News Time2016.06.06 News Sources Views
Waste plastic has various forms and creates many recycling method, for the following examples for reference.
1, film recycling
Film is plastic products as one of the big Yang, phyletic and various, short service life of the general, is one of the main varieties of recycling use, according to the purpose, shape profile instance.
(1) agricultural film, agricultural film are mainly film and membrane, membrane mainly for PE film, shed modules have PE, PE/EVA, PVC film, when the recycling use, should distinguish the PE and PVC film, agricultural film are dirty, and often with clay, sand, grassroots, nails, wire, etc., to wash and remove the iron impurities and recycling method is mainly granulation, if, manual sorting, cleaning, the cleaning, waste film after drying can be directly by hot extrusion method production of plastic products, such as basin, barrels, plastic flange etc.
River waste recycled aggregate purposes as follows
1, PE recycled aggregate, PE recycled aggregate can be used for production of agricultural film, still can also be used to make fertilizer bags, garbage bags, agricultural renewable water pipe, fences, trees, POTS, barrels, dustbin, geotechnical material, etc.
2, PVC recycled aggregate, PVC recycled aggregate can be used to produce heavy bags, agricultural water pipes, soles, such as packaging film, packaging film materials including cellophane (" no Bin), PE, PVC, PP, EVA, PVDC, PA, PET, and various composite films. Single layer of a material of packaging film, in the sorting, after cleaning, can be as agricultural film made of plastic products directly or after granulation made from a variety of products. Composite film including different plastic composite film and plastic and paper, aluminum foil, and other material made of thin film, recovery after regeneration process more complicated, such as: multilayer plastic composite film, multilayer plastic composite film have PE/PP, PE/EVA/PE, PE / / PE/PA/binders, PP/PVDC, etc., before recycling, must first to separate different materials. Separation of solvent separation method.
Paper-plastic composite membrane, paper-plastic composite film in recycled paper-plastic separation before using it, it is also a method of separation of paper-plastic composite, separating equipment for one with a chrome plated hollow cylinder, electric heating cylinder is equipped with a hollow cylinder with blades, hollow cylinder and the cylinder in the opposite direction, after crushing paper-plastic mixture in cylinder, the cylinder when heated after the mixture of plastic melt in cylinder bottom discharging, the air inside the hollow cylinders will waste away.
Lu: su composite membrane, aluminum-plastic compound film BOPP/aluminum, PE/aluminum, etc., for a variety of food packaging, after use, lu: su composite flexible packaging bags is actually a kind of mixed waste, recycling is difficult. Processing methods abroad mainly for burning heat recovery. China has burned in aluminum and crushing join method of low-grade crude product packing system, the effect is not too ideal. Here is introduced using the electrical conductivity of the aluminum, examples of manufacturing antistatic function materials, the process is as follows: lu: su composite waste materials, cleaning, crushing, sieving, crumb, aluminium powder - auxiliaries, extrusion, semi-finished products, extrusion, the finished product. Lu: su composite waste, after washing, shattering 10 sieve screening, then aggregate, the process can be used plastic machinery factory Beijing aggregate machine. Crumb process conditions for water: 95 0 degree of water. 8 litres, charging time: 3 min. Extraction time 10 min, 5 min crushing time 15 kg each. With extruder extrusion, again after the granular material into semi-finished products, the semi-finished products add add 20% aluminum powder, flame retardant, compatibility agent and other additives, then through extrusion can be selected grain products, used as a conductive material.
In plastic industry, 3. PET film, PET is used primarily as a film and bottle, the film can be used for packaging, decoration, tapes or capacitor insulating, PET is also used as a photographic film base, PET is also a large number of used for fiber, film and viscosity of fibers with the physical properties of PET bottle with PET paper. So the recycling is slightly different.
PET film and fiber production plant scraps can be used to waiting for polyester/epoxy powder coating, generally these scraps of about 20000 people, the relative molecular mass of the melting point of 260 degrees or above, to form a single line of PET. Will the scraps from 250 to 250 degrees with multiple ChunChun, can get the relative molecular mass of about 2000 to 5000 of the low melting point polyester. In polyester in 200 to 220 degrees to join binary anhydride esterification and polycondensation, acid value, about 3. 05 mgKOH/g, softening point is about 85 to 105 degrees, the glass transition temperature less than or equal to 50 degrees, the product of this product is used for making polyester/epoxy powder coating.
Polyester/epoxy powder coating polyester formula
Raw material dosage of raw material consumption
PET scraps from 723.6 g binary anhydride 0.98 mol
1.71 mol catalyst 0.1% glycol
PET industrial waste also can be used as a binder. Japan Osaka city industry research institute and Fuji film company with PET industrial waste reaction adhesives, glycerin and used for metal bonding. PET industrial waste has two acid or ethylene glycol modified, can also produce hot melt adhesive, used in flexible material, such as cloth, leather, paper, plastic, aluminum, etc. Of the adhesive. The performance of the polyester/epoxy powder coating
Technical standard index name technical standard index name
Exterior level off, smooth, allowing a slight orange peel Gloss / % > 85
Fineness/mesh/mn 1 > 180 flexible
Curing time / 20/180 (min/oc) hardness > 2 h
Horizontal flow / / mm (oc) min) > 25/180-5 resistant to moisture (40 oc + - 2 oc, RH95 % + %) _3 / d 21
Acid leaching 25% - H2SO4 at room temperature for 90 days coating in good condition
Impact strength/kN/cm 50 25% alkali leaching NaOH4 90 days at room temperature coating in good condition
Adhesion (level) 1-2 resistant to salt water immersion 10 nacl at room 90 days coating in good condition
Waste PET film, or fiber with propylene glycol, styrene, glycerin, phthalic anhydride, maleic anhydride, hydroquinone and catalyst reaction can be made of unsaturated polyester, used to make artificial took away the stone. Recycling of waste PET film method also can be the reference of PET bottle recycling method.
Performance of polyester hot melt adhesive glue
Material bonding strength of adhesive strength
Shear strength/MPa tear strength (25 mm) N/shear strength/MPa tear strength/(N / 25 mm)
Cotton (plain weave), 3.07 (1) 3.07 (1)
Polyester 2.93 (1) 112.0 3.05 (1) tear PET film
Leather (MAO) 2.27 (2) 100 aluminum foil 12.90 (4), 126
Tape (raincoat) 2.83 2.83 (1) - (1)
Meet with canvas (account) 7.60 73.0 20.13 133 aluminum foil
Kraft paper, tin 11.85 1.93 1.93 (3) 12.2
(1) the material fracture values, the glue parts not cracking (2) cortex tear off (3) the paper layer (4) to plate sample test values
