AKD sizing agent

Alkyl ketene dimer (AKD) is most common neutral/ alkaline sizing agent. It is an Internal sizing agents. Structurally, it is unsaturated lactones and it is synthesized from fatty acids. Physically it is waxy like milky emulsion chemicals. The waxy solid tiny particles (0.5–2 mm) are dispersed into water and the emulsification are stabilized by the cationic starch or another cationic polyelectrolyte stabilizer.

The reactive lactones rings of AKD can easily goes under chemical reaction. It reacts with the hydroxyl groups of cellulose and forming an ester bond (b-keto esters).

The availability and the reasonably priced of calcium carbonate makes it the popular filler material. But this filler material is unstable in acidic medium, hence the usage of neutral/alkaline sizing agent are increased.
Recent years AKD is the most extensively used reactive sizing agent in the high quality printing papers production.

Alkaline sizing agent improves surface conditions of paper. The Neutral/Alkaline Sizing Agent (AKD) also reduces paper machine breakdown and water recycling difficulties compare to Acidic sizing agent.

The function of AKD sizing agent depends on different technological parameters such as ph value of the fiber suspension, raw materials, method of drying, temperature, time etc. AKD is much less reactive than ASA; hence it is more flexible for papermakers during usages. It means that it can be add to the thick or thin stock. However the presence of PCC in the system can lessen the efficiency of the sizing agent.

It should be followed the manufacturers instruction during storage especially temperature and time since AKD is slowly hydrolyzed.

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8 Responses to AKD sizing agent

  1. Nadiah says:

    Hi!

    May I know where can I purchase AKD in small amount (I need less than 3 kg)? I’m doing research on paper and interested to use this chemical to manipulate the paper surface. However, no chemical company sell this in small quantity. Is it possible to get AKD from hardware stores?

    Thanks in advance!

    • Wendy says:

      Hi, this is Wendy from Weifang Greatland Chemical Co.,Ltd.

      We has been in paper chemical profession for more than 10 years, We own the largest AKD product line in China, which can produce AKD with highest purity(92%purity)and national standard purity(88% purity). hope we can support you and build business relationship on mutual benefits.

      My skype name is amethystbelle, if you need any help, just feel free to contact me.

  2. upendra says:

    good artical but required more detail

  3. Ricky Gagne says:

    Can adk cause build up in head boxes and be released and cause dark spots and even holes

  4. Baramki fadl says:

    We are begging a new production of carton paper recycle board , use in shoe industry
    as insole in the shoe
    We have two different problems
    1- the finish carton paper board , absorb too much water when the shoe maker use it
    So we need to have a board that does not absorb too much water
    2- the carton board is not flexible enough and easy to broke ! Need to have it more flexible

    We want to know what we can add in the production line ? Chemical ? And where in the line , during mixing ? Or before the dryer ? ….

    Rgds
    Baramki

  5. abdelfattah says:

    Can we use AKD in production of sack kraft paper
    where this kind of paper need high quality mechanical
    properties?

    many thanks

  6. PRASAD.KODURI says:

    Can we use this AKD in fiber cement Production line to make boards less porous?
    AKD is having any adverse affects with cement matrix?

  7. Adams says:

    What percentage of AKD filler is needed to apply to one tons of paper making

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