Preparation method for degrading waste leather scraps to be used as graphene oxide less-lamella dispersant

A waste dander, graphene technology, applied in chemical instruments and methods, dissolution, inorganic chemistry, etc., can solve the problems of poor dispersion uniformity and stability, simple process, low cost, high cost, and achieve process conditions, operation and process route. Reasonable and easy process conditions

Pending Publication Date: 2019-11-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method is mainly to treat it with ultrasonic and stirring. Such dispersion effect is short-lived and suitable for short-term application systems; the dispersant mainly used for intercalation dispersion intercalates and disperses graphene oxide, and dodecyl sulfonate is mainly used. Sodium citrate, sodium citrate, carboxymethyl chitosan and other anionic and cationic dispersants to form non-covalent intercalation complexes (Cai Yunan, Xu Chen, Sun Fengmei. Study on the dispersion of graphene in aqueous solution. Science and technology, 2014, (11): 220; Chen Yuanqing, Zhang Dawei, Gu Jiyou. Preparation and mechanical properties of functionalized graphene oxide / chitosan composite materials, Materials Heralds, 2015, 29 (6): 71-75; Xiong Xin, Wang Zhoufu , Ma Jing, et al. Research on rheological properties of graphene oxide dispersion. Artificial Crystal, 2013, 42 (5): 990-993), intercalation dispersion has the characteristics of simple process and low cost, but the formed graphene oxide In the dispersion system, there are mainly aggregates of few layers and multi-layers, and the uniformity and stability of the dispersion are poor.
The chemical graft modification method mainly forms a relatively stable graphene oxide dispersion system through the chemical reaction between the chemical group on the graphene oxide sheet and the substance containing the reactive chemical group, which can form a stable and uniform monolayer Dispersion system, when there are problems, the preparation process and process are complicated and the cost is high (Lai Changwei, Sun Ying, Yang Hong, etc. Functional modification of graphene and graphene oxide through "click chemistry". Acta Chemie Sinica, 2013, 71, 1201-1224)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Preparation of degraded waste dander dispersant:

[0050] Step 1, mix 200 parts of 3% sodium hydroxide solution and 30 parts of waste dander, stir and react at 80°C for 10 hours, then suction filter while it is hot, remove the filter residue, and the filtrate is an alkali-degraded waste dander solution ;

[0051] Step 2: Adjust 300 parts of the alkali-degraded waste dander solution obtained in the above step 1 to pH 10 with hydrochloric acid with a concentration of 2 mol / L, add 3 parts of alkaline protease, stir at 60°C for 3-4 hours, and cool down to Standby at room temperature;

[0052] Step 3, the degraded waste dander solution obtained in the above step 2 is dialyzed in deionized water to remove impurity ions, and the dialysis time is 12 hours each time, and then the deionized water is replaced to continue dialysis, and the dialysis is repeated 3 times like this. The pH value of the dialysate approaches 7 with the increase of dialysis time and times, and the f...

Embodiment 2

[0060] (1) Preparation of degraded waste dander dispersant:

[0061] Step 1, mix 300 parts of potassium hydroxide solution alkali solution with a mass fraction of 5% and 30 parts of waste dander, stir and react at 90°C for 10 hours, then suction filter while it is hot, remove the filter residue, and the filtrate is alkali-degraded waste dander chip solution;

[0062] Step 2: Adjust ~300 parts of the alkali-degraded waste dander solution obtained in the above step 1 to pH 11 with sulfuric acid at a concentration of 3 mol / L, add 5 parts of alkaline protease, stir at 60°C for 3-4 hours, and cool down to room temperature for later use;

[0063] Step 3, the degraded waste dander solution obtained in the above step 2 is dialyzed in deionized water to remove impurity ions, and the dialysis time is 12 hours each time, and then the deionized water is replaced to continue dialysis, and the dialysis is repeated 5 times like this. The pH value of the dialysate approaches 7 with the increa...

Embodiment 3

[0068] (1) Preparation of degraded waste dander dispersant:

[0069] Step 1: Mix 250 parts of calcium hydroxide solution alkali solution with a mass fraction of 5% and 28 parts of waste dander, stir and react at 80°C for 9 hours, then suction filter while it is hot, remove the filter residue, and the filtrate is alkali-degraded waste dander chip solution;

[0070] Step 2: Adjust 250 parts of the alkali-degraded waste dander solution obtained in the above step 1 to pH 10 with 2 mol / L acetic acid, add 4 parts of alkaline protease, stir at 55°C for 3.5 hours, cool down to room temperature for later use ;

[0071] Step 3, the degraded waste dander solution obtained in the above step 2 is dialyzed in deionized water to remove impurity ions, and the dialysis time is 12 hours each time, and then the deionized water is replaced to continue dialysis, so that the dialysis is repeated 4 times. The pH value of the dialysate approaches 7 with the increase of dialysis time and times, and ...

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Abstract

The invention discloses a preparation method for degrading waste leather scraps to be used as a graphene oxide less-lamella dispersant, and the preparation method comprises the following specific steps: firstly, respectively mixing the waste leather scraps with an alkali solution and alkali protease in sequence to carry out alkali degradation and enzyme degradation reaction to obtain a waste leather scrap degradation solution, and dialyzing the waste leather scrap degradation solution to degrade the waste leather scraps to prepare the graphene oxide less-lamella dispersant. The graphene oxideless-lamella dispersant is used in intercalation dispersion of carboxylated graphene oxide to prepare a graphene oxide less-lamella dispersant system, and the graphene oxide less-lamella dispersant system is subjected to freeze drying to obtain graphene oxide less- lamella powder. The preparation method has the advantages of easily available and cheap materials, simple and reasonable process, andthe product is used in the fields of reinforcement and toughening of adsorption materials, coatings with functions such as heat conduction, antistatic and corrosion prevention, polymers and cement-based composite materials and the like.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a preparation method for degrading waste dander as a graphene oxide few-lamellar dispersant. Background technique [0002] Waste dander is mainly small pieces of leather produced in the process of leather production and leather product manufacturing due to the process of trimming, slicing, smoothing, cutting samples, and grinding. There are about 1.4 million tons of waste dander produced in my country every year. Scraps are mainly disposed of through landfill, which not only pollutes the environment but also wastes resources. In recent years, the resource utilization of waste dander has been a hot issue of concern. At present, people use waste dander as a natural protein to prepare industrial gelatin, papermaking raw materials, leather retanning agents, foaming agents, emulsifiers, fertilizers, etc. (Ge Shuhua, Wang Quanjie, Diao Yi, Wang Xue, Yuan Yanluan. Re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198B01F17/00C09K23/00
CPCC01B32/198C09K23/017
Inventor 吕生华刘相刘雷鹏杨震郭子轶杨俊杰
Owner SHAANXI UNIV OF SCI & TECH
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