PEGs: have good water-solubility even in its solid state; they are used as a releasing agent for foam rubber, latex rubber, etc. PEGs are also used as an airpack releasing agent, inner releasing agent, and lubricant in the tire industry. Link to Bar Chart. Overview
Polyethylene glycols used in rubber vary in molecular weight from 2000 to 8000 with the 4000 product covering virtually all normal applications.
PEG 3350 is an effective activator employed when compounding with silica fillers. PEG 3350 overcomes the retarding effect caused by various mineral pigments, improving both cure rate and state of cure.
PEG 3350 also functions as a process aid – lubricant in rubber compounds, which may otherwise be difficult to process. It is suitable for use in both Natural and Synthetic Rubber applications. Typical dosages range from 1.5 to 3.0 PHR.
In addition, PEG 3350 can add polarity to EPDM compounds to promote microwave curing.
PEG 4000 is an effective activator employed when compounding with silica and clay fillers. PEG 4000 overcomes the retarding effect caused by various mineral pigments, improving both cure rate and state of cure.
PEG 4000 also functions as a process aid in rubber compounds, which may otherwise be difficult to process. Lubrication and release of EPDM extrusions (including black-loaded compounds) is much improved. The presence of PEG 4000 in EPDM will also reduce accelerator bloom and iridescence due to the polarity added to the polymer. In addition, the polarity promotes microwave curing of EPDM.
PEG 4000 is suitable for use in all types of polymers using non-black fillers. Typical dosages range from 1.5 to 3.0 phr up to 4 phr is used in EPDM extrusions.
In addition, PEG 4000 can function as a mandrel or mold release for foam and mechanical goods.
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