CN109824986B - Power line insulating layer with high water resistance and preparation method thereof - Google Patents
Power line insulating layer with high water resistance and preparation method thereof Download PDFInfo
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- CN109824986B CN109824986B CN201910012978.2A CN201910012978A CN109824986B CN 109824986 B CN109824986 B CN 109824986B CN 201910012978 A CN201910012978 A CN 201910012978A CN 109824986 B CN109824986 B CN 109824986B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 47
- 229920002943 EPDM rubber Polymers 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000004709 Chlorinated polyethylene Substances 0.000 claims abstract description 23
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 19
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 6
- 239000003063 flame retardant Substances 0.000 claims abstract description 6
- 239000004014 plasticizer Substances 0.000 claims abstract description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 5
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 54
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- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 21
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 20
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 13
- 239000000347 magnesium hydroxide Substances 0.000 claims description 13
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 13
- ZFMQKOWCDKKBIF-UHFFFAOYSA-N bis(3,5-difluorophenyl)phosphane Chemical compound FC1=CC(F)=CC(PC=2C=C(F)C=C(F)C=2)=C1 ZFMQKOWCDKKBIF-UHFFFAOYSA-N 0.000 claims description 12
- OEIWPNWSDYFMIL-UHFFFAOYSA-N dioctyl benzene-1,4-dicarboxylate Chemical compound CCCCCCCCOC(=O)C1=CC=C(C(=O)OCCCCCCCC)C=C1 OEIWPNWSDYFMIL-UHFFFAOYSA-N 0.000 claims description 11
- JNXDCMUUZNIWPQ-UHFFFAOYSA-N trioctyl benzene-1,2,4-tricarboxylate Chemical compound CCCCCCCCOC(=O)C1=CC=C(C(=O)OCCCCCCCC)C(C(=O)OCCCCCCCC)=C1 JNXDCMUUZNIWPQ-UHFFFAOYSA-N 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
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Abstract
The application relates to the technical field of materials, in particular to a power line insulating layer with high water resistance and a preparation method thereof. The power cord insulating layer comprises raw material components including rubber material, filler, plasticizer and flame retardant, wherein the rubber material includes at least one of polyvinyl chloride, chlorinated polyethylene, ethylene propylene diene monomer and POE, and by total weight of the raw material components of the power cord insulating layer, the content of the polyvinyl chloride is a%, the content of the chlorinated polyethylene is b%, the content of the ethylene propylene diene monomer is c%, the content of the ethylene propylene diene monomer is d%, and the content of the POE is e%, and the power cord insulating layer satisfies the following requirements: 0.3a +0.5b + c + d + e is more than or equal to 28. Through controlling the key material composition of the power cord raw and other materials, the quality problem is solved from the source, and the technical problems of the after-sale power cord, such as reduction of insulation resistance, reduction of voltage resistance, and electric wire burnout and fire caused by the reduction of voltage resistance under the condition of soaking in water, are effectively prevented.
Description
Technical Field
The application relates to the technical field of materials, in particular to a power line insulating layer with high water resistance and a preparation method thereof.
Background
The inside and outside machine of split air conditioner need be connected through the power cord, and the power cord that connects is mostly in outdoor, receives the environmental impact great, exists the condition of being soaked by water for a long time, and the power cord is under this condition, easily appears insulation resistance and descends, causes the electric wire to burn out, even fires scheduling problem. At present, for the after-sale problem, the experimental method adopted is long-term water soaking simulation or high-temperature water boiling method to verify whether the product can meet the use under long-term water condition. The experiment period of soaking and boiling is long, which is not beneficial to the control of the product quality. Through the correlation research on the composition of the product material and the boiling resistance, the optimal material proportion is found, and the improvement of the water resistance of the product is necessary.
Disclosure of Invention
In order to solve the above technical problems, or at least partially solve the above technical problems, a primary object of the present invention is to overcome the problems of the prior art and to provide an insulating layer product for a power line having high water resistance.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a power supply line insulating layer having high water resistance.
According to the power cord insulating layer of high water proofness of this application embodiment, its raw materials composition includes sizing material, filler, plasticizer and fire retardant, the sizing material includes at least one in polyvinyl chloride, chlorinated polyethylene, ethylene propylene diene monomer rubber and POE, by power cord insulating layer raw materials total weight, the content of polyvinyl chloride is a%, the content of chlorinated polyethylene is b%, the content of ethylene propylene diene monomer rubber is c%, the content of ethylene propylene diene monomer rubber is d%, the content of POE is e%, satisfy: 0.3a +0.5b + c + d + e is more than or equal to 28.
Further, 0.3a +0.5b + c + d + e is more than or equal to 30.
Further, the filler includes at least one of calcium carbonate and talc.
Further, the flame retardant comprises at least one of calcium carbonate and talc.
Further, the plasticizer includes at least one of dioctyl terephthalate, trioctyl trimellitate, and dioctyl adipate.
Further, the power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 15 to 22 percent of polyvinyl chloride, 23 to 27 percent of ethylene propylene diene monomer, the mixture of ethylene propylene diene monomer and POE, 12 to 20 percent of calcium carbonate, 25 to 35 percent of talcum powder, the mixture of magnesium oxide and magnesium hydroxide, and 0 to 5 percent of dioctyl terephthalate, trioctyl trimellitate and dioctyl adipate.
Further, the power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 16 to 20 percent of chlorinated polyethylene, 18 to 23 percent of mixture of ethylene propylene diene monomer, ethylene propylene diene monomer and POE, 12 to 20 percent of calcium carbonate, 31 to 41 percent of mixture of talcum powder, magnesium oxide and magnesium hydroxide, and 0 to 5 percent of mixture of dioctyl terephthalate, trioctyl trimellitate and dioctyl adipate.
Further, the power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 17% of chlorinated polyethylene, 24% of ethylene propylene rubber, 12% of calcium carbonate, 18% of talcum powder and 27% of magnesium oxide.
Further, the power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 15% of polyvinyl chloride, 26% of ethylene propylene diene monomer, 17% of calcium carbonate, 18% of talcum powder and 22% of magnesium oxide.
Further, the power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 20.5 percent of chlorinated polyethylene, 19.5 percent of POE, 8 percent of calcium carbonate, 15 percent of talcum powder, 20 percent of magnesium oxide and 15 percent of magnesium hydroxide.
In order to achieve the above object, according to a second aspect of the present invention, there is also provided a method for manufacturing the power line insulating layer with high water resistance.
According to the preparation method of the embodiment of the application, the raw material components are uniformly mixed in proportion, and the power cord insulating layer is prepared through injection molding and extrusion molding.
In order to achieve the above object, according to a third aspect of the present disclosure, there is also provided a method for rapidly detecting water resistance of the power line insulating layer.
According to the detection method of the embodiment of the application, the method comprises the following steps:
under the protection of nitrogen, raising the temperature of the power line insulating layer at a temperature rise speed of 20 ℃/min;
in the temperature rise process, testing the weight loss condition of the power line insulating layer, and drawing a weight loss curve;
obtaining the initial decomposition temperature and the weight loss of the power line insulating layer at each weight loss stage according to a weight loss curve;
and judging whether the weight loss amount of the weight loss stage with the decomposition starting temperature within the range of 410-450 ℃ is greater than a threshold value, and if so, determining that the water resistance of the power line insulating layer meets the requirement.
Further, the threshold is 28%.
The power cord insulating layer of high water proofness that provides in this application is through the key material composition of control power cord raw and other materials, solves the quality problem from the source, has effectually prevented that after sale power cord insulation resistance under the condition of soaking water from declining, withstand voltage decline, the electric wire that causes burns out, technical problem such as on fire.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flowchart of a method for detecting water resistance of a power line insulating layer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a weight loss curve according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but 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 application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Hereinafter, preferred embodiments of the present invention will be described in detail.
Embodiment 1: power line insulating layer with high water resistance
The existing power line consists of three parts, namely a conductor, an insulating layer and a sheath. When used outdoors, water may enter between the sheath and the insulating layer, and therefore, the water resistance of the insulating layer is strongly correlated with the safety of the power cord. And the main factor affecting the water resistance of the insulating layer is the material composition of the insulating layer. According to the embodiment of the invention, the key components and the proportion of the materials are determined by carrying out correlation research on the product material composition and the boiling resistance.
The power cord insulating layer material provided by the embodiment mainly comprises rubber materials, a filler, a plasticizer, a flame retardant and the like, wherein the common rubber materials comprise polyvinyl chloride (PVC), Chlorinated Polyethylene (CPE), Ethylene Propylene Diene Monomer (EPDM), Ethylene Propylene Monomer (EPM), modified ethylene propylene monomer (POE) and the like, and the applicant researches and discovers that the type and the proportion of the rubber materials are main factors influencing the water resistance of the power cord insulating layer. The sizing material has high proportion and good water resistance. The total amount of the formula is 100 parts, and the contribution values of each part of different sizing materials to the water resistance of the insulating layer are different, and the specific values are as follows:
| sizing material | PVC | CPE | EPDM | EPM | POE |
| Contribution value of water resistance of each sizing material | 0.3 | 0.5 | 1 | 1 | 1 |
To achieve good water resistance, the water resistance contribution of the compound must be above 28, preferably 30. From the above results, the following conclusions can be drawn: by taking the total weight of the raw materials of the power cord insulating layer as raw materials, the content of polyvinyl chloride is a%, the content of chlorinated polyethylene is b%, the content of ethylene propylene diene monomer is c%, the content of ethylene propylene diene monomer is d%, and the content of POE is e%, when the condition that 0.3a +0.5b + c + d + e is more than or equal to 28 is met, the water resistance of the power cord insulating layer is good, preferably, 0.3a +0.5b + c + d + e is more than or equal to 30, and the water resistance can obtain a better effect.
Embodiment 2: method for rapidly detecting water resistance of power line insulating layer with high water resistance
After the production of the power line insulating layer is finished, a water soaking test or a water boiling test is needed for verifying the water resistance of the power line insulating layer, the period is long, and the power line insulating layer cannot be used for monitoring the quality of incoming goods. Through the correlation verification of the results of the water boiling test and the insulating layer thermogravimetric test, the applicant finds that the water resistance of the material can be rapidly judged through the results of the thermogravimetric test. The main method comprises the following steps:
under the protection of nitrogen, raising the temperature of the power line insulating layer at a temperature rise speed of 20 ℃/min;
in the temperature rise process, testing the weight loss condition of the power line insulating layer, and drawing a weight loss curve;
obtaining the initial decomposition temperature and the weight loss of the power line insulating layer at each weight loss stage according to a weight loss curve;
and judging whether the weight loss amount of the weight loss stage with the decomposition starting temperature within the range of 410-450 ℃ is greater than a threshold value, and if so, determining that the water resistance of the power line insulating layer meets the requirement.
When the threshold value is determined to be 28%, namely the weight loss is more than 28%, the electric insulation performance of the power line insulation layer can still meet the national standard after the power line insulation layer is boiled in water at 60 ℃ for 400 hours. Preferably, when the threshold is determined to be 30, the water resistance verification reliability is higher.
The present application will be described in detail below with reference to preferred embodiments.
Example 1
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 17% chlorinated polyethylene, 24% ethylene propylene rubber, 12% calcium carbonate, 18% talc, 27% magnesium oxide and 2% dioctyl terephthalate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Example 2
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 15% of polyvinyl chloride, 26% of ethylene propylene diene monomer, 17% of calcium carbonate, 18% of talcum powder, 22% of magnesium oxide and 2% of trioctyl trimellitate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Example 3
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 20.5% of chlorinated polyethylene, 19.5% of POE, 8% of calcium carbonate, 15% of talcum powder, 20% of magnesium oxide, 15% of magnesium hydroxide and 2% of dioctyl adipate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Example 4
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 18% polyvinyl chloride, 24% ethylene propylene diene monomer, 16% calcium carbonate, 18% talc, 22% magnesium oxide and 2% dioctyl terephthalate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Example 5
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 15% of polyvinyl chloride, 17% of ethylene propylene diene monomer, 5% of POE, 20% of calcium carbonate, 15% of talcum powder, 20% of magnesium hydroxide, 2% of dioctyl terephthalate and 1% of dioctyl adipate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Example 6
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 22% of polyvinyl chloride, 10% of ethylene propylene diene monomer, 5% of ethylene propylene diene monomer, 8% of POE, 20% of calcium carbonate, 20% of talcum powder and 15% of magnesium hydroxide. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Example 7
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 22% of polyvinyl chloride, 14% of ethylene propylene diene monomer, 13% of ethylene propylene diene monomer, 12% of calcium carbonate, 22% of talcum powder, 12% of magnesium oxide and 5% of dioctyl adipate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Example 8
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 22% of polyvinyl chloride, 10% of ethylene propylene rubber, 17% of POE, 20% of calcium carbonate, 14% of talcum powder, 12% of magnesium hydroxide, 3% of dioctyl adipate and 2% of trioctyl trimellitate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Example 9
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 16% of chlorinated polyethylene, 18% of ethylene propylene rubber, 20% of calcium carbonate, 31% of talcum powder, 5% of magnesium oxide, 5% of magnesium hydroxide, 3% of dioctyl terephthalate, 1% of trioctyl trimellitate and 1% of dioctyl adipate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Example 10
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 20% chlorinated polyethylene, 10% ethylene-propylene-diene monomer, 13% ethylene-propylene-diene monomer, 12% calcium carbonate, 20% talc, 13% magnesium oxide, 8% magnesium hydroxide and 4% dioctyl terephthalate. And (3) fully and uniformly mixing the raw material components, and then carrying out injection molding and extrusion molding to obtain the power cord insulating layer.
Example 11
The power line insulating layer with high water resistance comprises the following raw material components in parts by weight: 21% of chlorinated polyethylene, 23% of POE, 20% of calcium carbonate, 20% of talcum powder, 5% of magnesium oxide, 6% of magnesium hydroxide and 5% of trioctyl trimellitate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Comparative example 1
The power line insulating layer comprises the following raw material components in parts by weight: 17% of chlorinated polyethylene, 18% of ethylene propylene diene monomer, 10% of calcium carbonate, 23% of talcum powder, 30% of magnesium oxide and 2% of trioctyl trimellitate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Comparative example 2
The power line insulating layer comprises the following raw material components in parts by weight: 20.5 percent of chlorinated polyethylene, 17.5 percent of POE, 10 percent of calcium carbonate, 15 percent of talcum powder, 20 percent of magnesium oxide, 15 percent of magnesium oxide and 2 percent of dioctyl adipate. The power cord insulating layer is prepared by fully and uniformly mixing the raw material components and performing injection molding and extrusion molding.
Test example 1: boiling test
Whether the water resistance of the power line insulating layer is qualified or not is judged through a boiling test, and the specific test method comprises the following steps: the power cord insulation layers of examples 1-11 and comparative examples 1-2 were placed in water at 60 ℃ and boiled in water for 400 hours. Then, continuously applying 500V direct current voltage for 1 minute to the power line insulating layer to detect whether the power line insulating layer is broken down; if the power line insulating layer is broken down, determining that the insulating property of the power line insulating layer does not meet the preset requirement and the water resistance is unqualified; and if the power line insulating layer is not broken down, determining that the insulating property of the power line insulating layer meets the preset requirement and the water resistance is qualified. The test results are reported in table 1.
Test example 2: weight loss detection test
The power supply line insulating layers of examples 1 to 11 and comparative examples 1 to 2 were treated as follows:
Under the protection of nitrogen, raising the temperature of the power line insulating layer at a temperature rise speed of 20 ℃/min; in the temperature rise process, testing the weight loss condition of the power line insulating layer, and drawing a weight loss curve; obtaining the initial decomposition temperature and the weight loss of the power line insulating layer at each weight loss stage according to a weight loss curve; and judging the weight loss amount of the weight loss stage with the decomposition starting temperature within the range of 410-450 ℃. The results of the tests are reported in table 1.
As can be seen from table 1, examples 1 to 8, 10 and 11 of the present application fundamentally solve the technical problem of poor water resistance of the insulating layer of the power cord in the prior art by controlling the key material composition of the raw materials of the power cord.
TABLE 1 Water boiling test and weightlessness test results recording table
Example 12
As can be seen from the data in table 1, when the weight loss amount of the weight loss stage corresponding to the initial point of weakness of 410 ℃ to 450 ℃ is greater than 28%, the test results of the poaching test are all qualified, and after multiple times of test verification, the method for rapidly detecting the water resistance of the power line insulating layer is provided in the embodiment.
As shown in the figure, the method for rapidly detecting the water resistance of the power line insulating layer in the embodiment includes the following steps:
S1, under the protection of nitrogen, raising the temperature of a power line insulating layer at a preset temperature rise speed;
specifically, in the present example, the temperature was raised from 35 ℃ at a temperature raising rate of 20 ℃ per minute until the temperature was raised to 800 ℃ and stopped.
S2, in the temperature rising process, testing the weight loss condition of the power line insulating layer to form a weight loss curve;
specifically, in the embodiment of the application, the quality of the power line insulating layer is measured at different temperatures to obtain the weight loss condition of the power line insulating layer, and a weight loss curve is drawn according to the change relationship between the weight loss condition and the temperature.
S3, obtaining the initial decomposition temperature and the weight loss of the power line insulating layer at each weight loss stage according to a weight loss curve;
specifically, taking fig. 2 as an example, there are four weight loss stages, and the initial weight loss temperature and the corresponding weight loss amount of each weight loss stage are respectively:
the initial weight loss temperature of the first weight loss stage is 265 ℃, and the corresponding weight loss amount is 10.82%;
the initial weight loss temperature of the second weight loss stage is 448.9 ℃, and the corresponding weight loss amount is 23.60%;
the initial weight loss temperature of the third weight loss stage is 553.9 ℃, and the corresponding weight loss amount is 6.65%; the initial weight loss temperature of the fourth weight loss stage was 670.7 ℃, corresponding to a weight loss of 13.27%.
S4, judging whether the weight loss of the weight loss stage of the decomposition starting temperature in the preset temperature range is larger than a threshold value, and if so, determining that the water resistance of the power line insulating layer meets the requirement;
if the weight loss amount of the weight loss stage when the decomposition starting temperature is within the preset temperature range is not more than the threshold value, carrying out a boiling test or long-term water soaking simulation on the power line insulating layer;
after a boiling test or a long-term water soaking simulation, detecting the insulating property of the power line insulating layer;
if the insulating property of the power line insulating layer can meet a preset requirement, determining that the water resistance of the power line insulating layer meets the requirement;
and if the insulating property of the power line insulating layer cannot meet the preset requirement, determining that the water resistance of the power line insulating layer does not meet the requirement.
Specifically, in the embodiment of the present application, the boiling test includes:
and putting the power line insulating layer into water with the temperature of 60 ℃, and boiling the water for 400 hours.
Specifically, in the embodiment of the present application, the insulation performance of the power line insulation layer is detected by the following method:
continuously applying a 500V direct current voltage to the power line insulating layer for 1 minute;
detecting whether the power line insulating layer is broken down;
If the power line insulating layer is broken down, determining that the insulating performance of the power line insulating layer does not meet the preset requirement;
and if the power line insulating layer is not broken down, determining that the insulating performance of the power line insulating layer meets the preset requirement.
Specifically, in the embodiment of the present application, the preset temperature range is: between 410 ℃ and 450 ℃, the threshold value is 28%, preferably 30%, and more accurate test results can be obtained.
In the second weight loss stage shown in fig. 2, the initial weight loss temperature of the second weight loss stage is 448.9 ℃, and the corresponding weight loss amount is 23.60%, 23.60% is less than 28%, so that the water resistance of the power line insulating layer can be determined only after a water boiling test or a long-term water soaking simulation is performed on the power line insulating layer.
Compared with the prior art, the water resistance detection method for the power line insulating layer provided by the embodiment of the invention has the advantages that the weight loss curve is obtained by detecting the weight loss conditions of the power line insulating layer at different temperatures, the initial decomposition temperature and the weight loss amount of the power line insulating layer at each weight loss stage are determined according to the weight loss curve, and the water resistance of the power line insulating layer is determined to be qualified when the weight loss amount of the power line insulating layer at the initial decomposition temperature within the preset range is greater than the threshold value.
Some embodiments in this specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A quick detection method for a power line insulating layer with high water resistance is characterized by comprising the following steps:
the power cord insulating layer is prepared by uniformly mixing the raw material components in proportion and performing injection molding and extrusion molding, wherein the raw material components comprise a sizing material, a filler, a plasticizer and a flame retardant, and the power cord insulating layer is characterized in that the sizing material comprises at least one of polyvinyl chloride, chlorinated polyethylene, ethylene propylene diene monomer and POE, wherein based on the total weight of the raw material components of the power cord insulating layer, the content of the polyvinyl chloride is a%, the content of the chlorinated polyethylene is b%, the content of the ethylene propylene diene monomer is c%, the content of the ethylene propylene diene monomer is d%, the content of the POE is e%, and the content of 0.3a +0.5b + c + d + e is more than or equal to 28;
Under the protection of nitrogen, raising the temperature of the power line insulating layer at a temperature rise speed of 20 ℃/min;
in the temperature rise process, testing the weight loss condition of the power line insulating layer, and drawing a weight loss curve;
obtaining the initial decomposition temperature and the weight loss of the power line insulating layer at each weight loss stage according to a weight loss curve;
judging whether the weight loss of the weight loss stage with the decomposition starting temperature within the range of 410-450 ℃ is greater than 28%, if so, determining that the water resistance of the power line insulating layer meets the requirement, and if not, performing a water boiling test or long-term water soaking simulation on the power line insulating layer.
2. The method for rapidly detecting the power line insulating layer with high water resistance according to claim 1, wherein 0.3a +0.5b + c + d + e is equal to or greater than 30.
3. The method for rapidly inspecting an insulating layer of a power cord having high water resistance according to claim 1, wherein the filler includes at least one of calcium carbonate and talc.
4. The method for rapidly inspecting an insulating layer of a power cord having high water resistance according to claim 1, wherein the flame retardant includes at least one of calcium carbonate and talc.
5. The method for rapidly inspecting an insulating layer of a power line having high water resistance according to claim 1, wherein the plasticizer includes at least one of dioctyl terephthalate, trioctyl trimellitate, and dioctyl adipate.
6. The method for rapidly detecting the power line insulating layer with high water resistance of claim 1, wherein the power line insulating layer comprises the following raw material components in parts by weight: 15 to 22 percent of polyvinyl chloride, 23 to 27 percent of ethylene propylene diene monomer, the mixture of ethylene propylene diene monomer and POE, 12 to 20 percent of calcium carbonate, 25 to 35 percent of talcum powder, the mixture of magnesium oxide and magnesium hydroxide, and 0 to 5 percent of dioctyl terephthalate, trioctyl trimellitate and dioctyl adipate.
7. The method for rapidly detecting the power line insulating layer with high water resistance of claim 1, wherein the power line insulating layer comprises the following raw material components in parts by weight: 16 to 20 percent of chlorinated polyethylene, 18 to 23 percent of mixture of ethylene propylene diene monomer, ethylene propylene diene monomer and POE, 12 to 20 percent of calcium carbonate, 31 to 41 percent of mixture of talcum powder, magnesium oxide and magnesium hydroxide, and 0 to 5 percent of mixture of dioctyl terephthalate, trioctyl trimellitate and dioctyl adipate.
8. The method for rapidly detecting the power line insulating layer with high water resistance of claim 1, wherein the power line insulating layer comprises the following raw material components in parts by weight: 17% of chlorinated polyethylene, 24% of ethylene propylene rubber, 12% of calcium carbonate, 18% of talcum powder and 27% of magnesium oxide.
9. The method for rapidly detecting the power line insulating layer with high water resistance of claim 1, wherein the power line insulating layer comprises the following raw material components in parts by weight: 15% of polyvinyl chloride, 26% of ethylene propylene diene monomer, 17% of calcium carbonate, 18% of talcum powder and 22% of magnesium oxide.
10. The method for rapidly detecting the power line insulating layer with high water resistance of claim 1, wherein the power line insulating layer comprises the following raw material components in parts by weight: 20.5 percent of chlorinated polyethylene, 19.5 percent of POE, 8 percent of calcium carbonate, 15 percent of talcum powder, 20 percent of magnesium oxide and 15 percent of magnesium hydroxide.
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