No matter what the season, when you travel outdoors, you will always encounter rain. Pour your heart from head to toe. At this time, if you have a waterproof outdoor backpack, you want to protect your personal documents, money, and communication tools. You need to replace the clothes to avoid being drenched. I believe that as a person who loves outdoor sports, it is very clear that even if you don't need a waterproof bag, you can use a small waterproof bag to put money, mobile phones, documents and so on. Speaking of this, you must doubt that the waterproof bag really has such a good waterproof function, may protect the contents of the bag from getting wet?
The waterproof bags currently on the market are made of TPU waterproof fabric. TPU is the abbreviation of Thermoplastic Urethane. The Chinese name is thermoplastic polyurethane elastomer. TPU is made up of diphenylmethane diisocyanate or toluene diisocyanate, diisocyanate molecules, macromolecular polyols and low molecular polyols. Polymer Materials. Its molecular structure is a rigid block obtained by reacting diphenylmethane diisocyanate or toluene diisocyanate with a chain extender, and diphenylmethane diisocyanate or toluene diisocyanate. The diisocyanate molecule and the macropolyol are alternately formed by the reaction of the soft segments.
TPU is a mature and environmentally friendly material with excellent high tension, high tensile strength, toughness and aging resistance. At present, TPU has been widely used in medical and health, electronic appliances, industry and sports. It has the characteristics of high strength, good toughness, wear resistance, cold resistance, oil resistance, water resistance, aging resistance and weather resistance which are unmatched by other plastic materials. . At the same time, it has many excellent functions such as high water repellency, moisture resistance, cold resistance, antibacterial, mildew proof, warmth, UV resistance and energy release.