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Micro-foaming and light-reflecting PC film material and preparation method thereof

A light reflection and micro-foaming technology, which is applied in the field of polymer compound materials, can solve the problems of poor dispersion uniformity of light reflection particles, high price of chemical foaming agents, and increased film cost, and achieve low cost, low production cost, and high-quality products. The effect of stable performance

Inactive Publication Date: 2016-01-06
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The blending method has a simple process and low equipment requirements, but the disadvantage is that a large amount of light-reflecting particles must be added to make the film have high reflectivity, and the dispersion uniformity of the light-reflecting particles is poor
In the microfoam method, the stretching pore-forming method is mainly used for stretchable crystalline polymers, such as PP, PET, and it is difficult to stretch into holes for the rigid non-crystalline polymer PC; adding chemical foaming Although the agent method has a simple process, after the chemical blowing agent is decomposed, some undecomposed residues remain in the film substrate, which affects the performance of the film, and the price of the chemical blowing agent is relatively high, and the cost of the film increases; in these methods , the method of adding gas foaming agent is relatively cheap, less environmental pollution, good mechanical properties of the film, is a better method for preparing PC light reflective film

Method used

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  • Micro-foaming and light-reflecting PC film material and preparation method thereof
  • Micro-foaming and light-reflecting PC film material and preparation method thereof
  • Micro-foaming and light-reflecting PC film material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Put PS into an autoclave, pass in propane, impregnate at 0.3Mpa for 2 hours, and prepare pre-expanded PS particles;

[0030] (2) 10% of the pre-expanded PS granules prepared in the above step (1) and 90% of PC are mixed uniformly with a high mixer and then put into the feeding port of the twin-screw extruder, extruded and granulated, and the pellets After drying at 120° C. for 4 hours, a micro-foaming light-reflecting PC film material was prepared. Table 1 shows the light reflectance test results of the 250 μm thick PC film prepared with it.

Embodiment 2

[0032] (1) Put PP into the autoclave, pass in propane, impregnate at 0.3Mpa for 2 hours, and prepare pre-expanded PP particles;

[0033] (2) 10% of the pre-expanded PP particles prepared in the above step (1) and 90% of PC are mixed evenly with a high mixer and then put into the feeding port of the twin-screw extruder, extruded and granulated, and the pellets After drying at 120° C. for 4 hours, a micro-foaming light-reflecting PC film material was prepared. Table 1 shows the light reflectance test results of the 250 μm thick PC film prepared with it.

Embodiment 3

[0035] (1) PMMA is dropped into the autoclave, feeds propane, impregnates 2h under 0.3Mpa, prepares the pre-expanded PMMA particle;

[0036] (2) 10% of the pre-expanded PMMA particles prepared by the above steps (1) and 90% PC are mixed uniformly with a high mixer and then dropped into the feeding port of the twin-screw extruder, extruded, granulated, and the pellets After drying at 120° C. for 4 hours, a micro-foaming light-reflecting PC film material was prepared. Table 1 shows the light reflectance test results of the 250 μm thick PC film prepared with it.

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Abstract

The invention discloses a micro-foaming and light-reflecting PC film material and a preparation method thereof. The preparation method of the micro-foaming and light-reflecting PC film material comprises the following steps: (1) preparing pre-foamed thermoplastic resin particles: putting the thermoplastic resin particles into a high-pressure kettle containing a gas foaming agent and impregnating for 1-3.5 hours under the pressure of 0.20-0.45MPa to obtain the pre-foamed thermoplastic resin particles; (2) preparing the micro-foaming and light-reflecting PC film material by uniformly mixing the pre-foamed thermoplastic resin particles prepared by the step (1) with PC resin through a high-speed mixer, extruding the particles through a twin-screw extruder, and prilling, wherein the temperature of a homogenizing section of the extruder is 275-290 DEG C, the temperature of a die head is 265-280 DEG C, and the rotation rate of screws is 100-500rpm; cooling and drying the particles to obtain the micro-foaming and light-reflecting PC film material. The micro-foaming and light-reflecting PC film material has the advantages of high visible light reflection rate, light weight, low cost, simple preparation process and simple equipment.

Description

technical field [0001] The invention relates to a micro-foaming light-reflecting PC film material and a preparation method thereof, belonging to the field of polymer compound materials. Background technique [0002] The light reflective film is an important part of the backlight module of the liquid crystal display, and its function is to efficiently reflect the light leaking out of the light guide plate to the light emitting direction, and provide brightness for the liquid crystal. According to the technical requirements of the backlight module, the light reflective film should have special properties such as high light reflectivity, high heat resistance, high stiffness, and aging resistance. [0003] PC (polycarbonate) resin has the characteristics of high heat resistance, high stiffness, good weather resistance, stable size, etc., and has been used to prepare the base material of light reflective film. Compared with PET and PP substrates currently used in light reflectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L33/12C08L23/12C08L23/08C08L23/06C08L25/06C08L23/20C08L67/02C08J9/228C08J9/18
Inventor 刘建马寒冰
Owner SOUTHWEAT UNIV OF SCI & TECH
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