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What Is PU Coating And PA Coating?
Oct 27, 2017

What Is PU Coating And PA Coating?


Polyacrylate 


Polyacrylate referred to as PA or AC

Polyacrylate coating is one of the commonly used coating. It has the following advantages:

1. Resistant to sunlight and climate fastness is not easy to yellowing.

2. Good transparency and good compatibility is conducive to the production of colored products coating. 

3.Good washability.

4. Strong adhesion

5. Low cost.

The disadvantages is that

1. Poor elasticity ,easy wrinkle.

2. Poor surface finish.

3. It's difficult to adjust the feel of touch.

The initial polyacrylate coating is a purely waterproof product. After decades of development, the current varieties are not only with waterproof and breathable,flame retardant and other functions  And there are low-temperature energy-saving features. Polyacrylate coatings are generally made of hard components such as polyacrylic acid ester of exergy and exergy in the soft component such as butyl acrylate in copolymerization and etc. 

The main monomers of the polyacrylate coating are acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, etc. In order to improve its waterproof performance,If necessary, can be added to acrylamide and acrylonitrile polymerization initiator generally used peroxide, such as potassium persulfate and so on.

We have products of PA coating in windbreakers.

PU.jpg

Polyurethane coating


Polyurethane referred to as PU. It is a polymer compound containing -NHCOO-units in its molecular structure.

The unit is reacted with an isocyanate group and a hydroxyl group. The reaction formula is as follows

N=C=O + HOˉ NH-COOˉ


In the 1970s, Germany's Otto Bayer first synthesized the PU. Prior to 1950, PU became a textile finishing agent in Europe, but mostly solvent-based products for dry coating finishing. In the 1960s, due to the enhancement of people's environmental awareness and the introduction of government environmental regulations, the PU coating came into being. After the 1970s, the PU coating of the water system developed rapidly .PU coated fabric has been widely used. Since the 1980s, there has been a breakthrough in the research and application of technology. Compared with other countrie, China textile finishing agent of the late study.

Polyurethane coating agent is the main type of development today. Its advantages lie in

1. The coating is soft and elastic.

2. Strong coating strength ,can be used for thin coating.

3. Porous coating with moisture permeability and ventilation performance.

4. wear resistant,resistant to dry,resistance dry cleaning.

Its disadvabtage is that

1.High cost.

2.Poor resistance to climate.

3. Water, heat, alkali to be hydrolyzed.

PU coating agent according to the classification contains Polyester polyurethane, polyether polyurethane, aromatic isocyanate polyurethane, aliphatic isocyanate polyurethane exergy. According to the department of energy use by the media as the solvent and water.

Here are some of the PU coating products for your reference..Waterproof Jackets









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