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Modified polyamide-6 microcellular foam material and preparation method thereof

A microcellular foaming material, polyamide technology, applied in the field of materials, can solve problems such as low melt strength and difficulty in preparing microcellular foamed plastics, and achieve the effect of high pore density, small pore size, and wide application prospects

Active Publication Date: 2016-05-25
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the existing polyamide-6 is difficult to prepare microcellular foamed plastics due to its low melt strength, and to provide a modified polyamide-6 microcellular foamed material and its preparation method

Method used

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  • Modified polyamide-6 microcellular foam material and preparation method thereof
  • Modified polyamide-6 microcellular foam material and preparation method thereof
  • Modified polyamide-6 microcellular foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Commercial polyamide-6, chain extender 2,2'-bis(2-oxazoline) and antioxidant 1010 were dried in vacuum at 85°C for 12 hours, and fully premixed in the following mass parts:

[0050] Polyamide-6100 parts

[0051] 0.883 parts of chain extender

[0052] Antioxidant 0.5 parts

[0053] The premixed materials are melt blended by Haake torque rheometer to prepare modified polyamide-6 materials. The rotor speed of the Haake torque rheometer is 50 revolutions per minute, and the melting temperature is 240°C. The extrudate is pelletized and dried to obtain a modified polyamide-6 base material for subsequent analysis and foaming.

[0054] Place the dried modified polyamide-6 base material in an autoclave and seal it, where the volume of the modified polyamide-6 base material is not more than one percent of the volume of the autoclave to ensure sufficient foaming Space foam molding. Then use low pressure CO 2 Purge the autoclave 3 times to replace the air in the autoclave, heat the autoc...

Embodiment 2

[0056] Commercial polyamide-6, chain extender 2,2'-bis(2-oxazoline), isophthaloyl dicaprolactam and antioxidant 1010 were dried under vacuum at 85°C for 12 hours, and then dried as follows The mass parts are fully premixed.

[0057]

[0058] The premixed materials are melt blended by Haake torque rheometer to prepare modified polyamide-6 materials. The rotor speed of the Haake torque rheometer is 50 revolutions per minute, and the melting temperature is 240°C. The extrudate is pelletized and dried to obtain an improved base material for subsequent analysis and foaming.

[0059] Place the dried modified polyamide-6 base material in an autoclave and seal it, where the volume of the modified polyamide-6 base material is not more than one percent of the volume of the autoclave to ensure sufficient foaming Space foam molding. Then use low pressure CO 2 Purge the autoclave 3 times to replace the air in the autoclave, heat the autoclave to 235℃, increase the pressure to 25MPa, and swel...

Embodiment 3

[0061] Commercial polyamide-6, chain extender KL-E4370 and antioxidant 1010 were vacuum dried at 85°C for 12 hours and fully premixed in the following mass parts.

[0062] Polyamide-6100 parts

[0063] 5 parts of chain extender

[0064] Antioxidant 0.6 parts

[0065] The premixed materials are melt blended by Haake torque rheometer to prepare modified polyamide-6 materials. The rotor speed of the Haake torque rheometer is 50 revolutions per minute, and the melting temperature is 240°C. The extrudate is pelletized and dried to obtain a modified base material for subsequent analysis and foaming.

[0066] Place the dried modified polyamide-6 base material in an autoclave and seal it, where the volume of the modified polyamide-6 base material is not more than one percent of the volume of the autoclave to ensure sufficient foaming Space foam molding. Then use low pressure CO 2 Purge the autoclave 3 times to replace the air in the autoclave, raise the temperature of the autoclave to 240℃,...

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Abstract

The invention discloses a modified polyamide-6 microcellular foam material and a preparation method thereof. The preparation method of the modified polyamide-6 microcellular foam material includes the steps of (1), premixing polyamide-6, a chain extender and an antioxidant so as to obtain a premixed material; (2), subjecting the premixed material to melt blending, extrusion pelletization and drying so as to obtain a modified base material; (3), placing the modified base material in supercritical CO2 to be subjected to swelling and osmosis at a T1 temperature, decreasing the temperature to a foaming temperature T2, holding, relieving pressure to normal pressure and cooling so as to obtain the modified polyamide-6 microcellular foam material, wherein T1 ranges from 230 DEG C to 250 DEG C, and T2 ranges from 205 DEG C to 225 DEG C. The prepared modified polyamide-6 microcellular foam material is small in aperture size and large in cell density, the expanded volume of the modified polyamide-6 microcellular foam material is 3.0-20 times of the volume of raw materials, the melt strength of the modified base material is high, and accordingly the modified polyamide-6 microcellular foam material has promising application prospect in the field of automobile materials.

Description

Technical field [0001] The invention relates to the field of materials, in particular to a modified polyamide-6 material and a preparation method thereof. Background technique [0002] Polyamide (PA), commonly known as nylon, not only has excellent mechanical properties and good electrical properties, but also has a series of excellent properties such as wear resistance, solvent resistance, corrosion resistance, and oil resistance. It has now developed into the five major engineering plastics The polymer material with the largest output, the most versatile and the most products, and polyamide-6 (PA6) as the most important variety is widely used in automobiles, machinery, chemicals, electrical appliances, construction, packaging and other fields. Automobile is an important and fast-growing market for plastics, and it is also the largest application market for polyamide-6. Today's lightweight is an inevitable trend in the development of the automotive industry, and the lightweight ...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L77/02C08G69/48C08K5/134
CPCC08G69/48C08J9/122C08J2203/06C08J2203/08C08J2205/044C08J2377/02C08K5/1345C08L2203/14C08L77/02
Inventor 刘涛闫海超赵玲万辰徐梦龙
Owner EAST CHINA UNIV OF SCI & TECH
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