Retarding type liquid cement grinding aid and preparation method thereof

Technical Field

The invention belongs to the technical field of cement grinding aid, in particular relates to a setting-retarding liquid cement grinding aid and method for preparing the same.

Background Art

In the cement production process, grinding process of large power consumption, and the energy utilization rate is low, without changing the premise of grinding process, adding cement grinding aid can save energy and reduce the cost, reduce the cost; setting-retarding cement grinding aid not only can improve the grinding efficiency, at the same time, through the adjustment of the setting time of the cement, the coagulation of the concrete can be prolonged time, the relatively long time in the newly-mixed concrete to maintain the plastic, molding and casting to improve construction quality, inhibit hydration exothermic speed, slow speed and reduced heat initial heat of hydration of the cement, so as to prevent the concrete from the emergence of early temperature crack. Cement add the retarder use the production of concrete because the cement mineral ingredient early hydration speed slacken, gelled material can be more uniform distribution and full hydration, the hydrated product to be more complete and not dense, concrete exsudation and to improve anti-freezing property. Molasses commonly used on the present market, cane sugar, sugar calcium as a setting-retarding cement grinding aid in retarding ingredient, however, large consumption, effect is not good, the cost is high.

Content of the invention

The purpose of this invention is directed to the above-mentioned deficiency, and provides a small dosage, effect is good, low-cost setting-retarding cement grinding aid and method for preparing the same.

Technical solution of this invention is:a setting-retarding cement grinding aid of the press parts by mass percentage: calcium lignosulfonate: 1-2 parts, amino trimethylene phosphonic acid: 2-5 parts, three ethanolamine: 10-15 parts, triisopropanolamine: 3-5 parts, ethylene glycol: 2-3 parts, sodium hyposulfite: 15-20 parts, the rest is water.

Technical solution of this invention in the setting-retarding cement grinding aid of the preparation method is as follows: to the reaction kettle in accordance with the prescription requirements for accurate metering into the water, under stirring, adding sodium thiosulfate, calcium lignosulfonate, stirring 40 minutes, after to be entirely dissolved, then adding triethanolamine, triisopropanolamine, ethylene glycol, amino trimethylene phosphonic acid, stirring 30-60 minutes, finally through the stainless steel filter screen, to obtain the setting-retarding cement grinding aid.

The invention compared with existing cement grinding aid, has the following advantages: using amino trimethylene phosphonic acid substitute molasses, cane sugar, sugar of calcium as a cement grinding aid in halves, there is little consumption, the content of the report general slow congeals the group 5-10%, and not influenced by the temperature, , is not easy to hydrolysis and precipitation, grinding aid and other materials with good compatibility, and the concrete of the various material composition in a good adaptability, can greatly reduce the cost of the cement grinding aid; cement grinding aid of this invention is a setting-retarding cement grinding aid, the setting time of cement can be increased, and the mechanical property of the cement can be improved.

Mode of execution

Embodiment 1

The composition of the cement grinding aid of the percentage by mass parts, the water 67 parts into a reaction kettle, stirred, adding thio sodium sulfate 15 parts, lignin sulphonate 1 portions, stirring 40 minutes, after to be entirely dissolved, then adding triethanolamine 10 parts, triisopropanolamine 3 parts, ethylene glycol 2 parts, amino trimethylene phosphonic acid 2 parts, stirring 30-60 minutes, all the solid material dissolved to, and and liquid uniform mixing of materials, finally through the stainless steel filter screen, to obtain the setting-retarding cement grinding aid.

According to in table 1 each group of parts specified in repeating the implementation of the content of 1 method, different components respectively the setting-retarding cement grinding aid product.

The embodiment 1 to embodiment 5 of the setting-retarding cement grinding aid product 1 to product 5, test carry on pulverizing slightly rubs using cement, cement testing and matching, clinker 60%, gypsum 5%, limestone 20%, the fly ash 12%, slag 3%. The experimental result as shown in table 2 is shown.