WO2023096529A1

WO2023096529A1 - Inlay for a heat insulating building cavity

Info

Publication number: WO2023096529A1
Application number: PCT/RU2022/000348
Authority: WO
Inventors: Олег Андреевич ФРИДМАН; Георгий Юрьевич СОЛДАТОВ
Original assignee: Олег Андреевич ФРИДМАН; Георгий Юрьевич СОЛДАТОВ
Priority date: 2021-11-26
Filing date: 2022-11-25
Publication date: 2023-06-01

Abstract

An inlay for a heat insulating building cavity is made of a foam-forming material that includes, in wt%, low-density polyethylene - 100.0; azodicarbonamide - 8.0-12.0; dicumyl peroxide - 0.3-0.8; ethylene propylene rubber - 1.0-10.0; butyl rubber – 2.5-7.5; zinc stearate – 1.5-2.5; zinc oxide – 0.4-0.8. Also claimed is a method of producing said inlay by pre-heating the ingredients to a temperature of 115-130°С and feeding the resulting melt into a rotary mixer in the form of tangentially directed flows to form a foam-forming compound from which, at a temperature of 100-130°С, a target product in the form of a long strip is formed. A method of creating a heat insulating building cavity includes laying the claimed inlay in a building cavity so that the ratio of the cross-sectional area of the inlay to the cross-sectional area of the building cavity is 1:15-20, and subsequently heat treating the inlay at a temperature of 175-185°C to achieve foam formation and the desired heat insulation of the building cavity.

Description

INSERT FOR HEAT-INSULATING CAVITY OF BUILDING STRUCTURE

The claimed invention relates to building structures, and more specifically to building structures containing heat-insulating cavities, even more specifically, the invention relates to an insert for a heat-insulating cavity of a building structure, a method for producing it and a method for obtaining a heat-insulating cavity of a building structure.

The invention will find application, for example, in the production of window, door profiles, other building structures used, including in cars, aircraft for heat and sound insulation.

In building structures containing heat-insulating cavities, the most critical, in terms of heat loss, is the junction of their outer and inner elements. In order to reduce heat losses along the connection line of their outer and inner elements, a hollow heat-insulating chamber is provided, which, in a number of well-known technical solutions, is additionally filled with a heater - foamed material, polyurethane foam having low thermal conductivity (RU, 2472910; DE 202013103716).

The main problem of these solutions is the difficulty of installing the insulation in a heat-insulating cavity, as well as in the mode of its curing - in the central part of the cavity, the insulation hardens for a long time, which complicates and lengthens the technological process for the production of such building structures.

In particular, in the publication DE 202013103716, a combined construction profile for doors, windows, frames or facade structures is described, in which the insulation is an insert made of a mixture of biobased polyamides, a compatibility regulator - block copolymers or ternary polymers of polyamides, silanes, processing aids and/or lubricants in the form of calcium stearate and fiberglass. The liner is prefabricated and placed in a heat-insulating cavity during the assembly of the combined profile. In the manufacture of liners, the initial mixture is poured into auxiliary molds or mandrels specially designed for this purpose, made taking into account ensuring that the dimensions of the liners correspond to the dimensions of the heat-insulating cavity of the corresponding combined profile. The use of such a heater requires the involvement of additional rather complex equipment for its production, which increases the cost of profiles and complicates their manufacture. Also, due to the fact that in such an assembled profile between the heater and the walls of the heat-insulating cavity there are inevitably technological gaps, the combined profile with such a heater is characterized by significant convection heat losses.

The technical solution described in the patent RU, A, 2472910 eliminates the need to manufacture liners, the configuration and dimensions of which must exactly match the dimensions of the thermally insulating cavity, as well as the subsequent installation of the liners into the chamber of the thermally insulating cavity and its seal. According to the patent RU, A, 2472910, in the combined profile, its outer and inner elements are connected by means of a thermal insert in the form of a hollow chamber, in the longitudinal walls of which there are holes provided with snap-on covers. The hollow chamber filler made of polyurethane foam having a lower coefficient of thermal conductivity than the material used to make the profile elements is poured in liquid form through the specified holes and the structure is kept until the filler hardens, after which the covers are snapped into place. In this case, despite some simplification of the technology for the production of the structure and its assembly, the uneven hardening of the filler leads to an increase in the time of the technological process of assembling the profile, and the complexity of the shape of the thermal insert leads to an increase in its cost.

These shortcomings can be eliminated using the technical solution described in the application for European patent 3 293 337, publ. 03/14/2018, which we use as a prototype.

According to the materials of the said application for European patent 3 293 337, a preformed liner of arbitrary configuration is placed in the heat-insulating cavity of the assembled building structure, including the window/door profile, the volume of which is much less than the internal volume of the heat-insulating cavity. According to the materials of this application, in the process of heat treatment of the assembled building structure at a temperature of 190 ° C for 20 minutes, at the final stage of the production of the profile - its coloring, foaming of the material from which the liner is made takes place, and its expansion ensures that the volume of the cavity is actually completely filled with the formed solid foam . This technical solution provides more easy placement of the liner in a heat-insulating cavity eliminates the formation of technological gaps and significant convection heat losses when using a building structure. In accordance with the description of the said application for European patent 3 293 337, the liner consists of a material that is a multi-component composition used to form the liner, and a chemical product applied to the already formed liner. When forming the liner, a multicomponent composition based on: ethylene vinyl acetate with a vinyl acetate content of 19% to 21%, having a melt flow index of 17-23; physical blowing agent, for example, isopentanes, CO2, hydrofluorocarbons, made in the form of microspheres with a diameter of 20 microns to 40 microns, in the amount of 1 - 40 wt. %; a chemical blowing agent, for example, tetrazoles, sulfohydrazides, azodicarbonamides, bicarbonates, taken in an amount of 1 to 20 wt.% relative to the mass of microspheres with a physical blowing agent; cross-linking agent - peroxide; nanofillers in the form of montmorillonites. As stated above, the liner material further comprises a chemical adhesive polymeric material such as hot melt adhesive. That is, an adhesive control layer with a thickness of 0.2-0.6 mm is applied to the outer surface of the semi-finished product of the liner, made of an adhesive polymeric material, for example, hot-melt adhesive, which ensures adhesion of the thermal liner to the inner surfaces of the heat-insulating chamber.

In accordance with the description of the said application for European patent 3 293 337, these ingredients used in the formation of the liner are mixed together, then the resulting mixture is granulated and the liner is formed from the obtained granules in molds, for example, in the form of an elongated element with a virtually straight axis, and at the final stage of obtaining the liner, an additional ingredient of the material - an adhesive polymeric material in the form of a layer is applied to the surface of the formed liner.

Despite these advantages of the technical solution described in the application for European patent 3 293 337, reliable and stable thermal insulation is not provided due to the low adhesion of the foam insert material to the internal surfaces of the heat-insulating cavity and due to the formation of corresponding voids; the production technology of liners is complicated by additional stages, in addition, the use of a material based on an ethylene-vinyl acetate copolymer in the formation of the liner has led to a reduced insufficient rigidity of the liner, which negatively affects the possibility of uniform placement of the liner in the volume /filling with the liner/ of the heat-insulating cavity, leading, when foaming the liner material, to partial filling of the cavity with the formation of voids in it and, therefore, to heat losses when using the building structure. In this case, in general, the technical solution described in the application for European patent 3 293 337 has a complicated technology for creating a building structure of this type.

The claimed invention is based on the task of developing an insert for a heat-insulating cavity of a building structure based on such ingredients taken in such a ratio, such a method that realizes its production based on such more technological methods and modes of execution, as well as such a method for obtaining a heat-insulating cavity of a building structure that are more in a simple and convenient technological way, they made it possible to fill the heat-insulating cavity with a foamed insert, which in turn ensures the targeted efficiency of the heat-insulating cavity.

The technical result that can be achieved by using the proposed insert for a heat-insulating cavity, its implementing method and the method for obtaining an appropriate heat-insulating cavity of a building structure is the ability to provide full-volume filling of the named cavity, to exclude the formation of voids in it, which determines the high heat and sound insulation of the building structure. both due to the ratio of the selected ingredients of the liner, and due to the technological methods used to obtain the liner and the heat-insulating cavity, which comprehensively ensure the exclusion of heat losses when using the building structure.

The problem was solved by creating an insert for a heat-insulating cavity of a building structure, made of a foaming material, including polyolefin, azodicarbonamide, dicumyl peroxide, in which, according to the invention, a foaming compound is used as a foaming material, containing low-density polyethylene as a polyolefin, and also containing additionally ethylene-propylene rubber, butyl rubber, zinc stearate and zinc oxide, while the mentioned ingredients are contained in the following ratio, mass part:

Low density polyethylene -100.0; Azodicarbonamide - 8.0-12.0;

Dicumyl peroxide - 0.3-0.8;

Ethylene-propylene rubber - 1.0 -10.0;

Butyl rubber - 2.5-7.5;

Zinc stearate - 1.5-2.5;

Zinc oxide - 0.4-0.8, which ensured reliable adhesion of the material of the foamed insert to the inner surfaces of the heat-insulating cavity, increased rigidity of the insert with comparable foaming and expansion of the insert material.

In accordance with the claimed invention, it is useful that ethylene-propylene diene rubber containing ethylene units in the amount of 50-70 wt. %, which ensures the simultaneous flow of processes of crosslinking of the polymer part of the compound and decomposition by azo dicarboxylic acid, thus forming the formation of foam.

This problem is also solved by creating a method for producing an insert for a heat-insulating cavity of a building structure, which, according to the invention, is obtained from the following initial ingredients: low-density polyethylene, azodicarbonamide, dicumyl peroxide, ethylene-propylene rubber, butyl rubber, zinc stearate and zinc oxide, which are preheated to a temperature of 115-130 ° C and is fed into a rotary mixer in the form of tangentially directed flows of the obtained melts in an amount that ensures the formation of a foaming compound in which the named ingredients are in the following ratio, May. part: low density polyethylene -100.0; azodicarbonamide - 8.0-12.0; dicumyl peroxide - 0.3-0.8; ethylene-propylene rubber - 1.0 -10.0; butyl rubber - 2.5-7.5; zinc stearate - 1.5-2.5; zinc oxide - 0.4-0.8, from which, at a temperature of 100-130°C, the target product of a long-length form is formed.

Thanks to the claimed method, it became possible to ensure uniform mixing of the ingredients used and, therefore, a homogeneous structure of the foaming compound throughout the entire volume of the liner, causing its uniform foaming, as well as high adhesion of the foamed liner to the walls of the heat-insulating cavity, which generally excludes the formation of voids in the heat-insulating cavity.

To achieve a more uniform structure of the foaming compound throughout the volume of the insert, according to the invention, it is useful to crush and homogenize the formed compound before forming the target product. This problem is also solved by creating a method for obtaining a heat-insulating cavity of a building structure, including laying a long-shaped insert into the cavity of a building structure, followed by heat treatment to achieve foaming and targeted thermal insulation of the building structure cavity, in which, according to the invention, at least one insert is used when laying, containing, wt.part: low density polyethylene -100.0; azodicarbonamide - 8.0-12.0; dicumyl peroxide - 0.3-0.8; ethylene-propylene rubber - 1.0 -10.0; butyl rubber - 2.5-7.5; zinc stearate - 1.5-2.5; zinc oxide - 0.4-0.8, while ensuring the ratio of its cross-sectional area to the cross-sectional area of the cavity of the building structure, which is 1: 15-20, and the subsequent heat treatment is carried out at 175-185 ° C, while it is mainly sufficient to carry out heat treatment within 20-40 minutes, while it is possible, according to the invention, to use two liners when laying while ensuring the ratio of their total cross-sectional area to the cross-sectional area of the heat-insulating cavity of the building structure, which is 1: 15-20.

Thanks to the claimed method of obtaining a heat-insulating cavity of a building structure, it became possible to provide high heat and sound insulation of the building structure.

Other objectives and advantages of the claimed invention will become clear from the following detailed description of the insert for the heat-insulating cavity of the building structure, the method of obtaining it, as well as the method for obtaining the heat-insulating cavity of the building structure and examples of the insert and the named methods.

The inventive insert for a heat-insulating cavity of a building structure is made of a foaming compound based, according to the invention, on such a polyolefin as low-density polyethylene (density 900-930 kg/m3), which is a thermoplastic polymer with the properties of a light, durable, solid material. Low density polyethylene has low water absorption (about 0.02% per month) and high plasticity; moisture and air impermeability is characteristic of such a polymer. It is known that low-density polyethylene is absolutely safe for the environment, since it does not emit any toxic substances. It should be noted that used in the prototype polymer - ethylene vinyl acetate compared to low-density polyethylene has reduced hardness, reduced barrier properties against gases and water vapor, lower chemical resistance and heat resistance.

The inventive liner for a heat-insulating cavity of a building structure is made of a foaming compound, which also contains azodicarbonamide, which acts as a chemical blowing agent, and dicumyl peroxide, which is a crosslinking agent in this compound. Also, the foaming compound preferably contains a diene rubber such as ethylene propylene rubber, preferably with an ethylene group content of 50 to 70%. When using ethylene-propylene diene rubber with an ethylene content of 50-70%, the crosslinking and foaming rates are matched, due to which the resulting foam completely fills the entire volume of the heat-insulating cavity of the building structure.

Dicumyl peroxide, when interacting with diene rubber, accelerates the process of chemical crosslinking at the foaming stage and ensures foam stability at high temperatures. Ethylene-propylene diene rubber in combination with butyl rubber present in the foaming compound promotes reliable adhesion of the resulting foam to the walls of the heat-insulating cavity. The foaming compound also contains zinc stearate and zinc oxide, which, by lowering the decomposition temperature of azodicarbonamide, are activators of its decomposition.

In accordance with the invention, these ingredients are contained in the following ratio, May. part: low density polyethylene -100.0; azodicarbonamide - 8.0-12.0; dicumyl peroxide - 0.3-0.8; ethylene-propylene rubber - 1.0 -10.0; butyl rubber - 2.5-7.5; zinc stearate - 1.5-2.5; zinc oxide - 0.4-0.8.

As studies have shown, when the content of dicumyl peroxide in the foaming compound is less than 0.3 wt.h. there is a rapid expansion and foaming of the liner made of said foaming compound when heated to the temperature indicated below, but the foam immediately "sits down" and turns into a monolith. When the content in the foaming compound peroxide dicumil more than 0.8 wt.h. on the contrary, there is no expansion and foaming of the liner made of the said foaming compound, because due to the high degree of crosslinking, low density polyethylene loses elasticity and does not expand under the pressure of gases released during the decomposition of azodicarbonamide.

Zinc oxide and zinc stearate activate the decomposition of azodicarbonamide and dicumyl peroxide, for this reason, their content is proportional to the total concentration of azodicarbonamide and dicumyl peroxide.

Ethylene-propylene diene rubber accelerates the cross-linking process and increases the rigidity of the liner made of the above-mentioned foaming compound, therefore, the higher the concentration of diene rubber, the higher the rigidity of the liner - the lower the value of the “sag” indicator. Depending on the technological requirements, when laying the liner into the heat-insulating cavity and the required warm-up time for foaming the foam-forming compound, from 1.0 to 10.0 wt.h. diene rubber. When the content in the diene rubber compound is less than 1.0 wt.h. there is no acceleration of the crosslinking process and after the completion of the decomposition of azodicarbonamide, the foam can "sit down", forming voids in the chamber being filled. When the concentration of diene rubber in the compound is more than 10.0 wt.h. on the contrary, the crosslinking process is ahead of the foaming process and no foam is formed.

The introduction of butyl rubber into the composition of the compound makes it possible to reduce the gas permeability of the foam and increase the adhesive strength of the foam. The introduction of butyl rubber in an amount of more than 7.5 wt.h is not economically and technically feasible. When the content of butyl rubber is less than 2.5 wt.h. the effect of reducing gas permeability is not detected.

In accordance with the claimed invention, an insert for a thermally insulating cavity of a building structure is obtained from the above starting ingredients, namely: low density polyethylene, azodicarbonamide, dicumyl peroxide, ethylene-propylene rubber, butyl rubber, zinc stearate and zinc oxide, which are preheated to a temperature of 115 -130° C until the formation of melts. Melts of said ingredients are fed into the rotary mixer in the form of tangentially directed flows with the achievement of their homogenization in the chamber of the rotary mixer at a temperature of 115-130°C until a homogeneous compound is formed. When heated to temperatures below 115 degrees. With it is impossible to achieve uniform distribution of the ingredients of the compound, and at temperatures above 130 degrees. With the process of polymer crosslinking begins and such a compound will not subsequently foam.

Proposed in accordance with the claimed method, the tangential supply of melts of ingredients into a rotary mixer causes the melts to rotate perpendicular to each other, which ensures the intensification of mass transfer processes, increases the mass transfer coefficient, which as a result contributes to uniform mixing of the ingredients used and, therefore, ensures a uniform structure of the foaming compound , causing further its uniform foaming in the volume of the heat-insulating cavity.

In order to achieve a more uniform structure of the foaming compound throughout the entire volume of the liner, according to the invention, it is useful to grind the formed compound after cooling to a temperature below 50 degrees C to particles preferably less than 8 mm before forming the target product.

From the thus prepared foaming compound, according to the claimed method, at a temperature of 100-130°C using a single-screw extruder, the target product is formed into a long-length shape, for example, in the form of a long-length cord.

Thanks to the claimed method, it became possible to ensure both uniform mixing of the ingredients used and, as a result, a homogeneous structure of the foaming compound throughout the volume of the heat-insulating insert, which causes its uniform foaming, and high adhesion of the foamed insert to the walls of the heat-insulating cavity, which in combination eliminates the formation of voids in the heat-insulating cavities.

In accordance with another object of the claimed invention, obtaining a heat-insulating cavity of a building structure is carried out by uniform laying - uniform distribution of the liner over the volume of the cavity. Achieved due to the use of a more rigid polyethylene instead of an ethylene-vinyl acetate copolymer, the sufficient rigidity of the liner and, as a result, its resistance to bending under its own weight, makes it possible to fill, without the use of special devices, also sections of the cavity remote from the liner insertion point, which contributes to the foaming of the compound full-volume filling of the heat-insulating cavity with foam without the formation of voids in it - in the future, when using the building structure, heat losses are excluded.

At least one, possibly two or more previously described inserts of a long-length shape are laid in the cavity of the building structure, while observing the condition for ensuring the ratio of the cross-sectional area of the insert to the cross-sectional area of the cavity of the building structure, which is 1: 15-20. The subsequent heat treatment of the liner, located in the heat-insulating cavity, is carried out at a temperature of 175-185°C, which makes it possible to ensure the process of uniform foaming of the compound from which the liner is made in the entire volume of the cavity. It is advantageously sufficient to carry out the heat treatment for 20-40 minutes. With a shorter heat treatment time, it is possible to partially preserve voids in the volume of the cavity, since the insert is not completely warmed up and has not foamed in full. With a longer heat treatment time, the resulting foam begins to settle, which also leads to the formation of voids in the heat-insulating cavity and a decrease in the heat and sound insulation qualities of the building structure.

Thanks to the claimed method of obtaining a heat-insulating cavity of a building structure, it became possible to provide high heat and sound insulation characteristics of the building structure.

Thanks to the claimed invention, it is possible to provide increased adhesion of the foaming compound to the walls of the filled cavities and, as a result, the complete absence of moisture condensation on the walls of the filled cavities during the operation of products at variable temperatures; high heat and sound insulation of the building structure can be achieved both due to the ratio of the selected ingredients of the liner, and due to the technological methods used to obtain the liner and its foaming in the heat-insulating cavity. The claimed objects of protection comprehensively provide the possibility of full-volume filling of the heat-insulating cavity with a foamed insert without the formation of voids in it and, accordingly, heat losses when using a building structure.

Example 1

A long liner for a heat-insulating cavity of a building structure is obtained from a foam-forming compound of the following initial ingredients: low density polyethylene, azodicarbonamide, dicumyl peroxide, ethylene propylene rubber, butyl rubber, zinc stearate and zinc oxide. The starting ingredients are preheated to a temperature in the range of approximately 115-130° C. until melts form. The resulting melts are fed into the rotary mixer in the form of tangentially directed flows in an amount that ensures the formation of a foaming compound in which the named ingredients are in the following ratio, May. part: low density polyethylene -100.0; azodicarbonamide - 8.0; dicumyl peroxide - 0.3; ethylene propylene diene rubber with a polyethylene content of 50 wt%. - 2.6; butyl rubber - 5.0; zinc stearate - 1.5; zinc oxide - 0.4. The resulting compound after cooling to a temperature below 50 deg. With crushed to particles mainly less than 8 mm and homogenized. From the prepared foaming compound, at a temperature of 100-130°C, a long liner is formed in the form of a long cord.

The resulting lengthy liner is placed in a heat-insulating cavity of a building structure and distributed evenly throughout the entire volume of the cavity. The condition for ensuring the ratio of the cross-sectional area of the liner to the cross-sectional area of the cavity of the building structure, which is 1: 15-20, is observed. Then heat treatment of the liner located in the thermally insulating cavity is carried out in the process of technologically specified coloring of the building structure at a temperature of 175-185 ° C for 20-40 minutes, uniform foaming of the compound from which the liner is made is achieved throughout the entire volume of the cavity. High thermal and sound insulation of the building structure has been achieved.

The characteristics of the foamed long-length insert located in the heat-insulating cavity are shown in Table 1.

Example 2

Obtaining a long liner for a heat-insulating cavity of a building structure is carried out similarly to that described in example 1, however, in the formed compound, the ingredients are in the following ratio, may. part: low density polyethylene -100.0; azodicarbonamide - 12.0; dicumyl peroxide - 0.8; ethylene propylene diene rubber with a polyethylene content of 60 wt%. - 7.0; butyl rubber - 4.0; zinc stearate - 2.5; zinc oxide - 0.8. Obtaining a heat-insulating cavity of a building structure is carried out similarly to that described in example 1, however, three liners from a foaming compound are introduced into the heat-insulating cavity.

Characteristics of long-length foam inserts located in the heat-insulating cavity are shown in Table 1.

Example 3

Obtaining a long insert for a heat-insulating cavity of a building structure is carried out similarly to that described in example 1, however, in the formed compound, the ingredients are in the following ratio, wt. part: low-density polyethylene -100.0; azodicarbonamide - 10.0; dicumyl peroxide - 0.5; ethylene propylene diene rubber with a polyethylene content of 55% wt. - 7.5; butylkachuk - 4.0; zinc stearate - 2.0; zinc oxide - 0.6.

Obtaining a heat-insulating cavity of a building structure is carried out similarly to that described in example 1.

Example 4

Obtaining a long insert for a heat-insulating cavity of a building structure is carried out similarly to that described in example 1, however, in the formed compound, the ingredients are in the following ratio, wt. part: low-density polyethylene -100.0; azodicarbonamide - 8.0; dicumyl peroxide - 0.35; ethylene propylene diene rubber with a polyethylene content of 55% wt. - 1.0; butylkachuk - 7.5; zinc stearate - 2.0; zinc oxide - 0.6.

Example 5

Obtaining a long liner for a heat-insulating cavity of a building structure is carried out similarly to that described in example 1, however, in the formed compound, the ingredients are in the following ratio, May. part: low density polyethylene -100.0; azodicarbonamide - 12.0; dicumyl peroxide - 0.5; ethylene propylene diene rubber with a polyethylene content of 55% wt. - 10.0; butylkachuk - 2.5; zinc stearate - 2.0; zinc oxide - 0.6.

Example 6

Obtaining a long liner for a heat-insulating cavity of a building structure is carried out similarly to that described in example 1, however, in the formed compound, the ingredients are in the following ratio, may. part: low density polyethylene -100.0; azodicarbonamide - 10.0; dicumyl peroxide - 0.7; ethylene propylene diene rubber with a polyethylene content of 55% wt. - 4.0; butylkachuk - 5.0; zinc stearate - 2.0; zinc oxide - 0.6.

Example 7

Obtaining a long insert for a heat-insulating cavity of a building structure is carried out similarly to that described in example 1, however, in the formed compound, the ingredients are in the following ratio, wt. part: low-density polyethylene -100.0; azodicarbonamide - 10.0; dicumyl peroxide - 0.8; ethylene propylene diene rubber with a polyethylene content of 55% wt. - 5.0; butylkachuk - 4.0; zinc stearate - 2.0; zinc oxide - 0.6.

Example 8 (comparative in accordance with the prototype) Table 1

Claims

Claim

1. An insert for a heat-insulating cavity of a building structure, made of a foaming material, including polyolefin, azodicarbonamide, dicumyl peroxide, distinguished by the fact that a foaming compound containing polyethylene as a polyolefin is used as a foaming material. low density, as well as additionally containing ethylene-propylene rubber, butyl rubber, zinc stearate and zinc oxide, in which the mentioned ingredients are contained in the following ratio, wt. part:

Low density polyethylene -100.0;

Azodicarbonamide - 8.0-12.0;

Dicumyl peroxide - 0.3-0.8;

Ethylene-propylene rubber - 1.0-10.0;

Butyl rubber - 2.5-7.5;

Zinc stearate - 1.5-2.5;

Zinc oxide - 0.4-0.8.

2. An insert for a heat-insulating cavity of a building structure according to claim 1, characterized in that ethylene-propylene diene rubber with a polyethylene content of 50-70% is used as ethylene-propylene rubber.

3. A method for producing an insert for a heat-insulating cavity of a building structure according to claim 1, differing in that it is obtained from the following starting ingredients: low-density polyethylene, azodicarbonamide, dicumyl peroxide, ethylene-propylene rubber , butyl rubber, zinc stearate and zinc oxide, which are preheated to a temperature of 115-130 ° C and fed into a rotary mixer in the form of tangentially directed flows of the resulting melts in an amount that ensures the formation of a foaming compound in which the named ingredients are in the following ratio, wt .part: low density polyethylene -100.0; azodicarbonamide - 8.0-12.0; dicumyl peroxide - 0.3-0.8; ethylene-propylene rubber - 1.0-10.0; butyl rubber - 2.5-7.5; zinc stearate - 1.5-2.5; zinc oxide - 0.4-0.8, from which, at a temperature of 100-130°C, the target product is formed in the form of a long cord.

4. A method for producing an insert for a heat-insulating cavity of a building structure according to claim 3, characterized in that before the formation of the target product, the formed compound is crushed and homogenized.

5. A method for obtaining a heat-insulating cavity of a building structure, including laying an insert in the form of a long cord into the cavity of a building structure and its subsequent heat treatment to achieve foaming and target thermal insulation of the cavity of a building structure, differing from the fact that when at least one liner according to claim 1 is used in the laying, while ensuring the ratio of its cross-sectional area to the cross-sectional area of the cavity of the building structure, which is 1: 15-20, and subsequent heat treatment is carried out at 175-185 ° C.

6. A method for obtaining a heat-insulating cavity of a building structure according to claim 5, characterized in that the heat treatment is carried out for 20-40 minutes.

7. The method according to claim 5, characterized in that two inserts are used when laying, while ensuring the ratio of the total area of their cross section to the cross sectional area of the heat-insulating cavity of the building structure, which is 1: 15-20.