Waterborne industrial paint - a new product with environmental protection and easy use

With the continuous development of society, environmental protection has gradually become the focus of attention. In recent years, policies to limit VOC (volatile organic compounds) emissions have emerged one after another, and green environmental protection in the coating industry has become the general trend.

Since 2007, Europe, which has very strict environmental requirements, has begun to set strict VOC limits. It is proposed in the EU guidelines for decorative coatings (2007 ~ 2010) that from January 1, 2007, the EU will implement a new VOC content limit standard to further greatly reduce the VOC value in coatings, and the VOC content of solvent paint should be less than 400mg / L.

So far, it is difficult for solvent based coatings to achieve the above indicators, not to mention the more stringent requirements now. Nowadays, the VOC emission of automobile coating in industrial developed countries (such as Europe) is required to be less than 45g / ㎡. At present, traditional solvent based intermediate paint and finish paint are widely used in China, and the VOC emission of coating line is about 200g / ㎡. Therefore, the application of water-based coatings is an inevitable development trend. However, the construction process of ordinary water-based coatings is different from the traditional solvent based coatings, which can not be used in the traditional coating production line. In order to reduce VOC emission in production coating and comply with the progress of the times, pan Jixin successfully developed a new type of water-based coating (applied to metal anti-theft door painting, electroplating finish paint, etc.) which can be directly replaced in the coating line of traditional solvent based paint, so as to achieve the effect of changing oil to water.

Table 1 performance comparison of water-based varnish and varnish

Inspection items

Waterborne Varnish

Solvent varnish

Original paint status

Evenly dispersed without mechanical impurities

Evenly dispersed without mechanical impurities

colour

milky white

milky white

Original paint viscosity / S

100-10000

≥45

Flash point / ℃

＞80

≥21

Construction viscosity / S

100~500/25℃

23~28

Curing temperature / ℃

110~170

≥150

Construction humidity /%

50~80

30~80

Dilution ratio /%

100~150

10~25

PH value

4-6.5

-

storage stability

Store at 0 ~ 35 ℃ for 3 months (if it exceeds the storage period, it can be used again after passing the inspection)

Store at 5 ~ 35 ℃ for 6 months

Table 2 Comparison of solvent content and VOC emission between solvent based varnish and water-based varnish

Lacquer base

acrylic resin

Acrylic acid / amino resin

Solvent content /%

≤5

30~40

VOC emission g / ㎡

5-10

30~35