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A kind of expanded graphite and zinc oxide composite modified polyurethane sponge and preparation method thereof

A technology of polyurethane sponge and expanded graphite, applied in the field of polyurethane sponge and its preparation, can solve the problems of weakening the adsorption of oil pollution, restricting development, etc., and achieve the effects of strong oil absorption, environmental protection adsorption material, and strong hydrophobicity and lipophilicity.

Active Publication Date: 2018-09-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a cheap, loose and porous adsorption material, polyurethane sponge has a good adsorption effect on oil pollutants. However, due to the strong hydrophilicity of polyurethane sponge, it absorbs a large amount of water when dealing with oil pollution, which weakens its ability to absorb oil pollution. Adsorption, which limits its development in the field of oily wastewater treatment

Method used

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  • A kind of expanded graphite and zinc oxide composite modified polyurethane sponge and preparation method thereof
  • A kind of expanded graphite and zinc oxide composite modified polyurethane sponge and preparation method thereof
  • A kind of expanded graphite and zinc oxide composite modified polyurethane sponge and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] 1) Preparation of expanded graphite dispersion. The expanded graphite prepared in the laboratory with an expansion rate of 310-350mL / g was acid-modified in concentrated sulfuric acid / concentrated nitric acid with a volume ratio of 7:3 for 24 hours, filtered, rinsed with deionized water until neutral, and dried; Put the modified expanded graphite into a mixture consisting of 200ml N,N-dimethylformamide and 6ml tetrabutylammonium hydroxide for 48 hours, filter and wash with ethanol, then ultrasonically disperse in 400ml ethanol solution for 2-3 hours, and filter to obtain expanded graphite The dispersion is ready for use.

[0027] 2) Preparation of zinc oxide colloidal solution. Prepare 200 ml of 0.15 mol / L zinc acetate alcohol solution at 65°C, add ammonia water under stirring conditions until the solution is clear, and continue stirring for 3 hours to obtain a zinc oxide colloidal solution.

[0028] 3) Preparation of polyurethane sponge modified with expanded graphite...

Embodiment 2

[0032] Different oils (diesel oil, lubricating oil, gasoline, soybean oil) and water were separately tested for adsorption by the expanded graphite and zinc oxide composite modified polyurethane sponge prepared by the present invention, in order to obtain the maximum oil / water absorption rate. The test results are shown in Table 1. The oil absorption rate of lubricating oil is as high as 32.86g / g, and the oil absorption rate of gasoline with lower density is 27.79g / g, while the water absorption rate is only 1.24g / g, which shows that the modified Polyurethane sponge has strong hydrophobicity and lipophilicity.

[0033] Table 1 The oil-absorbing and hydrophobic effect of polyurethane sponge modified with expanded graphite and zinc oxide

[0034]

[0035] The expanded graphite and zinc oxide composite modified polyurethane sponge prepared by the invention can be recycled, and after oil absorption, it can be squeezed out to continue oil absorption. Taking diesel oil in water a...

Embodiment 3

[0039] The polyurethane sponge modified by the expansion graphite and zinc oxide compound modified by the present invention is a curve of oil / water absorption rate changing with time. Cut six pieces of modified sponge with a mass of 0.1±0.005g to absorb diesel oil in water, take one of them every once in a while to measure the quality of the modified sponge after adsorption, convert it into adsorption rate, and obtain the curve of oil absorption rate of modified sponge with time ; In the same way, measure the curve of the water absorption of pure water as a function of time of the modified sponge, and the results are as follows: Figure 4 shown. This figure shows that the polyurethane sponge modified with expanded graphite and zinc oxide can reach the saturated adsorption of diesel oil within 2 minutes, and has a very high adsorption rate, while the adsorption rate of water is almost negligible compared with diesel oil. Therefore, The invention can quickly and efficiently selec...

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Abstract

The invention relates to a sponge material and a preparing method thereof, in particular to polyurethane sponge compositely modified through expanded graphite and zinc oxide and a preparing method thereof. The sponge is characterized in that the composite modification is carried out on the polyurethane sponge through expanded graphite and zinc oxide, a layer of even and dense coating is formed on the surface of the polyurethane sponge, and high dewatering lipophilicity (the contact angle between the sponge and water is 149 degrees) is obtained after the sponge is modified. The mass ratio of expanded graphite to zinc oxide is 28:1, and the thickness of the composite coating of the sponge is 0.6-0.9 mm. The prepared sponge can rapidly adsorb oil in water selectively, cyclic utilization can be achieved, and secondary pollution is avoided; an efficient and environment-friendly adsorption material is provided for treating water pollution by oil.

Description

technical field [0001] The invention relates to a sponge material and a preparation method thereof, in particular to a polyurethane sponge compounded and modified by expanded graphite and zinc oxide and a preparation method thereof. Background technique [0002] With the development of modern industry, people's demand for energy is increasingly urgent, and marine oil pollution incidents occur frequently, which has caused great harm to the marine environment. In April 2010, the "Deepwater Horizon" drilling platform in the Gulf of Mexico in the southern United States exploded, and the oil spill caused by the accident formed a pollution zone of more than 100 kilometers long, causing serious pollution. Oil pollution directly affects the survival and development of marine organisms, destroys the diversity of species, and fundamentally affects the structure and function of the marine ecosystem, resulting in the loss of ecosystem diversity and ecological balance. After marine oil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40C08L75/04C08K3/04C08K3/22
Inventor 林爱军徐从斌赵越徐培发焦春磊
Owner BEIJING UNIV OF CHEM TECH
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