| 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 final purpose. For unmatched elasticity, opt for natural rubber. For robust oil resistance, nitrile rubber is your best bet. When facing high temperatures, rely on the steadfast durability of silicone rubber.
2. Compound Agent Dispensing
Enhance your rubber's performance by adding a meticulously measured concoction of vulcanizers like sulfur or peroxide, promoters, anti-aging agents, and fillers such as carbon black or white carbon black. Precision is key—ensure the weighing is accurate to an error margin of just 0.1%.
3. Treatment of Reinforcement Materials
Prepare the skeletal materials, be it steel wire or fiber, by first soaking them in rubber and then drying at a controlled temperature of 60-70°C. This crucial step significantly bolsters the binding strength with rubber.
2. Plastic Refining Process
Enhance the plasticity of raw glue by reducing its molecular weight. This can be achieved through mechanical extrusion with an opening machine or by thermal oxidative degradation with a compacting machine.
1. Mechanical Plastic Smelting: Maintain a consistent temperature of 60°C to ensure viscosity is reduced to below 60.
2. Thermoplastic Refining: Optimal for natural rubber pretreatment, this method introduces compressed air for superior blending.
3. Mixed Refining Process
Achieve homogeneous blending by uniformly dispersing materials in the rubber refining machine, resulting in a mixed rubber of consistent quality and properties.
Key control points: Maintain a precise temperature (≤120°C), adhere to the optimal time span (5-15 minutes), and ensure the roll distance is between 1-3mm.
Customized adjustments:
1. For products demanding exceptional wear resistance, elevate the carbon black content to 40-50 parts by weight for enhanced durability.
2. For products that need to withstand high temperatures, incorporate zinc oxide (5-8 parts by weight) and a silane coupling agent for superior thermal 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 |
Discover the diverse world of rubber materials and their unique characteristics, each tailored to meet specific demands.
| 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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