SK278593B6 - Method of treatment of the plastic waste containing polyvinyliden - Google Patents

Abstract

This patent describes a treatment of the plastic waste containing minimum 15 weight percent of polyvinylchloride polymers and polypropylene based on that principle, the above mentioned mixture is treated in the equipment used for agglomeration purposes with use of the additive in the quantity of 5 up to 40 weight percent, while this additive is a mixture consisting of 0,1 up to 5 weight percent of erucylamide, 1 up to 10 weight percent of salts closed to the higher fat acids produced based on these acids and the metal of the 2-nd group and 85 up 98,9 weight percent of carbonates and / or hydroxides related to Ca, Al, Mg. As a result of this procedure application a raw material is prepared, based on the plastic waste material unable of any other processing, and this raw material can be processed with the use of common standard technologies related to the plastic materials.

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a process for the treatment of mixed plastic wastes containing unusable polyvinyl chloride (PVDC) lacquered polypropylene (PPj films) in an amount of at least 15% by weight PVDC polymers by adding 5 to 40% by weight of an additive composition % of amide type, from 1% to 15% by weight of the higher fatty acid salts of the 2-group metals and from 80% to 98.9% by weight of the carbonates of Ca, Mg, Al and / or hydroxides of said metals.

BACKGROUND OF THE INVENTION

It is known that said polymeric wastes are particularly difficult to process due to the very low thermal stability of the PVDC-polymers used to improve the barrier properties of the films as well as the weldable layer. The thermal stress that always occurs in the processing of polymers generates hydrogen chloride, which causes corrosion of the processable equipment, greatly pollutes the working environment, and the product prepared from PVDC-containing polymeric waste has very poor mechanical properties.

Therefore, there is no prior art known method of treatment of plastic wastes containing PVDC polymers that would allow their treatment by conventional plastics technologies. A possible treatment method is suggested only by USP 4643 861, which discloses improving the thermal properties and reducing the corrosion of the apparatus by the addition of lime (Ca (OH) ₂ ) and carboxylates of Group 2 metals. The disadvantage of this process is the poor processability of the plastic agglomerate produced.

SUMMARY OF THE INVENTION

These drawbacks are overcome by a process for treating mixed plastic wastes containing PVDC polymers and polypropylene by the addition of 0.1 to 5 wt. % amide-type glidants in admixture with 1 to 15 wt. % of higher fatty acid salts with 2-group metals and 80 to 98.9 wt. % Ca, Al, Mg carbonates and / or hydroxides of said metals in an amount of 5 to 40 wt. to the total weight of the plastic waste mixture.

The additive mixture is added to the crushed mixed plastic waste by agglomeration in 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 products produced by extrusion, injection or compression.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Mixed plastic waste resulting from the manufacture of biaxially oriented polypropylene films by PVDC dispersions containing 40 wt. The PVDC polymers were 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 90 wt. % lime and 10 wt. % calcium stearate with an amount of 20 wt. in proportion to the agglomerate of U.S. Pat. No. 4,643,861. When tested on a Brabender plastograph, the sample degraded at 180 ° C within 10 min. except that darkening of the sample was observed within 2 minutes. The mixture was tested by extrusion onto a hollow profile on a BU 0 32 apparatus at single zone temperatures of 160 ° C, 170 ° C, 180 ° C. Under the above conditions, it was not possible to produce the desired product as the mixture foamed. In the following, the press technology was tested with the mixture under the following conditions:

temperature - 180 ° C

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

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

Example 3

The agglomerate prepared according to Example 1 was additivated with a mixture containing 4% erucylamide, 16% Ca-stearate and 80% CaCo ₃ in a laboratory mixer in a total amount of 20% by weight. calculated on 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. While observing the color change, the sample changed color only within 20 min. The mixture was tested by extrusion onto the hollow profile of Example 2. A profile was produced that met the conditions as a support in the gardens. The mixture was then pressed according to Example 2. The molding showed no signs of degradation and met the 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 on 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 to the hollow profile according to Example 2. The profile produced met the conditions necessary for support in the gardens. The mixture was molded according to the conditions of Example 2. The molding showed no signs of degradation and met the conditions for use in the building industry as thermal and acoustic insulation.

Claims (1)

PATENT CLAIMS Process for treating blends of plastic waste consisting of polyvinylidene chloride polymers in an amount of at least 15% by weight. and polypropylene, characterized in that 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 wt. carbonates and / or hydroxides of Ca, Al, Mg.