Innovative technologies for the recycling of waste foam

Using waste foam as insulation material

With the development of the chemical industry, the use of polystyrene foam as a packaging material, disposable tableware, etc. has shifted to the more promising market for building insulation materials. The defoamed waste polystyrene foam is added with a certain amount of low-boiling liquid modifiers, foaming agents, catalysts, stabilizers, etc., and the polystyrene beads can be pre-foamed by heating and then heated in the mold A rigid polystyrene foam plate with fine closed cells was prepared. This kind of plate can be used alone, or it can be made of thin aluminum plate and then made into aluminum plastic plate after forming. Its thermal insulation performance is very good. After the actual test of the roof of the house, the result is no frost and condensation, and the construction cost can be reduced, and the construction operation is convenient. Therefore, in the northern heating area, the polystyrene foam insulation board produced by this law has a wide range of uses and good prospects for development.

Preparation of waterproof coating using waste foam

By modifying the waste foam with a suitable modifier, a water-moisture waterproof coating with a normal temperature, quick-drying and long-time water resistance can be prepared. The process is simple, and water viscosity is also very convenient for construction. The waterproof coating can be used instead of moisture-proof oil in corrugated boxes, and can also be used to waterproof fiberboards.

Using waste foam to make p-nitrobenzoic acid

Nitrobenzoic acid (PNBA) is mainly used in the manufacture of strong fibers, pesticides, dyes, resins, metal surface rust inhibitors, sunscreens, color film couplers and filters and many other products. The waste foam can be obtained by nitration and oxidation. The use of this method has the advantages of easy availability of raw materials, simple technology, high value-added products, and is suitable for promotion in township enterprises.

Separation of styrene using waste foam

There are three methods for the production of styrene by the cracking of waste foams, namely thermal cracking, catalytic cracking and anaerobic catalytic cracking, and finally the waste foam can be transformed into an important chemical raw material styrene.

At present, the reuse technology of waste plastics is constantly being researched and introduced. It is worth paying more attention and exploration to the use of waste plastics to modify and produce building materials.

China Plastics Industry Network