Modified aliphatic high-efficiency water-reducing agent by utilizing lignosulfonate and preparation method thereof

A technology of lignosulfonate and high-efficiency water reducer, which is applied in the field of building materials, can solve problems such as environmental pollution and waste of resources, and achieve the effects of simple production process, short production cycle and reduced product cost

Inactive Publication Date: 2010-03-10
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The discharge of papermaking wastewater not only causes a great waste of resources, but also pollutes the environment

Method used

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  • Modified aliphatic high-efficiency water-reducing agent by utilizing lignosulfonate and preparation method thereof
  • Modified aliphatic high-efficiency water-reducing agent by utilizing lignosulfonate and preparation method thereof
  • Modified aliphatic high-efficiency water-reducing agent by utilizing lignosulfonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: first add 1 kg of acetone, 3 kg of sodium sulfite, 0.5 kg of sodium bisulfite and 13 kg of water into the reactor, stir evenly, heat up to 25 ° C for 1.5 h, then add dropwise 0.6 kg of formaldehyde solution for 1.75 h, then heat up to React at 95°C for 5 hours, then lower the temperature to 60°C, add 2.5kg of lignosulfonate and 0.4kg of formaldehyde solution into the reactor, adjust the pH value of the system to 8.0 with an alkaline regulator, and finally raise the temperature to 86°C for 1 hour of reaction Cool down and discharge to get the product.

Embodiment 2

[0025] Example 2: First add 1kg of acetone, 1.5kg of sodium sulfite, 0.5kg of sodium bisulfite, 1.2kg of sodium pyrosulfite and 14.5kg of water into the reactor, stir evenly, raise the temperature to 30°C for 1.2h, then add dropwise 1.05kg of formaldehyde solution for 2 hours, then heated up to 92°C for 4.5 hours, then cooled to 58°C, added 3.5kg lignosulfonate and 0.45kg formaldehyde solution into the reactor, adjusted the pH value of the system to 9.0 with an alkaline regulator, and finally Raise the temperature to 92°C and react for 2.5 hours, then cool down and discharge to obtain the product.

Embodiment 3

[0026] Example 3: first add 1 kg of acetone, 2 kg of sodium sulfite, 1 kg of sodium metabisulfite and 15.2 kg of water into the reactor, stir evenly, raise the temperature to 32 ° C for 1 h, then add 1.3 kg of formaldehyde solution dropwise for 0.25 h, then raise the temperature to 88 ° C for reaction 1h, then lower the temperature to 55°C, add 4kg lignosulfonate and 0.7kg formaldehyde solution into the reactor, adjust the pH value of the system to 13.0 with an alkaline regulator, and finally raise the temperature to 70°C for 1.5h, then cool down and discharge , that is, the product is obtained.

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Abstract

The invention relates to a method for preparing a modified aliphatic high-efficiency water-reducing agent by utilizing lignosulfonate, belonging to the field of concrete water-reducing agents. The invention adopts acetone and formaldehyde as condensation monomers and lignosulfonate as a modifying agent and carries out sulfonating and condensation reactions under an alkaline condition to produce anovel high-efficiency concrete water-reducing agent. The preparation method of the novel high-efficiency concrete water-reducing agent comprises the following steps: (1) adding a sulfonating agent, acetone and water to a reactor, increasing the temperature to 25-65 DEG C and reacting for 0.1-1.5 hours; (2) dipping part of formaldehyde solution for 0.25-2.5 hours, increasing the temperature to 70-95 DEG C and reacting for 1-6 hours; and (3) decreasing the temperature to below 60 DEG C, adding the lignosulfonate and the rest of the formaldehyde solution to the reactor, using an alkaline regulator to regulate a pH value of the system to be 8.0-14.0, increasing the temperature to 70-98 DEG C, reacting for 1-5 hours and decreasing the temperature before discharging. The modified aliphatic high-efficiency water-reducing agent is suitable for producing commercial concrete which has similar color as normal concrete and has smaller collapsed slump loss. By adjusting the process, such as proportioning raw materials, and the like and effectively utilizing the lignosulfonate, the invention not only decreases the product cost, but also lessens environmental pollutants and has favorable industrialized prospects.

Description

Technical field: [0001] The invention relates to a building material, which is suitable for the preparation method of a high-efficiency water reducer for mortar or concrete in construction engineering, more specifically, an aliphatic high-efficiency water reducer prepared by using lignin sulfonate. technical background: [0002] With the continuous development of the construction industry, the demand for concrete is increasing day by day. With the rapid development of the construction industry and the continuous improvement of the design level, starting from the service life, practicability and cost saving of buildings, higher requirements are put forward for concrete, such as increasing the strength of concrete and improving the workability of ready-mixed concrete , Reduce the slump loss of concrete, etc. The ordinary concrete used in the past can no longer meet the requirements. Adding superplasticizers to concrete is an effective way to increase the strength of concrete ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/18C04B103/30
Inventor 罗振扬何明吴达会史以俊顾晓利
Owner NANJING FORESTRY UNIV
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