| 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 ideal type of raw rubber based on the product's purpose: whether it’s natural rubber for unparalleled elasticity, nitrile rubber for superior oil resistance, or silicone rubber to withstand high temperatures, ensuring your products perform flawlessly.
2. Compound Agent Dispensing
Precisely add a blend of vulcanizing agents (sulfur or peroxide), promoters, anti-aging agents, and fillers like carbon or white carbon black. Customize the performance with exceptional precision, maintaining an weighing error of just 0.1%.
3. Treatment of Reinforcement Materials
Enhance the binding strength of the skeletal material—be it steel wire or fiber—by expertly soaking it in rubber and drying it at a consistent 60-70°C.
2. Plastic Refining Process
Increase plasticity by lowering the molecular weight of raw glue via mechanical extrusion or thermal oxidative degradation, utilizing advanced machinery like opening or compacting machines.
1. Mechanical Plastic Smelting: Sustain a temperature of 60°C and ensure viscosity is reduced to below 60 for optimal results.
2. Thermoplastic Refining: Ideal for natural rubber pretreatment, this method effectively incorporates compressed air for enhanced processing.
3. Mixed Refining Process
Achieve uniform dispersion and consistent properties in your mixed rubber using a state-of-the-art rubber refining machine.
Key control points: Maintain a precise temperature of ≤120°C, control the time to a brief 5-15 minutes, and set roll distance to a precise 1-3mm.
Customized adjustments:
1. For high wear-resistant products: Enhance durability by increasing carbon black content to 40-50 parts by weight.
2. For high temperature resistant products: Fortify resilience by adding 5-8 parts by weight of zinc oxide and a reliable silane coupling agent.
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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