Method for preparing microgel composite hydrogel

A composite hydrogel and microgel technology, which is applied in the field of polymers, can solve the problems of complex preparation process, dehydration, and great influence on hydrogel performance, and achieve excellent mechanical properties

Inactive Publication Date: 2012-02-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using microgels containing double bonds to prepare microgel composite hydrogels, it is necessary to prepare microgels containing double bonds by chemical modification on the basis of reactive microgels, which makes the whole preparation process very complex
[0005] The Chinese patent No. 200910255805.X discloses a method for preparing a microgel composite hydrogel using a prepared polymer with a water content of about 75%. The performance of the gel has a great influence

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 41g acrylamide, 5g AMPS, 5g N-methylol acrylamide, 0.03g N,N'-methylenebisacrylamide, 70ml water into a 500ml flask, add 3g OP-10, 10gSP80, and after fully stirring, add 110ml of cyclohexane was purged with nitrogen for 20 minutes, then 0.005g of ammonium persulfate and 0.01g of sodium bisulfite were added as initiators, and reacted for 3 hours to obtain an N-methylol-containing microgel emulsion. Take 8.5 g of the emulsion to precipitate with acetone and redisperse it in water to obtain 54 g of dispersion. Take 6.8g of the dispersion in a 150ml beaker, add 20.6g of acrylamide, 4.1g of AMPS, 68.5ml of water, fully stir and dissolve for 10 minutes to form a prepolymerized solution, drive oxygen for 20 minutes, add 0.003g of ammonium persulfate and 0.01g Sodium bisulfate. After 5 hours of polymerization at room temperature to obtain a microgel composite polymer, 3 g of long strip polymer was cut out, and after natural drying at room temperature for 10 days, it was hea...

Embodiment 2

[0048] Others are the same as in Example 1. The polymer that has been naturally dried at room temperature for 10 days is heat-treated at 50°C for 4 hours.

[0049] The performance test is the same as in Example 1, and the results are as follows:

[0050] Tensile strength 93kPa, elongation at break 339%

Embodiment 3

[0052] Others are the same as in Example 1. The polymer that has been naturally dried at room temperature for 10 days is heat-treated at 80°C for 3 hours.

[0053] The performance test is the same as in Example 1, and the results are as follows:

[0054] Tensile strength 139kPa, elongation at break 119%

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Abstract

The invention belongs to the technical field of polymers, and relates to a method for preparing microgel composite hydrogel from a naturally dried polymer. The method comprises the following steps of reactive microgel emulsion preparation, dispersed liquid preparation, pre-polymerized liquid preparation, microgel composite polymer preparation, natural dehydration and heating treatment. The method is characterized in that acrylamide is utilized as a main monomer; N-hydroxymethyl acrylamide is utilized as a functional monomer; and a prepared microgel composite polymer is dehydrated in a natural environment and then is heated to form the microgel composite hydrogel. The method can prepare the microgel composite hydrogel from a naturally dried polymer by heating treatment, so that all microgel composite hydrogel preparation processes are easy to be controlled and performance instability caused by water-containing polymer excessive dehydration in heating is avoided. The microgel composite hydrogel obtained by the method has excellent mechanical properties, wherein tensile strength of the microgel composite hydrogel is obviously higher than that of hydrogel prepared from a polymer with water content of 75% by heating.

Description

Technical field: [0001] The invention belongs to the field of polymer technology, and particularly relates to a method for preparing a microgel composite hydrogel by using a naturally dried polymer. Background technique: [0002] Hydrogel is a functional polymer material with a three-dimensional network structure, which can absorb water and swell but is insoluble in water, and has good water retention and biocompatibility. It can be widely used in many fields such as medicine, medical treatment, health care, construction, agriculture, forestry, horticulture, irrigation, soil improvement, petrochemical industry, sewage treatment and tissue engineering. Traditional hydrogels are prepared by small-molecule chemical crosslinkers (such as N,N'-methylenebispropylenamide). Due to the disordered distribution of cross-linking points in the system, the length of the chain links varies, so that the stress that each chain can withstand is different. The stress is easy to concentrate on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08F220/56C08F220/58C08J3/075
Inventor 赵芳秦绪平
Owner SHANDONG UNIV
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