Modification method of oleophylic and hydrophobic nano-sponge

A nano-cotton and hydrophobic technology is applied in the field of preparation of modified nano-cotton oil-absorbing materials, which can solve the problems of high cost, complicated operation, lack of oil-water selectivity, etc., and achieves improved oil absorption, simple operation, and improved reusability. sexual effect

Inactive Publication Date: 2015-10-21
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano cotton is a kind of sponge material with strong adsorption capacity, but it does not have oil-water selectivity, so it can be considered to modify it to improve lipophilicity and hydrophobicity. In addition, the preparation methods of oil-absorbing materials that have been reported generally require multi-step reactions. The operation is more complicated and the cost is higher

Method used

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  • Modification method of oleophylic and hydrophobic nano-sponge
  • Modification method of oleophylic and hydrophobic nano-sponge
  • Modification method of oleophylic and hydrophobic nano-sponge

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Prepare a toluene solution of propyltrichlorosilane with a concentration of 5.0%, soak the nano cotton in the above solution, make it fully absorbed and soak for 5 minutes, take out the sponge and squeeze it dry, fully dry it in a high-temperature drying oven, take it out, and use trichlorosilane Wash with methane three times, squeeze dry, and dry in a vacuum oven until constant weight.

[0031] from figure 1 In (a), it can be seen that there is an uneven polysiloxane layer on the network structure skeleton of the sponge. The polysiloxane layer is very thin, which improves the oil-water selectivity while retaining the porosity of the nano-cotton; (b) shows the unmodified nano-cotton, showing a porous network structure.

Embodiment 2

[0033] Prepare an ether solution of trimethylchlorosilane with a concentration of 0.5%, soak the nano cotton in the above solution, make it fully absorbed and soak for 20 minutes, take out the sponge and squeeze it dry, fully dry it in a high-temperature drying oven, take it out, and wash it with ethanol 3 times, squeeze dry, and place in a vacuum oven to dry to constant weight.

[0034] figure 2 Two white cubes in the middle beaker, the left is the modified nano-cotton, and the right is the unmodified nano-cotton. After immersing them in the same volume of water, the unmodified nano-cotton quickly and completely sank to the bottom of the water, and the modified nano-cotton could float on the water surface for a long time, indicating that its hydrophobicity has been significantly improved.

Embodiment 3

[0036] Prepare a n-hexane solution of dimethyldichlorosilane with a concentration of 0.1%, soak the nano cotton in the above solution, make it fully absorbed and soak for 10 minutes, take out the sponge and squeeze it dry, fully dry it in a high-temperature drying oven, take it out, and use Washed with petroleum ether 4 times, squeezed dry, and dried in a vacuum oven until constant weight.

[0037] image 3 There are two white cubes in the middle, the modified nano-cotton on the left and the unmodified nano-cotton on the right. Drop a drop of water dyed blue by the ink on the surface of the nano-cotton, the water drop on the surface of the modified nano-cotton can maintain a spherical shape, and it does not change much after 10 minutes, while the water droplet on the unmodified nano-cotton is sucked into the nano-cotton disappear quickly. Compared with the unmodified nano-cotton, the hydrophobicity of the modified nano-cotton has been significantly improved.

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Abstract

The invention relates to a preparation method of a modified nano-sponge oil absorption material capable of absorbing oil continuously and selectively. The preparation method comprises the following steps: (1) selecting proper solvents to prepare a silane coupling agent solution of a certain concentration, and adding a nano-sponge material; (2) after the nano-sponge material absorbs the solution sufficiently, soaking for a certain time, and sufficiently drying the soaked nano-sponge material in a high-temperature drying oven; (3) taking out the dried nano-sponge, washing with a solvent for 2 to 4 times, and placing the washed nano-sponge in a vacuum drying oven for drying till the weight is not changed any more. The preparation method has the advantages that as the nano-sponge material of which the internal porosity is high is taken as a reaction base body, the oil retaining capacity of the modified oil absorption material is high; the nano-sponge material is not required to be pretreated before modification; after modification, the oil absorption sponge is still as elastic as common sponge, and can be directly connected onto a pump to recover leaked oil while no water is absorbed, so that the use is convenient; the prepared sponge is higher in continuous oil absorption capability, and can be used in a circulatory manner repeatedly, so that the reusability of the prepared sponge is improved; the preparation process for modified sponge is simple to operate and mild in reaction conditions.

Description

technical field [0001] The invention belongs to the technical field of oil-absorbing materials and environmental protection, and relates to a preparation method of a modified nano-cotton oil-absorbing material capable of continuous and selective oil-absorbing. Background technique [0002] In recent years, with the rapid development of oil production and transportation, oil spills of various sizes and scales have continued to increase. Oil spills and chemical spills have become the most important factors affecting the coastal marine environment and ecosystem, bringing great harm to the marine environment. threaten. In order to avoid the adverse effects of crude oil spills on the ecosystem and the long-term damage of oil pollution, it is necessary to develop materials that can effectively clean up oil pollution. [0003] The development of oil-absorbing materials has experienced a process of evolution from traditional to high-performance. At first, people used sponges, clay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08L61/28
Inventor 吴江渝高慧敏袁琴鄢国平郭庆中杜飞鹏
Owner WUHAN INSTITUTE OF TECHNOLOGY
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