Compared with reclaimed rubber of the same volume or weight, the processing of waste rubber and products into reclaimed rubber powder can save about 40% of power consumption, which is of great significance to energy conservation, water conservation, and reduction of environmental pollution. With the continuous progress of the production process of reclaimed rubber powder and the continuous expansion of the scope of application, the activated rubber powder after surface modification has become more and more important in rubber and plastic products. Why? What is the reason for surface modification of reclaimed rubber powder? What methods are currently available to modify the surface of reclaimed rubber powder?
1. The significance of surface modification of reclaimed rubber powder
In addition to rubber, the main components of reclaimed rubber powder also include carbon black, softeners, vulcanization accelerators, etc. The surface is inert, which is different from the surface of rubber or plastics, and has poor compatibility. It is difficult to form directly mixed in rubber and plastic materials. A good bonding interface leads to a rapid decline in the mechanical strength of the product. The reclaimed rubber powder after surface modification has better interface bonding performance with other polymer materials, which can increase the amount of reclaimed rubber powder in rubber or plastic products and reduce more raw material costs.
Experiments show that the mixing amount of ordinary vulcanized rubber powder 2LLYY85 in rubber is generally controlled below 10%. After surface modification of reclaimed rubber powder, the mixing amount can be increased to 25%-50%; modified reclaimed rubber powder (activated rubber Powder) is mixed in a larger amount in plastics.
2. Surface modification method of reclaimed rubber powder
In the actual production and processing process, the reclaimed rubber powder modified by different modification methods has different uses in the rubber and plastics industry. The editor today will share with you the modification method of reclaimed rubber powder and the application of modified reclaimed rubber powder. Scope and role.
①Mechanical chemical modification: The reclaimed rubber powder treated by mechanochemical reaction can generally be used as the active filler of the rubber compound.
②Polymer coating modification: use polymers and other compounding agents to treat reclaimed rubber powder. The modified reclaimed rubber powder can improve the physical properties of the mixed rubber or plastic.
③Regeneration desulfurization modification: The reclaimed rubber powder treated with regeneration activator and microorganisms can be combined with raw rubber and reclaimed rubber to improve process performance and reduce production costs.
④Graft modification: Use styrene, vinyl polymer, etc. to graft modified reclaimed rubber powder, which can improve the physical properties of polystyrene and increase the compatibility between rubber powder and plastics and rubber. Reclaimed rubber powder can also use polyurethane and styrene initiators to make the rubber powder interpenetrate the polymer network to achieve the purpose of surface modification.
⑤Gas modification: Use active gases such as F₂, Cl₂, O₂, Br₂ or SO₂ to treat reclaimed rubber powder. The modified reclaimed rubber powder has better adhesion and compatibility with rubber and plastic.
⑥Core-shell modification: Use a special core-shell modifier to treat reclaimed rubber powder. The modified rubber powder has better compatibility with rubber and plastic.
⑦Sulphonation and chlorination reaction modification: The reclaimed rubber powder after surface modification by sulfonation or chlorination reaction can be used as an ion exchanger or used in conjunction with rubber.
⑧Physical radiation modification: use microwave or gamma rays to treat reclaimed rubber powder, and the modified rubber powder has better compatibility with rubber and plastic.
Compared with reclaimed rubber powder without surface modification, activated rubber powder has a wider range of applications in rubber and non-rubber fields. It has better application effects in tires, hoses, tapes, rubber shoes, and plastic products. While ensuring product quality and reducing more raw material costs, the editor will continue to share with you the application methods and techniques of activated rubber powder in various rubber and plastic products and other fields.
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