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A method for preparing high melt flow rate polypropylene by modifying polypropylene t30s pellets

A technology of flow rate and polypropylene, which is applied in the field of polypropylene modified special materials, can solve the problems of toxic residues, high molecular weight distribution coefficient, and difficult to remove product odor, and achieve good product stability, high product quality, The effect of small molecular weight distribution

Active Publication Date: 2017-02-15
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the currently commonly used peroxidant initiator system containing only benzene rings will cause problems such as excessive odor that is difficult to remove, toxic residues in the product, and high molecular weight distribution coefficient (greater than 3) in the production process and products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the first step, mix 92g of polypropylene T30s pellets with 1g of composite antioxidant (1010+168) (mass ratio 1:1), 1g of calcium stearate, and stir at a low speed for 5-15min to obtain a masterbatch;

[0023] In the second step, put 100g of polypropylene T30s pellets and 2g of masterbatch into a high-speed mixer, and mix at high speed for 5-20min to obtain a mixture;

[0024] The third step is to turn on the twin-screw extruder, take 98g of the dried mixture and feed it evenly from the hopper, start from the third section of the barrel, set the temperature at 260°C, and the material stays in the extruder for 30 seconds. Speed ​​200rpm;

[0025] Step 4: Dissolve 0.05g of 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxynonane in 1g of C12-20 isoparaffin and mix well. The second heating module of the extruder is pumped in by a metering pump to completely decompose the peroxide. Vacuum suction is used in the heating zone in front of the die to extrude and cut into pellet...

Embodiment 2

[0028] In the first step, mix 88g of polypropylene T30s pellets with 3g of composite antioxidant (1010+168) (mass ratio 1:1), 3g of calcium stearate, and stir at a low speed for 10 minutes to obtain a masterbatch;

[0029] In the second step, the 100 g Put polypropylene T30s pellets and 4g masterbatch into a high-speed mixer, and mix at high speed for 5-20min to obtain a mixture;

[0030] The third step is to turn on the twin-screw extruder, take 97g of the dried mixture and feed it evenly from the hopper, start from the third section of the barrel, set the temperature at 240°C, and the material stays in the extruder for 20 seconds. Speed ​​400rpm;

[0031] Step 4: Dissolve 0.01g of 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxynonane in 1.5g of C12-20 isoparaffin and mix well. The second heating module of the extruder is pumped in by a metering pump to completely decompose the peroxide. Vacuum suction is used in the heating zone in front of the die to extrude and cut into p...

Embodiment 3

[0034] In the first step, mix 97g of polypropylene T30s pellets with 5g of composite antioxidant (1010+168) (mass ratio 1:1), 5g of calcium stearate, and stir at a low speed for 5 minutes to obtain a masterbatch;

[0035] In the second step, put 100g of polypropylene T30s pellets and 6g of masterbatch into a high-speed mixer, and mix at high speed for 5 minutes to obtain a mixture;

[0036] The third step is to turn on the twin-screw extruder, take 95g of dried mixed material and feed it evenly from the hopper, start from the third section of the barrel, set the temperature at 200°C, and the material stays in the extruder for 15 seconds. Speed ​​600rpm;

[0037] Step 4: Dissolve 0.2g of 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxynonane in 2g of C12-20 isoparaffin and mix well. The second heating module of the extruder is pumped in by a metering pump to completely decompose the peroxide. Vacuum suction is used in the heating zone in front of the die to extrude and cut into ...

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Abstract

The invention discloses a method for preparing high-melt-flow-rate polypropylene by virtue of polypropylene T30s aggregate modification, belongs to the technical field of production of special materials for polypropylene modification, and in particular relates to a method for obtaining a polypropylene coating material compound by modifying the polypropylene T30s aggregate. An isoparaffin solution of 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-trinonane peroxide serves as a degradation agent. Because the method is initiated by adopting the isoparaffin solution of 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-trinonane peroxide, toxic or odorous harmful substances are not generated after decomposition, so that the reaction is uniform and stable, and the product is extremely high in quality and high in stability. The product has the characteristics of molecular weight distribution of less than 3, small coating shrinkage, high yield and odorlessness.

Description

technical field [0001] The invention belongs to the technical field of production of polypropylene modified special materials, and in particular relates to a method for modifying polypropylene T30s pellets to obtain a polypropylene coating material composition. Background technique [0002] The melt flow rate of polypropylene itself is not high, the relative molecular mass is relatively high, the relative molecular mass distribution is wide, and the processability is poor. However, after the modification of polypropylene, the melt flow rate and surface coating performance have been greatly improved, so it can be widely used in the coating of woven bags, bidirectional stretch polypropylene film, pharmaceuticals and other packaging materials. It has the advantages of good peel strength, good heat sealing performance and good flow performance. [0003] The polypropylene drool film is directly coated on the woven bag, which increases the strength and overall performance of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K5/00C08K5/14C08K5/098C08K5/134C08K5/526C08J3/22B29C47/92B29C48/92
CPCC08J3/226C08J2323/12C08K5/0008C08K5/0033C08K5/098C08K5/1345C08K5/14C08K5/526C08L23/12
Inventor 杨金明王波田小艳任蕊
Owner SHAANXI YANCHANG PETROLEUM GRP
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