Preparation method of polypropylene foaming sheet material through ultraviolet light radiation crosslinking

A technology of cross-linked polypropylene and foamed sheet, which is applied in the field of preparation of polypropylene foamed sheet and ultraviolet cross-linked polypropylene foamed sheet, can solve the problem of reducing the usability and mechanical properties of materials and failing to prepare foamed sheets. materials, difficult continuous production and other problems, to achieve the effect of low density, low price, good mechanical and thermal properties

Inactive Publication Date: 2014-10-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, ordinary grades of polypropylene are semi-crystalline polymers, which soften significantly after reaching the melting temperature, have low melt strength, and cannot prepare qualified foaming materials.
[0004] At present, the existing irradiation technology mostly uses high-energy ray irradiation, such as X-rays and γ-rays, etc., but the ene

Method used

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  • Preparation method of polypropylene foaming sheet material through ultraviolet light radiation crosslinking

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Example Embodiment

[0026] Example 1: Weigh 100 parts of polypropylene, 0.2 parts of ultraviolet photoinitiator, 1.6 parts of sensitizer, 10 parts of toughening agent and 0.1 part of antioxidant by mass parts, and mix for 10 to 15 minutes in a high-speed mixer , The material temperature is controlled at about 80℃. Then, the uniformly mixed materials are blended and extruded by a twin-screw extruder, and pelletized. The extrusion temperature is about 230°C. Weigh 30 parts of foaming agent masterbatch and mix uniformly with the pellets pelletized by the twin-screw extruder, and perform non-foaming extrusion on the single-screw extruder to extrude a polypropylene foam sheet with a thickness of 1mm. The outlet temperature is 160°C. The polypropylene foamed sheet is subjected to 1000mj / cm in a UV box 2 UV radiation. The ultraviolet irradiated sheet was subjected to a foaming experiment in a foaming furnace, and the foaming temperature was 220°C.

Example Embodiment

[0027] Example 2: Weigh 100 parts of polypropylene, 0.2 parts of ultraviolet photoinitiator, 1.6 parts of sensitizer, 10 parts of toughening agent and 0.1 part of antioxidant by mass parts, and mix them in a high-speed mixer for 10 to 15 minutes , The material temperature is controlled at about 80℃. Then, the uniformly mixed materials are blended and extruded by a twin-screw extruder, and pelletized. The extrusion temperature is about 230°C. Weigh 30 parts of foaming agent masterbatch and mix uniformly with the pellets pelletized by the twin-screw extruder, and perform non-foaming extrusion on the single-screw extruder to extrude a polypropylene foam sheet with a thickness of 1mm. The outlet temperature is 160°C. Put the polypropylene foam sheet in a UV box for 3000mj / cm 2 UV radiation. The UV-irradiated sheet was subjected to a foaming experiment in a foaming furnace, and the foaming temperature was 220°C.

Example Embodiment

[0028] Example 3: Weigh 100 parts of polypropylene, 0.2 parts of ultraviolet photoinitiator, 1.6 parts of sensitizer, 10 parts of toughening agent and 0.1 part of antioxidant by mass parts, and mix them in a high-speed mixer for 10 to 15 minutes , The material temperature is controlled at about 80℃. Then the uniformly mixed materials are blended and extruded by a twin-screw extruder, and pelletized. The extrusion temperature is about 230°C. Weigh 30 parts of foaming agent masterbatch and mix uniformly with the pellets pelletized by the twin-screw extruder, and perform non-foaming extrusion on a single-screw extruder to extrude a polypropylene foam sheet with a thickness of 1mm. The outlet temperature is 160°C. Put the polypropylene foam sheet in a UV box for 5000mj / cm 2 UV radiation. The ultraviolet irradiated sheet was subjected to a foaming experiment in a foaming furnace, and the foaming temperature was 220°C.

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Abstract

The invention relates to a polypropylene foaming sheet material preparation method utilizing an ultraviolet light radiation crosslinking technology. The method adopts ultraviolet light radiation to trigger polypropylene grafting and crosslinking so as to improve the melt strength of polypropylene, and can be applied to the development and production of a polypropylene sheet material with a high foaming ratio. The preparation method is characterized in that a special polypropylene foaming sheet material can be produced through an excellent blending technology and an energy-saving, controllable, and continuous ultraviolet light radiation technology, the obtained foaming material after a conventional chemical foaming technology has a uniform pore size, and the foaming ratio can reach 10 to 30 times. Furthermore, the energy consumption is low, the emission is zero, and the operation is simple during the production process; large-scale continuous production can be achieved, the technology controllability is high, and the product quality is stable.

Description

1. Technical field [0001] The invention relates to a polypropylene foam sheet, in particular to a preparation method of an ultraviolet cross-linked polypropylene foam sheet, and belongs to the field of polymer modification and processing. 2. Background technology [0002] Polypropylene foam material has excellent comprehensive performance and high cost performance: higher heat resistance and tensile strength than polyethylene foam material, higher impact strength than polystyrene foam material, and higher impact strength than polyurethane foam material Its environmental protection is gradually becoming the new darling of cushioning, packaging, interior decoration, catering and other industries. [0003] However, ordinary grades of polypropylene are semi-crystalline polymers, which soften significantly after reaching the melting temperature, have low melt strength, and cannot prepare qualified foaming materials. [0004] At present, the existing irradiation technology mostly...

Claims

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Application Information

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IPC IPC(8): B29C35/08C08L23/14C08J9/04
Inventor 苑会林王亮
Owner BEIJING UNIV OF CHEM TECH
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