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A polypropylene composition with low flow marks and low weld marks and its preparation method

A polypropylene composition and polypropylene technology, applied in the field of low weld line polypropylene composition and its preparation, and low flow marks, can solve the problem of bimodal polypropylene weld line, poor processability, polypropylene composition melt Low flow rate and other problems, to achieve low weld lines, reduce fluidity differences, and improve the effect of melt flow

Active Publication Date: 2016-07-06
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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  • A polypropylene composition with low flow marks and low weld marks and its preparation method
  • A polypropylene composition with low flow marks and low weld marks and its preparation method
  • A polypropylene composition with low flow marks and low weld marks and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 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 Powder, the main antioxidant DSTP of 0.2wt%, the secondary antioxidant 168 of 0.2wt%, the light stabilizer 770 of 0.2wt%, the light stabilizer 944 of 0.2wt% and the pigment of 0.5wt% are put into high-speed mixer Blend for 3 minutes at a rotational speed of 1000 rpm, then put the mixture into a twin-screw extruder for melting and kneading, and extrude 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] Weigh 4wt% polypropylene A, 3wt% polypropylene B, 61.7wt% polypropylene C, 10wt% hyperbranched polyethylene A, 10wt% ethylene and α-olefin copolymer A, 10wt% inorganic filler, 0.2wt% of the main antioxidant DSTP, 0.2wt% of the secondary antioxidant 168, 0.4wt% of the light stabilizer 770 and 0.5wt% of the pigment were mixed in a high-speed mixer for 4min at a speed of 1000rpm, and then the mixture was added Melt and knead in a twin-screw extruder, extrude and 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] Weigh 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% of the main antioxidant 1010, 0.1wt% of the auxiliary antioxidant 618, 0.1wt% of the light stabilizer 770, 0.1wt% of the light stabilizer 944 and 1wt% of the pigment were put into a high-speed mixer and mixed for 5min , with a rotating speed of 1000rpm, and then the mixture was added into 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 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 Patents(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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