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High-viscosity easy-processing ethylene glycol terephthalate and preparation method thereof

A technology of polyethylene terephthalate and ethylene glycol phthalate, which is applied in the field of ethylene terephthalate resin, can solve the problem that the processing performance of materials has not been improved, and achieve molecular weight distribution change , wide molecular weight distribution, and the effect of improving crystallization performance

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also the processability of the material in this patent has not been improved

Method used

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  • High-viscosity easy-processing ethylene glycol terephthalate and preparation method thereof
  • High-viscosity easy-processing ethylene glycol terephthalate and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0031] Take 500g of PET slices with an intrinsic viscosity of 0.98dl / g, produced by Yizheng Chemical Fiber, and dry them in a common oven at 110°C for 24 hours, and then dry them in a vacuum oven at 100°C for 12 hours. Take 0.5 g of glycerol (produced by Beijing Chemical Reagent Factory) and 1 g of nucleating agent, add the weighed mixture into a high-speed mixer, and mix for 4 minutes to form a uniform mixture. Then it is fed into a twin-screw extruder by a feeder, blended and extruded into strips, and then pelletized by a pelletizer.

[0032] The processing technology is: the temperature of the first zone of the twin-screw extruder is 230°C, the temperature of the second zone is 270°C, the temperature of the third zone is 275°C, the temperature of the fourth zone is 280°C, and the die temperature is 285°C.

[0033] See Table 1 for the data.

Embodiment 2

[0035] With embodiment 1, difference is to adopt pentaerythritol as branching agent, and its consumption is 0.3g. See Table 1 for the data.

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Abstract

The invention discloses a polyethylene glycol terephthalate composition comprising polyethylene glycol terephthalate with the viscosity greater than 0.85 dl / g, a micromolecule branching agent and a crystallization nucleating agent. By adding of the nucleating agent and the micromolecule branching agent into the high viscosity polyethylene glycol terephthalate, the crystallization performance of a material can be improved on the premise of maintain of the high viscosity of the material, the material molecular weight distribution becomes wider, and the material is obvious in shear thinning behavior, so that the material machine shaping is facilitated.

Description

technical field [0001] The invention relates to a polyethylene terephthalate resin, in particular to a polyethylene terephthalate resin with good processability. The present invention also relates to a method for preparing the above-mentioned resin. Background technique [0002] The thermoplastic polyethylene terephthalate (PET) is widely used in products such as extrusion, injection and blow molding, and biaxially oriented due to its excellent mechanical strength, transparency, thermal stability and impact strength, and low permeability . However, due to the low melt viscosity of thermoplastic polyethylene terephthalate, the crystallization speed is slow. Its crystallization rate is slower than some other plastics such as polybutylene terephthalate and high-density polyethylene, thus limiting its application in engineering plastics. In the application of PET, under the premise of maintaining its high melt viscosity, it is also required to have high crystallinity to meet ...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L23/08C08L33/02C08K5/098
Inventor 张龙贵任敏巧侯家祥郭敏郭梅芳王良诗
Owner CHINA PETROLEUM & CHEM CORP
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