Polyurethane modified calcium alginate gel microballoon and preparation method thereof

A polyurethane modification, calcium alginate technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the loss of crystal grains, affect the stability of gel materials, and lack of covalent bond between crystal grains and polymer substrates and other problems, to achieve the effect of reducing consumption and good structural stability

Active Publication Date: 2014-08-06
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above research results all start from the introduction of grains from the outside, which can significantly affect the internal aggregate structure, absorbance, mechanical strength and other properties; however, the doping components are mostly inorganic materials, and the grains and polymer substrates lack covalent bonds. , changes in the acidity and alkalinity of the environment and the swelling degree of the gel will lead to the loss of grains, which will eventually affect the stability of the gel material

Method used

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  • Polyurethane modified calcium alginate gel microballoon and preparation method thereof
  • Polyurethane modified calcium alginate gel microballoon and preparation method thereof
  • Polyurethane modified calcium alginate gel microballoon and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Raw materials: isophorone diisocyanate (IPDI); diethylene glycol (diethylene glycol, DEG); hydroxyethyl methacrylate (HEMA);

[0047] Experimental steps: (molar ratio IPDI:HEMA:DEG=1:1:1.2)

[0048] (1) Weigh (0.5563 g) IPDI and place it in a constant temperature water bath (35°C), N 2 environment, add 2 drops of DBTDL, stir magnetically for 2 minutes, slowly add (0.3359 g) HEMA to it, and react for 55 minutes;

[0049] (2) Raise the temperature to 50°C, slowly add the reaction product of IPDI and HEMA into 0.3170 g of DEG dropwise (strictly control the dropping speed), and react at constant temperature for 1 hour;

[0050] (3) After reacting for 1 hour, add a certain volume of acetone to dissolve to obtain a prepolymer solution.

Embodiment 2

[0052] Raw materials: isophorone diisocyanate (IPDI); dimethylolpropionic acid (DMAP); hydroxyethyl methacrylate (HEMA);

[0053] Experimental steps: (molar ratio IPDI:HEMA:DMAP=1:1:1.2)

[0054] (1) Weigh (0.5591g) IPDI and place it in a constant temperature water bath (35°C), N 2 environment, add 2 drops of DBTDL, stir magnetically for 2 minutes, slowly add (0.3410 g) HEMA to it, and react for 55 minutes;

[0055] (2) Dissolve 0.3359 g of DMAP in 3 ml of DMF;

[0056] (3) Raise the temperature to 80°C, add the reaction product of IPDI and HEMA slowly (strictly control the dropping speed) dropwise into DMAP, and react at constant temperature for 85 minutes.

Embodiment 3

[0058] Raw materials: isophorone diisocyanate (IPDI); polyethylene glycol (1000) (PEG); hydroxyethyl methacrylate (HEMA);

[0059] Experimental steps: (molar ratio IPDI:HEMA:PEG=1:1:1.2)

[0060] (1) Weigh (1.1474g) IPDI and place it in a constant temperature water bath (35°C), N 2 environment, add 2 drops of DBTDL, stir magnetically for 2 minutes, slowly add (0.6874 g) HEMA to it, and react for 55 minutes;

[0061] (2) Take a certain volume of acetone to dissolve 5.1403 grams of PEG;

[0062] (3) Raise the temperature to 80°C, add the reaction product of IPDI and HEMA slowly (strictly control the dropping speed) into PEG dropwise, and react at constant temperature for 85 minutes.

[0063] The second step: calcium alginate graft modification, there are two schemes

[0064] plan 1

[0065] Pre-polymerization-gelating (pre-polymerization-gelating, PPG)

[0066] Add 30~250g of deionized water into a three-necked flask immersed in a magnetic stirring constant temperature wate...

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Abstract

The invention discloses a polyurethane modified calcium alginate gel microsphere and a preparation method thereof, comprising the synthesis of a double-bond-terminated polyurethane prepolymer and the graft modification of calcium alginate. The invention utilizes the side chain of the polyurethane prepolymer to form a crystallization region inside the calcium alginate gel, a natural polysaccharide material, to affect the arrangement of adsorption sites, so that target molecules can be combined orderly inside the substrate. Provide a single binding form for the target molecule, improve the recognition selectivity and binding capacity of the imprinted material; at the same time, the formation of the crystal region acts as a physical cross-linking point to obtain the stability of the gel structure and improve the swelling resistance of the gel material; the invention enriches the natural The modification method of polysaccharides provides new ideas for the development, modification and application of marine animal and plant materials.

Description

technical field [0001] The invention belongs to the field of polymer modification, and in particular relates to a polyurethane-modified calcium alginate gel microsphere and a preparation method thereof. Background technique [0002] Calcium alginate gel and its modified materials are important natural polysaccharide polymer materials, which are widely used in many fields such as food and medicine, adsorption and separation resins, solid phase extraction and sensitive sensors. Compared with synthetic resins from petrochemical raw materials, calcium alginate gel is a renewable resource, biodegradable material, and is an environmentally friendly green material. However, the swelling resistance and mechanical strength of calcium alginate gel are not as good as synthetic resins. In order to improve the mechanical and chemical stability of hydrogel molecularly imprinted materials, covalent cross-linking and inorganic particle doping are the main strategies of researchers at home ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/66C08G18/64C08G18/48C08G18/34C08G18/32C08G18/12C08J3/24C08J3/075B01J20/26B01J20/30
Inventor 英晓光王吉超李晓张卫英
Owner FUZHOU UNIV
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