Heat-shrinkable PETG (polyethylene terephthalate glycol) black-and-white composite film with light shielding property

Heat-shrinkable PETG (polyethylene terephthalate glycol) black-and-white composite film with light shielding property

  • CN 111,452,469 A
  • Filed: 03/26/2020
  • Published: 07/28/2020
  • Est. Priority Date: 03/26/2020
  • Status: Active Application
First Claim
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1. A heat-shrinkable PETG black-white composite film with light shielding performance is characterized by adopting an A-B-C structure, wherein an A layer is a printing layer and is made of a mixture of PETG resin and a shedding agent, and the shedding agent is 10-30 mass percent of SiO2The anti-blocking master batch is mixed with 70 to 90 mass percent of PETG resin, and the addition amount of the anti-blocking master batch is 1 to 4 percent of the total weight of the printing layer;

  • the layer B is a white structure layer and is made of a mixture of PETG resin and a white additive, and the white additive is 55-65 mass percent of TiO2And 35-45% of PETG resin by mass percent, wherein the addition amount of the PETG resin is 10-30% of the total weight of the white structure layer;

    the layer C is a black structure layer and is made of a mixture of PETG resin and a black additive, the black additive is a black master batch formed by mixing 30-50% of carbon black by mass and 50-70% of PETG resin by mass, and the addition amount of the black master batch is 5-10% of the total weight of the black structure layer;

    after the heat-shrinkable PETG black-and-white composite film with the light shielding property is treated in warm water at 90 ℃

    for 10s, the heat shrinkage rate of MD in the longitudinal stretching direction is less than or equal to 5 percent;

    after being treated in warm water at 90 ℃

    for 10s, the heat shrinkage rate of the transverse stretching direction TD is between 50 and 75 percent;

    the tensile strength of the MD in the longitudinal direction is more than or equal to 45 MPa;

    the tensile strength in the transverse direction TD is more than or equal to 200 MPa;

    the elongation at break in the machine direction MD is more than or equal to 350 percent;

    the elongation at break of the transverse direction TD is more than or equal to 50 percent, and the apparent density is less than or equal to 1.45g/cm3The glossiness in the 45-degree direction is more than or equal to 20, the light transmittance is 0, the static friction coefficient is less than or equal to 0.60, and the dynamic friction coefficient is less than or equal to 0.55.

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