Preparation method for sodium alginate-nano silicon dioxide compound film

A technology of nano-silicon dioxide and sodium alginate, which is applied in the field of preparation of sodium alginate-nano-silica composite film, can solve the problem that the mechanical properties and quality of sodium alginate film cannot be guaranteed, and it is not conducive to silica and seaweed. Sodium complex reaction, inability to effectively control the degradation rate of sodium alginate and other problems, to achieve the effect of good comprehensive performance indicators, good UV protection, simple quality and quality

Inactive Publication Date: 2015-07-22
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the degradation rate of sodium alginate cannot be effectively controlled, and the mechanical properties and quality of the final sodium alginate film cannot be guaranteed.
[0009] 2. Because it adopts the addition method of adding tetraethyl orthosilicate directly into the reaction solution dropwise, on the one hand, the hydrolysis effect of tetraethyl orthosilicate cannot be guaranteed, and more importantly, it will inevitably produce hydrolysis. During the process, the nano-silica is agglomerated and the particle size is too large; moreover, this direct drop method is not conducive to the compound reaction between silica and sodium alginate, which is easy to cause problems such as phase separation.
[0010] 3. Since there must be a large amount of gas components in the reaction system (such as dropwise addition, air brought in during stirring operations, etc.), this will lead to a large number of pores or bubbles in the final prepared sodium alginate film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The preparation method comprises the following steps:

[0073] The first step, raw material preparation: weigh 150g (20 parts by weight, the same below) sodium alginate powder, 37.5 grams (5 parts) of glycerin, 26 grams (1 part) ), 23 grams of absolute ethanol;

[0074] Add all tetraethyl orthosilicate into absolute ethanol until it is completely dissolved, and prepare a silicon source-absolute ethanol solution, wherein the molar ratio of silicon source to absolute ethanol is 1:4;

[0075] The second step is to prepare the sodium alginate stock solution:

[0076] Take 50 g of the above-mentioned sodium alginate powder, add it into 10 L of distilled water, and stir for 12 hours at a temperature of 25 ° C until it is completely dissolved to obtain a sodium alginate stock solution;

[0077] The third step is to prepare sodium alginate-nano silicon dioxide mixed solution:

[0078] Add the above-mentioned sodium alginate stock solution into a reactor with an electric stir...

Embodiment 2

[0091] The preparation method comprises the following steps:

[0092] The first step, raw material preparation: weigh 150g (10 parts) of sodium alginate powder, 37.5 grams (2.5 parts) of glycerin, 52 grams (1 part) of tetraethyl orthosilicate, and 92 grams of absolute ethanol according to the weight ratio;

[0093] Add all tetraethyl orthosilicate into absolute ethanol until it is completely dissolved, and prepare a silicon source-absolute ethanol solution, wherein the molar ratio of silicon source to absolute ethanol is 1:8;

[0094] The second step is to prepare the sodium alginate stock solution:

[0095] Take 50 g of the above-mentioned sodium alginate powder, add it into 10 L of distilled water, and stir for 4 hours at a temperature of 40 ° C until it is completely dissolved to obtain a sodium alginate stock solution;

[0096] The third step is to prepare sodium alginate-nano silicon dioxide mixed solution:

[0097] Add the above-mentioned sodium alginate stock solution...

Embodiment 3

[0110] The preparation method comprises the following steps:

[0111] The first step, raw material preparation: weigh 150g (6.7 parts) of sodium alginate powder, 37.5 grams (1.7 parts) of glycerin, 78 grams (1 part) of tetraethyl orthosilicate, and 207 grams of absolute ethanol according to the weight ratio;

[0112] Add all tetraethyl orthosilicate into absolute ethanol until it is completely dissolved, and prepare a silicon source-absolute ethanol solution, wherein the molar ratio of silicon source to absolute ethanol is 1:12;

[0113] The second step is to prepare the sodium alginate stock solution:

[0114] Take 50 g of the above-mentioned sodium alginate powder, add it into 10 L of distilled water, and stir for 4 hours at a temperature of 40 ° C until it is completely dissolved to obtain a sodium alginate stock solution;

[0115] The third step is to prepare sodium alginate-nano silicon dioxide mixed solution:

[0116] Add the above-mentioned sodium alginate stock solut...

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Abstract

The invention discloses a preparation method for a sodium alginate-nano silicon dioxide compound film. Through a series of technical means of performing in-situ compounding on sodium alginate and nano silicon dioxide, performing ultrasonic defoaming treatment before film casting, increasing the concentration of sodium alginate by step control in a preparation process, controlling addition time and speed of hydrochloric acid and the like, so that nano silicon dioxide is ideally dispersed in a reaction system, an agglomeration phenomenon is avoided, and the sodium alginate/nano silicon dioxide film which is compact in structure, colorless, transparent, airtight, high in quality, degradable, good in waterproof performance and strong in ultraviolet-proof capability, has comprehensive performance indexes and is suitable for food packaging is prepared. Compared with the prior art, the preparation method has the characteristics of simple and easily controlled process, low preparation cost and the like.

Description

technical field [0001] The invention relates to a preparation method of a nanocomposite film, in particular to a preparation method of a sodium alginate-nano silicon dioxide composite film. Background technique [0002] Currently, transitional solid waste discharge and dwindling petroleum resources have led to increasing interest in natural polymers. [0003] Sodium alginate, also known as sodium alginate, kelp gum, alginate, alginate, is a natural polysaccharide carbohydrate extracted from kelp or sargassum. Sodium alginate is the main component of seaweed cell wall and intercellular substance, which is rich in sources and because of its practicability, biocompatibility, non-toxicity, low cost and degradability, and good film-forming properties, it has attracted people's attention to sodium alginate film of interest. [0004] Sodium alginate film is mainly used in food, medicine, environmental treatment, textile, printing and dyeing, papermaking, daily chemical and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/14C08J5/18C08L5/04C08L71/02C08K3/36C08K5/053
Inventor 夏延致杨曼丽
Owner QINGDAO UNIV
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