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A kind of preparation method of NTAA modified cellulose film

A technology of cellulose film and microcrystalline cellulose, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc. question

Active Publication Date: 2020-10-23
北京国素生态科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of the cellulose film by this method needs to add a variety of drugs, and there are many processes, and the high temperature and high pressure environment of the reactor is not conducive to the expansion of production in the preparation process, and an open rubber mixing machine is required for the preparation of the cellulose film, which is time-consuming. can
[0005] There is no report about directly preparing NTAA-modified cellulose membranes in the prior art, so it is necessary to study a method for preparing NTAA-modified cellulose membranes that is efficient, fast, energy-saving and environmentally friendly

Method used

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  • A kind of preparation method of NTAA modified cellulose film
  • A kind of preparation method of NTAA modified cellulose film
  • A kind of preparation method of NTAA modified cellulose film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 6mL of pyridine and 4g of nitrilotriacetic acid into a three-neck flask, stir at room temperature for 30min, then add 6mL of acetic anhydride dropwise, and heat at 65°C for 24h. After the reaction, the mixture was concentrated by distillation under reduced pressure, then washed with ether, triturated and filtered to obtain the target product. The resulting tan product was placed in a desiccator for later use.

Embodiment 2

[0046] 2 g of dry microcrystalline cellulose MCC and 25 mL of dimethylacetamide DMAc were mixed in a three-necked flask, and kept at 130 °C for 30 min. Then, 2 g of LiCl was added to the mixture and heating was continued for 10 minutes. Subsequently, the above mixture was stirred at room temperature for 12 h. Store the final clear cellulose solution in an airtight container in the refrigerator.

Embodiment 3

[0048] Weigh 10 g of the cellulose solution prepared in Example 2 and 5 g of NTAA respectively, and add them into the solution in the round bottom flask. The mixture was heated at 75 °C for 12 h.

[0049] Transfer 3.6g of the modified cellulose solution to a polytetrafluoroethylene mold (Φ=8cm), and place it at room temperature for 30min. The cast modified cellulose solution was soaked in acetone for 1 h and then washed with cold water for 6 h to completely remove the salt. The final wet modified cellulose membranes were freeze-dried on glass Petri dishes. Afterwards, the dried films were peeled off and stored in a desiccator with a relative humidity of ≤20%.

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Abstract

The invention provides a preparation method of an NTAA modified cellulose membrane and an application of NTAA in adsorption of methylene blue. A DMAc / LiCl system commonly used in preparation of a cellulose membrane is directly used as a solvent of NTAA modified cellulose, an intermediate complex step of purifying modified cellulose is omits, the esterification time of cellulose and NTAA is shortened by 1 / 2, and the esterification rate is improved. The 12 h adsorption rate of the prepared modified cellulose membrane to adsorb a methylene blue solution with the pH of 6 reaches 85% or more, and the adsorbing capacity is not significantly reduced after multiple times of adsorption and desorption.

Description

technical field [0001] The invention discloses a preparation method of an NTAA modified cellulose film, which belongs to the technical field of film preparation. Background technique [0002] Cellulose is a widely existing, biodegradable and renewable resource. Cellulose is formed by the dehydration condensation of many β-D-glucose molecules, and its surface contains a large number of active functional groups such as hydroxyl and carboxyl. This structural feature of cellulose makes it possible to prepare various polymer functional materials through a series of chemical modifications. Modified cellulose adsorbent is one of the important development directions. This kind of adsorbent has the advantages of large adsorption capacity, high stability, and reproducibility. In order to obtain better adsorption effect, people further prepare cellulose into cellulose membrane material. Cellulose membrane has high hydrophilicity, good permeability, and strong fouling resistance, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08B3/14B01J20/20B01J20/28B01J20/30C02F1/28C02F101/38
CPCB01J20/24B01J20/28033C02F1/286C02F2101/308C02F2101/38C08B3/14C08J5/18C08J2301/10
Inventor 陶芙蓉史成美崔月芝
Owner 北京国素生态科技集团有限公司
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