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What Is The Principle Of ADC Blowing Agents?

Weifang Yaxing Chemical Co.,Ltd | Updated: Aug 02, 2017

What is the principle of ADC Blowing Agents?
 ADC Blowing Agents is divided into two categories, chemical ADC Blowing Agents and physical ADC Blowing Agents. Chemical ADC Blowing Agents is decomposed at high temperature to form gaseous decomposition products (N2, CO2, NH3, etc.) organic and inorganic. This decomposition process is usually exothermic and irreversible. The physical ADC Blowing Agents may be a liquid or a substance that has been vaporized under normal conditions. Physical ADC Blowing Agentss include aliphatic, hydrocarbon (pentane, hexane, decane, etc.). Chlorinated hydrocarbons (chloromethane, dichloromethane, etc.). Chlorine-fluorocarbon compounds (trichloromonofluoromethane, dichlorodifluoromethane, etc.), N2, CO2 rare gases and air.
Conventional physical foaming refers to the mixing of the physical ADC Blowing Agents with the resin matrix, and by changing the conditions during the operation, the ADC Blowing Agents is physically changed according to the principle of thermodynamic instability, and the process of generating bubbles is generated.
Chemical ADC Blowing Agents, heat decomposition or chemical reaction between the raw materials generated by the chemical, chemical ADC blowing agent in the heating of the release of gas are carbon dioxide, nitrogen, ammonia and so on.
ADC Blowing Agentss for microporous foams are generally classified into both physical and chemical types, depending on whether the gas is produced by physical processes (ie, volatile or sublimed) or chemical processes (ie, destruction of chemical structures or Other chemical reactions).
(1) physical ADC Blowing Agents
Physical ADC Blowing Agentss are generally low boiling liquids or gases that can be dissolved in the polymer matrix. When the temperature of the system is increased and / or the pressure of the system is reduced, the physical ADC Blowing Agents is boiled to exert their foaming action.
The chemical properties and deformation properties of the polymer system determine the type of physical promoter that can be used.
(2) Chemical ADC Blowing Agents
In hot homogeneous materials, chemical foaming is often achieved by chain growth and cross-linking reactions to form volatile by-products, such as in polyurethanes, phenolic and aminoplasts. In contrast, for thermoplastics, the chemical stopper is made by means of a compatible or very fine dispersion of the chemical, at a temperature above the polymer ingredient temperature, but within a relatively narrow temperature range of the processing temperature range, The rate of decomposition and complete.
The most important chemical ADC used in industry is the release of nitrogen as the main gas component of the compound. In addition, the decomposition reaction can sometimes be catalyzed or inhibited, so that in a defined formulation, the foaming rate may be adjusted to accommodate the particular processing conditions (pressure, temperature and time) employed.
ADC Blowing Agents is the most commonly used ADC Blowing Agents in the plastics processing industry. Decomposition of the release of nitrogen, especially for the loss of gas in the closed structure of the product. ADC Blowing Agents is not combustion and self-extinguishing, non-toxic, non-polluting, do not change color, insoluble in the general plasticizer. Performance ADC Blowing Agents AC is yellow powder, but the decomposition residue is white, so it can be used in white or light-colored products. ADC Blowing Agents AC itself is odorless, decomposition products are also odorless. Decomposition of gas containing N, CO, CO and a small amount of nitrogen, ADC Blowing Agents AC technical indicators in the following table: Indicator ADC blowing agent decomposition temperature (℃) 201-205 gas volume (ml / g) 215-225 moisture content ( %) 0.3max Average fineness (μm) 14-17 The decomposition temperature of the ADC Blowing Agents is high, and the decomposition temperature can be reduced from 200 ° C to 150-190 ° C by adding the activator. Commonly used activators include metal salts containing zinc, lead, barium and cadmium, zinc oxide, zinc stearate, organometallic compounds, diols and treated urea auxiliaries. Application of ADC Blowing Agents is widely used in polymer foam processing. Can be used to manufacture tool handles, furniture, auto parts, closed-cell leather, flooring, wallpaper, carpet pads, seals and soles. Storage and processing Note that the ADC Blowing Agents is stable, non-combustible and self-extinguishing. Placed in a ventilated, dry, away from the heat source to save. Save for more than 12 months. Otherwise there will be caking phenomenon. Easy to produce dust when processing, processing sites should be well ventilated, to avoid inhalation of dust and prolonged contact with the skin. Only to meet the fire will burn, leave the flame, AC will automatically extinguish, but more will support the combustion. Can use water, foam. CO2 fire extinguishing.