Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/02—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers
  • B29C70/021—Combinations of fibrous reinforcement and non-fibrous material
  • B29C70/025—Combinations of fibrous reinforcement and non-fibrous material with particular filler
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B13/00—Conditioning or physical treatment of the material to be shaped
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B7/00—Mixing; Kneading
  • B29B7/80—Component parts, details or accessories; Auxiliary operations
  • B29B7/88—Adding charges, i.e. additives
  • B29B7/90—Fillers or reinforcements, e.g. fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B13/00—Conditioning or physical treatment of the material to be shaped
  • B29B2013/005—Degassing undesirable residual components, e.g. gases, unreacted monomers, from material to be moulded

Definitions

• the invention relates to a method and a device for processing a granular filler for the subsequent production of glass fiber reinforced plastic tubes, such as those used in wastewater technology.
• Glass-fiber reinforced plastic tubes, or GRP tubes for short are usually made from the following raw materials: glass fibers, fillers, resins.
• the starting materials are conveyed along pipelines, which are arranged in a loading arm, to a discharge end (head) of the loading arm and processed there (for example cutting the glass fibers), mixed and radially into one spinning rotating die.
• the tube jacket is built up to the desired thickness by alternating back and forth movement of the loading arm.
• the loading arm is then removed and guided into a new die, while the previously formed tubular body can harden and is then removed from the die.
• glass fiber strands glass fiber strands
• additives for example retarders, different fillers, etc.
• sand is usually used as filler, which is used in grain sizes ⁇ 1000 ⁇ m. This results in a relatively high, unfavorable viscosity for the sand flow. Attempts have therefore been made to partially replace the sand with other fillers, for example calcium carbonate, and to use calcium carbonate in smaller grain sizes ( ⁇ 250 ⁇ m). This accordingly requires an additional feed line in the loading arm.
• the object of the invention is to demonstrate a possibility of optimizing the processing and conveying of a granular filler for the production of GRP pipes, in particular in the sense of a reduction in the viscosity of the flow and an optimized mixing with the other starting materials.
• the invention is based on the finding that this aim can be achieved by premixing and predispersing the filler with a liquid resin, before it is fed into the feed arm (a delivery line). Due to the shear energy present in the dispersing mixer, there is extensive superficial wetting of the filler grains with the resin and, at the same time, a significant reduction in the viscosity of the flow rate by up to 1000 mPas and above.
• the invention relates to a method for processing a granular filler for the subsequent production of GRP pipes, in which the filler and a liquid resin are fed into a dispersing mixer, premixed there and then placed in a conveying line (of a feed arm).
• the filler and the resin should be treated in the dispersing mixer until the resin has wetted the filler grains on the surface.
• the filler can be introduced into the dispersing mixer in a grain fraction ⁇ 250 ⁇ m, in one embodiment ⁇ 200 ⁇ m.
• Calcium carbonate or dolomite are particularly suitable as fillers.
• the total amount of calcium carbonate in the filler can be increased compared to the prior art to the exclusive use of calcium carbonate or dolomite.
• a polyester resin can be used as the resin, for example a polyester resin with a viscosity of 100 to 1000 mPas.
• 100 parts by weight of resin and 150 to 250 parts by weight of filler are added to the dispersing mixer.
• the dispersing mixer is usually operated batchwise.
• the residence time of the mixture of filler and resin is a few minutes, and a characteristic reduction in viscosity during the dispersion treatment is possible down to values below 2000 mPas.
• the viscosity of the filler / resin mixture ie the filler grain coated with the resin, can be further reduced in a subsequent evacuation treatment.
• Another advantage of using calcium carbonate as a filler and treating it beforehand with a Liquid resin is that the filler can be used with a substantially constant, smaller grain size, so that the material properties of the pipe made from it can be evened out.
• the filler now also serves as a structural material for the GRP pipes to be manufactured (among other things because of the resin coating) and not only fulfills an exclusive filler function.
• a device for processing a granular filler for the subsequent production of GRP pipes comprises the following system parts:
• the single figure shows - in a schematic and perspective representation - a device for processing powdered calcium carbonate in a grain size ⁇ 200 ⁇ m for subsequent use in the production of flung glass fiber reinforced plastic tubes.
• Reference number 10 shows a silo for receiving the calcium carbonate, which has a conical outlet 10a at the lower end.
• a further silo 12 is arranged for receiving a liquid polyester resin with a viscosity between 100 and 1000 mPas, which also has a conical outlet 12a at the lower end.
• Delivery lines lead from both silos 10, 12 into a dispersing mixer 14 arranged underneath, only one delivery line 16 being shown in the figure, via which the resin is filled into the dispersing mixer 14.
• Weighing devices 18, 20 are arranged at the outlet end of the silos 10, 12, with the aid of which a preselectable mixing ratio between resin and filler is provided is set.
• the dispersing mixer 14 filler and resin are mixed intensively with one another.
• the surface of the calcium carbonate particles is wetted with the resin and, as a result, the viscosity of the mixture is reduced, which can be over 1000 mPas.
• the dispersing mixture is carried out over a period of 60 to 300 seconds and the mixture is then passed at the lower end of the dispersing mixer 14 via a delivery line 22 into a vacuum chamber 24, where the mixture is subjected to an evacuation treatment while simultaneously reducing its viscosity.
• An outlet 26 is arranged at the lower end of the vacuum chamber 24.
• the material flow is drawn off here and fed into a feed arm 32 with the aid of a filler pump 28 and a subsequent feed line 30, the transition from the feed line 30 to the feed arm 32 being shown only in broken lines.
• a further conveying line 34 can be seen, which represents a plurality of conveying lines which extend through the loading arm 32 to its discharge end (head) and the conveyance of further starting materials for the production of glass fiber reinforced Plastic tubes are used, for example for the transport of glass fibers (glass fiber strands).

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Composite Materials (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Processes Of Treating Macromolecular Substances (AREA)
• Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
• Reinforced Plastic Materials (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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Citations (9)

Family Cites Families (6)

• 1999
  • 1999-03-19 DE DE19912298A patent/DE19912298B4/de not_active Expired - Fee Related
  • 1999-09-13 TR TR1999/02231A patent/TR199902231A2/xx unknown
  • 1999-09-15 BR BRPI9904203-7A patent/BR9904203B1/pt not_active IP Right Cessation
• 2000
  • 2000-01-28 WO PCT/EP2000/000650 patent/WO2000056511A1/de active Application Filing
  • 2000-01-28 CN CN00801937A patent/CN1327411A/zh active Pending
  • 2000-01-28 AU AU26672/00A patent/AU2667200A/en not_active Abandoned

Patent Citations (9)

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