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A solid polycarboxylic acid water reducer and a preparing method thereof

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixtures, can solve the problems of increased viscosity of the polymerization system, prolonged production cycle, increased production energy consumption, etc., and achieves short reaction cycle, low production cost, and energy saving. Effect

Inactive Publication Date: 2017-06-20
重庆石博士新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the temperature of the bulk polymerization method is relatively high. Production at this temperature increases and adjusts the temperature, resulting in a longer production cycle, increased production energy consumption, and increased costs. In addition, higher polymerization temperatures are prone to increase the viscosity of the polymerization system. Phenomenon of local implosion

Method used

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  • A solid polycarboxylic acid water reducer and a preparing method thereof
  • A solid polycarboxylic acid water reducer and a preparing method thereof
  • A solid polycarboxylic acid water reducer and a preparing method thereof

Examples

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preparation example Construction

[0033] The preparation method of this kind of solid polycarboxylate water reducer includes: adding unsaturated double bond carboxylic acid small monomer, initiating oxidant, initiating reducing agent and chain transfer agent to the molten unsaturated polyoxyethylene ether macromonomer , the polymerization reaction is carried out at 40-50°C.

[0034] In this embodiment, in order to control energy consumption, the melting temperature of the unsaturated polyoxyethylene ether macromonomer is set at 40-60°C. After the unsaturated polyoxyethylene ether macromonomer is completely melted, first cut off the heat source, and wait until the unsaturated polyoxyethylene ether macromonomer is completely melted. The temperature of the saturated polyoxyethylene ether macromonomer is lowered to 40-50°C, and then other reagents are added.

[0035] It should be noted that the above-mentioned preparation method includes many possibilities, and is not limited to the following ones in this implemen...

Embodiment 1

[0045] The preparation reagents for the solid polycarboxylate water reducer provided in this example are: 400 g of methallyl alcohol polyoxyethylene ether, 55 g of acrylic acid, 5 g of ammonium persulfate, 1 g of ascorbic acid, and 3 g of mercaptopropionic acid.

[0046] The preparation method of the solid polycarboxylate water reducer provided in this example is as follows: put 400 g of methallyl alcohol polyoxyethylene ether in a reaction kettle, heat up to 55° C. to melt, and then cut off the heat source. When the temperature of methallyl alcohol polyoxyethylene ether drops to 50°C, add 25g of acrylic acid and fully stir for about 20 minutes, then add 5g of ammonium persulfate, continue stirring for 10-20 minutes, and wait until the temperature in the reaction kettle is 45°C , start to drop the mixed solution of 30g acrylic acid, 1g ascorbic acid and 3g mercaptopropionic acid, the dropping time is 3h, keep warm for 1h after the dropping is completed, and after the discharge ...

Embodiment 2

[0048] The preparation reagents of the solid polycarboxylate water reducer provided in this example are: 400 g of prenol polyoxyethylene ether, 55 g of methacrylic acid, 4.5 g of ammonium persulfate, 1.2 g of sodium bisulfite, and 2 g of thioglycolic acid.

[0049] The preparation method of the solid polycarboxylate water reducer provided in this example is as follows: put 400 g of prenol polyoxyethylene ether in a reaction kettle, heat up to 55° C. to melt, and then cut off the heat source. When the temperature of prenol polyoxyethylene ether drops to 50°C, add 20g of methacrylic acid and fully stir for about 20min, then add 4.5g of ammonium persulfate, continue stirring for 10-20min, and wait until the temperature in the reaction kettle is 45 At about ℃, start to drop the mixed solution of 35g of methacrylic acid, 1.2g of sodium bisulfite and 2g of mercaptoacetic acid. The time of dropping is 3h. Polycarboxylate superplasticizer.

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Abstract

The invention relates to the technical field of concrete admixtures, and provides a solid polycarboxylic acid water reducer and a preparing method thereof. The water reducer is mainly prepared from an unsaturated polyoxyethylene ether macromonomer, an unsaturated double-bond carboxylic acid type low-molecular-weight monomer, an initiating oxidant, an initiating reductant and a chain transferring agent according to a mass ratio of 400:(45-55):(3-10):(0.6-2.5):(2-3) at 40-50 DEG C. Water reduction and slump loss resistant properties of the water reducer are equivalent to those of traditional liquid polycarboxylic acid water reducers. The method includes adding the unsaturated double-bond carboxylic acid type low-molecular-weight monomer, the initiating oxidant, the initiating reductant and the chain transferring agent into the melt unsaturated polyoxyethylene ether macromonomer, and performing polymerization at 40-50 DEG C. The synthetic temperature of the method is relatively low, energy consumption is low and a preparing cost is low.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a solid polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The production concentration of polycarboxylate superplasticizer is generally 20% to 50% (mass fraction), which is not suitable for storage and transportation, which limits its wider application. Powder polycarboxylate superplasticizer only brings convenience to long-distance transportation And cost advantages, more importantly, after the polycarboxylate water reducer is powdered, its application range is greatly expanded, such as dry-mixed mortar, press grout and other construction products. [0003] At present, most of the industrially produced polycarboxylate superplasticizers are in a liquid state, and the production consumes a lot of energy. However, commercially available powder polycarboxylate superplasticizers need to be atomized and dried at high temperatures...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F4/40C04B24/26C04B103/30
CPCC08F283/065C04B24/2605C04B2103/0059C04B2103/302C08F4/40C08F220/06
Inventor 陈杰邓妮方世昌皮永奇田应兵
Owner 重庆石博士新材料有限公司
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