Lightweight and low dielectric constant pbt copolyester masterbatch and preparation method of polyester film
A low-dielectric-constant, copolyester technology, applied in the field of lightweight low-dielectric-constant PBT copolyester masterbatch and polyester film preparation, can solve the problem of decreased material toughness, large dielectric loss, and failure to meet application requirements and other problems, to achieve the effect of dielectric loss tangent and density reduction and low dielectric constant
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Embodiment 1
[0024] The monomer formula is shown in Table 1. In a 20L general-purpose polymerization reaction kettle, the corresponding amount of the reaction monomer was added to the reaction kettle, replaced with nitrogen, heated up, and esterified at 190 ° C under normal pressure, and esterified for 180 min. The end point of esterification is reached when the amount of water produced reaches 2100 mL. Close the rectification column, open the vacuum system, gradually open the vacuum valve, transition from low vacuum to high vacuum within 45 minutes, the pressure in the reactor is reduced to 10Pa, and the temperature in the reactor is raised to 250 ° C at the same time. Polymerization reaction, the polymerization time is 150min, the reaction is stopped, the material is discharged, and the low dielectric constant PBT copolyester that meets the requirements is prepared; The phenolic resin hollow microspheres were uniformly mixed at high speed according to the proportion in Table 1. The parti...
Embodiment 2
[0028]The monomer formula is shown in Table 1, and the preparation process of the lightweight low-dielectric constant PBT copolyester masterbatch is the same as that in Example 1. Different from Example 1, the esterification temperature was 200°C, the esterification reaction time was 200min, the polymerization temperature was 255°C, the polymerization reaction pressure was 50Pa, the reaction time was 140min, the particle size of the phenolic resin hollow microspheres was 12 μm, and the wall was 12 μm. The thickness is 2.5 μm.
[0029] The lightweight and low dielectric constant PBT copolyester masterbatch is dried, mixed with conventional PET chips according to the mass ratio of 1:1, and then melted, extruded, cooled, stretched and wound through an extruder. A lightweight low-dielectric constant polyester film, that is, a PET film, is prepared. The properties of lightweight and low dielectric constant PBT copolyester masterbatch and PET film are shown in Table 2.
Embodiment 3
[0031] The monomer formula is shown in Table 1, and the preparation process of the lightweight low-dielectric constant PBT copolyester masterbatch and polyester film is the same as that of Example 1. Different from Example 1, the esterification temperature was 210°C, the esterification reaction time was 210min, the polymerization temperature was 260°C, the polymerization reaction pressure was 80Pa, the reaction time was 130min, the particle size of the phenolic resin hollow microspheres was 10 μm, and the wall was 10 μm. Thickness is 2 μm.
[0032] The properties of lightweight and low dielectric constant PBT copolyester masterbatch and PBT film are shown in Table 2.
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