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Co-extrusion preparation method of polymer functionally gradient materials (FGM) and products

A technology of gradient functional materials and polymers, applied in the field of polymer material processing, to achieve the effect of simple process and easy control

Inactive Publication Date: 2010-01-06
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to realize gradient control of material composition and function in the usual polymer co-extrusion molding process. Gradient control of product composition, thus providing a simple gradient control, low production energy consumption, single and convenient production process (single project, One process), continuous extrusion of profiles and complex shape products, continuous and efficient production process, and industrialization Co-extrusion preparation method of implemented polymer gradient functional materials and products

Method used

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  • Co-extrusion preparation method of polymer functionally gradient materials (FGM) and products
  • Co-extrusion preparation method of polymer functionally gradient materials (FGM) and products
  • Co-extrusion preparation method of polymer functionally gradient materials (FGM) and products

Examples

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Effect test

Embodiment 1

[0026] Embodiment 1: High-density polyethylene (HDPE) and polyoxyethylene (PEO) are weighed respectively by the mass percentage of 75:25, add the feeding device of SHJ-20B twin-screw extruder after fully mixing by mixing machine, extrude The temperature of the discharge barrel is set and controlled at 110-185°C from the solid conveying section to the melt conveying section (exit) [the outlet temperature is set according to (T 2 +T 1 ) / 2 setting]; the shaping mold is a fishtail sheet mold designed and manufactured by the inventor, and the mold is composed of an upper and lower mold body and is insulated with a heat insulating material, wherein the temperature T of the upper mold body 1 Set and control at 160°C, while the temperature of the lower die body T 2 Set and control at 210°C, the ΔT=T formed in the cavity of the extrusion mold 2 -T 1 = 50°C temperature gradient field; the extruder extrudes a 0.5mm thick molten sheet at a speed of 300mm / min, and then passes through a ...

Embodiment 2

[0027] Embodiment 2: Weigh polymethyl methacrylate (PMMA), polyoxyethylene (PEO) and functional additive carbon black (CB) respectively by the mass percentage of 55: 45: 1.5, add after fully mixing by mixing machine The feeding device of the IMC-1663 single-screw extruder, the temperature of the barrel of the extruder is set and controlled at 110-205°C from the solid conveying section to the melt conveying section (exit); the upper and lower mold bodies of the shaping mold are insulated The material is insulated, where the temperature of the upper die body T 2 Set and control at 230°C, while the temperature of the lower die body T 1 Set and control at 180°C to form ΔT=T in the extrusion mold cavity 2 -T 1 =50°C temperature gradient field; the extruder extrudes a 1mm thick molten sheet at a speed of 300mm / min, and passes through a ΔT'=60°C established and controlled by a far-infrared heater and a high-temperature air blowing device After the temperature gradient field, it is...

Embodiment 3

[0028] Example 3: Weigh high-density polyethylene (HDPE) and polyphenylene sulfide (PPS) at a mass percentage of 70:30, and add them to the feeding device of SHJ-20B twin-screw extruder after being fully mixed by a mixing machine , the barrel temperature of the extruder is set and controlled at 130-300°C from the solid conveying section to the melt conveying section (outlet); The mold body is constructed and insulated with heat insulating material, wherein the temperature T of the upper mold body 1 Set and control at 280°C, while the temperature of the lower die body T 2 Set and control at 320°C, the ΔT=T formed in the extrusion mold cavity 2 -T 1 =40°C temperature gradient field; the extruder extrudes a 0.5mm thick molten sheet at a speed of 300mm / min, and then passes through a temperature gradient field greater than the mold cavity ΔT'=50°C, and then cools in the shaping device Shaped into a gradient functional sheet; this specific temperature gradient field is establishe...

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Abstract

The invention discloses a co-extrusion preparation method of polymer functionally gradient materials (FGM) and products, which comprises the following steps: (1) preparing two or more kinds of polymers according to the certain mass percent, mechanically mixing the prepared raw materials, and then, adding the mixture into a screw extruder; (2) at the shaping phase of the co-extrusion process of the mixture, setting a certain temperature gradient field (delta T) for the blending melt which flows in a shaping mold; (3) enabling the shaped molding object which is extruded out of the shaping mold and is in the melting state to pass through a same or different certain temperature gradient field (delta T'); and (4) leading the molding object into a forming mold quickly by a traction device, and cooling the molding object below the melting point within a very short time. The invention has the advantage of providing a method capable of industrialized implementation for preparing polymers or polymer functionally gradient materials (FGM) and products by using traditional equipment and technology for processing polymers.

Description

(1) Technical field [0001] The present invention relates to a polymer mixture or a polymer and a functional additive mixture gradient functional material and a preparation method for its product, in particular to a polymer or polymer-based gradient functional material and product capable of continuous and rapid blending extrusion Preparation. It belongs to the technical field of polymer material processing. (2) Background technology [0002] Functional Graded Materials (FGM) is a new concept in the field of materials science. It is firstly used as a thermal stress relaxation material with high heat insulation for the body and engine of the space shuttle. It was developed by Japanese scientists in Introduced in the late 1980s. It is to solve the bad effect that the laminated material will peel off and fall off at the interface due to the huge thermal stress at the joint surface (interface) caused by the difference in the linear expansion coefficient. FGM is a heterogeneous...

Claims

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Application Information

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IPC IPC(8): B29C47/00B29C47/92B29C47/12B29C47/78B29C48/30B29C48/875B29C48/92
CPCB29C48/875B29C48/865
Inventor 戴亚辉阎新萍戴嘉懿
Owner HENAN POLYTECHNIC UNIV
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