DE1287240B - Method for gluing parts made of polybutene- (1) - Google Patents

Description

It is the subject of patent application 34293 IVc C / 22i (German Auslegeschrift 1,258,530) to treat parts of 'polybutene (I) with optionally substituted hydrocarbons and assemble ⁰ C under pressure and at temperatures of 50 to IOO. Of the hydrocarbons, the higher-boiling ones in particular lead to a very strong bond. However, these have the property that they evaporate more poorly and thus cause the adhesive point to swell, albeit slightly.

It has now been developed in a further development of the method for gluing parts made of polybutene (I), according to patent application C 34293 IVc / 22i, by treating the parts with an optionally dissolved polybutene (I) containing liquid, optionally substituted hydrocarbon and joining at temperatures of to IOO found 50 ⁰ C under pressure that one can prevent these drawbacks and in addition even a harder adhesive point when a polymerizable liquid such hydrocarbon used as the hydrocarbon.

Suitable liquid polymerizable hydrocarbons are, for. B. styrene or α-methylstyrene. These substances cause in addition to the bonding in most advantageously as a permanent connection through self polymerization.

In order to achieve faster polymerization, one can use the polymerizable hydrocarbon Add 0.001 to 1%, preferably 0.01 to 0.2%, of a radical-forming compound, e.g. B. peroxides, such as benzoyl peroxide, lauroyl peroxide, caprylic peroxide, isopropyl percarbonate, p-menthane hydroperoxide or Azo compounds such as azodiisobutyric acid dinitrile, azodivaleric acid dinitrile.

To lower the treatment temperature, it is advisable to use the radical-forming compounds optionally sensitizers, such as sulfites, thiosulfates, hydrazine, mercaptan, methanol, oxalic acid, polyvalent Add alcohols or ferrous sulfate. These sensitizers are used in amounts from 0.1 to 1000%, preferably 0.5 to 250%, based on the radical-forming compound, is used.

The bonding by means of the polymerizable hydrocarbons can be achieved by painting the parts or dipping and joining under pressure in the cold; particularly permanent bonds however, they are achieved when working in the warmth.

The ratio of the absolute tensile strength of the bonded to the non-bonded polybutene (I) molded part lies between 0.6 and 1.0. The adhesion tests given in the examples are on press plates from 1 mm thick. The strengths of the press plates and the adhesive points are each after 10 days Aging measured at room temperature, thus comparable values of the stable modification I des Polybutene- (I) are present.

Example up to 3

Two press plates made of polybutene (I) with an absolute tensile strength of 26.3 kg / 1.5 cm of sample width and a thickness of 1 mm are coated with styrene of 90 ⁰ C, overlaps Icm and then given 10 minutes at the in the table Pressed temperatures and pressures. The adhesive bond obtained is not swollen and is therefore dimensionally stable.

at
game pressure
(at) Tem
pera
door
( ⁰ C) absolute
Tear
strength
(kg / 1.5 cm
Sample width)
the
Glue point Absolute tear resistance
the glue point
Absolute tear resistance
the press plate 1 10 90 20.1 0.76 2 10 100 23.9 0.91 3 20th 100 25.3 0.96

Examples 4 to 6

Two press plates made of Pofybutene- (I) with an absolute tensile strength of 26.3 kg / 1.5 cm sample width and a thickness of 1 mm are coated with styrene and the activators specified in the table, 1 cm overlap and then pressed together for 10 minutes at lOatü and 90 ° C. You get Parts with a hard glue joint and exact dimensional accuracy.

example Activator Absolute tear resistance
(kg / 1.5 cm sample width)
the glue point Absolute tear resistance
the glue point
Absolute tear resistance
the press plate 4th 24.5 0.93 5 24.2 0.92 6th 0.1% lauroyl peroxide and 0.2% methanol ... 25.0 0.95

Example 7

Two press plates made of polybutene- (I) with an absolute tensile strength of 26.3 kg / 1.5 cm sample width and a thickness of 1 mm are coated with α-methylstyrene containing 0.1% caprylic peroxide, overlapped by 1 cm and then Compressed for 10 minutes at 10 atm and 90 ^° C. The absolute tear strength of the adhesive point is 23.7 kg / 1.5 cm sample width. The ratio of the absolute tear strength of the adhesive point to the absolute tear strength of the press plate is 0.90.

Claims (2)

Patent claims: 1. Method for joining parts made of polybutene- (I), according to patent application C 34293 lVc / 22i (German Auslegeschrift 1258 530), by treating the parts with an if necessary Polybutene (I) containing liquid, optionally substituted hydrocarbon and joining at temperatures of 50 to 100 ° C under pressure, characterized in that the liquid hydrocarbon is a polymerizable liquid hydrocarbon used. 2. The method according to claim 1, characterized in that there is a polymerizable liquid Hydrocarbons with an activator content in amounts of 0.001 to 1 percent by weight used.