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A method of shortening the molding cycle of EPP beads

A technology of molding cycle and beads, which is applied in the field of shortening the molding cycle of EPP beads, can solve the problems of long cycle and high energy consumption of EPP molding, and achieve the effect of saving consumption and shortening cooling time

Active Publication Date: 2021-07-30
WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems of high energy consumption and long cycle of EPP molding in the prior art, and provide a method for shortening the cycle of EPP bead molding

Method used

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  • A method of shortening the molding cycle of EPP beads

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Comparison scheme
Effect test

Embodiment 1

[0027] A method for shortening the molding cycle of EPP beads, characterized in that the steps are as follows in parts by weight:

[0028] Preparation of S1 EPP foam masterbatch: Mix 100 parts of polypropylene resin, 0 part of silicon dioxide, 1 part of lubricant, and 0.5 part of nucleating agent in a high-speed mixer, and mix evenly through twin-screw extrusion process , cut into EPP foam masterbatch;

[0029] S2 foaming process: Put the EPP foaming masterbatch obtained in step (1) into the foaming kettle, heat and pressurize until the foaming temperature and foaming pressure are reached, and then release it to atmospheric pressure instantly to obtain EPP beads;

[0030] S3 Molding: After pre-pressing the EPP beads obtained in step (2), inject them into a molding machine, use steam for thermoforming, cool with water, and demould to obtain an EPP molded body.

Embodiment 2

[0032] A method for shortening the molding cycle of EPP beads, characterized in that the steps are as follows in parts by weight:

[0033] Preparation of S1 EPP foam masterbatch: mix 100 parts of polypropylene resin, 0.5 parts of silicon dioxide, 1 part of lubricant, and 0.5 parts of nucleating agent in a high-speed mixer, and mix evenly through twin-screw extrusion process , cut into EPP foam masterbatch;

[0034] S2 foaming process: Put the EPP foaming masterbatch obtained in step (1) into the foaming kettle, heat and pressurize until the foaming temperature and foaming pressure are reached, and then release it to atmospheric pressure instantly to obtain EPP beads;

[0035] S3 Molding: After pre-pressing the EPP beads obtained in step (2), inject them into a molding machine, use steam for thermoforming, cool with water, and demould to obtain an EPP molded body.

Embodiment 3

[0037] A method for shortening the molding cycle of EPP beads, characterized in that the steps are as follows in parts by weight:

[0038] Preparation of S1 EPP foam masterbatch: mix 100 parts of polypropylene resin, 1 part of silicon dioxide, 1 part of lubricant, and 0.5 part of nucleating agent in a high-speed mixer, and mix evenly through twin-screw extrusion process , cut into EPP foam masterbatch;

[0039] S2 foaming process: Put the EPP foaming masterbatch obtained in step (1) into the foaming kettle, heat and pressurize until the foaming temperature and foaming pressure are reached, and then release it to atmospheric pressure instantly to obtain EPP beads;

[0040] S3 Molding: After pre-pressing the EPP beads obtained in step (2), inject them into a molding machine, use steam for thermoforming, cool with water, and demould to obtain an EPP molded body.

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Abstract

The invention relates to a method for shortening the molding cycle of EPP beads, which belongs to the technical field of environmental protection. Blending modification is carried out by adding micron silicon dioxide, and EPP beads are prepared by using a kettle-type foaming process, and then molded and thermoformed by steam to prepare an EPP molded body. In the present invention, micron silicon dioxide is uniformly dispersed in polypropylene. Since the thermal conductivity of silicon dioxide is much greater than that of foamed polypropylene, heat can be transferred quickly during steam molding and thermoforming, realizing steam heat The rapid transmission and the improvement of the conversion rate directly reduce the input of steam and the use time of cooling water, and finally realize the shortening of the EPP molding cycle by 70%, which greatly improves the production efficiency for customers.

Description

technical field [0001] The invention relates to a method for shortening the molding cycle of EPP beads. Background technique [0002] At present, the EPP material produced by the supercritical carbon dioxide kettle process has gradually expanded its application from the automotive field to packaging, logistics, and home furnishing because of its light weight, excellent mechanical properties, anti-buffering, and environmental protection. However, with the continuous improvement of application acceptance and the rapid growth of demand, the market has put forward new requirements for it. 1. For the existing application fields, the market requires lighter materials with the same or higher performance ; 2. Not only the expansion of application fields, but also the continuous increase of market demand, put forward high requirements for the production efficiency of downstream molding manufacturers, hoping to produce more products in a shorter period of time, so as to continuously m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14C08K13/02C08K3/36C08K5/098C08K3/34C08K3/38C08J9/24
CPCC08J9/0023C08J9/0066C08J9/0095C08J9/24C08J2323/14
Inventor 刘缓缓何若虚曾佳杨亮炯黄二波史加新叶明熊业志路骐豪贾志文吴艳周仲波
Owner WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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