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Polyamide composition with high dimensional stability and preparation method thereof

A technology of polyamide composition and dimensional stability, which is applied in the field of polyamide composition with high dimensional stability and its preparation, can solve the problems of material toughness reduction, product surface roughness, mechanical performance research, etc., and achieve reduction of molding shrinkage , lower water absorption, high toughness effect

Inactive Publication Date: 2010-10-13
SHANGHAI KUMHO SUNNY PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In European patent 07002642.2, the inventor reduced the water absorption of nylon to less than 1% by filling PA with chopped or annular fibers. However, since the fiber addition amount was 30% to 50%, the water absorption was greatly reduced while improving the water absorption. The toughness of the material, and the surface of the product is rough and the gloss is poor, which limits the scope of use; in the Chinese patent CN101314674A, a nylon composition with a shrinkage rate of less than 0.5% is obtained by preparing talcum powder filling, but the mechanical properties of the material are not studied ; In JP 150275 / 01, a polyamide with high dimensional stability, solvent resistance and steam resistance was obtained by selecting the matrix resin and adding glass fiber reinforcement to the semi-aromatic and aliphatic polyamide blend Composition, also due to the addition of glass fiber up to 50%, the toughness of the material drops significantly

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment

[0038] Specific embodiment preparation method:

[0039] Performance Evaluation Methods and Standards

[0040] The polyamide composition particles obtained above were dried at 90°C for 2 hours, and various test specimens were injection molded at 230°C, and evaluated according to the following standards and methods:

[0041] Tensile strength: ASTM D638, spline size 127*12.7*3.2mm, tensile speed 50mm / min;

[0042] Heat distortion temperature: ASTM D648, spline size 127*12.7*6.4mm, load 0.45MPa;

[0043] Shrinkage rate: ASTM D955, the diameter of the disc is 100mm, the thickness is 3mm, and the diameter Φ is tested after conditioning at 23°C for 48h 1 , and calculate the shrinkage rate S according to formula 1 1 ;Stat at 80°C for 48h, then test Φ after conditioning for 3h at 23°C / 50%RH 2, and calculate the shrinkage rate S according to formula 2 2 ;

[0044] S 1 =(Φ 0 -Φ 1 ) / Φ 0 ×100%

[0045] S 2 =(Φ 1 -Φ 2 ) / Φ 1 ×100%

[0046] Among them, Φ 0 Be the die diamet...

Embodiment 1

[0049] Add 60phr of PA6-1013B, 11phr of ABS, 22phr of high rubber powder, 5phr of SMA, 2phr of anhydrous calcium chloride, 0.6% of antioxidant (168+1010) and 1.0% of lubricant EBS and add high speed After pre-mixing in the mixer, it is blended and granulated by a twin-screw extruder, the temperature is controlled at 200-230°C, and the rotation speed is 200rpm / min.

Embodiment 2

[0051] Add 58phr of PA6-1013B, 11phr of ABS, 22phr of high rubber powder, 5phr of SMA, 4phr of anhydrous calcium chloride, 0.6% of antioxidant (168+1010) and 1.0% of lubricant EBS and add high speed After pre-mixing in the mixer, it is blended and granulated by a twin-screw extruder, the temperature is controlled at 200-230°C, and the speed is 200rpm / min;

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Abstract

The invention relates to a polyamide composition with high dimensional stability and a preparation method thereof. The polyamide composition comprises the following components in parts by weight: 60 to 90 of fatty polyamide composition, 2 to 10 of compatilizer, 1 to 10 of inorganic metal compound, 0 to 5 of polysiloxane with low molecular weight and 0 to 2 of auxiliary agent. The preparation method comprises the following steps of: premixing the raw materials in a high-speed mixer for 10 to 30min, controlling the temperature to be 40 to 60 DEG C, then adding premix into a double-screw extruder, conveying, melting, shearing, extruding, cooling and granulating so as to prepare a polyamide composition product with high dimensional stability. Compared with the prior art, the invention shows excellent dimensional stability and heat distortion temperature with high retention rate, is suitable for occasions with higher requirement to the dimensional stability, such as the panel of the air conditioner of an automobile, an instrument panel, a camera bracket, a sports apparatus and the like, and can be directly processed by injection molding or other forming methods.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyamide composition with high dimensional stability and a preparation method thereof. Background technique [0002] Polyamide (commonly known as nylon, abbreviated as PA) is the base resin with the largest output, the most variety, the widest range of uses, and excellent comprehensive performance among the five general-purpose engineering plastics. It has high strength, high toughness, solvent resistance, and melt viscosity. Low and excellent wear resistance, self-lubricating properties, [0003] Polyamide contains polar -NH-CO- bonds in the macromolecular chain, which is easy to form hydrogen bonds with water molecules, which leads to high water absorption of PA and poor dimensional stability of products. Extensive research has been done on the water absorption of nylon in the literature and patents, and effective improvement methods have been proposed. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08K3/24C08L83/04
Inventor 宋治乾周霆丁宗勤李荣群辛敏琦
Owner SHANGHAI KUMHO SUNNY PLASTICS
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