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Micro-foaming reflective film and preparation method thereof

A reflective film and micro-foaming technology, which is applied in the field of preparation of micro-foaming materials, can solve the problems of low diffuse reflectivity, high specular reflectivity, and unsuitable LED display reflective film.

Inactive Publication Date: 2013-03-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the reflective film prepared in China is mainly a non-foaming film doped with calcium carbonate and titanium dioxide powder. The specular reflectance is too high and the diffuse reflectance is low, so it is not suitable for the reflective film of LED display.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Foaming material premixing: dissolve 0.03 parts of maleic anhydride and 0.01 parts of dibenzoyl peroxide with ether to obtain premix a, mix 100 parts of polypropylene with premix a, and wait for the ether to volatilize Obtain premix b; weigh 0.2 part of azodicarbonamide, 0.3 part of sodium bicarbonate and 0.1 part of trisodium citrate powder, and mix the three evenly to configure a composite blowing agent; premix b and composite blowing agent Place it in a mixer and stir at a low speed, take it out after 15 minutes to obtain premix c, and the said parts are all counted in parts by mass;

[0038] (2) Extrusion and granulation of foamed material: put the premix c obtained in (1) into the feeding port of the twin-screw extruder, the barrel temperature is 165-180°C, the die head temperature is 175-180°C, the screw speed 10 to 100 rpm, twin-screw length-to-diameter ratio of 45:1, granulated with a granulator after extrusion;

[0039] (3) Foaming extrusion of pellets: Pu...

Embodiment 2

[0042] (1) Foaming material premixing: dissolve 0.04 parts of maleic anhydride and 0.02 parts of dibenzoyl peroxide with ether to obtain premix a, mix 100 parts of polypropylene with premix a, and wait for the ether to volatilize Obtain premix b; weigh 0.2 parts of azodicarbonamide, 0.4 parts of sodium bicarbonate and 0.2 parts of trisodium citrate powder, and mix the three evenly to configure a composite blowing agent; premix b and composite blowing agent Place it in a mixer and stir at a low speed, take it out after 15 minutes to obtain premix c, and the said parts are all counted in parts by mass;

[0043] (2) Extrusion and granulation of foamed material: put the premix c obtained in (1) into the feeding port of the twin-screw extruder, the barrel temperature is 165-180°C, the die head temperature is 175-180°C, the screw speed 10 to 100 rpm, twin-screw length-to-diameter ratio of 45:1, granulated with a granulator after extrusion;

[0044] (3) Foaming extrusion of pellets:...

Embodiment 3

[0047] (1) Foaming material premixing: dissolve 0.05 parts of maleic anhydride and 0.02 parts of dibenzoyl peroxide with ether to obtain premix a, mix 100 parts of polypropylene with premix a, and wait for the ether to volatilize Obtain premix b; weigh 0.3 part of azodicarbonamide, 0.3 part of sodium bicarbonate and 0.2 part of trisodium citrate powder, and mix the three evenly to configure a composite blowing agent; premix b and composite blowing agent Place it in a mixer and stir at a low speed, take it out after 15 minutes to obtain premix c, and the said parts are all counted in parts by mass;

[0048] (2) Extrusion and granulation of foamed material: put the premix c obtained in (1) into the feeding port of the twin-screw extruder, the barrel temperature is 165-180°C, the die head temperature is 175-180°C, the screw speed 10 to 100 rpm, twin-screw length-to-diameter ratio of 45:1, granulated with a granulator after extrusion;

[0049] (3) Foaming extrusion of pellets: Pu...

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Abstract

The invention relates to a micro-foaming reflective film and a preparation method thereof, and especially relates to a micro-foaming technology based reflective film for panel display. Specifically, the invention includes a polypropylene micro-foaming reflective film and a preparation method thereof. The micro-foaming reflective film of the present invention is a polypropylene white opaque film with a thickness of 0.5-1mm, a cell diameter of 5-50[mu]m and a cell density of 109-1011 cells / cm<3>. The preparation method of the micro-foaming reflective film provided by the present invention employs polypropylene (PP), maleic anhydride and a composite foaming agent as main raw materials, and slight amount of dibenzoyl peroxide as an initiator. Mixture of the four are first crosslinked and granulated in a twin-screw extruder, and at last extruded from a single-screw extruder for curtain coating and film build. According to invention, PP are modified and mixed with a foaming agent in a same step, so as to facilitate disperse of the foaming agent, obtain a finished product with uniformly distributed bubbles, simplify the preparation technology, and save energy at the same time.

Description

technical field [0001] The invention belongs to the field of preparation of micro-foaming materials, and relates to a micro-foaming reflective film and a preparation method thereof, in particular to a reflective film and a preparation method of a flat-panel display based on micro-foaming technology, specifically, a micro-foaming reflective film and a preparation method thereof A polypropylene microfoaming film and a preparation method thereof. Background technique [0002] Micro-foaming molding technology refers to the use of thermoplastic materials as the matrix, through special processing technology, so that the middle layer of the product is densely covered with closed micro-pores with a cell size ranging from one micron to tens of microns. At present, domestic research on microporous plastics mainly focuses on the improvement of the mechanical properties of microporous plastics. There are few studies on its optical properties. [0003] In fact, in foreign countries, in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08F255/02C08J9/10C08J9/08B29D7/01B29C47/92B29B9/06B29C44/00B29C48/92
CPCB29C48/04B29C48/397B29C48/40
Inventor 施镇江邱玮杨胜林金俊弘李光
Owner DONGHUA UNIV