Mica-reinforced polypropylene composite material and preparation method thereof

Abstract

The invention discloses a mica-reinforced polypropylene composite material and a preparation method thereof. The mica-reinforced polypropylene composite material comprises the following components in percentage by weight: 50%-85% of polypropylene, 10%-40% of mica powder and 5%-10% of auxiliaries. The preparation method comprises the steps of: mixing propylene, mica powder and auxiliaries for three to ten minutes in a plastic tube, then pouring in a double-screw extruder, and extruding into a strip-shaped primary material under the conditions of the temperature of 200-260DEG C and rotating speed of 330-430 turns / minute; performing water tank and water cooling and then dicing into plastic particles. The mica-reinforced polypropylene composite material and the preparation method thereof have the beneficial effects that the rigidity and temperature resistance indexes of the material are improved but the electricity property and other physical performance indexes of the material cannot be reduced. The mica-reinforced polypropylene composite material is lighter in specific weight and the weight of plastic parts can be reduced. The mica-reinforced polypropylene composite material can replace a part of higher-cost plastic materials (such as reinforced nylon materials) so as to achieve the effect of lowering the cost. In addition, the mica-reinforced polypropylene composite material is easily machined into various plastic parts. The preparation method is simple, the process is easy to control and in the yield is high.

Description

technical field

[0001] The invention belongs to the technical field of composite materials, and in particular relates to a mica-reinforced polypropylene composite material and a preparation method thereof. Background technique

[0002] Generally, glass fiber reinforced polypropylene composite materials have high rigidity and heat resistance, but on the one hand, because the length of glass fiber distributed in polypropylene resin is much larger than the diameter of glass fiber, in thinner product parts, The orientation of glass fibers can easily lead to product warping; on the other hand, polypropylene is a crystalline polymer, and the size of polypropylene spherulites and the crystallization cycle directly affect the degree of warping of glass fiber reinforced polypropylene products

[0003] In the existing similar products, there are generally the following disadvantages: insufficient rigidity index, low thermal deformation temperature, and general electrical insulation pe...

Examples

Embodiment 1

[0058] 1) Take 10kg of copolymerized polypropylene, 40kg of homopolypropylene, 40kg of mica powder, 9.5kg of compatibilizer and 0.5kg of antioxidant in a plastic cylinder and mix for 3 minutes, stirring and mixing evenly;

[0059] 2) Take out the raw material mixed in the above step 1), pour it into the feed port of the twin-screw extruder, extrude it at a temperature of 200°C and a speed of 330 rpm, and extrude it into a strip-shaped raw material ;

[0060] 3) The primary material obtained in the above step 2) is cooled in a water tank and in the air, and then cut into plastic particles by a pelletizer to obtain a mica-reinforced polypropylene composite material.

[0061] The color of the mica-reinforced polypropylene composite material obtained in the above step 3) is white or black.

Embodiment 2

[0063] 1) Mix 20kg of polypropylene copolymer, 65kg of homopolypropylene, 10kg of mica powder, 4.7kg of compatibilizer and 0.3kg of antioxidant in a plastic cylinder for 5 minutes, and mix well;

[0064] 2) Take out the raw materials mixed in the above step 1), pour them into the feed port of the twin-screw extruder, extrude them at a temperature of 220°C and a speed of 350 rpm, and extrude them into strip-shaped raw materials ;

[0065] 3) The primary material obtained in the above step 2) is cooled in a water tank and in the air, and then cut into plastic particles by a pelletizer to obtain a mica-reinforced polypropylene composite material.

[0066] The color of the mica-reinforced polypropylene composite material obtained in the above step 3) is white or black.

Embodiment 3

[0068] 1) Mix 15kg of polypropylene copolymer, 52.5kg of homopolypropylene, 25kg of mica powder, 7.1kg of compatibilizer and 0.4kg of antioxidant in a plastic cylinder for 7 minutes, and mix well;

[0069]2) Take out the raw materials mixed in the above step 1), pour them into the feed port of the twin-screw extruder, extrude them at a temperature of 240°C and a speed of 410 rpm, and extrude them into strip-shaped raw materials ;

[0070] 3) The primary material obtained in the above step 2) is cooled in a water tank and in the air, and then cut into plastic particles by a pelletizer to obtain a mica-reinforced polypropylene composite material.

[0071] The color of the mica-reinforced polypropylene composite material obtained in the above step 3) is white or black.

technical field

[0001] The invention belongs to the technical field of composite materials, and in particular relates to a mica-reinforced polypropylene composite material and a preparation method thereof. Background technique

[0002] Generally, glass fiber reinforced polypropylene composite materials have high rigidity and heat resistance, but on the one hand, because the length of glass fiber distributed in polypropylene resin is much larger than the diameter of glass fiber, in thinner product parts, The orientation of glass fibers can easily lead to product warping; on the other hand, polypropylene is a crystalline polymer, and the size of polypropylene spherulites and the crystallization cycle directly affect the degree of warping of glass fiber reinforced polypropylene products

[0003] In the existing similar products, there are generally the following disadvantages: insufficient rigidity index, low thermal deformation temperature, and general electrical insulation pe...

Examples

Embodiment 1

[0058] 1) Take 10kg of copolymerized polypropylene, 40kg of homopolypropylene, 40kg of mica powder, 9.5kg of compatibilizer and 0.5kg of antioxidant in a plastic cylinder and mix for 3 minutes, stirring and mixing evenly;

[0059] 2) Take out the raw material mixed in the above step 1), pour it into the feed port of the twin-screw extruder, extrude it at a temperature of 200°C and a speed of 330 rpm, and extrude it into a strip-shaped raw material ;

[0060] 3) The primary material obtained in the above step 2) is cooled in a water tank and in the air, and then cut into plastic particles by a pelletizer to obtain a mica-reinforced polypropylene composite material.

[0061] The color of the mica-reinforced polypropylene composite material obtained in the above step 3) is white or black.

Embodiment 2

[0063] 1) Mix 20kg of polypropylene copolymer, 65kg of homopolypropylene, 10kg of mica powder, 4.7kg of compatibilizer and 0.3kg of antioxidant in a plastic cylinder for 5 minutes, and mix well;

[0064] 2) Take out the raw materials mixed in the above step 1), pour them into the feed port of the twin-screw extruder, extrude them at a temperature of 220°C and a speed of 350 rpm, and extrude them into strip-shaped raw materials ;

[0065] 3) The primary material obtained in the above step 2) is cooled in a water tank and in the air, and then cut into plastic particles by a pelletizer to obtain a mica-reinforced polypropylene composite material.

[0066] The color of the mica-reinforced polypropylene composite material obtained in the above step 3) is white or black.

Embodiment 3

[0068] 1) Mix 15kg of polypropylene copolymer, 52.5kg of homopolypropylene, 25kg of mica powder, 7.1kg of compatibilizer and 0.4kg of antioxidant in a plastic cylinder for 7 minutes, and mix well;

[0069]2) Take out the raw materials mixed in the above step 1), pour them into the feed port of the twin-screw extruder, extrude them at a temperature of 240°C and a speed of 410 rpm, and extrude them into strip-shaped raw materials ;

[0070] 3) The primary material obtained in the above step 2) is cooled in a water tank and in the air, and then cut into plastic particles by a pelletizer to obtain a mica-reinforced polypropylene composite material.

[0071] The color of the mica-reinforced polypropylene composite material obtained in the above step 3) is white or black.

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