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Method for detecting dispersibility of polymer SBS modified asphalt based on atomic force microscope

An atomic force microscope and modified asphalt technology, which is used in scanning probe microscopy, measuring devices, instruments, etc., can solve the problems of inaccurate detection method data and large error in detection results, so as to ensure the original morphology, dispersion and other problems. Accurate sex detection, simple and convenient preparation

Active Publication Date: 2019-06-25
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: Aiming at the problems and deficiencies in the prior art, the present invention provides a method for detecting polymer dispersion in SBS modified asphalt based on an atomic force microscope, which solves the problem that the data of the existing detection method is not accurate enough and the error of the detection result is relatively large

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  • Method for detecting dispersibility of polymer SBS modified asphalt based on atomic force microscope
  • Method for detecting dispersibility of polymer SBS modified asphalt based on atomic force microscope

Examples

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Embodiment 1

[0033] A kind of method based on atomic force microscope detection polymer dispersibility in SBS modified bitumen, comprises the steps:

[0034] (1) Pretreatment of SBS modified asphalt

[0035] (1-1) Put the SBS modified asphalt material to be tested into an oven, control the temperature of the oven at 160°C, and heat the SBS modified asphalt to soften it into a liquid state;

[0036] (1-2) Take out a small amount of softened SBS modified asphalt and spread it evenly on the glass sheet;

[0037] (2) Cryopreservation of SBS modified asphalt

[0038] (2-1) Wrap the obtained SBS modified asphalt sample with plastic wrap to achieve the effect of isolation and preservation;

[0039] (2-2) Put the wrapped sample into a liquid nitrogen vacuum freezer to freeze, and set the nitrogen concentration, freezing temperature and freezing time. The nitrogen protection concentration is 90±0.5%, and the freezing temperature is -40±5°C , freezing time 24h;

[0040] (3) Low temperature cutti...

Embodiment 2

[0052] The method of embodiment 2 and embodiment 1 is identical, and difference is: freezing time 20h in step (2-2); Cooling water is the pure water of-4 ℃ in step (3-1); Step (4-2) The elastic constant k is 30N / m, the resonance frequency is 300kHz and the scanning speed is 0.5Hz.

Embodiment 3

[0054] The method of embodiment 2 and embodiment 1 is identical, and difference is: freezing time 30h in the step (2-2); Cooling water is the pure water of-6 ℃ in the step (3-1); Step (4-2) The elastic constant k is 50N / m, the resonance frequency is 350kHz and the scanning speed is 5Hz.

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Abstract

The invention discloses a method for detecting dispersibility of a polymer in SBS modified asphalt based on an atomic force microscope. The method includes the following steps of: (1) the pretreatmentof the SBS modified asphalt; (2) the cryopreservation of the SBS modified asphalt; (3) the low-temperature cutting of the SBS modified asphalt; (4) the scanning of a SBS modified asphalt sample; and(5) topographical image and phase diagram observation to determine the degree of the dispersion of the polymer in the SBS modified asphalt. According to the method of the invention, nitrogen filling protection, liquid nitrogen rapid freezing and the tapping mode scanning of the SBS modified asphalt by the atomic force microscopy (AFM) are adopted, so that the three-dimensional topographic image and phase diagram of the surface of the SBS modified asphalt sample can be obtained directly. The method has the advantages of simple operation, no need for excessive processing of the sample, clear detection pictures, high detection accuracy, and higher applicability. With the method adopted, a new method and idea can be provided for studying the dispersibility of the polymer in the SBS modified asphalt.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a method for detecting polymer dispersion in SBS modified asphalt based on an atomic force microscope. Background technique [0002] SBS modified asphalt has significant effects in improving temperature sensitivity, improving low temperature toughness, anti-rutting ability and anti-fatigue cracking ability; because SBS modified asphalt can improve and improve the performance of road petroleum asphalt and prolong the use of asphalt pavement It has superior performance in life and other aspects, so it has been widely used in the construction of high-grade asphalt pavement. [0003] For SBS modified asphalt, the thermodynamic compatibility of asphalt and polymer is the key factor to determine its various properties. From a broad engineering level, compatibility means that the two substances are blended to form a stable system. The polymer Uniformly distributed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01Q30/20G01Q60/24
Inventor 刘圣洁缪岗辉刘云陈俊吴建涛
Owner HOHAI UNIV