CN109116004B - Method for quantitatively representing dynamic energy loss density of vulcanized rubber by adopting RPA (resilient reactive powder) - Google Patents
Method for quantitatively representing dynamic energy loss density of vulcanized rubber by adopting RPA (resilient reactive powder) Download PDFInfo
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- CN109116004B CN109116004B CN201810994722.1A CN201810994722A CN109116004B CN 109116004 B CN109116004 B CN 109116004B CN 201810994722 A CN201810994722 A CN 201810994722A CN 109116004 B CN109116004 B CN 109116004B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/44—Resins; rubber; leather
- G01N33/445—Rubber
Abstract
The invention relates to a method for quantitatively representing dynamic energy loss density of vulcanized rubber by adopting RPA (resilient packet adhesive), wherein the energy loss density generated in a heat generation process is the ratio of the product of viscous torque and strain obtained in a strain scanning process to the volume of a rubber material in a mold cavity.
Description
Technical Field
The invention relates to a method for quantitatively representing dynamic energy loss density of vulcanized rubber by adopting RPA (resilient reactive powder adhesive), belonging to the technical field of rubber preparation.
Background
Rubber is a viscoelastic material that exhibits both elasticity and tack. In the field of tire formulation, the main means of viscoelastic test are DMA and RPA, which are generally used for the analysis and evaluation of rubber processability, and also for the evaluation of vulcanizate properties. The magnitude of the heat generation of the current formulation is mainly related by a 60 ℃ loss tangent factor tan delta ═ G '/G' (G '-shear loss modulus, G' -elastic storage modulus). This description has proved to have two drawbacks: (1) there is no theoretical basis. The formula is only an indirect description and is not narrowly derived. (2) The accuracy is poor. The same tan delta values can be obtained from different shear loss modulus and elastic storage modulus ratios. (3) the tan delta test result has a large error with the compression heat generation test result. (4) Belongs to qualitative analysis means.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method for quantitatively representing the dynamic energy loss density of vulcanized rubber by adopting RPA, which is efficient and accurate. According to the method, the dynamic heat generation of the formula is directly and quantitatively evaluated through data obtained by an RPA test platform and calculation of dynamic energy loss density. The method is suitable for qualitative quantity test of the heat generation of formulas at different positions of the tire.
The invention adopts the following technical scheme: a method for quantitatively characterizing the dynamic energy loss density of vulcanized rubber by adopting RPA (resilient Ring analysis), wherein the energy loss density is calculated by adopting the following formula
Wherein E' is loss energy density/J.m-3S' is viscosity torque/N.m, epsilon is strain/%, V is the volume of the die cavity sizing material, and the volume of the die cavity sizing material is a fixed value of 4.5cm3When the RPA rubber processing instrument is used for testing a sample, the sample is vulcanized, cooled and subjected to strain scanning for 3 processes, and S' is measured by the RPA rubber processing instrument in the strain scanning process.
Further, the vulcanization test conditions during the test of the RPA rubber processing instrument are as follows: the scanning frequency is 0.5-10Hz, the scanning strain is 0.5-50%, the vulcanization temperature is 150-170 ℃, and the vulcanization time is 5-20 minutes, so that the raw rubber is cured.
Furthermore, the strain scanning condition during the test of the RPA rubber processing instrument is that the frequency is 1-20Hz, the strain epsilon is 0.2-50%, and the corresponding viscous torque S' is obtained.
The characterization method provided by the invention is based on the classical mechanics theory, is simple and easy to implement, has high reliability of test data, can provide powerful data support for the research of rubber viscoelasticity, and can rapidly analyze the processing performance of a rubber production line in time.
Drawings
FIG. 1 is a vulcanization process of the present invention using an RPA rubber processor test.
FIG. 2 is a temperature reduction process of the present invention using an RPA rubber processor.
FIG. 3 is a strain sweep of the present invention using an RPA rubber processor test.
Detailed Description
Testing by using an RPA rubber processing instrument:
(1) and (3) vulcanizing and scanning a tread sample:
as shown in fig. 1, the scanning frequency is 1Hz, the scanning strain is 1%, and the vulcanization conditions are: 170 ℃ for 10 min;
(2) temperature scanning:
as shown in fig. 2, the scanning frequency is 1Hz, the scanning strain is 1%, the scanning temperature is: at 170 ℃ and 60 ℃;
(3) strain scanning:
as shown in fig. 3: the scanning temperature is 60 ℃, the scanning frequency is 1Hz, and the scanning strain is 0.2-20%; typically, the tread stock formulation has a deformation of around 5% and a torque S "at 5% strain of 2.31 dNm.
According to formula (1); e ″ -2.31 x 10-1*5％/4.5*10-6J·m-3＝2.57kJ·m-3。
Therefore, the tread rubber has a dynamic heat generation energy loss density of 2.57 kJ.m at 5% strain-3。
Claims (3)
1. A method for quantitatively characterizing the dynamic energy loss density of vulcanized rubber by adopting RPA is characterized by comprising the following steps: the energy loss density is calculated by the following formula
Wherein E' is loss energy density/J.m-3S' is viscosity torque/N.m, epsilon is strain/%, V is the volume of the die cavity sizing material, and the volume of the die cavity sizing material is a fixed value of 4.5cm3When the RPA rubber processing instrument is used for testing a sample, the sample is vulcanized, cooled and subjected to strain scanning for 3 processes, and S' is measured by the RPA rubber processing instrument in the strain scanning process.
2. The method for quantitatively characterizing the dynamic energy loss of vulcanized rubber according to claim 1, which is characterized in that: the vulcanization test conditions during the test of the RPA rubber processing instrument are as follows: the scanning frequency is 0.5-10Hz, the scanning strain is 0.5-50%, the vulcanization temperature is 150-170 ℃, and the vulcanization time is 5-20 minutes, so that the raw material rubber is vulcanized.
3. The method for quantitatively characterizing the dynamic energy loss of vulcanized rubber according to claim 1, which is characterized in that: the strain scanning condition when the RPA rubber processing instrument is used for testing is that the frequency is 1-20Hz, the strain epsilon is 0.2-50%, and the corresponding viscous torque S' is obtained.
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| CN110596359B (en) * | 2019-10-15 | 2020-08-25 | 中国热带农业科学院农产品加工研究所 | Method for judging raw rubber processing performance of natural rubber |
| CN113933179A (en) * | 2021-10-13 | 2022-01-14 | 中国科学院长春应用化学研究所 | Mechanical property prediction method for rubber material non-isothermal vulcanization |
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