Preparation of dialdehyde carboxymethyl cellulose and method for testing aldehyde group content

A technology of sodium carboxymethyl cellulose and dialdehyde carboxymethyl cellulose is applied in the field of preparation of dialdehyde carboxymethyl cellulose and the detection of aldehyde group content, so as to improve the utilization rate, avoid side reactions and improve the reactivity. Effect

Inactive Publication Date: 2008-08-27
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And to the modification of carboxymethyl cellulose itself, such as changing functional groups, etc. to impro

Method used

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  • Preparation of dialdehyde carboxymethyl cellulose and method for testing aldehyde group content
  • Preparation of dialdehyde carboxymethyl cellulose and method for testing aldehyde group content
  • Preparation of dialdehyde carboxymethyl cellulose and method for testing aldehyde group content

Examples

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Effect test

Embodiment 1

[0037] Weigh 100 parts of sodium carboxymethylcellulose and dissolve it with 20 times the volume of distilled water, then weigh 100 parts of sodium periodate and dissolve it with 10 times the volume of distilled water. Under the condition of about 35°C, sodium carboxymethylcellulose solution and sodium periodate solution are simultaneously added to the reactor equipped with stirring device and temperature testing device, and the pH of the reaction system is adjusted to 2.0 with sulfuric acid. After reacting for about 4hrs, pour the reaction liquid into the solution storage, add 5 times the volume of acetone for precipitation, filter and separate after sufficient precipitation, wash the precipitate alternately with distilled water and acetone until no iodate is detected in the washing liquid, and then dry , Crush to obtain dialdehyde carboxymethyl cellulose. The aldehyde group content of the dialdehyde carboxymethyl cellulose is determined by the hydroxylamine hydrochloride met...

Embodiment 2

[0039]Weigh 200 parts of sodium carboxymethylcellulose and dissolve it with 20 times the volume of distilled water, then weigh 200 parts of periodic acid and dissolve it with 10 times the volume of distilled water. Under the condition of about 35°C, sodium carboxymethylcellulose solution and sodium periodate solution are simultaneously added to the reactor equipped with stirring device and temperature testing device, and the pH of the reaction system is adjusted to 3.0 with sulfuric acid. After reacting for about 4hrs, pour the reaction liquid into the solution storage, add 3 times the volume of acetone for precipitation, filter and separate after sufficient precipitation, wash the precipitate alternately with distilled water and acetone until no iodate is detected in the washing liquid, and then dry , Crush to obtain dialdehyde carboxymethyl cellulose. The aldehyde group content of the dialdehyde carboxymethyl cellulose is determined by the hydroxylamine hydrochloride method,...

Embodiment 3

[0041] Weigh 200 parts of sodium carboxymethylcellulose and dissolve with 20 times the volume of distilled water, then weigh 180 parts of sodium periodate and dissolve with 10 times the volume of distilled water. Under the condition of about 45°C, sodium carboxymethylcellulose solution and sodium periodate solution are simultaneously added to the reactor equipped with stirring device and temperature testing device, and the pH of the reaction system is adjusted to 3.0 with sulfuric acid. After reacting for about 4hrs, pour the reaction solution into the solution storage, add 2.5 times the volume of absolute ethanol for precipitation, filter and separate after sufficient precipitation, and alternately wash the precipitate with distilled water and acetone until no iodate component is detected in the washing solution. Then dry and pulverize to obtain dialdehyde carboxymethyl cellulose. The aldehyde group content of the dialdehyde carboxymethyl cellulose was determined by the hydro...

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Abstract

The invention discloses a method for preparing dialdehyde carboxymethyl cellulose and a method for detecting aldehyde content, wherein the method for preparing dialdehyde carboxymethyl cellulose comprises the following steps: dispensing sodium carboxymethyl cellulose 100 parts by dry weight and oxidant 80-100 parts by dry weight into solution reaction system, adjusting pH value scale of the reacting system between 1.5 and 4.0 and the reaction temperature between 25 and 45 DEG C to react for 1-10 hrs, charging precipitant to make the product precipitate and enabling the produce is dissolved out completely, and obtaining the product dialdehyde carboxymethyl cellulose which aldehyde group content is detected by hydroxylamine method via separating, washing and drying. By adopting the invention for preparing dialdehyde carboxymethyl cellulose, the aldehyde content can be controlled. A plurality of side reactions are prevented due to using periodic acid and periodic acid salt which is provided with high-degree selectivity as oxidant, thereby improving the raw material utility. The prepared dialdehyde carboxymethyl cellulose of the invention can be a biological medical material and a green leather tanning agent.

Description

technical field [0001] The invention relates to a new method for preparing dialdehyde carboxymethyl cellulose by oxidative modification of carboxymethyl cellulose and a method for detecting the content of aldehyde groups in the dialdehyde carboxymethyl cellulose. The prepared dialdehyde carboxymethyl cellulose belongs to macromolecule material and can be used as biomedical material and green leather tanning agent. Background technique [0002] Cellulose is a natural organic polymer compound rich in natural resources and renewable, and about 101.1 to 101.2 billion tons of cellulose are synthesized in nature every year. Cellulose is a linear polysaccharide composed of D-glucopyranose ring via β-1,4 glycosidic bonds. It is cheap, degradable and does not pollute the environment. However, the poor solubility of cellulose limits its application. Therefore, chemical, physical or biological means are used to open the bonds in the cellulose molecular chain and introduce new function...

Claims

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Application Information

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IPC IPC(8): D21C5/00G01N31/00
Inventor 穆畅道林炜李宏利彭洲
Owner SICHUAN UNIV
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