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Method for preparing polycarboxylate-type high-performance water reducing agent by using combined macro-monomer

A polycarboxylic acid-based, macromonomer technology, applied in the field of concrete admixtures, can solve the problems of complex production process, many types of raw materials, and low efficiency, and achieve the effects of wide source of raw materials, reduced production costs, and simple process

Inactive Publication Date: 2013-03-20
MAANSHAN CHINASEA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical solution of this invention still has the problems of many kinds of raw materials, complicated production process, low efficiency and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing a polycarboxylic acid-based high-performance water reducer by using combined macromonomers, comprising the following steps:

[0048](1) Accurately weigh 50.7 kg and 151.8 kg of isopentenyl polyoxyethylene ether with a molecular weight of 2400 and 1200 respectively as a macromonomer, dissolve it in 202.5 kg of water, raise the temperature to 58 ° C, stir, and form a large Aqueous solution of monomer mixture.

[0049] (2) Add 1.8 kg of hydrogen peroxide (35% by mass) to the macromonomer mixture obtained in step (1), and stir.

[0050] (3) Mix acrylic acid, mercaptopropionic acid and water to form material A; weigh 96.9kg of material A according to the proportion of acrylic acid, mercaptopropionic acid and water of 25:1:50.

[0051] (4) Add 80 kg of an aqueous solution of vitamin C (the concentration of vitamin C is 1%) to the macromonomer mixture dropwise; 135min and 165min.

[0052] (5) After the dropwise addition, keep at 58°C for 1 h.

[0053...

Embodiment 2

[0056] A method for preparing a polycarboxylic acid-based high-performance water reducer by using combined macromonomers, comprising the following steps:

[0057] (1) Accurately weigh 135 kg and 270 kg of isopentenyl polyoxyethylene ether with a molecular weight of 2400 and 1200 respectively as a macromonomer, dissolve it in 331.4 kg of water, raise the temperature to 65 ° C, stir, and form a large Aqueous solution of monomer mixture.

[0058] (2) Add 2.78 kg of hydrogen peroxide (35% by mass) to the macromonomer mixture obtained in step (1), and stir.

[0059] (3) Mix acrylic acid, mercaptopropionic acid and water to form material A; weigh 194.5kg of material A according to the proportion of acrylic acid, mercaptopropionic acid and water of 25:1:50.

[0060] (4) Add 177kg of an aqueous solution of vitamin C (the concentration of vitamin C is 1%) to the macromonomer mixture dropwise; then add the material A in step (3) dropwise to the macromonomer mixture, and the dropping ti...

Embodiment 3

[0065] A method for preparing a polycarboxylic acid-based high-performance water reducer by using combined macromonomers, comprising the following steps:

[0066] (1) Accurately weigh 303.8 kg and 101.2 kg of isopentenyl polyoxyethylene ether with a molecular weight of 2400 and 1200 respectively as a macromonomer, dissolve it in 270kg of water, raise the temperature to 60°C, and stir to form a macromonomer Aqueous solution of body mixture.

[0067] (2) Add 4.5 kg of hydrogen peroxide (35% by mass) to the macromonomer mixture obtained in step (1), and stir.

[0068] (3) Mix acrylic acid, mercaptopropionic acid and water to form material A; weigh 127.4kg of material A according to the proportion of acrylic acid, mercaptopropionic acid and water of 25:1:50.

[0069] (4) Add 118 kg of an aqueous solution of vitamin C (the concentration of vitamin C is 1%) to the macromonomer mixture dropwise; then add the material A in step (3) dropwise to the macromer mixture, and the dropping t...

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Abstract

The invention discloses a method for preparing a polycarboxylate-type high-performance water reducing agent by using a combined macro-monomer, and belongs to the technical field of a concrete admixture. The method comprises the following steps of: (1) accurately weighing isopentenyl polyoxyethylene ether with molecular weights being 2400 and 1200 as macro-monomers, wherein mass ratio of the two macro-monomers is 1-9: 3; increasing the temperature to 58-65 DEG C, and stirring; (2) adding hydrogen peroxide and stirring; (3) mixing acrylic acid and mercaptopropionic acid with water to obtain a material A; (4) dropwise adding a water solution of vitamin C into the macro-monomer mixture; and dropwise adding the material A prepared in the step (3); (5) after adding of the material A, keeping the temperature at 58-65 DEG C for 1-3h; and (6) cooling the mixed solution to be lower than 40 DEG C, and regulating pH value to 4-6. The method for preparing the polycarboxylate-type high-performance water reducing agent by using the combined macro-monomer has the advantages that the raw material source is wide, the process is simple and synthesis time is short, production cost is reduced greatly, and performance is table.

Description

technical field [0001] The invention belongs to the concrete admixture technology, and more specifically relates to a method for preparing a polycarboxylic acid-based high-performance water reducer by using a combined macromonomer. Background technique [0002] Concrete admixtures have become one of the indispensable components of concrete. In recent decades, great progress has been made in concrete preparation and construction technology at home and abroad, and the application of various concrete such as high performance concrete and self-compacting concrete is increasing. The wider the application, the higher the requirements for concrete admixtures. Polycarboxylate high-performance water reducer has the characteristics of low dosage, high water reducing rate, small loss of concrete slump over time and good adaptability to different cements. Polycarboxylate high-performance water reducer represents the future development direction of concrete admixture due to its excellen...

Claims

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Application Information

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IPC IPC(8): C08F283/06C04B24/26C04B103/30
Inventor 何宝国佘祥海俞光海金文娟
Owner MAANSHAN CHINASEA NEW MATERIAL
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