A pH-responsive silicone foam with an interpenetrating network

An organosilicon foam, interpenetrating network technology, used in polymer materials and petrochemical fields, can solve the problems of easy rupture, unsatisfactory durability, and reduced oil-water separation efficiency.

Active Publication Date: 2021-01-12
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the silicone foam prepared by the above method is applied to oil-water separation, due to the strong lipophilicity of silicone, it is prone to swelling. Although the absorbed oil will increase, it will lead to a decrease in the mechanical strength of the foam. It is easy to break and fail, and the durability is not ideal; in addition, due to the strong lipophilic characteristics, a large amount of oil still exists in the silicone matrix after the oil is squeezed out, resulting in a decrease in the oil-water separation efficiency

Method used

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  • A pH-responsive silicone foam with an interpenetrating network
  • A pH-responsive silicone foam with an interpenetrating network
  • A pH-responsive silicone foam with an interpenetrating network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 24g of vinyl-terminated polydimethylsiloxane with a viscosity of 5000cs, 16g of vinyl MQ resin, 46g of dimethylaminoethyl methacrylate, 4g of ethylene glycol dimethacrylate and 2g of di-tert-butyl peroxide Mix the mixture evenly and add it to the sodium chloride powder. After the air bubbles in the sodium chloride powder are completely removed, seal it and react at 170°C for 2 hours, then use water to dissolve the sodium chloride to obtain a silicone foam. The 60% deformation compressive strength of silicone foam is 0.50MPa.

[0025] pH responsiveness: prepare a hydrochloric acid aqueous solution with a pH of 1, immerse the prepared silicone foam in the hydrochloric acid aqueous solution, the silicone foam changes from the initial hydrophobic state to a hydrophilic state, drop oil droplets (1,2-dichloro ethane), it will be in a super-oleophobic state in water; when the silicone foam is immersed in neutral water (pH=7) or alkaline water (pH>7), the foam will be in a hydr...

Embodiment 2

[0038] 60g of polyvinyl polydimethylsiloxane with a vinyl content of 3% and a viscosity of 10000cs, 70g of dimethylaminoethyl methacrylate, 5g of ethylene glycol dimethacrylate and 1g of di-tert-butyl peroxide The oxides are mixed evenly, and added to the sodium chloride powder. After the air bubbles in the sodium chloride powder are completely removed, seal it, react at 130°C for 10 hours, and then use water to dissolve the sodium chloride to obtain a silicone foam.

[0039]Oil-water separation experiment: Pour 50g of water and 50g of n-hexadecane into a beaker. The silicone foam is placed at the oil-water interface, and the n-hexadecane is quickly absorbed. After taking it out, measure the size of the silicone foam, and the expansion rate is 0%. The oil absorption rate is 98%, and after extrusion and washing with pH=1, the oil removal rate is 93%. The 60% deformation compressive strength of silicone foam is 0.11MPa.

Embodiment 3

[0041] 50g of polyvinyl polydimethylsiloxane with a vinyl content of 10% and a viscosity of 500cs, 60g of 2-vinylpyridine, 4.8g of neopentyl glycol diacrylate and 5g of 2,4-dichloroperoxybenzene Formyl is mixed evenly, and added to the sodium chloride powder. After the air bubbles in the sodium chloride powder are completely removed, it is sealed and reacted at 130°C for 5 hours, and then the sodium chloride powder is dissolved with water to obtain a silicone foam.

[0042] Oil-water separation experiment: Pour 50g of water and 50g of diesel into a beaker. The silicone foam is placed at the oil-water interface, and the gasoline is quickly absorbed. After taking it out, measure the size of the silicone foam. The expansion rate is 0%, and the oil absorption rate is 80%. After extrusion and washing with pH=1, the oil removal rate is 98%. The 60% deformation compressive strength of silicone foam is 1.5MPa.

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Abstract

The invention discloses a silicone foam with interpenetrating network pH responsiveness. A silicone foam with interpenetrating network pH responsiveness, prepared by the following steps: uniformly mixing 25-90 parts by mass of a silicone resin, 10-75 parts by mass of a pH-responsive monomer and 1-5 parts by mass of an initiator , adding to the template agent, after the air bubbles in the template agent are completely removed, seal it, react at 130-190° C. for 1-10 hours, and then use water to dissolve the template agent to prepare the interpenetrating network pH-responsive silicone foam. The present invention selects a polymerizable silicone system and introduces a pH-responsive polymerizable monomer at the same time. The two molecules are polymerized in one pot, and the interpenetrating network silicone foam is obtained through proper ratio adjustment, which ensures that the silicone foam does not swell. At the same time, it has pH responsiveness, which can realize the transformation from lipophilic to oleophobic, so as to achieve the purpose of oil drainage and improve the oil-water separation rate.

Description

Technical field: [0001] The invention belongs to the technical field of polymer materials and petrochemical technology, and in particular relates to an organic silicon foam with interpenetrating network pH responsiveness. Background technique: [0002] Silicone foam is mainly composed of polydimethylsiloxane, which combines the characteristics of silicone and foam, such as hydrophobicity, lipophilicity and high and low temperature resistance. Common silicone foam preparation methods include chemical methods, physical methods and other methods (Zhang Qian et al. Research progress on silicone foam materials[J]. Journal of Hangzhou Normal University (Natural Science Edition), 2016,15(03):230- 235). The template method is a method commonly used in physical methods. Soluble particles are used as templates, injected with organic silicon raw materials, solidified by hydrosilicon addition reaction, and then dissolved in a solvent to obtain foam. The preparation method is simple and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D17/05C02F1/40
CPCB01D17/047C02F1/40
Inventor 刘海峰王美淑魏俊锋孙一峰
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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