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CN-122003459-A - Film and method for producing the same

CN122003459ACN 122003459 ACN122003459 ACN 122003459ACN-122003459-A

Abstract

The film according to the embodiment is a film comprising a first polymer resin and a second polymer resin as heterogeneous resins, wherein the first polymer resin contains a polyamide-based repeating unit and a polyether-based repeating unit, the second polymer resin contains any one selected from the group consisting of a hydroxyl group, an acetal group, and a combination thereof in a branched chain, and the stretch recovery rate at N% elongation is derived from the following formula 1, and when the N% is 60%, the stretch recovery rate of the film is 90% or more. [ formula 1] tensile recovery (%) = (LfN-LiN)/(LfN-Li). In the above formula 1, lfN is the length of the film stretched at N% elongation, liN is the length at the time of recovering the stretched film, and Li is the length of the film before the stretching. The film of the embodiment can maintain excellent optical characteristics and excellent mechanical properties for a relatively long time.

Inventors

  • Jiang Kuanggao
  • ZHENG SHENGZHEN
  • Han Quanjiong

Assignees

  • 迈克沃有限公司

Dates

Publication Date
20260508
Application Date
20240502
Priority Date
20230926

Claims (10)

  1. 1. A film, which is characterized in that, Comprising a first polymer resin and a second polymer resin as heterogeneous resins, The first polymer resin contains a polyamide-based repeating unit and a polyether-based repeating unit, The second polymer resin contains any one selected from the group consisting of hydroxyl groups, acetal groups, and combinations thereof in a branched chain, The tensile recovery at N% elongation was derived according to the following formula 1, When the N% is 60%, the film has a stretch recovery ratio of 90% or more: [ 1] Stretch recovery (%) = (LfN-LiN)/(LfN-Li) In the above formula 1, lfN is the length of the film stretched at N% elongation, liN is the length at the time of recovering the stretched film, and Li is the length of the film before stretching.
  2. 2. The film of claim 1, wherein the film is a film of a film type, When the strain rate is 100%, the stress is 1N/mm 2 or less.
  3. 3. The film of claim 1, wherein the film is a film of a film type, The haze value of the film was 3% or less after being left at 60 ℃ for 7 days.
  4. 4. The film of claim 1, wherein the film is a film of a film type, When the N% is 100%, the stretch recovery ratio of the film is 75% or more.
  5. 5. The film of claim 1, wherein the film is a film of a film type, The film contains 10 wt% or more of the polyether-based repeating unit based on the sum of the first polymer resin and the second polymer resin.
  6. 6. The film of claim 1, wherein the film is a film of a film type, The tensile recovery attenuation coefficient (20-40) between the 20% elongation and the 40% elongation is derived from the following formula 2, The film has a tensile recovery attenuation coefficient (20-40) of 0.3 or less: [ 2] Elongation recovery rate attenuation coefficient (20-40) = In the formula (2) of the present invention, A 20 is the stretch recovery (%) of the film at 20% elongation, A 40 is the stretch recovery (%) of the above film at 40% elongation.
  7. 7. A film, comprising: polyether block amide copolymer resin, and A polyvinyl acetal resin, which is a polymer of a polyvinyl acetal resin, When the strain rate is 20%, the stress is 7N/mm 2 or less.
  8. 8. The film of claim 7, wherein the film is, The value of stress at a strain rate of 100% minus stress at a strain rate of 20% is 5N/mm 2 or less.
  9. 9. The film of claim 7, wherein the film is, The ratio of the stress at a strain rate of 300% is 1.4 or more based on the stress at a strain rate of 100%.
  10. 10. The film according to claim 1 or claim 7, wherein the film is a film-coating protective film.

Description

Film and method for producing the same Technical Field Embodiments relate to a film having excellent mechanical properties. Cross-reference to related applications This document claims priority from korean patent application No. 10-2023-0129043, which was filed on 26 th month 09 of 2023, and korean patent application No. 10-2023-0129042, which was filed on 26 th month 09 of 2023, the entire contents of which are incorporated herein by reference. Background Film laminates containing polyurethane (TPU), polyvinyl chloride (PVC) and the like have been conventionally attached to protect paint-coated surfaces applied to automobile exterior surfaces and the like. However, when the film laminate such as polyurethane or polyvinyl chloride is applied to a paint-coated surface, the elastic properties are significantly changed due to changes in the external environment, particularly in temperature, which results in a problem in the construction work. In winter, the temperature of the portion where the work is performed is individually managed by providing an internal air conditioner and a local heating device, but there are drawbacks in terms of work convenience, finish degree, and quality. The above background art is technical information held by the inventor for the deriving embodiment or acquired during the deriving process, and is not necessarily known to the general public before the application of the present invention. As related art, korean patent laid-open publication No. 10-2012-0022141, "release film for automobile coating film protective film", and the like are available. Disclosure of Invention Technical problem The purpose of the embodiment is to provide a film with excellent mechanical properties such as tensile recovery rate and strain rate. Solution to the problem In order to achieve the above object, the film according to one or more embodiments is a film comprising a first polymer resin and a second polymer resin as heterogeneous resins, the first polymer resin comprising a polyamide-based repeating unit and a polyether-based repeating unit, the second polymer resin comprising any one selected from the group consisting of a hydroxyl group, an acetal group, and a combination thereof in a branched chain. The stretch recovery at N% elongation is derived from the following equation 1, and when the N% is 60%, the stretch recovery of the film may be 90% or more. [ 1] Stretch recovery (%) = (LfN-LiN)/(LfN-Li) In the above formula 1, lfN is the length of the film stretched at N% elongation, liN is the length at the time of recovering the stretched film, and Li is the length of the film before the stretching. The stress (stress) of the film may be 1N/mm 2 or less when the strain rate (strain) is 100%. The haze value of the film may be 3% or less after the film is left at 60 ℃ for 7 days. When the N% is 100%, the stretch recovery ratio of the film may be 75% or more. The film may contain 10 wt% or more of the polyether-based repeating unit based on the sum of the first polymer resin and the second polymer resin. The stretch recovery rate attenuation coefficient (20-40) between the 20% elongation and the 40% elongation is derived from the following equation 2, and the stretch recovery rate attenuation coefficient (20-40) of the film may be 0.3 or less. [ 2] Elongation recovery rate attenuation coefficient (20-40) = In formula 2, a 20 is the stretch recovery (%) of the above film at 20% elongation, and a 40 is the stretch recovery (%) of the above film at 40% elongation. In order to achieve the above object, the film according to one or more embodiments includes a polyether block amide copolymer resin, and a polyvinyl acetal resin, the stress may be 7N/mm 2 or less when the strain rate is 20%. The stress at a strain rate of 100% minus the stress at a strain rate of 20% of the film may be 5N/mm 2 or less. The film may have a stress ratio of 1.4 or more at a strain rate of 300% based on a stress at a strain rate of 100%. The film may be a coating film-protecting film. ADVANTAGEOUS EFFECTS OF INVENTION The film of the embodiment can maintain excellent optical characteristics and excellent mechanical properties for a relatively long time. However, the effects of the embodiments are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description. Detailed Description The following detailed description is provided to enable any person having ordinary skill in the art to which the embodiments pertains to easily perform the embodiments. The embodiments may, however, be embodied in many different forms and are not limited to the examples described herein. In the specification, when reference is made to a certain component "comprising" another component, this is not meant to exclude other components, but to further include other components unless specifically stated to the contrary. In this specification, when it is referred