Direct feed of carbon black in the production of black mixtures for pipe and wire and cable applications
A technology of polymer and composition, applied in the field of new technology, can solve the problems of mechanical strength and rigidity decline
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no. 1 approach
[0142]According to the first aspect of the present invention (steps (a1)-(a4)), the free-flowing pigment ((n)FFP) and solid polymer (sP) are fed into the same inlet of the melt extruder (step ( a1)). More preferably, the free-flowing pigment ((n)FFP) and the solid polymer (sP) are fed simultaneously to the same inlet of the melt extruder (step (a1 )). The feed inlet is preferably the main feed inlet of the melt extruder such as eg a hopper. When free-flowing pigment ((n)FFP), preferably pure free-flowing pigment (nFFP), and solid polymer (sP) are fed to the feed inlet, preferably the main feed inlet such as a hopper, of the melt extruder In addition, other components can also be added. For example, other components are optional further polymers or optionally other additives different from the solid polymer (sP). These other components may also be fed via the same feed or other feeds such as side feeders. In a preferred embodiment, a free-flowing pigment (FFP), preferably a...
no. 2 approach
[0149] According to another aspect of the invention (steps (b1)-(b5)), a (pure) free-flowing pigment ((n)FFP) and a solid polymer (sP) are combined, whereby a free-flowing pigment ((n)FFP) is obtained ( n) Mixture (M) of FFP) and solid polymer (sP) (step (b1)). It is evident from the meaning of the word mixture (M) that the two components are present in their own form until the mixing is complete and are thus (loosely) in contact with each other. Thus, the mixture (M) is a dry mixture of free-flowing pigment ((n)FFP) and solid polymer (sP). By combining a free-flowing pigment ((n)FFP) and a solid polymer (sP), the solid polymer (sP) does not melt. This mixture (M), ie dry mixture, can be stored or used immediately in step (b2). Combining can be done through the delivery device (CM). The conveying means (CM) can be any conventional device with mechanical means to convey the mixture (M) to the feed opening of the extruder (e.g. mechanical means inside and / or outside the conve...
Embodiment
[0179] 1. Definition / measurement method
[0180] Unless otherwise stated, the following definitions of terms and determination methods apply to the above general description of the invention as well as to the following examples.
[0181] MFR 2 (230°C) Measured according to ISO 1133 (230°C, 2.16 kg load).
[0182] MFR 2 (190°C) Measured according to ISO 1133 (190°C, 2.16 kg load).
[0183] MFR 5 (190°C) Measured according to ISO 1133 (190°C, 5kg load).
[0184] FRR 21 / 5 is MFR 21 (190°C) and MFR 5 (190°C) melt flow ratio [MFR 21 / MFR 5 ].
[0185] MFR 21.6 (190°C) Measured according to ISO 1133 (190°C, 21.6 kg load).
[0186] Density was determined according to ISO 1183-1 - Method A (2004). Sample preparation was performed by compression molding according to ISO 1872-2:2007.
[0187] Pigment (especially carbon black) content is determined according to ASTM D1603.
[0188] The degree of dispersion of pigments (especially carbon black) in polyolefin pipes is determ...
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