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Slump retaining polyocarboxy acid superplasticiser

A technology of superplasticizer and type polycarboxylate, which is applied in the field of concrete admixture, can solve the problem of low water-reducing rate of polycarboxylate superplasticizer and achieve high slump

Active Publication Date: 2009-02-04
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polycarboxylate superplasticizer prepared by this method has a very low water-reducing rate, and there is a large room for improvement.

Method used

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  • Slump retaining polyocarboxy acid superplasticiser
  • Slump retaining polyocarboxy acid superplasticiser
  • Slump retaining polyocarboxy acid superplasticiser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 45.0g of A-1, 7.5g of itaconic acid, and 100.0g of deionized water into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, stir and heat up to 80°C, and dropwise add 22.5g of 10% Aqueous solution of ammonium persulfate and monomer aqueous solution composed of 90.0g of B-1, 7.5g of methacrylic acid, 0.80g of 2-mercaptopropionic acid and 45.0g of water, the dropping time is controlled at 120 minutes and 90 minutes respectively, and the reaction The temperature is controlled at 78-82°C. After the dropwise addition, keep the temperature at 78-82°C for about 60 minutes to complete the polymerization reaction. After the heat preservation is finished, cool down to below 50° C. and add 27.0 g of 30% NaOH to obtain the polycarboxylate superplasticizer PC-1 of the present invention, which has a solid content of 45.4% and a weight average molecular weight of 22,500.

Embodiment 2

[0040] Add 82.5g of A-3, 9.0g of itaconic acid, and 120.0g of deionized water into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 90°C; at the same time, dropwise add 22.5g of 10% Sodium persulfate aqueous solution and monomer aqueous solution composed of 48.0g of B-4, 10.5g of acrylic acid, 0.60g of 3-mercaptopropionic acid and 65.0g of water, the dropping time is controlled at 120 minutes and 90 minutes respectively, and the reaction temperature is controlled At 88-92°C. After the dropwise addition, keep the temperature at 88-92°C for about 60 minutes to complete the polymerization reaction. After the heat preservation is finished, cool down to below 50°C and add 37.9g ​​of 30% NaOH to obtain the polycarboxylate superplasticizer PC-2 of the present invention, which has a solid content of 40.0% and a weight-average molecular weight of 25,000.

Embodiment 3

[0042]Add 67.5g of A-4, 3.0g of itaconic acid, and 120.0g of deionized water into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 70°C; at the same time, dropwise add 22.5g of 10% Potassium persulfate aqueous solution and monomer aqueous solution composed of 67.5g of B-2, 12.0g of methacrylic acid, 1.20g of mercaptoacetic acid and 70.0g of water, the dropping time was controlled at 120 minutes and 90 minutes respectively, and the reaction temperature was controlled at 68 ~72°C. After the dropwise addition, keep the temperature at 68-72°C for about 60 minutes to complete the polymerization reaction. After the heat preservation finishes, cool down to below 50°C and add 24.8g of 30% NaOH to obtain the polycarboxylate superplasticizer PC-3 of the present invention, with a solid content of 40.4% and a weight-average molecular weight of 16,500.

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Abstract

The invention discloses a slump maintaining type poly carboxylic acid superplasticizer, and the poly carboxylic acid superplasticizer is prepared by taking, according to the weight percentage, 10 to 60 percent of unsaturated polyalkylene glycol ether, 30 to 80 percent of alkoxy polyalkylene glycol ether (methyl) acrylic ester, 3 percent to 12 percent of unsaturated monocarboxylic acid or the salt and 2 percent to 8 percent of itaconic acid or the salt as the copolymerization monomers and carrying out the free radical copolymerization at the reaction temperature of 60 DEG C to 95 DEG C and in the presence of a free radical initiator and a chain transfer agent. The slump maintaining type poly carboxylic acid superplasticizer has the advantage of maintaining the high slump under the condition of low mixing amount.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a slump-maintaining polycarboxylate superplasticizer. Background technique [0002] The development of cement plasticizers (also known as water reducers) has a long history. In 1935, E.W. Scripcher of the United States first developed a plasticizer with lignosulfonate as the main component, which was widely used in C20-C40 concrete, promoting the development of concrete to medium strength; in 1962, Japan successfully developed naphthalene sulfonate Acid-formaldehyde condensate high-efficiency water-reducer, this type of water-reducer has the advantages of low production cost and good water-reducing effect, so it is widely used in C30-C60 concrete, promoting the development of concrete to high strength. However, the slump loss of the prepared concrete is fast, which cannot meet the construction requirements such as pumping, and cannot be used to prepare high-performance concrete. [0003]...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B103/32
CPCC04B24/2688C04B2103/32
Inventor 冯中军傅乐峰郑柏存王玲芳
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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