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Low water absorption polyamide composite and preparation method thereof

A technology of polyamide composition and low water absorption, which is applied in the field of composition and its preparation, can solve problems such as mechanical property research, product surface roughness, material toughness decline, etc., and achieve accelerated crystallization speed, low water absorption, and increased crystallinity Effect

Active Publication Date: 2010-07-28
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, the inventor obtained a nylon composition with a shrinkage rate of less than 0.5% by preparing talcum powder filling, but the inventor did not have any specific requirements for the material. Research on mechanical properties; in JP 150275 / 01, the inventors selected matrix resin and added glass fiber reinforcement to semi-aromatic and aliphatic polyamide blends to obtain high dimensional stability, solvent resistance and resistance. Polyamide composition with excellent steam performance, also due to the addition of glass fiber up to 50%, the toughness of the material is significantly reduced

Method used

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  • Low water absorption polyamide composite and preparation method thereof
  • Low water absorption polyamide composite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Select polyamide based on nylon 6 (PA6) from Ube, Japan, with a melting point of 225-230°C, an intrinsic viscosity of 2.52g / dL, and a water absorption rate of 1.8 (23°C, 50%RH) and 10.7 (23°C, 100%RH) , molding shrinkage rate 1.8%; styrene-butadiene-acrylonitrile (ABS), commercially available Korea Kumho ABS750, melt index 42g / 10min, glue content 15%; high rubber powder, glue content 60%, melt index 18g / 10min; commercially available compatibilizer SMA, the content of maleic anhydride (MAH) is 18%; layered silicate clay-nanometer montmorillonite, modified by 16-aminohexadecanoic acid ammonium salt, particle size is 2500 mesh, the antioxidant adopts commercially available antioxidant Irganox168 and antioxidant Irganox1010, refined by Ciba Company, and the lubricant adopts diethylene stearamide (EBS).

[0043] A low water absorption polyamide composition was prepared using a two-step process:

[0044] (1) 90kg of PA6 polyamide, 8kg of 16-aminohexadecanoic acid ammonium s...

Embodiment 2

[0060] A preparation method of polyamide composition with low water absorption rate, the method comprises the following steps:

[0061] (1) 40kg of PA46, the melting point is 225-230°C, the intrinsic viscosity is 1.5g / dL, the water absorption rate is 1.8 (23°C, 50%RH) and 10.7 (23°C, 100%RH), and the mold shrinkage rate is 1.8%. , 3kg of 16-aminohexadecanoic acid ammonium salt intercalated modified talcum powder, the particle size is 1000 mesh, 0.5kg of antioxidant Irganox168, 0.5kg of silicone oil is added as an additive in a high-speed mixer and premixed for 20min, the temperature Control the temperature at 40°C, then blend and granulate the above materials through a twin-screw extruder, control the temperature at 200°C, and control the speed of the extruder at 300rpm, and cool and granulate through conveying, melting, shearing extrusion to obtain PA / Talc masterbatch;

[0062] (2) PA / talcum powder 60kg (comprising 40kg of PA66 and 3kg of talcum powder), 60kg of acrylonitri...

Embodiment 3

[0064] A preparation method of polyamide composition with low water absorption rate, the method comprises the following steps:

[0065] (1) 90kg of PA6, with a melting point of 225-230°C, an intrinsic viscosity of 1.5g / dL, 10kg of nano-montmorillonite of 18-aminohexadecanoic acid ammonium salt, a particle size of 1500 mesh, and 0.5kg of anti- Oxygen agent Irganox 1010 and 0.5 kg of barium stearate were added as additives into a high-speed mixer for premixing for 20 minutes, and the temperature was controlled at 60°C. The rotation speed of the machine is controlled at 300rpm, and the PA / montmorillonite masterbatch is obtained by conveying, melting, shearing, extrusion, cooling and granulation;

[0066] (2) PA / nanometer montmorillonite 100kg (comprising 90kg of PA6 and 10kg of nano-montmorillonite), 10kg of acrylonitrile-styrene-butadiene copolymer obtained through the above steps, the melt index is 60g / 10min, 10kg of compatibilizer, glycidyl methacrylate graft rate of 6% and ...

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Abstract

The invention relates to a low water absorption polyamide composite and preparation method thereof. 10-90 parts by weight of polyamide and 3-10 parts by weight of phyllo-silicate clay and less than 2 parts by weight of additive are placed into a high speed mixer to be premixed for 20min and then are added into a double screw extrusion machine, and conveying, melting, cutting, extrusion, cooling and granulation are carried out, thus obtaining polyamide / phyllo-silicate master batch, then the polyamide / phyllo-silicate master batch, 10-60 parts by weight of styrene resin, 2-10 parts by weight of compatilizer and 5-20 parts by weight of short glass fiber are placed into the high speed mixer to be premixed for 20min, temperature is controlled to be 40-60 DEG C, and finally extrusion granulationis carried out in the double screw extrusion machine, thus obtaining the low water absorption polyamide composite. Compared with prior art, the invention has the advantages of solvent resistance, high tenacity and easy processability of polyamide and the advantage of low water absorption of ABS resin; besides, phyllo-silicate clay speeds up crystallization of nylon, degree of crystallization and mechanical strength are improved, extremely low water absorption is obtained, and size stability is greatly improved while impact toughness is maintained.

Description

technical field [0001] The invention relates to a composition and a preparation method thereof, in particular to a low water absorption polyamide composition and a preparation method thereof. Background technique [0002] Polyamide (usually 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 low melt viscosity. 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] Methods for imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08L77/02C08L77/06C08L55/02C08L51/06C08K13/06C08K3/34C08K7/14
Inventor 宋治乾丁宗勤李荣群辛敏琦
Owner SHANGHAI KUMHO SUNNY PLASTICS
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