Polyamide composition with high dimensional stability and preparation method thereof

A polyamide composition and dimensional stability technology are applied in the field of polyamide compositions with high dimensional stability and their preparation, which can solve the problems of decreased material toughness, rough surface of products, research on mechanical properties, etc., and reduce the molding shrinkage rate. , The effect of reducing water absorption and high toughness

Inactive Publication Date: 2012-05-30
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 2h, and injection-molded with various test specimens 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] Thermal deformation 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 is Φ after being adjusted for 48h at 23℃ 1 , and calculate the shrinkage S according to formula 1 1 ; Test Φ after placing at 80°C for 48h and adjusting 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] where Φ 0 is the diameter of the wafer die, Φ ...

Embodiment 1

[0049] Add 60phr PA6-1013B, 11phr ABS, 22phr high rubber powder, 5phr SMA, 2phr anhydrous calcium chloride, 0.6% antioxidant (168+1010) and 1.0% lubricant EBS and add high speed After the mixer is premixed, the twin-screw extruder is used for blending and granulation.

Embodiment 2

[0051] Add 58phr PA6-1013B, 11phr ABS, 22phr high rubber powder, 5phr SMA, 4phr anhydrous calcium chloride, 0.6% antioxidant (168+1010) and 1.0% lubricant EBS and add high speed After the mixer is premixed, it is mixed and granulated by a twin-screw extruder.

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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 (usually called nylon, abbreviated as PA) is the base resin with the largest output, the most varieties, the most widely used and the excellent comprehensive performance among the five general 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 nylon's water absorption literature and patents, and effective improvement methods have been proposed. [0004] Methods for improving t...

Claims

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Application Information

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Patent Type & Authority Patents(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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