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Lignin-based hydramine high-efficacy cement grinding aid and preparation method thereof

A technology of lignin-based alcohol amines and cement grinding aids, which is applied in the field of cement grinding aids, can solve the problems of poor grinding aid strengthening ability, and achieve the effects of low production cost, improved adsorption capacity, and small setting time

Inactive Publication Date: 2014-12-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the current application status of lignin derivatives in the cement grinding aid industry, the present invention develops high-performance lignin-based alkanolamine cement for the shortcomings of the existing lignosulfonate cement grinding aids with poor grinding aid enhancement ability grinding aid

Method used

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  • Lignin-based hydramine high-efficacy cement grinding aid and preparation method thereof
  • Lignin-based hydramine high-efficacy cement grinding aid and preparation method thereof
  • Lignin-based hydramine high-efficacy cement grinding aid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Mix 20g of triethanolamine and 10g of triisopropanolamine and heat up to 60°C, add 1g of boron trifluoride etherate catalyst, stir evenly, slowly add 10g of epichlorohydrin dropwise, and complete the dropwise addition within 30min , After the dropwise addition, react at 60° C. for 1 h to obtain the intermediate of chlorohydroxypropanolamine.

[0028] 100g of sodium lignosulfonate is formulated into a solution with a mass concentration of 38%, and the pH is adjusted to 10 with sodium hydroxide solution, and then slowly added dropwise to the middle of the chlorinated hydroxypropanolamine prepared in step (1) at 80°C. After the dropwise addition, react at 80°C for 2 hours. After the reaction, the lignin-based alcohol amine cement grinding aid solution product is obtained, and the powder product can be obtained by spray drying.

Embodiment 2

[0030] Raise the temperature of 20g of triisopropanolamine to 70°C, add 2g of antimony pentafluoride catalyst, stir evenly, slowly add 20g of epichlorohydrin dropwise, complete the dropwise addition within 50min, and react at 70°C for 1.2 h, to obtain the intermediate of chlorinated hydroxypropanolamine.

[0031] 100g of sodium lignosulfonate is formulated into a solution with a mass concentration of 33%, and the pH is adjusted to 11 by using sodium hydroxide solution, and then slowly added dropwise at 90°C in the middle of the chlorinated hydroxypropanolamine prepared in step (1). After the dropwise addition, react at 90°C for 4 hours. After the reaction, the lignin-based alcohol amine cement grinding aid solution product is obtained, and the powder product can be obtained by spray drying.

Embodiment 3

[0033] Mix 5g of ethanolamine and 20g of triethanolamine and heat up to 80°C, add 3g of tin tetrachloride catalyst, stir evenly, slowly add 15g of epichlorohydrin dropwise, and complete the dropwise addition within 60 minutes. ℃ reaction for 2h, to obtain chlorohydroxypropanolamine intermediate. The infrared spectrogram of gained chlorinated hydroxypropanolamine intermediate is as figure 2 As shown, and compared with triethanolamine, it can be seen from the figure that the intermediate of chlorinated hydroxypropanolamine is at 1150~1060cm ‐1 The absorption peak at the position is enhanced, indicating that ether bonds are formed, which is consistent with figure 1 The structure of the chlorohydroxypropanolamine intermediate.

[0034] 100g of sodium lignosulfonate is formulated into a solution with a mass concentration of 40%, and the pH is adjusted to 12 with sodium hydroxide solution, and then slowly added dropwise to the middle of the chlorinated hydroxypropanolamine prepar...

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Abstract

The invention discloses a lignin-based hydramine high-efficacy cement grinding aid and a preparation method thereof. The preparation method comprises the steps of firstly heating hydramine to 60-90 DEG C, then uniformly mixing in the presence of a catalyst, dripping epichlorohydrin and subsequently reacting for 1-2 hours at 60-90 DEG C after dripping is finished to obtain a chlorohydroxypropyl hydramine intermediate product; and preparing a 30%-40% (mass concentration) solution from sodium lignosulfonate, regulating the pH value to 10-13, dripping the chlorohydroxypropyl hydramine intermediate product at 80-90 DEG C, then reacting for 2-4 hours at 80-90 DEG C after dripping is finished, and drying after reaction is over to obtain the product, namely the lignin-based hydramine high-efficacy cement grinding aid. The cement grinding aid disclosed by the invention is a green and high-efficacy cement grinding aid, has good grinding aiding and enhancement abilities to cement clinkers and mixed materials when the addition amount is 0.1 percent, has little impact on the cement setting time, is far superior in comprehensive performance to the conventional lignosulfonate, and basically achieves the efficacy of hydramine cement grinding aids.

Description

technical field [0001] The present invention relates to cement grinding aids, in particular to a method for preparing cement grinding aids by grafting reaction between sodium lignin sulfonate and alcohol amine, in particular to a lignin-based alcohol amine high-efficiency cement grinding aid and its preparation method . Background technique [0002] Cement grinding aid is a chemical additive that improves the grinding effect and performance of cement. It is used in the grinding process of cement materials. Adding a small amount of grinding aid can significantly improve the grinding efficiency or reduce energy consumption, and significantly improve the cement table. hourly output and various technical indicators without compromising the performance of the cement itself. As a chemical activator, the grinding aid can improve the distribution of cement particles and stimulate the hydration power, thereby improving the early strength and later strength of cement. High-efficienc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C04B24/18C04B103/52
Inventor 邱学青杨东杰王文利周明松楼宏铭
Owner SOUTH CHINA UNIV OF TECH