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Preparation method for high-strength hydrophobic polyvinyl alcohol composite sponge

A technology of composite sponge and polyvinyl alcohol, which is applied in separation methods, chemical instruments and methods, and liquid separation, can solve the problems of unfavorable material salvage, storage and transportation, poor mechanical strength, etc., and achieves simple methods, high oil absorption efficiency, and good The effect of acid and alkali resistance

Active Publication Date: 2017-10-03
THIRD INST OF OCEANOGRAPHY STATE OCEANIC ADMINISTATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a high-strength hydrophobic polyvinyl alcohol composite sponge, which aims to solve the problem that the existing hydrophobic sponge has poor mechanical strength after oil absorption, which is not conducive to the salvage, storage and transportation of materials

Method used

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  • Preparation method for high-strength hydrophobic polyvinyl alcohol composite sponge
  • Preparation method for high-strength hydrophobic polyvinyl alcohol composite sponge
  • Preparation method for high-strength hydrophobic polyvinyl alcohol composite sponge

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preparation example Construction

[0031] Such as figure 1 As shown, the preparation method of the high-strength hydrophobic polyvinyl alcohol composite sponge provided by the embodiments of the present invention comprises the following steps:

[0032] S101: Weigh 10 g of distilled water and add it to 90 g of ethanol, and stir evenly;

[0033] S102: Weigh 2-6 g of tetraethyl orthosilicate (TEOS) and 1-4 g of γ-(2,3-glycidoxy)propyltrimethoxysilane (GPTMS), and add them into the mixed solution;

[0034] S103: Measure 4 mL of ammonia solution, add it to the above mixed solution, stir and react at room temperature for 2-10 hours, and obtain modified G-SiO with uniform particle size distribution 2 Sol;

[0035] S104: Soak a small piece of PVA sponge (5×5×2cm) in G-SiO 2 Put in the sol for 10-90 minutes, dipping and rolling, the liquid-carrying rate is 60-80wt%, then put it into an oven, and keep it at a temperature of 60-90°C for 10-30 minutes;

[0036] S105: Weigh 2 to 5 g of hexadecyltrimethoxysilane (HDTMS) ...

Embodiment 1

[0046] (1) Take by weighing 10g distilled water and join in 90g ethanol, stir;

[0047] (2) Weigh 2 g of tetraethyl orthosilicate (TEOS) and 1 g of γ-(2,3-glycidyloxy)propyltrimethoxysilane (GPTMS), and add them to the mixed solution of (1);

[0048] (3) Measure 2 mL of ammonia solution, add it to the above mixed solution, stir and react at room temperature for 2 hours, and obtain modified G-SiO with uniform particle size distribution. 2 Sol;

[0049] (4) Soak a small piece of PVA sponge (10×10×2cm) in the G-SiO 2 In the sol for 30 minutes, dipping and rolling, the liquid-carrying rate is 70wt%, and then put it into an oven and keep it at 60°C for 30 minutes;

[0050] (5) Weigh 2 g of hexadecyltrimethoxysilane (HDTMS) and add it to 100 g of ethanol solution, then add 0.1 mL of concentrated hydrochloric acid, and stir at room temperature for 30 min to obtain a hydrolyzate;

[0051] (6) Soak the PVA sponge obtained in (4) in the hydrolyzed solution of (5) for 1h, dip and roll...

Embodiment 2

[0054] (1) Take by weighing 10g distilled water and join in 90g ethanol, stir;

[0055] (2) Weigh 3 g of tetraethyl orthosilicate (TEOS) and 2 g of γ-(2,3-glycidyloxy)propyltrimethoxysilane (GPTMS), and add them to the mixed solution of (1);

[0056] (3) Measure 4 mL of ammonia solution, add it to the above mixed solution, stir and react at room temperature for 4 hours, and obtain modified G-SiO with uniform particle size distribution. 2 Sol;

[0057] (4) Soak a small piece of PVA sponge (5×5×1cm) in the G-SiO 2 In the sol for 60 minutes, one dipping and one rolling, the liquid-carrying rate is 75wt%, then put it into an oven, and keep it at a temperature of 90°C for 10 minutes;

[0058] (5) Weigh 5 g of hexadecyltrimethoxysilane (HDTMS) and add it to 100 g of ethanol solution, then add 0.5 mL of concentrated hydrochloric acid, and stir at room temperature for 20 min to obtain a hydrolyzate;

[0059] (6) Soak the PVA sponge obtained in (4) in the hydrolyzed solution of (5) ...

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Abstract

The invention discloses a preparation method for a high-strength hydrophobic polyvinyl alcohol composite sponge. A two-step solution impregnation method is employed in the invention and comprises the following steps: with 2 to 6 wt% ethyl orthosilicate and 1 to 4 wt% of gamma-(2,3-epoxypropoxy)propyltrimethoxysilane as raw materials, a mixture of ethanol and water in a mass ratio of 9: 1 as a solvent, 2 to 6 v / v% of ammonia water as a catalyst, carrying out a stirring reaction at room temperature for 2 to 10 h so as to prepare a G-SiO2 sol and subjecting a sponge to impregnation and deposition so as to construct a rough structure; and with 2 to 8 wt% of hexadecyltrimethoxysilane as a surface modifier and 0.1 to 1 v / v% of hydrochloric acid as a catalyst, subjecting the sponge to hydrophobic and low-surface-energy modification. The hydrophobic PVA sponge provided by the invention has good acid and alkali resistance, good high-salinity resistance and high oil absorption rate and can be repeatedly used 20 times or more.

Description

technical field [0001] The invention belongs to the technical field of polyvinyl alcohol composite sponge preparation, and in particular relates to a preparation method of high-strength hydrophobic polyvinyl alcohol composite sponge. Background technique [0002] Frequent oil spills and oil spill accidents have brought serious damage to the marine environment and coastal people's lives. Oil-water separation materials with high absorption capacity, high selectivity and good reusability have attracted widespread attention in the world. In particular, efficient and reusable oil-absorbing materials prepared from three-dimensional porous materials have become a hot spot in current research, such as CNT sponges ([J]. Advanced Materials, 2010, 22(22): 617-21), CMP airgel ([J]. Adv. Mater. 2014, 26, 8053), graphene sponge ([J]. Nature Communications, 2015, 6: 6141-6141), etc. However, these methods have disadvantages such as high cost, relatively low efficiency, poor mechanical sta...

Claims

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Application Information

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IPC IPC(8): C08J9/40B01D17/022C08L29/04
CPCB01D17/0202C08J9/40C08J2329/04
Inventor 林凌朱忆徐长安唐旭刘源森
Owner THIRD INST OF OCEANOGRAPHY STATE OCEANIC ADMINISTATION
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