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Transparent impact resistant polyester composition

A technology of impact resistance and composition, which is applied in the field of polyester composition, can solve the problems of high addition amount, increased PET haze, and no obvious improvement in impact resistance strength, etc., and achieves excellent impact resistance and low temperature cold resistance , the effect of good transparency

Active Publication Date: 2019-02-05
FAR EASTERN NEW CENTURY COPRRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the impact modifiers require a high amount of addition, and can only achieve a certain impact resistance effect at room temperature. At low temperatures, the impact resistance properties are improved, and the effect is not significant.
In addition, adding a high dose of impact modifier will lead to poor transparency of the finished polyester composition
Furthermore, the high addition of impact modifiers will also cause a decrease in the modulus of PET, resulting in insufficient stiffness of PET and making it difficult to form.
[0007] In the prior art, adding SBC to PET modified without 1,4-cyclohexanedimethanol (CHDM) did not significantly improve the impact strength, and the PET modified with CHDM would have problems in recovery. The problem is that the PET haze increases, resulting in opacity

Method used

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  • Transparent impact resistant polyester composition
  • Transparent impact resistant polyester composition
  • Transparent impact resistant polyester composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2、 comparative example 1-2

[0048] Put 100 parts by weight of PET ester pellets into an oven at 140°C, dry for 12 hours, dry to a moisture content of less than 50 ppm, and mix with 1 part by weight of non-linear SBC plastic pellets evenly. The non-linear SBC with different butadiene unit content is selected here, the non-linear SBC model and its butadiene unit content are shown in Table 4, wherein the butadiene unit content is weight percentage, based on the total weight of SBC count. The homogeneously mixed ester pellets are put into a sheet extruder to extrude, the temperature is set at 270°C, and the length-to-diameter ratio of the screw of the extruder is 28-36. The extruded sheet is measured for haze and low-temperature impact rupture rate. Among them, the cold resistance performance is ◎-○, which can effectively improve the low-temperature impact rupture rate of PET film, and the cold resistance performance is △-X, which means that the low-temperature impact failure rate of PET film cannot be effec...

Embodiment 3-4、 comparative example 5-6

[0056] Put 100 parts by weight of PET ester pellets into an oven at 140° C., dry for 12 hours, dry until the water content is less than 50 ppm, and mix with 1-12 parts by weight of branched-chain SBC plastic pellets evenly. Here, the non-linear SBC is selected from NEOS Styrolution 684D, whose butadiene unit content is 23 wt%. The homogeneously mixed ester pellets are put into a sheet extruder to extrude, the temperature is set at 270°C, and the length-to-diameter ratio of the screw of the extruder is 28-36. The extruded sheet is measured for haze and cold-resistant cracking rate. Among them, the cold-resistant performance of ◎-○ means that the cold-resistant cracking rate of PET film can be effectively improved, and the cold-resistant performance of △-X means that the cold resistance of PET film cannot be effectively improved. Combating the rupture rate, the results are shown in Table 5.

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Abstract

The present invention provides a transparent impact resistant polyester composition. The polyester composition comprises 100 parts by weight of polyester, and 0.1 to 6.0 parts by weight of styrene butadiene block copolymer, wherein a molecular weight of the styrene butadiene block copolymer is in the range from 100,000 to 200,000, and an intrinsic viscosity of the styrene butadiene block copolymeris in the range from 0.1 to 0.6.

Description

technical field [0001] The present invention relates to a polyester composition, in particular to a polyester composition with impact resistance. Background technique [0002] Linear polyesters, such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), are favored due to their good mechanical, optical and chemical resistance properties. Widely used in various vacuum or pressure forming plastic products. For example, packaging boxes and containers made of PET film. However, in the process of packing and transporting the finished product, it is prone to collision and fragmentation, or the drop resistance in low temperature environment is not good, resulting in an increase in production cost and a decrease in yield. [0003] In order to improve the impact resistance of PET at room temperature or low temperature, impact modifiers are usually added therein, for example, US Patent No. 5,041,499 proposes PET modified in 1,4-cyclohexanedimethanol (CHDM) Add a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L53/02
CPCC08L67/02C08L2201/10C08L53/02
Inventor 张莉苓魏宽良徐传浩陈珏伶
Owner FAR EASTERN NEW CENTURY COPRRATION