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Absorbing material with gelatin coupled on surface of polyurethane foam and preparation method and application of absorbing material

A polyurethane foam, adsorption material technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of slow washing speed, cumbersome process, high price, etc. Simplified, mildly conditioned effects

Active Publication Date: 2017-04-05
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

PVPP resin has evacuated nitrogen-containing five-membered rings and amide bonds, has active sites for specific interaction with tannins, and can selectively adsorb plant polyphenols, but it is limited to polyphenol-rich beverages and is expensive and slow to wash out
The collagen fiber adsorption material disclosed in Chinese patent 02134173.7 utilizes the specific interaction between collagen and tannin molecules to achieve selective adsorption and removal of tannin, but there are problems such as limited supply of animal skin and durability of the adsorption material.
Chinese invention patent 2010105597364.4 discloses a non-woven surface covalently bonded gelatin adsorption material, which can effectively remove tannins in water, but the preparation requires the use of sodium azide and polymer resin-based polyazide compounds, and the use of hydrophobic The adsorption material prepared by non-woven fabric has a certain influence on the adsorption and filtration properties
The main problems are: (1) the dangerous reagent sodium azide needs to be used in the preparation of polymer polyazide compounds; (2) the dissolution of polymer resin-based polyazide compounds requires the use of organic solvents; (3) the absorption of adsorption materials Hydrophilicity is not satisfactory
Chinese invention application 201310186790.2 discloses a diazo-coupled gelatin adsorption material on the surface of non-woven fabrics and its preparation method, which can effectively remove tannins in water-based solutions and overcome the main problems in Chinese invention patent 2010105597364.4. But the introduction of its aromatic amine group on the non-woven fabric is realized by the catalyzed condensation reaction of the pre-introduced carboxyl and aromatic diamines on the non-woven fabric. This technique has derived the following problems: (1) need to use N , N, dimethylformamide (DMF) and other organic solvents; (2) need a strong acid catalyst, more than 100 0 C for hours of reaction
CN104549177A discloses a diazo method coupled gelatin adsorption material and its preparation method. The base material used in this method is polypropylene non-woven fabric. Since the surface of this type of base material lacks active groups, in order to achieve the coupling of gelatin Conditions, it is necessary to introduce a variety of reactive groups on the inert polypropylene non-woven fabric through the multi-cloth modification reaction step, the process is too cumbersome
However, self-assembled films are not stable in polar solvents due to the Coulomb force between the thin layers.

Method used

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  • Absorbing material with gelatin coupled on surface of polyurethane foam and preparation method and application of absorbing material
  • Absorbing material with gelatin coupled on surface of polyurethane foam and preparation method and application of absorbing material
  • Absorbing material with gelatin coupled on surface of polyurethane foam and preparation method and application of absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: the preparation method of the adsorption material of this polyurethane foam surface diazo method coupling gelatin, concrete operation is as follows:

[0047] (1) Pretreatment of PUF: Cut the commercially available polyether PUF into a cuboid of 3×6×1cm, wash it with distilled water at 60°C for several times until the washing water is neutral, then dry it in vacuum at 60°C for 24 hours, and use fresh-keeping The film is tightly wrapped and placed in a desiccator for standby; the water absorption rate is measured W A is 1665.1%, tannin adsorption Q 2.7mg / g;

[0048] (2) Amino release of PUF: Add 10g of PUF cuboid with a size of about 3×3×0.2cm into the beaker, add 2 moL / L hydrochloric acid according to the volume-to-mass ratio of hydrochloric acid solution to PUF 50:1 (mL:g) Solution, seal the mouth of the beaker with plastic wrap, boil it in a boiling water bath for 4 hours, take out the product after the reaction and wash it repeatedly with distilled wa...

Embodiment 2

[0054] Embodiment 2: The preparation method of the adsorption material of this polyurethane foam surface diazo method coupling gelatin, concrete operation is: repeat embodiment 1, adjust step (2) hydrochloric acid solution concentration to be 1mol / L, gelatin aqueous solution in step (4) Adjust the concentration to 50g / L, gelatin aqueous solution and diazotization product PUF-N 2 + The volume mass mL:g is 50:1, and the irradiation time at 10cm under the ultraviolet lamp is adjusted to 50min / surface; the gelatin immobilization capacity of PUF-G is measured S 21.3mg / g, water absorption W A 2093.2%, tannin adsorption Q It was 25.7mg / g.

Embodiment 3

[0055] Embodiment 3: The preparation method of the adsorption material of this polyurethane foam surface diazo method coupling gelatin, concrete operation is: repeat embodiment 1, only the gelatin aqueous solution concentration in (4) is adjusted to 125g / L, gelatin aqueous solution and weight Nitriding product PUF-N 2 + The volume mass mL:g is 70:1, and the irradiation time is adjusted to 35min / surface; the water absorption rate of the PUF is measured W A is 1665.1%, tannin adsorption Q 1 It is 2.7mg / g; its SEM photo is shown in figure 1 A, a, ATR-FTIR spectrum see image 3 (a), XPS spectrum see Figure 4 A, surface C content is 62.33%, O content is 37.67%, N is not detected; its PUF-NH is detected 2 Amino content Am 0.7870mmol / g, water absorption W A 1727.5%, tannin adsorption Q 4.3mg / g, its SEM photo is shown in figure 1 B, b, ATR-FTIR spectrum see image 3 (b), XPS spectrum see Figure 4 B, the surface C content is 67.57%, the O content is 27.09%, and the N...

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Abstract

The invention discloses an absorbing material with gelatin coupled on the surface of polyurethane foam and a preparation method of the absorbing material. The method comprises the following steps: with the polyurethane foam as a substrate, first exposing amino groups on the surface of the polyurethane foam by a hydrochloric acid boiling method, then converting the amino groups into diazonium salt through diazotization reaction, next coupling and fixing the gelatin on the surface of the polyurethane foam through electrostatic self-assembly in an aqueous solution of gelatin and denitrification coupling reaction under ultraviolet light irradiation, and finally performing hot-water soaking to prepare the tannin adsorbing material with the gelatin coupled on the surface of the polyurethane foam. The absorbing material has good hydrophilicity, the gelatin immobilization capacity and water absorption rate of the absorbing material can be adjusted within a large range, and the absorbing material has strong absorption capacity for tannin in an aqueous solution; the tannin absorbed by the absorbing material can be desorbed with an aqueous solution of NaOH, so that the absorbing material is regenerated, and the tannin can be recycled; and the regenerated absorbing material can continue to be used for absorbing tannin again, and the absorption capacity of the regenerated absorbing material is not reduced.

Description

technical field [0001] The invention relates to an adsorption material coupled with gelatin by diazo method and a preparation method thereof, in particular to an adsorption material coupled with gelatin by diazo method electrostatic self-assembly on the surface of polyurethane foam, a preparation method and application thereof, belonging to the field of adsorption and separation. Background technique [0002] Tannin and its derived fulvic acid and humic acid are organic by-products of natural fermentation of plant tissues, which are widely present in water bodies near swamps, depressions and coasts, as well as in water flowing through peat soil and decaying vegetation, although there is no significant health hazard , but it will bring a yellow-brown smear to the water body and stain the washed fabrics, utensils and supplies, and it will also bring a strong burnt and earthy smell to the water and affect the visual appearance of the water. In addition, tannins can also enter i...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C08J9/42C08J9/40C08L75/08C08L75/06C02F1/28C02F101/30
CPCC02F1/285C02F1/286C08J9/40C08J9/42B01J20/265C02F2101/30B01J2220/4856B01J2220/4812C08J2489/00C08J2375/06C08J2375/08
Inventor 唐辉张晓春
Owner KUNMING UNIV OF SCI & TECH
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