SK627589A3 - Treatment method of mixtured plastic waste containing polyvinylidene chloride polymers - Google Patents

Description

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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for treating mixed plastic wastes comprising unusable polyvinylidene chloride (PVDC) -coated polypropylene (PP) foils in an amount of at least 15% by weight of PVDC-polymers by the addition of 5 to 40% by weight of an additive composition composed of 10% by weight of lubricants. araid type, 1% to 15% by weight. salts of higher fatty acids with metals 2 groups and 0% to 98.9% by weight. carbonates

The hydroxides of these metals 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 stresses that occur in the processing of polymers always produce hydrogen chloride, which causes corrosion of the processing equipment, significantly contaminates the working environment, and the product prepared from the polymer waste containing PVDC has very poor mechanical properties. For these reasons, no technological process for the treatment of plastic wastes containing PVDC polymers is known, which would allow their processing with conventional plastics technologies. Possible modification is indicated only by U.S.P. No. 4,643,861, which discloses improving the thermal properties and reducing the corrosion of devices by adding lime / Ca (OH) g / and metal group 2 carboxylates. Lack of this procedure.

produced plastic agglomeration. disadvantages are eliminated by the process of treating mixed plastic waste containing PVDC polymers and polypropylene; 2 by addition of 0.1 to 5% by weight of an amide-type glidant in a mixture with 1 to 15% by weight, salts of higher fatty acids with metals of 2 groups and 80 to 98.9% by weight · carbonates of Ca, Al, Mg 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 ·

Said additive mixture is added to the crushed mixed plastic waste in agglomeration in an aqueous suspension under a conventional plastic agglomeration process which is carried out on conventional agglomeration devices. The advantages are that the agglomerate thus produced can be used as a suitable raw material for products produced by extrusion, injection molding or compression molding. 1 a a. 7

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 admixed with a mixture of 90% by weight. lime and 10% by weight. 20% by weight of calcium stearate. in proportion to agglomerate according to U.SeP 4 * 643 # 861. When tested on a Brabender plastograph, the sample at 180 ° C degraded to 10 min. except that darkening of the sample was observed within 2 minutes. Said mixture was extruded into a hollow profile on a BU 0 32 apparatus at individual zone temperatures of 160 ° C, 170 ° C, 180 ° C. Under these conditions, it was not possible to produce the desired product since the foam mixture. In the following, the compression technology under the following conditions has been tested with the said mixture

temperature - 180 ° G heating - 10 min · pressure - 2.5 MPa pressing - 5 min. pressure - 5, P MPa cooling to 40 ° C - 10 min - pressure - 5.0 MPa

The molded part was totally degraded and the leaking bend of the equator greatly made the work environment unpleasant.

Example 3.

The agglomerate prepared according to Example 1 was admixed 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 based on the agglomerate · The mixture was heat-stressed on Brabender at 180 ° C C. Under these conditions, it was not possible to measure the Induction Period due to small variations in torque. Upon monitoring the discoloration, the sample changed color within 20 min. Said mixture was extruded into a hollow profile according to Example 2,

A profile was produced which met the conditions as a support in the gardens, the mixture was further compressed according to Example 2.

examples

The agglomerate prepared according to Example 1 was additivated with a mixture containing 4% by weight, erucylamide * 6% by weight, Ca-stearate and 90% by weight of Mg (0H) 2 in an amount of 30% by weight calculated on agglomerate. Brabender kneaders at 180 ° C. Torque after 35 minutes, and color change (sample black) within 20 minutes. The mixture was extruded into a hollow profile according to Example 2. The profile produced met the conditions required for gardening. The mixture was pressed according to the conditions of Example 2, the molding did not show signs of degradation and fulfilled the conditions for use in construction as heat and sound insulation.

Claims (1)

q \ /. £ NAKOK i i Efl VYNALEZU / j. f < tb > ______________________________________ < tb > ______________________________________ < tb > ______________________________________ < tb > ______________________________________ < tb > in the agglomeration apparatus there is added about 40% by weight of the mixture containing 0.1 to 5% by weight of cerucylamide, 1 to 10% by weight of the higher fatty acid salts of the 2-group metals and 85 to 98.9% by weight of the mixture. Ca / Al, Mg carbonates and / or hydroxides