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High-temperature-resistant self-adhesive pure polyethylene protective film and preparation method thereof

A polyethylene protective film, high-density polyethylene technology, applied in chemical instruments and methods, flat products, other household appliances, etc., can solve the problems of easy delamination, high processing temperature, large temperature difference, etc., to improve uniformity and The effect of flatness, uniform flatness and uniform film thickness

Active Publication Date: 2022-02-25
江门市华龙膜材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this patent, PP filler is added to the adhesive layer, substrate layer and adhesive layer, and SEBS is also added to the adhesive layer. The processing temperature of PP filler and SEBS is high, and the temperature difference with polyethylene is large, and PP and polyethylene Poor compatibility, easy to delaminate, need to add unwinding masterbatch in the preparation process, prone to precipitation, difficult to meet the requirements of high-quality polarizers

Method used

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  • High-temperature-resistant self-adhesive pure polyethylene protective film and preparation method thereof
  • High-temperature-resistant self-adhesive pure polyethylene protective film and preparation method thereof
  • High-temperature-resistant self-adhesive pure polyethylene protective film and preparation method thereof

Examples

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preparation example Construction

[0029] The raw materials for the preparation of the outer layer include: metallocene low-density polyethylene and polyolefin plastomer; the mass ratio of the metallocene low-density polyethylene and polyolefin plastomer is 4-8:2-6;

[0030] The preparation raw materials of the middle layer include: high-pressure low-density polyethylene, metallocene medium-density polyethylene and high-density polyethylene; the mass ratio of the high-pressure low-density polyethylene, metallocene medium-density polyethylene and high-density polyethylene is 1 ~4:3~8:2~5;

[0031] The raw materials for preparing the inner layer include: high-pressure low-density polyethylene and high-density polyethylene; the mass ratio of the high-pressure low-density polyethylene to high-density polyethylene is 5-16:4-25.

[0032] In the present invention, the outer layer is a self-adhesive layer; in the raw materials for the preparation of the outer layer, the mass ratio of metallocene low-density polyethylen...

Embodiment 1

[0054] The self-adhesive pure polyethylene protective film with a temperature resistance of 120°C prepared in this example has a three-layer structure, which is an outer layer, a middle layer and an inner layer, and the weight ratio of the outer layer, middle layer and inner layer is 8:65:27; The ingredients of each layer are as follows:

[0055] Outer layer: metallocene low density polyethylene 5210G, POP K8852G, the mass ratio of metallocene low density polyethylene to POP is 7.3:2.6;

[0056] Middle layer: high pressure low density polyethylene 450E, metallocene medium density polyethylene SP4020, high density polyethylene 5960G, the mass ratio of high pressure low density polyethylene, metallocene medium density polyethylene and high density polyethylene is 1.5:7.2:2.2;

[0057] Inner layer: High-pressure low-density polyethylene 450E, high-density polyethylene 5960G, the mass ratio of high-pressure low-density polyethylene to high-density polyethylene is 5.5:22.3;

[005...

Embodiment 2

[0065] Change the extrusion mass ratio of the outer layer, middle layer and inner layer to 10:60:30, other conditions are consistent with Example 1, and the preparation method is the same as Example 1.

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Abstract

The invention relates to the technical field of optical protective films, and provides a high-temperature-resistant self-adhesive pure polyethylene protective film and a preparation method thereof. The high-temperature-resistant self-adhesive pure polyethylene protective film is prepared by co-extrusion film blowing of an outer layer, a middle layer and an inner layer. A polyolefin plastomer is added to the outer layer, so that the autohension of the outer layer is improved. The middle layer and the inner layer are made of high-pressure low-density polyethylene and high-density polyethylene, so that the transparency and temperature resistance of the film are improved. Meanwhile, metallocene medium-density polyethylene is added into the middle layer, and the temperature resistance is further improved while the stiffness of the film is improved. The invention also provides a preparation method of the high-temperature-resistant self-adhesive pure polyethylene protective film. Six sections of heating are arranged in a fourth heating area of a die head, independent temperature control is carried out on each section, temperature control is finer, and therefore the uniformity and flatness of the film are improved. An annular six-section heating system is arranged outside a die head adjusting ring, and the effect that the thickness of a discharged film is uniform and smooth is achieved by adjusting the temperature of each heating section.

Description

technical field [0001] The invention relates to the technical field of optical protective films, in particular to a polyethylene protective film and a preparation method thereof. Background technique [0002] Polarizers are widely used in optoelectronic displays, sunglasses, anti-glare goggles, filter lenses for photographic equipment, polarizing microscopes, 3D glasses, special medical glasses, etc. Among them, the market size and output value of optoelectronic displays are the largest. [0003] In the process of manufacturing and transporting polarizers, in order to prevent pollution or damage on the surface of the polarizers, a protective film needs to be attached to the surface of the polarizers. The preparation of polarizers such as PC and PMMA requires a hot pressing molding process. The temperature of hot pressing Higher, it is required that the protective film also needs to have higher high temperature resistance. At present, the common PE substrate protective film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/08B32B27/06B32B33/00B29D7/01
CPCB32B27/32B32B27/327B32B27/08B32B33/00B29D7/01B32B2250/242B32B2307/306B32B2307/412
Inventor 文斌森魏洪媚
Owner 江门市华龙膜材股份有限公司
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