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Preparation method of foamed polypropylene beads

A technology of foamed polypropylene and polypropylene, which is applied in the field of preparation of foamed polypropylene beads, can solve the problems of high pressure, long production cycle, large investment in equipment, etc., and can improve the melt strength and expand the expansion ratio Adjust and increase the effect of heterogeneous nucleation of bubbles

Active Publication Date: 2017-03-29
湖北聚石新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process conditions of the intermittent kettle pressure foaming method are easy to control, and can prepare foamed beads with adjustable magnification and closed cell ratio, but it requires high pressure, large equipment investment, high cost, and long production cycle. It is only JSP in the world. , BASF, KANKA and other companies adopt this method for production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A preparation method for expanded polypropylene beads, comprising the following steps:

[0027] 1) Add polypropylene resin, active fillers and additives into a high-speed mixer, and mix evenly at 10-20°C to obtain polypropylene foam;

[0028] 2) Add polypropylene foaming material to the three-screw extruder for plasticization and mixing, and then inject supercritical fluid into the homogenization section of the three-screw extruder, control the die pressure to 5-25MPa, and The mold temperature is 110-160°C, and then the pressure is released instantly through the die, and foaming is carried out to obtain ultra-fine microcellular foamed polypropylene;

[0029] 3) Ultra-fine and microporous expanded polypropylene is eagerly granulated, dried, and sieved through a water ring on the mold surface to obtain expanded polypropylene beads.

[0030] Preferably, the polypropylene resin in step 1) is at least one of homopolypropylene, random copolymerized polypropylene, and block c...

Embodiment 1

[0051] Add 100kg of homopolypropylene, 1kg of nanoscale talc powder activated by coupling agent, 0.5kg of stearic acid, 0.2kg of antioxidant 1010 and 5kg of nanoscale carbon black into a low-temperature high-speed mixer, mix well, and then mix the materials Use an automatic feeding system to transfer to the three-screw extruder at a speed of 10kg / h, set a filling port in the barrel homogenization section of the three-screw extruder, and inject supercritical carbon dioxide into the barrel at a speed of 300g / h , through the melt pump to increase and stabilize the die pressure, foaming through the head die, die surface water ring eagerly granulated, dehydrated and dried, sieved to obtain expanded polypropylene beads. Control the die pressure to 8MPa, die temperature to 138°C, and obtain black beads with a foaming ratio of 28 times and uniform color.

Embodiment 2

[0053] Add 90kg of homopolypropylene, 10kg of long-chain branched polypropylene, 2kg of nanoscale talc powder activated by a coupling agent, 1kg of stearic acid, 0.5kg of antioxidant 1010 and 8kg of pink color masterbatch into the low-temperature high-speed mixer , mix evenly, then the material is transferred to the three-screw extruder with the speed of 10kg / h with the automatic feeding system, and the filling port is set in the barrel homogenization section of the three-screw extruder, and the supercritical carbon dioxide is fed at 800g / h The speed of h is injected into the barrel, the melt pump increases and stabilizes the die pressure, the die is foamed through the die, the water ring on the die surface is eagerly cut and granulated, dehydrated and dried, and sieved to obtain expanded polypropylene beads. Control the die pressure to 17MPa, die temperature to 125°C, and obtain pink beads with a foaming ratio of 42 times and uniform color.

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Abstract

The invention discloses a preparation method of foamed polypropylene beads. The method comprises the following steps that 1, polypropylene resin, an active filler and auxiliaries are added into a high-speed mixing machine and mixed to be uniform at the temperature of 10-20 DEG C, and a polypropylene foaming material is obtained; 2, the polypropylene foaming material is added into a triple-screw extruder, plastification and mixing are conducted, a supercritical fluid is injected, the mouth mold pressure is controlled to be 5-25 MPa, the mouth mold temperature is 110-160 DEG C, instant pressure release is conducted through a mouth mold, foaming is conducted, and super-fine hole foamed polypropylene is obtained; 3, super-fine hole foamed polypropylene is subjected to mold surface water-ring hot-cutting granulation, drying and sieving, and the foamed polypropylene beads are obtained. The method is low in production cost, high in capacity, safe and environmentally friendly, no foaming agent decomposed residue exists in the prepared foamed polypropylene beads, secondary foaming can be conducted, the foaming ratio can be adjusted, the rebound resilience of a finished product is high, decomposing and recycling are easy, and the foamed polypropylene beads can be widely used in the fields of plastic packaging, transportation industry, military aerospace, office supplies and the like.

Description

technical field [0001] The invention relates to a method for preparing expanded polypropylene beads, in particular to a method for preparing expanded polypropylene beads by using a three-screw extruder, and belongs to the technical field of polymer foaming. Background technique [0002] Foam plastics have the advantages of light weight, energy absorption, sound insulation, heat insulation, and high specific strength, and are widely used in plastic packaging, transportation, military aerospace, office daily necessities and other fields. Compared with expanded polyethylene (EPE) and expanded polystyrene (EPS), expanded polypropylene (EPP) has many unique advantages: 1) Mechanical properties: since the flexural modulus of polypropylene is much greater than that of polyethylene , making EPP better than EPE in anti-static load capacity, and better in impact resistance than EPS; 2) Heat resistance: EPP can be used for a long time in a high temperature environment around 120 ° C, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K13/06C08K9/04C08K3/34C08K5/09C08K3/04C08K5/134C08J9/12C08L23/14C08L53/00B29B9/06B29B9/12
CPCB29B9/06B29B9/12C08J9/122C08J2203/06C08J2323/12C08J2323/14C08J2353/00C08K3/04C08K3/34C08K5/09C08K5/1345C08K9/04C08K13/06C08K2201/011C08L23/12C08L23/14C08L53/00C08L2203/14C08L2205/02
Inventor 袁瑞建朱红芳杨正高陈钢
Owner 湖北聚石新材料科技有限公司
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