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Concrete water-reducing agent and its production method

A concrete water-reducing agent and raw material technology, applied in the fields of concrete water-reducing agent and chemical admixture, can solve the problems of inability to meet the performance requirements of high-efficiency water-reducing agent, fast slump loss, low post-strength, etc. The effect of reducing the peak of cement hydration heat and reducing the price

Inactive Publication Date: 2005-11-09
广东粤和实业有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Can washing oil be used to replace industrial naphthalene to produce high-efficiency water reducer? In this regard, various admixture manufacturers have conducted a lot of research on oil washing products, and concluded that there are serious defects as follows: too much air-entraining, rapid slump loss, and low strength in the later stage.
It is reported that there is currently no other method except that SIKA of Switzerland (Dalian) can use about 30% of methylnaphthalene extracted from washing oil to replace 37.5% of industrial naphthalene, which cannot satisfy the market's demand for high-efficiency concrete as an admixture. Performance requirements of water reducer

Method used

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  • Concrete water-reducing agent and its production method
  • Concrete water-reducing agent and its production method
  • Concrete water-reducing agent and its production method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: A kind of concrete water reducer, its raw material composition and the raw material ratio with weight as the unit of measurement are:

[0024] Industrial naphthalene: washing oil = 1: 0.20;

[0025] (Industrial naphthalene + washing oil): sulfuric acid: formaldehyde: modifier: liquid caustic soda

[0026] =1:1:0.56:0.01:0.94.

Embodiment 2

[0028] Industrial naphthalene: wash oil = 1:0.40;

[0029] (Industrial naphthalene + washing oil): sulfuric acid: formaldehyde: modifier: liquid caustic soda

[0030] =1:1~11:0.7:0.02:1

Embodiment 3

[0032] Industrial naphthalene: washing oil = 1: 0.55;

[0033] (Industrial naphthalene + washing oil): sulfuric acid: formaldehyde: modifier: liquid caustic soda =

[0034] =1:1.1:0.93:3:1.70.

[0035] The production method of water reducing agent of the present invention is:

[0036] a. Melting: Add washing oil and industrial naphthalene in the reaction tank according to the ratio, heat it up to 120~130°C to melt;

[0037] b. Sulfonation: add concentrated sulfuric acid to make it sulfonate, control the temperature at 150~160℃, keep it warm for 2~4 hours, and generate aromatic ring sulfonic acid derivatives;

[0038] c. Hydrolysis: at 80°C, add cold water for hydrolysis to remove 2-aromatic ring sulfonic acid;

[0039] d. Modification: add a modifier to form a carboxyl group during condensation to carry out side-connected grafting modification to suppress the air-entraining of groups such as methyl groups, and simultaneously adjust the acidity to 30%.

[0040] The working ...

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Abstract

A water reducing agent for concrete is proportionally prepared from industrial nephthalene, washing oil as the by-product of coking, sulfuric acid, formaldehyde, modifier and liquid alkali through fusing, sulfonating, hydrolyzing, modifying, condensating and neutralizing with alkali.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a chemical admixture technology used to improve the performance of concrete: a concrete water reducer and a production method thereof. The concrete water reducing agent of the present invention is mainly used in improving the function of concrete. Background technique [0002] Concrete high-efficiency water reducer, as a new type of material - admixture, can not only improve the level of construction technology, improve the performance of concrete, but also save a lot of cement, manpower and material resources, and has extremely high value, which has been proved by facts. [0003] However, the raw materials required for the production of prior art concrete high-efficiency water reducers are chemical raw materials in short supply, such as industrial naphthalene, acetone, phenol, etc. This has just caused the shortage of raw materials, the problem that production cost is very hig...

Claims

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Application Information

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IPC IPC(8): C04B24/00
Inventor 彭延山
Owner 广东粤和实业有限公司
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