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High-reflectivity polypropylene film and preparation method thereof

A technology of polypropylene film and high reflectivity, which is applied in the field of polypropylene film and its preparation, can solve the problems of uniform dispersion of uniformly plasticized active ingredients, difficulty in powder dispersion, difficulty in making films, etc., to achieve reflectivity improvement, The effect of increasing the overall reflectivity and reducing the thickness

Active Publication Date: 2016-04-20
四川东方绝缘材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an effective method to improve the efficiency of the reflective film, one is to increase the thickness of the film and increase the content of active ingredients, but it is difficult to uniformly plasticize and evenly disperse the active ingredients in the production process, and it is extremely difficult to stably salivate a film with a thickness of 100 μm or less , and the 100μm reflectivity can reach up to 92% to 93%; the other is to form foamed micropores in the film to improve the film gap, which usually requires biaxial stretching to prepare thinner PP films (processing temperature is above the melting point of polypropylene) , melt the polypropylene, and make the film uniformly thinner by biaxial stretching during the cooling process of the polypropylene film), because the film thickness is thin, the powder is difficult to disperse, and the foaming rate of PP is lower than that of PET, so the high reflectivity film difficult to obtain
However, after cooling and forming, the polypropylene film is cold stretched to improve the reflectivity and has not been reported in the literature.

Method used

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  • High-reflectivity polypropylene film and preparation method thereof
  • High-reflectivity polypropylene film and preparation method thereof
  • High-reflectivity polypropylene film and preparation method thereof

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Embodiment 1～8

[0023] A preparation method of a high-reflectivity polypropylene film, the basic process is:

[0024] Polypropylene resin: inorganic filler = 99-80: 1-20 mass ratio of mixed ingredients, through a twin-screw extruder at 180-210 ° C (temperature A) blending extrusion granulation to make intermediate material for later use; The intermediate material is melted in the temperature range of 180-210°C (temperature B) by a single-screw extruder, extruded through a die head with a temperature of 190-200°C (temperature C), and passed through the roller temperature ( The temperature D) is 20-30°C for the upper roll, 80-100°C for the middle roll, and 100-120°C for the lower roll. The three diameters are 450mm and the speed is 2-25r / min. It is a polypropylene base film of 100-500 μm. After the polypropylene base film is cooled to 25°C (temperature E), it is then stretched longitudinally at a stretch ratio of 2 to 4 times at 25°C-80°C (temperature F). Longitudinal cold drawing), that is, a...

Embodiment 9

[0033] A high reflectivity polypropylene film, the high reflectivity polypropylene film is a film material composed of polypropylene resin and inorganic filler, the mass ratio of the polypropylene resin and the inorganic filler in the film material is 99: 1;

[0034]The high-reflectivity polypropylene film is obtained by blending, extruding, and granulating a mixture of raw materials with a mass ratio of polypropylene resin: inorganic filler = 99:1 through a twin-screw extruder at a temperature of 180°C to make an intermediate material; The intermediate material is melted at a temperature of 180°C by a single-screw extruder, extruded through a die head with a temperature of 190°C, and passed through an upper roll with a temperature of 20°C, a middle roll with a temperature of 80°C, and a lower roll with a temperature of 100°C. The polypropylene base film with a thickness of 100 μm is salivated on three rollers with a diameter of 450 mm and a rotation speed of 2 to 25 r / min. Af...

Embodiment 10

[0036] A high reflectivity polypropylene film, the high reflectivity polypropylene film is a film material composed of polypropylene resin and inorganic filler, the mass ratio of the polypropylene resin and the inorganic filler in the film material is 80: 20;

[0037] The high-reflectivity polypropylene film is obtained by blending, extruding, and granulating a mixture of raw materials with a mass ratio of polypropylene resin: inorganic filler = 80:20 by a twin-screw extruder at a temperature of 210°C to make an intermediate material; The intermediate material is melted at a temperature of 210°C by a single-screw extruder, extruded through a die head with a temperature of 200°C, and passed through an upper roll at a temperature of 30°C, a middle roll at 100°C, and a lower roll at 120°C in sequence by drooling. The polypropylene base film with a thickness of 500 μm is salivated on three rollers with a diameter of 450 mm and a rotation speed of 2 to 25 r / min. After the polypropy...

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Abstract

The invention relates to a high-reflectivity polypropylene film. The high-reflectivity polypropylene film is characterized in that the high-reflectivity polypropylene film is a film material consisting of polypropylene resin and inorganic filler in the mass ratio being (80-99): (1-20). According to the preparation method, a mixed material of the polypropylene resin and the inorganic filler is subjected to blended extrusion pelletization through a double-screw extruder, melted through a single-screw extruder and extruded by a die head at the temperature of 190-200 DEG C, a polypropylene base film with the thickness being 100-500 mu m is formed through flow casting on three rollers at the same speed with a flow casting method, cooled to the temperature of 25 DEG C and longitudinally stretched in a stretching ratio being 2-4 times at the temperature of 25-80 DEG C, and the polypropylene film is prepared. The polypropylene film has the density being 0.5-0.7 g / cm<3>, is 50-250 mu m thick, has the light reflectivity being 85%-97% at the wave bands from 440 nm to 740 nm and can serve as a high-reflectivity film to be used in illumination and other fields.

Description

technical field [0001] The invention belongs to polypropylene film and its preparation, and relates to a high-reflection polypropylene film and its preparation method. The high-reflectivity polypropylene film of the invention is suitable as a light-reflecting film and is used in fields such as lighting. Background technique [0002] Polypropylene (referred to as PP) reflective film is a film with good insulation, softness and reflective properties, which is mainly used in the field of lighting. Currently commercially available polypropylene (PP) reflective films have a thickness of 100-1000 μm and a reflectivity ranging from 75% to 90%. Generally, polypropylene (PP) reflective films increase their reflectivity by adding powder, and their reflectivity is not high. . Thin films with high reflectivity and small thickness are more difficult to achieve. As an effective method to improve the efficiency of the reflective film, one is to increase the thickness of the film and inc...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08K3/22C08K3/30
CPCC08J5/18C08J2323/12C08K3/22C08K3/30C08K2003/2237C08K2003/3045C08L23/12
Inventor 何航马雅琳赵贵红梁倩倩
Owner 四川东方绝缘材料股份有限公司
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