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Method for preparing alginate for fast preparation of hydrogel

A technology of alginate and hydrogel, which is applied in the field of preparation of alginate, can solve problems such as the short period from production to use, the inability to continue to use, and the limitation of the application and promotion of alginate hydrogel, etc., so as to achieve convenient use, Apply a wide range of effects

Active Publication Date: 2009-05-06
QINGDAO BRIGHT MOON SEAWEED BIO HEALTH TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degraded alginate will change greatly regardless of its gelation and water retention, until the final gelation water can no longer be used
Therefore, the current mass-produced wet alginate hydrogel products have a very short period from production to use, which greatly limits the application and promotion of alginate hydrogel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 20 g of commercially available ammonium alginate with a viscosity of 300 mPa.s into a 4% homogeneous aqueous solution with a solution viscosity of 25000 mPa.s.

[0030] Add 20 g of 10% calcium chloride aqueous solution into the stirred alginate aqueous solution, disperse evenly, and react statically for 20 minutes to form jelly.

[0031] The above jelly was dehydrated with 90% ethanol to a water content of 60%.

[0032] The dehydrated material was dried to a moisture content of 14%.

[0033] The dried material is crushed to 150 mesh, and the new alginate obtained can absorb water up to 40 times its own weight to form a hydrogel.

Embodiment 2

[0035] Dissolve 5000 g of commercially available potassium alginate with a viscosity of 600 mPa.s into a 3% homogeneous aqueous solution, and the solution viscosity is 23800 mPa.s.

[0036] Dissolve 350g of calcium chloride and 620g of copper sulfate in 5000g of pure water to make a homogeneous aqueous solution, add it to the stirred alginate aqueous solution, disperse evenly, and react statically for 25 minutes to form a jelly.

[0037] The above jelly was dehydrated with 95% methanol to a water content of 65%.

[0038] The dehydrated material was dried to a moisture content of 13%.

[0039] The dried material is crushed to 180 mesh, and the new alginate obtained can absorb water up to 28 times its own weight to form a hydrogel.

Embodiment 3

[0041] 100kg of commercially available sodium alginate with a viscosity of 1200mPa.s was dissolved into a 2% uniform aqueous solution, and the solution viscosity was 10560mPa.s.

[0042] Dissolve 14kg of copper sulfate and 13kg of zinc chloride in 30kg of pure water to make a homogeneous aqueous solution, add it to the stirred alginate aqueous solution, disperse evenly, and react statically for 30 minutes to form a jelly.

[0043] The above jelly was dehydrated with anhydrous acetone to a water content of 55%.

[0044] The dehydrated material was dried to a moisture content of 13%.

[0045] The dried material is crushed to 200 meshes to obtain a finished product. The new alginate product can absorb water up to 20 times its own weight to form a hydrogel.

[0046] In the above embodiments, the amount of the soluble divalent metal salt and the amount of the alginate satisfy the following relational formula: n alginate:n soluble divalent metal salt is 1:0.05-0.45.

[0047] The a...

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Abstract

The invention provides a method for preparing alginate of hydrogel quickly, which comprises the following steps: 1. the water-soluble alginate is prepared to 0.1 to 1 percent even aqueous solution; 2. soluble divalent metal salt aqueous solution is added with the stirred alginic acid aqueous solution; and after the mixture is dispersed evenly, the mixture is kept stand to react for 10 to 30 minutes so as to generate jelly; 3. the jelly is dehydrated by an organic solvent to the degree that the water content is between 40 and 70 percent; 4. the dehydrated material is dried to the degree that the water content is between 5 and 15 percent; and 5. the dried material is crashed to 80-250 meshes to obtain finished product. The alginate prepared by the method is added with proper amount of water, and the hydrogel product is produced. The use is convenient and quick and the equipment investment is not needed.

Description

technical field [0001] The invention relates to a preparation method of alginate, in particular to a preparation method of alginate used for rapid preparation of hydrogel. Background technique [0002] Hydrogel is a polymer network system, which is soft and can absorb a large amount of water. All water-soluble or hydrophilic polymers can form hydrogels through certain chemical cross-linking or physical cross-linking. As a high water-absorbing and water-retaining material, hydrogel is widely used in many fields, such as: soil water-retaining agent in arid areas, agricultural film, anti-condensation agent in construction, humidity-conditioning agent, and water-blocking agent in petrochemical industry , dehydration of crude oil or refined oil, dust suppressant in mining, preservative and thickener in food, drug carrier in medical treatment, etc. [0003] As a polymeric carboxylic acid, alginic acid can combine with different metal ions to form salts. Different types of algin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/04C08J3/075C08L5/04
Inventor 秦益民王晓梅安丰欣刘洪武李可昌
Owner QINGDAO BRIGHT MOON SEAWEED BIO HEALTH TECH GRP CO LTD
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