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Preparation method of industrial hemp stalk core cellulose-based thermosensitive composite hydrogel

A technology of composite hydrogel and industrial hemp, which is applied in the directions of non-active ingredients, such as medical preparations and pharmaceutical formulations, can solve the problems of application limitation, low utilization rate of high added value, etc., and achieve good biocompatibility and good swelling. /Shrinkage performance, the effect of improving responsiveness

Inactive Publication Date: 2015-09-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fibers of the bast part due to their length advantages (in the range of 10-20mm [8] ), plays an important role in large-scale fiber manufacturing industries such as textiles, papermaking, and natural fiber composites; and the fibers in the core part are limited by their length (about 0.5mm [8] ) in many manufacturing industries such as papermaking and textiles have been greatly restricted, and the utilization rate of high added value is low. Now it is mainly used in pulp mills or household combustion to recover heat energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] Example 1: Preparation method of industrial hemp stalk core cellulose-based temperature-sensitive composite hydrogel, the specific operation is as follows:

[0036] (1) The preparation process of "Yunma No. 1" stalk core

[0037] The stalk core is air-dried to control the moisture content to 7%, and the air-dried material is cut to a length of 10mm and a width of 1mm. The thickness depends on the raw material itself and is reserved.

[0038] (2) Extraction of stalk core cellulose

[0039] Use a mixture of hydrogen peroxide and glacial acetic acid to extract cellulose from qualified stalk cores, where the mass percentage concentration is 30%, hydrogen peroxide and glacial acetic acid are mixed in a volume ratio of 1:3 to prepare hydrogen peroxide and glacial acetic acid The mixed solution, the stalk core material has a mass percentage concentration of 8% in the mixed solution, and then is treated at 60° C. for 48 hours. After the reaction is completed, the material is deionized,...

Embodiment 2

[0056] Example 2: The method for preparing industrial hemp stalk core cellulose-based temperature-sensitive composite hydrogel is as follows:

[0057] (1) The preparation process of "Yunma No. 1" stalk core

[0058] The stalk core is air-dried to control the moisture content to 20%, and the air-dried material is cut to a length of 40mm and a width of 3mm. The thickness depends on the raw material itself and is reserved.

[0059] (2) Extraction of stalk core cellulose

[0060] Use a mixture of hydrogen peroxide and glacial acetic acid to extract cellulose from qualified stalk cores, where the mass percentage concentration is 35%, and the volume ratio of hydrogen peroxide and glacial acetic acid is 3:1 to obtain hydrogen peroxide and glacial acetic acid. In the mixed solution, the stalk core material has a concentration of 15% by mass in the treatment solution, and then is treated at 100°C for 12 hours. After the reaction is completed, the material is deionized and washed to neutrality...

Embodiment 3

[0077] Example 3: The method for preparing industrial hemp stalk core cellulose-based temperature-sensitive composite hydrogel is as follows:

[0078] (1) The preparation process of "Yunma No. 1" stalk core

[0079] The stalk core is air-dried to control the moisture content to 10%, and the air-dried material is cut to a length of 20mm and a width of 2mm. The thickness depends on the raw material itself and is reserved.

[0080] (2) Extraction of stalk core cellulose

[0081] Use a mixture of hydrogen peroxide and glacial acetic acid to extract cellulose from qualified stalk cores, where the mass percentage concentration is 32%, and the volume ratio of hydrogen peroxide and glacial acetic acid is 1:1 to obtain hydrogen peroxide and glacial acetic acid. The mixed solution, the stalk core raw material has a mass percentage concentration of 10% in the treatment solution, and then is treated at 80° C. for 36 hours. After the reaction is completed, the material is deionized and washed to...

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Abstract

The invention discloses a method for a cellulose-based temperature-sensitive composite hydrogel of industrial hemp stalks. The air-dried hemp stalk core is cut and prepared, and the stalk core is subjected to cellulose extraction and beating pretreatment, and then piperpene The pyridine nitrogen oxide radical / co-oxidation system method is used to selectively oxidize the pretreated cellulose to obtain nano-oxidized cellulose; at the same time, the pretreated stalk core cellulose is grafted and copolymerized by the aqueous solution polymerization method , to obtain dimethyl diallyl ammonium chloride cellulose network body; then immersed in the aqueous solution of nano-oxidized cellulose, to obtain industrial hemp stalk core cellulose-based temperature-sensitive composite hydrogel; to obtain industrial hemp stalk-core cellulose-based The temperature-sensitive composite hydrogel has UCST characteristics, and the volume phase transition temperature is in the range of 35-50 °C; it has a good application prospect in drug-controlled release carriers, tissue engineering, active enzyme immobilization, and chemical transformation components.

Description

technical field [0001] The invention relates to a technology for manufacturing temperature-sensitive hydrogel by using industrial hemp stalk core cellulose, and belongs to the technical field of natural polymer materials. Background technique [0002] Hydrogel is a hydrophilic but water-insoluble polymer, which is a multi-component system composed of a three-dimensional network of polymers and water. [1] . According to the response of hydrogels to external stimuli, they can be divided into traditional hydrogels and smart hydrogels. Smart hydrogels are a class of hydrogels that can respond sensitively to external stimuli [2] . Typical external stimuli include temperature, pH value, solvent, salt concentration, light, electric field, chemical substances, etc. Due to the potential application of smart hydrogels in chemical converters, memory element switches, sensors, controlled release systems for drugs, artificial muscles, chemical memory, molecular separation systems, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02C08F226/02C08F222/38C08L51/02C08L1/04C08J3/075C08B15/02A61K47/32
Inventor 高欣张恒陈克利
Owner KUNMING UNIV OF SCI & TECH
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