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News > Dynamic industry > Polyether application of defoaming agent in papermaking industry

Polyether application of defoaming agent in papermaking industry

Consumers polyether defoamer overview of polyether defoaming agent of the main active component is ethylene oxide and propylene oxide block copolymer and molecular weight is generally greater than 3000. In 1954, the first production by American defoaming agent Wagndott,then obtained the rapid development. Especially in the 60's of 20th century, western countries basically completed the transformation of ethylene oxide and propylene oxide as raw material for the synthesis route, for the preparation of ethylene oxide and propylene oxide provides a lot of cheap raw materials, greatly promoted the development of polyether industry. China polyetherdefoamer production starting in 1969, the first application in fermentation industry. In the middle of 80, polyether defoaming agent in papermaking industry began to put into use, which makes the production of coated paper manufacturers benefit. Cancel such bubble agent performance characteristics: non-toxic, easy to use, dispersion property and good thermal stability and chemical stability, not only has excellent fire foam performance, but also has stable foam capacity [7].Polyether defoaming agent according to the specific circumstances of the application system can be made into oil-based or water-based products and polyether can also be and fatty acid amide and silicone compound into defoaming powerful composite defoaming agent.

Polyether defoaming agents and their application in paper industry in paper coating process in the preparation of, due to pigment, alkali foaming material existence, mechanical agitation to within the microenvironment of the system into the air, increasing the micro environment of the phase interface, formed by a combination of liquid and solid particles and gas three-phase foam, resulting in the paper surface produced white [2]. In order to eliminate the white spot and make paper uniform and smooth white paper, firm coating uniformity and printing, pattern clear and delicate, in coated paper production process must join an appropriate amount of defoaming agent. Coated paper anti foaming agent and pulping defoamers are different, the latter to join defoaming agent in the washing process is detached from the pulp, while the former is retained in paper products, has a great effect on the quality of the paper. Coated paper in technical requirements: any papermaking additives adding to the were on the coating adhesion, dispersion and printing adaptability without any side effects, and high quality varieties of additives can also improve the paper gloss, picking velocity and lubrication performance. In fact, the coated paper defoaming agent has a variety of functions oftendisappear, defoaming, polishing, bubble lubrication etc.. Coated paper defoamer variety, different coating formulations have different defoaming agent compatibility. For example, as a common coated paper, coated paper production required defoaming agent goods model is NOPCO, Sn and FBX and a variety of brands. But, at present domestic coated paper fire foam agent of the main active component points are usually of polyether, because polyether defoaming agent defoaming and foam suppressing function is very strong, very suitable for coating preparation process. It is well known that polyether defoaming agent of the very wide range of applications. It is not only paper industry indispensable auxiliary species, and has an important application in daily chemical, textile, oil, food, rubber, etc. in many industries.