Anionic waterborne polyurethane can be further divided into sulfonic acid type and carboxylic acid type, with most containing ionic groups in the side chains. Most waterborne polyurethanes incorporate carboxylate ions and sulfonic acid ions by using carboxyl-containing or sulfonate-containing chain extenders.
⑵Cationic waterborne polyurethane generally refers to waterborne polyurethane containing ammonium ions (usually quaternary ammonium ions) or thallium ions in the main chain or side chains, with quaternary ammonium cations being the most common. The preparation of waterborne polyurethane containing ammonium ions in the main chain typically uses chain extenders with tertiary amine groups, where tertiary amines and secondary amines are converted into hydrophilic ammonium ions through the action of acids or alkylating agents. Ammonium ions can also be formed by the reaction of polyurethane containing amino groups with acids.
③ Non-ionic waterborne polyurethane, which is waterborne polyurethane that does not contain ionic groups. Preparation methods for non-ionic waterborne polyurethane include: ① High-shear force forced emulsification of ordinary polyurethane prepolymer or polyurethane organic solution in the presence of an emulsifier; ② Formation of molecules containing non-ionic hydrophilic chain segments or hydrophilic groups, where hydrophilic chain segments are generally medium to low molecular weight polymers, and hydrophilic groups are typically... ④ Blended polyurethane resin molecular structures have both ionic and non-ionic hydrophilic groups or chain segments.
Carbon black is widely used as a pigment, filler, reinforcing pigment, and weatherability modifier. The generally known preparation method involves introducing oxygen-containing gas and fuel into the reaction zone of a cylindrical carbon black preparation furnace along the furnace axis or tangential direction. Subsequently, the high-temperature combustion gas stream obtained after combustion is continuously transferred to the second reaction zone set along the furnace axis, while hydrocarbons as raw materials are introduced into the gas stream to produce carbon black. Finally, the reaction is terminated by rapidly cooling the reaction gas in the third reaction zone using a furnace-type manufacturing method.
The carbon black used as a colorant in resins, printing inks, and paints should have good blackness, dispersibility, luster, and coloring ability. Additionally, for use as a reinforcing agent in automotive tires, it is required to have excellent wear resistance.
Carbon black particles typically exist in a fused state, resembling a string of dumplings where particles blend together. Each spherical particle forms peaks and valleys like dumplings, and when considered as a single particle, its particle size is closely related to its performance for various applications, such as reinforcing and darkness.
Same.
Most waterborne polyurethanes are thermoplastic polyurethanes, which can be bonded using hot melt adhesive methods. In this case, it is necessary to master the melting viscosity characteristics of polyurethane. Generally, a melting viscosity of around 104 Pa·s is a suitable hot melt bonding temperature.
5. Other
(1) Velvet Processing: In velvet processing, adhesives must have high adhesion to PVC substrates or fabrics. Velvet fabric requires the formed velvet layer to be resistant to dry and wet washing, water-based polyurethane adhesives, and to secondary processing. Static velvet processing poses a fire hazard; water-based adhesives are mandatory. Water-based polyurethane exhibits excellent flexibility, soft adhesive layers, and can be used as a velvet adhesive. The performance of water-based polyurethane with internal cross-linking or water-based adhesives with added cross-linking agents exceeds that of ester adhesives. As a velvet adhesive, thickening is necessary.
For example, an anionic polyurethane made from polyether diol, DMPA, polyester plasticizers, a small amount of trihydroxyl cross-linking agent, antioxidant, and triethylamine, thickened to 48 Pa·s with a polyacrylic thickener, applied to twill cotton fabric, with a wet adhesive layer thickness of 0.25mm, water-based polyurethane adhesive, sprinkling 1mm long artificial silk within 15-30 seconds, directing the nap with a beating rod, dried at 150-155°C for 5 minutes, Shandong water-based polyurethane, blowing off unadhered fibers, yields a velvet product with a soft fabric feel. After dry and wet wipe tests, the performance evaluation is Grade A.
Shandong Waterborne Polyurethane - Wrinkle Aid Manufacturer - Waterborne Polyurethane Adhesives are supplied by Zhejiang Luoxing Chemical Co., Ltd. Strive for the distant road, forge ahead. Zhejiang Luoxing Chemical Co., Ltd. is committed to becoming a strategic partner that wins together, grows together, and moves forward together with you, and is determined to become a competitive enterprise in polyurethane raw materials. Let's soar together and achieve success! Meanwhile, we are also a manufacturer of Zhejiang PU leather, Guangzhou PVC leather producer, and Wenzhou leather goods wholesaler. Welcome to call for inquiries.
