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A kind of lignin anti-sludge sacrificial agent and its preparation method and application in concrete

A lignin and sacrificial agent technology, which is applied in the field of lignin anti-sludge sacrificial agent and its preparation, can solve the problems of low reactivity, poor water solubility, and environmental pollution, and achieve good water solubility, good dispersion performance, and dispersion viscosity reduction performance Excellent effect

Active Publication Date: 2019-10-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But only less than 10% of the lignin has been effectively used, and more than 90% of the lignin will be burned directly, which not only pollutes the environment, but also wastes resources
Lignosulfonate in acid pulping waste liquor is the main application form of industrial lignin, and is widely used as concrete water reducer, pesticide dispersant and dye dispersant, etc., while industrially produced lignin is mainly based on alkali Lignin is dominant, but its application is limited due to its poor water solubility and low reactivity

Method used

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  • A kind of lignin anti-sludge sacrificial agent and its preparation method and application in concrete
  • A kind of lignin anti-sludge sacrificial agent and its preparation method and application in concrete
  • A kind of lignin anti-sludge sacrificial agent and its preparation method and application in concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Put 120g of alkaline pulping black liquor acid-analyzed alkali lignin in a beaker, add 380mL of deionized water, adjust the pH to 12 with sodium hydroxide, fully stir and dissolve for later use. A lignin reaction liquid is obtained.

[0038] (2) Add 180 g of polyethylene glycol monomethyl ether into a four-neck flask, and stir mechanically at 80° C. until dissolved. Then add 1.5g of anhydrous aluminum trichloride and continue to stir evenly. The temperature of the system was lowered to about 65°C, and at 65°C, 20mL of epichlorohydrin was added dropwise, and the reaction was continued for 3h after the dropwise addition was completed. Obtain polyethylene glycol monomethyl ether reaction intermediate.

[0039] (3) The products of step (1) and step (2) were mixed, stirred and reacted at 85° C. for 3 hours to obtain a lignin anti-sludge sacrificial agent.

[0040]Application test of lignin anti-mud sacrificial agent of the present invention in mud-containing slurry (t...

Embodiment 2

[0052] (1) Put 120g of alkaline pulping black liquor acid-analyzed alkali lignin in a beaker, add 380mL of deionized water, adjust the pH to 12 with sodium hydroxide, fully stir and dissolve for later use. A lignin reaction liquid is obtained.

[0053] (2) Add 180 g of polyethylene oxide into a four-neck flask, and stir mechanically at 80° C. until dissolved. Then add 1.5g of anhydrous tin tetrachloride and continue stirring evenly. The temperature of the system was lowered to about 65°C, and at 65°C, 20mL of epichlorohydrin was added dropwise, and the reaction was continued for 3h after the dropwise addition was completed. A polyoxyethylene reaction intermediate is obtained.

[0054] (3) The products of step (1) and step (2) were mixed, stirred and reacted at 85° C. for 3 hours to obtain a lignin anti-sludge sacrificial agent.

[0055] Adopting the same clean pulp fluidity test as in Example 1, rheological curve test, rheological loss over time, XRD analysis and rheologica...

Embodiment 3

[0057] (1) Put 120g of bamboo pulp black liquor acid-analyzed alkali lignin into a beaker, add 380mL of deionized water, adjust the pH to 13 with sodium hydroxide, fully stir and dissolve for later use. A lignin reaction liquid is obtained.

[0058] (2) Add 180 g of methallyl alcohol polyoxyethylene ether into a four-necked flask, and stir mechanically at 80° C. until dissolved. Then add 1.0 g of boron trifluoride ether solution and continue to stir evenly. The temperature of the system was lowered to about 65°C, and at 65°C, 12mL of epichlorohydrin was added dropwise, and the reaction was continued for 3h after the dropwise addition was completed. A polyoxyethylene reaction intermediate is obtained.

[0059] (3) The products of step (1) and step (2) were mixed, stirred and reacted at 85° C. for 3 hours to obtain a lignin anti-sludge sacrificial agent.

[0060] Adopting the same clean pulp fluidity test as in Example 1, rheological curve test, rheological loss over time, XR...

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Abstract

The invention belongs to the technical field of preparation of mud-resistant sacrificial agents and discloses a lignin mud-resistant sacrificial agent, a preparation method thereof, and application thereof in concrete. The lignin mud-resistant sacrificial agent is alkali lignin modified mud-resistant sacrificial agent, can significantly improve fluidity of newly-mixed mud-containing slurry, such as slump or divergence, and is suitable for cement paste, mortar and concrete; the mud-resistant sacrificial agent can be used with polycarboxylic acid to replace 10-15% polycarboxylate products; a product to which the sacrificial agent is added has better dispersion and lower cost. The preparation method according to the invention comprises the steps of mixing 40-100 parts by weight of monomer A and 0.5-8 parts by weight of epichlorohydrin, preheating, adding 0.5-1.5 parts by weight of initiator B, cooling and reacting, adding 30-80 parts by weight of alkali lignin C, and heating and reacting to obtain the alkali lignin modified mud-resistant sacrificial agent; before using the alkali lignin C, pH is adjusted to 11-13.

Description

technical field [0001] The invention belongs to the technical field of preparation of anti-mud sacrificial agent, in particular to a lignin anti-mud sacrificial agent, its preparation method and its application in concrete. The lignin anti-sludge sacrificial agent of the present invention is an alkali lignin modified anti-sludge sacrificial agent, which can significantly improve the fluidity of fresh mud-containing bodies, such as slump or expansion, and is suitable for cement paste, mortar and concrete. Background technique [0002] Concrete is the most widely used building material in today's society. In urban construction and infrastructure construction, in order to obtain high-performance concrete, high-performance water reducing agents are usually added to it. In the 1980s, polycarboxylate superplasticizer was used in concrete as a new generation of concrete admixture. They can significantly reduce the water-cement ratio, improve the flow properties, compressive stren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C04B28/00C04B24/32C04B24/34C04B103/22
Inventor 邱学青郑大锋李小康楼宏铭杨东杰
Owner SOUTH CHINA UNIV OF TECH
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