大学（保定） | Preparation method of composite insulating cross arm core body |
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- 2021-03-11 WO PCT/CN2021/080174 patent/WO2021203903A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104072950A (en) * | 2014-07-17 | 2014-10-01 | 天津中材工程研究中心有限公司 | Raw material formula and preparation method for solid buoyancy material solidified at room temperature |
| CN109651764A (en) * | 2018-12-26 | 2019-04-19 | 天津中材工程研究中心有限公司 | A kind of solid buoyancy material and preparation method thereof of microballon compounding |
| CN110330632A (en) * | 2019-07-16 | 2019-10-15 | 华北电力大学（保定） | A kind of preparation method of the core packing material for composite insulation cross arm |
| CN110591291A (en) * | 2019-09-27 | 2019-12-20 | 福建师范大学 | Preparation method of coupling agent modified low-water-absorption solid buoyancy material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021203903A1 (en) * | 2020-04-07 | 2021-10-14 | 南方电网科学研究院有限责任公司 | Method for manufacturing composite insulating spar core |
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Application publication date: 20200619 |