Production of an adhesive based on solid epdm rubber
A technology of pressure-sensitive adhesives and rubbers, applied in the direction of adhesives, film/sheet adhesives, pressure-sensitive films/sheets, etc., can solve problems such as unsuitable preparation
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preparation example Construction
[0083] Contrary to other customary production methods, it is believed that in the planetary roller extruder, according to the process according to the invention, there is at most a slight mastication of the rubber, since here the rubber is not subjected to high shear energy alone, but together with Lubricating components are processed together. Due to the presence of these lubricating components, the degree of frictional energy is limited in such a way that the mastication of the rubber, i.e. the breakdown (degradation) of the molecular weight of the elastomer, can be kept low and high resulting compounding ratios can also be avoided. Mix temperature. Therefore, it is preferred that the first lubricating component or at least a portion thereof is fed or added to the first lubricating section of the filling section or the compounding section, usually through an injection ring located between the filling section and the first roller or via a side feeder. roller. Particularly p...
Embodiment
[0105] A planetary roll extruder from Entex Rust & Mitschke with three connected rolls with an inner diameter of 70 mm was used. The first two rollers are each equipped with 7 planetary shafts, the following rollers are equipped with 6 planetary shafts, one of the shafts having the geometry of the mixing element. In this embodiment, the filling section of the planetary roller extruder has a conveying screw on which the addition of material can be metered. The temperature control medium used for the central shaft and the filling zone in each of the experiments was water with an entry temperature of 15°C.
[0106] The raw materials used were characterized as follows (Table 1):
[0107]
[0108] Table 1: Raw materials used.
Embodiment 3
[0117] The difference between embodiment 3 of the present invention and comparative example 2 is that the solid EPDM rubber 6602 was melted at 190°C in a single screw extruder (Blaake single screw extruder ES45 / 25D) before being fed to the filling section of the planetary roll extruder, thus fed as a melt to the planetary roll extruder. Getting out of the plane. In addition, the entire amount of Regalite Resin (140.6phr) was metered in molten form (tank temperature 130°C) into the second stop ring between the second and third rollers with a throughput of 4.0kg / h; in other words, no tackification The resin is fed into the packing section of the planetary roll extruder. The wall temperature of the rollers of the planetary roller extruder was 140°C. The central shaft is driven at 45 rpm. The resulting PSA had a temperature of 100° C. at the outlet of the planetary roller extruder. All other details are identical to Comparative Example 2.
[0118] A single-sided tape was t...
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Abstract
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