DE1287240C2 - PROCESS FOR GLUING PARTS MADE OF POLYBUTEN- (1) - Google Patents

Description

It is the subject of patent 12 58 530, parts made of polybutene (I) with optionally substituted hydrocarbons to be treated and put together under pressure and at temperatures of 50 to 100 ° C. Of the hydrocarbons, the higher-boiling ones in particular lead to a very strong bond. However, these have the property of evaporating more poorly and so one to cause little swelling of the adhesive.

It has now been developed in a further development of the method for gluing parts made of polybutene (l), according to U.S. Patent 12 58 530, by treating the parts with an optionally containing polybutene (I) in solution liquid, optionally substituted hydrocarbon and joining at temperatures from 50 to 100 ° C under pressure found that you can prevent these disadvantages and in addition even a harder bond is obtained if a polymerizable liquid hydrocarbon is used as the hydrocarbon used.

Suitable liquid polymerizable hydrocarbons are, for. B. styrene or α-methylstyrene. These In addition to gluing, fabrics create a permanent bond in a highly advantageous manner 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 add sensitizers, such as sulfites, thiosulfates, hydrazine, mercaptan, methanol, oxalic acid, polyhydric alcohols or ferrous sulfate, to the radial-forming compounds. These sensitizers are used in amounts of 0.1 to 1000%, preferably 0.5 to 250 °. d, based on the radical-forming compound, is used.
The bonding by means of the polymerizable

ίο Hydrocarbons can be obtained 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 (^ -formed 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 from the stable modification I. of polybutene- (l) are present.

Exampleelto3

Two press plates made of polybutene- (1) with an absolute tensile strength of 26.3 kg / 1.5 cm sample width and a thickness of 1 mm are coated with styrene at 90 ° C, overlapped 1 cm and then Pressed for 10 minutes at the temperatures and pressures given in the table. The received The joint is not swollen and is therefore dimensionally accurate.

Example print tempera
door

(at) ( ⁰ C)

absolute
Tear resistance
(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

35

40 Examples 4 to 6

Two press plates made of polybutene- (1) with an absolute tensile strength of 26.3 kg / 1.5 cm sample width and a thickness of 1 mm with styrene and the activators given in the table coated, overlapped 1 cm and then pressed together for 10 minutes at 10 atmospheres and 90 ° C. Man receives parts with a hard adhesive joint and precise 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

0.1% benzoyl peroxide 24.5

0.1% azodiisobutyric acid dinitrile 24.2

0.1% lauroyl peroxide and 0.2% methanol 25.0

0.93
0.92
0.95

Example 7

stroked, overlapped 1 cm and then pressed together for 10 minutes at 10 atmospheres and 90 ° C. the

Two press plates made of polybutene- (l) with an 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

Solute tear strength of 26.3 kg / 1.5 cm sample width and a thickness of 1 mm are with a-methyl styrene, which contains 0.1% caprylic peroxide, fastening the press plate is 0.90.

Claims (2)

Patent claims: 1. Process for gluing parts made of polybutene- (I), according to patent 12 58 530, by treating the parts with an optionally polybutene- (I) containing liquid, optionally substituted hydrocarbon and joining at temperatures of 50 to 100 ^° C. under pressure , characterized in that n: an uses a polymerizable liquid hydrocarbon as the liquid hydrocarbon. 2. The method according to claim 1, characterized in that there is a polymerizable liquid hydrocarbon with a content of activators in amounts of 0.001 to 1 percent by weight used.