CZ627589A3 - Process for treating mixed plastic waste containing pvdc polymers - Google Patents

Abstract

In the present invention there is disclosed a process for preparing a mixed plastic waste based on polypropylene and polyvinylidene chloride containing at least 15 percent by weight polyvinylidene chloride. The invented process is characterized by addition 5.0 to 40.0 percent by weight based on agglomerate total weight polyvinylidene chloride, 0.1 to 5.0 percent by weight mixtures of sliding agents based on amides, 1.0 to 10.0 percent by weight higher fatty acids, and 85.0 to 98.5 percent by weight metal carbonates or metal hydroxides.

Description

(57) A mixture of plastic waste containing at least 15% by weight of plastic waste. PVDC polymers and PP are treated in a conventional sintering plant by adding 5 to 40 wt. % of a mixture containing 0.1 to 5 wt. % erucylamide, 1 to 10 wt. salts of higher fatty acids with 2-group metals and 85 to 98.9% of carbonates and / or hydroxides of Ca, Al, Mg.

BACKGROUND OF THE INVENTION 1. Field of the Invention % of amide type glidants, 1% to 15% of higher fatty acid salts of 2-group metals and 80% to 98.9% of Ca, Mg, Al and / or hydroxides of said metals.

It is known that these polymeric wastes are particularly difficult to process due to the very low thermal stability of the PVDC polymers, which are used to improve the barrier properties of the films, as well as the weldable layer. , which causes corrosion of the process equipment, significantly pollutes the working environment and the product prepared from PVDC-containing polymeric waste has very poor mechanical properties.

For these reasons, there is not yet known such a technological method of treatment of plastic wastes containing PVDC polymorphs that would enable their processing by conventional plastic technologies. Only USP 4643 861, which discloses improving thermal properties and reducing the corrosion of equipment by the addition of lime (Ca (OH) ₂ ) and metal group 2 carboxilates, suggests a possible treatment method.

The above drawbacks are eliminated by the treatment of mixed plastic wastes containing PVDC-polymers and polypropy2 by the addition of 0.1 to 5% by weight of an amide type glidant in a mixture of 1 to 15% by weight of higher fatty acid salts of metals of 2 groups and 80 to 98, 9% by weight · Ca, Al, Mg carbonates and / or hydroxides of said metals in an amount of 5 to 40% by weight * based on the total weight of the plastic waste mixture ·

The additive mixture is added to the crushed mixed plastic waste during agglomeration! in an aqueous suspension! in a conventional plastic agglomeration process carried out on conventional agglomeration equipment. The advantage lies in the fact that the agglomerate thus produced can be used as a suitable raw material for extruded, injection molded or molded products.

Example 1.

The mixed plastic waste resulting from the production of biaxially oriented polypropylene films by PVDC dispersions containing 40% by weight of PVDC polymers was agglomerated in a conventional manner. The agglomerate was tested on a Brabender plastograph at 180 ° C to determine the induction period. · The sample spontaneously decomposed at this temperature and the sample could not be evaluated

Example 2.

The agglomerate prepared according to Example 1 was additivated with a mixture of 90% by weight lime and 10% by weight calcium stearate in an amount of 20% by weight relative to the USP 4,643,861 agglomerates. except that darkening of the sample was observed within 2 minutes. Said mixture was extruded to a hollow profile on a BU 0 32 at single band temperatures of 160 ° C, 170 ° C,

Mp 180 ° C. Under the above conditions, it was not possible to produce the desired product as the mixture foamed. In the following, the molding technology was tested with the mixture under the following conditions:

temperature - 180 ° C

time - heating - 10 min. pressure - 2.5 MPa pressing - cooling to 5 min. pressure - 5.0 MPa Deň: 32 ° C 10 min. pressure - 5.0 MPa

The molded part was completely degraded and the escaping hydrogen chloride made the work environment unpleasant.

Example 3.

The agglomerate prepared according to Example 1 was additivated with a mixture containing 4% erucylamide, 16% Ca stearate and 80% CaCO 2 in a laboratory mixer in a total amount of 20% by weight. calculated in agglomerate. The mixture was thermally stressed on a Brabender plastograph at 180 ° C. Under these conditions it was not possible to measure the induction period due to small torque changes. When monitoring the change in color, the sample changed color within 20 min. The mixture was tested by extrusion to the hollow profile of Example 2.

A profile was made to support the conditions as a support in the gardens. The blend was further pressed according to Example 2. The molding showed no signs of degradation and spinal conditions for use in the building industry as thermal and acoustic insulation.

Example 4.

The agglomerate prepared according to Example 1 was additivated with a mixture containing 4 wt. % erucylamide, 6 wt. Ca stearate and 90 wt. Mg (OH) ₂ in an amount of 30 wt. calculated in agglomerate. The mixture was tested on a Brabender laboratory kneader at 180 ° C. Torque drop occurred after 35 min. and color change (sample blackening) within 20 min. The mixture was tested by extrusion on a hollow profile according to Example 2. The profile produced met the conditions required for support in the gardens. The mixture was molded according to the conditions of Example 2. The casting showed no sign of degradation and spinal conditions for use in the building industry as thermal and acoustic insulation.

Claims (1)

PATENT CLAIMS Process for treating mixed plastic waste consisting of PVDC polymers in an amount of at least 15% by weight. and PP, characterized in that said mixture is treated in a conventional sintering plant by the addition of 5 to 40 wt. % of a mixture containing 0.1 to 5 wt.% of erucylamide, 1 to 10 wt. salts of higher fatty acids with 2-group metals and 85 to 98.9% of carbonates and / or hydroxides of Ca, Al, Mg. apiikícta