SU1178742A1 - Method of manufacturing sound-proof articles - Google Patents

Abstract

A method of manufacturing heat-insulating products made from a mixture of mineral fiber, filler and binder, which includes the steps of preparing foam, mixing it with mineral fiber and filler, molding and heat treatment, characterized in that, in order to reduce molding moisture, increase strength and heat-sound insulation, it will be rodent and heat-insulating. products, the foam is first prepared with a multiplicity of 4–8 by mixing water with a frother and a stabilizer, and then the foam is successively mixed with mineral fiber apolnitelem, which is used as a time steklrpor (A mer particles 0.3-2 mm. with

Description

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The invention relates to building materials and can be used in the manufacture of heat and sound insulating products based on mineral fibers and various binders.

The purpose of the invention is to reduce molding moisture, increase strength and heat and sound insulation properties.

The preparation of foam and water, a frother and a stabilizer (without a binder) makes it possible to obtain a foam with a multiplicity of 4-8 or more.

The introduction of a stabilizer into an aqueous solution of the foaming agent makes it possible to obtain a stable foam. A polyvinyl acetate dispersion (PVAD), carboxyl methylcellulose (CMC), polyacrylamide, and other water-soluble polymers can be used as a stabilizer. These polymeric additives significantly increase the adhesion of the multilayer to the fibers, which leads to an additional increase in the strength of the products.

The use of foam with a multiplicity of 4-8 allows the mineral fibers to be evenly distributed in the junction 1, which does not have a large specific surface area, throughout the volume of the foam. Foaming is carried out with the help of foaming agents of anionic surface-active substances (SAS) such as sulfonol, tipol.

The introduction of mineral fibers into the foam contributes to the splitting of the latter into individual fibers, their uniform distribution throughout the volume of the foam and thereby obtaining a resistant foam-fiber mass. Thus, the entire foam is saturated with mineral fibers. The saturation density of the foam is controlled by the ratio of the foam and the density of the injected fiber. The basic properties of the heat-insulating and sound-absorbing materials obtained depend on the density of the foam. With a high density, the material has a fibrous structure, with a small one - a ceist. The optimum is such a density at which a material with a cellular-granular structure is obtained, at which the material acquires high physicomechanical properties at

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high porosity. This is achieved using conventional density fiber (50-200 kg / m),

The dry mineral in the slurry injected into the foam mass is evenly distributed between the air bubbles in the water foams and on the mineral fibers.

Thanks to hydration and hydrolysis

mineral water is gradually removed from the layers and, due to coagulation-crystallization structure formation, the mass acquires mechanical strength, which increases with further heat treatment. Cements, lime, gypsum, and clays can be used as minerals in the living.

The introduction of glass granules in

the mixture is the last one due to its ability to intensively suck off excess water from the foam mass, otherwise it would lead to premature quenching of the foam

and, as a consequence, an increase in the density of products. Replacing finely ground sand with a glass-pore with a low bulk density (20-60 kg / m) reduces the density of the material and increases its heat and sound insulation properties. Properties of glass fiber (porosity of 95-98%) - intensively sucking water out of foam mass leads to a reduction in the setting time and hardening of the mixture, as well as to an increase in strength, since the water enters the mortar through the pores inside the granules, which subsequently leads to the formation of a monolithic bond ,

Based on experimental studies, the feasibility of using glass fiber particles of 0.5–2 mm was established, since the use of glass fiber with a particle size larger than 2 mm leads to a decrease in the mechanical strength of the material, and less than 0.5 mm to a decrease in the effect of water suction.

The skeleton of the material is formed of mineral fibers, which provide sufficient rigidity and strength, and mineral fibers increase the bending strength of products. Such a method of manufacturing heat insulating and sound-absorbing masses makes it possible to drastically reduce the amount of water in the system to values close to the theoretically necessary

for hydration in the ghost. Therefore, the material is characterized by extremely low values of capillary porosity, high density of interporous partitions, closed air pores, small deformation of their dense and smooth pore surface, and consequently, high physical and mechanical properties.

Example. The manufacture of heat insulating sound-absorbing materials is carried out according to the following technology: foam is prepared with a multiplicity of 4-8 by mixing 60% of water (by weight of all dry components), 1.2% polyvinyl acetate dispersion and 0.4% of a foaming agent sulfonol in a propeller mixer at 600 rpm, mineral wool 20-40 mm in size is added to the foam with constant stirring, then dry gypsum plaster is poured into the resulting foamy fiber, pp. Clopor and mixing is continued

until a homogeneous mineralized mass is obtained. Prepared in this way the mixture is molded, incubated for 60 minutes and dried for 6 h at 60 ° C.

Steklopor is a material with a porosity of 95-98% (communicating pores mostly dominate) and a bulk weight of 20-60 kg / m.

The heat treatment regimes are selected depending on the type of mineral used in the binder. The sound-absorbing material based on gypsum in the binder is dried, on the basis of cements it is steamed at a temperature of 80-100 ° C, on the basis of clay it is dried and then roasted.

For any materials, the process of treating is reduced by shortening the setting and drying time.

The compositions and results of testing samples made by the proposed method are presented in the table.

Compressive strength, Sha

Flexural strength, MPa

Sound absorption coefficient. in the frequency range of 500-1000 Hz. The obtained samples of heat and sound insulating material have a strength of 55 at compression of 0.2 - 0.91 MPa, at a bend of 0.18 - 0.8 MPa, a coefficient. sound absorption center at frequencies

0.2

0.65

0.9

0.18

0.6

0.8

0.91

0.85

0.81 500-1000 Hz f, 0.81 - 0.91 with a bulk density of 150-300 kg / m. As can be seen from the data table, the use of the proposed method

5 1178742IT

allows a 40-50% increase in durability to remove the excess solution of the cohesive material while retaining the binder.

bulk weight. In addition, moisture the proposed method of obtaining

molding material is reduced by 5 heat-insulating materials

14-50%, at the same time, the operation is excluded - it gives the opportunity to give the product

qi vacuuming, any relief pattern is needed.

Claims (1)

METHOD FOR PRODUCING HEAT AND SOUND INSULATION PRODUCTS from a mixture of mineral fiber, filler and binder, including the preparation of foam, mixing it with mineral fiber and filler, molding and heat treatment, characterized in that, in order to reduce molding moisture, increase the strength and heat and sound insulation properties of products, first, foam is prepared with a multiplicity of 4-8 by mixing water with a blowing agent and a stabilizer, and then the foam is successively mixed with mineral fiber, a binder and fill Lemma, which is used as steklopor with a particle size of 0.5-2 mm. SU „„ 1178742