Alkyl Ketene Dimer

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. It has less corrosive to the papermaking machine than acid sizing. For cultural paper and packing paper. CM Chemical has developed the following products. Advantage Alkaline sizing system reduces corrosion of paper machine equipment. Less foam produced by the approach system than the acidic rosin system. AKD pulp sizing cost less than rosin sizing. Hard- sizing can be applied, and the stocking sizing degree is proportional AKD usage. Features Mature production process, easy application, simple adding equipment. High self-retention, good sizing effect, fast curing rate. Strong anti-interference and good stability. Good anti-moisture effect for the paper, can effectively prevent the reduction of RCT.

AKD wax introduction Chemical name: Alkyl Ketene Dimer Alias: AKD wax AKD powder is also called AKD wax. Chemical name is Alkyl ketene dimer. CAS registration number is 144245-85-2. Appearance is pale yellow flake or granular solid. It is produced by fatty acid (C16), via acylation and dehydrochlorination to become AKD wax. AKD wax is mainly used for papermaking neutral sizing agent. R or R' in the above structural formula is the alkyl group, and a series of alkyl ketene dimers can be obtained through modifying different alkyl groups. Octodecane and cetane are applicable to the papermaking neutral sizing agent. Alkyl ketene dimer is a white-to-yellow solid with the melting point of about 47 ~ 51 , which can be soluble in ethyl alcohol, benzene, chloroform and other organic solvents. The reactive group of alkyl ketene dimer-ketone group has high activity and makes esterification reaction with the hydroxyl in cellulose. Product Application AKD wax can be made into AKD emulsion applied as in sizing agent in the papermaking production. AKD wax is emulsified by the cationic emulsifier, and melted AKD wax and emulsifier undergo high-speed shearing and high pressure homogenization to form the liquid AKD sizing agent after cooled. In the papermaking process, application of AKD sizing agent gives the fluid resistance to paper and paperboard to prevent or delay the penetration and diffusion of some liquids on paper fibers, thus satisfying people's requirements on the processing and use of paper products. AKD contains hydrophobic group and hydrophilic group, which are well distributed in the sizing process to transfer to locate the process of bonding with cellulose. AKD emulsion particles stay between negatively charged paper fibers since they carry with positive charge by virtue of cationic starch and PAM and other retention agents; In the pressing and drying process of the paper machine, these globular AKD particles are easily expanded and distributed on the surface of fibers due to the lower melting point to form a homogeneous cover film; When paper is dried and stored for a period, the active group (lactone ring) on AKD molecule makes the esterification reaction with the hydroxyl on fibers under certain conditions to be binding on fibers in the form of fixed covalent bonds. Hydrophobic long-chain alkyls transfer to the paper surface in order to give the penetration resistance to paper.

AKD wax(Alkyl ketene dimer) for akd emulsion used as paper internal sizing agent AKD wax, alkyl ketene dimer wax, can be divided into 3 models: AKD 1840, AKD 1865 and AKD 1895, is mainly used for internal sizing of various paper, such as copper plate base paper, copy paper, archival paper, high quality writing paper and corrugated paper. AKD wax is usually used together with AKD emulsifier, AKD dispersant, AKD stabilizer to make AKD emulsion. AMAZON provide technical support for new customers in AKD emulsion production process. HS CODE: 39049014 Product Name AKD 1840 AKD 1865 AKD 1895 Appearance Slight yellow bead Slight yellow bead Slight yellow bead AKD content (%) 90% 90% 90% Acid value (mgKOH/g) 5 5 5 Melting point (°C) 47 50 60 Iodine value (g12/100g) 45 44 43

Supplier: Alkyl ketene dimer (akd wax) akd emulsion, emulsifier
Buyer: Stearic acid

AKD PLUS- 15 is a reactive size based on alkyl ketene dimer. It is stabilized with cationic polymer and finely emulsified, contains a higher alkyl ketene dimer content. Features - Reduce the likelihood of size reversion and increase sizing performance for paper and paper board at neutral/ alkaline conditions - With low viscosity and cationic charge, it is easily dispersed and directly reacted with cellulose fiber for better sizing degree. It can be compatible with almost retention aid systems applied in paper mills - Maximum sizing effiency is only reached together with a good retention system which can also improve fiber, fiber retention and dewatering as well

Supplier: Modified tapioca starch and native tapioca starch from Thailand and also provides chemicals used in pulp & paper mills such as akd (alkyl ketene dimer) pulp sizing agent, surface sizing agent, dry strength agent, wet strength agent, cationic rosin size, defoamer,
Services: Manufacturer and exporter

Defoamer is a special polyether compound defoamer for papermaking. It has de-foaming and antifoaming properties with strong surfactant action and long duration. It can control the whitewater system foam of newsprint, cultural paper and wrapping paper machine, improve the dewatering ability, and control the foam of the sizing system without affecting the sizing performance. This product is free of mineral hydrocarbons and is an eco-friendly product. Advantage: Defoamer has strong de-foaming, anti foaming and degassing capabilities and lasts for a long time. Defoamer has good compatibility and does not conflict with other chemicals in the papermaking system. Can effectively improve dehydration, reduce pinholes and bubbles on paper, reduce the frequency of paper breaks, and improve production efficiency. Can improve the retention rate and reduce the load on the pump, pressure screen. Features: Defoamer product is a low viscosity and a facility to spread rapidly on foamy surfaces. It has affinity to the air-liquid surface where it destabilizes the foam lamellas. This causes rupture of the air bubbles and breakdown of surface foam. Entrapped air bubbles are agglomerated, and the larger bubbles rise to the surface of the bulk liquid more quickly.

ANIONIC POLYACRYLAMIDE The polyacrylamide powder particles with anionic charge is suitable for different papermaking sewage floatation solid-liquid separation and sludge filtration dehydration according to the degree of hydrolysis. CATIONIC POLYACRYLAMIDE According to the different degrees of cation, the cationic charge of polyacrylamide powder particles are applied to different papermaking sewage flotation and sludge filtration. For the solid-liquid separation of papermaking wastewater, cationic polyacrylamide can effectively collect the solid content to form large and strong floc which can achieve ideal air flotation and sedimentation effect to ensure. The clarity of the filtrate. For the sludge filter dehydration, cationic polyacrylamide can effectively help form large and strong floc to remove water in the sludge and improve the dryness of sludge residue. Advantage: Removal of heavy metals and chemicals. Residual protection against contamination. Visual improvement of water and acceptability. Features: Cationic and anionic flocculants and thus can be used in a wide pH range. It is suitable for the treatment of wastewater, which is difficult for a single chargeable flocculant, especially in water-soluble dye wastewater decolorization.