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Process for producing expanded polypropylene beads

A foamed polypropylene and production process technology, which is applied in the field of production process of foamed polypropylene beads, can solve the problems of strain on reaction kettles and containers, potential safety hazards, and difficulty in controlling apparent quality, so as to increase the service life of equipment. , The effect of reducing hidden dangers in production safety and easy control of product quality

Inactive Publication Date: 2015-12-02
SHANGHAI HUATE AUTOMOTIVE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature is difficult to control and it is difficult to ensure the quality of expanded polypropylene
[0004] 2. Kettle-type intermittent production: low efficiency, complex process, high equipment requirements
Due to the high pressure, there is a great impact during the instantaneous release process, which is easy to cause strain on the reactor and the container, and there is a potential safety hazard; due to the instantaneous discharge under high temperature and high pressure conditions, the material surface is released into the container before cooling down in time. The foamed polypropylene beads are easy to deform, the foaming of polypropylene is uneven, and the apparent quality is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 100 kg of polypropylene resin masterbatch, 300 kg of pure water, 0.5 kg of sodium dodecylbenzenesulfonate, and 0.3 kg of kaolin powder into the autoclave, and feed high-pressure CO 2 The gas makes the pressure in the reactor reach 5.1MPa. Stir and disperse the mixture in the autoclave at a stirring rate of 120 rpm. Heat to 155°C at a certain heating rate through the automatic control of cascade PID constant temperature, use double regulating valves to keep the pressure in the reactor constant at 3.3MPa, keep constant temperature and pressure for 50 minutes, and start the discharge pipe after the system reaches complete saturation Feed fan, start the cooling water pump, start the centrifugal dehydrator, when the above equipment is in normal operation, first turn on the CO 2 Regulate the valve to increase the pressure to 6.0MPa, open one end of the autoclave, and discharge the dispersion in the autoclave to the centrifugal dehydrator. At the same time as the materia...

Embodiment 2

[0039] Add 100 kg of polypropylene resin masterbatch, 200 kg of pure water, 0.1 kg of sodium dodecylbenzenesulfonate, and 0.1 kg of kaolin powder into the autoclave, and feed high-pressure CO 2 The gas makes the pressure in the reactor reach 2.0MPa. Stir and disperse the mixture in the autoclave at a stirring rate of 120 rpm. Heating to 135°C at a certain heating rate through the automatic control of cascade PID constant temperature, using double regulating valves to keep the pressure in the reactor constant at 5MPa, keeping constant temperature and pressure for 30 minutes, and starting the discharge pipe to feed the material after the system reaches complete saturation Fan, start the cooling water pump, start the centrifugal dehydrator, when the above equipment is in normal operation, first turn on the CO 2 Regulate the valve to increase the pressure to 4.0 MPa, open one end of the autoclave, and discharge the dispersion in the autoclave to the centrifugal dehydrator. At th...

Embodiment 3

[0041] Add 100 kg of polypropylene resin masterbatch, 400 kg of pure water, 0.8 kg of sodium dodecylbenzenesulfonate, and 0.8 kg of kaolin powder into the autoclave, and feed high-pressure CO 2 The gas makes the pressure in the reactor reach 7.0MPa. Stir and disperse the mixture in the autoclave at a stirring rate of 120 rpm. Heating to 168°C at a certain heating rate through the automatic control of cascade PID constant temperature, using double regulating valves to keep the pressure in the reactor constant at 7.0MPa, keeping constant temperature and pressure for 60 minutes, and starting the discharge pipe after the system reaches complete saturation Feed fan, start the cooling water pump, start the centrifugal dehydrator, when the above equipment is in normal operation, first turn on the CO 2 Regulate the valve to increase the pressure to 8.0MPa, open one end of the autoclave, and discharge the dispersion in the autoclave to the centrifugal dehydrator. At the same time as th...

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PUM

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Abstract

The invention provides a process for producing expanded polypropylene beads. According to the process, polypropylene resin serving as a substrate, pure water serving as a solvent, carbon dioxide serving as a foaming agent, sodium dodecylbenzene sulfonate serving as a surfactant and kaolin powder serving as a dispersant are put in a reaction kettle to form a polymer / gas homogeneous saturated system under a constant-temperature constant-pressure state, and are discharged at a constant pressure to obtain the expanded polypropylene beads. The process is simple in operation, the expanded polypropylene beads can be expanded uniformly, fluid flows smoothly without wall sticking or deformation, and the quality of the polypropylene beads is easy to control; and since constant-temperature constant-pressure discharge is adopted, equipment damage is reduced, the service life of equipment is prolonged, and potential risks of safe production are reduced.

Description

technical field [0001] The invention relates to a production process of chemicals, in particular to a production process of expanded polypropylene beads. Background technique [0002] Expanded polypropylene (EPP) is a foam plastic with excellent performance. It has high strength, good chemical resistance, high temperature resistance, excellent energy absorption, surface protection and sound insulation, and light weight. The weight of the item; it can be naturally degraded without causing white pollution. It is called "green" foam and is the fastest-growing general-purpose thermoplastic material in the world. At present, EPP has been widely used in daily necessities, packaging, industry, agriculture, transportation, military industry, aerospace industry, and is rapidly replacing polyurethane (PU) foam, polystyrene (PS) foam and polyethylene hydrocarbon (PE) ) Styrofoam. At present, the methods of producing foamed polypropylene at home and abroad mainly adopt two methods: ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18C08L23/12C08K5/42C08K3/34
Inventor 张曼玲赵坤
Owner SHANGHAI HUATE AUTOMOTIVE PARTS
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