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Method for measuring crosslink density of elastomer

A cross-linking density and elastomer technology, which is applied in the analysis of nuclear magnetic resonance, can solve the problems of cross-linking density difference, poor correlation between cross-linking density and mechanical properties, and achieve the effect of improving accuracy and precision

Active Publication Date: 2017-06-09
SHANGHAI NIUMAI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the CPMG sequence, when the echo time is different, there is a significant difference in the measured cross-link density, and the correlation between the cross-link density measured by this sequence and the mechanical properties is poor

Method used

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  • Method for measuring crosslink density of elastomer
  • Method for measuring crosslink density of elastomer
  • Method for measuring crosslink density of elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Measuring the crosslink density of Thai standard gum

[0036] (1) Preparation of vulcanized rubber

[0037] The rubber is selected as Thai standard rubber, and the raw rubber is plasticized on the XK-250 open mill (Shanghai Rubber Machinery No. Black, finally add sulfur of different components, make a triangular bag, park it for 4 hours, and vulcanize it with an XLB-D flat vulcanizer (Huzhou Shunli Rubber Machinery Co., Ltd.). When the time is 5min, 7min, 8min and 10min, the rubbers with different degrees of vulcanization are taken out respectively. Cut the prepared fluidized rubber into strips of 0.1*0.1*1cm, wrap the three rubber strips with polytetrafluoroethylene for nuclear magnetic experiment

[0038] (2) Adopt nuclear magnetic resonance cross-linking density meter to detect cross-linking density

[0039] NMRC12-010V-T crosslinking density tester (Shanghai Numai Electronic Technology Co., Ltd.) was used to measure the nuclear magnetic parameters of the vulcaniz...

Embodiment 2

[0046] Others are identical with embodiment 1, and difference is the parameter of controlling nuclear magnetic resonance cross-linking densitometer: echo time is arranged from small to large, and echo time arrangement obeys logarithmic function, and the expression of logarithmic function is f(x )=a|log b x, the arrangement of the echo time is selected by changing the values ​​of a and b in the implementation. In this example, a=14.66, b=5, and the value of x is 1.01~1.39, increasing by 0.01 each time. For the arrangement of the specific echo time, see Table 1, the measured crosslink density is well correlated with the mechanical properties.

Embodiment 3

[0048] Others are identical with embodiment 1, and difference is the parameter of controlling nuclear magnetic resonance cross-linking density instrument: echo time is arranged from small to large, and echo time arrangement obeys exponential function, and the expression of exponential function is f (x)= a*b x In practice, the arrangement of echo times is selected by changing the value of a. In this example, a=0.05 and b=4. For the arrangement of specific echo times, see Table 1. The measured crosslink density is well correlated with mechanical properties.

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Abstract

The invention discloses a method for measuring the crosslink density of an elastomer. A magnetic resonance crosslink density spectrometer is utilized to detect magnetic resonance imaging decay curves, a CPMG sequence is adopted to acquire data, and the parameters of the magnetic resonance crosslink density spectrometer are controlled to be as follows: the echo time is arranged from small to large, and arrangement of the echo time complies with one of logarithmic functions, exponential functions, Gaussian distribution, logarithmic Gaussian distribution or Fibonacci sequence distribution. The method for measuring the crosslink density of the elastomer can improve the precision and the accuracy in magnetic resonance detection of the crosslink density of the elastomer.

Description

technical field [0001] The present invention relates to a method for measuring the crosslink density of elastomers. Background technique [0002] Polymer elastomer materials are one of the important basic industries of the national economy. Rubber is the most representative type of elastomer. In addition, there are many polymers with different elastic deformations, such as polyurethane elastomers, SBS elastomers, etc. . The cross-link density is the number of cross-link bonds in the cross-linked polymer. It is a very important physical quantity to evaluate the performance of elastomers. The higher the cross-link density, the better the mechanical strength and resilience. Therefore, the measurement of the crosslink density of elastomers is currently a matter of great concern in the industry. [0003] At present, the commonly used methods for measuring the crosslink density of elastomers include equilibrium swelling method, mechanical testing method and nuclear magnetic reso...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 姚叶峰杨培强高鹏飞杨翼
Owner SHANGHAI NIUMAI ELECTRONICS TECH
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