Preparation method and application of biodegradable cellulose paper taking lignin as adhesive

A technology for degrading cellulose and cellulose paper, applied in the direction of non-fibrous pulp addition, fiber raw material treatment, inorganic compound addition, etc., can solve problems such as poor water resistance, poor mechanical strength of plastic substitutes, unstable moisture content of cellulose paper, etc. , to achieve excellent wet strength, improved heat resistance and UV resistance, and good UV absorption

Pending Publication Date: 2022-02-08
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cellulose paper has the advantages of good biodegradability, abundant resources, large production scale, and low material cost, but is limited by its poor water resistance and poor mechanical strength of plastic alternatives
The main problems faced by cellulose paper include: 1. Hydrophilic hydroxyl groups naturally present on the surface of cellulose lead to unstable moisture content of cellulose paper; 2. Randomly distributed fibers and a large number of voids in cellulose paper limit this The mechanical properties of the material, cellulose paper has the advantages of good biodegradability, abundant resources, large production scale, and low material cost, but it is limited by its poor water resistance and poor mechanical strength of plastic substitutes

Method used

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  • Preparation method and application of biodegradable cellulose paper taking lignin as adhesive
  • Preparation method and application of biodegradable cellulose paper taking lignin as adhesive
  • Preparation method and application of biodegradable cellulose paper taking lignin as adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of biodegradable cellulose paper using lignin as binder:

[0041] (1) Cut the cellulose paper into 10×20cm 2 Swell the rectangle in 4% (w / w) sodium hydroxide aqueous solution for 2h, then soak in ethanol / water (1 / 1, v / v) for 30min to remove residual chemical substances, operate as above, use ethanol / water wash five times;

[0042] (2) Put the washed cellulose paper sample into dehydrated alcohol and soak for 30min, remove the water in the cellulose paper sample, and set aside;

[0043] (3) Disperse the alkali lignin in acetone, perform ultrasonic treatment, and then centrifuge the solution at 5000rpm for 10min to obtain a supernatant;

[0044] (4) seal and soak the puffed cellulose paper in 500mL of the above supernatant for 12 hours, evaporate the acetone at room temperature, fully penetrate the lignin solution with alkali lignin, and allow the lignin to cover the cellulose fibers;

[0045] (5) The cellulose-lignin material is then hot-pressed ...

Embodiment 2

[0047] Determination of lignin concentration:

[0048] Adopt the preparation method of above-mentioned embodiment 1, wherein the concentration of lignin in the supernatant obtained in step (3) is respectively set as 0%, 7%, 13%, 26%, 38%, 47%, and step (5) The medium hot pressing temperature was set at 100°C, and the properties of the materials prepared with different concentrations of lignin were tested respectively. The specific results are as follows: Figure 1-7 Shown:

[0049] Mechanical stability test: use Instron3367 material tensile testing machine to test the mechanical properties of lignin-cellulose samples. Cut the size of the tensile sample to 100mm×5mm×0.04mm, clamp both ends of the sample, and -1 The constant test speed is stretched along the length of the sample until it breaks, and the result is the average of the two measurements.

[0050] in figure 1 The ordinary cellulose paper and the lignin-cellulose composite paper with a lignin concentration of 26% i...

Embodiment 3

[0055] Determination of hot pressing temperature:

[0056] The concentration of lignin in the supernatant obtained in the above-mentioned embodiment 1 step (3) is set to 26%, and the hot-pressing temperature is set to 50°C, 100°C, 130°C, 150°C respectively in the step (5), and the remaining steps and implementation The same as Example 1, the mechanical strength of lignin-cellulose is detected under different hot-pressing temperatures, and the specific results are shown in Figure 8 , where it can be known that the mechanical strength is the best when the hot pressing temperature is 100-130°C.

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Abstract

The invention provides a preparation method and application of biodegradable cellulose paper with lignin as an adhesive, and relates to the technical field of cellulose paper processing. The preparation method of the cellulose paper mainly comprises the steps of swelling of the cellulose paper, pretreatment of lignin, mixing of the lignin and the cellulose paper, hot pressing and the like. The defects in the prior art are overcome, the mechanical strength of the cellulose paper is effectively improved, meanwhile, the water resistance of the cellulose paper is improved, the use range of the cellulose paper is widened, and the use value of the material is improved.

Description

technical field [0001] The invention relates to the technical field of cellulose paper processing, in particular to a preparation method and application of biodegradable cellulose paper using lignin as a binder. Background technique [0002] Composed of various synthetic or semi-synthetic petrochemical products, plastic waste poses a huge threat to the environment and human health due to disadvantages such as durability (non-biodegradable), low recycling rates, and poor waste management. Cellulose paper has shown great potential in plastic replacement due to its advantages such as abundant renewable resources, environmental friendliness, and biodegradability. [0003] Cellulose paper has the advantages of good biodegradability, abundant resources, large-scale production, and low material cost, but it is limited by its poor water resistance and poor mechanical strength of plastic alternatives. The main problems faced by cellulose paper include: 1. Hydrophilic hydroxyl groups...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/23D21H17/64D21H17/06D21H21/14D21H25/00D21H27/10C08L1/02C08L97/00H05K1/03
CPCD21H17/23D21H17/64D21H17/06D21H21/14D21H25/005D21H27/10C08L1/02H05K1/0386C08L2201/06C08L2201/08C08L97/005
Inventor 郭丹郡王宏勋胥伟易阳孙莹
Owner WUHAN POLYTECHNIC UNIVERSITY
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