NL8105789A - BITUMES CONTAINING INSULATING SHEET. - Google Patents

Description

Ν.0. 30 685 Λ - 1 -

Bitumen-containing insulating sheet.

The invention relates to bitumen-containing insulating sheets.

4

Due to adverse weather conditions, it is necessary to insulate roads, bridges, runway slabs made of cement-5 concrete, as well as other technical constructions and buildings against rainwater. The durability of the insulation largely affects the use and longevity of structures and buildings.

The commonly used bitumen-like insulations are, however, insufficient to suitably fill the cracks formed in bridges and runway panels due to dilatation movements and vibrations, allowing rainwater to easily penetrate these cracks into the surface, resulting in soaking and surface corrosion [h.E. Stoach: "faults in road construction applying bitumen", biz. 133 (Cologne, 1973)] Similar damages occur when other structures and structures are insulated with bitumen.

The most widely used insulation material that is used in practice is still bitumen paper. The paper sheets are embedded in hot bitumen. However, paper-based bitumen-like sheets 20 are very easily damaged and begin to rot as a result of these damages. After the first signs of damage, the insulation is abruptly destroyed. These damages appear primarily at joints, runway panel joints and places exposed to movement, so that their repair is difficult and very expensive [Y. Blaha: "Life-span of cemented bituminous roof slabs and coatings", Pozemni Stavly J., (1976) 170-173] ·

In addition to paper sheet insulators, thick bituminous sheets and insulating cardboard with aluminum inserts are also used in practice. A serious drawback of these cardboard products is rapid aging and their weight, which limits the use of such cardboard products in some places, for example as vertical insulations [z. Reiter: "Position of heat and water insulations", Pozemni Stavly 25 (l), (1977) 31-35); C. Quwet: "Damaging 35 of roof insulation", Cahiers Technique du Moniteur, Paris, 14, (1977) 94-95] 8105789 - 2 - * '

With the expansion of plastic production, the use of various plastic sheets, such as PTC and polyethylene sheets, has been increasingly widespread.

Two types of sheet insulation are known in practice: insulation 5 with self-adhesive materials and insulation using separate gummed labels. In most cases, self-adhesive insulating materials are used. However, the materials are difficult to manufacture, although contemporary insulation techniques require them in increasing amounts [c. Hildebrand: "Plastics 10 in building industry", Müszaki Kënuvkiadó, Budapest (1977)] · PTC films are increasingly used for insulating against water and vapors. These films have been made suitable for insulating purposes because of their elasticity, depending on their soaking water contents , relatively high strength, low surface water absorption capacity and their high resistance to chemicals. It is a further advantage that these films can be welded with hot air. The disadvantageous properties of PTC films are related to their plasticizer content. the plasticizer decreases the elasticity of films, with a simultaneous increase in surface-water absorption capacity. Torch, the structure of the plasticizer determines the bitumen tolerance of PTC films, more particularly their ability to combine with bitumen Combination of PTC sheets with bitumen is increasingly widespread, as a result of the migration of the plasticizer decreases the elasticity of the films and therefore they are unsuitable to provide reliable insulation when exposed to dilatation effects due to temperature changes.

The well-known plastic-based insulating materials enable bi-directional movement, i.e. in length and width, while they cannot damp perpendicular effects and vibrations. Therefore, separate vibration dampening materials often need to be incorporated into their structures.

The invention is directed to the elaboration of insulating materials, which are capable of damping perpendicular effects, collisions, pressures and lifts to a certain extent and are able to eliminate the premature breakdown of bridges, runway panels, structures and other structures or at least slow down.

These objects are achieved according to the invention by the development of new, bituminous PTC insulation sheets.

8105789 - 3 -

The bituminous PYC insulation sheets according to the invention are composed of a) a bitumen-containing PYC base layer.

b) Be a closed cell foam layer, 5 c) a self-adhesive or assembly layer, and d) a separating layer.

When constructions, primarily bridges and runway panels, are insulated, the surface of the PYC insulation foil is covered with an asphalt layer. The film and the asphalt-10 layer can only be assembled if the applied PYC film also contains bitumen. The manufacture of such bitumen-containing PYC films is described in Hungarian patent 153 * 355. According to this patent, bitumen-containing films are manufactured in such a way that dissolved or melted and blown, peptized, gel-structured bitumen with the above-described properties is dissolved in part. of the plasticizer used, while PYC is softened with the remainder of the plasticizer, then the bitumen-containing solution is added thereto. In the manner, however, 20 compact films are obtained which do not dampen the perpendicular effects to the insulated article and do not eliminate or alter the damage caused by collisions and vibrations.

The second layer of the bitumen-containing PYC insulating sheet 25 according to the invention is a closed-cell foam layer laminated on the bituminous compact film, made from a product which is the same in composition as the compact film.

The self-adhesive and assembly layer is applied to this foam layer, while the outer layer of the sheet is a separating layer.

The bitumen-containing PYC insulation sheet according to the invention is composed of the following layers: a) A 0.4-1.2 mm thick compact PYC film, which optionally contains bitumen, b) a 0.4-2 mm thick PYC closed-cell foam layer optionally containing bitumen, c) a 0.1-1 mm thick layer for adhesion and assembly and d) a separating layer which ensures the unwinding of the sheet.

The foam layer may be a per se known plastic foam 40 prepared according to conventional methods, which primarily serves to damp perpendicular effects (collisions, pressures, etc.).

The adhesive and assembly layer, which is applied to the foam layer and which as such has an insulating character, serves to adhere the insulating sheet to the surface to be insulated and to provide perfect blocking and insulation at the joints. Therefore, this layer has an important role in the insulation.

The bonding and assembling layer contains 50-80 wt.% Bitumen, 15-5 wt.% Of an adhesion-improving fabric, 12-2 wt.% Of synthetic rubber, 23-15 wt.% Of a fabric, which is the softening point affects and optionally one or more fillers, the latter being at the expense of the other ingredients.

Bitumen with a softening point of 45-120 ° C and a penetration of 100-20 (0.1 mm at 25 ° C) can be used in this layer.

Bitumina of type B-90, K-30 and 85/25 or mixtures thereof [see: "Handbook of petrol products", Müszaki Könyvkiadó, Budapest (1978)] can be used for this purpose.

As adhesion improvers, for example, rosin (pine resin) or similar natural or synthetic resins, further polybutene or similar polymers having a% molecular weight of 850-1350, a density of 0.85-0.95 and a bromine number of at most 25 are applied. Polybutenes with a molecular weight of 950 + 100, a density of 0.88 and a bromine number of 20 are particularly preferred. Rosin, which is applicable in the layer, has a softening point of 60-100 ° C and an acid number of 100-200 mg E0H / g.

As synthetic rubbers, which increase the elasticity and improve the insulating properties (eg resistance to salts and water) of the bonding layer, polymers which do not separate from bitumen can be used and which form a homogeneous system with bitumen. It is preferable to use butadiene-styrene copolymers with a butadiene content of 80-75% by weight. The density of the copolymer is 0.9-1> 0, its tensile strength is 1800-2600 F / cm and its elongation to break is 500-1000%. Atactic polypropenes with a melting temperature of 130-175 ° C, a density of 0.8-0.9 and a penetration of 15-30 can also be used for the same purpose.

The softening point of the adhesive layer is controlled with plasticizers, which are also used in the plastics industry.

Dioctyl phthalate is a preferred plasticizer, however 8105789-5 - substances of vegetable or petroleum origin with a viscosity of 5-50 centistokes at 20 ° C, a freezing point below 0 ° C and a flash point above 150 ° C are also applicable.

Some preferred adhesive and assembly layer compositions are given below: 1. Bitumen 70% by weight 85/25

Dioctyl phthalate 7 wt%

Pine resin 5% melt temperature

65-75 ° C

10 Talk 6% by weight density: 2.2-2.3

Butadiene-styrene 4 wt. 9f> butadiene content copolymer 60% by weight

Atactic poly-3% by melt temperature:

propene 140-150 ° C

Polybutene 5% by weight molecular weight: 950 + 100, density; 0.88 2. Bitumen B-90 50 wt. 96

Bitumen K-3 13% by weight

Dioctyl phthalate 9 wt.% With properties 20 Pine resin 12 wt.% As under point

Atactic poly-8 wt% 1 defined propene

Chalk sludge 8 wt. 96. density: 0.8-1.8 3. Bitumen B-90 63 wt% 25 Dioctyl phthalate 6 wt% with properties

Pine resin 10% by weight as under point

Butadiene-styrene 8% by weight 1 defined copolymer

Polybutene 5% by weight 30 Talc 8% by weight

The bitumen-containing PTC insulation sheet is preferably manufactured as follows:

The closed-cell PTC foam film with a bitumen-containing compact cover layer is made of plastisol in a single operating step by applying plastisol with a rubber roller from two spreader devices to an endless stable belt serving as an intermediate production support.

Plastis isoles of the following composition are used (the numbers represent parts by weight): 8105789 * -6-.

Component Foam layer Compact top coat K 67 emulsion PYC - 100 K 60 emulsion PYC 100 25

Bitumen / plasticizer mixture 80 80 5 Ptalate plasticizer - 5

Stabilizer 2 2

Exoxidized soybean oil. 1 2

Azodicarbonamide foam resin 5 10 filler 5

Preferably, the ingredients are homogenized on a 1-cylinder rubbing roller equipped with a planetary stirrer and the mixture is then processed while maintaining the following operating parameters.

15 Machine speed 9 m / min.

temperature of the gelation tunnel

- when applying the compact top coat 200-250 ° C

- when applying the foam layer 260-280 ° C

spreading width: 1480 mm 2

20 weight of the compact coating 95 µm

thickness of the compact coating 0.9 + 0.1 mm, weight of the foam layer 450 g / m, total thickness: 2.3 + 0.1 mm

The adhesive layer is then formed as follows: 25 Bitumen is melted and heated to 150-170 ° C and the other constituents of the layer are added to the molten bitumen under constant stirring such that the softening point affecting substance is added first, then the other ingredients are added and at the end of the addition the mixture is stirred for another 3-4 hours.

This mass is applied to the closed cell foam layer as follows: The temperature of the mass is adjusted to 90-110, the film is placed under a spreader with an adjustable slit width and the mass is constantly applied to the foam layer 35 before the spreader. The laminated structure is coiled, along with a release layer, preferably polysilorane-treated paper, at a distance from the spreading site.

The mass can also be applied to the foam layer in such a way that the mass is first applied to the polysilouran 40 treated paper, which is used as a separating layer, and the foil with the foam layer side is placed on the foam layer side. hot rolled.

In both methods of application, the thickness of the adhesive and assembly layer can be adjusted by appropriate adjustment of the spreader blade.

The properties of a conventional bitumen-containing PYC sheet according to the invention are as follows: color black weight 1700-1900 g / m2 10 thickness: - total 2.4 + 0.1 mm - compact coating 0.9 + 0.1 mm - foam layer 1.3 mm - self-adhesive layer 0.3 mm 15 width: 900 + 3 mm 500 + 3 mm tensile load 80 U / cm elongation at break 25Qf / at tensile strength: 10 N / mm

20 resistance to cold -20 ° C

water adsorption 0.396 «

The insulating capacity of the bitumen-containing PYC sheet according to the invention was examined as follows: The sheets were rolled on concrete blocks with the self-adhesive layer facing the blocks and the ends of the sheets overlapped. The concrete blocks were pre-treated with a bitumen solution to remove dust.

The insulating sheet adhered well to the concrete and also formed a waterproof coating in the overlapping areas.

The tensile strength of the insulating layer of the concrete was 10 N / cm at a pull-off angle of 180 ° C, while the shear strength was 200-250 N / 10 cm2.

The data characterizing the adhesive strength of the insulating sheet in the overlapping areas are as follows: Peel strength: 35 6-8 N / cm, shear strength: 100-130 N / 10 cm2.

In a further test, a sample prepared as described above was exposed to 1 m water column pressure with 4 cm overlaps and leakage was examined.

The concrete blocks remained completely dry even after 1.month, 40 proving that there was no leakage even in the overlapping areas.

8105789

Claims (3)

1. Bitumen-containing PVC insulating sheet, characterized by the presence of a) a 0.4-1.2 mm thick compact PTC film, optionally containing bitumen 5, b) a 0.4-2 mm thick closed-cell PVC foam layer optionally containing bitumen, c) a 0.1-1 mm thick adhesive and assembling layer and d) a separating layer, which ensures the release of the sheet. Insulation sheet according to claim 1, characterized in that the adhesion and assembling layer consists of 50-80% by weight bitumen, 15-5% by weight of an adhesion improving material, 12-2% by weight synthetic rubber, 23-12% of a substance which affects the softening point and optionally also one or more fillers, the latter being at the expense of the other ingredients. Insulation sheet according to claim 1 or 2, characterized in that a silicone-treated paper is present as a separating layer. 8105789