Rubber-Introduction橡胶简介.pptVIP

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Rubber-Introduction橡胶简介.ppt

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Rubber-Introduction橡胶简介.ppt

Vulcanization requires some combinationof Heat, Pressure and Time. Vulcanization, curing, or crosslinking,is an irreversible chemical reaction by which the polymer chains in a mixture are “chemically bonded together” at various points, resulting in a material that is tough and elastic. Vulcanization can take place in a heated press, autoclave, hot air oven, fluidized bed, or salt bath, using electricity, hot oil, steam, microwaves, infrared, or UV radiation for heat. Definition of Vulcanization Before vulcanization After vulcanization s s s s s s s s s s During vulcanization s s s s Crosslinking Diagram Hardness Tensile Strength Elongation Heat Aging Resistance Oil/fuel Resistance Low temperature flexibility Abrasion resistance … Rubber properties after curing Key factor which impact cured rubber properties Compound Formula Compound Mixing Curing element: Temperature, Pressure, Time - Crosslink density CLASSIFICATION OF COMPOUNDING INGREDIENTS 2) FILLERS PHR 100 20 - 300 1) ELASTOMER 8) ACCELERATORS 7) CURATIVES 3) PLASTICIZERS 6) ACTIVATORS 5) PROCESS AIDS 0 - 175 1 - 10 0 - 10 4) ANTIDEGRADANTS 0 - 6 .75 - 10 2 - 8 Compound Formula Compound Mixing Curing element: Temperature, Pressure, Time - Crosslink density CLASSIFICATION OF COMPOUNDING INGREDIENTS 2) FILLERS PHR 100 20 - 300 1) ELASTOMER 8) ACCELERATORS 7) CURATIVES 3) PLASTICIZERS 6) ACTIVATORS 5) PROCESS AIDS 0 - 175 1 - 10 0 - 10 4) ANTIDEGRADANTS 0 - 6 .75 - 10 2 - 8 Tensile Strength Static Dynamic Stiffness (Ks, Kd) Tear Strength Abrasion Resistance Fatigue Resistance (Durability) Filler Performance 填料的作用 CLASSIFICATION OF COMPOUNDING INGREDIENTS 2) FILLERS PHR 100 20 - 300 1) ELASTOMER 8) ACCELERATORS 7) CURATIVES 3) PLASTICIZERS 6) ACTIVATORS 5) PROCESS AIDS 0 - 175 1 - 10 0 - 10 4) ANTIDEGRADANTS 0 - 6 .75 - 10 2 - 8 Aid Mixing Modify Viscosity Produce Tack Modify Low Temperature Flex Lower Static Dynamic Stiffness (NVH) Plasticize