Method for preparing silica nanoparticle-graphene oxide-plant fiber compound

A nanoparticle and silica technology, applied in the field of building materials, can solve the problems of damage to fiber structure, decrease in fiber strength and toughness, etc., and achieve the effects of simple process flow, improved adhesion and reduced erosion.

Active Publication Date: 2019-04-19
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alkaline environment will cause the hemicellulose and lignin solution in the plant...

Method used

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  • Method for preparing silica nanoparticle-graphene oxide-plant fiber compound
  • Method for preparing silica nanoparticle-graphene oxide-plant fiber compound
  • Method for preparing silica nanoparticle-graphene oxide-plant fiber compound

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Taking sisal fiber as an example, silica nanoparticles-graphene oxide-sisal fiber composite was prepared.

[0028] (1) Pretreatment of sisal fibers: cut the natural sisal fibers into short fibers with a length of 30 mm, wash the mud sand and debris on the surface with clear water, and dry them in a blast dryer at 60°C. Then soak in 0.15mol / L NaOH solution for 30min. After alkali treatment, the sisal fiber is repeatedly washed with clean water to neutrality, and dried in a blast dryer at 60°C.

[0029] (2) Graphene oxide was prepared by an improved Hummers method, and configured into a graphene oxide aqueous solution with a concentration of 2 mg / ml.

[0030] (3) Preparation of silica nanoparticle dispersion: 5g of silica nanoparticles and 5g of polycarboxylate superplasticizer were added to the deionized water in 200g (2), after high-speed electromagnetic stirring for 30min, ultrasonic oscillation (600W ) 1.5h to obtain a uniformly dispersed silica nanoparticle dispers...

Embodiment 2

[0034] Taking sisal fiber as an example, silica nanoparticles-sisal fiber composites were prepared.

[0035] (1) Pretreatment of sisal fibers: cut the natural sisal fibers into short fibers with a length of 50 mm, wash the silt and debris on the surface with water, and dry them in a blast dryer at 60°C. Then soak in 0.1mol / L NaOH solution for 1h. After alkali treatment, the sisal fiber is repeatedly washed with clean water to neutrality, and dried in a blast dryer at 60°C.

[0036] (2) Graphene oxide was prepared by an improved Hummers method, and configured into a graphene oxide aqueous solution with a concentration of 1 mg / ml.

[0037] (3) Preparation of silica nanoparticle dispersion: add 2g of silica nanoparticles and 0.2g of polycarboxylate superplasticizer to 200g of the graphene oxide dispersion in (2), and after high-speed electromagnetic stirring for 10min, Ultrasonic oscillation (600W) for 0.5h to obtain a uniformly dispersed silica nanoparticle-graphene oxide disp...

Embodiment 3

[0040] Taking coconut shell fiber as an example, silica nanoparticles-graphene oxide-coir fiber composites were prepared.

[0041] (1) Pretreatment of coconut shell fiber: cut the natural coconut shell fiber into short fibers with a length of 20-30mm, wash the mud sand and debris on the surface with water, and dry it in a blast dryer at 60°C. Then soak in 0.5mol / L NaOH solution for 30min. After the alkali treatment, the coconut shell fiber is repeatedly washed with clean water to neutrality, and dried in a blower dryer at 60°C.

[0042] (2) Graphene oxide was prepared by an improved Hummers method, and configured into a graphene oxide aqueous solution with a concentration of 1 mg / ml.

[0043] (3) Preparation of silica nanoparticle dispersion: add 1g of silica nanoparticles and 2g of polycarboxylate superplasticizer to 200g of the graphene oxide dispersion in (2), and after high-speed electromagnetic stirring for 10min, ultrasonically Oscillate (600W) for 0.5h to obtain a uni...

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Abstract

The invention belongs to the technical field of building materials, and discloses a method for preparing a silica nanoparticle-graphene oxide-plant fiber compound. The method comprises the following steps of 1, pretreating natural plant fibers; 2, preparing a graphene oxide dispersion liquid; 3, preparing a silica nanoparticle-graphene oxide dispersion liquid; 4, immersing plant fibers into the silica nanoparticle-graphene oxide dispersion liquid with a certain concentration, and taking out and drying the plant fibers after full and thorough immersion. Silica nanoparticles coating the surfacesof the plant fibers of the compound and a hydrated product calcium hydroxide have a pozzolanic reaction, the alkalinity of a cement matrix can be reduced, and the erosion to the plant fibers is reduced accordingly; generated hydrated calcium silicate can improve the adhesion of the plant fibers and a cement matrix interface, the adhesion strength of the adhesion between the plant fibers and the cement matrix interface can also be improved through a reaction between reactive functional groups of graphene oxide and the hydrated product, and the compound has great application prospects in the aspect of toughening crack-resistant cement-based materials.

Description

technical field [0001] The invention relates to a method for coating silicon dioxide nanoparticles and graphene oxide composites on the surface of plant fibers, and belongs to the technical field of building materials. Background technique [0002] Cement-based materials are currently the most used building materials in the world, but they are brittle and easy to crack. Studies have shown that fibers have a good control effect on the cracking of cement-based materials. Steel fibers and synthetic fibers can improve the toughness of concrete to a certain extent, but increase the cost of concrete. In order to effectively reduce the cost of fiber concrete, researchers began to use plant fibers widely distributed in nature, cheap, and easy to obtain materials to replace traditional synthetic fibers. The application of plant fiber to cement-based composite materials can not only improve toughness, but also promote sustainable development, has ecological effects, and is in line w...

Claims

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Application Information

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IPC IPC(8): C04B30/02C01B32/198C01B33/18
CPCC01B33/18C04B30/02C01B32/198C04B14/024C04B14/062C04B18/24C04B2103/302
Inventor 赵丽吴浩章嘉颖刘园园郭新立
Owner CHANGZHOU INST OF TECH
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