SU1476087A2 - Method of heat-insulatiing and sealing of joints with moulded foamed plastic - Google Patents

Abstract

The invention relates to the construction, can be used for insulating and sealing vertical butt joints of constant cross section in the construction of buildings. It allows to provide airtightness of the joint and increase the reliability of the design. A thin layer of the foamable polymer composition is applied on the inside of the joint surrounding the outer surface of the heat pack, from the inside of the joint, for example, on the basis of sprayed polyurethane foam or phenolic resole foam. The foamed thickness after foaming was from 3 to 8% of the width of the joint. Then install a package of insulation with a tight clamp until the foamable polymer composition hardens. The method allows to provide resistance to heat transfer interface 1,73-1,93 (m ² h ° C) / kcal and breathability 14,3-15,0 N [(m ^rm:. Mm of water) / ^kg. h]. 1 tab.

Description

The invention relates to the construction and can be used for the thermal insulation and sealing of vertical butt joints of constant cross section in the construction of buildings.

The purpose of the invention is to ensure the airtightness of the joint and increase the reliability of the design.

The method of insulating and sealing the joints with the molding foam is carried out as follows.

A thin layer of up to 1.5 cm is applied from the inside of the joint, framing the outer surface of the heat pack, from an expanded polymeric composition with an induction period of at least 30 s, for example, on the basis of sprayed polyurethane foam or phenolic resin foam. the amount of foamed foam was somewhat excessive (by 10-20%), which is required by calculation to fill the intermediate volume between the sealing package and the edges of the joint, and the foam thickness after foaming was from 3 to 8% of the width Inna of the joint, with subsequent installation and clamping of a non-foam and non-hardened composition of an elastic insulation package, made, for example, of mineral wool with a mass of at least 100 kg / m

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or polystyrene foam with a bulk weight of more AO kg / me.

The foaming foam composition used should be distinguished by a slower induction foaming period (not less than 30 s), so that after applying the foaming compaction, it is possible to ensure that the insulation package can be installed and pressed in a predetermined position.

This is achieved for the foam-polyurethane composition by eliminating or reducing the amount of the catalyst injected, and for the composition of the phenolic resole foam - by a lesser degree of heating of the phenolic resin as compared with the conventional (about 40 ° C). These techniques for providing an increased foaming period and a foam foam pressing operation provide greater density and increase the water and air tightness of the foam to be foamed.

Applying a layer of expandable polymer compositions onto the edges of the layer ensures reliable sealing of the air cavity in the joint without an air-protective tape device and sticking a package of insulation in the desired position.

Example 1. Thermal insulation of the junction of three-layer wall panels of the house P44 / 17 with a joint cavity of 0.18 0.16 m and a length of 2.85 m is carried out. Ripor 6TND polyurethane foam is used as foamed foam, which has a good adhesion to all materials, with which it comes into contact in the joint cavity: concrete, hernite, roofing material. To ensure a delayed induction period of the foam, Ripor 6 TND is made without a catalyst-tritylamine (TEAL). A 6TND ripor (without TEA) using a Foam 12M type installation was sprayed onto the mouth of a butt with a thickness of 1.5 cm, gripping and adjacent inner edges of the butt. Immediately after spraying, a package of elastic PSB with a bulk volume of 40 kg / m3 in an insulated shell (roofing material), which is compressed by pressure, is tightly pressed to the applied layer.

1.3 kg / cm1 of foaming mass and gives elastic compressive deformation up to 6% by volume. After eatverdes vania, the shrinkage of foamed foam is 1-2%, compensated by expansion of the previously compressed PSB package by the same amount.

Example 2. A foam made from a FRB-1A phenolic resole resin and a VAG-3 catalyst is used as a foamed polymer composition. The components are heated to a temperature of about 30 ° C (less than the standard used by 10 ° C) and mixed in a 4: 1 ratio. After that, the composition is applied to the mouth of the joint (to the hernite) and nearby junction areas, then a package of PSB-C foam is pressed onto the applied layer.

with a bulk weight of 50 kg / m3 in an insulated shell.

When foaming develops a pressure of 0.7 kgf / cm, giving elastic compression of the PSB package by 4.5%. After hardening and shrinkage of the foam, the package gives an elastic consequence of 1% (i.e., a compression of 3.5% remains), which completely compensates for the shrinkage of the foam of the formation, equal to 1-1.5%, guaranteeing

solidity and crack resistance of the joint.

The table shows the main indicators of the joint, made by. ,, - examples 1 and 2.

Claims (1)

Invention Formula Heat insulation and sealing method Days of joints with casting foam on auth. St. No. 1106881, characterized in that, in order to ensure the airtightness of the joint and increase the reliability of the design, the installation of insulated packages is applied to the sections of the exterior wall panels at the place of their contact with the insulation package and at the mouth of the joint from the inside the composition is after foaming thickness of 3-8% of the width of the joint, and the insulation package is installed with a tight pressure before the foamable polymer composition hardens. 50