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Long-acting retarder and preparation method thereof

A retarder and long-acting technology, which is applied in the field of long-acting retarder and its preparation, can solve the problems that concrete is difficult to surface or even set in a tank, the effect of retarder is not ideal, and the initial setting time of concrete is advanced, etc., to achieve good Retarding effect, excellent retarding effect, little effect of temperature

Active Publication Date: 2017-09-22
重庆石博士新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Second, when the ambient temperature is high or the cement temperature is high, the initial setting time of concrete will be greatly advanced so that sometimes it will be difficult to wipe the concrete or even congeal, causing other major concrete quality accidents, and In the case of high temperature, the effect of conventional retarders for concrete is not ideal. The higher the temperature, the worse the retarding effect of concrete.

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  • Long-acting retarder and preparation method thereof
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  • Long-acting retarder and preparation method thereof

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preparation example Construction

[0039] The embodiment of the present invention also provides a kind of preparation method of long-acting retarder, comprising:

[0040] The hydroxycarboxylic acid retarder and part of the polyol retarder are mixed to obtain a first mixed liquid; the esterification catalyst, the polymerization inhibitor and the remaining polyalcohol retarder are mixed to obtain a second mixed liquid.

[0041] Mixing the hydroxycarboxylic acid retarder and some polyol retarders in advance can prevent the local reaction concentration from being too high due to uneven distribution of raw materials after the start of the esterification reaction, which will reduce the efficiency of the esterification reaction and increase the by-products. At the same time, in the embodiment of the present invention, the esterification catalyst, the polymerization inhibitor and the remaining polyol retarder are mixed, and the polyol retarder can act as a dispersant, so that the esterification catalyst and the polymeri...

Embodiment 1

[0049] A kind of long-acting retarder, its preparation method is as follows:

[0050] S1. Put 50kg of glycerol at the bottom of the kettle, add 250kg of citric acid three times during the process of heating to 170°C, add one portion of citric acid each time until fully dissolved, and start stirring.

[0051] S2. Add 10 kg of prepared and weighed p-toluenesulfonic acid and 0.01 kg of hydroxyanisole into 120 kg of glycerol, and fully stir.

[0052] S3. Add the mixed S2 to S1 at a constant speed, then raise the temperature to 195° C., and stir at constant temperature for 8 hours.

[0053] S4. After S3 is completed, add 300 kg of sodium tripolyphosphate and 1 kg of low-viscosity cellulose ether, and continue stirring for 1 hour.

[0054] S5. Add dilution water to S4 to reach a concentration of 50% of the solution, so as to facilitate pipeline transportation, storage and application.

Embodiment 2

[0056] A kind of long-acting retarder, its preparation method is as follows:

[0057] S1. Put 200kg of glycerol at the bottom of the kettle, add 550kg of citric acid three times during heating to 170°C, add a portion of tartaric acid each time until fully dissolved, and start stirring.

[0058] S2. Add 40 kg of prepared and weighed p-concentrated sulfuric acid and 0.3 kg of hydroquinone into 260 kg of glycerol, and stir thoroughly.

[0059] S3. Add the mixed S2 to S1 at a constant speed, then raise the temperature to 195° C., and stir at constant temperature for 8 hours.

[0060] S4. After S3 is completed, 100 kg of sodium tripolyphosphate and 1 kg of methyl cellulose are added, and stirring is continued for 1 hour.

[0061] S5. Add dilution water to S4 to reach a concentration of 50% of the solution, so as to facilitate pipeline transportation, storage and application.

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Abstract

The invention discloses a long-acting retarder and a preparation method thereof and relates to the technical field of building materials. A hydroxycarboxylic acid-type retarder and a polyol-type retarder in the retarder undergo an esterification reaction, and the product delayed coagulation component is postponed to be released in the middle and later period of the concrete solidification process. In addition, a plurality of retarders having different action mechanisms are prepared so that the long-acting retarder has a good delayed coagulation effect in the early stage of the solidification process of the concrete to reach long-lasting delayed coagulation in the middle and later period. The preparation method comprises mixing the hydroxycarboxylic acid-type retarder and a part of the polyol retarder to obtain a first mixed liquid, adding a second mixed liquid containing an esterification catalyst into the first mixed liquid, fully mixing the first mixed liquid and the second mixed liquid for an esterification reaction, and then compounding the reaction product and other retarders. The preparation method is easy to operate, has low demands for equipment, can easily and efficiently produce esterification products and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a long-acting retarder and a preparation method thereof. Background technique [0002] Retarder is an admixture that can delay and prolong the setting time of concrete. Its main mode of action is to delay the hydration rate of cement and admixtures, so that concrete has a certain construction plasticity for a longer period of time. At present, there are many kinds of concrete retarders on the market, and different retarders have different effects, dosages and mechanisms of action. The main concrete retarders are: inorganic salts, hydroxycarboxylates , polyhydroxy carbohydrates, lignosulfonates, etc. [0003] We know that the order of influence of cement mineral composition on coagulation and hydration exotherm is tricalcium aluminate > tetracalcium aluminoferrite > tricalcium silicate > dicalcium silicate. Therefore, at the same dosage, the retarding effect ...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B24/06C04B103/22
Inventor 陈杰颜义方世昌皮永奇田应兵
Owner 重庆石博士新材料有限公司
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