Preparation method of high-strength and high-toughness polyamide/polyester alloy

A technology of polyester alloy and polyamide, which is applied in the field of preparation of high-strength and high-toughness polyamide/polyester alloy, can solve the problems of poor application of precision mechanical parts, insufficient tensile strength and bending strength, and rough material surface. , to achieve the effect of high toughness, high content of terminal carboxyl groups, and a wide range of sources

Inactive Publication Date: 2013-07-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impact performance of the alloy in patent CN1749314A has reached 60kJ / m2, the tensile strength is 56MPa, and the bending strength is 63 MPa. Although the impact performance has been improved, the tensile strength and bending strength are insufficient, which limits its application fields, such as engine cover
The impact performance of the composite material in patent CN102850781A is 10kJ / m2, the bending strength is 102MPa, and the tensile strength is 99 MPa, but the impact performance is low, and due to the addition of glass fiber, the prepared material The surface is rough and has high hygroscopicity, so it cannot be well applied to precision mechanical parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 100 parts of PET and 1 part of sodium benzoate in a high-speed mixer at 75°C for 5 minutes and put them into a twin-screw extruder to extrude to obtain carboxyl-terminated PET. The screw temperature is 190°C~270°C and the screw speed is 200~400r / min . Add 100 parts of PA6 and 10 parts of PP-g-MAH into a high-speed mixer for mixing, and put the mixture into the high-toughness carboxyl-terminated PA6 extruded by a twin-screw extruder. The screw temperature is 160°C~240°C, and the screw speed is 200~ 400r / min. Take the above-mentioned 60 parts of high-toughness carboxyl-terminated PA6 and 40 parts of carboxyl-terminated PET, 0.5 parts of 1,4-butanediol diglycidyl ether and 5 parts of graphite and add them to a high-speed mixer and heat at 75°C for 10 minutes, and then put the mixture into The twin-screw extruder extrudes and granulates, the screw temperature is 160°C~270°C, and the screw speed is 200~400r / min. The tensile strength of the obtained polyamide / polyester ...

Embodiment 2

[0023] Put 100 parts of PET and 1 part of sodium benzoate in a high-speed mixer at 75°C for 5 minutes and put them into a twin-screw extruder to extrude to obtain carboxyl-terminated PET. The screw temperature is 240-270°C and the screw speed is 200-400r / min. Add 100 parts of PA6 and 5 parts of PP-g-MAH into a high-speed mixer for mixing, and put the mixture into the high-toughness carboxyl-terminated PA6 extruded by a twin-screw extruder. The screw temperature is 160 ° C ~ 240 ° C, and the screw speed is 200 ~400r / min. Take the above-mentioned 60 parts of high-toughness carboxyl-terminated PA6 and 40 parts of carboxyl-terminated PET, 0.5 parts of 1,6-hexanediol diglycidyl ether and 5 parts of talcum powder, add them to a high-speed mixer and heat at 75°C for 10 minutes, and mix the materials Put it into a twin-screw extruder to extrude and granulate, the screw temperature is 160°C~270°C, and the screw speed is 200~400r / min. The tensile strength of the obtained polyamide / poly...

Embodiment 3

[0025] Put 100 parts of PET and 3 parts of sodium benzoate in a high-speed mixer at 75°C for 5 minutes and put them into a twin-screw extruder for extrusion to obtain carboxyl-terminated PET. The screw temperature is 240-270°C and the screw speed is 200-400r / min. Add 100 parts of PA66 and 10 parts of PE-g-MAH into a high-speed mixer for mixing, and put the mixture into a twin-screw extruder to extrude PA66 with high toughness and carboxyl groups. The screw temperature is 160°C~240°C, and the screw speed is 200 ~400r / min. Take the above-mentioned 70 parts of modified PA66 and 30 parts of carboxyl-terminated PET, 0.5 parts of 1,4-butanediol diglycidyl ether and 7.5 parts of talcum powder, add them to a high-speed mixer and heat at 75°C for 10 minutes, and put the mixed materials into the twin-screw The extruder is extruded and granulated, the screw temperature is 160°C~270°C, and the screw speed is 200~400r / min. The tensile strength of the obtained polyamide / polyester alloy is ...

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Abstract

The invention discloses a preparation method of a high-strength and high-toughness polyamide/polyester alloy. The preparation method comprises the following steps of: processing PET (polyethylene Terephthalate) through sodium benzoate to obtain a high terminal carboxyl group PET; processing polyamide through polyolefin grafted maleic anhydride to obtain carboxyl-terminated polyamide; reacting a bifunctional epoxide with the terminal carboxyl group PET and the carboxyl-terminated polyamide to obtain a copolymer of the PET and the polyamide; and carrying out capacity increasing and chain extension on the PET and the polyamide, thus obtaining the high-strength and high-toughness polyamide/polyester alloy. According to the preparation method of the high-strength and high-toughness polyamide/polyester alloy, the polyolefin grafted maleic anhydride is adopted, an anhydride group and the terminal amino group are reacted and grafted at a molten state, and the resulting product which is the terminal carboxyl group has high output, and the toughness of the product is greatly improved due to an introduced graft; the bifunctional epoxide is adopted, thus the copolymer material gains high toughness of modified polyamide, and also gains the mechanical strength which is increased along with the raise of molecular weight; and the preparation method has the advantages that the adopted raw components are wide in resource and low in price, and the industrialization is easily realized accordingly.

Description

technical field [0001] The invention relates to a preparation method of a high-strength and high-toughness polyamide / polyester alloy, which belongs to the technical field of polymer materials. Background technique [0002] As important engineering plastics, polyamide PA6 and polyester PET have obvious advantages and disadvantages. Due to its highly regular structure, high crystallinity and excellent comprehensive mechanical properties, PA6 is widely used in machinery, automobile and other industries. However, it has disadvantages such as poor dimensional stability, high water absorption, and high price. PET has a highly symmetrical structure, good weather resistance and dimensional stability, good film-forming properties and low price. However, the most engineering plastics have disadvantages such as high glass transition temperature, slow crystallization speed at normal processing mold temperature, long molding cycle, rough surface, easy deformation, brittle injection mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08L67/02C08L51/06C08K5/098C08K5/1515C08K3/34C08K3/04C08K3/30B29C47/92B29C48/92
Inventor 徐卫兵李小宝周正发任凤梅马海红
Owner HEFEI UNIV OF TECH
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