Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K9/00—Use of pretreated ingredients
  • C08K9/08—Ingredients agglomerated by treatment with a binding agent
• • 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
  • B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
  • B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
  • B29B15/10—Coating or impregnating independently of the moulding or shaping step
  • B29B15/105—Coating or impregnating independently of the moulding or shaping step of reinforcement of definite length with a matrix in solid form, e.g. powder, fibre or sheet form
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/07—Flat, e.g. panels
  • B29C48/08—Flat, e.g. panels flexible, e.g. films
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/94—Lubricating
  • B29C48/95—Lubricating by adding lubricant to the moulding material
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
  • C03C25/10—Coating
  • C03C25/24—Coatings containing organic materials
  • C03C25/26—Macromolecular compounds or prepolymers
  • C03C25/28—Macromolecular compounds or prepolymers obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • C03C25/30—Polyolefins

Definitions

• the present ivention relates to the use of pre-treated, chop ⁇ ped strand fibreglass made from-monofilament roving, and/or monofi . _nts, suitable for the reinforcement of thermo ⁇ plastic oducts to eliminate mechanical wear in processing machine- . and to result in a cleaner end product.
• European patent application No. 0036097 describes a process in which fibreglass (monofilaments) , after leaving the spin ⁇ nerets, is fed into a tank containing a watery solution of polyolefine, silan and bis-maleic acid, whereby the surface of the fibreglass strands are coated, ensuring affinity between the fibreglass and plastic material in the finished product. After this pre-treatment of the fibreglass, and
• OMPI after it has been dried and is moisture free. It must be cut into chopped strand, and then dry-blended with the plastic compound in a known manner, at room temperature. This is a normal and well-known procedure in the plastics industry.
• the innovation concerns the use of bis-maleic plastic compound.
• West German patent No. 2,202,860 describes a method of pro ⁇ ducing fibreglass reinforced plastic sheeting in which the top layer consists of a special extruded blend of- 10 weight percent chopped strand and 90 percent plastic. This fibre- glass/plastic blend is produced by the usual process of dry blending before it is poured into the extruder hopper.
• U.S. patent No. 3,396,142 relates to a process in which fibreglass is blended with a solid thermoplasticpolymer in order to obtain certain properties in the finished product.
• the above patens have in common that they are based on the usual, known methods of dry blending fibreglass and plastic at room temperature. In these inventions the intention is to increase the affinity between fibreglass and plastic thereby increasing the mechanical strength of the finished products.
• processing machinery is used above. This is mechani ⁇ cal equipment for the compression and melting of plastic com ⁇ pounds suitable for extruding or injection moulding. Tnus, in this context, processing machinery means extrusion and injec ⁇ tion moulding ' equipment for plastics.
• OMPI IPO mentioned EPO patent application can be used to advantage to prevent wear in plastic processing machinery.
• such coated fibreglass is pro ⁇ **d by heating the chopped strand to 320°C and then blen ⁇ ding with PVC compound in a slow mixer, whereby the plastic is sintered to. the fibreglass strands.
• Example 1 in which this production sequence is described.
• the raw material used must be thermoplastic.
• thermoplastic Of such materials, polyamide, polycarbonate, polyacetates, polypropylene, poly ⁇ styrene, polyacrylnitrile-butadiene-styrene and polyvinyl- chloride are the most suitable for the purpose, but the inven ⁇ tion does not impose limits on choice of thermoplastic mate ⁇ rial. The only condition is that it must be thermoplastic.
• the fibreglass used is of the kind used for plastic reinforce ⁇ ment. It is usual to employ a type of fibreglass whose surface is specially treated by the supplier. Fibreglass is either supplied as roving (endless strands) or as chopped strand. For the production of reinforced plastic, 3 mm is usually con ⁇ sidered to be an acceptable length, but the fibre length may be shorter or longer than this. Such chopped strands will usually vary between 1-5 mm.
• the present invention is not dependent on the type of fibre ⁇ glass used being either pure monofilament or roving, since a mixture of both types is normally present in the finished product sold.
• Grain size 5-50 ,um is therefore considered to be best suited for the sintering, but larger or smaller grains may be used, as efficient coating is not only dependent on grain size, but also in the length and thickness of the fibres.
• Chopped strand fibreglass with an average strand length of 3 mm is pre-heated in a known manner by means of hot air in a suitable apparatur to approx. 160°C.
• the fibres When the fibres reach the correct temperature, they are sprinkled into a tank con ⁇ taining E-PVC compound having a granular distribution of 5-50 /u .
• the blending ratio is one part fibreglass to one part PVC compound.
• the compound must be agitated constantly during the sprinkling and sintering process.
• the sin ⁇ tering process is completed, the coated fibreglass is separa ⁇ ted from the unused E-PVC compound.
• Coated fibreglass, produced in accordance with Example 1 is blended with pure thermoplastic granulate in a G ⁇ ttfert twin screw extruder and the melt is extruded through nozzles in the usual manner.
• samples are taken of the extruded material and expressed in iron content in ,ug Fe per gram material, i.e. pp .
• E-PVC sintered to the fibre ⁇ glass was used (Test No. 4), E-PVC being a polyvinylchloride produced on the emulsion principle.
• Table 2 shows that mechanical wear in processing machinery is eliminated when plastic coated fibreglass is used relative to the invention (Test No. 4).

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Life Sciences & Earth Sciences (AREA)
• Polymers & Plastics (AREA)
• Medicinal Chemistry (AREA)
• Health & Medical Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• General Chemical & Material Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Materials Engineering (AREA)
• Reinforced Plastic Materials (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Moulding By Coating Moulds (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19887025

Family Applications (1)

Country Status (6)

Cited By (1)

Citations (4)

Family Cites Families (1)

• 1983
  • 1983-03-28 NO NO831132A patent/NO152127C/no unknown
• 1984
  • 1984-03-26 WO PCT/NO1984/000017 patent/WO1984003858A1/en active IP Right Grant
  • 1984-03-26 EP EP84901239A patent/EP0140913B1/en not_active Expired
  • 1984-03-26 DE DE8484901239T patent/DE3479975D1/de not_active Expired
  • 1984-11-27 DK DK561384A patent/DK155580C/da active
  • 1984-11-28 FI FI844674A patent/FI76730C/fi not_active IP Right Cessation

Patent Citations (4)

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