DE3919995A1 - Recycling scrap plastics into sheeting - by mixing primarily ground thermoplastic waste with universal chemical modifier and glass fabric before processing into continuous sheet - Google Patents

Abstract

Light-weight scrap plastic materials and/or elastomers are recycled by converting into technically reusable material and into mouldable plastic sheets in particular. A universally applicable chemical polymer modifier enables non-compatible plastic materials to be crosslinked and to use a continuous process in which the material is reinforced with glass mat, fabric or non-orientated fibres. The process minimises any effect on the mechanical properties of sheets produced where impurities are present which can not be bonded chemically by the polymer modifier concerned. ADVANTAGE - The method widens the range of application for universal polymer and modifier and contaminated scrap material; it minimises the effects of contamination.

Description

a. Title: Process for the technical recycling of plastic and / or light waste containing elastomer. b. field of use

The invented process is used for conversion of plastic and / or elastomeric light waste in semi-finished products to be used technically, in particular the Conversion of light waste into formable plates.

c. State of the art

It is known to be incompatible thermoplastic polymers by adding chemically active Polymer modifiers chemically with each other under the influence of heat can be connected (networked) and thus new types of polymer can be generated, which new in their properties are defining.

It is also known that there is currently only one worldwide chemically effective universally applicable polymer modifier exists, which allows different, usually incompatible thermoplastic polymer types with each other connect chemically.

State of the art is that continuously working pressing processes can be carried out there enable, with targeted supply of heat with simultaneous Applying pressure, introducing glass fiber fabric into thermoplastics. The semi-finished product thus produced in plate form (thermoplastic with Glass mat or glass fabric reinforcement or long glass fiber reinforcement) is suitable for subsequent hot forming and offers the advantage due to the type of reinforcement higher degrees of deformation than this with extruded or injection cast plates can be achieved.  

d. Critique of the state of the art

Both of the above Technologies, chemical compound of incompatible thermoplastics and Manufacture of glass fiber or glass mat reinforced thermoplastic sheet material (GMT for short) have so far not merged into one process.

The use of a chemically active polymer modifier was So far only tested in the injection molding and extrusion process. Thereby, light and waste containing thermoplastic and / or elastomer, e.g. B. waste from PVC cable sheathing, waste from old tires, Waste from painted vehicle plastic bumpers, too sprayy castable thermoplastic materials using / Transfer of the polymer modifier converted.

However, the materials thus obtained contain due to lack of separation from not using polymer modifier parts to be chemically bonded (e.g. thermosets, minerals, Metals, paint particles), inclusions. The through such The mechanical inclusions can cause contamination Adversely affect properties of the material obtained in this way and thus lead when using injection molding or Extrusion process, for the production of technically subordinate Share. The application area of this, made of plastic / light waste containing elastomer and / or rubber Novel materials produced are therefore severely limited.

e. task

The invention has for its object that Area of application for new types of light waste using a universally applicable polymer modifier, however, significantly increase contaminated materials. It should be achieved that the influence o. G. Ver dirt (inclusions) is minimized.

f. solution

The object is achieved by the link of the two above Technologies solved. The use of a universal polymer modifier (available on the market at the brand name BENNET of the form HIGH TECH PLASTICS in NL / AD-Ede) enables the conversion of thermoplastic / elastomer and / or rubber-containing light waste in injection molding or extrudable materials whose field of application has emerged contained foreign inclusions (impurities), however is limited and which is in this form in a warm Have the forming process processed only to a limited extent.

The pressing process enables the introduction of glass mats or glass fiber fabrics in thermoplastics and enables the production of plastic plates in a continuous process, which is followed by Hot forming can be processed further. The degree of deformation such plate material is larger than one unreinforced or reinforced with short glass fibers.

G. Description of the procedure

The procedure serves that technical recycling of light waste, which is in large quantities in the Household waste, as well as in vehicle shredding processes and / or components of motor vehicles. The too Recycled light waste initially does not deliver defining mixture of materials of all kinds. For that Invented methods simplify the following properties of the Process engineering implementation:

The light waste to be added to the process should (not mandatory) as follows

• - free of metallic particles,
• - predominantly thermoplastic components,
• - ground / powdered for treatment as bulk material and for Improvement of the homogeneous mixability.

If the amount of polymer in light waste is less than 25 Percent by weight, then an addition of thermoplastic Plastics recommended. The batch is pulverized and with a polymer modifier, which is the chemical crosslinking different polymers allows mixed. The The addition of the polymer modifier depends on the Manufacturer information.

For further processing of the powdered and with Polymer modifier mixed light waste offers two opportunities

• 1. the batch is with max. 50 weight percent with one Thermoplastic and / or an elastomer / rubber in granular form blended, melted in an extruder and homogenized and as a liquid melt through a nozzle (usually Slot die) extruded onto a glass fiber fabric,
• 2. The batch produced is in with the polymer modifier Granulate form blended as bulk material on a glass fiber fabric sprinkled or melted and onto a glass fiber fabric poured. It is passed through a downstream extruder a slot die extrudes a polymer melt.

With a view to later hot forming of the plate material can be a fiberglass fabric with non-directional fiber orientation Advantages.

The correspondingly treated 1st or 2nd glass fiber fabric is one Calender or fed a double belt press. A continuous feed into the machine should be guaranteed.

H. Description of one or more exemplary embodiments: according to Sketches in the letter dated June 16, 1989. i. achievable advantages

The advantages achievable with the invention consist in particular in that by the introduction of Glass mats, glass fiber fabrics or non-directional long glass fibers the influence of dirt on the mechanical properties one made of light waste using a chemical one universal polymer modifier manufactured plastic is minimized. This results in advantages in terms of more extensive recycling of plastic, not sorted waste through conversion into technically usable Semi-finished plastic products (plates).

Claims (2)

General term: Process for the conversion of plastic and / or elastomer-containing light waste in technically reusable Semi-finished products, especially the conversion of light waste into malleable plastic sheets. Characteristic part:

• 1. The method is characterized in that the starting product is a plastic and / or elastomer and / or rubber-containing light waste.
• 2. The method is characterized in that a universally applicable chemically active polymer modifier enables the crosslinking of otherwise incompatible plastics.
• 3. The method is characterized in that a material produced from a starting product according to point 1 using a substance according to point 2 is fed to a continuous pressing process and is reinforced during the pressing process with glass fiber mats, glass fiber fabrics or unoriented long glass fibers.
• 4. The method is characterized in that it minimizes the influence of foreign impurities, which cannot be chemically bound by the polymer modifier mentioned in point 2, on the mechanical properties of plastic sheets.