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Method for preparing controlled degradable polypropylene foamed particles

A technology of foamed particles and polypropylene, which is applied in the field of preparation of controllable degradable polypropylene foamed particles, to achieve the effects of increasing plasticization, reducing use costs, and reducing foaming temperature

Active Publication Date: 2011-09-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple administrative intervention cannot solve the environmental pollution problem caused by "white pollution" in a short period of time. In order to fundamentally solve this problem, it is imperative to prepare polymer-based foaming materials with environmental degradation ability

Method used

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  • Method for preparing controlled degradable polypropylene foamed particles
  • Method for preparing controlled degradable polypropylene foamed particles
  • Method for preparing controlled degradable polypropylene foamed particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add the blend of polypropylene, polylactic acid and mica to the twin-screw extruder, according to the mass percentage, polylactic acid accounts for 20% of the blend, mica accounts for 1%, and the polymer melt is extruded by twin-screw Transfer and transport to the die mouth of the extruder, granulate after water cooling. The die chosen had 12 holes, each hole had a diameter of 0.6 mm, and the resulting polymer pellets had a diameter of 0.9 mm to 1.2 mm.

[0029] Put 1 kg of polymer pellets, 5 liters of water, and 6.0vol% pentane into the autoclave, and raise the temperature of the autoclave to 85°C, 90°C, and 97.5°C under stirring conditions, and saturate at 1.5°C at constant temperature and pressure. hours to allow the alkane blowing agent to penetrate into the sample. The autoclave is quickly released within 30 seconds, and the materials in the autoclave and liquid materials are quickly ejected out of the autoclave vent valve, and the polymer pellets are rapidly expa...

Embodiment 2

[0040] Add the blend of polypropylene, polybutylene succinate and nano-montmorillonite to the twin-screw extruder, and polybutylene succinate accounts for 30% of the blend in terms of mass percentage , nano-montmorillonite accounted for 1%, the polymer melt is transported to the die of the extruder through twin-screw extrusion, and granulated after water cooling. The die chosen had 12 holes, each hole had a diameter of 0.6 mm, and the resulting polymer pellets had a diameter of 0.9 mm to 1.2 mm.

[0041] Put 1 kg of polypropylene blend, 5 liters of water, and 6.0vol% pentane into the autoclave, and raise the temperature of the autoclave to 75°C, 85°C, and 92°C under stirring conditions, and saturate at constant temperature and pressure 1.0 hour to allow the alkane blowing agent to penetrate into the sample. The autoclave is quickly released within 30 seconds, and the materials in the autoclave and liquid materials are quickly ejected out of the autoclave vent valve, and the p...

Embodiment 3

[0051] The blend of polypropylene and polyhydroxybutyrate is added to the twin-screw extruder, in terms of mass percentage, polyhydroxybutyrate accounts for 5% of the blend, and the polymer melt is transferred through twin-screw extrusion Transport to the die of extruder, granulate after water cooling. The die chosen had 12 holes, each hole had a diameter of 0.6 mm, and the resulting polymer pellets had a diameter of 0.9 mm to 1.2 mm.

[0052] Put 1 kg of polymer pellets, 5 liters of water, and 4.0vol% HFC-245fa into the autoclave, raise the temperature of the autoclave to 88°C, 92°C, and 98°C under stirring conditions, and inject co-foaming Agent CO 2 Make the pressure of the kettle to 1 MPa, and saturate at constant temperature and pressure for 6 hours, so that the HFC foaming agent can penetrate into the sample. The autoclave is quickly released within 30 seconds, and the materials in the autoclave and liquid materials are quickly ejected out of the autoclave vent valve, ...

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Abstract

The invention discloses a method for preparing controlled degradable polypropylene foamed particles. In the method, bioplastic is introduced into polypropylene resin in a certain ratio by a near-melting point foaming technology, the environment degradation speed of the polypropylene foamed particles is increased through a coordination effect of bioplastic environment degradation, and the mass percentage content of the bioplastic is controlled to fulfill the aim of controlling the environment degradation speed of the polypropylene foamed particles. In addition, by the preparation method, the foaming temperature of polypropylene can be reduced, and the foaming window of the polypropylene can be expanded from 3-5 DEG C to 10-27 DEG C, so that the requirement on a temperature control device of kettle pressure foaming equipment and the using cost of heat in the process of preparing foamed particle forming bodies are reduced.

Description

technical field [0001] The invention relates to a preparation method of polypropylene foamed particles, in particular to a preparation method of controllable degradable polypropylene foamed particles. Background technique [0002] Polypropylene has the advantages of excellent mechanical strength, high service temperature, excellent processability, and easy recycling, so its application fields are increasing and its market share is increasing year by year. The polypropylene foamed particle molding formed by in-molding polypropylene foamed particles also maintains the excellent properties of polypropylene resin. At the same time, the polypropylene expanded particle molded body also has the inherent cushioning and insulating properties of foam materials. , light weight and other advantages, so it is widely used in the inner core of automobile bumpers, shock absorbing materials for vehicles, cushioning packaging materials, building materials, etc. [0003] In most cases, foamed...

Claims

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Application Information

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IPC IPC(8): C08J9/14C08L23/14C08L23/12C08L53/00C08L67/04C08L67/02C08K3/34
Inventor 郑文革汤林奇文渊翟文涛吴飞
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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