Modified polyurethane carrier for grafting acrylic acid by ultraviolet and preparation method and application of carrier

A polyurethane and acrylic technology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve the problems of poor hydrophilic properties of polyurethane carriers, long microbial film hanging time, easy to float, etc. , to achieve the effect of improving anti-pollution ability, improving hydrophilicity and simple operation

Inactive Publication Date: 2018-01-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the poor hydrophilicity of the polyurethane carrier, there are disadvantages such as easy floating after being added to the sewage plant, long time for microorganisms to hang on the film, and easy to fall off. Improving the hydrophilicity of the polyurethane carrier through modification has become a research hotspot in recent years.

Method used

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  • Modified polyurethane carrier for grafting acrylic acid by ultraviolet and preparation method and application of carrier
  • Modified polyurethane carrier for grafting acrylic acid by ultraviolet and preparation method and application of carrier
  • Modified polyurethane carrier for grafting acrylic acid by ultraviolet and preparation method and application of carrier

Examples

Experimental program
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Effect test

preparation example Construction

[0040] The preparation method of the polyurethane carrier used in following examples is as follows:

[0041] Mix isocyanate and polyester polyol at room temperature according to the ratio of 100:46, put it in a mixer, stir evenly at 800rpm, wait for it to foam and expand and solidify, cut into cubes of 2-3cm, and place Dry in an oven at 60°C for later use. It is required that the specific surface area of ​​the foamed polyurethane foam (that is, the polyurethane carrier) is greater than 1000, and the porosity is greater than 96%.

[0042] The characterization method to the hydrophilic modified polyurethane carrier in the following examples is specifically as follows:

[0043] The contact angle is directly measured and read by an instrument, and the instrument used is a DSA100 contact angle measuring instrument.

[0044] Electron micrographs were tested with an electron microscope, and the instrument used was a Hitachi S-4800 cold field emission scanning electron microscope. ...

Embodiment 1

[0050] 1. UV-grafted acrylic modified polyurethane carrier (such as figure 1 shown)

[0051] Step a: immerse a cubic polyurethane carrier with a side length of 2 cm in a methanol solution of 0.2 mol / L benzophenone, take it out after soaking for 2 hours, and let it dry naturally for use;

[0052] Step b: Put the polyurethane carrier treated in step a into the ultraviolet light generating device, immerse it in 15% acrylic acid solution, take it out after 30 minutes of ultraviolet light irradiation, put it in distilled water and wash it clean, and obtain the hydrophilic modified polyurethane carrier.

[0053] 2. Characterization results

[0054]The contact angle of the polyurethane carrier before and after the hydrophilic modification in step 1 was tested, and the results were 116° and 71° respectively. The contact angle of the polyurethane carrier after the hydrophilic modification decreased significantly, and the hydrophilicity improved significantly.

[0055] 3. Immobilizat...

Embodiment 2

[0062] 1. UV-grafted acrylic modified polyurethane carrier

[0063] Step a: immerse a cubic polyurethane carrier with a side length of 3 cm in a 0.5 mol / L ethanol solution of 2,4-dihydroxybenzophenone, take it out after soaking for 1 hour, and let it dry naturally for use;

[0064] Step b: Put the polyurethane carrier treated in step a into the ultraviolet light generating device, immerse it in 20% acrylic acid solution, take it out after 10 minutes of ultraviolet light irradiation, put it in distilled water and wash it clean, and obtain the hydrophilic modified polyurethane carrier.

[0065] 2. Characterization results

[0066] The contact angle of the polyurethane carrier before and after the hydrophilic modification in step 1 was tested, and the results were 118° and 63° respectively. The contact angle of the polyurethane carrier after the hydrophilic modification decreased significantly, and the hydrophilicity improved significantly.

[0067] 3. Immobilization of microor...

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Abstract

The invention relates to a modified polyurethane carrier for grafting acrylic acid by ultraviolet and a preparation method and application of the carrier. The preparation method comprises the following steps: step 1, soaking a polyurethane carrier in a reaction initiation solution, taking out the soaked polyurethane carrier and performing drying, wherein the reaction initiation solution is an alcohol solution of a photosensitizer; and step 2, soaking the dried polyurethane carrier obtained in the step 1 into an acrylic acid solution for ultraviolet radiation, taking out the radiated polyurethane carrier and performing cleaning to obtain the hydrophilic modified polyurethane carrier. The preparation method disclosed by the invention can notably increase the hydrophilicity of the polyurethane carrier and facilitate the adsorption and fixation of microorganisms, and secondary modification can be conveniently performed through the reaction activity of acrylic acid. The hydrophilic modifiedpolyurethane carrier prepared by the preparation method disclosed by the invention has good application prospects in the fields of microbial immobilization, urban sewage treatment, petroleum industrysewage, biology, energy and the like.

Description

technical field [0001] The invention relates to a surface modification process of a polyurethane carrier, in particular to a modified polyurethane carrier with ultraviolet grafted acrylic acid and its preparation method and application. Background technique [0002] The polyurethane carrier has the characteristics of high porosity, large specific surface area, impact resistance and durability, and is widely used in sewage treatment plants as a microbial immobilization carrier. [0003] The adsorption and immobilization of microorganisms on the polyurethane carrier can significantly increase the concentration of microorganisms in sewage treatment plants, enhance the effect of biochemical treatment, and shorten the treatment time; the polyurethane carrier has a high volume load, has a good treatment effect on refractory sewage, and produces less residual sludge and Advantages such as no sludge bulking. [0004] Due to the poor hydrophilicity of the polyurethane carrier, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/06C02F3/12
CPCY02W10/10
Inventor 邱松李昕阳魏令勇杨芳芳
Owner CHINA PETROLEUM & CHEM CORP
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