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Method for producing herbage black liquor modified high efficiency water reducing agent

A high-efficiency water reducer and production method technology, applied in the field of building materials, can solve problems such as air pollution, construction performance is not easy to be guaranteed, and slump loss is fast, so as to achieve the effect of solving pollution problems

Inactive Publication Date: 2007-10-17
CHINA CONSTR THIRD ENG BUREAU GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, naphthalene-based water reducers also have some defects. Firstly, the slump of the prepared concrete loses quickly, especially in summer or when the transportation distance is relatively long. The slump loss can be reduced, but the construction performance of the concrete is not easy to be guaranteed; secondly, due to the reasons of raw materials and production control, the free formaldehyde content in the naphthalene-based water reducer is high, which will damage the concrete. The indoor air environment in the structure causes pollution; and naphthalene, the main raw material of naphthalene-based water reducers, is an important organic chemical raw material. In recent years, its market price has risen sharply, making the cost advantage of naphthalene-based water reducers gradually lost.

Method used

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  • Method for producing herbage black liquor modified high efficiency water reducing agent
  • Method for producing herbage black liquor modified high efficiency water reducing agent
  • Method for producing herbage black liquor modified high efficiency water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Put 1300Kg of industrial naphthalene into the reaction kettle, heat and melt; then raise the temperature to 140°C while stirring, add 1700Kg of 98% concentrated sulfuric acid, and sulfonate at 160-165°C for 2 hours; cool the reactant to 95°C, add 37% 780Kg of formaldehyde, after dripping for about 3 hours, gradually add 2600Kg of 35% herbal plant lignosulfonate, keep warm at 100°C for 5 hours; then neutralize with alkali to pH7~8.

Embodiment 2

[0011] In the reaction kettle, put 1300Kg of industrial naphthalene into it, heat and melt it; then raise the temperature to 145°C while stirring, add 1650Kg of 98% concentrated sulfuric acid, and sulfonate at 160-165°C for 2.5h; cool the reactant to 98°C, add 37 % formaldehyde 800Kg, after dripping for about 2.5 hours, then gradually add 35% herbal plant lignosulfonate 3700Kg, keep warm at 100°C for 4.5 hours; then use alkali to neutralize to PH7-8.

Embodiment 3 ，1300Kg，； to 140℃，98％1600Kg，160～165℃2.5h； to 98℃，37％780Kg，2h，35％4460Kg，100℃6h； and to PH7～8。 Embodiment 4

[0012] Example 3: Put 1300Kg of industrial naphthalene into the reaction kettle, heat and melt; then heat up to 140°C while stirring, add 1600Kg of 98% concentrated sulfuric acid, sulfonate at 160-165°C for 2.5h; cool the reactant to 98°C , 780Kg of 37% formaldehyde was added dropwise, and after about 2 hours of dripping, 4460Kg of 35% herbaceous lignosulfonate was gradually added, and kept at 100°C for 6 hours; then neutralized with alkali to pH 7-8. Embodiment four: detection result

[0013] ① Hazardous substance detection (see Table 1)

[0014] Test items

Herbal black liquor modified superplasticizer

Naphthalene superplasticizer

Heavy

gold

belongs to

Pb

≤0.05ppm / l

≤0.05ppm / l

Cd

≤0.05ppm / l

≤0.05ppm / l

Cr

0.38ppm / l

0.65ppm / l

Hg

0.016ppm / l

0.060ppm / l

As

0.006ppm / l

0.003ppm / l

ammonia

0.03％

≤0.1％

Formaldehy...

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Abstract

A preparation method of herb black liquor modified high-effective water-reducing agent comprises a graft polymerization reaction by adding herbal lignin sulfonate with 20%-240% weight of reactant naphthaline in naphthalene sulfonic acid. The water-reducing rate of herb black liquor modified high-effective water-reducing agent gets to 20%-26%, other performances such as bleeding rate and concrete time-dependent loss are better than naphthalene high-effective water-reducing agent; production cost is reduced lower than that of naphthalene high-effective water-reducing about 25%; ammonia content is low, free formaldehyde content is approximately 1 / 70 of naphthalene high-effective water-reducing agent, ammonia and formaldehyde pollution is not existed basically. The technology is a environmental protection technology, which can solve pollution problem of herb black liquor, lignin and alkali of black liquor as material are used fully, which is uncapable of generating other rejected products.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a production method of a high-efficiency water reducer modified by herbal pulp black liquor for concrete. Background technique [0002] Water reducer is an indispensable fifth component in concrete, especially ready-mixed concrete. At present, a large number of high-efficiency water-reducers are used in the concrete industry. Naphthalene-based high-efficiency water-reducers are currently the domestic The most commonly used high-efficiency water reducer for concrete accounts for about 80% of the total amount of concrete admixtures. However, naphthalene-based water reducers also have some defects. Firstly, the slump of the prepared concrete loses quickly, especially in summer or when the transportation distance is relatively long. The slump loss can be reduced, but the construction performance of the concrete is not easy to be guaranteed; secondly, due to the reasons ...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B24/18C04B103/30
CPCC04B24/226
Inventor 黄波
Owner CHINA CONSTR THIRD ENG BUREAU GRP CO LTD
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