| Customization: | Available |
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| Material: | Bakelite |
| Application: | Medical, Household, Electronics, Automotive, Agricultural |
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1. Raw Material Preparation and Pretreatment
1. Main Material Selection
Choose the quintessential raw rubber based on the end product's application, whether it demands the remarkable elasticity of natural rubber, the robust oil resistance of nitrile rubber, or the superior high-temperature endurance of silicone rubber.
2. Compound Agent Dispensing
Precisely incorporate vulcanizers such as sulfur or peroxides, along with promoters, anti-aging agents, and fillers like carbon black or white carbon black. Each element is meticulously measured to a precision of 0.1% to engineer the desired product performance.
3. Treatment of Reinforcement Materials
Enhance the integration of skeletal materials, whether steel wire or fiber, by pre-soaking them in rubber and drying at 60-70°C. This process fortifies the bond between the reinforcement and rubber.
2. Plastic Refining Process
Through the ingenuity of mechanical extrusion using opening machines or thermal oxidative degradation via compacting machines, the molecular weight of raw glue is skillfully reduced, enhancing its plasticity.
1. Mechanical Plastic Smelting: Maintain a precise temperature of 60°C to effectively decrease viscosity below 60, optimizing malleability.
2. Thermoplastic Refining: Ideally suited for natural rubber pretreatment, this process introduces compressed air to refine the material.
3. Mixed Refining Process
Ensure a flawless and uniform distribution of the mixture within the rubber refining machine, resulting in a harmoniously mixed rubber with consistent, reliable properties.
Key control points: Rigorously manage temperature (≤120°C), time (5-15 minutes), and roll distance (1-3mm) for optimal refinement.
Customized adjustments:
1. For high wear-resistant products: Elevate the carbon black content to a robust 40-50 parts by weight.
2. For high temperature resistant products: Integrate zinc oxide (5-8 parts by weight) and a silane coupling agent to fortify resilience.
3. For the moulding process:
| Placement forming | Suitable for rubber plates and sealing strips, it is necessary to control the adhesive thickness tolerance within ± 0.1mm. |
| Extrusion and shaping | For the hose and sealing ring, the design of the mouth die directly affects the accuracy of the section. |
| Modular pressure molding | Metal-rubber composite molds should be used for complex structures. |
| Injection molding | Complex structural parts are multi-material composite components |
Rubber materials and characteristics
| native rubber(NR) | High elasticity (tensile strength 20-25MPa), wear resistance, tear resistance, but poor oil resistance and ozone resistance |
| styrene-butadiene rubber(SBR) | Excellent wear resistance (low cost), but the elasticity, tear resistance is weaker than natural rubber |
| butadiene rubber(BR) | Outstanding cold resistance (-70ºC is still elastic), wear resistance, but low strength, poor tear resistance |
| Ding eyes rubber(NBR) | Excellent oil resistance (mineral oil, lubricating oil), low compression permanent deformation, but poor low temperature resistance |
| ethylene-propylene rubber(EPDM) | Optimal weather resistance, ozone resistance, high temperature resistance (150ºC), good electrical insulation, but poor oil resistance |
| chloroprene rubber(CR) | Good aging resistance, ozone resistance and flame retardant, but poor low temperature performance (brittle below-30ºC) |
| silastic(VMQ) | Temperature resistance range (-70~300ºC), excellent biocompatibility, but low mechanical strength |
| fluorine(-containing)rubber(FKM) | High temperature resistance (250ºC), strong acid and alkali resistance, oil resistance, but poor air permeability, high processing difficulty |
| hydrogenated butadiene-acrylonitrile rubber (HNBR) | Oil resistance, high temperature resistance is better than ordinary NBR, wear resistance is strong |
| chlorosulfonated polyethylene(CSM) | Resistance to strong acid and strong alkali (such as concentrated sulfuric acid), ozone resistance, but poor oil resistance |
| urethane rubber(PU) | Excellent wear resistance (high Shaw hardness), tear resistance, but poor oil resistance, weak weather resistance |
| acrylic rubber(ACM) | High temperature resistance (200ºC), oil resistance (such as ester lubricating oil), but poor cold resistance |
Suggestions for type selection
| Oil resistance scene | Nitrile rubber (NBR) or fluorine rubber (FKM) is preferred |
| hot environment | Silicone rubber (VMQ) or fluorine rubber (FKM) |
| resistance to chemical attack | Chlorosulfated polyethylene (CSM) or fluorine rubber (FKM) |
| dynamic packing | Ethpropylene rubber (EPDM) or polyurethane rubber (PU) |
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