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Preparation method of polyurethane-3-amino-5-methylisoxazole fiber and its application in the enrichment detection of heavy metals in food

A technology of methylisoxazole and polyurethane fiber, which is applied in the chemical field, can solve the problems of substandard selectivity and achieve good separation effect, strong anti-interference ability and low detection cost

Inactive Publication Date: 2019-04-16
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Functional materials prepared from polyurethane have wide applicability, especially for the adsorption and enrichment of various heavy metal ions. The disadvantage is that the selectivity is often not up to standard.

Method used

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  • Preparation method of polyurethane-3-amino-5-methylisoxazole fiber and its application in the enrichment detection of heavy metals in food
  • Preparation method of polyurethane-3-amino-5-methylisoxazole fiber and its application in the enrichment detection of heavy metals in food
  • Preparation method of polyurethane-3-amino-5-methylisoxazole fiber and its application in the enrichment detection of heavy metals in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] step one:

[0041] Accurately weigh 2.0g of the original PU fiber and wash it with toluene for 30min, place it in a three-necked bottle with a capacity of 500mL, add 200mL of toluene and raise the temperature to 50°C, then add 2.69mL of diphenylmethane diisocyanate isomer (4,4-MDI) 1.64mL of catalyst triethylamine (TEA), stirred and reacted for 2h under nitrogen protection, filtered out and washed several times with toluene to prepare PU-NCO fibers.

[0042] Step 2: Take 1.0g of the above-mentioned fiber, put it in a three-necked bottle with a capacity of 250mL, add 100mL of toluene, heat up to 50°C, add 200mg of citric acid (CA), an appropriate amount of initiator potassium persulfate, stir and react for 6h under nitrogen protection, and experiment The finished fibers were washed several times with anhydrous ether, and vacuum-dried at 50°C to prepare citric acid grafted polyurethane fibers (PU-CA).

[0043] Step three:

[0044] Accurately weigh 30 mg of PU-CA fiber w...

Embodiment 2

[0056] The reaction solvent in Step 3 in Example 1 was replaced with a different solvent, and the results are shown in the table below.

[0057] Table 1 Elemental analysis results of AMIF in three reaction solvents

[0058]

[0059] As shown in Table 1, the best reaction solvent for AMI and fiber chelation is 1,4-dioxane.

Embodiment 3

[0061] Under optimal reaction solvent condition, change the different reaction temperature of step 3 among the embodiment 1, all the other are completely identical with the step of embodiment 1, thereby explore reaction temperature to synthetic polyurethane-3-amino-5-methylisoxazole fiber Effect of functional base conversion. Figure 6 is the effect of reaction temperature on the conversion rate of polyurethane-3-amino-5-methylisoxazole fiber. Such as Figure 6 As shown, when the reaction temperature is in a lower range (25°C-55°C), the conversion rate of functional groups of chelating fibers increases with the increase of temperature, probably because the higher the temperature, the higher the reaction system can obtain from the outside world. The more energy in the fiber, the more active the organic heterocyclic ligands that get energy become, accelerating the diffusion and concentration to the active sites on the fiber, making the reaction more intense, and the conversion ...

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Abstract

The invention provides a preparation method of polyurethane 3-amino-5-methylisoxazole fibers and application of the polyurethane 3-amino-5-methylisoxazole fibers to enrichment detection of heavy metal in foods. The polyurethane 3-amino-5-methylisoxazole fibers are used as novel functional chelating fibers; the polyurethane 3-amino-5-methylisoxazole fibers have the advantages of stable performance, large adsorption capacity, exclusive selectivity and capability of being completely eluted; furthermore, the polyurethane 3-amino-5-methylisoxazole fibers are combined with the advantages of a spectrophotometry and are used for analyzing and detecting harmful heavy metal in the foods; the polyurethane 3-amino-5-methylisoxazole fibers have the advantages of low cost, simplicity in operation, high accuracy and the like and have very important practical significance on popularization of analysis and detection of the heavy metal in the foods.

Description

technical field [0001] The invention belongs to the technical field of chemistry, and in particular relates to a preparation method and application of polyurethane-3-amino-5-methylisoxazole fiber. Background technique [0002] Human material production activities have intensified, and food pollution incidents have emerged one after another, among which heavy metals are one of the most dangerous harmful pollutants. The heavy metals that contaminate food mainly refer to the five most toxic heavy metals to the human body: Cr, Hg, Pb, Cd and As. Heavy metals can accumulate in the soil and be enriched in animals and plants, and then pass into the human body through the food chain, which brings huge risks to human life and health. Once the content of heavy metals in the human body exceeds the standard, it will cause various terrible diseases. The problem of heavy metal pollution in food has attracted great attention and in-depth research by researchers all over the world. The mon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/352D06M13/425B01J20/26B01J20/28B01J20/30G01N21/31G01N21/33D06M101/38
CPCB01J20/265B01J20/28023D06M13/352D06M13/425D06M2101/38G01N21/31G01N21/33
Inventor 熊春华余欣龙李建丹郑群雄朱敏亮
Owner ZHEJIANG GONGSHANG UNIVERSITY
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