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Preparation method of sustained-release water reducer microcapsule

A technology of water reducer and microcapsules, which is applied in the field of preparation of slow-release water reducer microcapsules, to achieve the effects of large controllability, high concentration of water reducer, and simple preparation process

Active Publication Date: 2012-02-15
哈尔滨强石新材料技术开发股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the application of this technology to the preparation of slow-release superplasticizers.

Method used

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  • Preparation method of sustained-release water reducer microcapsule
  • Preparation method of sustained-release water reducer microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 2g of polycarboxylate superplasticizer and toluene containing 40g of lauryldiethanolamide were ultrasonically mixed to obtain a homogeneous solution. Simultaneously add 40g monomer (acrylic acid, styrene, the mixture of methyl acrylate and sodium isocyanate, the mass ratio of each component is 2:60:6:3) and 10g BPO / DMA react at 30 ℃ for 4 hours, the reaction After the heat preservation is completed for 8 hours, the temperature is lowered and cooled to obtain the slow-release superplasticizer microcapsules.

[0023] The particle size of the slow-release superplasticizer microcapsules was tested to be 830nm under acidic conditions, and the dispersion index was 0.134; under high alkaline environment, it was 1382nm, with multimodal distribution. The results of centrifugation analysis showed that 83% of the water reducer molecules were released within 4 hours.

Embodiment 2

[0025] 10g of aliphatic high-efficiency water reducer and cyclohexane containing 20g of fatty alcohol polyoxyethylene ether were ultrasonically mixed to obtain a homogeneous solution. Simultaneously add 150g monomer (the mixture of ammonium acrylate, styrene, lauryl methacrylate and silane, the mass ratio of each component is 10:400:300:26) and 40g organic cumene hydroperoxide / carved white powder React at 50°C for 6 hours, keep warm for 4 hours after the reaction, and cool down to obtain slow-release superplasticizer microcapsules.

[0026] The particle size of the slow-release water reducer microcapsules was tested to be 1230nm under acidic conditions, and the dispersion index was 0.152; under high alkaline environment, it was 1842nm, with multimodal distribution. The results of centrifugation analysis showed that 78% of the water reducer molecules were released within 4 hours.

Embodiment 3

[0028] 30g of naphthalene-based superplasticizer was ultrasonically mixed with methylene chloride containing 40g of polyoxyethylene sorbitan monolaurate and 40g of lauryl amidopropyl amine oxide to obtain a uniform solution. Simultaneously add 300g monomer (the mixture of ammonium acrylate, ammonium methacrylate, styrene, methyl methacrylate and melamine, the mass ratio of each component is 20:10:600:500:46) and 30g persulfuric acid The salt / thiosulfate was reacted at 60°C for 5 hours, and after the reaction was completed, the temperature was kept for 8 hours, and the temperature was lowered to cool down to obtain the slow-release superplasticizer microcapsules.

[0029] The particle size of the slow-release superplasticizer microcapsules tested was 625nm under acidic conditions, and the dispersion index was 0.092; it was 842nm under high alkaline environment, with multimodal distribution. The results of centrifugation analysis showed that 74% of the water reducer molecules we...

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Abstract

The invention discloses a preparation method of a sustained-release water reducer microcapsules which belong to the technical field of building material additives. By miniemulsion inverse phase polymerization, common water reducer molecules undergo microencapsulation and the water reducer microcapsules which have a pH response function are synthesized. After polymerization is finished, the microcapsules are in an acidic condition. due to the existence of capsule shells, the water reducer molecules can stably stay in the microcapsules. After the microcapsules are mixed with cement, cement concrete is strongly alkaline and the microcapsules perform a response-stimulus behavior under a high pH condition. Large molecular chains of the capsule shells rapidly expand and extend so as to generatethe swelling phenomenon. The compact shell layer becomes loose, and the cladded water reducer molecules slowly release such that the concentration of the water reducer is always high in the cement concrete. Therefore, the fluidity etentivity with time of the water reducer can be raised, and the collapsed slump loss of cement concrete in practical engineering usage can be prevented.

Description

technical field [0001] The invention belongs to the technical field of building material admixtures, and in particular relates to a preparation method of slow-release water reducer microcapsules. Background technique [0002] Concrete is currently the most widely used building material. Concrete admixture is the sixth component in concrete except cement, sand, stone, water, and mineral admixtures. It plays a very important role in the application of high performance concrete. , in the development process of concrete technology, the invention and application of high-efficiency water reducer is recognized as the third technological leap in the field of concrete technology after reinforced concrete and prestressed reinforced concrete technology. As a kind of admixture, high-efficiency water reducer is used in the largest amount, and its mixing amount is not more than 5% of the cement mass. It mainly plays three different functions: (1) Improve the pourability of concrete. (2) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26B01J13/14C04B103/30
Inventor 孔祥明吴纯超张珍林
Owner 哈尔滨强石新材料技术开发股份有限公司
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