Customization: | Available |
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Material: | Polyurethane Rubber |
Application: | Machinery |
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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 |
Comparison of key performance parameters
index | NR | NBR | FKM | SIR | EPDM |
Temperature resistance range | -60~100ºC | -25~130ºC | -20~250ºC | -70~300ºC | -60~150ºC |
oil resistivity | insufficient | excellent(NBR40) | extremely excellent | insufficient | insufficient |
ozone resistance | insufficient | insufficient | excellent | excellent | excellent |
abrasion performance | excellent | middle | middle | insufficient | excellent |
Electric insulation | excellent | insufficient | insufficient | excellent | excellent |
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) |