A kind of retarding cement grinding aid and preparation method thereof

A cement grinding aid and retarding technology, which is applied in the field of cement admixtures, can solve problems such as difficulty in achieving grinding aid effects, poor adsorption and dispersion effects, and unstable effects, so as to optimize particle gradation and delay coagulation Time, the effect of prolonging the setting time

Active Publication Date: 2016-09-14
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition is complex, too many inorganic salts are added to improve the enhancement effect, and the effect is unstable
The adsorption and dispersion effect of sugar substances in cement is not good, and it is difficult to achieve a good grinding aid effect
Moreover, the existing synthesis technology generally needs to use heating and boosting equipment, and the cost is relatively high.

Method used

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  • A kind of retarding cement grinding aid and preparation method thereof
  • A kind of retarding cement grinding aid and preparation method thereof
  • A kind of retarding cement grinding aid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 (No. DE-1):

[0022] A slow-setting cement grinding aid is composed of 20% modified diethanolamine mother liquor, 8% glycerol, 5% sodium sulfate, 67% water, and the total amount is 100%.

[0023] The preparation process of the retarded cement grinding aid has the following steps:

[0024] a. Take by weighing 21.1g diethanolamine and 9.2g epichlorohydrin, add diethanolamine in a three-necked flask with a stirring device, and add epichlorohydrin in a constant pressure dropper for subsequent use; weigh 10g of 40% NaOH aqueous solution, Add it into another constant pressure dropper, open two constant pressure droppers at the same time, slowly drop and stir to control the reaction temperature; after the drop is complete, react for another 1.5 hours;

[0025] b. Pour the reaction product of step a into a beaker and place it in a vacuum drying oven, evaporate the moisture therein, separate out NaCl, and take the supernatant to obtain the modified diethanolamine m...

Embodiment 2～6

[0028] According to the proportioning in Table 1, adjust the consumption of modified diethanolamine mother liquor, glycerin, sodium sulfate and water, and prepare five kinds of retarded grinding aids of embodiment number DE-2~DE-6:

[0029] Table 1 Raw material ratio of Examples 1-6

[0030] Numbering

Embodiment 1～6

[0031] The retarded grinding aids obtained in Examples 1 to 6 (numbering DE-1 to DE-6) were subjected to a small grinding test.

[0032] The cement clinker and gypsum used in the test are all from a cement factory in Jiangyou, Sichuan, and their chemical composition and mass percentage content are shown in Table 2 below (the total amount is 100%, and the remaining mass percentage content is loss on ignition):

[0033] Table 2 Chemical composition of clinker and gypsum

[0034] Element

Loss on ignition

SiO 2

al 2 o 3

Fe2O 3

CaO

MgO

SO 3

clinker%

0.71

19.04

5.62

3.39

63.23

1.92

0.90

plaster%

8.65

1.70

0.30

0.20

38.41

0.80

48.63

[0035] Use a jaw crusher to crush the clinker and gypsum with a mass ratio of 95:5 to less than 5mm, weigh 5kg of raw materials, drop the weighed retarding grinding aid evenly on the raw materials, and then pour the raw materials into φ500mm×500...

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Abstract

The invention discloses a retarding cement grinding aid and a preparation method thereof. The retarding cement grinding aid is characterized by being prepared from the following raw materials in percentage by weight: 20%-30% of modified diethanol amine mother liquor, 1%-10% of glycerol, 5%-10% of sodium sulfate and the balance of water in a mixing manner; and the preparation method of the modified diethanol amine mother liquid comprises the following steps: weighing 21.1-25 parts of diethanol amine, 9.2 parts of epichlorohydrin and 10-12 parts of 40% sodium hydroxide aqueous solution; adding diethanol amine to a reaction container; dropwise adding epichlorohydrin and sodium hydroxide aqueous solution to the reaction container, stirring, and controlling the reaction temperature to be 40-50 DEG C; after dropwise adding, reacting for 1.0-2 hours; and evaporating a reaction product and removing the moisture, and taking supernatant liquid, namely the prepared modified diethanol amine mother liquor. The retarding cement grinding aid disclosed by the invention is easily adsorbed on the surfaces of cement granules; the aid-grinding and retarding effects are good; and the early and later strength of cement can be effectively improved.

Description

technical field [0001] The invention belongs to cement admixtures, and relates to a retarding cement grinding aid and a preparation method thereof. The slow-setting cement grinding aid of the invention is especially suitable for concrete constructed in hot climates, large-volume concrete and cement concrete that needs to be parked or transported for a long time. Background technique [0002] Retarding cement grinding aid is a cement admixture that can not only aid grinding but also delay the setting time of cement; it is mainly used for concrete constructed in hot climates, large-volume concrete, and cement that needs to be parked or transported for a long time in concrete. Retarding cement grinding aids can improve the grinding efficiency of cement clinker, optimize the gradation of cement particles, and increase the strength of cement; it can delay the setting time of concrete, so that fresh concrete can maintain plasticity for a long time and facilitate construction; It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B22/14C04B103/52
Inventor 蒋勇卢忠远陶媛媛宋开平牛云辉
Owner SOUTHWEAT UNIV OF SCI & TECH
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