Ultra-thin high-sub-polyester film and preparation method thereof

Abstract

The invention discloses an ultra-thin high-sub-polyester film, which is characterized in that the polyester film is mainly prepared from a blending material consisting of sub-gloss polyester containing inorganic powder and polyethylene glycol through melting and plasticizing, casting and stretching treatment. The invention also discloses a preparation method of the polyester film. Compared with a conventional high-concentration matte polyester master batch, the high-concentration matte polyester film has the advantages that in the preparation process, the extrusion pressure of an extruder is reduced by 10 percent or more, and the maximum stretching ratio is improved by 20 percent or more; and compared with a conventional high-concentration matte polyester master batch with the same content of inorganic powder, the high-concentration matte polyester film is reduced in thickness by 30% or more through addition of PEG .

Description

technical field [0001] The invention relates to a high sub-polyester film and a preparation method thereof, in particular to an ultra-thin high sub-polyester film and a preparation method thereof. Background technique [0002] In addition to the superior chemical and physical properties of ordinary polyester films, matt polyester films also have the characteristics of high haze and low gloss. They are generally used in aluminum plating, printing and other fields. Considering the product cost, users generally want thinner films. The better, on the one hand, it can improve the production efficiency of the film, and on the other hand, it can reduce the cost of the film. [0003] Matte films can be divided into high-matte, middle-matte and low-matte films by gloss or haze index, among which, high-matte films generally refer to glossiness <20. Compared with medium and low sub-films, the content of inorganic powder in high sub-films is higher, so the polymerization process for...

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Problems solved by technology

Compared with medium and low sub-films, the content of inorganic powder in high sub-films is higher, so the polymerization process for preparing high-concentration matt polyester masterbatch is more complicated, and the high content of inorganic powder in high sub-films leads to its melt The fluidity is poor, so the process of melt plasticization and post-stretching is more difficult. At present, it is difficult for the film production line to stably produce high-matte films with a thickness below 20 μm. Film and post-process users are eager to solve the stretching problem of high-density thin matte films to improve economic efficiency

[0004] In order to prepare high sub-polyester film with low haze, European patent EP20040292424 uses talcum powder as an additive to prepare matte film, which reduces the transparency and gloss of the film, but talcum powder is rarely used, and its quality is greatly affected by the origin of raw materials. The quality is difficult to guarantee, and it is difficult to promote on a large scale in subsequent applications, and the present invention does not involve the preparation of thin high sub-films

People such as Zhang Chunxiao used micro-nano composite additives to improve the matt effect in "Preparation of Matte Polyester Film" (New Chemical Materials, 2003, (7)), but the micro-nano powder is difficult to disperse evenly in the material, and It is difficult to prepare ultra-thin high sub-polyester film with high content of inorganic additives

Chinese patent 201010185433.0 uses nano-, sub-nanometer, and micron-scale composite additives to produce films. The size of the additives varies greatly, and the thickness of the prepared film is more than 125 μm. It is also difficult to prepare ultra-thin high-sub-polyester films.

German patent DE20001022943 discloses a matt white biaxially oriented polyester film, using diethylene glycol DEG, polyethylene glycol PEG / isophthalic acid IPA to make cycloolefin matt copolyester, with the addition of DEG It can improve the tensile properties of the matte film, but it will seriously affect the thermal stability of the copolyester, resulting in a drop in melting point and the precipitation of oligomers. It has potential safety hazards when used in food packaging and other fields, and the poor stability is difficult to reuse

[0005] Therefore, there are technical problems such as uneven melting and plasticization, difficulty in stretching, and difficulty in stable production of ultra-thin films in the preparation process of existing high-grade polyester films.

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