As the pace of life accelerates, coffee paper cups are used more and more, so today we will talk about the relevant information of Coffee Cup PP Lids.
PP raw material, chemical name: polypropylene, features: low density, rigid strength, hardness and heat resistance are better than low-pressure polyethylene, can be used at about 100 degrees.
Polypropylene is a non-toxic, odorless, and tasteless milky white highly crystalline polymer, and its density is one of the lightest varieties of all plastics. It is particularly stable to water and has good moldability, but thick-walled products are easy to dent due to the large shrinkage rate (1%~2.5%), and the surface of the products has good gloss and is easy to color. Polypropylene has high crystallinity and regular structure, so it has excellent mechanical properties. The absolute value of the mechanical properties of polypropylene is higher than that of polyethylene, but it is still a low variety among plastic materials, and its tensile strength can only reach 30 MPa or a slightly higher level. Polypropylene with a larger isotactic index has higher stretch. Polypropylene has excellent resistance to bending fatigue, and its products can be bent 106 times at room temperature without damage.
But at room temperature and low temperature, due to its high molecular structure regularity, the impact strength is poor. The most prominent performance of polypropylene is its resistance to bending fatigue, commonly known as pleated rubber.
Polypropylene has good heat resistance, and the products can be sterilized at a temperature above 100°C, and will not deform at 150°C under the condition of no external force.
The chemical stability of polypropylene is very good. In addition to being corroded by concentrated sulfuric acid and concentrated nitric acid, it is relatively stable to other chemical reagents and has a good anti-corrosion effect.
It has a high dielectric coefficient and can be used to make heated electrical insulation products as the temperature rises. Its breakdown voltage is also very high, suitable for use as electrical accessories. Good resistance to voltage and arc.
It has many excellent characteristics:
1. The relative density is small, and it is one of the lightest varieties in plastics.
2. Good mechanical properties, in addition to impact resistance, good molding processing performance.
3. With high heat resistance, the continuous use temperature can reach 110-120℃.
4. Good chemical performance, almost no water absorption, and no reaction with most chemicals.
5. The texture is pure and non-toxic.
6. Good electrical insulation.
7. Good transparency.
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