Cement hexavalent chromium reducing agent, and preparation method thereof

A technology of hexavalent chromium and reducing agent, applied in the field of building materials, can solve the problems of easy failure, high price, genetic defects, etc., and achieve the effect of convenient use and long-term effect.

Inactive Publication Date: 2019-11-26
安徽海螺材料科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is toxic if swallowed / very inhaled, may cause sensitization by skin contact, is more likely to cause genetic defects, and is a persistent hazard to the environment
Ferrous sulfate exhibits a good chromium reduction effect when the dosage is 0.5%, but ferrous sulfate itself is very easy to absorb moisture and has unstable chemical properties, which makes it easy to harden and fail
The content of stannous salt is low, and the chromium removal effect is good, but its price is expensive, the cost of cement production is high, and product promotion is difficult

Method used

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  • Cement hexavalent chromium reducing agent, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A cement hexavalent chromium reducing agent is made of the following raw materials in parts by weight: 20 parts of antimony trioxide, 5 parts of polycarboxylate hyperdispersant, 0.5 part of defoamer, and 0.3 part of hydroxypropyl methylcellulose , 90 parts of water. The antimony trioxide is an industrial product with a content of 99.5%; the defoamer is a silicone defoamer with a model of XP-17; the hydroxypropyl methylcellulose has a viscosity of 100,000. Described polycarboxylate hyperdispersant is made by following method:

[0028] 1) Put 50 parts by weight of methacrylic acid and 18 parts by weight of polyethylene glycol into a reaction vessel, add 100 parts by weight of chloroform and 0.8 parts by weight of hydroquinone, and condense in a nitrogen atmosphere at 110°C Reflux for 3.5 hours to obtain the first product;

[0029] 2) Distill the primary product at 40°C under reduced pressure to remove chloroform to obtain esterified macromonomer;

[0030] 3) Put 70 par...

Embodiment 2

[0039] A hexavalent chromium reducing agent for cement is made from the following raw materials in parts by weight: 10 parts of antimony trioxide, 3 parts of polycarboxylate hyperdispersant, 0.2 part of defoamer, and 0.1 part of hydroxypropyl methylcellulose , 80 parts of water. The antimony trioxide is an industrial product with a content of 99.5%; the defoamer is a silicone defoamer with a model of XP-17; the hydroxypropyl methylcellulose has a viscosity of 100,000. Described polycarboxylate hyperdispersant is made by following method:

[0040] 1) Put 50 parts by weight of methacrylic acid and 18 parts by weight of polyethylene glycol into a reaction vessel, add 100 parts by weight of chloroform and 0.8 parts by weight of hydroquinone, and condense in a nitrogen atmosphere at 110°C Reflux for 3.5 hours to obtain the first product;

[0041] 2) Distill the primary product at 40°C under reduced pressure to remove chloroform to obtain esterified macromonomer;

[0042] 3) Put ...

Embodiment 3

[0051] A cement hexavalent chromium reducing agent, which is made of the following raw materials in parts by weight: 5 parts of antimony trioxide, 1 part of polycarboxylate hyperdispersant, 0.2 part of defoamer, and 0.1 part of hydroxypropyl methylcellulose , 70 parts of water. The antimony trioxide is an industrial product with a content of 99.5%; the defoamer is a silicone defoamer with a model of XP-17; the hydroxypropyl methylcellulose has a viscosity of 100,000. Described polycarboxylate hyperdispersant is made by following method:

[0052] 1) Put 50 parts by weight of methacrylic acid and 18 parts by weight of polyethylene glycol into a reaction vessel, add 100 parts by weight of chloroform and 0.8 parts by weight of hydroquinone, and condense in a nitrogen atmosphere at 110°C Reflux for 3.5 hours to obtain the first product;

[0053] 2) Distill the primary product at 40°C under reduced pressure to remove chloroform to obtain esterified macromonomer;

[0054]3) Put 70...

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Abstract

The invention discloses a cement hexavalent chromium reducing agent, and belongs to the technical field of building material. The cement hexavalent chromium reducing agent is composed of, by weight, 5to 20 parts of antimony oxide, 1 to 5 parts of a polycarboxylic acid hyper-dispersant, 0.2 to 0.5 part of a defoaming agent, 0.1 to 0.3 part of hydroxypropyl methyl cellulose, and 70 to 90 parts of water. According to the preparation method, antimony oxide is taken as a hexavalent chromium reducing component, at normal temperature, the antimony oxide is solid, and under alkali conditions, excellent reducing activity is achieved, the sensitivity on temperature and humidity is low, so that antimony oxide possesses great advantages in comparing with conventional ferrous salts and stannous salt reducing agents, and reducing agent long effect lasting characteristic is maintained. The cement hexavalent chromium reducing agent is a suspension liquid; synthesis of the polycarboxylic acid hyper-dispersant and the interaction of the other auxiliary components are adopted, so that the obtained finished product can be stored in the form of a suspension liquid with relative stability, the solid advantage of antimony oxide is maintained, and convenience is provided for product using.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cement hexavalent chromium reducing agent and a preparation method thereof. Background technique [0002] Cement is a powdery hydraulic cementitious material, which can harden in water or air after being stirred with water, and can be used together with sand and gravel to make concrete. [0003] In recent years, the development of the cement industry has consumed a large amount of industrial solid waste. While consuming waste, some pollutants have also been brought into cement, and soluble hexavalent chromium is one of them. In the cement grinding process, the chromium-containing steel balls and cement raw materials in the cement mill are important sources of hexavalent chromium in cement. Hexavalent chromium is poisonous if swallowed / very inhaled, may cause sensitization by skin contact, is more likely to cause genetic defects, and is a persistent hazar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/52C04B7/36
CPCC04B7/36C04B7/364C04B7/52
Inventor 李耀陈烽张辉宋南京司宏振吕晓秦尤敏王志强冯恩娟刘秀敏
Owner 安徽海螺材料科技股份有限公司
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