Method for detecting accessibility of plant fibers

A plant fiber and detection method technology, applied in the preparation of test samples, color/spectral characteristic measurement, instruments, etc., can solve the problems of large error in results, high toxicity, high cost, etc., and achieve simple and clear results, simple operation, low cost effect

Pending Publication Date: 2020-10-02
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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Problems solved by technology

The detection of plant fiber accessibility mainly includes chemical methods and physical methods. Chemical methods include: hydrolysis method, iodine absorption method, bromine absorption method, etc. Physical methods include: X-ray diffraction method, infrared spectroscopy, differential thermal Analytical methods, reverse chromatography, etc., have many shortcomings in the detection of fiber accessibility by chemical methods, such as: high toxicity, difficult recovery of chemical reagents, large error in results, etc. As far as current scientific research is concerned, many researchers no longer choose Measuring Fiber Accessibility Using Traditional Chemical Methods
The physical method is currently the most recognized method for testing fiber accessibility. It has the advantages of accurate results, short cycle time, and less pollution, but there are also some defects. What is directly detected is the proportion of the cellulose crystallized region transformed into an amorphous region, and indirectly reflects the size of the fiber accessibility, but cannot reflect the degree of fiber brooming

Method used

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  • Method for detecting accessibility of plant fibers
  • Method for detecting accessibility of plant fibers
  • Method for detecting accessibility of plant fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 0.5 to 8 m of Pondus fir was cut into 20 cm thick wood discs, the discs were pulverized through a shredder, and the pulverized wood samples were washed with distilled water and ground in a hammer mill until passing through a 2 cm sieve. Get the H of 1.5kg of the pond fir sawdust (dry weight 73.35%) that has been ground and 10% of the pond fir sample dry weight 2 o 2 solution, 8% NaOH solution by dry weight of plant samples, 1.5% NaOH by dry weight of plant samples 2 SiO 3 9H 2 O solution, 1.5% of the chelating agent diethyltriaminepentaacetic acid of the dry weight of the plant sample is mixed to form a plant sample with a mass ratio of 20%, and it is placed in an oven at 90°C for 1 hour. After the reaction, place it on a tray Refining in the mill and obtaining four different freeness samples of Pork cedar pulp, the resulting refined samples were depotentated with 100°C hot water, and screened in a sieving machine to finally obtain four different freeness The fiber ...

Embodiment 2

[0050] 0.5 to 8 m of Pondus fir was cut into 20 cm thick wood discs, the discs were pulverized through a shredder, and the pulverized wood samples were washed with distilled water and ground in a hammer mill until passing through a 2 cm sieve. Get the H of 1.5kg of the pond fir sawdust (dry weight 73.35%) that has been ground and 10% of the pond fir sample dry weight 2 o 2 solution, 13% NaOH solution by dry weight of plant samples, 1.5% NaOH by dry weight of plant samples 2 SiO 3 9H 2 O solution, 1.5% of the chelating agent diethyltriaminepentaacetic acid of the dry weight of the plant sample is mixed to form a plant sample with a mass ratio of 20%, and it is placed in an oven at 90°C for 1 hour. After the reaction, place it on a tray Refining in the mill and obtaining four different freeness samples of Pork cedar pulp, the resulting refined samples were depotentated with 100°C hot water, and screened in a sieving machine to finally obtain four different freeness The fiber...

Embodiment 3

[0052] 0.5 to 8 m of Pondus fir was cut into 20 cm thick wood discs, the discs were pulverized through a shredder, and the pulverized wood samples were washed with distilled water and ground in a hammer mill until passing through a 2 cm sieve. Get the ground pond fir sawdust (dry weight 73.35%) 1.5kg and 15% H of the pond fir sample dry weight 2 o 2 solution, 18% NaOH solution by dry weight of plant samples, 1.5% NaOH by dry weight of plant samples 2 SiO 3 9H 2 O solution, 1.5% of the chelating agent diethyltriaminepentaacetic acid of the dry weight of the plant sample is mixed to form a plant sample with a mass ratio of 20%, and it is placed in an oven at 90°C for 1 hour. After the reaction, place it on a tray Refining in the mill and obtaining four different freeness samples of pond cedar pulp, depotting the obtained refined samples with hot water at 100°C, and screening in a sieving machine to finally obtain four different freeness The fiber samples of pond cedar with h...

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Abstract

The invention discloses a method for detecting accessibility of plant fibers. The method comprises a contact area of fibers and accessibility of chemical reagents to the fibers. Plant fibers are usedas a raw material, a three-dimensional structure among lignin, hemicellulose and cellulose is cut off and crystalline regions of cellulose are broken by utilizing the reaction of chemical reagents including an H2O2 solution and a NaOH solution and lignin, therefore, the active group is exposed; a compact two-layer tissue structure of the plant fibers is broken by external mechanical force, thus, the fibers are broomed, and the fiber contact area and the pore size are increased; and finally, the contact area of the fibers and the accessibility of the chemical reagents to the fibers are judged by utilizing the strength of the binding force of macromolecular direct yellow and the Chicago sky blue 6B in a mixed coloring agent to the hydroxyl groups of the fibers. The method has the advantagesof simplicity in operation, no toxicity or harm, low cost and the like, and is a green and environment-friendly plant fiber accessibility detection method.

Description

technical field [0001] The invention relates to the technical field of plant fiber accessibility detection, in particular to a detection method of plant fiber accessibility and fiber contactable area with simple operation and accurate results. Background technique [0002] Every year, the high-value utilization rate of plants across the country is less than 50%, most of which are used as fuel, fertilizer, or even discarded directly. Therefore, the high value-added utilization of natural plant resources is particularly important, which not only solves the problem of resource It also avoids the pollution caused by low-value utilization to the environment. In recent years, with the increasing depletion and overuse of fossil resources, the use of natural plant fibers as a matrix to replace non-renewable resources to produce multifunctional composite materials has attracted the research interest of many researchers. The reason is mainly because the raw material natural fiber has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N15/00G01N1/30
CPCG01N21/25G01N1/30G01N15/00
Inventor 房桂干邹秀秀沈葵忠邓拥军韩善明梁龙焦健李红斌盘爱享张华兰施英乔丁来保梁芳敏田庆文王宝斌冉淼吴珽黄晨朱北平魏录录赵梦珂陈远航严振宇詹云妮
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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