Preparation method of CO2 plastic foaming agent and injection system of CO2 plastic foaming agent

Abstract

The invention discloses a preparation method of a CO2 plastic foaming agent and an injection system of a CO2 plastic foaming agent. The foaming agent is prepared from 3-4 parts of liquid-state CO2 and 1-2 parts of food-grade ethanol by weight. The preparation method comprises the following steps of: enabling CO2 to pass through a refrigeration system to enter a high-pressure membrane low-temperature injection pump from a CO2 liquid storage tank, and metering and proportioning the CO2 through a CO2 flow data sensor to enter a static mixer; enabling ethanol to enter a high-pressure injection pump from an ethanol storage tank, and metering and proportioning the ethanol through an ethanol flow data sensor to enter a static mixer; and fully mixing CO2 and the food-grade ethanol by static mixers to enter an energy storage tank; and intermittently injecting the mixed liquid into a foaming agent machine body by a one-way injection valve to produce the CO2 plastic foaming agent. In the invention, the injection system and the injection method of the CO2 plastic foaming agent can completely meet the technological requirements on component proportions, accurate metering, intermittent and stable injection and the like required by the CO2 foaming agent.

Description

technical field [0001] The present invention relates to CO 2 A method for preparing a plastic foaming agent and a system for injecting the plastic foaming agent. Background technique [0002] At present, the consumption of polystyrene (PS) in the world is huge, and the annual consumption in the United States alone reaches more than 3 million tons. In the manufacturing process of PS foam sheet extrusion, the traditional blowing agents used are freon and chain hydrocarbons. Freon can cause global warming and ozone layer depletion, and is banned by the international community; and chain hydrocarbons are flammable, which affects production safety. [0003] CO 2 Non-flammable, which increases the safety of production; does not deplete the ozone layer, and has little impact on global warming (the global warming potential of HCFC-22 is about CO 2 1700 times that of CFC-12 is about CO 2 5800 times of that); cheap, small amount, easy to recycle, economical and practical; non-tox...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a CO 2 Preparation method of plastic blowing agent and CO 2 Plastic foaming agent injection system: it solves the problem of low decomposition degree and high diffusion degree of carbon dioxide entering the body and melt, which makes it difficult to mix with the melt or uneven mixing, which makes it impossible to produce qualified products normally, and CO 2 Affected by the ambient temperature and unstable pressure during the injection process, it is easy to cause gasification or dry ice, resulting in CO 2 Unable to stably inject, unable to achieve the purpose of smooth foaming, etc.

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