Cao su EPDM là một loại cao su tổng hợp thông dụng, thường được dùng trong các ứng dụng ngoài trời. Bên cạnh thành phần cao su, hệ kết mạng, chất độn, thành phần chất hóa dẻo và trợ gia công cũng ảnh hưởng đáng kể đến tính chất của cao su EPDM. Phần tài liệu sau sẽ giới thiệu khái quát vấn đề này.

Naphthenic oils have been the most widely used plasticizers for EPDM compounds because they provide the best compatibility at reasonable cost. For applications at higher temperatures or in colored compounds, paraffinic oils are usually chosen because of their lower volatility and improved UV stability. Some paraffinic oils tend to bleed from cured, high-ethylene EPDM compounds. If such oils must be used, it is usually advisable to replace part (20-25 phr) of the high-ethylene rubber with one having somewhat lower ethylene content.

Aromatic oils have an adverse effect on some compound properties and, of course, must not be used in conjunction with peroxide curing systems.

Stearic acid, zinc stearate, or other internal lubricants are often included in a compound to aid processing.

EPDM compounds are inherently not tacky. Should there be a need for building tack, it would be necessary to add a tackifier to the compound. Some care must be taken in making the selection because of compatibility problems and the effects on cure rate of tackifiers with excessive unsaturates. Some tackifiers have been developed specifically for EPDM. Suggestions in EPDM and tackifier manufacturers' literature should be used as a guide for specific problems involving tack.

Trích đăng từ sách Rubber Technology, Third Edition, Maurice Morton, Springer, 1999, trang 273


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