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    管道環(huán)氧涂層固化度與玻璃化轉(zhuǎn)變溫度關(guān)系的研究

    Study on Relation between Curing Degree of Epoxy Coating and Glass-transition Temperature of Pipeline

    • 摘要: 針對(duì)國(guó)內(nèi)油氣輸送用熱煨彎管雙層熔結(jié)環(huán)氧粉末外防腐標(biāo)準(zhǔn)中取消環(huán)氧粉末固化度，改用兩次試驗(yàn)條件下加熱測(cè)得的涂層玻璃化轉(zhuǎn)變溫差值ΔTg來(lái)評(píng)價(jià)涂層的固化情況，指出ΔTg不能直觀(guān)地計(jì)算得出，有必要研究固化百分率與玻璃化轉(zhuǎn)變溫度的關(guān)系。利用DSC掃描儀測(cè)定環(huán)氧粉末的玻璃化轉(zhuǎn)變溫度Tg3和Tg4及其差值ΔTg，用涂層固化后剩余焓變計(jì)算固化百分率C，然后擬合固化百分率與ΔTg的對(duì)應(yīng)關(guān)系。分析結(jié)果可直觀(guān)反映出玻璃化轉(zhuǎn)變溫度ΔTg與固化度的關(guān)系，對(duì)產(chǎn)品制造過(guò)程中的質(zhì)量把控具有指導(dǎo)和推動(dòng)作用。

       

      Abstract: In the updated applicable national specifications in association with using dual-layer fusion epoxy powder method for outer surface corrosion-prevention of the hot-bend pipe for oil/gas transmission, the concept of epoxy powder curing degree has been removed, instead, the glass-transition temperature ΔTg as measured twice from the heated coating under two testing conditions is used to evaluate the curing condition of the coating.It is pointed out that the ΔTg value can not be directly calculated, and thus it is necessary to study the relation between the cure percentage and the glasstransition temperature is studied.And the glass-transition temperatures of the epoxy powder Tg3 and Tg4 and their difference ΔTg are measured by the DSCscanner.And then thecurepercentage C iscalculated with the enthalpy changeremained after thecoatingiscured, and thecorrespondence between the cure percentage C and ΔTg is fit.And this relation can be directly reflected via the analysis, which can play a quality guiding and promoting role in the manufacturing process of the product.

       

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