Polyamide composition and preparation method thereof

A polyamide composition and polyamide technology, which are applied in the field of polymer materials, can solve the problems of large shrinkage, reduced mechanical properties, electrical properties and other properties, and the degree of improvement is not obvious, and achieve excellent mechanical properties and improved dimensional stability. , the effect of reducing water absorption

Active Publication Date: 2020-10-27
CATHAY R&D CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After PA56 absorbs water, its mechanical properties, electrical properties and other properties are significantly reduced, which affects the safety and service life of the product
On the other hand, as a semi-crystalline material, PA56 also has the disadvantage of large shrinkage rate. The shrinkage rate of pure resin is 1.0-1.5%, which is difficult to process into products with high requirements for dimensional stability.
[0004] In order to overcome the above shortcomings, glass fiber reinforcement or mineral filling is currently used to reduce the water absorption of PA56 and improve the dimensional stability, but the degree of improvement is not obvious

Method used

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  • Polyamide composition and preparation method thereof
  • Polyamide composition and preparation method thereof
  • Polyamide composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] This embodiment provides a kind of polyamide composition, and its raw material and corresponding parts by weight are:

[0067]

[0068] Accurately weigh each raw material according to the above parts by weight, and fully stir and mix at room temperature to obtain a premix.

[0069] This premix was melt-kneaded by a twin-screw extruder to obtain a melt-kneaded product. The speed of the main screw of the twin-screw extruder is 400 rpm, the speed of the feeding screw is 20 rpm, and it is divided into seven zones for heating. The temperature of zones 1-7 is set as follows: 230°C, 240°C, 250°C , 260°C, 265°C, 265°C, 260°C, and the die temperature is 260°C.

[0070] The molten kneaded material is extruded from the nozzle into strands, and cooled in water to below the melting point of polyamide. The cooled strands were cut by a pelletizer with a rotating speed of 400 rpm to obtain polyamide composition pellets.

Embodiment 2

[0072] This embodiment provides a polyamide composition, and its raw materials and corresponding parts by weight are as follows. Using the preparation process in Example 1, the following raw materials were processed to obtain polyamide composition pellets.

[0073]

Embodiment 3

[0075] This embodiment provides a polyamide composition, and its raw materials and corresponding parts by weight are as follows. Using the preparation process in Example 1, the following raw materials were processed to obtain polyamide composition pellets.

[0076]

[0077]

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Abstract

The invention provides a polyamide composition and a preparation method thereof. The polyamide composition comprises the following components in parts by weight: 100 parts of polyamide 56, 10-30 partsof long-carbon-chain polyamide and 5-50 parts of an auxiliary agent, wherein the long-carbon-chain polyamide is polyamide of which the methylene number between adjacent amide groups on a main chain is greater than or equal to 10; and the auxiliary agent at least comprises a mineral filler. The polyamide composition provided by the invention has the advantages of low water absorption, high dimensional stability, high tensile strength and high impact strength through reasonable configuration of the components.

Description

technical field [0001] The invention relates to a polyamide composition and a preparation method thereof, in particular to a polyamide composition with low water absorption and high dimensional stability and a preparation process thereof, belonging to the technical field of polymer materials. Background technique [0002] Polyamide (Polyamide, PA) is a general term for polymers containing amide groups in the repeating unit of the macromolecular main chain, commonly known as nylon (Nylon). Due to its excellent comprehensive performance, polyamide ranks first in the world's top five engineering plastics, and is also the world's second largest fiber material after polyester fiber (polyester). [0003] Polyamide 56 (full name is polypentamethylene adipamide, referred to as PA56) has excellent rigidity and toughness, as well as good wear resistance, creep resistance and oil resistance. However, due to the presence of high-density hydrophilic amide groups (-NHCO-), PA56 has a str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08L91/06C08K13/02C08K3/34C08K5/20
CPCC08L77/06C08L2205/025C08L2205/03C08L91/06C08K13/02C08K3/34C08K5/20
Inventor 李玉增高伯爵陈万钟刘修才
Owner CATHAY R&D CENT CO LTD
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