Many people doubt whether plastic furniture is unhealthy, but there are many kinds of plastic materials. Today we will focus on two kinds of general plastics.
(1) Polyethylene plastic (PE)
The raw material of polyethylene is ethylene, which is obtained by cracking petroleum. The appearance is milky white, odorless, non-toxic, with excellent low temperature resistance, chemical stability and processability. Its minimum temperature can reach - 70 ℃; it can resist most of the acid and alkali corrosion; it is insoluble in general solvents at room temperature and has little water absorption. The electrical insulation of polyethylene is also excellent. But the polarity of polyethylene is small, the surface properties are very low, so the dyeing and adhesion are very poor. In addition, its transparency and handle are not good, and its temperature resistance is not high.
(2) Polypropylene plastics (PP)
Polypropylene is the lowest relative density of general plastics, and its mechanical properties are better than polyethylene. It is non-toxic and tasteless, good heat resistance, and can be used at about 110 ℃ for a long time. Polypropylene resin has excellent resistance to twists and turns. Oriented tensile polypropylene can withstand 1 million twists and turns without breaking. It is often used to make hinges for stationery boxes and instrument boxes. After toughened by glass fiber or elastomer, the impact strength of polypropylene resin will be greatly improved, which can be used as engineering plastics, such as automobile bumper. However, polypropylene resin is easy to age when exposed to sunlight or copper, and then becomes brittle at low temperature. The aging of polypropylene resin can be prevented or delayed by adding antioxidant and anti ultraviolet agent.
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