Various additives are used in combination with rubber, plastic, etc. The moisture contained in these additives or the gas inhaled during the mixing process will cause bubbles, surface defects, and dimensional instability. This product is properly compounded to completely remove moisture or gas in the raw material complex, and it is a drug developed to obtain an excellent product without air bubbles. It is called Hygroscopic Agent. Using this product can reduce costs, improve quality, and reduce adverse effects.
Application Skills of Hygroscopic Agent CAO in EPDM Adhesive Strips
Calcium oxide absorbs moisture quickly, and the rubber compound added with calcium oxide should not be parked for too long, otherwise calcium oxide will lose its moisture absorption effect. When EPDM sealing strip manufacturers use hygroscopic agents, calcium oxide needs to be strictly sealed during transportation and storage. Generally, additives such as paraffin oil are used to treat or coat the surface of Hygroscopic Agent Masterbatch For Rubber calcium oxide to reduce calcium oxide. Moisture absorption speed, improve storage safety.
The Relationship Between The Amount of Calcium Oxide And The Mechanical Properties of Sealing Strips
Calcium oxide has poor dispersion and reinforcing properties in the rubber compound. During use, it will compete with zinc oxide for accelerators to form non-vulcanizing active substances, which will reduce the cross-linking density of the rubber compound and limit the increase in the cross-linking density, resulting in Compression permanent deformation increases, which affects the sealing performance and service life of EPDM sealing strips.
Therefore, the amount of calcium oxide in the EPDM sealant should not be too large, as long as it meets the requirements of moisture absorption performance, so as to ensure the physical and mechanical properties of the sealant and the resilience of the sealant.
Masterbatch Hygroscopic Agent has poor dispersion and reinforcing performance in the rubber compound. During use, it will compete with zinc oxide for accelerators to form non-vulcanization active substances, which will reduce the cross-linking density of the rubber compound and limit the increase of the cross-linking density, resulting in The compression permanent deformation of the material increases, which affects the sealing performance and service life of the EPDM sealing strip.
Therefore, the amount of calcium oxide in the EPDM sealant should not be too large, as long as it meets the requirements of moisture absorption performance, so as to ensure the physical and mechanical properties of the sealant and the resilience of the sealant.