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Rapidly crystallized polyethylene glycol terephthalate composite material and preparation method thereof

A polyethylene terephthalate and composite material technology, which is applied in the field of rapidly crystallizing PET composite materials, can solve the problems of reducing production cost, shortening molding cycle, and inconspicuous effect, and achieves reducing production cost and shortening molding time. The effect of high cycle and crystallization performance

Inactive Publication Date: 2013-03-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic nucleating agents are not only cheap, but also resistant to chemical corrosion and have good processing stability. However, compared with organic nucleating agents, the nucleating efficiency of inorganic nucleating agents is poor, and the melting and crystallization temperature can only be increased by 10°C; In molding, it is usually desirable to set the mold temperature near the cold crystallization temperature to ensure that the product has a high degree of crystallinity, and a lower mold temperature can shorten the molding cycle and reduce production costs, and the use of inorganic particles as nucleating agents is also It can reduce the cold crystallization temperature to a certain extent, but since the effect of reducing the cold crystallization temperature is not obvious when only adding nucleating agent, the mold temperature cannot be set lower to ensure that the product has a higher degree of crystallinity and shorten the molding process. Cycle time, reduce production cost

Method used

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  • Rapidly crystallized polyethylene glycol terephthalate composite material and preparation method thereof
  • Rapidly crystallized polyethylene glycol terephthalate composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 56.82g of PET pellets with an intrinsic viscosity [η] of 0.80 and 0.18g of expanded graphite with a particle size of 90 mesh and an expansion factor of 300 times were put into a high-speed mixer and mixed for 6 minutes under high-speed shear at 15,000rpm , to obtain a powder mixture of PET and expanded graphite; the powder mixture is pre-mixed with 3 g of PEG with a number average molecular weight of 2000 and then put into a Haake torque rheometer, and melt blended at 265 ° C for 8 min, That is, the PET composite material is obtained.

[0028] The composite material has a melt crystallization temperature of 219°C, a glass transition temperature of 55°C and a cold crystallization temperature of 94°C as tested by DSC.

Embodiment 2

[0030] Put 59.1 g of PET pellets with an intrinsic viscosity [η] of 0.85 and 0.3 g of expanded graphite with a particle size of 80 mesh and an expansion factor of 250 times in a high-speed mixer, and mix for 4 minutes under high-speed shear at 18,000 rpm , to obtain a powder mixture of PET and expanded graphite; the powder mixture is pre-mixed with 0.6 g of PEG with a number average molecular weight of 1000, then put into a Haake torque rheometer, and melt blended at 270 ° C for 6 min , That is, PET composite material.

[0031]The composite material has a melt crystallization temperature of 215°C, a glass transition temperature of 65°C and a cold crystallization temperature of 108°C as tested by DSC.

Embodiment 3

[0033] Put 57.9 g of PET pellets with an intrinsic viscosity [η] of 0.85 and 0.3 g of expanded graphite with a particle size of 100 mesh and an expansion factor of 300 times in a high-speed mixer, and mix for 4 minutes under high-speed shear at 16,000 rpm , to obtain a powder mixture of PET and expanded graphite; the powder mixture was premixed with 1.8 g of PEG with a number average molecular weight of 1500, and then put into a Haake torque rheometer, and melted and blended at 280 ° C for 6 min , That is, PET composite material.

[0034] The composite material has a melt crystallization temperature of 218°C, a glass transition temperature of 60°C and a cold crystallization temperature of 101°C as tested by DSC.

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Abstract

The invention discloses a rapidly crystallized polyethylene glycol terephthalate composite material which is characterized in that the composite material is prepared from 90 to 98.5 weight percent of polyethylene glycol terephthalate, 0.3 to 5 weight percent of expanded graphite and 1 to 5 percent of polyethylene glycol by melting blending; the melting crystallizing temperature of the composite material is in the range of 215 to 221 DEG C; the glass transition temperature of the composite material is in the range of 50 to 65 DEG C; and the cold crystallization temperature of the composite material is in the range of 90 to 108 DEG C. The invention also discloses a preparation method of the composite material. The expanded graphite can be rapidly crystallized in the cooling process, the polyethylene glycol can reduce the glass transition temperature of PET (polyethylene glycol terephthalate) by improving the motion activity of a polymer chain segment and ensure the PET crystals to stillgrow at high speed when being cooled to a die temperature, so that the overall crystallizing speed of the composite material is greatly improved, the forming period is shortened and the production cost is reduced. The preparation method disclosed by the invention has simple process. The production process is easy to control.

Description

technical field [0001] The invention belongs to the technical field of polyethylene terephthalate composite material and its preparation, in particular to a method for synergistically promoting the rapid crystallization of polyethylene terephthalate (PET) by using a nucleating agent and a crystallization accelerator And corresponding rapidly crystallized PET composites. Background technique [0002] Since the advent of PET in 1941, it was first industrialized by Dupont in 1953. Although PET can maintain excellent physical and mechanical properties in a wide temperature range, and has fatigue resistance, friction resistance and aging resistance Excellent, outstanding electrical insulation, stable to most organic solvents and inorganic acids, and low production energy consumption, known for good processability and mainly used as fibers, sheets and beverage bottles, but when PET is used as engineering plastics, there are: High glass transition temperature, poor nucleation abil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L71/08C08K7/24C08K3/04
Inventor 傅强苏娟娟王珂杨光辉陈枫张琴邓华杜荣妮
Owner SICHUAN UNIV
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