Adsorbent material for surface-coupling gelatin of polyurethane foam, preparation method and application thereof

A polyurethane foam and 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, expensive price, etc., achieve mild conditions, simplified steps, The effect of small steric hindrance

Active Publication Date: 2018-11-27
KUNMING UNIV OF SCI & TECH
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  • Description
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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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  • Adsorbent material for surface-coupling gelatin of polyurethane foam, preparation method and application thereof
  • Adsorbent material for surface-coupling gelatin of polyurethane foam, preparation method and application thereof
  • Adsorbent material for surface-coupling gelatin of polyurethane foam, preparation method and application thereof

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 coupled with gelatin, the specific operation is as follows:

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

[0048] (2) Amino release of PUF: Add 10 g of PUF cuboid with a size of about 3 × 3 × 0.2 cm to a beaker, and add 2 moL / L hydrochloric acid according to the volume-to-mass ratio of hydrochloric acid solution to PUF of 50:1 (mL:g). The solution, sealed the mouth of the beaker with plastic wrap, placed it in a boiling water bath and boiled for 4 hours. After the reaction, the product was taken out and w...

Embodiment 2

[0054] Example 2: The preparation method of the adsorption material of the polyurethane foam surface diazo method coupled to gelatin, the specific operation is as follows: repeat Example 1, adjust the concentration of the hydrochloric acid solution in step (2) to 1 mol / L, and in step (4), the aqueous gelatin solution The concentration is adjusted to 50g / L, the gelatin aqueous solution and the diazotized product PUF-N 2 + The volume mass mL:g is 50:1, and the irradiation time at 10cm under the UV 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 is 25.7mg / g.

Embodiment 3

[0055] Example 3: The preparation method of the adsorption material of the polyurethane foam surface diazo method coupled to gelatin, the specific operation is: repeat Example 1, only adjust the concentration of the gelatin aqueous solution in (4) to 125g / L, and the gelatin aqueous solution and weight Nitride 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 its PUF is measured W A 1665.1%, tannin adsorption Q 1 is 2.7mg / g; see its SEM photo figure 1 A, a, ATR-FTIR spectrum see image 3 (a), XPS spectrum see Figure 4 A, the surface C content was 62.33%, the O content was 37.67%, and N was not detected; the PUF-NH was measured 2 Amino content of Am is 0.7870mmol / g, water absorption W A 1727.5%, tannin adsorption Q It is 4.3mg / g, its SEM picture sees figure 1 B, b, ATR-FTIR spectra see image 3 (b), XPS spectrum see Figure 4 B, the surface C content is 67.57%, the O content is 27...

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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 for coupling gelatin by a diazo method and a preparation method thereof, in particular to an adsorption material for coupling gelatin by electrostatic self-assembly on the surface of a polyurethane foam by a diazo method, a preparation method and application thereof, and belongs to the field of adsorption and separation. Background technique [0002] Tannins and their derived fulvic and humic acids are organic by-products of natural fermentation of plant tissues and are widely found in adjacent swamps, depressions and coasts, and in water bodies that flow through peat soils and decaying vegetation, although they do not pose a significant health hazard. However, it will bring yellow-brown smudge to the water body and contaminate 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 c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C08J9/42C08J9/40C08L75/08C08L75/06C02F1/28C02F101/30
CPCB01J20/265B01J2220/4812B01J2220/4856C02F1/285C02F1/286C02F2101/30C08J9/40C08J9/42C08J2375/06C08J2375/08C08J2489/00
Inventor 唐辉张晓春
Owner KUNMING UNIV OF SCI & TECH
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