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Preparation method of nano-photocatalytic admixture for cement-based material

A cement-based material and nano-light technology, which is applied in the field of preparation of nano-photocatalytic admixtures for cement-based materials, can solve problems such as inability to disperse, unfavorable development of cement-based materials' fluidity and mechanical properties, and loss of photocatalytic performance. To achieve the effect of improving crack resistance and mechanical properties, good and long-term stable photocatalytic function, and avoiding adverse effects

Inactive Publication Date: 2010-05-12
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, cement-based materials have good construction operation, mechanical properties and durability; on the other hand, they can photocatalytically oxidize pollutant gases in the atmosphere and have environmental protection functions. Existing nano-photocatalytic materials are easy to agglomerate and cannot be effectively dispersed in cement-based materials, and are easily wrapped by cement hydration products and lose good photocatalytic performance, and are also very detrimental to the flow properties and properties of cement-based materials. Development of mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Mix nano-titanium dioxide mixed crystals and activated carbon at a weight ratio of 1:1 for 2 hours to obtain a nano-photocatalytic material supported by activated carbon.

[0013] (2) The nano-photocatalyst material and vinyl chloride, ethylene and lauroyl vinyl ester ternary copolymerization compound redispersible latex powder, polycarboxylate water reducing agent and polypropylene fiber after activated carbon loading are by weight 1: 0.3: The ratio of 0.05:0.005 was continued to mix for 2 hours to obtain the nanometer photocatalytic admixture used in cement-based materials.

[0014] (3) Mix 42.5-grade ordinary Portland cement with the nano-photocatalytic admixture prepared in this example at a weight ratio of 1:0.25, and add an appropriate amount of water to adjust it into a slurry that is easy to paint, and paint it on the sintered porous surface. The surface of the brick is cured for 7 days after hardening and forming a film.

[0015] The photocatalytic cement ...

Embodiment 2

[0017] (1) Mix nano-titanium dioxide mixed crystals and activated carbon at a weight ratio of 1:0.75 for 1.5 hours to obtain a nano-photocatalytic material supported by activated carbon.

[0018] (2) The nano-photocatalytic material supported by activated carbon and the ternary copolymer compound of vinyl chloride, ethylene and lauroyl vinyl ester redispersible latex powder, naphthalene-based water reducer and polypropylene fiber in a weight ratio of 1:0.25:0.05 : 0.005 ratio to continue mixing for 1.5h to obtain the nanometer photocatalytic admixture used in cement-based materials.

[0019] (3) Mix 42.5 grade ordinary Portland cement, the nano-photocatalytic admixture prepared in this example and water, sand and stone according to the weight ratio of 1: 0.25: 0.61: 1.97: 3.51 to make photocatalytic concrete, After 12 days of standard curing, air dry for 2 days.

[0020] The cement-based material can be used under simulated sunlight conditions (the light intensities of 254nm,...

Embodiment 3

[0022] (1) Mix nano-titanium dioxide mixed crystals and activated carbon at a weight ratio of 1:1 for 1.5 hours to obtain a nano-photocatalytic material supported by activated carbon.

[0023] (2) The nano-photocatalyst material and vinyl chloride, ethylene and lauroyl vinyl ester ternary copolymerization compound redispersible latex powder, polycarboxylate water reducer and polypropylene fiber after activated carbon loading are by weight 1: 0.25: The ratio of 0.05:0.006 was continued to mix for 1.5h to obtain the nanometer photocatalytic admixture used in cement-based materials.

[0024] (3) Mix 42.5-grade ordinary Portland cement, the nano-photocatalytic admixture prepared in this example, water, and quartz sand in a weight ratio of 1:0.25:0.69:2.5 to make photocatalytic mortar and paint it in the indoor garage Wall surface, natural curing for 14 days.

[0025] The cement-based material can be used under indoor conditions (the light intensities of 254nm, 290nm, 365nm and 42...

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Abstract

The invention discloses a preparation method of nano-photocatalytic admixture for cement-based material, comprising the following steps: nanometer titanium dioxide mixed crystal is mixed with active carbon according to the weight ratio of 1:1-2 for 1-2 hours to obtain nano-photocatalytic material loaded with active carbon; then, the nano-photocatalytic material loaded with active carbon, dispersible emulsion powder, water reducer and polypropylene fiber are mixed according to the weight ratio of 1:0.2-0.3:0.04-0.06:0.004-0.006 for 1-2 hours. The invention has simple preparation technology, and prepared nano-photocatalytic admixture for cement-based material has long-term and stable photocatalytic function, and can improve flow property, adhesive property and anti-cracking property of concrete. The nano-photocatalytic admixture not only can be mixed with cement to obtain photocatalytic cement paste which is cement-based photocatalytic paint convenient to paint, but also can be mixed with cement and sand to prepare cement mortar to form cement-based photocatalytic coating with certain thickness on the concrete surface.

Description

technical field [0001] The invention relates to a preparation method of a nanometer photocatalytic admixture for cement-based materials. Background technique [0002] As one of the most commonly used engineering materials, cement-based materials are gradually developing in the direction of high performance and multifunctionality, such as thermal insulation, light weight and high strength. However, on the one hand, cement-based materials have good construction operation, mechanical properties and durability; on the other hand, they can photocatalytically oxidize pollutant gases in the atmosphere and have environmental protection functions. Existing nano-photocatalytic materials are easy to agglomerate and cannot be effectively dispersed in cement-based materials, and are easily wrapped by cement hydration products and lose good photocatalytic performance, and are also very detrimental to the flow properties and properties of cement-based materials. Development of mechanical ...

Claims

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Application Information

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IPC IPC(8): C04B24/26
CPCC04B2111/00827C04B2103/0079C04B2111/00086C04B2111/00482C04B2103/302C04B2103/0019C04B2111/00008C04B20/1066C04B2111/0025C04B40/0046C04B2111/343C04B28/02
Inventor 孟涛余亚超张津践朱蓬莱詹树林钱晓倩陈连禄
Owner ZHEJIANG UNIV
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