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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: 2013-06-12
FUZHOU UNIVERSITY
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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

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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) mass of HEMA to it, and react for 55 minutes;

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

[0050] (3) After 1 hour of reaction, add a certain volume of acetone to dissolve the 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 (0.5591 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 (0.3410 g) mass of HEMA to it, and react for 55 minutes;

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

[0056] (3) The temperature was raised to 80°C, and the product of the reaction between IPDI and HEMA was slowly added dropwise (with strict control of the dripping speed) into DMAP, and the reaction was held at a 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 (1.1474 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 (0.6874 g) mass of 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) The temperature was raised to 80°C, and the product of the reaction between IPDI and HEMA was slowly added dropwise (with strict control of the dripping speed) into PEG, and the reaction was held at a constant temperature for 85 minutes.

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

[0064] plan 1

[0065] Pre-polymerization-gelating (PPG)

[0066] Add 30-250 g of deionized water to a three-necked flask immersed in a magnetic s...

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Abstract

The invention discloses a polyurethane modified calcium alginate gel microballoon and a preparation method thereof. The preparation method comprises steps of synthesis of double bond-terminated polyurethane prepolymer and graft modification of calcium alginate. By utilizing a polyurethanes prepolymer side chain, a crystallization area is formed in the interior of natural polysaccharides material calcium alginate gel so as to affect the arrangement of adsorption sites, so that the target molecules can be combined in order in a base material. A single combination form is provided for the target molecule, and the identification selectivity and combined quantity of an imprinted material is improved; the formation of the crystallization area is used as a physical cross linking point, so that the gel material is stable in structure and is improved in resistance to swelling; and the preparation method diversifies the modification methods for natural polysaccharides and provides a new thought for the development, modification and application of marine plants and animals.

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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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 UNIVERSITY
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