The formation process of blow molded products needs to add several kinds of agents

Author: MULAN -Plastic Molding Manufacturer

Foaming agent The auxiliary agent used in the polymer compounding system to obtain a polymer product with a microporous structure by releasing gas to reduce the apparent density of the product is called a foaming agent. According to the different ways of generating gas during the foaming process, the foaming agent for blow molding products can be divided into two main types: physical foaming agent and chemical foaming agent. Physical blowing agents generally rely on changes in their physical state to release gas, mostly volatile liquid substances. Hydrochlorofluorocarbons (such as Freon), low alkanes (such as pentane) and compressed gases are representatives of physical blowing agents. Chemical foaming agents are based on the gas released by chemical decomposition for foaming. According to the structure, they are divided into inorganic chemical foaming agents and organic chemical foaming agents. Inorganic foaming agents are mainly heat-sensitive carbonates (such as sodium carbonate, ammonium bicarbonate, etc.), nitrites and borohydride compounds, which are characterized by endothermic foaming process, also known as endothermic foaming agents. foaming agent. Organic foaming agents have a very prominent position in the plastic foaming agent market. Representative varieties include azo compounds, N—Nitroso compounds and sulfonyl hydrazide compounds, etc. The foaming process of organic blowing agents is often accompanied by exothermic reactions, and is also known as exothermic blowing agents. In addition, some auxiliary agents that can adjust the decomposition temperature of the blowing agent, that is, foaming aids, are also included in the list of blowing agents. antistatic agent The function of antistatic agent is to reduce the surface resistance of polymer products and eliminate the electrostatic hazards that may be caused by static electricity accumulation. According to the different ways of use, antistatic agents for blow molded products can be divided into two types: internal addition type and coating type. The internal antistatic agent is added or blended into the plastic formula, and after molding, it migrates from the interior of the product to the surface or forms a conductive network, thereby achieving the purpose of reducing surface resistance and discharging charges. Coating-type antistatic agents are attached to the surface of plastic products by coating or wetting, thereby absorbing moisture in the environment and forming an electrolyte layer that can discharge charges. From the perspective of the composition of chemical substances, traditional antistatic agents almost without exception belong to surfactant compounds, including quaternary ammonium salt cationic surfactants, alkylsulfonate anionic surfactants, alkanolamines, Nonionic surfactants such as alkanolamides and polyol fatty acid esters, etc. However, emerging high molecular weight permanent antistatic agents”Breaking this convention, they are generally hydrophilic block copolymers that cooperate with the base resin in the form of a blended alloy to conduct charges by forming conductive channels. Compared with surfactant-based antistatic agents, this high-molecular-weight permanent antistatic agent will not be lost due to migration, volatilization and extraction, so the antistatic property is durable and stable, and is rarely affected by ambient humidity. antifungal agent Antifungal agent, also known as microbial inhibitor, is a kind of stabilizing agent that inhibits the growth of microorganisms such as mold and prevents polymer resins from being eroded by microorganisms and degraded. The vast majority of blow molded products are not sensitive to mold, but they have mold susceptibility due to the addition of plasticizers, lubricants, fatty acid soaps and other substances that can breed mold during processing. Antifungal agents for plastics contain many chemical substances, and the more common ones include organic metal compounds (such as organic mercury, organic tin, organic copper, organic arsenic, etc.), nitrogen-containing organic compounds, sulfur-containing organic compounds, and halogen-containing organic compounds. and phenolic derivatives, etc. brightener Fluorescent brightener (fluorescent brightener) is a fluorescent dye, or white dye, and is also a complex organic compound. Its characteristic is that it can excite the incident light to produce fluorescence, so that the dyed substance can obtain a sparkling effect similar to fluorite, and make the blow molded products very white seen by the naked eye.