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Modified polypropylene membrane, and preparation method thereof

A polypropylene film and polypropylene resin technology, applied in the field of modified polypropylene film and its preparation, can solve the problems of poor mechanical properties and water vapor barrier properties of the modified polypropylene film, and achieve improved mechanical strength, improved barrier properties, The effect of reducing the number and length of cracks

Inactive Publication Date: 2018-01-16
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a modified polypropylene film and its preparation method to solve the problem of poor mechanical properties and water vapor barrier properties of the existing modified polypropylene film

Method used

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  • Modified polypropylene membrane, and preparation method thereof
  • Modified polypropylene membrane, and preparation method thereof
  • Modified polypropylene membrane, and preparation method thereof

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preparation example Construction

[0025] As described in the background art, the existing polypropylene film has problems of poor mechanical properties and water vapor barrier properties. In order to solve the above technical problems, the application provides a method for preparing a modified polypropylene film, the preparation method comprising: carrying out a first polymerization reaction of vinyl acetate, allyl glycidyl ether and an initiator to obtain vinyl acetate - allyl glycidyl ether copolymer; use at least part of vinyl acetate-allyl glycidyl ether copolymer to modify silica to obtain a silica modifier; and mix the first polypropylene resin with After the silicon dioxide modifier is sequentially melt-blended and biaxially stretched, a modified polypropylene film is obtained.

[0026] Both polyvinyl acetate segment and allyl glycidyl ether contain polar groups, so both have good compatibility with nano-silica. The copolymer of allyl glycidyl ether and polyvinyl acetate is used to wrap and modify nano...

Embodiment 1

[0056] Preparation of silica modifier:

[0057] Add 10 parts of AGE monomer, 200 parts of vinyl acetate monomer, and 180 parts of ethyl acetate solvent into a four-necked bottle equipped with electric stirring, condenser, and thermometer, and pass nitrogen gas for 30 minutes to remove the oxygen in the four-necked bottle. The temperature of the system was raised to 60°C, and then the ethyl acetate solution containing 0.1 part of benzoyl peroxide (containing 20 parts of ethyl acetate) was added dropwise. After 20 minutes, the dropwise addition was completed, and the temperature was raised to 70°C. Add 5 parts of distilled water into the reaction system, and then dropwise add 208 parts of ethyl orthosilicate, after 60 minutes, the dropwise addition is completed, and the temperature is kept for 3 hours to obtain the reaction product. The reaction product was vacuum-dried at 50°C to obtain a modifier (vinyl acetate-allyl glycidyl ether copolymer), wherein in the modifier, the weig...

Embodiment 2

[0062] The difference with embodiment 1 is: change the consumption of modifying agent. Specifically: 2 parts of modifying agent, 10 parts of compatibilizer and 88 parts of F280 polypropylene resin (the first polypropylene resin) are melt blended at 210-230 °C, granulated and dried to obtain modified polypropylene resin Raw materials: using an industrial biaxial stretching device, under the conditions of a longitudinal stretch ratio of 5 and a transverse stretch ratio of 10, a modified polypropylene film was obtained at a die temperature of 230° C., and the film thickness was 18 μm. The content of nano silicon dioxide in the film is 0.4wt%.

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Abstract

The invention provides a modified polypropylene membrane, and a preparation method thereof. The preparation method comprises following steps: vinyl acetate, allyl glycidyl ether, and an initiator aresubjected to primary polymerization so as to obtain a vinyl acetate-allyl glycidyl ether copolymer; at least a part of the vinyl acetate-allyl glycidyl ether copolymer is used for modification of silicon dioxide so as to obtain a silicon dioxide modifying agent; a first polypropylene resin and the silicon dioxide modifying agent are subjected to melt blending and bidirectional stretching treatmentsuccessively so as to obtain the modified polypropylene membrane. According to the preparation method, polypropylene is injected among net-shaped fiber bundles, on one hand, it is beneficial for improving of the mechanical strength of the modified polypropylene membrane, and reducing the number and the length of cracks on the surface of the modified polypropylene membrane, and on the other hand,it is beneficial for formation of a compact structure of the surface of the modified polypropylene membrane, the compact structure is beneficial for reducing of diffusion rate of organic solvents, oxygen, and water vapor from the outside into the modified polypropylene membrane, and is beneficial for improving of the barrier properties of the modified polypropylene membrane.

Description

technical field [0001] The invention relates to organic synthesis, in particular to a modified polypropylene film and a preparation method thereof. Background technique [0002] Polypropylene film is one of the most important packaging substrates, which has good printing performance and heat sealing performance. As a packaging material, the main defects of polypropylene film are the high solubility of organic solvents in the film, large diffusion coefficient, and poor dimensional stability. These defects are closely related to the microstructure of polypropylene film. For this reason, the present invention proposes a polypropylene film design scheme with a special microstructure to improve the mechanical properties and food safety of the film. Contents of the invention [0003] The main purpose of the present invention is to provide a modified polypropylene film and a preparation method thereof, so as to solve the problem of poor mechanical properties and water vapor barr...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L51/06C08K9/10C08K3/36C08F218/08C08F216/14C08F255/02C08F2/46
Inventor 李东立许文才付亚波廖瑞娟石佳子王纪刚王雅珺何晓辉
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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