PVDF heat-shrinkable tube is also called polyvinylidene fluoride heat-shrinkable tube. It belongs to one kind of fluoroplastics. So first we need to know what is fluoroplastics and what kind of classification it has.
1. What is PVDF Heat-shrinkable Pipe Coatings
Definition of PVDF Thermal Shrinkage Pipe Coatings: Coatings with fluorine resin as the main film-forming material are called PVDF Thermal Shrinkage Pipe Coatings. PVDF Thermal Shrinkage Pipe Coatings are an application form of fluorine resin. Coatings with fluorine olefin polymers or copolymers of fluorine olefins and other monomers as film-forming materials are called/fluorocarbon coatings in European and American countries, while in our country they are often
2. Application mechanism of PVDF heat shrinkable pipe coating
The high bond energy of C-F bond is the basis for fluororesin to be used as high weatherproof coatings. C-F bond energy (451485KJ/m"l) > 511"bond energy (422 centers/m"l) > c-Si bond energy (318KJ/mol)" The ultraviolet light wavelength in sunlight is 220-400 nln, and the photon energy of 220 NLN wavelength is 544 centers/mol. Only photons less than 22Onln can destroy C-F bond of fluoropolymer in the proportion of photons less than 220nln in sunlight. Small, sunshine almost has no effect on fluoropolymer) shows the high weatherability of fluoropolymer. "Therefore, fluoropolymer coatings with high heat shrinkable tube weatherability have been developed for more than 40 years. Fluoropolymer also has high chemical stability. Fluorine atoms have the highest electronegativity and smaller atomic radius, fluorocarbon bond energy is high, fluorine atoms on carbon chain repel force is high, carbon chain spiral structure, and so on." Surrounded by fluorine atoms) the shielding effect determines the extremely high chemical stability of fluoropolymers.
3. Characteristics of PVDF Heat-shrinkable Pipe Coatings
Most of the PVDF heat shrinkable pipe coatings have the following characteristics: non-stickiness or anti-stickiness, easy cleaning; low surface tension, showing excellent self-lubrication and low friction performance; hydrophobicity and hydrophobicity, non-polluting materials in equipment; sanitary coating, after curing at high temperature, the coating itself is pollution-free and does not contain heavy metal ions; high chemical stability, showing outstanding weather resistance, dielectric properties. Energy and heat resistance"
4. Classification of fluororesins
The classification of fluorine resins is mainly based on the types of monomers used in synthetic resins. "The monomers used in synthetic resins mainly include vinyl fluoride (V work! DF side of vinylidene fluoride)! Trifluorochloroethylene (CTFE)! Perfluoroethylene (TFE)! Hexafluoropropylene (Zip)" synthesizes various fluorine resins through homopolymer of different monomers or copolymerization with other olefin monomers"which are often used in the field of coatings, including polyfluorine. Ethylene Resin! Polyvinylidene Difluoride Double-walled Thermal Shrinkage Tube Olefin Resin! Trifluorochloroethylene Copolymer Resin! Polytetrafluoroethylene Resin "1.4.1 Polyfluoroethylene Resin Polyfluoroethylene (PvF) is a thermoplastic resin, which is synthesized from VF monomer, and developed later." DuPont Company began to study PVF in the 1940s, began semi-industrial production in the 1960s, and began mass production in the 1970s, mainly used in preparation. Membrane and Coatings "Polyfluoroethylene Resin has many characteristics of general fluorine resin, in chemical stability, thermal stability and use temperature is not as good as polytetrafluoroethylene resin, but it has higher tensile strength, air permeability, wear resistance and other characteristics, so its application in metal inner wall coating is more."
To sum up, PVDF belongs to one of the fluoroplastics, which has the general characteristics of fluoroplastics resin.
Heat shrinkable sleeve is a kind of thermoplastic tubular material, also known as heat shrinkable tube, or thermoplastic tube.
It is widely used in electronics, power, electrical, mechanical and other industries. Mainly for insulation and protection, but also for other purposes, such as decoration. Therefore, for different purposes of thermal shrinkable casing, there are different materials of thermal shrinkable casing.
The so-called material is actually a comprehensive material formula, including a variety of materials, mainly the main ingredients, flame retardants, plasticizers, antioxidants and so on. Of course, the main material is the material that determines the main performance of the heat-shrinkable tube. The auxiliary material can increase or increase some performance. So when we talk about the material of the heat-shrinkable tube, it actually refers to the main material.
According to the current product series, the main materials can be divided into PE polyethylene thermo-shrinkable sleeve, PVC polyvinyl chloride thermo-shrinkable sleeve, PET thermo-shrinkable sleeve, Teflon thermo-shrinkable sleeve, EVA thermo-shrinkable sleeve, rubber thermo-shrinkable sleeve and other new materials thermo-shrinkable sleeve and so on (PE, PVC and so on are abbreviated for chemical abbreviations, it is not clear what polyolefin thermo sleeve friends can refer to chemical dictionary), and Polyester heat-shrinkable casing, in fact, these two are collectively called, olefins and esters are a large class of chemical substances.
For example, our polyethylene, polyvinyl chloride belongs to polyolefins, PET belongs to polyesters. Of course, even if it belongs to polyethylene heat shrinkable sleeve, there are differences, because polyethylene can be divided into many kinds, such as high density polyethylene (HDPE) molecular chain only a small amount of short chain branching; low density polyethylene (LDPE) molecular chain is a large number of long chain branching; linear low density polyethylene (LLDPE), does not contain long chain branching, but contains short side chain branching, "linear" means no long chain branching. 。 The properties of each polyethylene are also different.