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A kind of measuring method of cellulose fiber density

A technology for measuring cellulose fiber and density, which is applied in the direction of material analysis by observing sunken objects, etc. It can solve the problems of long measurement period, inability to measure the density of cellulose fiber, and the inability to accurately measure the density of cellulose fiber. The effect of shortening, reliable data and high precision

Active Publication Date: 2020-06-26
中联品检(北京)技术集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To sum up, in the prior art of fiber density measurement, the pycnometer method has been widely used in the actual fiber density test because of its simple operation, high data stability and high accuracy, but it has the disadvantages of long measurement period, inability to Accurate density determination of cellulose fibers with strong hygroscopicity cannot meet the needs of accurately determining the density of cellulose fibers in a short time

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  • A kind of measuring method of cellulose fiber density
  • A kind of measuring method of cellulose fiber density
  • A kind of measuring method of cellulose fiber density

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Experimental program
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Effect test

Embodiment 1

[0018] Step 1: Wash and dry the 50ml pycnometer. After the pycnometer is cooled to room temperature, add 4 / 5 of the volume of distilled water to the pycnometer. At the same time, take a beaker, add a small amount of distilled water, and then place the pycnometer filled with distilled water and the beaker are respectively placed in the vacuum device, set the vacuum degree to 0.1MPa, keep it for 0.5h, take it out, take the vacuumed distilled water from the beaker to fill up the pycnometer, and immediately measure the temperature of the distilled water as 10°C, look up the table and get The density ρ of distilled water at this time 1 =0.9997277g / cm 3 , and immediately weigh the total mass of the pycnometer and distilled water, and record it as m 1 =73.3064g;

[0019] Step 2: Take 0.5 g of kenaf fiber to be tested, first wash the fiber with distilled water to remove impurities on the fiber surface, then soak the fiber with absolute ethanol or acetone for 30 minutes, remove the o...

Embodiment 2

[0030] Step 1: Wash and dry the 50ml pycnometer. After the pycnometer is cooled to room temperature, add 4 / 5 of the volume of distilled water to the pycnometer. At the same time, take a beaker, add a small amount of distilled water, and then place the pycnometer filled with distilled water and the beaker are respectively placed in a vacuum device, set the vacuum degree to 0.1MPa, keep it for 0.5h, take it out, take the vacuumed distilled water from the beaker to fill up the pycnometer, immediately measure the temperature of the distilled water to be 10°C, check the table to get At this time the density of water ρ 1 =0.9997277g / cm 3 , and immediately weigh the total mass of the pycnometer and distilled water, and record it as m 1 =73.3064g;

[0031]Step 2: Take 0.5 g of kenaf fiber to be tested, first wash the fiber with distilled water to remove impurities on the fiber surface, then soak the fiber with absolute ethanol or acetone for 30 minutes, remove the oil agent on the f...

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Abstract

The invention relates to the field of cellulosic fiber density detection, in particular to a cellulosic fiber density measuring method. A pycnometer is adopted as a measuring container, distilled water serves as a measuring medium, and the density value of a cellulosic fiber is measured primarily in a short-time soaking mode; then, conversion is carried out by combining a fiber variety empirical coefficient, and the final density value of the cellulosic fiber is obtained. The fiber variety empirical coefficient is obtained in a mode that different varieties, different batches and different specifications of cellulosic fibers serve as objects of studies, first, the density value of the fiber of one fiber variety of different batches and different specifications is measured through a gas volume method, then, the primarily-measured cellulosic fiber density value is obtained through the pycnometer in a short-time soaking mode, and the specific value of the two values is the fiber variety empirical coefficient. The density value obtained through the cellulosic fiber density measuring method is basically consistent with a density value measured through a gas volume method, the proximity reaches 99% or above, and the cellulosic fiber density measuring method has the advantages that less time is consumed, operation is easy, precision is high and equipment requirements are low, and the method is suitable for measuring the density of the cellulosic fibers absorbing water easily.

Description

technical field [0001] The invention relates to the field of fiber density detection, and specifically discloses a method for measuring the density of cellulose fibers. Background technique [0002] Density is an important parameter to characterize the physical properties of fiber polymer materials. Determining the density of fiber materials and analyzing its variation rules are of great significance to the study of fiber structure and physical indicators. [0003] At present, the commonly used methods for measuring fiber density include density gradient tube method, liquid displacement method, pycnometer method and gas volume method. The density gradient tube method is suitable for natural fibers and some chemical fibers with low density, and has high accuracy, but the operation steps are cumbersome, and it is difficult to prepare a density gradient column with good linearity and reasonable density range; the liquid displacement method is simple and easy, and the measured v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N9/10
CPCG01N9/10
Inventor 王春红鹿超任子龙陈祯
Owner 中联品检(北京)技术集团有限公司