| Customization: | Available |
|---|---|
| Material: | Rubber |
| Application: | Medical, Household, Electronics, Automotive, Agricultural |
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1. Raw Material Preparation and Pretreatment
1. Main Material Selection
Depending on the product's intended use, select the appropriate type of raw rubber, such as natural rubber (for high elasticity), nitrile rubber (for oil resistance), silicone rubber (for high temperature resistance), etc.
2. Compound Agent Dispensing
Add vulcanizer (sulfur or peroxide), promoter, anti-aging agent, filler (carbon black or white carbon black), etc., and customize the performance by accurate weighing (with an error of 0.1%).
3. Treatment of Reinforcement Materials
The skeletal material (steel wire or fiber) should be pretreated by soaking in rubber and drying at 60-70°C to enhance the binding strength with the rubber.
2. Plastic Refining Process
Lower the molecular weight of the raw glue through mechanical extrusion (using an opening machine) or thermal oxidative degradation (using a compacting machine) to improve plasticity.
1. Mechanical Plastic Smelting: Maintain a temperature of 60°C and reduce the viscosity to below 60.
2. Thermoplastic Refining: Suitable for natural rubber pretreatment, introduce compressed air.
3. Mixed Refining Process
Uniformly disperse the mixture in the rubber refining machine to form a mixed rubber with consistent properties.
Key control points: temperature (≤120°C), time (5-15 minutes), and roll distance (1-3mm).
Customized adjustments:
1. For high wear-resistant products: increase the carbon black content to 40-50 parts by weight.
2. For high temperature resistant products: add 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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