High-fluidity polyamide magnetic composite material and preparation method thereof

A technology of fluid polyamide and magnetic composite materials, which is applied in the field of polymer materials, can solve the problems of decreased mechanical properties, poor secondary processability of materials, and small improvement in fluidity, so as to improve fluidity and magnetic properties, The effect of better magnetic performance and better magnetic performance

Inactive Publication Date: 2016-09-21
SICHUAN UNFIRE POLYMER MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The bonded magnet is a thermoplastic resin binder-polymer uniformly coated magnetic powder composite material, in which the magnetic powder is added in an amount of 80%-94% (mass percentage), and the melt of the composite material is a solid phase with a very high solid filling amount Suspension system, compared with pure polymer or filled polymer system, the melt flow performance of bonded magnets is very poor, which greatly weakens the processing performance and magnetic properties of injection-molded magnets. "Technical bottleneck" in magnets
[0004] The prior art for improving the fluidity of polyamide resin-ferrite composites is as follows: Patent US5028347A discloses the use of N-butylbenzenesulfonamide (N-BBSA) as the internal lubrication of nylon (PA) 6/strontium ferrite system Additives can improve the fluidity of magnetic composite materials, but the initial decomposition temperature of N-BBSA is about 170°C, which is far lower than the processing temperature of the magnetic composite material at 230-280°C. At this temperature, N-BBSA has decomposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1 Preparation of high fluidity polyamide magnetic composite material of the present invention

[0062] The preparation method of described high fluidity polyamide magnetic composite material comprises the following steps:

[0063] (1) Mix 2550g of strontium ferrite with a particle size of 1.4μm and 15g of coupling agent KH550 in a high-speed mixer for 30min, then add 303g of PA6 resin, 30g of internal lubricant A55, and 90g of flow modification The external lubricant zinc stearate of agent TP003,6g, the main antioxidant 1098 of 3g, the auxiliary antioxidant 168 of 3g, then mix 30min, obtain compound;

[0064] (2) Add the compound that step (1) obtains from the main feeding port of twin-screw extruder (screw diameter 35mm, length-to-diameter ratio 44), mix uniformly in twin-screw extruder, then extrude pelletizing to obtain high Fluid polyamide magnetic composite material pellets; the processing conditions of the extruder are as follows: the rotation speed of...

Embodiment 2

[0066] Embodiment 2 Preparation of high fluidity polyamide magnetic composite material of the present invention

[0067] The preparation method of described high fluidity polyamide magnetic composite material comprises the following steps:

[0068] (1) Mix 2670g of strontium ferrite with a particle size of 1.4μm and 16.5g of coupling agent KH550 in a high-speed mixer with a speed of 800r / min for 30min, then add 181.5g of PA6 1011FB resin and 30g of internal lubrication The flow modifier TP003 of agent A55,90g, the external lubricant zinc stearate of 6g, the main antioxidant 1098 of 3g, the auxiliary antioxidant 168 of 3g, mix 30min then, obtain compound;

[0069] (2) Add the compound that step (1) obtains from the main feeding port of twin-screw extruder (screw diameter 35mm, length-to-diameter ratio 44), mix uniformly in twin-screw extruder, then extrude pelletizing to obtain high Fluid polyamide magnetic composite material pellets; the processing conditions of the extruder ...

Embodiment 3

[0071] Embodiment 3 Preparation of high fluidity polyamide magnetic composite material of the present invention

[0072] The preparation method of described high fluidity polyamide magnetic composite material comprises the following steps:

[0073] (1) Mix 2790g of strontium ferrite with a particle size of 1.8μm and 24g of coupling agent KH550 (produced by Nanjing Shuguang) in a high-speed mixer with a rotation speed of 800r / min for 30min, then add 129g of PA6 resin, 15g of Internal lubricant A55, 30g of flow modifier TP003, 6g of external lubricant zinc stearate, 3g of primary antioxidant 1098, 3g of auxiliary antioxidant 168, then mixed for 30min to obtain a mixture;

[0074] (2) Add the compound that step (1) obtains from the main feeding port of twin-screw extruder (screw diameter 35mm, length-to-diameter ratio 44), mix uniformly in twin-screw extruder, then extrude pelletizing to obtain high Fluid polyamide magnetic composite material pellets; the processing conditions o...

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Abstract

The invention discloses a high-fluidity polyamide magnetic composite material, prepared from the following ingredients in percentage by weight: 4.3-12.2wt% of polyamide resin, 85-93wt% of strontium ferrite, 0.5-1wt% of an internal lubricant, 1-3wt% of a flow modifier, 0-0.2wt% of an external lubricant, 0-0.1wt% of a primary antioxygen, 0-0.1wt% of an auxiliary antioxygen and 0.3-0.8wt% of a coupling agent. A a sa a preparation method comprises the following steps: (1) mixing the strontium ferrite with the coupling agent, then adding the polyamide resin, the internal lubricant, the flow modifier, the external lubricant, the primary antioxygen and the auxiliary antioxygen, and mixing to obtain a mixture; (2) adding the mixture through a main feeding hole of a double-screw extruder, mixing uniformly, then extruding, and granulating by virtue of a granulator, thereby obtaining the high-fluidity polyamide magnetic composite material.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high fluidity polyamide magnetic composite material and a preparation method thereof. Background technique [0002] Magnetic materials usually refer to a class of materials with available magnetic properties. The largest and most widely used magnetic materials are hard magnetic materials and soft magnetic materials. The difference lies in the level of coercive force. Hard magnetic materials, also known as permanent magnetic materials, are mainly divided into casting molding, sintering molding and bonding molding according to manufacturing technology. Among them, the bonded permanent magnet is better than the non-magnetic phase (binder) part, but its magnetic performance is lower than that of the corresponding sintered or cast permanent magnet. However, the bonded permanent magnet market is the fastest growing permanent magnet market in recent years. . Bo...

Claims

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Application Information

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IPC IPC(8): C08L77/02C08L67/00C08K13/02C08K3/22C08K5/098C08K5/20C08K5/526
CPCC08L77/02C08K2201/003C08K2201/01C08L2205/025C08L2205/03C08L67/00C08K13/06C08K9/06C08K3/22C08K5/098C08K5/20C08K5/526
Inventor 王冲刘举刘鹏清付登强杨华侨李亚儒宋长洪
Owner SICHUAN UNFIRE POLYMER MATERIALS TECH
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