Economical comparison standard of industrial protective coatings

Often paint users believe that a home paint thick (high viscosity), construction needs to add more thinners, it is believed that the paint quality is good, cost-effective. In fact, that’s not quite the case. Because of high viscosity does not indicate that the effective components of high viscosity paint can by adding additives (like thickening agent) to improve, adding more diluent, VOC emissions increased, and the national environmental protection policies reduce the emission of VOC does not match, and eventually out of the volatile diluent diluent, waste money pollution the environment.
So, how do you compare the economics of industrial protective coatings?
1, the unit price can not be used to measure the economic performance of coatings.
For the anti-corrosion coating, whether it is on the rise or the kilogram, the price is determined by its economy cannot, because the effective content of different coatings obtained in different dry film thickness of the same case, the consumption amount of paint (volume or weight) of different. Cheaper paint may cost more.
2, the unit price per square meter can reflect the economy of the coating to a certain extent.
Although due to the existence of the loss coefficient of the problem, the cost of such coating in dry film thickness per square metre theory cost and actual cost of construction, but for the same conditions, different manufacturers of coatings, the actual loss coefficient should be the same, there is no paint loss coefficient which is large, and the paint loss coefficient another problem of small manufacturers. Therefore, according to the theoretical coating per square meter, the cost can be used to measure the economy of the anticorrosive coating. Of course, the calculation of the theoretical cost must be based on the accurate parameters of the coating (mainly the volume, the solid content and the specific gravity).
3, how to ensure the accuracy of the theoretical coating cost per square meter?
Each paint manufacturers according to their product volume solids and proportion to calculate the cost theory, but if the volume of solids and the proportion of false or inaccurate, the cost per square meter theory obtained is certainly not true. At present, many small paint factory even don’t know what is the volume of solids, also do not know how to calculate the cost theory, and some paint users is needless to say, this is difficult to achieve economic fair comparison of different manufacturers of paint.
4, volume solid parts
The bulk solid content of an anti-corrosion coating reflects how much dry film thickness can eventually be reached after the construction of a wet film thickness of a certain thickness. Bulk solids can be measured, and measurements are available:
ISO3233-1999 paints and varnishes – Determination of nonvolatile matter per unit volume by the determination of dry film density
GB9272-1988 determination of nonvolatile content in liquid coatings (equivalent to ISO3233-1984)
Standard Test Method for volume of nonvolatile matter in ASTMD2697 transparent or pigmented coatings
Test standard for specific gravity of paint:
GB\/T6750-2007 – Paints and varnishes – Determination of density – jar method
ISO2811-1974 paints and varnishes – Determination of density
The volume solid of each coating manufacturer used for parity shall be the data tested according to the above standard.
5, paint users how to compare the economy of paint manufacturers?
Some users are aware of the coating theory claims by paint manufacturers is not easy to accurately reflect the actual situation, so he came up with some way to compare, for example, by coating manufacturers to provide on-site lacquer spraying test, record the consumption of paint, the average dry film thickness and coating area, then calculate the comparison. This method has complex operation and relatively large error, which is time-consuming and time-consuming.
In fact, customers have a better way to compare: that is to test the volume of paint, solid parts and specific gravity, according to the above standards commissioned by the authority. Then you can calculate the theoretical cost per square meter.

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