JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 50

environment

FRP recycling technology by dissolving resins under ordinary pressure
Since fiber reinforced plastics (FRP) have high strength and durability in lightness, it has been widely used for sporting goods, bathtubs, automobiles, railway vehicles, boats, etc. However, because thermosetting resins used for FRP neither melt nor dissolve, recycling of FRP is very difficult. Hitachi Chemical Co., Ltd. developed the technology that recovers materials from FRP by dissolving the resins.

By

50

RP is classified by the kind of the reinforced fibers. GFRP using glass fiber is the maximum production. Next, there are a lot of CFRP that uses carbon fiber. AFRP using aramid fiber is used in an architectural field. These FRPs can be recycled by the method of dissolving thermosetting resins under ordinary pressure.

Chemical recycling technologies of thermosetting resins are pyrolysis and solvolysis (table 1). They are often practiced with supercritical fluids. Pyrolyses damage fiber and filler because of high temperature. Table 1 Comparison of chemical recycling methods of thermosets Supercritical fluid methods require highPyrolysis Method Supercritical Fluid pressure vessels that are Gas phase Vegetable oil usually expensive. Solvolyses are carried out Temperature 180~400℃ 250~900℃ 350℃ under mild conditions. But they need long 2~22MPa closed,ordinary ordinary Pressure treating time without appropriate catalysts and water, alcohol, phenol Solvent no vegetable oil solvents, or require crushers and grinders. We regard cost efficiency as no Catalyst no no most important to put a recycling technology to Grinding size <1mm <10mm <5mm practical use; consequently we search Recyclate gas,oil oil monomer for a simple process.

KATSUJI SHIBATA HITACHI CHEMICAL CO., LTD. TSUKUBA RESEARCH LABORATORY RECYCLING TECHNOLOGY GROUP

The method of dissolving resins under ordinary pressure
In this method ester exchange reaction is used to dissolve the resins of FRP at 190°C under ordinary pressure. Tripotassium phosphate is used as a catalyst and benzyl alcohol as a solvent. These chemicals are both food additives. Depolymerised resins, fibers, fillers and metals are separated and recovered by this method. The processing time is from 5 hours to 20 hours, depending on the thickness, the kind of resins and manufacturing process of FRP. If FRP is previously ground, the processing time can be shortened, but the recovered GF is also shortened resulting in the low reinforcement. This method need neither preprocessing such as grinding nor an autoclave, and so it is economical. In addition, as the method is dust free, there is no risk of pneumoconiosis and dust explosion. Thus, this method is advantageous in the health and safety.

F

Comparison with Conventional Technologies

jec composites magazine / No66 July – August 2011

Solvolysis Liquid phase 200~440℃ ordinary~ 2MPa hydrogen donor solvent salt <5mm monomer, oil Glycolysis 150~250℃ ordinary~ 20MPa glycol acid or alkali <1mm Oligomer Our method 〈200℃ ordinary alcohol salt Oligomer



Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011

Cover
Edito
Point of view: Products for thermoplastic reinforcement
Contents
Agenda of Events
COMPANY & BUSINESS
- In Brief
- Aeronautics
APPLICATIONS
- Sports and leisure
- Civil engineering
MARKET
- Glass fibre
- Human Resources
- South America
- Sustainability
FEATURE AUTOMOTIVE
- Vessel
- Prepreg
- Software
- Thermoplastic
- Biocomposites
- High Performance
RESEARCH & DEVELOPMENT
- Process
- Environment
TECHNOLOGY & INNOVATIONS
- CNC
- Multiaxial
- Thermoplastic
- Traceability
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Cover
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 2
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Edito
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Point of view: Products for thermoplastic reinforcement
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 5
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Contents
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 7
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Ad1
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Ad2
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - In Brief
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Aeronautics
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 11
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Sports and leisure
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 13
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Civil engineering
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 15
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Glass fibre
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 17
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 18
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Human Resources
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - South America
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 21
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Sustainability
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 23
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 24
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 25
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Vessel
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 27
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 28
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Prepreg
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 30
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 31
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Software
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 33
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Thermoplastic
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 35
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 36
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 37
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 38
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 40
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 41
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 42
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 43
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 44
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 45
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - High Performance
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 47
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Process
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 49
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Environment
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 51
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 52
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - CNC
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 54
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 55
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Multiaxial
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Thermoplastic
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 58
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Traceability
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 60
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Index
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - In the world
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 63
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 64
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