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Method for measuring in-plane saturated permeability of natural fiber fabrics

A measurement method, natural fiber technology, applied in the direction of permeability/surface area analysis, measurement device, suspension and porous material analysis, etc., can solve the problem of different contact interface methods of resin in weaving mode

Active Publication Date: 2017-02-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The permeability of natural fiber fabrics is the key factor restricting the successful preparation of natural fiber composites by LCM technology. However, due to the obvious differences between natural fiber fabrics and synthetic fibers such as glass fibers, such as fabrics have different structures and different weaving methods. And different from the resin contact interface, there is no standard method for testing the saturation permeability of natural fiber fabrics in the world

Method used

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  • Method for measuring in-plane saturated permeability of natural fiber fabrics
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  • Method for measuring in-plane saturated permeability of natural fiber fabrics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Embodiment 1 The structure of the measuring device used in the measuring method of the present invention

[0093] Such as Figure 1-2 As shown, the measuring device mainly includes: a container 1, a miniature gear pump 2, a mold 3, a digital camera 4, a data acquisition card 5 and a computer 6. Among them, the container is used to hold the first test liquid and the second test liquid, and the mold 3 is composed of a cavity 31, a lower steel template 32, a steel upper template frame 33, a tempered glass upper template 34 and a heating pipe (not shown) . A glue injection port 35 is opened at the front end of the mold cavity 31, and a glue outlet 36 is opened on the left and right sides along the width direction at the rear end of the mold cavity 31. The diameters of the glue injection port and the glue outlet are both 5mm. The glue injection port 35 and the glue outlet 36 are respectively connected to the pipeline. There are 5 threaded holes 37 evenly distributed in the ...

Embodiment 2

[0094] Example 2 Determination of saturated permeability of jute fibers with different layers

[0095] Step 1: Selection and laying of samples to be tested

[0096] Set the areal density to 450g / m 2 The two-way woven jute fiber cloth is cut to match the size of the mold cavity (13cm*28cm); then the cut fibers are layered. The number of plies is 5, 6, and 7 respectively; the porosity of the jute fiber at different layers is calculated.

[0097] Install the sealing strip in the groove of the mold, cover the upper mold of transparent tempered glass, and add a steel upper template frame, fix the upper and lower templates with bolts, and add a gasket on the upper and lower bolts to ensure the tightness of the mold .

[0098] Step 2: Determine the in-plane saturated permeability of the sample to be tested in mineral oil

[0099] Add an appropriate amount of mineral oil (the viscosity is the same as the actual resin, 190mPa·s) in the container, and connect it to the micro gear pump with a pi...

Embodiment 3

[0107] Example 3 Determination of saturated permeability of jute fiber checkered cloth at different temperatures

[0108] Use jute fiber checkered cloth as the test object. Cut the fabric into 13*28cm 2 After laying 5 layers, using mineral oil and vinyl resin as test liquids respectively, measure the unidirectional saturated permeability in the fiber plane when the fiber volume fraction is 47.65%, and ensure the constant flow rate and control it at 200ml / min. The test temperature is 25°C, 35°C, and 45°C.

[0109] The saturated permeability of the natural fiber obtained from the test and the relationship between the saturated permeability and time are as shown in Table 2:

[0110] Table 2 Test results

[0111]

[0112] It can be seen from Table 2 that as the temperature rises, the slope of the relationship between saturated permeability and time increases, and saturated permeability decreases faster.

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Abstract

The invention relates to measurement methods for natural fiber fabric in-plane saturated permeability, and specifically discloses a measurement method, which comprises the steps of: (1) providing a fiber in-plane saturated permeability measurement device laid with a to-be-measured sample; (2) measuring and calculating the in-plane saturated permeability K0 of the to-be-measured sample when a first test solution fills a die cavity, with the first test solution not causing absorption expansion of the to-be-measured sample; (3) measuring and calculating the in-plane saturated permeability Kend of the to-be-measured sample when a second test solution fills the die cavity, and recording the time tend for filling the die by the second test solution, which causes absorption expansion of the to-be-measured sample; and (4) according to the formula K=K0-(K0-Kend) / tend*t, calculating the in-plane saturated permeability of the to-be-measured sample at different time, with the test solution(s) in step (2) and / or step (3) having constant flow. The measurement method provided by the invention can rapidly and accurately determine the saturated permeability of natural fiber fabrics, and has the characteristics of good repeatability of test data and numerical stability.

Description

Technical field [0001] The invention relates to the field of material testing, in particular to a method for measuring in-plane saturation permeability of natural fiber fabrics. Background technique [0002] Natural fiber composite materials have the advantages of low density, heat insulation, low price, rich resources, degradable, and renewable, which make their applications in the construction industry, transportation and other fields increasing day by day. In recent years, the liquid molding technology (LCM technology) of composite materials with high molding efficiency, low environmental pollution and low industrial cost has been mainly adopted at home and abroad to prepare high-performance natural fiber composite materials. The permeability of natural fiber fabrics is a key factor that restricts the success of LCM technology in preparing natural fiber composite materials. However, there are obvious differences between natural fiber fabrics and synthetic fibers such as glass ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 蔡晶祝颖丹秦永利滑聪孟令军范欣愉
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI