Method of semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions

An extrusion molding, microporous plastic technology, applied in the field of the preparation of open-celled microporous plastic products, can solve the problems of difficult micropore diameter and opening rate, complex process, long process, etc., and achieves easy degradation and simple process. , the effect of low molding temperature

Inactive Publication Date: 2008-07-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] There are two main problems in the above method of preparing open-cell microporous plastic products: 1, complex process, long flow process, high cost, such as compression-sintering-extrusion molding method and physical or mechanical perforation method; 2, micropore diameter and The porosity is difficult to control according to the product application, such as physical foam continuous extrusion method, chemical foam molding method

Method used

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  • Method of semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Dry the 40-mesh ABS (Chimei 757) powder in an oven at a temperature of 90°C and a vacuum of 0.03MPa for 6 hours, then weigh 100 parts, and mix it with 2 parts of 10% ABS-tetrahydrofuran solution and 3 parts of sebacic acid Dibutyl ester and 3 parts of azodicarbonamide (ADC) are poured into an electric heating high-speed mixer and mixed for 5 minutes. At the same time, when the temperature is preheated to 80°C, discharge the material; put the preheated mixture into a dry insulator , at a temperature of 60°C and a relative humidity of 15%, the storage time is 1 hour; the stored mixture is placed in a vacuum suction feeding device with a constant temperature of 175°C, and a hydraulically driven double-plunger extruder is used. The raw material is extruded into a plate with a thickness of 4mm through the plate head, the die, the vacuum water tank for shaping, the crawler tractor, and the guillotine cutting device. Molding conditions: barrel temperature 180-210°C, head and d...

Embodiment 2

[0038] 100 parts of 120 mesh polyvinyl chloride resin powder and 3 parts of di-n-butyltin dilaurate, 2 parts of epoxy soybean oil, 3 parts of 20% PVC-dioctyl phthalate / tetrahydrofuran (=1:6) solution, 4 parts of methyl phenyl silicone oil and 6 parts of benzenesulfonyl hydrazide (BSH), pour into the electric heating high-speed mixer and mix for 8 minutes, and at the same time, when the temperature is preheated to 60 ° C, unload; put the preheated mixture into In a drying incubator, the storage time is 5 hours at a temperature of 45°C and a relative humidity of 50%. The stored mixture is placed in a blast-type feeding device with a constant temperature of 120°C, and squeezed by a hydraulic cylinder-driven double plunger. Out of the machine, the cross-section is a rectangular frame profile die, multi-plate type shaping, crawler tractor, and circular saw type cutting device to extrude a profile with a wall thickness of 1.5mm and a cross-section of a rectangular frame. Molding con...

Embodiment 3

[0040] Pour 100 parts of 60-mesh ultra-high molecular weight polyethylene powder, 3 parts of naphthenic oil and 2 parts of ethyl silicone oil into an electric heating high-speed mixer and mix for 8 minutes. Put the preheated mixture in a dry incubator at a temperature of 65°C and a relative humidity of 55%, and store it for 10 hours; put the stored mixture into a forced feeder device with a constant temperature of 120°C, and use a hydraulic cylinder The driven double-plunger extruder extrudes a pipe with a wall thickness of 2.0mm and an inner diameter of 10mm through a ring-shaped pipe die with a cross-section, a calibrating sleeve for shaping, a crawler tractor, and a circular saw cutting device. Molding conditions: barrel temperature 130-145°C, head and die temperature 145-180°C, pressurization pressure 100-150MPa, shaping section temperature 70-90°C, stretch ratio 1.5. The pore diameter of the obtained perforated microporous pipe is 5-50um, and the porosity is 20±5%.

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Abstract

The invention relates to a method for preparing opening micropore plastic material though slack-melting, extruding and molding. The method includes the processes: after reaching from a feeding device arranged on a double piston extruder to a heating material cylinder, preheating plastic powder with particle size of 40-1500 meshes is extruded by the piston driven by a hydraulic driver and compacted, transported and heated constantly; when the surface temperature of the plastic powder reaches the melt temperature of Tf plus or minus 20 DGE C, the power is extruded from a machine head and a die. Then, extruding matters are cooled and set by a cooling-traction device and the products are finished. By regulating the particle size of the powder, addictive and forming process conditions and so on, the invention can control opening rate, size and distribution of the aperture; the invention has simple process, short production cycle, low forming temperature and pressure as well as short forming time; besides, the invention can greatly reduce the production cost can not be degraded easily when the plastic is processed and can be widely applicable to molding of the opening micropore products of thermoplastic powders, thermosetting power and so on.

Description

technical field [0001] The invention belongs to the technical field of preparation of perforated microporous plastic products, and in particular relates to a method for preparing perforated microporous plastic profiles by semi-melt extrusion molding. Background technique [0002] Open-cell microporous plastic products refer to plastic products that have countless micropores with a pore size of 0.01-50um, and the pores are connected to each other. Open-cell microporous plastic profiles include filter pipes and plates, heat and sound insulation profiles (including sheets, plates, hollow profiled plates, rods, pipes, belts), composite shock-absorbing sheets and profiles, lightweight composite Wall panels, etc., are widely used in water treatment, gas filtration, solid-liquid separation, biomedical engineering, construction, transportation and other fields. [0003] At present, the methods for preparing open-cell microporous plastic profiles mainly include: molten plastic extru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/54B29C47/92B29B13/02B29B13/00C08L83/04C08K5/43C08K5/20C08K5/23C08K5/09B29C48/92
CPCB29C47/92B29C48/92B29C2948/92704B29C2948/92895
Inventor 吴智华陶剑贺湘伟
Owner SICHUAN UNIV
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