CN107907746B - Method for testing polymer melt resistivity - Google Patents
Method for testing polymer melt resistivity Download PDFInfo
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- CN107907746B CN107907746B CN201711005193.XA CN201711005193A CN107907746B CN 107907746 B CN107907746 B CN 107907746B CN 201711005193 A CN201711005193 A CN 201711005193A CN 107907746 B CN107907746 B CN 107907746B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/22—Measuring resistance of fluids
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Abstract
The invention relates to a method for testing the polymer fusion resistivity, which comprises the steps of filling polymer melt in a hollow cavity with two open ends respectively covered by an electrode slice I and an electrode slice II, measuring the resistivity between the two electrode slices, wherein the electrode slice I and the electrode slice II are made of the same material, the hollow cavity is arranged in an insulating material, the open end covered by the electrode slice I is also covered by a conducting strip, the conducting strip is positioned below the electrode slice I and has a size smaller than that of the electrode slice I, and the conducting strip is provided with a plurality of air holes. The method for testing the polymer melt resistivity is simple and convenient to operate, has no special requirements on the polymer state, low testing requirements and high efficiency, can timely check and solve the phenomena of easy generation of bubbles, inaccurate filling and the like in the test, has high testing accuracy, good repeated operability and less polymer consumption in the test process, realizes quick and accurate measurement of the polymer resistivity, and has excellent economic value and popularization value.
Description
Technical Field
The invention belongs to the field of measurement, and particularly relates to a method for testing the melt resistivity of a polymer.
Background
The PET polymer not only has excellent mechanical property, chemical resistance, electrical insulation and air tightness, but also has the advantages of being not easy to break, non-toxic, odorless, easy to recycle and the like, so that the PET polymer is widely applied to various fields such as national defense, petroleum, electric appliances, medicines, packaging and the like. In practical application, for example, in flammable and explosive places and production, storage and transportation processes, the PET polymer is often required to have high insulating property and compressive strength, so that accidents such as electric leakage, breakdown and the like can be effectively avoided, and therefore, the resistance measurement of the PET polymer is very important, and the method has very important significance for guiding the adjustment of production process parameters.
In the prior art, a method for measuring the resistance of a PET sheet material generally adopts a cylindrical polytetrafluoroethylene round cup as a test container, a stainless steel plate as a positive electrode is lined in the round cup, a stainless steel bar is fixed at the center of a bottom plate of the round cup as a negative electrode, and then a resistance tester is used for connecting the positive electrode and the negative electrode, so that the aim of measuring the resistance of a PET melt in the round cup is fulfilled. The method is complex to operate, and phenomena of incomplete melt filling, bubbles and the like often exist in the measurement process of the PET melt resistance, so that the authenticity of a measurement result is greatly reduced. In addition, the method can only sample the ready-made PET melt, the demand for the PET melt is large, the measurement time is limited, the melt can be cooled and solidified after the measurement time is long, only the PET melt can be collected again, the resource waste is easy to cause, the fixed heating plate of the PET polymer is not easy to clean, the measurement speed and the measurement result accuracy cannot be guaranteed, the measurement repeatability is poor, the positive electrode and the negative electrode have potential risks of damage, and if a plurality of samples are detected at one time, the measurement can be completed in a long time, so that the traditional measurement method of the polymer resistance cannot meet the requirements of people in industrial production activities, and the continuity and the safety of the whole industrial production activity are further influenced.
Therefore, it is desired to develop a method for testing the melt resistivity of a polymer, which is easy and convenient to operate, has high testing accuracy and high efficiency.
Disclosure of Invention
The invention aims to overcome the defects of complex operation, low test accuracy and low efficiency of the polymer resistance test method in the prior art, thereby providing the polymer melt resistivity test method which is simple and convenient to operate, high in test accuracy and high in efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for testing the polymer melt resistivity comprises the steps of filling polymer melts into hollow cavities with two open ends respectively covered by an electrode slice I and an electrode slice II, and measuring the resistivity between the two electrode slices; the electrode plate I and the electrode plate II are made of the same material, the hollow cavity is arranged in the insulating material, and the electrode plate I and the electrode plate II are made of the same material, so that the difference of conductivity among different materials is avoided; the measuring cavity can be different in size and shape, but the requirement of covering the measuring cavity is met, and the condition that the melt cannot overflow the periphery of the electrode plate to influence the measurement is met; the proposal is set to be the same thickness, thereby being convenient for use and operation; the material surrounding the hollow cavity must be insulated, and if the material surrounding the hollow cavity is not insulated, the test method is not established, and the result comparison cannot be performed by using a deduction method.
As a preferred technical scheme:
according to the method for testing the polymer melt resistivity, the opening end covered by the electrode plate I is also covered by the conducting sheet, the conducting sheet is located below the electrode plate I and smaller than the electrode plate I in size, and the conducting sheet is provided with the plurality of air holes so as to facilitate the discharge of gas in a cavity in a polymer melt state.
The method for testing the melt resistivity of the polymer comprises the following specific testing steps:
(1) fixing the electrode plate II and covering the electrode plate II at one opening end of a hollow cavity in the test board, wherein the fixing purpose is to prevent the polymer from flowing after being heated and melted to cause the displacement of the electrode plate II, so that the polymer flows out or the upper aluminum foil and the lower aluminum foil contact short circuit to influence the measurement;
(2) heating a test board, and adding polymer slices into the hollow cavity to be tightly and uniformly arranged in the hollow cavity until the hollow cavity is filled with polymer melt, wherein the heating temperature is higher than the melting point of the polymer and lower than the melting point of the test board;
(3) covering the conductive sheet at the other opening end of the hollow cavity, pressing to remove air between the conductive sheet and the polymer melt, and then placing the electrode sheet I on the conductive sheet;
(4) carrying out resistance test after keeping the temperature for a period of time;
(5) observing the bubble or overflow amount after cooling the polymer melt, and if the bubble or overflow amount exceeds a set value, adjusting the arrangement density of the polymer slices in the hollow cavity and the number and the size of the air holes on the conductive sheet and then carrying out experiments again; otherwise, parallel experiments were performed.
A method for testing the melt resistivity of a polymer as described above, wherein the polymer is PET, and the mass of the polymer chip is 0.6g to the nearest 0.0001 g.
According to the method for testing the polymer melt resistivity, the test plate is a rectangular plate, the thickness of the test plate is 20mm, the length of the test plate is 150mm, and the width of the test plate is 50 mm; the test board is made of polytetrafluoroethylene; the hollow cavity is a cavity with a square bottom surface, the depth of the cavity is 2mm, the side length of the square is 15mm, hollow cavities and test boards with different sizes can be selected according to the actual requirements of tested polymers, the sizes of the test boards and the hollow cavities are set to be related to the content of conductive materials in the tested polymers, and the sizes and the thicknesses of corresponding electrode plates I, electrode plates II and conductive sheets are also reset to meet the requirements.
According to the method for testing the polymer melt resistivity, the electrode plate I, the electrode plate II and the conducting strip are all made of aluminum foil.
According to the method for testing the polymer melt resistivity, the electrode plate II is a square with the side length less than or equal to 50mm and the thickness of 2 mm; the conducting plate is a square with the side length less than or equal to 40mm and the thickness of 2 mm; electrode slice I is the square that the length of a side is less than or equal to 50mm, and thickness is 2mm, and electrode slice I, II and the shape and size of conducting strip etc. all can select according to actual demand, as long as can ensure to cover cavity opening in completely can, electrode slice I, II and conducting strip thickness can set up according to actual demand, can be different, conducting strip thickness conveniently perforates the use can.
According to the method for testing the polymer melt resistivity, the electrode plate II is fixed on the test board through the aluminum foil adhesive tape, and the aluminum foil adhesive tape is a square adhesive tape with the side length of the self-adhesive surface on the aluminum foil surface being less than or equal to 50 mm.
According to the method for testing the melt resistivity of the polymer, the heating temperature is 285 ℃, the heat preservation temperature is 285 ℃, and the heat preservation time is 3 min.
According to the method for testing the polymer melt resistivity, a multimeter is adopted for resistance testing, and the specific testing method is as follows: adjusting a knob of the resistance tester to a test gear, adjusting the universal meter to an ohmic gear, keeping the temperature for 1 minute, stabilizing the temperature at 285 +/-1 ℃, observing the reading of the universal meter, recording a measured value after the value is stabilized, and if OL occurs in the measurement process, indicating that the measured value exceeds the range or the short circuit condition exists on the measurement plate surface, and measuring after the problem needs to be eliminated.
Has the advantages that:
(1) the method for testing the polymer melt resistivity is simple and convenient to operate, has no special requirements on the polymer state, and is low in testing requirement and high in efficiency;
(2) the method for testing the polymer melt resistivity can timely check and solve the phenomena of bubbles, infilled filling and the like easily generated in the test, has high test accuracy, good repeated operability and less polymer consumed in the test process, realizes the rapid and accurate measurement of the polymer resistivity, and has extremely good economic value and popularization value.
Drawings
FIG. 1 is a schematic test diagram of the method of the present invention;
the test board comprises 1-electrode slice I, 2-test board, 3-conducting strip, 4-hollow cavity and 5-electrode slice II.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
A testing method of PET melt resistivity is shown in a testing schematic diagram in figure 1, and comprises the following specific testing steps:
(1) fixing an electrode plate II 5 through an aluminum foil adhesive tape and covering an opening end of a hollow cavity 4 in a test board 2, wherein the test board 2 is a rectangular board, the thickness is 20mm, the length is 150mm, the width is 50mm, the test board 2 is made of polytetrafluoroethylene, the hollow cavity 4 is a cavity with a square bottom surface, the depth of the cavity is 2mm, the side length of the square is 15mm, the electrode plate II 5 is a square with the side length of 50mm, the thickness is 2mm, and the aluminum foil adhesive tape is a square adhesive tape with the side length of 50 mm;
(2) heating the test board 2, and adding the PET slices into the hollow cavity 4 until the hollow cavity 4 is filled with the PET melt, wherein the heating temperature is 285 ℃, and the mass of the PET slices is 0.6g, and the accuracy is 0.0001 g;
(3) covering a conducting strip 3 at the other opening end of the hollow cavity 4, pressing to remove air between the conducting strip 3 and the PET melt, and then placing an electrode slice I1 on the conducting strip 3, wherein the conducting strip 3 is provided with 20 air holes, the electrode slice I1, the electrode slice II 5 and the conducting strip 3 are all aluminum foils, the conducting strip 3 is a square with the side length of 40mm and the thickness of 2mm, and the electrode slice I1 is a square with the side length of 50mm and the thickness of 2 mm;
(4) keeping the temperature at 285 ℃ for 3min, adjusting a knob of the resistance tester to a test gear, adjusting a universal meter to an ohmic gear, keeping the temperature stable at 285 +/-1 ℃ within 1 min, observing the reading of the universal meter, and recording a measured value after the value is stable;
(5) observing bubbles or overflow amount after cooling the PET melt, and carrying out experiments again after adjusting the arrangement density of the PET slices in the hollow cavity 4 and the number and the size of the air holes on the conducting strip 3 if the arrangement density exceeds a set value; otherwise, parallel experiments were performed.
Through inspection, the test method is simple and convenient to operate, has no special requirements on the state of the polymer, has low test requirements and high efficiency, can timely eliminate and solve the phenomena of easy generation of bubbles, incomplete filling and the like in the test, has high test accuracy, good repeated operability, consumes less polymer in the test process, and is economic and environment-friendly.
Example 2
A testing method of PET melt resistivity is shown in a testing schematic diagram in figure 1, and comprises the following specific testing steps:
(1) fixing an electrode plate II 5 through an aluminum foil adhesive tape and covering an opening end of a hollow cavity 4 in a test board 2, wherein the test board 2 is a rectangular board, the thickness is 20mm, the length is 150mm, the width is 50mm, the test board 2 is made of polytetrafluoroethylene, the hollow cavity 4 is a cavity with a square bottom surface, the depth of the cavity is 2mm, the side length of the square is 15mm, the electrode plate II 5 is a square with the side length of 45mm, the thickness is 2mm, and the aluminum foil adhesive tape is a square adhesive tape with the side length of 45 mm;
(2) heating the test board 2, and adding the PET slices into the hollow cavity 4 until the hollow cavity 4 is filled with the PET melt, wherein the heating temperature is 285 ℃, and the mass of the PET slices is 0.6g, and the accuracy is 0.0001 g;
(3) covering a conducting strip 3 at the other opening end of the hollow cavity 4, pressing to remove air between the conducting strip 3 and the PET melt, and then placing an electrode slice I1 on the conducting strip 3, wherein the conducting strip 3 is provided with 30 air holes, the electrode slice I1, the electrode slice II 5 and the conducting strip 3 are all aluminum foils, the conducting strip 3 is a square with the side length of 35mm and the thickness of 2mm, and the electrode slice I1 is a square with the side length of 45mm and the thickness of 2 mm;
(4) keeping the temperature at 285 ℃ for 3min, adjusting a knob of the resistance tester to a test gear, adjusting a universal meter to an ohmic gear, keeping the temperature stable at 285 +/-1 ℃ within 1 min, observing the reading of the universal meter, and recording a measured value after the value is stable;
(5) observing bubbles or overflow amount after cooling the PET melt, and carrying out experiments again after adjusting the arrangement density of the PET slices in the hollow cavity 4 and the number and the size of the air holes on the conducting strip 3 if the arrangement density exceeds a set value; otherwise, parallel experiments were performed.
Through inspection, the test method is simple and convenient to operate, has no special requirements on the state of the polymer, has low test requirements and high efficiency, can timely eliminate and solve the phenomena of easy generation of bubbles, incomplete filling and the like in the test, has high test accuracy, good repeated operability, consumes less polymer in the test process, and is economic and environment-friendly.
Claims (8)
1. A method for testing the melt resistivity of a polymer is characterized by comprising the following steps: filling polymer melt in a hollow cavity with two open ends respectively covered by an electrode slice I and an electrode slice II, and measuring the resistivity between the two electrode slices; the electrode plate I and the electrode plate II are made of the same material, and the hollow cavity is arranged in the insulating material;
the opening end covered by the electrode plate I is also covered by a conducting plate, the conducting plate is positioned below the electrode plate I and is smaller than the electrode plate I in size, and a plurality of air holes are formed in the conducting plate;
the testing steps are as follows:
(1) fixing and covering the electrode plate II on one opening end of a hollow cavity in the test board;
(2) heating the test board and adding the polymer slices into the hollow cavity until the hollow cavity is filled with the polymer melt, wherein the heating temperature is higher than the melting point of the polymer and lower than the melting point of the test board;
(3) covering the conductive sheet at the other opening end of the hollow cavity, pressing to remove air between the conductive sheet and the polymer melt, and then placing the electrode sheet I on the conductive sheet;
(4) carrying out resistance test after keeping the temperature for a period of time;
(5) observing the bubble or overflow amount after cooling the polymer melt, and if the bubble or overflow amount exceeds a set value, adjusting the arrangement density of the polymer slices in the hollow cavity and the number and the size of the air holes on the conductive sheet and then carrying out experiments again; otherwise, parallel experiments were performed.
2. The method of claim 1, wherein the polymer is PET and the polymer chip has a mass of 0.6g to the nearest 0.0001 g.
3. The method of claim 2, wherein the test board is a rectangular board having a thickness of 20mm, a length of 150mm and a width of 50 mm; the test board is made of polytetrafluoroethylene; the hollow cavity is a cavity with a square bottom surface, the depth of the cavity is 2mm, and the side length of the square is 15 mm.
4. The method as claimed in claim 3, wherein the electrode sheet I, the electrode sheet II and the conductive sheet are aluminum foil.
5. The method for testing the melt resistivity of the polymer as claimed in claim 4, wherein the electrode sheet II is a square with a side length of less than or equal to 50mm and a thickness of 2 mm; the conducting plate is a square with the side length less than or equal to 40mm and the thickness of 2 mm; the electrode slice I is a square with the side length less than or equal to 50mm and the thickness of 2 mm.
6. The method for testing the melt resistivity of the polymer as claimed in claim 5, wherein the electrode sheet II is fixed on the test board by an aluminum foil tape, and the aluminum foil tape is a square tape with a side length less than or equal to 50 mm.
7. The method for testing the melt resistivity of the polymer, according to claim 6, wherein the heating temperature is 285 ℃, the holding temperature is 285 ℃, and the holding time is 3 min.
8. The method for testing the melt resistivity of the polymer, according to claim 7, is characterized in that a multimeter is adopted for the resistance test, and the specific test method is as follows: and adjusting the knob of the resistance tester to a test gear, adjusting the universal meter to an ohmic gear, keeping the temperature for 1 minute, stabilizing the temperature at 285 +/-1 ℃, observing the reading of the universal meter, and recording the measured value after the value is stabilized.
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| CN1851485A (en) * | 2006-05-26 | 2006-10-25 | 中国科学院上海硅酸盐研究所 | High temperature resistivity measuring device and its measuring method |
| CN101782544B (en) * | 2010-03-02 | 2012-09-26 | 济南大学 | Device for testing metal melt electrical resistivity and testing method thereof |
| CN201945636U (en) * | 2010-12-24 | 2011-08-24 | 上海中兴派能能源科技有限公司 | Device for testing resistivity of lithium battery material |
| CN102636697B (en) * | 2012-05-11 | 2015-02-04 | 湘潭电机股份有限公司 | Device for dynamically measuring performance of insulating medium |
| CN103913635B (en) * | 2014-04-08 | 2015-07-15 | 中国人民解放军军械工程学院 | System for measuring surface resistivity of material on high-temperature condition |
| CN103969510B (en) * | 2014-05-15 | 2017-05-10 | 四川大学 | Dielectric constant measurement device |
| CN104391179B (en) * | 2014-12-16 | 2017-05-24 | 成都光明光电股份有限公司 | Conductivity test device and method for molten glass |
| CN106610453A (en) * | 2015-10-22 | 2017-05-03 | 眭志祥 | A high-temperature glass melt resistivity testing device |
| CN106885947A (en) * | 2017-03-06 | 2017-06-23 | 营口康辉石化有限公司 | A kind of resistance meter |
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| Title |
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| 熔融玻璃电阻率的测定;南京玻纤院物化室电化组;《玻璃纤维》;19771226;第11-13页 * |
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Address after: 115009 xianrendao energy and chemical industry zone, Yingkou City, Liaoning Province Patentee after: Kanghui New Material Technology Co.,Ltd. Address before: 115009 xianrendao energy and chemical industry zone, Yingkou City, Liaoning Province Patentee before: YINGKOU KANGHUI PETROCHEMICAL Co.,Ltd. |
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