Polyvinyl chloride, abbreviated as PVC (Polyvinyl chloride), is a thermoplastic resin obtained by polymerizing vinyl chloride under the action of an initiator. The vinyl chloride homopolymer and the vinyl chloride copolymer are collectively referred to as vinyl chloride resins.
PVC is a white powder with an amorphous structure and a small degree of branching. Industrial production of PVC molecular weight is generally in the range of 50,000 to 110,000, with greater polydispersity, molecular weight increases with the decrease of polymerization temperature; no fixed melting point, 80-85 ° C begins to soften, 130 ° C becomes viscoelastic state , 160 ~ 180 ° C began to transform into a viscous flow state; has good mechanical properties, tensile strength of about 60MPa, impact strength of 5 ~ 10kJ / m2; has excellent dielectric properties. However, the stability to light and heat is poor. When it is exposed to sunlight above 100 °C or exposed to sunlight for a long time, it will decompose to produce hydrogen chloride, and further autocatalytic decomposition, causing discoloration, and physical and mechanical properties are also rapidly declining. In practice, it is necessary to add stability. Agent to improve the stability to heat and light.
PVC is very hard and has poor solubility. It can only be dissolved in a few solvents such as cyclohexanone, dichloroethane and tetrahydrofuran. It is stable to organic and inorganic acids, alkalis and salts, and its chemical stability increases with the use temperature. And lower. PVC is dissolved in acetone-carbon disulfide or acetone-benzene mixed solvent for dry spinning or wet spinning. It is called polyvinyl chloride and has the characteristics of flame retardant, acid and alkali resistant, antibacterial, abrasion resistant and environmentally friendly. And has better warmth and flexibility.
40m Digital Laser Distance Meter
Laser Measure Tool is an advanced measuring tool apply for indoor measurement as well as for outdoor construction sites, which has different measurement modes including single measurement, continuous measurement (with Min/Max function), area/ volume measurement and Pythagoras Measurement. Laser Measurement Tool is a Class II laser product with less than 1mW power output. Measuring range covers from 0.03 to 40m. The Laser Range Finder provides an easier and faster way to meet the needs of precise measurements. Due to its compact design, it can be easily pack in a bag or jacket pocket. And a removable hand strap can ensure its safe handling.
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Chengdu ZT Electronics Technology Co., Ltd. , https://www.lasermeasuretool.com