2022.03.29
1. Use waste foam plastic as thermal insulation material
With the development of the chemical industry, polystyrene foam has shifted from being used as packaging materials, disposable tableware, etc. to the more market-promising field of building insulation materials. The defoamed waste polystyrene foam is added to a certain dose of low-boiling liquid modifier, foaming agent, catalyst, stabilizer, etc., and the polystyrene beads can be pre-foamed by heating, and then heated in the mold A rigid polystyrene foam board with fine closed pores was prepared. This kind of board can be used alone, or it can be wrapped with a thin aluminum plate after forming to make an aluminum-plastic board. Its thermal insulation performance is very good, and it has been tested by the actual use of the roof of the house. As a result, there is no frost and condensation phenomenon, and the project cost can be reduced, and the construction and operation are convenient. Therefore, in the northern heating area, the polystyrene foam insulation board produced by this method has a wide range of uses and a good development prospect.
2. Use waste foam plastic to prepare waterproof coating
With suitable modifiers, the waste foam plastics can be modified to prepare water-emulsion waterproof coatings that are quick-drying at room temperature and water-resistant for a long time. The method is simple in process, and it is also very convenient to adjust the viscosity with water. The waterproof coating can be used for corrugated boxes instead of moisture-proof oil, and can also be used for waterproofing of fiberboard.
3. Utilize waste foam plastic to make p-nitrobenzoic acid
P-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 other products. The waste foam plastic can be obtained by nitrification and oxidation. Using this method has the advantages of easy availability of raw materials, simple process and high added value of products, and is suitable for promotion in township enterprises.
4. Using waste foam plastic to crack to produce styrene
There are three ways to produce styrene through the cracking of waste foam plastic, namely thermal cracking, catalytic cracking and anaerobic catalytic cracking, which can finally convert waste foam plastic into styrene, an important chemical raw material.
At present, the recycling technology of waste plastics is constantly being researched and launched, and the use of waste plastics to modify the production of building materials deserves more attention and exploration.
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