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INVENTION
Russian Federation Patent RU2287505

Moldable mixture for foam

Name of the inventor: Krutikov Vyacheslav (RU); Didik Aleksey Aleksandrovich (RU); Yakovlev Grigoriy Ivanovich (RU); Kodolov Vladimir (RU); Plekhanov Tatiana
The name of the patentee: Izhevsk State Technical University
Address for correspondence: 426069, Izhevsk, ul. Student, 7, Izhevsk State Technical University
Starting date of the patent: 2005.05.03

The invention relates to building materials, namely, the raw material mixture, and can be used in the production of aerated concrete products for various purposes. The technical result is to reduce the energy consumption of building products, shrinkage minimizing and improving thermal properties of insulation products. Molding the mixture to foam contains, by weight%: 30,0-77,0 Portland cement, metal-walled carbon nanotubes 0,001-2,5, foaming agent 0.4-0.7, water - the rest.. Moreover, it may further contain 0-30 wt% filler -. Quartz sand.

DESCRIPTION OF THE INVENTION

The invention relates to building materials, namely, the raw material mixture, and can be used in the production of aerated concrete products for various purposes.

Known raw meal for the production of lightweight concrete (certificate of authorship SU №1588734, 1990), consisting of: Portland 12,0-20,0, shlakopemzovy rubble 47,0-52,0; waste refractory production 8,0-13,0; ash plants 5.0-9.0; wood-emulsified resin 0,035-0,45; waste metallurgical lime 1.0-3.0; the rest - water.

The disadvantage of this is the high thermal conductivity of the mixture, as used shlakopemzovy gravel having greater density.

The closest analog for the claimed invention is a raw material mixture for foam, comprising, by weight%: cement 33-77, carbon clusters fulleroid type 0,0001-2,0, water - the rest, and a foaming agent (RF patent №2233254, 27.07.. 2004).

An object of the invention is to reduce the energy consumption of building products and the creation of a moldable mixture to the composition, allowing to reduce the shrinkage to a minimum and increase the thermal properties of insulation products.

The invention consists in that the foam forming mixture comprising cement, water, a foaming agent, carbon nanotubes, metal-containing carbon nanotubes in the following ratio, wt.%: 30,0-77,0 cement, a foaming agent 0,4-0 7, carbon nanotube metal-metal-0,001-2,5, water - the rest. The mixture may further contain a filler -. Silica sand 0-30% by weight.

Introduction foaming in cement stone structure creates a hollow area in the form of air bubbles, said nanotubes arranged on the surface of bubbles and provide a framework for the formation of crystalline hydrates of cement, i.e. strengthen the walls of the hollow areas. bubble walls are strong and do not shrink, but also increase the insulating properties. Using quartz sand mixture increases the density and strength.

The figure shows the microstructure of foam concrete samples obtained with and without the use of metal-containing carbon nanotubes.

Clearly shows that the microstructure of the foam sample in the presence of additives was more homogeneous pore size is approximately the same as a result of the effect of "collapse" of air bubbles occurs, and the thermal conductivity of the structure decreases. The claimed invention is illustrated by examples.

example 1

The apparatus for manufacturing aerated concrete mixture is poured cement, then poured into water. In a separate container prepare a foam by mixing a foaming agent and water. Thereafter combined with cement foam solution, metal-added carbon nanotubes and gently stirred (600 r / min). Then supplying a pressurized mixture into molds metal cubes with a side of 100 mm. Metal containing carbon nanotubes obtained using the mixture of polyvinyl alcohol with copper (I) or (II), taken in the molar ratios (1.20: 1), heated to 300 ° C. Examples 3 and 4 - Samples were prepared as in Example 1, but with different content of nanotubes.

Example 2 (Reference)

Samples were prepared as in Example 1, but in the absence of metal-containing carbon nanotubes.

The prepared molding sand has minimal shrinkage after laying it into the mold, since the metal-carbon nanotubes have a high surface area and high strength characteristics. Furthermore, metal-containing nanoparticles are a structural element, as a result, settled on the surface of the film bubble, they are comparable in size material "template" for the further arrangement of the main building blocks of the cement binder crystalline, which increases the resistance of the foam concrete mixture promotes shrinkage reduction , increasing foam strength, and as a consequence, increase the thermal conductivity.

For experimental verification of the effectiveness of the claimed mixture composition of four molding compounds were prepared. All formulations including prototype are shown in Table 1 below. The results of each test composition, namely, shrinkage values ​​after aging the mixture of products in vivo for 24 hours, the thermal conductivity at 28 days after natural age hardening are listed in Table 1 below.

These data show that the aerated concrete products obtained from the mixture proposed formulations have small curing shrinkage and reduced thermal conductivity. Use of the invention allows to obtain products of aerated concrete non-autoclave curing without the use of the energy-intensive process as autoclaving.

CLAIM

1. Moulding mixture for foam comprising cement, a foaming agent, water and carbon nanotubes, characterized in that it comprises a metal-walled carbon nanotubes, with the following component ratio, wt.%:

2. Moulding mixture according to claim 1, characterized in that it further comprises 0-30 wt% filler -. Quartz sand.

print version
Publication date 17.01.2007gg

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