| 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
Select the perfect type of raw rubber based on the product's intended application. Options include natural rubber for superior elasticity, nitrile rubber for unmatched oil resistance, and silicone rubber for high-temperature endurance.
2. Compound Agent Dispensing
Carefully add essential elements like vulcanizers (sulfur or peroxide), promoters, anti-aging agents, and fillers (carbon black or white carbon black). Achieve precise performance customization with accurate weighing, maintaining an error margin of just 0.1%.
3. Treatment of Reinforcement Materials
Enhance binding strength by pretreating skeletal materials like steel wire or fiber. This involves soaking in rubber and drying at a controlled 60-70°C to ensure maximum integration with the rubber matrix.
2. Plastic Refining Process
Enhance plasticity by reducing the molecular weight of the raw glue. Utilize mechanical extrusion (via an opening machine) or thermal oxidative degradation (using a compacting machine).
1. Mechanical Plastic Smelting: Perfect the consistency by maintaining a specific temperature of 60°C and reducing viscosity to below 60.
2. Thermoplastic Refining: Ideal for natural rubber pretreatment, with the introduction of compressed air for optimum results.
3. Mixed Refining Process
Ensure a perfectly uniform dispersion of the mixture in the rubber refining machine, resulting in a mixed rubber with consistently reliable properties.
Key control points: carefully regulate the temperature (≤120°C), processing time (5-15 minutes), and roll distance (1-3mm) for optimal outcomes.
Customized adjustments:
1. High wear-resistant products: Enhance durability by increasing the carbon black content to 40-50 parts by weight.
2. High temperature resistant products: Bolster resilience with the addition of zinc oxide (5-8 parts by weight) and a 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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