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    Testing standard for polysiloxane coatings

    发布时间:2019-04-15 浏览:116473次 字号:  

    Testing standard for polysiloxane coatings


    HG/T 4755-2014


    ◆ application scope


    Polysiloxane coating products are mainly used for the decoration and protection of bridges, airports, locomotives and other transportation facilities, sports venues, television towers and other public facilities, petrochemical equipment such as storage tanks and pipelines, offshore buildings such as oil platforms, electric towers and port machinery facilities, and other steel structure surfaces. It can also be used for concrete structures, non-ferrous metals and other surfaces.


    ◆ standard number


    HG/T 4755-2014


    ◆ requirements


    project


    index


    Status in container


    After mixing, there is no hard block


    Fineness a/ μ m ≤


    agree


    Nonvolatile content /% ≥


    seventy-five


    Dry / h ≤


    Surface stem


    two


    Practical work


    twenty-four


    Film appearance


    normal


    Silicon oxygen bond content in base material (full paint) /% ≥


    fifteen


    Volatile organic compound (VOC) content / (g / L) ≤


    three hundred and ninety


    Heavy metal content / (mg / kg) ≤


    Lead (PB)


    one thousand


    Cadmium (CB)


    one hundred


    Hexavalent chromium (Cr6 +)


    one thousand


    Mercury (Hg)


    one thousand


    Applicable period / h (except single component)


    agree


    Gloss A60 °


    agree


    Pencil hardness (scratch) ≥


    F


    Bending test / mm ≤


    three


    Impact resistance / cm


    fifty


    Wear resistance (500g. 500r) / g ≤


    zero point zero four


    Adhesion (pull method) / MPa ≥


    five


    Acid resistance (50g / L H2SO4)


    No abnormality after 240h


    Alkali resistance (50g / L NaOH)


    No abnormality after 240h


    Wet cold and heat cycle resistance (10 times)


    No abnormality


    Damp heat resistance (3000h)


    No blistering, rust and falling off


    Salt spray resistance (3000h)


    No blistering, rust and falling off


    Resistance to artificial climate aging (3000h)


    White and light B


    Discoloration ≤ grade 2, light loss ≤ grade 2, pulverization ≤ grade 2, no blistering, falling off and cracking


    Other colors


    Discoloration ≤ grade 3, light loss ≤ grade 3, pulverization ≤ grade 2, no blistering, falling off and cracking


    Cyclic aging test (25 times)


    Pulverization ≤ grade 2 or agreed, no blistering, rust, falling off and cracking


    ◆ inspection method


    ◇ fineness: according to GB / T 1724-1979.


    ◇ nonvolatile content: according to the provisions of GB / T 1725-2007.


    ◇ drying time: according to the provisions of GB / T 1728-1979.


    ◇ volatile organic compound (VOC) content: according to the provisions of GB / T 1725-2007.


    ◇ silicon oxygen bond content in the base material (full paint): the sample is centrifuged, the clear liquid part is taken, the solvent is volatilized and crushed into powder. Accurately weigh a certain amount of powder, remove the organic matter in the base material by gradient ashing, and the ash is silicon dioxide. The content of silicon oxygen bond in the base material is calculated from the mass of ash powder.


    ◇ heavy metal content: according to Appendix D of gb24408-2009.


    ◇ gloss 60 °: according to the provisions of GB / t9754-2007.


    ◇ pencil hardness (scratch): according to GB / T 6739-2006.


    ◇ bending test: according to GB / T 6742-2007.


    ◇ impact resistance: according to GB / T 1732-1993.


    ◇ wear resistance: according to GB / T 1768-2006.


    ◇ adhesion (pulling method): according to the provisions of GB / T 5210-2006.


    ◇ acid resistance: according to the soaking method in GB / T 9274-1998.


    ◇ alkali resistance: according to the soaking method in GB / T 9274-1998.


    ◇ damp heat resistance: according to the provisions of GB / T 1740-2007.


    ◇ salt spray resistance: according to GB / T 1771-2007.


    ◇ artificial aging resistance: according to Appendix A of GB / T 1865-2009.


    ◇ cyclic aging resistance test: according to the test conditions in Appendix A of iso20340:2009 (the test plate is not scribed). The results shall be evaluated according to GB / T 1766.


    ◇ packaging: according to the provisions of class I packaging requirements in GB / T 13491.


    ◇ storage: the product shall be stored in a ventilated and dry manner to prevent direct sunlight, and shall be isolated from the fire source and away from the heat source. The storage period of the product shall be determined according to the type and indicated on the packaging mark.