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Polycarboxylate cement grinding aid and preparation method thereof

A technology of cement grinding aid and polycarboxylate, which is applied in the field of cement process additives to achieve the effects of small effective dosage, lower production cost, and reduced effective dosage

Active Publication Date: 2012-07-18
SHANXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the polymer-synthesized polycarboxylates also have the function of aiding grinding, and their performance is stable. At the same time, they can also improve the performance of cement. Grinding aids, activators, reinforcing agents, etc.) are compounded to obtain grinding aids, but this type of grinding aid is not a real synthetic grinding aid, and has disadvantages such as unstable performance and narrow application range

Method used

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  • Polycarboxylate cement grinding aid and preparation method thereof
  • Polycarboxylate cement grinding aid and preparation method thereof
  • Polycarboxylate cement grinding aid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 50 g of MA and 38 g of TEA into a four-necked flask, stir and raise the temperature to 80° C., and react for 3 hours to obtain a light yellow liquid which is small monomer A.

[0045] Dissolve 60 g of macromonomer APEG (molecular weight 1200) at 70°C and add it to a four-necked flask, and add H 2 O 79g, small monomer MA 5.1g, and above-mentioned synthesized small monomer A 10.8g, stir evenly, heat up to 72 ℃, at this moment add the initiator (NH 4 ) 2 S 2 o 8 3.1g, keep the temperature constant, react for 4 hours. Lower the temperature and add TEA solution (12.6g TEA dissolved in 12.6g H2 O) to neutralize to pH=7.0, control the final solid content of the solution to 50%, and the obtained yellow mucus is the polycarboxylate cement grinding aid.

Embodiment 2

[0047] Add 60 g of MA and 37.4 g of MEA into a four-necked flask, stir and raise the temperature to 80° C., and react for 3 hours to obtain a brownish-yellow liquid, which is small monomer A.

[0048] Dissolve 50 g of macromonomer APEG (molecular weight 1100) at 60°C and add it to a four-necked flask, and add H 2 O 64.6g, small monomer MA 4.5g, and above-mentioned synthetic small monomer A 10.1g, stir evenly, heat up to 72 ℃, at this moment, add the initiator (NH 4 ) 2 S 2 o 8 2.6g, keep the temperature constant, react for 4 hours. Lower the temperature, and add TEA solution (12.4g TEA dissolved in 15.0g H 2 O) to neutralize until pH = 7.5, control the final solid content of the solution to 50%, and the resulting yellow mucus is the polycarboxylate cement grinding aid.

Embodiment 3

[0050] Add 40 g of MA and 30.4 g of TEA into a four-necked flask, stir and raise the temperature to 80° C., and react for 3 hours to obtain a light yellow liquid which is small monomer A.

[0051] Dissolve 50 g of macromonomer APEG (molecular weight 1000) at 60°C and add it to a four-necked flask, and add H 2 O 65.3g, small monomer MA 4.9g, and the above-mentioned synthesized small monomer A 10.4g, stir evenly, heat up to 72°C, at this time, add the initiator Na into the flask twice 2 S 2 o 8 , add 1.6g (60% of the total amount of initiator) for the first time, react for 3 hours, add 1.1g (40% of the total amount of initiator) for the second time, react for 2 hours, cool down, and wait for the polymerization solution to cool to 40°C Add TEA solution (11.9g TEA dissolved in 14.6g H 2 O) to neutralize until pH = 7.0, control the final solid content of the solution to 50%, and the resulting yellow mucus is the polycarboxylate cement grinding aid.

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Abstract

The invention provides polycarboxylate cement grinding aid and a preparation method thereof. The preparation method comprises the following steps of: carrying out an acylation reaction on maleic anhydride and alkylol amine to synthesize a small monomer; and then copolymerizing the small monomer with allyl polyethylene glycol as a large monomer and maleic anhydride as a small monomer under an aqueous solution condition. The polycarboxylate cement grinding aid can increase the flowability of cement, so that the cement with the polycarboxylate cement grinding aid is beneficial to being transported, can be avoided from being arched and has good adaptability, strong stability, small effective dosage and wide adaptability. After the polycarboxylate cement grinding aid is added, 3 to 8 kilowatt-hours can be averagely reduced while producing per ton of cement. The preparation method disclosed by the invention has the advantages of simple formula design, convenience for production operation and no exhaust of three wastes and can realize the clean production of the cement grinding aid.

Description

technical field [0001] The invention relates to the technical field of cement process additives, in particular to a polycarboxylate cement grinding aid and a preparation method thereof. Background technique: [0002] In the ball milling process of cement production, the friction between the materials and between the materials and the steel balls will cause the materials to be charged with static electricity, making the materials adsorb on the surface of the steel balls, causing ball wrapping, reducing the efficiency of ball milling, and reducing the output and quality of cement. , the power consumption per unit of cement output increases. In order to eliminate the static electricity carried by the material, it is necessary to add cement grinding aids to the material during the ball milling process of cement production. [0003] China is a big country that produces and consumes cement in the world, and its cement output accounts for more than 50% of the world's total cement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F290/06C08F222/06C08F222/22C08F222/38C04B103/52
Inventor 任建国王自为裴继凯卫晓慧李军平董波王正波
Owner SHANXI UNIV
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