The Instruction of Poly(hexamethylenebiguanide)

Poly(hexamethylenebiguanide) (PHB) is a biodegradable thermoplastic polyurethane (TPU) that is widely used in the chemical industry.
PHB is a synthetic polymer that is made by the reaction of hexamethylene diamine with adipic acid.
The resulting polymer is a tough, flexible, and durable material that is ideal for a wide range of applications in the chemical industry.
In this article, we will discuss the instruction of PHB in the chemical industry.

1. Raw Material Selection
   PHB is made from two key raw materials: hexamethylene diamine and adipic acid.
   The selection of these raw materials is critical to the quality and performance of the final product.
   In order to ensure consistent quality, it is important to use high-purity raw materials that meet all relevant specifications.
   It is also important to ensure that the ratios of the raw materials are correct, as this can affect the properties of the final product.
   
2. Preparation of the Raw Materials
   Before the polymerization reaction can take place, the raw materials must be prepared.
   This typically involves the dissolution of the raw materials in a solvent, such as dimethylformamide (DMF), and the removal of any impurities.
   The resulting solution is then GBP (glycol Bruce potential) value, Karl Fischer titration, and viscosity need to be tested to ensure that it meets the required specifications.
   
3. Polymerization Reaction
   The polymerization reaction is the key step in the production of PHB.
   In this reaction, the hexamethylene diamine and adipic acid react to form the polymer.
   The reaction is typically carried out in a reaction vessel, using a catalyst such as sodium hydroxide or sodium metabisulfite.
   The conditions for the reaction, such as the temperature and pressure, must be carefully controlled to ensure that the reaction proceeds smoothly and efficiently.
   
4. Polymer Characterization
   After the polymerization reaction is complete, the polymer must be characterized to determine its properties and quality.
   This typically involves measuring the molecular weight of the polymer, the melting point, and the glass transition temperature.
   The polymer may also be tested for mechanical properties, such as tensile strength and elongation at break.
   
5. Purification of the Polymer
   After the polymer has been characterized, it may need to be purified to remove any impurities that may have been introduced during the production process.
   This may involve steps such as precipitation, filtration, and washing.
   
6. Extrusion and Shaping
   The final step in the production process is the extrusion and shaping of the polymer into the desired shape or form.
   This is typically done using an extruder, which melts the polymer and shapes it into a desired shape, such as a film, a sheet, or a profile.
   The properties of the polymer, such as the melting point and the viscosity, must be carefully controlled to ensure that the extrusion process is efficient and produces consistent results.
   

In conclusion, PHB is a versatile and widely-used material in the chemical industry, it can be used in various application such as in the production of plastic containers, films, and fibers, and it can also be used in the production of biodegradable plastics.
To ensure consistent quality, it is important to carefully control the production process, from the selection of raw materials to the extrusion and shaping of the final product.
With the right techniques and equipment, PHB can be produced to meet the specific needs of a wide range of applications in the chemical industry.