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Polyamide beads and method for producing such beads

A polyamide and bead technology, used in chemical instruments and methods, earth-moving mining, transportation and packaging, etc., can solve problems such as application field limitations, and achieve improved mechanical properties, high mechanical properties, and high chemical resistance. Effect

Active Publication Date: 2012-11-28
马格卡拉公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these risks of die hole clogging in the "underwater pelletizing" process lead to limitations in the field of application, especially for pelletizing polymers with high melting points such as polyamides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The viscosity index IV of type 66 polyamide sold by RHODIA under the trade name STABAMID 27AE1 is 136 (at 25° C. in a Hubbelhode type viscometer, composed of 5 g / kg of polyamide dissolved in a mixture of 90% by weight formic acid and 10% by weight of water. l The solution of the polymer was determined) and the melting point was 263°C (determined by DSC method).

[0049] The polymer was melted at 308° C. with a twin-screw extruder with a diameter of 50 mm sold by the company Leistriz and fed to a gear pump sold by the company Maag. The gear pump feeds an underwater pelletizing unit sold under the trade name A5PAC 6 by the company GALA at a material pressure of 169 bar. The die head of the underwater granulation device has 32 holes with a diameter of 0.8 mm. The die was heated at a temperature of 345°C. The unit consists of a knife holder with 16 blades running at 5000rpm inside the cutting chamber. In the same cutting chamber, water at 76°C travels at 22m 3 / H flow c...

Embodiment 2

[0051] Copolyamide 66 / 6 containing 40% by weight of kaolin as mineral filler was melted at 329° C. with a twin-screw extruder with a diameter of 50 mm sold by the company Leistriz, which was fed with a gear pump sold by the company Maag. The gear pump fed the same underwater pelletizing apparatus as in Example 1 at a pressure of 91 bar, the pressure observed 3 seconds after feeding the polymer to the die. The die of the underwater pelletizer had 72 holes with a diameter of 1.2 mm and was heated at a temperature of 369°C. A knife block with 16 blades runs at 4500rpm inside the cutting chamber. In the same cutting chamber, water at 89°C travels at 11m 3 / h flow cycle. Under these conditions, for an extrusion flow rate of 420 kg / H, substantially spherical particles with a diameter equal to 1.5 mm were obtained.

Embodiment 3

[0053] Copolyamide 6 / 66 containing 40% mineral filler composed of kaolin was melted at 333° C. using the same twin-screw extruder as in Examples 1 and 2, which fed the same gears as in Examples 1 or 2 Pump. The gear pump fed the same underwater pelletizing apparatus as in Example 1 or 2 with a feed pressure of 135 bar. The die of the underwater pelletizing apparatus had 80 holes with a diameter of 1 mm and was heated at 389°C. A knife holder with 16 blades runs at 5000rpm inside the cutting chamber. In the same cutting chamber, 92°C water at 20m 3 / H flow cycle. Under these conditions, for an extrusion flow rate of 400 kg / H, granules with a diameter equal to 1.25 mm are obtained.

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Abstract

The invention relates to polyamide beads or granules and to a method for making such beads as well as to their use as a sustaining material for underground natural or artificial cracks of the Earth's crust essentially used for the extraction of hydrocarbons such as crude oil or natural gas. The invention relates to polyamide beads having a spherical or ellipsoidal shape and having a surface free of concave portions, advantageously having a uniform shape, and having a mean diameter lower than or equal to 1.7 mm and a porosity lower than 0.1 ml / g. The invention also relates to a method for making such beads using a brad-head cutting device.

Description

technical field [0001] The present invention relates to polyamide beads or granules and a process for the preparation of these beads, as well as their use as proppants for natural or artificial subterranean fractures of the earth's crust, especially for the production of hydrocarbons such as oil or gas . [0002] The present invention more particularly relates to small diameter beads having a regular shape. Background technique [0003] Thermoplastic polymers such as polyamides are very important materials for the manufacture of numerous articles used in many fields. These articles are generally obtained by shaping from molten polymers, for example in spinning, extrusion, molding processes. [0004] Generally, the raw material used to produce these articles, especially for feeding molding equipment, is in the form of polymer pellets by casting the molten polymer leaving the polymerization equipment in the form of rods (jonc) and casting these rods Obtained by cutting into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/06B29B9/12C08J3/12E21B43/267
CPCC08J3/12C08J2377/06B29B2009/125B29K2077/00B29B9/12B29B9/065B29B9/14B29L2031/772C08G69/26C08K3/34C09K8/80Y10T428/2982
Inventor J-F·埃斯蒂尔E·罗什M·埃洛B·德鲁舍尔
Owner 马格卡拉公司
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