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Preparation method of graphene oxide modified polycarboxylic acid type water-reducer

A technology of graphene modification and polycarboxylate system, which is applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of inability to significantly improve the mechanical properties of concrete, low water-reducing rate of the dosage, and achieve flexural resistance Enhanced compressive strength, reasonable preparation process, and easy-to-obtain raw materials

Active Publication Date: 2013-08-14
广西科达新材料集团有限公司
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  • Application Information

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Problems solved by technology

It not only has the advantages of low dosage and high water-reducing rate, but also can improve the concrete pore structure and compactness. It is widely used in projects with high quality requirements such as roads, railways, and bridges. It is the first choice for the development of high-performance green concrete. The key, but the addition of polycarboxylate water reducer can not significantly improve the mechanical properties of concrete

Method used

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  • Preparation method of graphene oxide modified polycarboxylic acid type water-reducer
  • Preparation method of graphene oxide modified polycarboxylic acid type water-reducer

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Embodiment 1

[0028] Step 1: Pre-oxidation of graphite:

[0029] Under stirring conditions, 20 parts by mass of concentrated sulfuric acid with a mass fraction of 98%, 2.5 parts by mass of potassium persulfate and 2.5 parts by mass of phosphorus pentoxide were successively added into the reactor, the temperature was raised to 80°C, and the mixture was added in batches under stirring. 2 parts by mass of natural graphite raw materials, stirred until uniform, kept at 80°C for 6 hours, filtered and washed with water until the solution was neutral, dried for later use;

[0030] Step 2: preparation of graphene oxide:

[0031] Under ice bath conditions, add 1.5 parts by mass of graphite powder, 1 part by mass of sodium nitrate, 60 parts by mass, and concentrated sulfuric acid with a mass fraction of 98% into the reactor and mix evenly, and add 6 parts by mass within 1 hour under stirring. Potassium permanganate, stirred and reacted for 1 hour at a temperature not exceeding 5°C, raised the tempera...

Embodiment 2

[0036] Step 1: Pre-oxidation of graphite:

[0037] Under stirring conditions, 25 parts by mass of concentrated sulfuric acid with a mass fraction of 98%, 3 parts by mass of potassium persulfate and 3 parts by mass of phosphorus pentoxide were successively added into the reactor, the temperature was raised to 80°C, and the 4 parts by mass of natural graphite raw materials, stirred until uniform, kept at 80°C for 6 hours, filtered and washed with water until the solution was neutral, dried for later use;

[0038] Step 2: preparation of graphene oxide:

[0039] Under ice bath conditions, 1.5 parts by mass of graphite powder, 1 part by mass of sodium nitrate, 60 parts by mass of concentrated sulfuric acid with a mass fraction of 98% were sequentially added to the reactor and mixed evenly, and 8 parts by mass were added within 1 hour under stirring. Potassium permanganate, stirred and reacted for 1 hour at a temperature not exceeding 5°C, raised the temperature to 40°C and stirred...

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Abstract

The invention relates to a preparation method of a graphene oxide modified polycarboxylic acid type water-reducer. A polycarboxylic acid type water-reducer is a novel efficient water-reducer following a naphthalene type water-reducer, a melamine water-reducer and an amino sulfonic acid based water-reducer, but the mechanical property of concrete cannot be obviously improved by adding the polycarboxylic acid type water-reducer. The preparation method comprises the steps of preparing graphene oxide with natural flake graphite, sodium nitrate, concentrated sulfuric acid and potassium permanganate as raw materials; carrying out ultrasonic dispersion on the graphene oxide; and then adding the polycarboxylic acid type water-reducer with a certain proportion to form an intercalation compound of the graphene oxide and the polycarboxylic acid type water-reducer. With the adoption of the modified water-reducer, on the basisthat the existing water-reducing rate is kept, the flexural strength and the compressive strength of a cement-based composite are obviously strengthened, the relevant raw materials are easily obtained, a preparation technology is reasonable, pollution in a preparation process is little, the performance of products is excellent, and the graphene oxide modified polycarboxylic acid type water-reducer is suitable for industrial production.

Description

technical field [0001] The invention relates to a modified polycarboxylate water reducer, in particular to a preparation method of a graphene oxide modified polycarboxylate water reducer. Background technique [0002] Polycarboxylate water reducer is a new high-efficiency water reducer after naphthalene, melamine and sulfamic acid water reducers. Polycarboxylate water reducer is essentially an anionic polymer surfactant, generally with sulfonic acid group and carboxyl group as the main functional groups in the molecular structure, and polyoxyethylene chain segment to provide steric hindrance effect, form a complete comb structure. It not only has the advantages of low dosage and high water-reducing rate, but also can improve the concrete pore structure and compactness. It is widely used in projects with high quality requirements such as roads, railways, and bridges. It is the first choice for the development of high-performance green concrete. The key, but the additi...

Claims

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Application Information

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IPC IPC(8): C04B24/26C01B31/04C04B103/30C01B32/198
Inventor 吕生华马玉娟周庆芳
Owner 广西科达新材料集团有限公司
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