CN114149775B - Epoxy resin pouring sealant, canned pump stator and processing method thereof - Google Patents
Epoxy resin pouring sealant, canned pump stator and processing method thereof Download PDFInfo
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- CN114149775B CN114149775B CN202111337892.0A CN202111337892A CN114149775B CN 114149775 B CN114149775 B CN 114149775B CN 202111337892 A CN202111337892 A CN 202111337892A CN 114149775 B CN114149775 B CN 114149775B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
- C08G59/22—Di-epoxy compounds
- C08G59/226—Mixtures of di-epoxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
- C08G59/22—Di-epoxy compounds
- C08G59/24—Di-epoxy compounds carbocyclic
- C08G59/245—Di-epoxy compounds carbocyclic aromatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/56—Amines together with other curing agents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/62—Alcohols or phenols
- C08G59/621—Phenols
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
- H02K15/026—Wound cores
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/10—Applying solid insulation to windings, stators or rotors
- H02K15/105—Applying solid insulation to windings, stators or rotors to the windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2170/00—Compositions for adhesives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2190/00—Compositions for sealing or packing joints
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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Abstract
The invention relates to an epoxy resin pouring sealant, a canned pump stator and a processing method thereof. The epoxy resin pouring sealant comprises the following components in percentage by mass: 54-72% of MC62 BK CR resin, 5-8% of W363NC CR curing agent and 20-40% of talcum powder. The raw materials of the epoxy resin pouring sealant comprise MC62 BK CR resin, W363NC CR curing agent and talcum powder in specific types and proportions, the epoxy resin pouring sealant has proper fluidity, better pressure resistance and proper hardness after curing, the cured epoxy resin pouring sealant has small hardness change between room temperature and 210 ℃, the pressure resistance is better, the epoxy resin pouring sealant is not easy to crack, and the use requirement of a shielding pump can be met. According to the processing method of the canned motor pump stator, the epoxy resin pouring sealant is poured into the slot wedge above the stator winding, so that the inter-turn insulation of the winding coil on the stator can be ensured, and the high temperature and high pressure resistance of the canned motor pump can be ensured.
Description
Technical Field
The invention relates to the technical field of canned motor pumps, in particular to an epoxy resin pouring sealant, a canned motor pump stator and a processing method thereof.
Background
The shield pump is a leakage-free pump which is formed by integrating a shield motor and a pump, and mainly comprises a pump body, an impeller, a stator, a rotor, a front bearing, a rear bearing, a thrust disc and other parts, wherein the stator and the rotor are separated by a shield sleeve made of a non-magnetic thin-wall material, and the rotor is supported by the front bearing and the rear bearing and immersed in a conveying medium. When the shielding pump operates, the shielding pump is widely applied to the application places such as petrochemical industry, nuclear power field, reaction pair cooling and purifying system with special requirements, related test pipelines and the like due to the advantages of low noise, no leakage, no pollution (environmental protection), high reliability and the like.
The pump and drive motor of the canned pump are both sealed in a pressure vessel filled with the pumping medium, which is only static sealed, and a set of wires provides the rotating magnetic field and drives the rotor. This structure eliminates the rotary shaft sealing device of the conventional centrifugal pump, so that no leakage is achieved. The canned motor pump mainly connects the pump with the motor organically, the rotor of the motor and the impeller of the pump are arranged on a shaft, the rotor and the stator of the motor are separated through the canned motor sleeve, the rotor runs in a conveyed medium, and the power of the rotor is mainly transmitted to the rotor by using the magnetic field of the stator. The rotor and stator of the motor are sealed by a thin-walled cylinder of a shielding sleeve, so that the motor winding is not contacted with the conveyed liquid. Compared with the traditional centrifugal pump, the design has great innovation and can achieve the effect of zero leakage.
However, when the conventional canned motor pump stator is in operation, because the motor winding coil on the stator can slightly displace and deform, relative displacement exists between the turn-to-turn copper wires, which is easy to cause short circuit or discharge and is unfavorable for the normal operation of the canned motor pump. In some canned pumps, the canned pump stator is protected by casting epoxy in the stator slots, however, the performance of conventional epoxy is generally difficult to meet the high temperature and high pressure operating requirements of canned pumps.
Disclosure of Invention
Based on the above, it is necessary to provide an epoxy resin pouring sealant having both good pressure resistance and suitable hardness and a preparation method thereof.
In addition, a canned motor pump stator and a processing method thereof are also provided.
The invention provides an epoxy resin pouring sealant, which is characterized by comprising the following components in percentage by mass:
54-72% of MC62 BK CR resin,
W363NC CR curing agent 5% -8%
20-40% of talcum powder.
In some embodiments, the MC62 BK CR resin is 60% to 70% by mass; the weight percentage of the W363NC CR curing agent is 5-8%; the mass percentage of the talcum powder is 25% -35%.
In some embodiments, the MC62 BK CR resin is 61-66% by mass; the weight percentage of the W363NC CR curing agent is 6% -7%; the mass percentage of the talcum powder is 27% -32%.
In some of these embodiments, the MC62 BK CR resin is 63% by mass; the weight percentage of the W363NC CR curing agent is 7%; the mass percentage of talcum powder is 30%.
In some of these embodiments, the MC62 BK CR resin is composed of, in mass percent:
in some embodiments, the W363NC CR curing agent consists of the following components in percentage by mass:
in another aspect of the present invention, a preparation method of the epoxy resin pouring sealant is provided, including the following steps:
and uniformly mixing the MC62 BKCR resin, the W363NC CR curing agent and the talcum powder.
In another aspect of the present invention, a method for manufacturing a stator of a canned motor pump is provided, comprising the steps of:
taking the epoxy resin pouring sealant for standby;
pouring the epoxy resin pouring sealant between a slot wedge of a stator of the canned motor pump and the stator canned motor pump;
and heating and curing the shielding pump stator poured with the epoxy resin pouring sealant.
In some embodiments, the step of pouring the epoxy potting adhesive between the slot wedge of the canned pump stator and the stator canned pump is performed by horizontal injection.
The invention also provides a shielding pump stator, which comprises a stator shielding sleeve, a stator winding and a slot wedge above the stator winding, wherein the epoxy resin pouring sealant is arranged between the slot wedge and the stator shielding sleeve.
The raw materials of the epoxy resin pouring sealant comprise MC62 BK CR resin, W363NC CR curing agent and talcum powder in specific types and proportions, the epoxy resin pouring sealant has proper fluidity, good pressure resistance and proper hardness after curing, the cured epoxy resin pouring sealant has small hardness change between room temperature and 210 ℃, the pressure resistance is good, the epoxy resin pouring sealant is not easy to crack, and the use requirement of a shielding pump can be met. According to the processing method of the canned motor pump stator, the epoxy resin pouring sealant is poured into the slot wedge above the stator winding, so that the inter-turn insulation of the winding coil on the stator can be ensured, and the high temperature and high pressure resistance of the canned motor pump can be ensured. The stator is applied to a canned motor pump, so that the use safety is higher.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a canned motor pump stator according to an embodiment of the present invention;
FIG. 2 shows the cracking of the pouring sealants of examples 1 to 3 and comparative examples 1 to 4 according to the present invention after the punching test; wherein 1 to 7 each represent: comparative example 1, comparative example 2, comparative example 3, example 1, example 2, comparative example 4 and example 3;
fig. 3 is a photograph of a canned motor stator according to an embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention provides an epoxy resin pouring sealant, which comprises the following components in percentage by mass:
54-72% of MC62 BK CR resin,
W363NC CR curing agent 5% -8%
20-40% of talcum powder.
The MC62 BK CR resin and the W363NC CR curing agent are MC62/W363 two-component epoxy resin pouring sealant provided by ELANTAS company. MC62/W363 bi-component epoxy resin pouring sealant has the characteristics of small curing heat release, low shrinkage and good heat conducting property.
The MC62 BK CR resin comprises the following components in percentage by mass:
the factory properties of the MC62 BK CR resin are shown in Table 1.
TABLE 1 factory Property of MC62 BK CR resin
The W363NC CR curing agent comprises the following components in percentage by mass:
the factory properties of the W363NC CR curing agent are shown in Table 2.
TABLE 2 factory Property of W363NC CR curing agent
The raw materials of the epoxy resin pouring sealant comprise MC62 BK CR resin, W363NC CR curing agent and talcum powder in specific types and proportions, the epoxy resin pouring sealant has proper fluidity, good pressure resistance and proper hardness after curing, the cured epoxy resin pouring sealant has small hardness change between room temperature and 210 ℃, the pressure resistance is good, the epoxy resin pouring sealant is not easy to crack, and the use requirement of a shielding pump can be met.
Specifically, talcum powder is magnesium silicate mineral talcum, and the main component is hydrous magnesium silicate, and is prepared by crushing, treating with hydrochloric acid, washing with water and drying. Talcum powder has excellent physical and chemical properties such as lubricity, fire resistance, acid resistance, insulativity, high melting point, chemical inactivity, good covering power, softness, good luster, strong adsorption force and the like; the adhesive can be added into the epoxy resin pouring sealant to adjust the viscosity of the pouring sealant, control the fluidity of the pouring sealant and improve the mechanical property of the epoxy resin pouring sealant.
In some of these embodiments, the MC62 BK CR resin is 60% to 70% by mass. Further, the mass percentage of MC62 BK CR resin is 61% -66%. Specifically, the mass percentage of the MC62 BK CR resin may be 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69% or 70%.
In some embodiments, the W363NC CR curing agent is 5 to 8 mass percent. Further, the mass percentage of the W363NC CR curing agent is 6-7%. Specifically, the mass percentage of the W363NC CR curing agent may be 5%, 5.5%, 6%, 6.5%, 7%, 7.5% or 8%.
In some embodiments, the talc is 25% to 35% by mass. Further, the mass percentage of talcum powder is 27% -32%. Specifically, the mass percentage of the talcum powder can be 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% or 35%.
In some embodiments, the epoxy potting adhesive comprises the following components in percentage by mass:
60 to 70 percent of MC62 BK CR resin,
W363NC CR curing agent 5% -8%
25-35% of talcum powder.
In some embodiments, the epoxy potting adhesive comprises the following components in percentage by mass:
61-66% of MC62 BK CR resin,
W363NC CR curing agent 6% -7%
27% -32% of talcum powder.
Preferably, the epoxy resin pouring sealant comprises the following components in percentage by mass:
55% MC62 BK CR resin,
W363NC CR hardener 5%
Talcum powder 40%.
Preferably, the epoxy resin pouring sealant comprises the following components in percentage by mass:
MC62 BK CR resin 59%,
W363NC CR hardener 6%
35% of talcum powder.
Preferably, the epoxy resin pouring sealant comprises the following components in percentage by mass:
MC62 BK CR resin 62%,
W363NC CR hardener 6%
32% of talcum powder.
Preferably, the epoxy resin pouring sealant comprises the following components in percentage by mass:
68% of MC62 BK CR resin,
W363NC CR hardener 7%
Talcum powder 25%.
Preferably, the epoxy resin pouring sealant comprises the following components in percentage by mass:
MC62 BK CR resin 72%,
W363NC CR hardener 8%
20% of talcum powder.
More preferably, the epoxy resin pouring sealant comprises the following components in percentage by mass:
MC62 BK CR resin 63%,
W363NC CR hardener 7%
Talcum powder 30%.
The epoxy resin pouring sealant has proper fluidity and excellent mechanical property after solidification, and is particularly suitable for processing and reinforcing of a shielding pump stator; and is suitable for horizontal glue injection process, and has simple use and operation.
The invention also provides a preparation method of the epoxy resin pouring sealant, which comprises the following steps:
and uniformly mixing MC62 BK CR resin, W363NC CR curing agent and talcum powder to prepare the epoxy resin pouring sealant for later use.
Referring to fig. 1, another embodiment of the present invention further provides a method for processing a stator of a canned motor pump, which includes the following steps S110 to S130.
Step S110: taking the epoxy resin pouring sealant for standby.
Step S120: and pouring epoxy resin pouring sealant between the slot wedge of the shielding pump stator and the stator shielding sleeve.
Step S130: and heating and curing the shielding pump stator poured with the epoxy resin pouring sealant.
According to the processing method of the canned motor pump stator, the epoxy resin pouring sealant is poured between the slot wedge above the stator winding and the stator shielding sleeve, so that the turn-to-turn insulation of the winding coil on the stator can be ensured, and the high temperature and high pressure resistance of the canned motor pump can be ensured.
In some of these embodiments, the epoxy potting adhesive is poured between the slot wedge of the canned pump stator and the stator can in a horizontal type of injection. Because the epoxy resin pouring sealant has proper viscosity and good fluidity, the epoxy resin pouring sealant can be poured into the stator slot wedge by matching with horizontal glue injection, and compared with the traditional glue injection technology, the epoxy resin pouring sealant is simpler, easy to operate and higher in reliability.
In some of these embodiments, the temperature of the heat cure is from 60 ℃ to 80 ℃. Alternatively, the heat curing temperature is 60 ℃, 62 ℃, 64 ℃, 66 ℃, 68 ℃, 70 ℃, 72 ℃, 74 ℃, 76 ℃, 78 ℃ or 80 ℃.
In some of these embodiments, the time of heat curing is from 8 hours to 10 hours. Alternatively, the time of heat curing is 8 hours, 8.5 hours, 9 hours, 9.5 hours, or 10 hours.
In some of these embodiments, prior to step S120, a step of cleaning the stator slot wedge is further included to ensure that the stator slot wedge is free of impurities, avoiding that the impurities have a negative effect on the performance of the processed stator.
In some of these embodiments, after step S130, a step of naturally cooling the stator is further included.
In some of these embodiments, the method further comprises the step of polishing the stator cooled to ambient temperature. Colloid escaping from the stator chamber is removed through polishing, and the inside of the stator chamber is ensured to be smooth.
In some of these embodiments, the step of grinding is performed using a soft grinding head.
The invention also provides a shielding pump stator, which comprises a stator winding and a slot wedge above the stator winding, wherein the epoxy resin pouring sealant is arranged in the slot wedge.
The shielding pump stator is poured into the slot wedge above the stator winding by the epoxy resin pouring sealant, so that the inter-turn insulation of the winding coil on the stator can be ensured, and the high temperature and high pressure resistance of the shielding pump can be ensured. The research shows that the shielding pump adopting the stator of the shielding pump can safely and reliably operate, the pouring sealant can bear high temperature and high pressure, and abnormal conditions such as cracking, softening and the like can not occur in the operation process of the shielding pump, and the turn-to-turn insulation of the winding coil on the stator is ensured, so that the safety is better.
The epoxy resin pouring sealant of the present invention is further described below by way of specific examples.
Example 1:
the epoxy resin pouring sealant of the embodiment comprises the following raw materials in percentage by mass:
MC62 BK CR resin 63%,
W363NC CR hardener 7%
Talcum powder 30%.
Example 2:
the epoxy resin pouring sealant of the embodiment comprises the following raw materials in percentage by mass:
55% MC62 BK CR resin,
W363NC CR hardener 5%
Talcum powder 40%.
Example 3:
the epoxy resin pouring sealant of the embodiment comprises the following raw materials in percentage by mass:
MC62 BK CR resin 72%,
W363NC CR hardener 8%
20% of talcum powder.
Comparative example 1:
the epoxy resin pouring sealant of the comparative example comprises the following raw materials in percentage by mass:
77% of MC62 BK CR resin,
W363NC CR hardener 8%
15% of talcum powder.
Comparative example 2:
the epoxy resin pouring sealant of the comparative example comprises the following raw materials in percentage by mass:
22% of MC62 BK CR resin,
W363NC CR hardener 2%
Talcum powder 76%.
Comparative example 3:
the epoxy resin pouring sealant of the comparative example comprises the following raw materials in percentage by mass:
MC62 BK CR resin 91%
W363NC CR hardener 9%.
Comparative example 4:
the pouring sealant of the comparative example adopts a type-JX 101 AB glue of Jinxin company, and the type-JX 101 AB glue is an AB glue of an epoxy resin system. Wherein the tensile shear strength of the AB glue of the model JX101 is 18MPa, the uneven pull-off strength is more than or equal to 210N/cm, the curing time is less than or equal to 24 hours at 25 ℃, and the working temperature is 175 ℃. In the comparative example, the adhesive is prepared according to the use instruction 1:1 of the AB adhesive of the model JX101, namely, comprises the following components in percentage by mass:
50% of JX101 type A adhesive
50% of JX101 model B glue.
Comparative example 5:
the pouring sealant of the comparative example further comprises talcum powder on the basis of the AB glue of the JX101 model of comparative example 4. The method comprises the following steps of:
35% of JX101 type A adhesive,
35% of JX101 type B adhesive
Talcum powder 30%
The proportions of the pouring sealants of examples 1 to 3 and comparative examples 1 to 5 and the forms of the pouring sealants are shown in Table 3.
TABLE 3 formulation and State of pouring sealant
As can be seen from the data in table 3, the pouring sealants of examples 1 to 3 and comparative example 5 have more suitable fluidity and are more suitable for the injection process. And the potting adhesives of comparative examples 1, 3 and 4 are lower and are more difficult to apply to the glue injection process. The pouring sealant of comparative example 2 was in a semi-cured state and was not suitable for the injection process.
In addition, the epoxy resin pouring sealant of comparative example 3 was prepared according to the recommended formulation of MC62/W363 type pouring sealant, and the physicochemical properties thereof are shown in Table 4.
TABLE 4 physicochemical Properties of MC62/W363 type pouring sealant
The pouring sealants prepared in examples 1 to 3 and comparative examples 1 to 5 were placed in an oven and heated at 75℃for two hours, and it was observed that the pouring sealants prepared in examples 1 to 3 and comparative examples 1 to 5 were all flowable, but did not cure completely.
In order to provide epoxy potting adhesives capable of achieving the processing of the EC4G5-464C5-4SP type canned pump stator, the applicant conducted the following further study on the potting adhesives formulated in examples 1 to 3 and comparative examples 1 to 5.
Specifically, the operating parameters of the EC4G5-464C5-4SP model canned motor pump are shown in Table 5.
TABLE 5 operating parameters of EC4G5-464C5-4SP model canned motor pump
| Parameters (parameters) | Numerical value |
| Design pressure (MPa) | 20 |
| Design temperature (. Degree. C.) | 350 |
| Maximum working pressure (MPa) | 16 |
| Maximum operating temperature (. Degree. C.) | 300 |
| Motor power (kW) | 150 |
| Rated flow (m) 2 /h) | 320 |
| Rated lift (MPa) | 1.2 |
| Rated current/voltage/phase number/frequency (A/V/Pha/H) | 364.6/380/3/50 |
| Rated rotation speed (r/min) | 1500 |
| Cavitation margin (m) | 4.3 |
Heat resistance and hardness test
Because the motor of the EC4G5-464C5-4SP type shielding pump is of C-level insulation design, the temperature resistance requirement is 200 ℃. Therefore, following the design of the canned motor pump, the pouring sealants of examples 1 to 3 and comparative examples 1 to 5 were tested according to the following test scheme:
the pouring sealants of examples 1 to 3 and comparative examples 1 to 5 were respectively put into an oven to be baked, four temperature gradients of 150 ℃, 170 ℃, 190 ℃ and 210 ℃ were set, the pouring sealant was kept warm for at least half an hour after reaching the corresponding temperature, and after the heat preservation was completed, the pouring sealant was taken out from the oven, the hardness and the curing state of the pouring sealant at the temperature were observed, and two sets of data were recorded for each sample. The hardness data of the pouring sealants of examples 1 to 3 and comparative examples 1 to 5 at different temperatures are shown in Table 6.
Bearing capacity test
The pouring sealants of examples 1 to 3 and comparative examples 1 to 5, which were cured by heating, were respectively placed in a press test apparatus to perform a test, the pressure was slowly increased to the upper limit (10000N), whether the sample cracked or not was observed and recorded, and the pressure value at the time of cracking was recorded. The pressure-bearing cracking data of the cured potting adhesives of examples 1 to 3 and comparative examples 1 to 5 are shown in Table 6.
Table 6 heat and pressure resistance and hardness data of the potting adhesives of examples 1 to 3 and comparative examples 1 to 5
The cured pouring sealants of examples 1 to 3 and comparative examples 1 to 5 can meet the requirements of C-level insulation design. As can be seen from the data in table 6, the potting adhesives of examples 1 to 3 have insignificant changes in hardness and good heat resistance at temperatures below 210 ℃. The pouring sealants of examples 1 to 3 added talc powder in a certain proportion, had good pressure bearing capacity, and did not find cracking in the punching test. However, the ratio of talc powder was too high or too low, and the pressure bearing capacity of the pouring sealant was lowered, and the pouring sealants of comparative examples 1 to 3 cracked under 8800N, 9900N and 8700N pressures, respectively.
The pouring sealants of examples 4 to 5 were prepared from a type JX101 AB glue, which showed a significant decrease in hardness after heating, and had a certain elasticity at 210℃with a large change in properties, and could not meet the requirements for a canned motor pump.
Referring to fig. 2, in order to show the cracking conditions of the pouring sealants of examples 1 to 3 and comparative examples 1 to 4 after the punching test, it can be seen that the pouring sealants of examples 1 to 3 did not find cracking in the punching test.
Further, the applicant processed the stator of the EC4G5-464C5-4SP model canned motor pump with the epoxy potting adhesive of example 1, the processing steps being as follows:
(1) Cleaning a slot wedge above the stator winding, and removing impurities;
(2) Fixing two ends of a stator, and injecting the epoxy resin pouring sealant of the embodiment 1 into a slot wedge above a stator winding by using a horizontal glue injection machine;
(3) Placing the stator with the glue injection into a baking oven, and drying for 8 hours at the temperature of 75 ℃ to solidify the epoxy resin pouring sealant;
(4) Taking out the stator, and cooling to room temperature;
(5) The stator is polished by a soft grinding head, so that the inside of a stator chamber of the glue injection is smooth and has no concave-convex phenomenon.
Referring to fig. 3, the stator bore is smooth and flat for a machined canned motor pump stator. Through tests, the shielding pump processed by the method can run safely and reliably, the pouring sealant can bear high temperature and high pressure, abnormal conditions such as cracking and softening can not occur in the running process of the shielding pump, turn-to-turn insulation of winding coils on a stator is ensured, and therefore the safety is better.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present invention, which facilitate a specific and detailed understanding of the technical solutions of the present invention, but are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. It should be understood that, based on the technical solutions provided by the present invention, those skilled in the art obtain technical solutions through logical analysis, reasoning or limited experiments, all of which are within the scope of protection of the appended claims. The scope of the patent is therefore intended to be covered by the appended claims, and the description and drawings may be interpreted as illustrative of the contents of the claims.
Claims (8)
1. The epoxy resin pouring sealant is characterized by comprising the following components in percentage by mass:
54-72% of MC62 BK CR resin,
W363NC CR curing agent 5% -8%
20% -40% of talcum powder;
wherein the MC62 BK CR resin and the W363NC CR curing agent are MC62/W363 bi-component epoxy resin pouring sealant provided by ELANTAS company;
the MC62 BK CR resin comprises the following components in percentage by mass:
15% of bisphenol A epichlorohydrin copolymer,
28% of ethylene oxide methyl ether,
12% of 1, 6-hexanediol diglycidyl ether
45% of aluminum hydroxide;
the W363NC CR curing agent comprises the following components in percentage by mass:
50% of polyether amine,
30% of N-aminoethylpiperazine,
Isophoronediamine 7%
Bisphenol A8%.
2. The epoxy resin pouring sealant according to claim 1, wherein the mass percentage of the MC62 BK CR resin is 60% -70%; the weight percentage of the W363NC CR curing agent is 5% -8%; the mass percentage of talcum powder is 25% -35%.
3. The epoxy resin pouring sealant according to claim 1, wherein the mass percentage of the MC62 BK CR resin is 61% -66%; the weight percentage of the W363NC CR curing agent is 6% -7%; the mass percentage of talcum powder is 27% -32%.
4. The epoxy potting adhesive of claim 1, wherein the mass percent of the MC62 BK CR resin is 63%; the weight percentage of the W363NC CR curing agent is 7%; the mass percentage of talcum powder is 30%.
5. The method for preparing the epoxy resin pouring sealant according to any one of claims 1 to 4, which is characterized by comprising the following steps:
and uniformly mixing the MC62 BKCR resin, the W363NC CR curing agent and the talcum powder.
6. The processing method of the canned motor pump stator is characterized by comprising the following steps:
taking the epoxy resin pouring sealant according to any one of claims 1-4 for later use;
pouring the epoxy resin pouring sealant between a slot wedge of a stator of the canned pump and a stator shielding sleeve;
and heating and curing the shielding pump stator poured with the epoxy resin pouring sealant.
7. The method of claim 6, wherein the step of pouring the epoxy resin pouring sealant between the slot wedge of the canned pump stator and the stator shielding sleeve is horizontal pouring sealant.
8. The canned motor pump stator is characterized by comprising a stator shielding sleeve, a stator winding and a slot wedge at the upper part of the stator winding, wherein the epoxy resin pouring sealant according to any one of claims 1-4 is arranged between the slot wedge and the stator shielding sleeve.
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| CN101671426B (en) * | 2009-09-28 | 2011-12-28 | 台州豪贝泵业有限公司 | Epoxy resin composition used for shielding deep well submersible pump and casting method thereof |
| CN102304275B (en) * | 2011-07-25 | 2012-12-26 | 株洲时代新材料科技股份有限公司 | Room-temperature curing epoxy resin pouring sealant for permanent magnet motor as well as preparation method and process thereof |
| CN106867438A (en) * | 2017-03-06 | 2017-06-20 | 固德电材系统（苏州）股份有限公司 | A kind of epoxy resin embedding adhesive and its application method |
| US11332656B2 (en) * | 2019-12-18 | 2022-05-17 | Saudi Arabian Oil Company | LCM composition with controlled viscosity and cure time and methods of treating a lost circulation zone of a wellbore |
| US11370956B2 (en) * | 2019-12-18 | 2022-06-28 | Saudi Arabian Oil Company | Epoxy-based LCM compositions with controlled viscosity and methods of treating a lost circulation zone of a wellbore |
| US11193052B2 (en) * | 2020-02-25 | 2021-12-07 | Saudi Arabian Oil Company | Sealing compositions and methods of plugging and abandoning of a wellbore |
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