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Preparation method with high yield, low cost and environmental protection for polypropylene beads

A polypropylene, low-cost technology, applied in the field of high-yield, low-cost and environmentally friendly polypropylene beads, can solve the problems of long production cycle, high required pressure, large equipment investment, etc., and achieve adjustable foaming ratio and increase Melt strength, effect of increasing bubble heterogeneous nucleation

Inactive Publication Date: 2018-01-19
绵阳旺通科技有限公司
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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 method for preparing high-yield and low-cost environment-friendly polypropylene beads, comprising the following steps:

[0027] 1) Add polypropylene resin, active filler, caprolactam 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 by a water ring on the mold surface to obtain high-yield, low-cost, and environmentally friendly polypropylene beads.

[0030] Preferably, the polypropylene resin in step 1) is...

Embodiment 1

[0051] Add 100kg homopolypropylene, 10kg caprolactam, 1kg nano-scale talc powder, 0.5kg stearic acid, 0.2kg antioxidant 1010 and 5kg nano-scale carbon black into a low-temperature high-speed mixer, mix well, Then the material is transferred to the three-screw extruder at a speed of 10kg / h with an automatic feeding system, and a filling port is set in the barrel homogenization section of the three-screw extruder, and supercritical carbon dioxide is injected at a speed of 300g / h Into the machine barrel, the melt pump increases and stabilizes the die pressure, foams through the nozzle die, the die surface water ring is eagerly cut and granulated, dehydrated and dried, and sieved to obtain high-yield, low-cost and environmentally friendly 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, 5kg of caprolactam, 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, and then transfer the material to the three-screw extruder at a speed of 10kg / h with an automatic feeding system, set a filling port in the barrel homogenization section of the three-screw extruder, and supercritical carbon dioxide Injected into the machine barrel at a speed of 800g / h, the melt pump increases and stabilizes the die pressure, foams through the head die, the water ring on the die surface is eagerly cut and granulated, dehydrated and dried, and sieved to obtain high output, low cost and environmental protection type 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 provided a preparation method with high yield, low cost and environmental protection for polypropylene beads. The preparation method is characterized by comprising the following steps: adding polypropylene resin, an active filling material, caprolactam and an auxiliary agent into a high-speed mixer, and carrying out uniform mixing at 10 to 20 DEG C so as to obtain a polypropylene foamed material.

Description

technical field [0001] The invention relates to a method for preparing high-yield, low-cost, and environment-friendly polypropylene beads, in particular to a method for preparing high-yield, low-cost, and environment-friendly 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 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L23/12C08L23/14C08L53/00C08K13/06C08K5/3412C08K3/04B29B9/06B29C47/92B29K23/00B29C48/92
Inventor 郑小明
Owner 绵阳旺通科技有限公司
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