一、彩色涂層鋼板結構是怎樣的
彩色涂(tu)(tu)層(ceng)鋼板是(shi)用鍍鋅鋼板或冷軋鋼板為基體,經表面處理后涂(tu)(tu)以各種保護、裝飾涂(tu)(tu)層(ceng)的一種復(fu)合金屬板材,它的結構分為五層(ceng),由內至(zhi)外(wai)分別是(shi):
冷(leng)軋板(ban)、鍍鋅層(ceng)(ceng)(ceng)(ceng)(ceng)、化學(xue)轉(zhuan)化層(ceng)(ceng)(ceng)(ceng)(ceng)、初涂(tu)(tu)(tu)(tu)層(ceng)(ceng)(ceng)(ceng)(ceng)(底漆(qi))、精(jing)涂(tu)(tu)(tu)(tu)層(ceng)(ceng)(ceng)(ceng)(ceng)(正、背面(mian)漆(qi)),其中涂(tu)(tu)(tu)(tu)層(ceng)(ceng)(ceng)(ceng)(ceng)的質量直接影(ying)響到彩鋼(gang)(gang)板(ban)的品(pin)質。彩色涂(tu)(tu)(tu)(tu)層(ceng)(ceng)(ceng)(ceng)(ceng)鋼(gang)(gang)板(ban)又稱預涂(tu)(tu)(tu)(tu)層(ceng)(ceng)(ceng)(ceng)(ceng)鋼(gang)(gang)板(ban),其涂(tu)(tu)(tu)(tu)層(ceng)(ceng)(ceng)(ceng)(ceng)有(you)多種類型,大致(zhi)可分為無機涂(tu)(tu)(tu)(tu)層(ceng)(ceng)(ceng)(ceng)(ceng)、有(you)機涂(tu)(tu)(tu)(tu)層(ceng)(ceng)(ceng)(ceng)(ceng)和復合涂(tu)(tu)(tu)(tu)層(ceng)(ceng)(ceng)(ceng)(ceng)三大類。
二、預涂層鋼板表面涂層是什么
彩鋼板(ban)(ban)是將冷軋彩鋼板(ban)(ban)、鍍(du)鋅鋼板(ban)(ban),進(jin)行表面化(hua)(hua)學處理后涂敷(輥涂)或復合有機薄膜(PVC膜等),再經烘烤固化(hua)(hua)而制(zhi)成的產品,因此也(ye)稱預涂層(ceng)鋼板(ban)(ban),它的表面涂層(ceng)主要有四種:
1、PE
Polyester,即聚酯油漆,將PE聚酯涂料涂裝在金屬板(ban)上,再(zai)經高溫烘烤做成。PE涂料對(dui)于(yu)材質有良好的附著(zhu)性,用這種涂層的彩鋼板(ban)易于(yu)加工(gong)(gong)成型(xing),價廉且產品多(duo)(duo),顏色和光澤的選擇余地大,一般用在空氣污染不嚴重的地區或需多(duo)(duo)次成型(xing)加工(gong)(gong)的產品。
2、SMP
Silicone Mobified Polyester,硅改(gai)性(xing)聚酯油漆(qi),是使用SMP硅改(gai)性(xing)樹脂酯涂(tu)料涂(tu)裝在金屬板上,再經高溫烘(hong)烤做成的,這(zhe)種涂(tu)層(ceng)的彩(cai)鋼板,涂(tu)膜的硬度、耐(nai)磨性(xing)和(he)耐(nai)熱(re)性(xing)良好(hao)(hao),且具有良好(hao)(hao)的外(wai)(wai)部耐(nai)久性(xing)和(he)不粉化(hua)性(xing),但光澤保持(chi)性(xing)和(he)柔韌性(xing)有限,主要用于建(jian)物(wu)屋頂(ding)及外(wai)(wai)墻(qiang)。
3、HDP
Highdurable Polyster,高(gao)耐候油漆(qi),優(you)于普通的硅(gui)改(gai)性聚(ju)酯涂料,適用于等對抗紫外線要求較高(gao)的輕(qing)鋼(gang)結構建筑、平改(gai)坡屋頂等。
4、VDF
Polyvinylidene Fluoride,氟碳油漆,這種涂層的彩鋼板具有非常好的(de)防(fang)蝕性和色澤保持性,機械性能、耐(nai)(nai)紫外線和耐(nai)(nai)熱性能也很特出(chu),適用于等(deng)對抗紫外線、耐(nai)(nai)候(hou)性要求高(gao)的(de)化(hua)工廠(chang)、電(dian)廠(chang)、鋼廠(chang)、高(gao)鐵站等(deng)。