Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
1997-01-21
1998-09-01
Cain, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
524 59, 524 62, C08J 1104
Patent
active
058012044
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
This is a U.S. National Phase of International Appln. No. PCT/FI95/00383 filed Jul. 3, 1995 and claiming priority of Finnish applicatin 943413 filed Jul. 19, 1994.
BACKGROUND AND SUMMARY OF INVENTION
The object of the present invention is a method for treating waste plastic material, such as polyethene, polyamide, polystyrene, PVC, acrylic and PET plastic material contained in reclaimed waste, so as to make possible its utilisation, for example, as a binder component in road surfacing materials or as fuel.
The invention also relates to a road surfacing material binder composition and a fuel composition in fluid form.
For reasons of environmental protection and energy saving, the aim is to reclaim and re-use waste plastic such as packaging materials and industrial waste plastic. In some cases, thermoplastics can be re-used subsequent to a purification process. In most cases, however, plastic is waste which is used for suitable applications as filler material or fuel.
It has previously been suggested that plastic be used in road surfacings to improve their quality, for example, for reinforcement. It has also been suggested that waste plastic be finely shredded and mixed as such with bitumen, as an emulsified aqueous solution with emulsion bitumen, or dissolved with solvents and mixed with bitumen.
It is very difficult to mix finely shredded waste plastic evenly in bitumen. The plastic mixes incompletely or is distributed unevenly in the composition, which makes the binder composition difficult to handle and the desired reinforcement of the road surfacing is not achieved.
The plastic can be distributed, or dispersed, evenly in the bitumen through dissolving. However, the solvents that have previously been suggested for use have their drawbacks--many are toxic, some cause the properties of bitumen to deteriorate or the amounts required are relatively large.
Finnish patent application FI 922455 proposes the use of tall resin, wood resin, gum rosin, tall oil or their derivatives as solvents in dispersing waste plastic in bitumen. These substances are, however, required in relatively large amounts to achieve the desired solvent effect.
It has previously also been suggested that waste plastic be burned. However, feeding and dosing finely shredded waste plastic into an incineration plant is difficult. Feeding waste plastic requires its own feeding apparatus and it cannot be used, for example, as fuel for an oil boiler.
The aim of the present invention is to overcome the above problems.
The aim is especially to provide a method by means of which waste plastic can be made a more suitable component of bitumen-based or similar road surfacing materials and/or fuel.
A further aim of the invention is to provide an improved binder composition containing waste plastic, as compared to those presented above, for use as a binder in road surfacing material.
A still further aim of the invention is to provide a new liquid fuel composition containing waste plastic.
To achieve the aims presented above, the method, the binder composition and the fuel composition relating to the invention are characterized by what is defined in the claims presented below.
DETAILED DESCRIPTION OF THE INVENTION
By means of the method relating to the invention, waste plastic material is made at least partly fluid by mixing with it a solvent consisting mainly of products such as crude fatty acids obtained as by-products in refining fats, or fatty acids or pitch obtained in distilling hydrolysed fats;
In the method relating to the invention, natural fats or the fatty acids or other constituents formed in refining them are used as the solvent or dispersing agent of the waste plastic material for dispersing the waste plastic, for example, in bitumen or fuel oil.
By-products or waste produced by the food industry or in processing or refining food products or food product raw materials can often by used as solvents in the method relating to the invention. The invention thus makes possible the utilisation of waste.
REFERENCES:
patent: 4018722 (1977-04-01), Baker
patent: 5226926 (1993-07-01), Matsuzaki
patent: 5226927 (1993-07-01), Rundstrom
Johansson Jan-Erik
Paatero Jaakko
Cain Edward J.
Raisio Chemicals Oy
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