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Multilayer thin film and its preparation method and time temperature indicating device

A multi-layer thin film and thin film technology, applied in thermometers, measuring devices, chemical instruments and methods, etc., can solve the problems of unable to meet the timing requirements of time and temperature indicators, poor penetration effect of phase change materials, and inconspicuous micropore characteristics, etc. Achieve the effect of firm bonding, good gas-liquid barrier performance, and improved affinity

Active Publication Date: 2017-12-19
SHENZHEN NINE STARS PRINTING & PACKAGING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the HDPE polymer material used in the middle layer is not stretched, its microporous characteristics are not obvious, the liquid affinity is poor, the penetration effect of the phase change material is poor, or even impermeable, which cannot meet the timing requirements of the time temperature indicator

Method used

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  • Multilayer thin film and its preparation method and time temperature indicating device
  • Multilayer thin film and its preparation method and time temperature indicating device

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preparation example Construction

[0039] The invention also provides a method for preparing a multilayer film, with reference to figure 1 In one embodiment, the preparation method of the multilayer film includes:

[0040] Step 10. Mix the inorganic pigment particles and the polymer material powder uniformly to obtain a mixed powder. Among them, the inorganic pigment particles and the polymer material powder are preferably mixed by grinding until the color is uniform.

[0041] Step 12: Hot-press the mixed powder to prepare a film, and stretch the film to obtain a sandwich layer. The sandwich layer has micropores through which liquid can penetrate into the sandwich layer. Among them, hot pressing preferably uses a hot plate to heat the mixed powder in a molten state for 5 minutes under a pressure of 5 tons, and then stretch the film after cooling to a certain extent.

[0042] Step 14. Provide a dense polymer film as an interlayer, and at least one interlayer is provided on both sides of the sandwich layer. Among them...

Embodiment 1

[0054] S1. Provide inorganic pigment particles;

[0055] Select nano-level hydrophobic silica powder as the inorganic pigment particles, and silica has the characteristics of low cost, safety and easy handling.

[0056] S2, prepare the sandwich layer;

[0057] Add 0.4g of hydrophobic nano-silica powder to 2.0~4.0g of low-density polyethylene powder material, grind the above two powders until the color is uniform, and then use a hot plate to grind the ground powder under a pressure of 5 tons. After being hot pressed at ℃ for 5 minutes and cooled to a certain degree, the film was biaxially stretched to prepare a low density polyethylene microporous film with a thickness of 0.1 mm.

[0058] S3. Preparation of multilayer film;

[0059] Select the PET film and BOPP film with a thickness of 15um as the interlayer respectively. According to the sequence of PET film / low density polyethylene microporous film / BOPP film, through co-extrusion or compounding, a white three-layer with a thickness of...

Embodiment 2

[0061] S1. Provide inorganic pigment particles;

[0062] Select nano-level hydrophobic Prussian blue pigment as the inorganic pigment particles.

[0063] S2, prepare the sandwich layer;

[0064] In order to match the hydrophobic inorganic pigment particles, polyethylene with hydrophobic characteristics is selected as the sandwich layer material of this embodiment;

[0065] Add 0.2g of hydrophobic Prussian blue pigment particles to 2.0~4.0g of medium density polyethylene powder material, grind the above two powders until the color is uniform, and then use a hot plate to grind the ground powder at 115°C under a pressure of 5 tons. After hot pressing for 5 minutes and cooling to a certain extent, the film is biaxially stretched to prepare a blue medium density polyethylene microporous film with a thickness of 0.15 mm.

[0066] S3. Preparation of multilayer film;

[0067] The PVC film and LDPE film with a thickness of 15um are respectively selected as the interlayer, according to the order ...

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Abstract

The invention discloses a multi-layer film, a preparation method therefor and a time and temperature indicating device. The multi-layer film comprises at least two interlayers and a sandwich layer arranged between the two interlayers. The interlayers are high-molecular compact films. The sandwich layer comprises a polymeric material and inorganic pigment particles loaded in the polymeric material. Micropores are arranged in the sandwich layer, therefore liquid can penetrate in the sandwich layer through the micropores. The sandwich layer of the multi-layer film loads the inorganic pigment particles in the polymeric material, the micropore characteristics are obvious and the liquid affinity is good.

Description

Technical field [0001] The present invention relates to the technical field of thin films, in particular to a multilayer thin film, a preparation method thereof, and a time temperature indicating device. Background technique [0002] The existing multi-layer film includes two interlayers and an intermediate layer located between the two interlayers. The interlayer is LLDPE (Linear Low Density Polyethylene) polymer material, and the intermediate layer is HDPE (High Density Polyethylene). Polyethylene, high-density polyethylene) polymer material. The multilayer film has excellent moisture resistance and is suitable for packaging various humidity-sensitive materials. [0003] The multilayer film can be used in a time temperature indicator. The indication principle of the time temperature indicator is that the phase change material in the time temperature indicator has a freezing point. When the ambient temperature is higher than the freezing point, the phase change material is in a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/20G01K11/06
CPCB32B27/08B32B27/20B32B2250/03B32B2307/4026B32B2457/00G01K11/06
Inventor 刘永生郭欣刘文恒曾海明许第军王斌何华尚要俊
Owner SHENZHEN NINE STARS PRINTING & PACKAGING GRP
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