PVDF Heat shrinkable tube is also called polyvinylidene fluoride heat shrinkable tube, is a kind of fluorine plastic, then first we to what is fluorine plastic, it has what classification.

1. What is PVDF heat shrinkable tube Coating

Definition of PVDF heat shrinkable Tube Coatings: The coating of fluorine resin as the main film-forming material is called PVDF heat shrinkable Tube coating "PVDF heat shrinkable tube coating is a form of application of fluorine resin" in Europe and the US and other countries to fluorine olefin polymers or fluorine olefin and other monomer copolymers as film-forming materials of the coating called/fluorinated coatings, in China is often referred /fluorinated Coatings

Application mechanism of 2.PVDF heat shrinkable pipe Coatings

The high key of the carbon fluoride bond is the basis of the fluorine resin used as a high weatherability coating, c one F key energy (451485KJ/m "L) >51 One" Key Energy (422 heart/m "L) >c one Si key energy (318KJ/mol)" The ultraviolet light wavelength in the sun is 400nln, The photon energy of the 220nln wavelength is 544 heart/mol, and only photons less than 22Onln can make the C one F key of the fluorine polymer destroy "the proportion of photons less than 220nln in sunlight is very small, and sunlight has almost no effect on fluorine polymers" shows the high weatherability of fluorinated polymers " As a result, the fluorine polymer coating (2), which has developed more than 40 years of high thermal shrinkage weatherability, is also highly chemically stable, with fluorine atoms having the highest electro-negative and smaller atomic radius, a large fluorine carbon bond, a large repulsive force in the carbon chain, a spiral structure of the carbon chain, and surrounded by fluorine atoms) shielding effect, This determines the very high chemical stability of fluorinated polymers. "

Features of 3.PVDF heat shrinkable tube Coatings

PVDF Heat shrinkable Tube coatings mostly have the following characteristics: Non-stick performance or anti-viscosity performance, easy to clean; o surface tension is small, showing excellent self-lubricating performance and low friction performance, hydrophobic and hydrophobic properties, non-polluting materials in the equipment, coating hygiene, after high temperature curing film, the coating itself is pollution-free and does not contain heavy metal ions; High chemical stability, showing outstanding weatherability, dielectric properties and heat resistance "

4. Classification of fluorine resins

The classification of fluorine resins is mainly based on the types of monomers used in synthetic resins. "The monomer used in synthetic resin mainly includes fluorine ethylene (V work! Partial fluoride side DF)! trichloroethylene (CTFE)! perfluorinated ethylene (P), etc." A variety of fluorine resins are synthesized by polymerization of different monomers or copolymerization with other olefin monomers "often used in the field of coatings including polyvinyl chloride resins! Polyvinylidene fluoride double wall heat shrinkable tube resin! trichloroethylene copolymer resin! PTFE Resin" 1.4.1 polyvinyl chloride resin polyvinyl chloride (PvF) It is a thermoplastic resin, polymerized by fluorine ethylene (VF) monomer, developed late "in the 40, DuPont began to study the beginning of semi-industrial production in the PVF,60, the 70 's mass production, mainly used in the preparation of membranes and coatings" polyvinyl chloride resins have many properties of general fluorine resins, in chemical stability ! Thermal stability and use temperature is not as good as PTFE resin, but there is a high tensile strength! Resistant to breathability! Wear resistance and so on, so its application in metal inner wall coating is more "

Fully attached, PVDF belongs to one of the fluorine plastics, with the general characteristics of fluorine plastic resin.

Thermal shrinkage casing is a thermoplastic plastic tubular material, also known as heat shrinkable tube, some people are also called thermoplastic tubes.

It is widely used in electronics, electric power, electrical, mechanical and other industries. Mainly insulation, protection, but also a variety of other uses, such as decoration. Therefore, for different uses of heat shrinkable casing, there are different materials of hot shrinkage casing.

The so-called material is actually a comprehensive material formulation, including a variety of materials, mainly ingredients, flame retardants, plasticizers, antioxidants and so on. Of course, the main material is a high temperature heat shrinkable tube fixed heat shrinkable tube of major performance of the substance, excipients can increase or increase some performance, so when we talk about hot casing material, in fact, refers to the ingredients.

According to the current product line to see the main ingredients can be divided into PE polyethylene heat shrinkable casing, PVC PVC heat shrinkable casing, PET heat shrinkable casing, Teflon heat shrinkage casing, EVA heat shrinkage casing, rubber heat shrinkable casing and other new materials hot shrinkage casing and so on (PE, PVC and so on are chemical abbreviation abbreviation, It is not clear that friends can check the chemical dictionary), and some people will say what polyolefin heat shrinkable casing, polyester heat shrinkable casing, in fact, these two are a generic term, olefin and esters are a large category of chemicals.

For example, our polyethylene, polyvinyl chloride belongs to Polyolefin class, PET belongs to polyester category. Of course, even the same polyethylene heat shrinkable casing, there are differences, because polyethylene is divided into many types, such as high-density polyethylene (HDPE) molecular chain only a small amount of short chain branch; low density polyethylene (LDPE) molecular chain is a large number of long-chain branch; linear low density polyethylene (LLDPE), does not contain long chain branch, But contains short side chain branch, "Linetype" means no long chain of branch. There are also differences in the performance of each polyethylene.

PVDF热缩管材料分析

PVDF热缩管又叫聚偏氟乙烯热缩管，属于氟塑料的一种，那么首先我们要是到什么是氟塑料，它有哪些分类。

1.什么是PVDF热缩管涂料

PVDF热缩管涂料的定义：氟树脂为主要成膜物质的涂料称为PVDF热缩管涂料”PVDF热缩管涂料是氟树脂的一种应用形式”在欧美等国家把以氟烯烃聚合物或氟烯烃和其它单体的共聚物等为成膜物质的涂料称为/氟碳涂料,在我国则常称为/含氟涂料

2.PVDF热缩管涂料应用机理

碳一氟键的高键能是氟树脂用作高耐候性涂料的基础,c一F键能(451485KJ/m”l)>51一”键能(422心/m”l)>c一si键能(318KJ/mol)”阳光中的紫外光波长为220一400nln,220nln波长的光子能量为544心/mol,只有小于22Onln的光子才能使氟聚合物的C一F键破坏”在阳光中小于220nln的光子比例很小,阳光几乎对氟聚合物没有任何影响)显示了氟聚合物的高耐候性”因此发展了40多年高热缩管耐候性能的氟聚合物涂料〔2〕”氟聚合物还具有极高的化学稳定性,氟原子具有最高的电负性和较小的原子半径,氟碳键能大,碳链上的氟原子排斥力大,碳链成螺旋状结构,且被氟原子包围)屏蔽效应,从而决定了氟聚合物极高的化学稳定性”

3.PVDF热缩管涂料的特点

PVDF热缩管涂料大多具有以下特点:不粘性能或防粘性能,清洗容易;o表面张力小,显示了优异的自润滑性能与低摩擦性能;憎油憎水性能,不污染设备内的物料;涂层卫生,经过高温固化成膜,涂层本身无污染而且不含重金属离子;化学稳定性高,显示了突出的耐候性能,介电性能和耐热性能”

4.氟树脂的分类

氟树脂的分类主要依据合成树脂所用单体的种类划分”合成树脂所用单体主要包括氟乙烯(V功!偏二氟乙烯侧DF)!三氟氯乙烯(CTFE)!全氟乙烯(TFE)!六氟丙烯(资P)等”通过不同单体的均聚或与其它烯烃单体的共聚来合成各种不同的氟树脂”在涂料领域经常使用的包括聚氟乙烯树脂!聚偏二氟乙双壁热缩管烯树脂!三氟氯乙烯共聚树脂!聚四氟乙烯树脂”1.4.1聚氟乙烯树脂聚氟乙烯(PvF)是一种热塑性树脂,由氟乙烯(VF)单体聚合而成,开发较晚”上世纪40年代杜邦公司开始研究PVF,60年代开始半工业化生产,70年代开始大规模生产,主要应用于制备膜和涂料”聚氟乙烯树脂具有一般氟树脂的许多特性,在化学稳定性!热稳定性和使用温度方面不如聚四氟乙烯树脂,但是却有较高的拉伸强度!抗透气性!耐磨性等特点,因此其在金属内壁涂料中的应用较多”

综上所属，PVDF属于氟塑料其中的一种，拥有氟塑料树脂的一般特点。

热缩套管是一种热塑性塑胶管状材料，也叫热缩管，有的人还叫热塑管。

它广泛应用于电子、电力、电气、机械等行业。主要起绝缘、保护作用，也有其他各种用途，比如装饰。所以针对热缩套管不同用途，就有不同材质的热缩套管。

所谓的材质实际上是一种综合的物料配方，包括多种多样材料，主要有主料、阻燃剂、增塑剂、抗氧化剂等等。当然主料是决高温热缩管定热缩管主要性能的物质，辅料可以增加或增加某些性能，所以当我们谈到热套管材质的时候，其实就是指主料。

按目前的产品系列来看主料可以分为PE聚乙烯热缩套管、PVC聚氯乙烯热缩套管，PET热缩套管，铁氟龙热缩套管，EVA热缩套管，橡胶热缩套管以及其他新材质热缩套管等等（PE、PVC等都是化学简称缩写，不清楚朋友可以查化工词典），还有的人会说什么聚烯烃热缩套管、聚酯热缩套管，其实这两种是个统称，烯烃和酯类是化学物质一大类。

比如我们的聚乙烯，聚氯乙烯就属于聚烯烃类，PET就属于聚酯类。当然即便是同样属于聚乙烯热缩套管，也有差别，因为聚乙烯又分为很多种类，比如高密度聚乙烯(HDPE)分子链仅有少量的短链支化;低密度聚乙烯(LDPE)分子链是大量的长链支化;线型低密度聚乙烯(LLDPE),不包含长链支化,但包含短侧链支化,“线型”意思为没有长链支化。每种聚乙烯性能也有差别。