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    水性樹脂Bayhydrol A 2646

    水性樹脂Bayhydrol A 2646

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    • Introduction
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    • Bayhydrol? A 2646

      Type????????????????? Anionic polyacrylate dispersion
      Form supplied???????? approx. 50 % in water/Dowanol? PnB/triethanolamine

      ????????????????????? (46 : 1.1 : 2.9)
      Uses????????????????? Waterborne, low VOC two-component polyurethane coatings in

      ????????????????????? combination with aliphatic polyisocyanates.


      Specification
      Property????????????? Value?????????? Unit of measurement???????? Method
      Non-volatile content
      (1 g/1 h/125 °C/convection oven)
      ?????????????????????? 48 - 51?????????? %????????????????? DIN EN ISO 3251
      Viscosity at 23 °C
      D = approx. 40 s-1
      ????????????????????? 1,000 - 3,500???? mPa·s????????????? DIN EN ISO 3219/A.3
      pH
      (1 : 4 in demineralised water)
      ????????????????????? 7 - 8???????????????????????????????? DIN ISO 976


      Other data*
      Property?????????????? Value????????? Unit of measurement???????? Method
      Hydroxyl content,
      (calculated on solid)***
      ?????????????????????? approx. 3.8?????? %?????????????????? internal method
      Hydroxyl content,
      (supply form)
      ?????????????????????? approx. 2.7?????? %?????????????????? internal method
      Density at 20°C?????? approx. 1.06???? g/ml???????????????? DIN EN ISO 2811-2

      ?????????????????????? *** w/o OH groups of the Dowanol? PnB and triethanolamine


      *These values provide general information and are not part of the product

      specification.


    • Bayhydrol? A 2646

      Solubility / thinnability??? The product is soluble in water.

      Properties / Applications??? On account of its outstanding mechanical and

      ???????????????????????????? chemical resistance, the product is particularly

      ???????????????????????????? suitable for the formulation of hard, high-gloss

      ???????????????????????????? sealers for mineral substrates and reactive resins

      ???????????????????????????? (EP, PUR). Furthermore, excellent accentuation of

      ???????????????????????????? the grain of the substrate (e.g. colored coatings)

      ???????????????????????????? is achieved.
      ???????????????????????????? The binder can also be used for the formulation of

      ???????????????????????????? high-grade low VOC coatings for use on substrates

      ???????????????????????????? such as wood, metal, plastic, etc.
      ???????????????????????????? The product can also be combined with other water-

      ???????????????????????????? reducible binders. On account of the many potential

      ???????????????????????????? co-reactants, compatibility testing should always

      ???????????????????????????? be carried out.
      ???????????????????????????? The high reactivity enables short drying times,

      ???????????????????????????? which contribute to enhanced productivity.
      ???????????????????????????? The viscosity of the product is largely governed by

      ???????????????????????????? the pH. As the pH may decrease during storage, a

      ???????????????????????????? decrease in viscosity is also to be expected. The
      ???????????????????????????? viscosity can be restored to its original value by

      ???????????????????????????? the addition of small amounts of triethanol amine.
      ???????????????????????????? Dowanol? PnB and triethanolamine are OH-functional

      ???????????????????????????? cosolvents/amines that react with isocyanates. They

      ???????????????????????????? are therefore reactive thinners and not

      ???????????????????????????? VOC-relevant pursuant to the Decopaint Directive

      ????????????????????????????? 2004-42-EC.


      Storage????????????????????? - Storage in original sealed Bayer MaterialScience

      ????????????????????????????? containers.
      ???????????????????????????? - Recommended storage temperature: > 0 - 30 °C.
      ???????????????????????????? - Protect from frost, heat and foreign material.

      ?????????????????????????????? General information: The product is sensitive to

      ?????????????????????????????? frost. Prolonged freezing can damage the product

      ?????????????????????????? irreversibly. Prolonged storage at higher temperatures
      ?????????????????????????? may result in a decrease of viscosity and/or an

      ?????????????????????????? increase of average particle size, possibly resulting

      ?????????????????????????? in sedimentation or coagulation.
      ?????????????????????????? The viscosity of the product is largely governed by

      ?????????????????????????? the pH. As the pH may decrease during storage, a

      ?????????????????????????? decrease in viscosity is also to be expected. The
      ?????????????????????????? viscosity can be adjusted to its original value by

      ?????????????????????????? the addition of small amounts of an aqueous 10 %

      ?????????????????????????? solution of Triethanolamine.
      ?????????????????????????? Contamination with certain bacteria, fungi or algae

      ?????????????????????????? may render the product unusable.


      Storage time????????????? Bayer MaterialScience represents that, for a period

      ????????????????????????? of six months following the day of shipment as stated

      ????????????????????????? in the respective transport documents, the product

      ????????????????????????? will meet the specifications or values set forth in

      ????????????????????????? section "specifications or characteristic data" above,

      ????????????????????????? what ever is applicable, provided that the product

      ????????????????????????? is stored in full compliance with the storage

      ????????????????????????? conditions set forth in and referenced under section

      ????????????????????????? "storage" above and is otherwise handled appropriately.
      ???????????????????????? The lapse of the six months period does not necessarily

      ???????????????????????? mean that the product no longer meets specifications or

      ???????????????????????? the set values. However, prior to using said product,

      ???????????????????????? Bayer MaterialScience recommends to test such a product

      ???????????????????????? if it still meets the specifications or the set values.

      ???????????????????????? Bayer MaterialScience does not make any representation

      ???????????????????????? regarding the product after the lapse of the six

      ???????????????????????? months period and Bayer MaterialScience shall not be

      ???????????????????????? responsible or liable in any way for the product failing

      ???????????????????????? to meet specifications or the set values after the

      ???????????????????????? lapse of the six months period.


      Safety????????????????? Hazards identification
      ??????????????????????? Not classified as a hazardous product as per Council

      ??????????????????????? Directive 2006/121/EC or 1999/45/EC.
      ??????????????????????? The safety data sheet should be observed. This contains

      ??????????????????????? information on labeling, transport and storage as well as

      ??????????????????????? on handling, product safety and ecology.



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