Preparation method of microporous foamed polypropylene reflecting film

A technology of microporous foaming and microporous foaming materials, which is applied in the field of preparation of microporous foamed polypropylene reflective film, can solve the problems of low diffuse reflectivity, high specular reflectivity, glare, etc., and achieve high reflectivity , good pore size uniformity

Inactive Publication Date: 2018-01-26
宁波致微新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the reflectors manufactured in China are mainly non-foaming films doped with calcium carbonate and titanium dioxide powder. The specular

Method used

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  • Preparation method of microporous foamed polypropylene reflecting film
  • Preparation method of microporous foamed polypropylene reflecting film
  • Preparation method of microporous foamed polypropylene reflecting film

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preparation example Construction

[0020] The invention relates to a preparation method of a microporous foamed polypropylene reflective film, comprising step 1, step 2, step 3 and step 4,

[0021] Step 1: Place the polypropylene material in the pressure vessel A, seal the pressure vessel A, raise the temperature to the infiltration temperature, the infiltration temperature is 40℃~110℃, fill the supercritical fluid to the infiltration pressure, the infiltration pressure is 1~15MPa, Then infiltrate under the infiltration temperature and infiltration pressure, and the infiltration time is 10-600min;

[0022] Step 2: The temperature of pressure vessel B is kept at the saturation temperature, and the saturation temperature is 120°C ~ 160°C, and then go through the "unload-take-install-close-fill" procedure, and the "unload-take-install-close-fill" procedure Complete within 5 minutes, then the pressure vessel B is saturated at the saturation temperature and pressure, and the saturation time is 10-60 minutes;

[002...

Embodiment 1

[0073] Place the polypropylene plate (the Mw / Mn of the polypropylene resin is 2.6, the MFR is 1.8g / 10min, the size is 40cm×40cm×2cm) in the pressure vessel A, and the pressure vessel A is sealed, the temperature is raised to 100°C, and filled with Supercritical carbon dioxide to 12MPa, then soak for 120min;

[0074] The temperature of pressure vessel B is kept at 144°C, and then undergoes the procedure of "unloading-taking-installing-closing-filling", and the completion time of the procedure of "unloading-taking-installing-closing-filling" is 115s, and then pressure vessel B is saturated Saturated under temperature and saturation pressure, the saturation time is 30 minutes, the specific steps of the "unloading-taking-installing-closing-filling" procedure are: depressurize the pressure vessel A, take out the soaked polypropylene sheet from the pressure vessel A, And put it into the pressure vessel B, seal the pressure vessel B, fill with supercritical carbon dioxide to the satu...

Embodiment 2

[0078] The same as Example 1 except that the polypropylene raw material constituting the polypropylene sheet in Example 1 was changed (the Mw / Mn of the polypropylene resin was 13.2, and the MFR was 5.7 g / 10min).

[0079] The resulting microporous foamed polypropylene reflective film has a density of 0.033g / cm 3 , and the internal cell morphology was analyzed by scanning electron microscopy, such as figure 2 As shown, the measured average pore diameter is 22 μm, the number of cells whose diameter is more than 2 times the average diameter is 1.8%, the cell uniformity is good, and the calculated cell density is 5.13×10 9 piece / cm 3 , and its reflectivity was measured to be 96%.

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Abstract

The invention relates to a preparation method of a microporous foamed polypropylene reflecting film. The preparation method comprises steps as follows: a polypropylene sheet material is placed in a device with specific infiltrating temperature and infiltrating pressure of specific supercritical fluid, temperature preservation and pressure maintaining are performed for specific time, then temperature preservation and pressure maintaining are performed for specific time at higher saturation temperature and under higher supercritical fluid saturation pressure, pressure is released at a specific pressure release rate, a microporous foamed polypropylene material can be obtained, and the microporous foamed polypropylene reflecting film is obtained through splitting. The method is suitable for industrial production and can be used for preparing the microporous foamed polypropylene reflecting film efficiently.

Description

technical field [0001] The invention belongs to the field of preparation of polymer microporous foaming, and in particular relates to a preparation method of a microporous foaming polypropylene reflective film. Background technique [0002] Microcellular foaming technology refers to the use of thermoplastic materials as the matrix, through special processing technology, so that the closed micropores with a cell size of 1 micron to tens of microns are densely distributed in the middle of the product. [0003] Facing the wave of global energy saving, the industry has stepped into the field of lighting fixtures, expecting to use low-power, high-efficiency LEDs and cold cathode lamps (CCFL) to replace inefficient fluorescent tubes. Although the development of new light source lamps has great market prospects, due to the structural factors of the light-emitting elements themselves, after the lamps are manufactured, there will be varying degrees of glare and uneven brightness. At...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L23/14
Inventor 周发俊李文强韩鹿伟
Owner 宁波致微新材料科技有限公司
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