PET screen hydrolysis

How to improve the hydrolysis resistance and service life of dryer fabrics in paper machine clothing?

PET monofilaments have a series of advantages such as good impact resistance, wear-resistance and fatigue resistance, but PET is prone to hydrolysis aging and failure under humid and especially hot and humid conditions.

The paper machine dryer screen usually works under an environment of 100℃ containing water and gas. Because PET material is not resistant to moisture and heat aging, the dryer screen cracks due to hydrolysis aging after a period of time, which has a great impact on the normal production process.

PET screen hydrolysis
PET paper screen

The essence of hydrolysis of PET material is that its ester bond reacts with water molecules under the catalytic effect of terminal carboxyl groups to generate alcohols and carboxylic acids, and the newly generated carboxylic acids will further catalyze the hydrolysis reaction, which eventually leads to accelerated degradation of polyester material performance and eventual failure.

At present, an effective and low-cost way to solve the problem of PET hydrolysis is to add carbodiimide anti-hydrolysis agent. Because the anti-hydrolysis agent can react with the end carboxyl group in the polyester material to produce urea compounds, effectively slowing down the process of hydrolysis reaction.

For example, when 0.5%-1.0% of carbodiimide anti-hydrolysis agent HyMax®1010 is added to the monofilament of paper machine dryer screen, its anti-hydrolysis performance is significantly enhanced and its service life is at least 3 times longer. This not only reduces the cost for screen replacement but also reduces the number of stops and screen replacements, significantly reducing paper production costs.

Langyi New Material is a professional supplier of carbodiimide anti-hydrolysis agent, the product is not only applied to paper machine drying screens but also suitable for polyester film, polyester engineering parts, polyester sheet, etc., effectively extending the use performance and service life of polyester products. For more product applications, please contact us [email protected]

More related information on paper machine dryer screen

  1. Application of anti-hydrolysis agent in PET polyester monofilament for paper making clothing industry.
  2. Technical key points of paper machine dryer screen and tips on its application

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