Montmorillonite modified polyester and preparation method thereof

A technology of montmorillonite and polyester, applied in the field of montmorillonite/PET nanocomposite and its in-situ preparation, can solve the problems of high cost, unsatisfactory results and high temperature of processing molds

Inactive Publication Date: 2008-06-18
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The method of industrially adding inorganic fillers to PET is melt blending. The filled inorganic fillers include: glass fiber, talcum powder, kaolin, wollastonite, etc. These methods can improve PET crystallinity and gas barrier to a certain extent. However, due to the high energy consumption of PET melt blending and compounding, it is easy to degrade, and the equipment wears a lot, so the results are not satisfactory.
It has also been reported that the use of organic core-shell structure to modify PET, although the obtained PET composite has good mechanical properties, but the processing mold temperature of the composite is relatively high, and the heat distortion temperature (HDT) has been greatly reduced.
It is also reported that PET composite materials are prepared from fluorine mica, and the preparation process is more complicated and the cost is higher.

Method used

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  • Montmorillonite modified polyester and preparation method thereof
  • Montmorillonite modified polyester and preparation method thereof

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preparation example Construction

[0034] The preparation method of the present invention is described in detail below:

[0035] Preparation

[0036] The preparation method of montmorillonite modified polyester of the present invention comprises the steps:

[0037] (a) providing an aqueous mixture of 1 to 4 parts by weight of montmorillonite raw soil, 50 to 80 parts by weight of ethylene glycol in 50 to 500 parts by weight of water;

[0038] (b) mixing the aqueous mixture obtained in step (a) with 40 to 80 parts by weight of dimethyl terephthalate to obtain a mixture;

[0039] (c) The mixture obtained in step (b) is polymerized at 160-290° C. to obtain the montmorillonite-modified polyester.

[0040] In order to make the dispersion more uniform, preferably, the aqueous mixture of step (a) is obtained through the following steps: providing an aqueous dispersion of 1 to 4 parts by weight of montmorillonite in 50 to 500 parts by weight of water, and adding the dispersion to 50-80 parts by weight of ethylene gly...

Embodiment 1

[0071] Disperse 1 part of montmorillonite in 100 parts of boiling water, stir for 2 hours, then add 0.2 parts of PEG with a molecular weight of 1000, add 80 parts of EG after ultrasonic dispersion for 3 hours, remove the water after dispersion, and then add to the reactor In; 80 parts of DMT, 0.03 parts of antimony trioxide and 0.12 parts of calcium acetate were added to the reactor. Under the protection of nitrogen, the temperature was raised to 180°C for 2 hours, the vacuum degree was kept below 60Pa, the temperature was raised to 280°C for 3 hours, the reaction was stopped, and the product was taken out.

Embodiment 2

[0073] With embodiment 1, only change the content of MMT to be 2 parts.

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Abstract

The present invention provides a preparation method of imvite modified polyester, including the following steps: (a) aqueous mixture of 1 to 4wtg. imvite original soil, 50 to 80wtg. glycol and 50 to 500wtg. water is provided; (b) the aqueous mixture in step (a) is mixed with 40 to 50wtg. terephthalic acid dimethyl ester; (c) the mixture in step (b) is polymerized under the temperature of 160 to 290 DEG C so as to obtain the imvite modified polyester. The present invention also provides composite material prepared by the method. The polyester composite material has excellent air barrier property and crystallization property.

Description

technical field [0001] The invention relates to a montmorillonite / PET nanocomposite material with high crystallization performance and good gas barrier property and an in-situ preparation method thereof. Background technique [0002] PET is a polymer with excellent comprehensive properties, widely used in fibers, films and engineering plastics. However, due to its low heat distortion temperature, low crystallization rate, poor dimensional stability, and poor gas barrier properties, its wide application in the field of engineering plastics is limited. [0003] Especially since the early 1980s, PET has gradually become the fastest growing resin in the packaging industry in the world. However, the barrier properties of PET to oxygen, carbon dioxide and some organic solvents are average, which is far from meeting the requirements for some special packaging materials; at the same time, the crystallization rate of PET is low during processing, which increases the cycle of process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/03C08K3/34C08G63/78C08G63/183C08G63/46
Inventor 闫东广解廷秀杨桂生
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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