پوششخارجی

外墙涂料的类型
沥青涂料
沥青是一种传统的防-corrosioncoating layer, دارای سابقه ای طولانی, که متشکل از نفت آسفالت لایه و تقویت پارچه شیشه ای و پی وی سی محافظ بیرونی غشاء و فرآیندهای غشایی, با عملکرد عالی ضد آب, همراه با ارزان, مقاومت در برابر آب و چسبندگی بهتر به انواع اشیاء, ساخت و ساز ساده, تکنولوژی,, آن است که هنوز هم به طور گسترده برای فلز خوردگی. اشکال آن این است که درجه حرارت پوشش آسفالت مطابق صبر, نرم متوسط, آسان به ذوب شدن در دمای پایین و شکننده, مستعد ابتلا به کرک بر اثر, آسان به پیری, سنگ مدفون در خاک,管道，以增加机械保护层，或在沟装满沙子,increases the cost.Susceptible to bacterial attack,恶劣的工作环境,loss,especially the problem of environmental pollution during production and buried,so that in use in densely populated urban areas is limited.

煤焦油环氧涂料
Coal tar epoxy based epoxy resin and coal tar pitch as the base material,heating miscible,加入一些溶剂,anti-rust paint,filler and hardener mix abrasive material.具有优良的耐水性, مقاومت شیمیایی,corrosion resistance and good adhesion,mechanical strength and insulation advantages can bring warm and cold coating,因此代表石油沥青,coal tar pitch facilitate production.Disadvantage of coal tar epoxy coatings require longer curing time is after coating,in order to achieve the minimum strength requirements for transportation,even in summer,but also1به2روز。During curing,sand,雨,frost and snow have had an adverse effect on the coating surface at low temperatures when unable construction.Also used in the primer,paint,固化剂,diluents should be classified storage,太阳纵火成本高.

Epoxy powder coating
Epoxy powder coating by electrostatic spraying method,powder is sprayed onto the pre-treated and preheated pipe surface,the pipe surface curing reaction,form a dense coating epoxy powder coating The main disadvantage is that the film is thin,vulnerable to injury,容易出现水泡,生产技术要求高,but also more complex equipment,field construction management difficult.Different manufacturers,or even different batches of product performance differences,the choice should focus on its mechanical properties and adhesion, و غیره.In addition to the heat resistance outside,无论是作为防腐材料或防腐剂体系不如聚乙烯.Study abroad focused on its impact resistance at low temperatures,弯曲性和电绝缘;high temperature water resistance,的粘附性和抗阴极剥离性;and to protect its high cost of materials,施工困难.

Polyethylene anti-corrosion coating
Polyethylene has good impact resistance,high hardness physical and mechanical properties.Before polyethylene extrusion coating layer,管应该涂有一层密封层.Primer performance indicators are based on currently used asphalt hot melt dependent.GB in the softening point of the primer,热损失,渗透,热分解温度,there are provisions of self-repair,shear strength,peel strength.但证实了橡胶生产实践,仍然有许多不足之处,如低温级别,poor bonding properties.

Polyethylene tape coating
Since the beginning of the tape and packed with polyethylene inner band played the role of anti-corrosion insulation,packed within the protective tape effects that make it from damage.When using polyethylene tape as a coating,the hierarchical structure of its coating according to specification requirements are divided into general level,to strengthen the level and especially to strengthen the level(newly revised specification has canceled the special strengthen level).This design is more convenient,according to the different environment with different corrosion level,和罐和石油沥青涂敷,煤焦油环氧涂料对应(approximate correspondence),to facilitate comparison choice.根据防腐要求,different construction methods to select different thickness,在带和打包内的不同宽度(尤其是对管道的腐蚀).

聚乙烯涂层的层结构
Polyethylene three-layer structure of the protective layer,also known as PE,在三层结构,环氧底漆的主要作用是:以形成连续涂层,直接键合到管表面并具有良好的耐化学性和抗剥离阴极性能;和的粘合剂中间层，以形成化学活性基团键合,确保整个涂层具有在较高温度下密合性优异.The intermediate layer is typically a copolymer adhesive,whose main component is a polyolefin,is now widely used vinyl copolymer adhesive.Polar functional group of the copolymer with an epoxy adhesive primer epoxy groups can react hydrogen or a chemical bond,the intermediate layer and the bottom layer to form a good bond;非极性的乙烯部分和聚乙烯的具有与亲合作良好的表面层,so the middle layer and the surface layer also has good adhesion properties.The main role of the polyethylene surface layer is from mechanical protection and anti-corrosion effect,与传统的二层结构聚乙烯涂层具有相同的效果.