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Polymer nano / micro particle additive and preparation method thereof

A technology of micron particles and polymers, applied in the field of admixtures for cement-based materials, can solve the problems of reducing the later strength of mortar or concrete, limiting the wide application of early strength agents, etc., to achieve the effect of improving toughness and improving early strength

Active Publication Date: 2015-11-11
北京水木佳维新材料技术研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These early strength agents can effectively improve the early strength of cement concrete, but a common disadvantage is that they will reduce the later strength of mortar or concrete to varying degrees.
This shortcoming greatly limits the wide application of accelerators in concrete.

Method used

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  • Polymer nano / micro particle additive and preparation method thereof
  • Polymer nano / micro particle additive and preparation method thereof
  • Polymer nano / micro particle additive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0050] Add 2kg of γ-methacryloxypropyltriethoxysilane to one elevated tank, add 8kg of vinylpyrrolidone to another elevated tank, and add 0.7kg of ammonium persulfate to the third elevated tank at the same time. 20kg of ionized water is added dropwise as an initiator.

[0051] Put 80kg of deionized water and 70kg of TPEG (prenyl polyoxyethylene ether, molecular weight 2400) into the reaction kettle, raise the temperature to 80 degrees, and start adding the above three components dropwise. Among them, the first two components were added dropwise for three hours, and the initiator component was added dropwise for three and a half hours. After the drop, the temperature was kept for 30 minutes. At the same time, a solution A consisting of 0.1 kg of tert-butyl hydroperoxide and 5 kg of water was added dropwise, 0.05 Solution B composed of 1 kg of sodium thiosulfate and 5 kg of deionized water was added dropwise for 2 hours, then kept warm for half an hour, cooled to below 50 degree...

Synthetic example 2

[0053] Add 5kg of deionized water and 8kg of vinylpyrrolidone (NVP) in one elevated tank, add 1.1kg of sodium persulfate and 10kg of deionized water in another elevated tank, and add components dropwise as an initiator.

[0054] Put 50kg of deionized water and 50kg of TPEG (prenyl polyoxyethylene ether, molecular weight 1000) with phosphoric acid functional groups in the reaction kettle, raise the temperature to 90 degrees, and start adding the above two components dropwise. Among them, the former component was added dropwise for three hours, and the initiator component was added dropwise for three and a half hours. After the drop, the temperature was kept for 30 minutes, and the temperature was lowered to 85 degrees. At the same time, 0.42 kg of tert-butyl hydroperoxide and 5 kg of water were added dropwise to form Solution A, 0.25 kilograms of sodium thiosulfate and 5 kilograms of deionized water form solution B, dropwise for 2 hours, then keep warm for half an hour, cool to ...

Synthetic example 3

[0056] Add 90kg of deionized water, 5kg of acrylamide, and 17kg of HPEG (isobutenyl polyoxyethylene ether, molecular weight 4000) with phosphoric acid functional groups in a high-level tank, add 68kg of styrene in another high-level tank, and at the same time in the third Add 1.1kg of sodium persulfate and 110kg of deionized water in a high position tank, and add components dropwise as an initiator.

[0057] 70kg of deionized water was dropped into the reactor, the temperature was raised to 90 degrees, and the above three components were started to be added dropwise. Among them, the first two components were added dropwise for three hours, and the initiator component was added dropwise for three and a half hours. After the drop, the temperature was kept for 30 minutes, and the temperature was dropped to 85 degrees. At the same time, 0.42 kg of tert-butyl hydroperoxide and 20 kg of water were added dropwise. The solution A that forms, the solution B that 0.25 kilograms of sodiu...

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Abstract

A polymer nano / micro particle additive is prepared from a main monomer and functional monomers by copolymerization. The functional monomers contain carboxylic group, sulfate group, sulfonate group, phosphate group, phosphite group, silane functional group, silicon hydroxyl functional group, and quaternary amine, quaternary phosphonium and tertiary sulfur functional groups; and the polymer nano / micro particle additive is a dry powder, or an aqueous dispersion. Under certain circumstances, the polymer does not contain main monomer but necessarily contains the above functional monomers. By introducing functional groups or anaphase modification, the polymer nano / micro particles have the effects of promoting hydration and nucleation of cement and greatly improving the early hydration rate of cement, so as to achieve improve the early strength of the cement-based materials and improve the toughness of cement-based materials.

Description

technical field [0001] The invention belongs to the technical field of cement-based material admixtures, in particular to a polymer nano / micro particle admixture for improving the early strength of cement-based materials and a preparation method thereof. Background technique [0002] Improving the early strength and accelerating strength growth of cement-based materials (including mortar and concrete) has always been a key technical requirement in some civil engineering. For example: in the preparation process of concrete prefabricated components, the rapid early strength growth is conducive to the rapid cycle use of formwork and improve production efficiency; the rapid growth of the strength of cement-based materials used in engineering repairs and road repair projects is required; winter low temperature Construction requires the use of special concrete admixtures to accelerate the development of concrete strength. The traditional technical measure is to add a small amount...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F226/10C08F230/08C08F212/08C08F220/56C08F220/28C08F220/06C08F220/58C08F212/14C08F230/02C08F218/08C08F218/00C08F236/06C08F226/02C08F2/26C08F2/30C04B24/16
Inventor 孔祥明蒋凌飞卢子臣
Owner 北京水木佳维新材料技术研究院有限公司
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