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Retarder used in refractory material

A technology of refractory materials and retarders, applied in the field of retarders, can solve problems such as high temperature performance damage, construction failure, and insufficient construction time, and achieve the effects of system stability, delayed hydration speed, and good dispersion retention

Pending Publication Date: 2021-02-23
武汉善达化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional retarders used in refractory castables often have insufficient construction time at higher temperatures, resulting in construction failures
Ultimately lead to the defect that the high temperature performance of the castable containing silica fume is damaged to varying degrees, so it is necessary to provide a retarder with better performance in this field

Method used

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  • Retarder used in refractory material
  • Retarder used in refractory material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 10g (0.01mol) of polyneopentyl glycol adipate (molecular weight 1000), 10mL of N-methylpyrrolidone, 2.54g (0.005mol) of methylsilsesquioxane, add the in a three-neck flask. Stir at a constant speed with a stirrer, and heat up to 50° C.; add 4.45 g (0.02 mol) of isophorone diisocyanate after the temperature of the solution in the reaction vessel reaches 50° C. Then add the catalyst dibutyltin dilaurate (the amount accounts for 2% of the total mass of the reaction system), keep the temperature for 1 hour after the addition, then raise the temperature to 70° C., and keep the temperature for 4 hours. Add 1.04g (0.01mol) sodium bisulfite, strengthen the stirring, continue stirring for 1h, add water into the reaction kettle, and stir for 30min to obtain a retarder for refractory materials, named as HN-1.

Embodiment 2

[0021] Weigh 15g (0.01mol) of polytrimethylene adipate (molecular weight 1500), 15mL of N-methylpyrrolidone, 2.54g (0.005mol) of methylsilsesquioxane, and add them to a three-necked flask equipped with a reflux condenser . Stir at a constant speed with a stirrer, and raise the temperature to 50° C.; add 3.5 g (0.02 mol) of toluene diisocyanate after the temperature of the solution in the reaction vessel reaches 50° C. Then add the catalyst stannous octoate (the amount accounts for 3% of the total mass of the reaction system), keep the temperature for 1 hour after adding, then raise the temperature to 70° C., and keep the temperature for 4 hours. Add 1.04g of sodium bisulfite, strengthen the stirring, continue to stir for 1h, add water into the reaction kettle, and stir for 30min to obtain a retarder for refractory materials, named as HN-2.

Embodiment 3

[0023] Weigh 20g (0.01mol) of polybutylene adipate (molecular weight 2000), 20mL of N-methylpyrrolidone, 2.54g (0.005mol) of methylsilsesquioxane, add the in the flask. Stir at a constant speed with a stirrer, and heat up to 50°C; after the temperature of the solution in the reaction vessel reaches 50°C, add 3.4g (0.02mol) of hexamethylene diisocyanate. Then add the catalyst stannous oleate (the amount accounts for 4% of the total mass of the reaction system), keep the temperature for 1 hour after adding, then raise the temperature to 70° C., and keep the temperature for 4 hours. Add 1.04g of sodium bisulfite, strengthen the stirring, continue to stir for 1h, add water into the reaction kettle, and stir for 30min to obtain a retarder for refractory materials, named as HN-3.

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Abstract

The invention provides a retarder used in a refractory material, which is prepared by the following steps: weighing polyester polyol, silsesquioxane and diisocyanate according to the ratio, adding thepolyester polyol, the silsesquioxane and solvent N-methylpyrrolidone into a reaction container, fully stirring, heating, adding the diisocyanate, adding a catalyst, keeping the temperature and continuously stirring after the catalyst is added, and then keeping the temperature after heating to prepare a prepolymer of which the end group is -NCO; cooling, adding sodium hydrogen sulfite into the reaction container, continuously stirring, keeping the temperature, finally adding water into the reaction container, and continuously stirring, so as to obtain the retarder for the refractory material.The retarder can adjust the setting time of the refractory castable, avoids premature setting of the castable, has good operability, and can greatly reduce the construction energy consumption. Meanwhile, the retarder for the refractory material can also be used as a dispersing agent to improve the flowability of the refractory castable and reduce the consistency.

Description

technical field [0001] The invention provides a setting retarder, in particular to an additive used in refractory materials to adjust the setting time of refractory castables and prevent the castables from setting prematurely, and belongs to the technical field of refractory material additives. Background technique [0002] Generally, refractory castables containing high silica powder are relatively difficult to disperse, the main reasons are as follows: silica powder has a very fine particle size, exhibits a high specific surface area, and is extremely prone to agglomeration; the chemical composition is not stable, The content of basic oxide impurities such as sodium oxide and potassium oxide is usually high. The higher surface area and the presence of higher alkaline impurities can easily lead to shorter construction time (initial setting time) of castables, especially in summer or higher construction temperature conditions, resulting in higher The construction problems o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/42C08G18/12C08G18/66C08G18/30C04B35/10C04B35/622C04B35/634
CPCC08G18/6705C08G18/4238C08G18/12C04B35/10C04B35/622C04B35/63448C04B2235/3222C08G18/2805
Inventor 黄凯陈娜黄異张意
Owner 武汉善达化工有限公司
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