Degradable environment-friendly type polypropylene(PP) foam plastic and preparation method thereof

Abstract

The invention provides an environment-friendly-type polypropylene (pp) aerated plastics and a process for preparation, and the aerated plastics utilizes plastic projectile body to be basis material, a third monomer is led in to be auxiliary crosslinking agent to crosslink and control degradation products, aerated plastics section products are made by processing graft copolymerization and cross-linking reaction to polypropylene, and closely welding, openly welding, tabletting, and foaming to shape with compatibilizer, filling material, nucleating agent, cross linking agent and inflating agent. The invention modifies the shortcomings that the traditional homopolymerized polypropylene can not get higher breakpoint extension force, high melt intensity and viscosity to foam and shape in the process of thermal foaming and shaping. The polypropylene (pp) aerated plastics products which are provided by the invention have excellent fire-resisting property and little heat distortion degree, and the softening point is between 100 DEG C and 130 DEG C. The invention can be used for long term in the temperature scope, and the application area is wide, wastes can be recycled, and can be automatically degraded, and the invention has no pollution to environment.

Description

technical field [0001] The invention relates to a degradable and environment-friendly polypropylene (pp) foam plastic and a preparation method thereof. Background technique [0002] Compared with polystyrene (PS), polyurethane (PU), polyethylene (PE) and EVA foam materials, polypropylene (pp) foam materials have excellent heat resistance, mechanical properties and good environmental adaptability And other advantages and favored by the market. However, since polypropylene (PP) is a crystalline polymer, the copolymerized polypropylene block type is based on propylene as the main chain and introduces ethylene chain into a copolymer (CO-PP), which is an incomplete crystalline polymer; There is almost no flow below the ene point, but above the melting point of the crystal, the melt viscosity drops sharply. This characteristic leads to the fact that during the foaming process, the gas generated is difficult to enclose and cannot become bubbles. At the same time, it will change fr...

AI Technical Summary

Problems solved by technology

However, since polypropylene (PP) is a crystalline polymer, the copolymerized polypropylene block type is based on propylene as the main chain and introduces ethylene chain into a copolymer (CO-PP), which is an incomplete crystalline polymer; There is almost no flow below the ene point, but above the melting point of crystallization, the viscosity of the melt drops sharply. This characteristic leads to the fact that during the foaming process, the gas generated is difficult to enclose and cannot become bubbles. Release a lot of heat (large specific heat capacity), it takes a long time to cure

In the manufacturing process of traditional homopolymerized propylene, the product performance of the foaming production process is poor, especially the production technology of foamed PP composite materials is relatively difficult, and it is difficult to obtain high melt strength and viscosity and a certain amount of gel. colloid, resulting in poor toughness, low melt strength, poor thermoforming and foaming performance, and it is difficult to obtain high expansion ratio due to failure to obtain high breaking point extension force, high melt strength and viscosity in the thermal foaming molding process It is difficult to obtain high-quality foamed plastic products, which limits its applicability in the field of thermoforming and foamed materials, and the manufacturing process is complicated, difficult to process, and high production cost

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