PVC antistatic agent
when the higher temperature or heating time is longer, will emerge hydrogen chloride, the formation of a double bond and a small amount of crosslinking keys, make plastic melt darker color, viscosity rise, will happen at the same time contact with oxygen hot oxygen degradation. Alkaline will react with the anti-static agent is added to. Antistatic agent fails, almost all of the antistatic agent can increase the PVC crosslinking and dehydrochlorination speed, and accordingly reduce the thermal stability of PVC plastic. Therefore request antistatic agent in the injection molding processing temperature non-volatile, don't break down, as well as the thermal decomposition of no.
antistatic agent to the plastic surface migration mainly by means of polymer chain segment molecular motion, and the glass transition temperature of polymer compounds directly affect the migration velocity of antistatic agent molecules. Polyvinyl chloride (PVC) glass transition temperature is 87 ℃, higher than the room temperature, at room temperature when using high polymer chain segment in the frozen state, it is difficult to migrate to the surface antistatic agent molecules. Surface of antistatic agent hours later, the internal antistatic agent molecules go through a long cross to migrate to the surface of plastic antistatic agent, the antistatic effect undulate of ups and downs.
how to solve the PVC antistatic property of continuous uniform, is everyone to consider problem. Soft PVC antistatic agent is rigid and semi-rigid PVC antistatic agent is developed. Because of the large soft polyvinyl chloride (PVC) containing plasticizers, he is a transferable carrier agent, help antistatic agent migration to the surface. And solve the rigid and semi-rigid PVC electrostatic problem, need for formula research.
different injection molding products processing to use different antistatic agent to receive effective results. Polyvinyl chloride (PVC) plastic has its particularity, relative to other resin, its antistatic agent research more difficult. Polyvinyl chloride (PVC) many of the macromolecular chain end group is the initiator of the residue, make more than half of the end group contain a double bond, allyl chloride atoms unstable. Each contains multiple branched chain, PVC macromolecule chain branched chain key contact on chlorine atoms are unstable.
anionic stabilizers such as metal soap with cationic antistatic agent easily when compound each other, influence antistatic effect, also reducing product stability, pigment dispersion, inorganic filler adsorption of antistatic agent will also affect the effect of antistatic agent. And lubrication of antistatic agent itself make resin plasticizing delay ageing effect makes the resin at low temperature decomposition and thus to solve the relationship between good antistatic agent and other additives.
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