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Low-flow-mark low-weld-mark polypropylene composition and preparation method thereof

A polypropylene composition and welding line technology, applied in the field of polypropylene composition, can solve the problems of bimodal polypropylene welding lines, low melt flow rate of polypropylene composition, poor processing performance, etc., and achieve low welding line, The effect of improving melt flow and reducing flow differences

Active Publication Date: 2015-01-21
GUANGDONG SILVER AGE SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the very high viscosity of ethylene propylene rubber results in very low melt flow rate and poor processability of polypropylene compositions
Also, bimodal polypropylene can still cause severe weld lines

Method used

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  • Low-flow-mark low-weld-mark polypropylene composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take by weighing 1.5wt% polypropylene A, 8.5wt% polypropylene B, 48.7wt% polypropylene C, 10wt% hyperbranched polyethylene A, 20wt% ethylene and α - Olefin copolymer A, 10% talc, 0.2wt% primary antioxidant DSTP, 0.2wt% secondary antioxidant 168, 0.2wt% light stabilizer 770, 0.2wt% light stabilizer 944 and 0.5 wt% of the pigment was mixed in a high-speed mixer for 3 minutes at a speed of 1000 rpm, and then the mixture was added to a twin-screw extruder for melting and mixing, and extruded to granulate. The process is: 190°C in the first zone, 210°C in the second zone, 220°C in the third zone, and 205°C in the fourth zone; the residence time of the entire extrusion process is 1 minute, and the pressure is 15MPa.

Embodiment 2

[0043] Take by weighing 4wt% polypropylene A, 3wt% polypropylene B, 61.7wt% polypropylene C, 10wt% hyperbranched polyethylene A, 10wt% ethylene and α - Olefin copolymer A, 10 wt% inorganic filler, 0.2 wt% primary antioxidant DSTP, 0.2 wt% secondary antioxidant 168, 0.4 wt% light stabilizer 770 and 0.5 wt% pigments were put into high speed Blending in the mixer for 4 minutes, the rotation speed is 1000 rpm, and then the mixture is added to a twin-screw extruder for melting and kneading, and extruded to granulate. The process is as follows: the first zone is 200°C, the second zone is 200°C, the third zone is 210°C, and the fourth zone is 215°C; the residence time of the entire extrusion process is 2 minutes, and the pressure is 19MPa.

Embodiment 3

[0045] Take by weighing 3wt% polypropylene A, 6wt% polypropylene B, 44.6wt% polypropylene C, 20wt% hyperbranched polyethylene A, 5wt% ethylene and α - Olefin copolymer A, 20wt% inorganic filler, 0.1wt% primary antioxidant 1010, 0.1wt% secondary antioxidant 618, 0.1wt% light stabilizer 770, 0.1wt% light stabilizer 944 and 1wt% of the pigment was mixed in a high-speed mixer for 5 minutes at a speed of 1000 rpm, then the mixture was added to a twin-screw extruder for melting and mixing, and extruded to granulate. The process is as follows: the first zone is 200°C, the second zone is 205°C, the third zone is 215°C, and the fourth zone is 210°C; the residence time of the entire extrusion process is 2 minutes, and the pressure is 13MPa.

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Abstract

The invention relates to the technical field of polypropylene compositions, particularly a low-flow-mark low-weld-mark polypropylene composition and a preparation method thereof. The low-flow-mark low-weld-mark polypropylene composition is prepared from the following raw materials in percentage by weight: 55-70% of polypropylene, 10-20% of hyperbranched polyethylene, 5-20% of ethylene-alpha-olefin copolymer, 10-20% of inorganic filler, 0.2-0.4% of antioxidant, 0.2-0.4% of light stabilizer and 0.5-1% of other additives, totaling 100%. The low-flow-mark low-weld-mark polypropylene composition has the advantages of low density, favorable flowability, low flow mark, low weld mark, favorable shock resistance and the like. The preparation method comprises the following steps: mixing the raw materials according to parts by weight in a high-speed stirrer, putting the mixed raw materials in a double screw machine, and carrying out melt extrusion and granulation. The preparation method has the advantages of simple steps and favorable preparation effect, and is easy to operate.

Description

technical field [0001] The invention relates to the technical field of polypropylene compositions, in particular to a polypropylene composition with low flow marks and low weld marks and a preparation method thereof. Background technique [0002] Polypropylene material has the disadvantages of high shrinkage, easy warping, low strength and poor low temperature toughness. In many fields, it is necessary to form a composition of elastomer (rubber), inorganic filler, etc. and polypropylene resin to improve the above defects. The polypropylene composition has the characteristics of low density, corrosion resistance, good mechanical properties, excellent processability, low price and easy recycling, etc., and has been widely used in automotive materials, household appliances, film packaging and other fields. However, the polypropylene composition is prone to apparent defects such as flow marks and weld marks during the injection molding process. Flow mark refers to the light an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L23/06C08L23/08C08K13/02C08K3/34C08F110/02C08F4/80
CPCC08F4/80C08F110/02C08L23/12C08L2201/08C08L2205/025C08L2205/035C08L2205/24C08L2207/07C08L2314/08C08L23/14C08L23/06C08L23/0815C08K13/02C08K3/34C08K5/372
Inventor 刘冉高翔彭志宏傅轶谭颂斌
Owner GUANGDONG SILVER AGE SCI & TECH CO LTD
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