Vulcanized rubber powder processed from waste rubber products is widely used in rubber, plastics, building materials, road transportation and other fields. Among them, the application in rubber and rubber products can be roughly divided into two categories: direct processing and molding to produce rubber products; Used in rubber to produce rubber products. In actual production, the vulcanized rubber powder is directly processed and formed, the production process of rubber products is simpler and the cost is low, and it is widely used in the production of medium and low-grade rubber products.
1. Rubber powder direct vulcanization molding process
The vulcanized rubber powder made by crushing waste rubber products retains the cross-linked structure of the vulcanized rubber, and some uncross-linked unsaturated bonds remaining in the macromolecular segment can still be cross-linked with a cross-linking agent. In actual production, the rubber powder can be directly vulcanized into rubber products with various shapes and meeting the basic performance requirements by adding vulcanizing agent or accelerator, or vulcanizing with peroxide and mixing with an appropriate amount of plasticizer, so as to effectively reduce the raw material cost and production energy consumption of the products.
2. Advantages and disadvantages of rubber powder direct molding
In actual production, vulcanized rubber powder direct molding has the characteristics of less dosage of compounding agent, simple process and low manufacturing cost. It should be noted that rubber products directly formed with rubber powder have low mechanical properties and low production efficiency. They are generally used to produce medium and low-grade rubber products. With the development of rubber powder modification and molding processing technology and the super refinement of rubber powder, the limitation of direct molding application of rubber powder will be broken, and the production efficiency is expected to be improved, or it will be used in the production of high-performance rubber products.
3. Application examples of rubber powder direct molding
At present, rubber powder direct vulcanization molding is mostly used in the production of rubber products such as mechanical gaskets, cushion pads, mudguards and sound-absorbing materials, among which the amount of cushion pads under the railway track is very large. In actual production, rubber powder direct molding can also manufacture various color products. Generally, double-layer composite process is adopted. A thin colored rubber plastic film is composite molded or laminated on the rubber products to cover up the black and make decorative plates of various colors.
Rubber products directly molded with rubber powder can also adopt special processes to make their surface rough and prevent slipping, which can be used in floor paving materials. In actual production, with the continuous progress of vulcanized rubber powder production process, modification process and molding process, the application field of rubber powder direct vulcanization molding is more and more extensive; Continuous in-depth research on the direct vulcanization of rubber powder to produce rubber products is of great significance to solve the environmental pollution of waste rubber, realize the recycling of waste rubber, reduce the production cost of rubber products and improve economic benefits.
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