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Preparation of graft modified high melt elasticity and high extensional viscosity foamed polypropylene material (PP-g-GMA/ST)

A technology of polypropylene material and foamed polypropylene, applied in the field of modified high-melt foamed polypropylene material, which can solve the problem of high resin price

Inactive Publication Date: 2010-06-16
林世平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high melt strength PP resin is used for foam molding, but the price of the resin is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Weigh 100 parts of PP material, 0.06 parts of DCP, 3.5 parts of ST, 8 parts of GMA, and 2 parts of nano-calcium carbonate; mix DCP, ST, GMA and acetone respectively at a concentration of about 20%; After 2 parts of calcium carbonate are fully stirred and mixed evenly at high speed, the mixed initiator and monomer solution are evenly sprinkled into the PP material, stirred evenly, and left for a period of time until the acetone is basically volatilized, then extruded with parallel twin-screws Extrude on the machine and granulate under water. The screw speed is: 150~200r / min; the temperature of each section of the extruder is: 170°C, 180°C, 190°C, 195°C, 200°C, 210°C, and the temperature of the head is: 230°C. The cooling water temperature is about 30°C. The grafting rate of the grafted polymer is about 5%, and the sag resistance is about 60 / min.

example 2

[0018] Weigh 100 parts of PP material, 0.05 parts of DCP, 2.5 parts of ST, 6 parts of GMA, and 1 part of nano calcium carbonate; mix DCP, ST, GMA and acetone respectively at a concentration of about 20%; After 1 part of calcium carbonate is fully stirred and mixed evenly at high speed, the mixed initiator and monomer solution are evenly sprinkled into the PP material, stirred evenly, and left for a period of time until the acetone is basically volatilized, then extruded with parallel twin-screws Extrude on the machine and granulate under water. The screw speed is: 150~200r / min; the temperature of each section of the extruder is: 170°C, 180°C, 190°C, 195°C, 200°C, 210°C, and the temperature of the head is: 230°C. The cooling water temperature is about 30°C. The grafting rate of the grafted polymer is about 3%, and the sag resistance is about 50 / min.

example 3

[0020] Weigh 100 parts of PP material, 0.08 parts of DCP, 2.0 parts of ST, 12 parts of GMA, and 3 parts of talc powder; mix DCP, ST, GMA and acetone respectively at a concentration of about 20%; After the 3 parts of calcium are fully stirred and mixed evenly at high speed, the mixed initiator and monomer solution are evenly sprinkled into the PP material, stirred evenly, and left for a period of time until the acetone is basically volatilized, and then extruded with parallel twin-screws On-machine extrusion and underwater granulation. The screw speed is: 150~200r / min; the temperature of each section of the extruder is: 170°C, 180°C, 190°C, 195°C, 200°C, 210°C, and the temperature of the head is: 230°C. The cooling water temperature is about 30°C. The grafting rate of the grafted polymer is about 2%, and the sag resistance is about 30 / min.

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Abstract

The invention relates to a method for preparing a graft modified high melt elasticity and high extensional viscosity foamed polypropylene material (PP-g-GMA / ST). Dicumyl peroxide is adopted as an initiator for hydrogen elimination reaction to form a PP macro-radical bond; the radical bond may generate graft or chain scission reaction; the reaction activity of ST serving as a co-initiator is higher than that of GMA; the ST is grafted to the PP in priority; after a more stable styryl macro-radical is formed, the styryl macro-radical is reacted with glycidyl methacrylate to realize the branching of polypropylene in a double screw extruder serving as a reactor; and the grafting rate of the PP can be improved. The method can prepare the graft modified high melt elasticity and high extensional viscosity foaming polypropylene material (PP-g-GMA / ST). The PP with high grafting rate can improve the melt strength and the extensional viscosity of a PP system and the strain hardening. The high melt strength and high extensional viscosity can promote the stable increase of air bubbles, block the rapid diffusion of air, reduce the combination of the air bubbles, limit the breakage of bubble pores, and improve the foaming molding of the PP material. The added inorganic nano nucleating agent refines crystal grains of a polypropylene structure, destroys polypropylene crystallinity to strengthen the viscosity of a fusant when the polypropylene is heated and melted, and enlarges a temperature range suitable for foaming molding.

Description

Technical field: [0001] The invention belongs to the field of modified high-melt foaming polypropylene materials, and particularly relates to the use of dicumyl peroxide (DCP) as an initiator, styrene (ST) as a co-initiator, and a twin-screw extruder as an initiator. The reactor grafts glycidyl methacrylate (GMA) to the polypropylene (PP) bond to achieve polypropylene branching, so as to increase the extensional viscosity and melt strength of PP, and improve the foaming and molding properties of PP materials . technical background: [0002] PP is a highly crystalline polymer. The extensional viscosity of general-purpose PP melts does not show strain hardening during stretching, and the elasticity (melt strength) of the melt is very low, and its melt strength drops sharply at the melting temperature. , so that the temperature range suitable for foaming is narrowed, the gas is easy to escape during foaming, and it is easy to cause cell rupture and collapse, which seriously af...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F2/44C08K3/26C08K3/34C08J9/00C08L51/06
Inventor 林世平
Owner 林世平
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