Method for preparing low melt strength polyester / clay nanocomposites for CO2 foam

A technology of nanocomposites and low melt strength, which is applied in the field of preparation of polyester/clay nanocomposites, can solve the problems of energy and time consumption, and achieve the goals of saving time and energy, excellent gas barrier, and reducing process costs Effect

Inactive Publication Date: 2015-11-11
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires the polyol in-situ modified polyester to continue solid-state polycondensation for 24 hours to further increase its melt strength to meet the requirements of extrusion foaming, but it also consumes more energy and time

Method used

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  • Method for preparing low melt strength polyester / clay nanocomposites for CO2 foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Bottle-grade polyester chips (polymerization degree 150), chain extender pyromellitic anhydride, and organic clay modified by methyl-tallow-bis(2-hydroxyethyl) quaternary ammonium salt at 110 o Dried under C conditions for 12 hours, and fully premixed in the following parts by mass.

[0038] 100 pieces of polyester chips

[0039] 0.8 parts of chain extender

[0040] 1 part clay

[0041] The polyester / clay nanocomposite was obtained by melting and blending the premix with a twin-screw extruder, the screw speed was 240 rpm, and the screw barrel temperature was 270 o C, the die head temperature is 260 o c. The prepared polyester / clay nanocomposite is water-cooled and granulated for analysis and foaming.

Embodiment 2

[0043] Recycled polyester bottle flakes (polymerization degree 125), chain extender pyromellitic anhydride at 100 o Dried under C conditions for 8 hours, and fully premixed in the following parts by mass.

[0044] 100 copies of recycled polyester bottle flakes

[0045] 0.5 parts of chain extender

[0046] Recycled polyester bottle flakes and chain extender premix are reactively extruded through a single-screw extruder to prepare modified polyester. The residence time of the material in the extruder is 120 seconds, and the extrusion temperature is 285 o c. The extrudate is water-cooled, pelletized, and modified clay with 1-decyl-2-methyl-3-dodecyl imidazolium salt at 120 o C and dried for 14 hours, and fully mixed in the following parts by mass.

[0047] Modified polyester 100 parts

[0048] 3 parts clay

[0049] The premixture of modified polyester and organically modified clay was melt-blended by a twin-screw extruder to obtain a polyester / clay nanocomposite. The spee...

Embodiment 3

[0051] Engineering plastic grade polyester chips (polymerization degree 200) and octadecyl-bis(2-hydroxyethyl) quaternary ammonium salt modified organoclay at 120 o Fully dry under C conditions for 12 hours, and fully premix in the following parts by mass.

[0052] 100 pieces of polyester chips

[0053] 10 parts clay

[0054] The above premixture is melted and blended by a twin-screw extruder to prepare a polyester / clay nanocomposite masterbatch. The rotating speed of the twin-screw extruder is 200 revolutions per minute, and the screw barrel temperature is 270 o C, die head temperature 265 o c. The extruded product is water-cooled and granulated, and is mixed with engineering plastic grade polyester chips (polymerization degree 200), epoxy chain extender 4,4′-diaminodiphenylmethane tetraglycidyl ether at 100 o C under the condition of drying for 15 hours, and fully mixed in the following parts by mass.

[0055] 100 pieces of polyester chips

[0056] Nanocomposite maste...

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Abstract

The invention relates to a method for preparing low melt strength polyester / clay nanocomposites for CO2 foam, and relates to three raw materials: a, a commercialized polyester chip or recycled polyester; b, multifunctional chain extender; c, organic modified clay. The method comprises three technology paths: A, premixing raw material a, raw material b and raw material c according to certain parts by mass, and then performing melt blending to obtain the nanocomposites; B, premixing the material a and the material b according to certain parts by mass, performing reactive extrusion to obtain the modified polyester; premixing the modified polyester and the raw material c according to certain parts by mass, and performing the melt blending to obtain the nanocomposites; C, premixing the raw material a and the raw material c according to certain parts by mass, and then performing the melt blending to obtain a master batch of the nanocomposites; premixing the master batch of the nanocomposites, raw material a and raw material b according to certain parts by mass, performing the reactive extrusion to obtain the nanocomposites. The polyester / clay nanocomposites prepared by the method can be directly used in a CO2 foaming process, and no need to further enhance the melt strength.

Description

technical field [0001] The present invention relates to a new type of CO 2 The invention relates to a method for preparing a foamed low-melt strength polyester / clay nanocomposite, in particular to a method for preparing a polyester / clay nanocomposite added with a multifunctional chain extender. Background technique [0002] Foamed plastics are receiving more and more attention and research due to their light weight, heat insulation, impact energy absorption and other properties, and are widely used in packaging, construction, transportation and other fields. Foamed polyester represented by polyethylene terephthalate foam material is usually cheap and has excellent mechanical properties, dimensional stability, chemical corrosion resistance and easy recycling, making it widely used in food packaging, It has great application prospects in automotive interior, aerospace industry and blade core layer of wind power generation. However, commercial polyesters usually exhibit low m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08K9/04C08K3/34C08J9/12B29C47/92B29C48/92
Inventor 赵玲夏天刘涛奚桢浩
Owner EAST CHINA UNIV OF SCI & TECH
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