SU1787974A1 - Raw mixture for producing heat insulation - Google Patents

Description

The invention relates to building materials, in particular to compositions of raw mixtures for the production of heat-insulating materials.

A light-concrete mixture is known, including Portland cement, expanded clay sand, expanded clay gravel, an air-entraining additive and water, additionally, organic wood chippings or guzapaya fractions of 10, 20 mm and clay, in the following component ratios, wt.%:

Portland cement 2.3.0-21.0. Expanded clay sand fractions: 0.14 mm 1.0-1.9 0.14 ..... 0.35 mm 6.0-6.9 0.35 ..... 0.63 mm 80-8.9 0.63 ..... 1.0 mm 5.0--5.8 Expanded clay gravel . 27.0-30.0 Air entraining additive 0.4-0.5 Woodcrusher Crusher or guzapaya fra tions 10 ..... 20 mm 7 2.?. 68

Clay 0.8-1.32

Water Else

The closest solution to the proposed ^: technical solution 'according to the achieved results is a raw mixture for the manufacture of wood concrete based on gypsum binders, including, wt.%:

Gypsum 42-46

Wood Aggregate 25-27

Flax bonfire minced in acidic medium 4-8

Water Else

The disadvantages of the known mixtures is the high thermal conductivity of the material based on them.

The purpose of the invention is to reduce the density and thermal conductivity of the insulating material. This goal is achieved in that the raw material mixture for the manufacture of thermal insulation, including gypsum binder, organic aggregate and water, contains as a organic filler guzapayu fractions · 0.14-1.25 im and additionally foam

1787974A1 based on scrubbing paste and urea-formaldehyde resin in the following ratio of components, wt.%:

Plaster binder 49.06-56.25

Guzapaya fractions 0.14 ..... 1.25 mm. 12.5-15.9

Foaming agent based on scrubbing paste and urea-formaldehyde resin 1.56-1.89 Water Else

For the preparation of the raw mix used

a) building plaster G-4

b) a frother based on scrubber paste and urea-formaldehyde resin

Characteristics of the foaming agent: Composition, wt.%:

Scrubber paste 0.3-0.6

Urea-formaldehyde resin 0.375-1.5

Water Else

Foaming Agent Properties:

Foam ratio 47.15-75.4

The resistance of the foam, min 182-213

To prepare the foaming agent, scrubbing paste is used according to TU 381071011-76 and urea-formaldehyde resin, used as an organic binder in construction

c) Guzapaya fractions 0.14-1.25 mm

The stalks of cotton are crushed and sieved through a set of sieves with hole sizes of 0.14; 0.135; 0.63; and 1.25 mm. In the composition of the raw material mixture, fractions of 0.14-1.25 mm are used; 0.14-0.315 mm; 0.315 ~ 0.63 mm; 0.315-1.25 mm and 0.63-1.25 mm.

The raw material mixture for the manufacture of heat-insulating material is prepared as follows: in the foam generator, foam is prepared from the foaming agent solution and fed to the mixer, then pre-ground guzapaya is introduced into the foam and water and building gypsum are added with stirring, the mixture is mixed until homogeneous. The mixing time of the mixture is not more than 3-4 minutes. After obtaining a homogeneous mass, it is molded into a tile or other type of heat-insulating material, the residence time of the material in the form does not exceed two hours. The hardening of the material is carried out in vivo or after setting gypsum (2 hours after molding), the material can be subjected to artificial drying at 6070 ° C until a residual moisture content of 5% is reached. The foaming agent used has a high foam ratio and provides a finer-grained foam.

With the introduction of such a fine-grained foam in a mixture of a mineral binder and an organic filler, it promotes a more uniform distribution of solid particles in the volume of the material and the formation of a finely porous structure of the heat-insulating material.

In the proposed mixture, particles of ground guzapai play the role of a reinforcing component to increase the bending strength of the material and, at the same time, due to their porous structure, increase the porosity of the obtained heat-insulating material and, since the pores of the guzapai particles from the particle surface are blocked by a layer of gypsum mortar, they are formed in fact closed and poorly conductive .

The use of guzapai as an organic filler is also explained by the fact that the wood of cotton stalks is more uniform in structure and size of fibers, has good adhesion with minerals, and guzapai fibers are short and thin, i.e. uniform in length and thickness, and therefore allow obtaining a heat-insulating material of a more uniform structure / Such a material will have negligible thermal conductivity.

With a decrease in the size of the guzapai fraction below 0.14 mm, the water demand of the mixture increases due to an increase in the specific surface area of the particles of the organic floor’s filament, with an increase in the particle size of the guzapai above 1.25 mm, large particles and the organic filler do not contribute to the formation of a finely porous structure of the heat-insulating material. Therefore, the optimal size of the guzapaya fraction is 0.14 ... 1.25 mm.

Claims (1)

Claim The raw material mixture for the manufacture of thermal insulation, including gypsum binder, an organic filler and water, is about τη and moreover, in order to reduce the density and thermal conductivity, it contains 0.14-1 fractions as an organic filler, 25 mm and additionally a foaming agent based on scrubbing paste and urea-formaldehyde resin in the following ratio of components, wt.%: Plaster binder 49.06-56.25 Guzapaya fractions 0.14-1.25 mm 12.5-15.09. Foaming agent based on scrubbing paste and urea-formaldehyde resin 1.56-1.89 Water The table shows the costs of the components, the sizes of the guzapaya fractions and the properties of the heat-insulating material, as well as the properties of the known material Composition and properties of the mixture The proposed mixture Famous example *> '3 4 5 6 The composition of the mixture, May. % Building Plaster 56.25 54.84 53.33 51.72 50.0 49.06 Guzalaya 12.5 12.9 13.33 13.79 14.85 09/15 Foaming agent 1.56 1,61 1.67 1.73 1.79 1.89 Water 29.69 30.65 31.67 32.76 33.36 33.96 Particle size of guaalai, mm o.-o. 63 0.63-1.25 0.14-1.25 0.14-0.315 0.315-0.63 0.315-1.25 Properties of the mixture: density. kg / m ³ 690 680 640 680 665 680 710 The coefficient of thermal conductivity of the material. W / m -K 0.097 0.095 0,083 0,089 0.087 0.09G 0.14