DD295179A5 - ADHESIVE COLD ADHESIVE AT BITUMEN BASIS - Google Patents

Abstract

The invention relates to a adhesive cold adhesive based on bitumen. The aim and object of the invention is to inexpensively produce an adhesive cold glue bitumen-based from easily accessible and available raw materials, preferably in the building protection in the bonding of Daemmdachmaterialien such. B. PS foam with bitumen or bitumenvertraeglichen webs can be used. The adhesive should have good adhesion and strength properties, good storage stability, stability at high temperatures and sufficient flexibility at low temperatures. The adhesive adhesive of the invention comprises a mixture of distillate bitumen, styrene-butadiene-rubber, butadiene-rubber, adhesive resin, cellulose fiber filler and a solvent mixture. Paints and varnishes; Rubber; Bitumen; natural resins; macromolecular compounds}

Description

Field of application of the invention

The invention relates to an adhesive cold adhesive bitumen-based for building protection, in particular for the coverage of insulated roofs for bonding bituminous vapor barrier, vapor pressure and motion compensation tracks or the first roof skin layer and fixing the insulation boards to the ground and with each other.

Characteristic of the known state of the art

The use of self-adhesive adhesives - often referred to in the specialist literature as "pressure-sensitive adhesives" (PSA) - is state-of-the-art in many processing sectors of the economy.

In construction, the bonding of polystyrene, polyurethane or other insulating materials in conjunction with bituminous sealing materials plays an important role.

A known solution for bonding these materials is the use of hot bitumen having a softening point RuK-8O ⁰ C as an adhesive component. However, this process has many disadvantages:

The processing temperature should be at least 16Q ° C. Under site conditions overheating to 18O ⁰ C to 20O ⁰ C are often realized. At these high temperatures occurs a reduction in the insulating effect. The melting and the handling of the molten bitumen represents a constant source of danger from the point of view of occupational safety. In addition, there are losses of production due to the melting process.

Bonding with hot bitumen can only be professionally carried out on dry surfaces and only meets the requirements for adhesive strength and flexibility in the frost-free season.

The in the cold season in the insulating material - especially in foam polystyrene - to be detected key movement and the often higher wind stress often lead after only 1 to 2 years to excessive demand of the material. An improvement in the flexibility at low temperatures is achieved by mixing hot bitumen with 8% to 12% styrene-butadiene rubber, the styrene content being 30%.

The mixing process, however, is very energy consuming, and the processing of these mixed bitumen proves to be extremely complicated. Even at the high processing temperatures of about 200 ⁰ C, the adhesive does not completely lose its cohesive visco-elastic consistency.

An alternative to hot bonding is the adhesive bonding known only in building protection for a few years. The essence of these cold adhesives is that self-adhesive adhesive compositions (PSA) acquire technological processability at room temperature, which enables the adhesive layer to be applied to the construction site , Such self-adhesive compositions contain as essential constituents predominantly mixtures of bitumen and thermoplastic block copolymers, as described in GB-PS 1201135, PS-DE 215 7810 and OS-DE 271 3671. In compounds with volatile solvents, these adhesives have good wetting properties, good tack properties and high adhesive strengths.

The disadvantage, however, that block copolymers can currently only be produced by very expensive technological processes and therefore are very expensive.

DE-OS 234 3972 describes a self-adhesive material based on a mixture of bitumen, mineral oil, a yellow binder, preferably a metal stearate and optionally a filler. The field of application mainly concerns the production of adhesive tapes.

An adhesive composition based on coal tar, sticky resins, nitrite and SB rubber is described in GB-PS 1,422,124.

A Adhäsivkaltklebstoff based chemically readily accessible substances describes the DD-WP 271338. By means of a combination of bitumen with a softening point 8O ⁰ C, a SB rubber with a styrene content of 30 to 65%, an adhesive resin and a solvent mixture achieved great adhesive strength and good tack properties.

A major disadvantage of these adhesives, however, is that good tack properties are achieved only in adhesive resin contents of 10% in the recipe, which at the same time a reduction in the elastic-plastic properties, especially at low temperatures, is connected.

Object of the invention

The aim of the invention is to inexpensively produce an adhesive bitumen-based adhesive from readily available and readily available raw materials, preferably in the building protection in the bonding of insulating roofing materials such. As polystyrene foam with bitumen or bitumenverträglichen webs, can be used. The adhesive cold adhesive should be characterized by good adhesive properties and good processability. The solvent-free adhesive joints should have good heat resistance at high temperatures and sufficient flexibility over non-structural building movements at low temperatures.

Explanation of the essence of the invention

The invention is based on the object by combination of bitumen with styrene-butadiene-hot rubber, butadiene-liquid rubber, adhesive resin, cellulose fiber fillers and solvents to produce an adhesive cold adhesive. According to the invention the object is achieved by a mixture having the following composition:

a) 60 to 80 wt .-% of desalination bitumen having a softening point RuK - 55 ⁰ C.

b) from 0.5 to 5% by weight of styrenebutadiene rubber with a styrene content of between 30% and 65%

c) 7 to 12 wt .-% adhesive resin

d) 4 to 10% by weight cellulose fiber filler

e) 0.1 to 0.5 wt .-% solvent

f) 10 to 22 wt .-% solvent

Adhesive cold adhesive of such composition is a homogeneous composition which can be spatulated at room temperature with good instant adhesion to all bitumen-compatible materials, high final strength, high heat resistance and good low-temperature flexibility.

exemplary

The invention will be explained in more detail with reference to an exemplary embodiment:

67,5kg bitumen with a Erweichungpunkt RuK of 65 ⁰ C are introduced at reflow temperature in a vessel equipped with a double jacket double-Z kneader. After cooling to about 10K above the softening point RuK of the bitumen 4.4 kg C _a aromatics are added and mixed with the bitumen. After further cooling to about 4O ⁰ C, a prefabricated rubber-resin solution consisting of 1.7 kg SB rubber BUNA 112,10,5Kolophonium, 0.2kg butadiene liquid rubber Sconamoll 32 and 10.2 kg of methylene chloride is added. After homogenization, the addition and incorporation of 5.5 kg of cellulose fiber filler takes place. The finished mixture is discharged via a screw conveyor. The following values were determined during the examination of the usage properties:

Softening point RuK ⁰ C 102 ° C

Breaking point according to Fraaß ° C -18 ⁰ C

Tensile strength after 4 hours

in KN / m ² (bituminous membrane / PS foam) 36

Tensile strength after 48 hours

in KN / m ^s (bituminous membrane / PS foam) 110

Processing Viscosity at 20 ° C 360 Pas

Claims (5)

1. Adhesive cold adhesive based on bitumen for building protection, in particular for the coverage of insulated roofs for bonding bituminous vapor barriers, vapor pressure and motion compensation or the first roof skin layer and for fixing the insulation boards to the ground and with each other, characterized in that the mixture of a) 60 to 80 wt .-% distillation bitumen with a softening point RuK 55 ⁰ C b) '0.5 to 5 wt .-% styrene-butadiene rubber with a styrene content between 30% and 65% c) 7 to 12 wt .-% adhesive resin d) 4 to 10 wt .-% cellulose fiber filler e) 0.1 to 0.5 wt .-% liquid rubber f) 10 to 22 wt .-% solvent consists. 2. Adhesive cold glue bitumen-based according to claim 1, characterized in that the styrene-butadiene copolymer has a bound styrene content of about 45%. 3. Adhesive cold adhesive based on bitumen according to claim 1 and 2, characterized in that the adhesive resin is a mixture of resin acids, mainly abietic acid and their isomers. 4. Adhesive cold adhesive based on bitumen according to claim 1 to 3, characterized in that the cellulose fiber filler is a cellulose content of at least 90% and the fiber length in the range of 600 μηι to 1000μηι. 5. Adhesive cold adhesive based on bitumen according to claim 1 to 3, characterized in that the liquid rubber is a polybutadiene having a molecular weight of 2000 to 10,000.