A kind of preparation method of polycarboxylate superplasticizer synthesized at room temperature and wide temperature range

A technology of polycarboxylic acid and wide temperature range, which is applied in the field of building materials, can solve problems such as product quality fluctuations, and achieve the effects of small fluctuations in product performance, stable product performance, and high water-reducing rate

Active Publication Date: 2017-10-24
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method for synthesizing polycarboxylate superplasticizer at room temperature and wide temperature range in view of the shortcomings of the above-mentioned prior art, which solves the problem of environmental temperature changes when synthesizing polycarboxylate superplasticizer at room temperature. And the problem of product quality fluctuation caused by temperature rise in the reaction process, can synthesize polycarboxylate high-performance water reducer with high water reducing rate, good slump retention performance, and stable product performance

Method used

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  • A kind of preparation method of polycarboxylate superplasticizer synthesized at room temperature and wide temperature range

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Embodiment 1

[0025] A preparation method for synthesizing a polycarboxylate water reducer in a wide temperature range at room temperature, the steps are as follows:

[0026] 1) In a 500ml four-necked flask equipped with a thermometer, a pH meter, a stirrer and a peristaltic pump flowmeter, add 160g of deionized water and 150g of methallyl alcohol polyoxyethylene ether in turn, stir until dissolved, and obtain a reactant solution ;

[0027]2) Measure the temperature of the reactant solution in the reaction kettle in step 1) to be 0° C., select hydrogen peroxide and azobisisobutylamidine hydrochloride as the oxidizing agent, and ferric gluconate and sodium dithionite as the reducing agent;

[0028] 3) Continue to add a mixed aqueous solution containing 3g of hydrogen peroxide and 1.5g of azobisisobutylamidine hydrochloride into the reactor (the amount of water in the solution should be just enough to dissolve the oxidant), and then add 5g of acrylic acid and an appropriate amount of sulfuric...

Embodiment 2

[0033] A preparation method for synthesizing a polycarboxylate water reducer in a wide temperature range at room temperature, the steps are as follows:

[0034] 1) In a 500ml four-necked flask equipped with a thermometer, a pH meter, a stirrer and a peristaltic pump flowmeter, add 160g of deionized water and 150g of methallyl alcohol polyoxyethylene ether in turn, stir until dissolved, and obtain a reactant solution ;

[0035] 2) Measure the temperature of the reactant solution in the reaction kettle in step 1) to be 5° C., select hydrogen peroxide and azobisisobutylamidine hydrochloride as the oxidizing agent, and ferric gluconate and sodium dithionite as the reducing agent;

[0036] 3) Continue to put 0.8g of hydrogen peroxide and 0.8g of azobisisobutylamidine hydrochloride mixed solution into the reaction kettle, then add 4g of acrylic acid and an appropriate amount of sulfuric acid, so that the initial pH of the reaction system is 3;

[0037] 4) Continue to drop the mixed...

Embodiment 3

[0041] A preparation method for synthesizing a polycarboxylate water reducer in a wide temperature range at room temperature, the steps are as follows:

[0042] 1) In a 500ml four-neck flask equipped with a thermometer, a pH meter, a stirrer and a peristaltic pump flowmeter, add 180g of deionized water and 150g of methallyl alcohol polyoxyethylene ether in turn, stir until dissolved, and obtain a reactant solution ;

[0043] 2) Measure the temperature of the reactant solution in the reaction kettle in step 1) to be 10°C, select hydrogen peroxide and azobisisobutylamidine hydrochloride as the oxidizing agent, and ferric gluconate and sodium dithionite as the reducing agent;

[0044] 3) Continue to put 1g of hydrogen peroxide and 0.5g of azobisisobutylamidine hydrochloride mixed solution into the reaction kettle, then add 3g of acrylic acid and an appropriate amount of sulfuric acid, so that the initial pH of the reaction system is 4;

[0045] 4) Continue to drip the mixed solu...

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Abstract

The invention discloses a preparation method of synthesis of a polycarboxylate superplasticizer at room temperature in wide temperature range. The preparation method comprises the steps of 1) mixing polyether macromonomer with water to obtain a reactant solution; 2) measuring temperature of the reactant solution, and selecting an oxidizing agent and a reducing agent according the temperature of the reactant solution; 3) putting an oxidant solution into the reactant solution, then dropwise adding comonomer and the reducing agent, keeping the pH value of a reaction system to 2 to 12 by using acid or alkali according the temperature of the reaction system, the dripping time of the comonomer is 0.5 to 1.5h, the dripping time of the reducing agent is 0.5 to 2h, continuously reacting for 0.5 to 1h after dripping, so as to obtain the polycarboxylate superplasticizer. According to the preparation method disclosed by the invention, the fluctuation of product quality caused by the change of environment temperature and the temperature rise in a reaction process is avoided when the polycarboxylate superplasticizer is synthesized at room temperature, and a high-performance polycarboxylate superplasticizer with high water-reducing rate, good slump loss resistant property and stable product performance can be synthesized between 0 to 50 DEG C.

Description

[0001] Field [0002] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing a polycarboxylate water reducer synthesized at room temperature and in a wide temperature range. Background technique [0003] With the rapid development of modern concrete technology towards high performance and green direction, concrete admixtures are also rapidly undergoing product upgrading. Polycarboxylate superplasticizer has a series of advantages such as strong molecular design, high water reducing rate, good slump retention performance, and high curing strength, and has quickly become a mainstream product in the market. In recent years, with the depletion of energy and the deterioration of the environment, the government has rapidly promoted energy conservation and environmental protection policies and the concept of low-carbon economy. Green production of polycarboxylate superplasticizers has become the focus of scientific and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F220/58C08F4/40C04B24/32
CPCC04B24/32C04B2103/302C08F4/40C08F283/065C08F220/06
Inventor 赵日煦汪金文杨文毕耀郑广军李兴邢菊香王少峰熊龙
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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