Dihydroxyethyl glycine, referred to as Bicine, is a polyol glycine analog, usually used as a biological buffer in biochemical testing, cosmetics or paint. In addition, Bicine can also be used to modify some new materials, such as the reduction of metal aluminum ions in the polymeric material polyetherketoneketone (PEKK).
Bicine complex metal ion
We know that when Bicine is used as a buffer, it has strong or weak complexing ability for some metal ions, which is the characteristic of its molecular structure. The Bicine molecule contains two alcoholic hydroxyl groups, a carboxyl group and a lone electron pair on the nitrogen atom of the nitric group. They can form coordination bonds with some metal ions, and can complex (chelate) specific metal ions. Some metal ions. Therefore, it is used to reduce aluminum ions in the refining process of crude polyetherketoneketone.
Introduction to polyether ketone ketone
This is a polyarylether polymer composed of repeating units containing two ketone bonds and one ether bond in the main chain structure. It is a special polymer material. PEKK has excellent resistance to extreme environments (aerospace and petroleum exploitation), has a very high melting point (300℃-360℃, softening point 168℃), chemical resistance and corrosion resistance; tensile strength 132～148MPa, can Used as a high temperature resistant structural material and electrical insulation material, the hardness is comparable to metal and lighter in weight, non-flammable and does not produce toxic gases; it is very easy to shape above the melting point, and can also be processed by injection molding or extrusion processes. membrane.
Bicine chelates aluminum ion in crude polyetherketoneketone:
Mix the crude polyether ketone ketone with the ethanol solution of diphenyl sulfone, and heat to reflux;
Add the dihydroxyethylglycine aqueous solution to the above system, continue to heat and reflux, and filter after cooling to obtain the primary product of polyether ketone ketone;
Put the polyether ketone ketone primary product and deionized water into a container for ultrasonic treatment, filter the ultrasonicated material mixture with a centrifuge to remove water, and dry it to constant weight under vacuum at 130°C to obtain purified polyether ketone ketone.
After polyether ketone ketone is fully swollen in the ethanol solution of diphenyl sulfone, it is chelated with Bicine aqueous solution and combined with high-frequency ultrasonic treatment to reduce the metal aluminum ion in the crude polyether ketone ketone to less than 30 ppm. The high temperature of polyether ketone ketone The stability is significantly improved. Desheng is a manufacturer of biological buffers, which can provide high-quality bishydroxyethyl glycine Bicine raw materials.