SU1025705A1 - Method for producing acoustical and heat insulating materials - Google Patents

Abstract

METHOD OF OBTAINING ACOUSTIC JIX AND HEAT-INSULATED MATERIALS, including the preparation of hydromassage from mineral wool granules and chromos: mineral binder, laying the resulting hydromass in a metal pan-form and subsequent shaping and drying, I t ai and ti, ti, ti, ti, ti, ti, ti, ti, ti, ti, ti, ti, ti, t, t, t, t, t, y, t, t, t, y, t, t, t, y, t, t, t, y, t, t, y, t, t, y, t, t, y, t, t, y, t, t, y, t, t, y, t, t, y, t, t, y, t, t, y, t, t, y, t, t, y, t, t. , in order to increase bending strength and reduce deformation during drying, before laying the glue on the metal pan, a modifying oil product with a viscosity of 3.5-15.1 and an aromatic hydrocarbon content of 6-23 wt.% in the amount of ETS 0.05-0.5 wt.%.

Description

The invention relates to methods for producing acoustic and heat insulating materials based on mineral inorganic fibers and can be used in enterprises producing building materials. A semi-dry method of producing acoustic and heat insulating plates is known, according to which lightly rounded mineral wool granules are mixed with a binder having the form of a paste, while the moisture content of the mass after mixing is 300-350% 1. The closest to the invention in its technical essence and the achieved result is a semi-dry method for producing acoustic and heat-insulating plates with a rigid skeleton of mineral fibers based on starch binder, including mixing mineral fiber granules with starch binder (with an excess of the latter) to obtain homogeneous hydruumace, having a humidity of about 350%, is molded into slabs on a molding machine, while the hydromass is placed in a form that is pre-lined with packing paper with to reduce sticking, and drying at 140-1 ° C, after which the blanks are removed from the molds and machined and painted. The starch binder is prepared separately in the form of a paste containing i) -10% starch a la 2. The disadvantage of this method is the high brittleness (low bending strength) of the resulting plates, which leads to destruction and large

Components

Content, May.%, In the composition of the loss of products during demoulding after drying, during transportation and machining. KpONK also requires the use of paper to coat the forms, causes wasteful paper consumption, eliminates the involvement of defective plates in rotary processing, due to the difficulty of separating the burnt paper from the plates during drying, and causes deformation of the plates. The purpose of the invention is to increase the bending strength and reduce the deformation of products during drying. The goal is achieved in that according to the method of obtaining acoustic and thermal insulation materials, including the preparation of hydromass from mineral wool granules and starch binder, laying the resulting hydromass in a metal pan-form and subsequent molding and drying, before placing the hydromass on a metal pan-form sediment t modifying oil product with a viscosity at SO-3 with 3.5-15.1 mmus and aromatic content of hydrocarbons 6-23 wt.% in the amount of 0.05-0.5 wt.%. In the process of drying at elevated temperatures, the oil product is adsorbed by the plate material, modifying its physical and mechanical properties. This increases the flexural strength, reduces the adhesion of the plate material to the mold material. The composition of the modifying oil product used for the proposed method is given in Table 1. 1Tabel 1.

Aromatic hydrocarbons with 1I9

Parafinonaphthenic hydrocarbons with P 1.49

Resins

Example 1. Heat and sound insulating plates are prepared from a homogeneous hydromass obtained by displacing mineral wool granules with a starch binder in an industrial drum mixer. After mixing, the hydromass 60 has a moisture content of 350%. The starch content in the binder is 5% by weight, the consumption of starch binder is 10% by weight per 100% by weight of mineral wool.

6.0-23.0

74-93.9 0.1-3.0

The molding is carried out in metal pallets. The modifying oil product used as an additive is n-agglomerated to 70 ° C and is applied in an even layer to the surfaces of the formulas using a pneumatic sprayer or a brush. When the mold is filled, the plate surface is covered with a uniform layer of the modifying additive. Modifying additive having a viscosity at

3.5 mm / s and the content of aromatic hydrocarbons 6%, Lanos t in the amount of 0.05% of the formable mass.

Drying of the plates is carried out in a tonic saucer at 140-160 ° C, by the end of drying the temperature is uniformly removed to 70-80 ° C.

Example 2. According to the technology described in example 1, plates are formed from homogeneous hydromass. When forming, a modifying additive, having a viscosity at 100 C 6.5 MMVC and an aromatic hydrocarbon content, is applied to the metal pallet form.

15%, in the amount of 0.25% of the moldable mass.

Example 3. The molding was carried out according to the technology described in Example 1. Before laying the molding sand, a modifying additive was applied on the surface of the mold with a uniform layer, having a viscosity of 15.1 MMVC and an aromatic hydrocarbon content of 23%, in an amount of 0.5% of formable mass.

Physico-mechanical and technological properties of the plates obtained by the proposed and known methods are given in table 2.

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When using a modifying oil product with a viscosity below 3.5 and with a content of aromatic hydrocarbons below 6%, the deformability of the plates during drying increases. With an increase in the viscosity of the additive above 15.1 and its content of aromatic hydrocarbons above 23%, there is a danger of the plate sticking to the form. In addition, both in the case of a decrease in the viscosity of the additive, and in the case of its increase in comparison with the specified limits, the processability of the application of the modifying oil product to the surface of the forms deteriorates.

The plates obtained by the method of the invention using a modifying oil product have a higher bending strength (i.e., less brittle), do not adhere to the form, and are significantly less deformed during drying. As a result, the quantity of scrap is reduced, while the destroyed plates are completely returned for recycling, since they are not covered with paper, preventing the formation of homogeneous hydromass before molding. In addition, paper is saved, is-. the use of which in the process of obtaining plates is completely excluded.

Claims (1)

METHOD FOR ACOUSTIC AND HEAT INSULATING MATERIAL 'comprising preparing a hydro mass of mineral wool pellets and the starch binder, packing the resulting hydro mass in a metal pan-shape and further generates ¹ vanie and drying, ιό t l and h and w u and dc I that, in order to increase bending strength and reduce deformation during drying, before laying> hydromass, a modifying oil product with a viscosity at 100 ° C of 3.5-15.1 mm ² / s and an aromatic hydrocarbon content of 6-23 wt.% is applied to the metal sub-form in quantity TBE 0.05-0.5 wt.%.