Difference among ordinary vulcanized rubber powder and powdered rubber In the rubber industry, vulcanized rubber powder and powdered rubber are two commonly used powder materials. Vulcanized rubber powder is mostly made from waste vulcanized rubber through mechanical crushing, which retains cross-linked fragments and residual sulfur bonds. Powdered rubber is mostly made of unvulcanized raw rubber directly powdered, maintaining linear macromolecular chain characteristics. There are obvious differences among vulcanized rubber powder and powdered rubber in raw materials, production processes, molecular structure, performance characteristics and application fields.
1. Raw materials and processes
The main raw material of ordinary vulcanized rubber powder is waste rubber products, mainly waste tires, crushed or ground by mechanical processing to make powdery substances of different particle sizes, commonly used crushing methods such as room temperature crushing, freezing or room temperature chemical method, etc. Common vulcanized rubber powders on the market include tire rubber powder, nitrile rubber powder, EPDM rubber powder, etc.
Powder rubber is unvulcanized rubber raw materials, such as nitrile rubber, styrene-butadiene rubber; The production methods of powder rubber are roughly divided into two categories: one is directly using rubber latex or solution as raw material, and the other is crushing E5LYY310 using finished lump rubber as raw material. The production process of powder rubber includes mechanical crushing at room temperature, spray drying into powder, freezing crushing, grafting co-coagulation method, etc. The only varieties of powder rubber produced from rubber production are powder nitrile rubber and powder neoprene, powder styrene-butadiene rubber and powder ethylene propylene rubber are crushed by lump glue.
2. Molecular structure and performance characteristics
In terms of microstructure, ordinary vulcanized rubber powder is a fragment of cross-linked network structure, containing a small amount of unsaturated double bonds, with re-crosslinking function, can be used in conjunction with other polymer materials, inheriting the elastic characteristics of rubber itself, with certain wear resistance, small density, low modulus, can be used with rubber and other polymer materials to prepare new materials, reduce the pollution of waste rubber to the environment, and reduce manufacturing costs.
Powder rubber is an unvulcanized rubber raw material with a macromolecular chain structure, which does not change the physical and chemical properties of the original raw rubber, but only changes the shape of the rubber product. Powder rubber has good fluidity and processing performance, easy to realize production automation, reduce energy consumption, convenient processing, save manpower, some powder rubber also has anti-aging, anti-cracking, oil resistance, wear resistance, anti-slip, high temperature resistance and other performance characteristics.
3. Application field
Ordinary vulcanized rubber powder is mostly used as an extender in the production of rubber products, reducing production costs, improving rubber processing performance, improving the fatigue resistance of rubber products, etc., such as the tread and sidewall rubber of loaded tires mixed with 5% rubber powder, which can effectively improve the tire mileage; Vulcanized rubber powder is used for plastic modification, which can play a role in increasing elasticity and toughness, and improving the impact resistance of plastics. Or as asphalt modification, concrete modification, etc., rubber powder and asphalt mixed to lay the pavement, which can reduce the softening deformation and cracking of the pavement.
Powder rubber is used in the same way as the corresponding lump rubber, and is widely used in the production of rubber products and polymer modification. However, because the material is in powder form, it is especially suitable for making injection and extrusion products, such as hoses, cable jackets, rubber plates and various molded products. Or used as PVC toughening modification, resin modifier, adhesive, plasticizer, etc.
There is a big difference among vulcanized rubber powder and powdered rubber in all aspects, and when modifying rubber products and polymer materials, choose the appropriate vulcanized rubber powder and powder rubber according to actual needs.
Black and white nitrile recycled rubber powder is a fluid powder, with an average particle size of 0.12mm, a specific gravity of about 0.93, and a medium viscosity. It has the characteristics of heat and cold resistance, wear resistance and anti-slip, solvent resistance, and strong kneading resistance, which can prevent plasticizer penetration, small compression permanent deformation of rubber products, and maintain the performance of the original material for a long time. significantly improve the physical properties and chemical resistance of rubber; The compatibility is excellent, the melt stability of the polymer is extremely high, and the processing performance of rubber and plastic alloy products can be used, such as injection molding, extrusion, calendering, blow molding, etc., and can also be used as filling and modifying materials for paint coatings.
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