Preparation method of polymer micro-foaming film

A polymer film and polymer technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of residual solubles and chemical solvents, large environmental and product pollution, and uneven pore size distribution. Equal problem, to achieve the effect of increased pore density, shortened saturation time, and increased nucleation speed

Active Publication Date: 2015-10-21
青岛中诚高分子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal shrinkage orientation method is suitable for easily crystallized materials, the process is complex and the control precision is high, the film pore structure is anisotropic, and the pore size distribution is uneven
The soluble matter extraction method needs to use a large amount of solvent to elute the soluble matter in the film. The prepared film has an open-pore structure, and there are residual soluble matter and chemical solvents in the film, which will cause great pollution to the environment and products.

Method used

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  • Preparation method of polymer micro-foaming film
  • Preparation method of polymer micro-foaming film
  • Preparation method of polymer micro-foaming film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First, a polypropylene film with an average thickness of 300 μm and a polypropylene non-woven fabric are combined into a roll. Then the composite coil was placed in a high-pressure reactor, filled with 15MPa of carbon dioxide, and the temperature in the kettle was maintained at 80°C for 36 hours. Then start 20MHz ultrasonic vibration, and at the same time reduce the temperature in the kettle to 0°C, release the pressure to normal pressure, and take out the coil after the vibration is over.

[0038] Finally, the composite coil is placed on a steam forming machine, the temperature is controlled at 120-150° C., and the foaming time is 30 seconds to obtain a reflectivity of 99.5%. The density is 0.25g / cm 3 The uniform foaming film, the scanning electron micrograph of its slice is attached figure 1 As shown, the cell diameter is between 5-20 μm.

Embodiment 2

[0040] First, a polypropylene film with an average thickness of 300 μm and a polypropylene non-woven fabric are combined into a roll. Then place the composite coil in a high-pressure reactor, fill it with 7.5MPa of carbon dioxide, and keep the temperature in the kettle at 80°C for 40 hours. Then start 20MHz ultrasonic vibration, and at the same time reduce the temperature in the kettle to 0°C, release the pressure to normal pressure, and take out the coil after the vibration is over.

[0041] Finally, the composite coil is placed on a steam forming machine, the temperature is controlled at 120-150° C., and the foaming time is 30 seconds to obtain a reflectivity of 99.1%. The density is 0.33g / cm 3 uniform foam film.

Embodiment 3

[0043] First, a polyester film with an average thickness of 350 μm and a polyester non-woven fabric are combined into a roll. Then place the composite coil in the autoclave, fill it with 15MPa carbon dioxide, and keep the temperature in the autoclave at 120°C for 40 hours. Then start 30MHz ultrasonic vibration, and at the same time reduce the temperature in the kettle to 0°C, release the pressure to normal pressure, and take out the coil after the vibration is over.

[0044] Finally, the composite coil is placed on a hot roll forming machine, the temperature is controlled at 200-240° C., and the foaming time is 10 seconds to obtain a reflectivity of 99.8%. The density is 0.35g / cm 3 uniform foam film.

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Abstract

The invention discloses a preparation method of a polymer micro-foaming film. The preparation method comprises the following steps of: (1) uniformly rolling a polymer film of which the thickness is 200-500 mu m and an interval material into a coiled material; (2) putting the coiled material in a supercritical fluid reaction kettle, controlling the coiled material to be at a higher temperature and a higher pressure, so that the supercritical fluid is permeated and swelled in a polyester coiled material so as to achieve the state of saturation; (3) after achieving the state of saturation, using an ultrasonic technology in an assisting manner, enabling kernels to be uniformly formed in the inner part of a polymer film, releasing the supercritical fluid in the reaction kettle, and taking out the coiled material in which the kernels are formed; and (4) putting the coiled material in a heat source, enabling internal gas nucleus to grow, and foaming pores to form so as to prepare micro-foaming film of which the pore diameters are uniform and the foaming pores are close. The preparation method disclosed by the invention is simple in technology, is clean and pollution-free, and is higher in efficiency; the thickness of the prepared polymer micro-foaming film is between 300-1000 mu m, the density of products is between 0.25-0.65g/cm<3>, the pore diameters are between 5-20 mu m, and the density of the pores is 1010-1012cells/cm<3>; reflection of visible light can reach more than 98%.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a method for preparing a polymer microfoaming film. technical background [0002] Polymer film materials with a porous structure have a long history. The common ones are polyolefin microporous film and polyester microporous film, which are widely used in battery separators, light reflectors, and sound analysis diaphragms. [0003] Common preparation methods include thermal orientation shrinkage method, soluble matter extraction method, supercritical fluid foaming method and other methods. The thermal shrinkage orientation method is suitable for easily crystallized materials, the process is complex and the control precision is high, the film pore structure is anisotropic, and the pore size distribution is uneven. The soluble matter extraction method needs to use a large amount of solvent to elute the soluble matter in the film. The prepared film h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00C08J7/12C08L23/12C08L67/02C08L71/10C08L79/08B32B27/06B32B37/00
Inventor 吴雨晨潘洁陈培军
Owner 青岛中诚高分子科技有限公司
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