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High performance polypropylene film and preparation method thereof

A technology of polypropylene film and polypropylene, applied in chemical instruments and methods, types of packaging items, special packaging items, etc., can solve the problem that polypropylene film is difficult to meet multiple performance requirements at the same time

Active Publication Date: 2016-05-04
GETTEL GRP TONGCHENG PLASTIC IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a high-performance polypropylene film and its preparation method to solve the problem that the polypropylene film in the prior art is difficult to meet multiple performance requirements at the same time

Method used

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  • High performance polypropylene film and preparation method thereof
  • High performance polypropylene film and preparation method thereof
  • High performance polypropylene film and preparation method thereof

Examples

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preparation example Construction

[0038] According to another aspect of the present invention, there is also provided a method for preparing the above-mentioned high-performance polypropylene film, which includes the following steps: combining the nano-silica composition with the first polypropylene, the second polypropylene and the third polypropylene respectively. Propylene is melt-blended to obtain the first modified polypropylene, the second modified polypropylene and the third modified polypropylene respectively; the first modified polypropylene, the second modified polypropylene and the third modified polypropylene Perform three-layer co-extrusion biaxial stretching to form a high-performance polypropylene film.

[0039] In the above preparation method provided by the present invention, the nano-silica composition is melt-blended with the first polypropylene, the second polypropylene and the third polypropylene respectively, and then three-layer co-extrusion biaxial stretching is used to form a film, A p...

Embodiment 1

[0060] Referring to the methods proposed in patents CN101724176, CN102020796 and CN103189441, a nano-silica composition is prepared, wherein the nano-silica particles account for 54% of the total mass of the composition, and the specific operation steps are as follows:

[0061] Add 10Kg of EVA emulsion with a solid content of 50% in a reactor with a capacity of 50 liters of stirring, dropping funnel, and thermometer. Set the stirring speed at 100 rpm and the temperature at 50 degrees, add powdered polyethylene oxide resin 50g and polylactic acid 50g. After stirring for 30 minutes, add 25Kg of water glass solution with silicon dioxide content of 24%, stir for 30 minutes, add 40% sulfuric acid dropwise until PH=5.5, then heat up to 70 degrees, add 40% sulfuric acid dropwise until PH=7.0, Continue to stir for 30 minutes, then wash to remove sulfate ions, press filter, dry, and pulverize to prepare a nano-silica composition.

[0062] Melt-blending 1.0Kg of nano-silica composition...

Embodiment 2

[0065] Other conditions are the same as in Example 1, changing the content of the nano silicon dioxide composition. 2.6Kg of nano-silica composition and 97.4Kg of F280 polypropylene resin were melt-blended, granulated and dried to obtain the upper resin raw material;

[0066] The upper layer resin is added to the three extruders of the three-layer co-extrusion biaxial stretching equipment, the temperature of the three extrusion screws is set to 230 °C, the transverse stretch ratio is 9, and the longitudinal stretch ratio is 4. The rotating speed is 48rpm, the pressure is 45bar, and the die temperature is 230°C. A single-structure polypropylene film (same composition and structure as the upper film) with a thickness of 18 μm was obtained.

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Abstract

The invention provides a high performance polypropylene film and a preparation method thereof. The film comprises a top film, a core film and a lower film. The top film includes 2.0-3.0% of a nano-silica composition and 97.0-98.0% of first polypropylene, the core film includes 0.5-2.0% of a nano-silica composition and 99.5-98.0% of second polypropylene, and the lower film includes 3.5-5.0% of a nano-silica composition and 96.5-95% of third polypropylene, wherein the nano-silica composition includes 50-55% of nano-silica particles and 45-50% a resin modifier. Each layer of the film contains a specific content of nano-silica composition, so that the film has high modulus and elongation at break, low diffusion coefficient and solubility parameter to solvent small molecules, low dynamic friction coefficient, and has good comprehensive properties, thus being suitable for flexible packaging materials.

Description

technical field [0001] The invention relates to the technical field of polypropylene films, in particular to a high-performance polypropylene film and a preparation method thereof. Background technique [0002] Polypropylene film is one of the most important packaging films, and it is usually required to have good printing performance and heat sealing performance. However, as a printing substrate, one of the biggest disadvantages of polypropylene film is the higher residual solvent after printing than other types of films such as polyethylene terephthalate (PET) film. For this reason, the color printing factory can only reduce the solvent residue of the polypropylene film by reducing the line speed, increasing the temperature of the drying tunnel, and increasing the curing time. In addition, it is also reported that a special printing ink is used, and the solvent molecules can be volatilized to the maximum extent through the evacuated ink crust to reduce the solvent residue...

Claims

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Application Information

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IPC IPC(8): B32B27/32B32B27/18B29C69/00B29C47/92B29C55/12B29K23/00B29C48/92
CPCB29C48/0018B29C48/08B29C2948/92514B29C2948/9259B29C2948/92704B29C2948/92904B29K2023/12B32B27/18B32B27/32B32B2250/03B32B2250/242B32B2307/558B32B2439/70
Inventor 许文才李东立尤圣隆刘枝付亚波石佳子廖瑞娟王雅珺何晓辉
Owner GETTEL GRP TONGCHENG PLASTIC IND
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