Jianwei Xing

Synthesis of polypropylene carbonate polyol-based waterborne polyurethane modified with polysiloxane and its film properties

Waterborne polyurethane (WPU) prepolymer was synthesized using polypropylene carbonate polyol as the soft segment, dimethylolpropionic acid as a hydrophilic chain extender and isophorone diisocyanate. The prepolymer was modified with aminoethyl aminopropyl dimethicon (AEAPS) to prepare a series of WPU emulsions and films. The structures and the films properties of the WPUs were characterized by Fourier transform infrared spectrometry, gel permeation chromatography, atomic force microscopy, X-ray diffraction, thermogravimetric analysis, dynamic thermomechanical analysis, X-ray photoelectron spectroscopy, water contact angles and water absorption. It was found that pure polypropylene carbonate WPU had a wide molecular weight distribution and its microphase separation was not apparent between its hard and soft segments. The WPU also had a high glass transition temperature (24.5 °C) and its film had a high damping property (tan δ>0.40) from 12 °C to 42 °C. Modification with polysiloxane had enlarged the molecular weight, narrowed the molecular weight distribution and resulted in the microphase separation between the hard and soft segments of WPUs, and this amplified the damping temperature of the WPU films. Along with the increasing utilization of polysiloxane the thermolysis, water resistance and water contact angles of WPU films were improved while the orientation of their structure regularity declined.

Synthesis of blocking polyether silicone oil and silicone blocking waterborne polyurethane and application to cashmere knitted fabric finishing

Blocking polyether silicone oil is prepared through a reaction between amino-terminated polyether and epoxide-terminated polyether silicones. A fabric finishing agent made with cationic waterborne polyurethane modified by silicone oil is prepared by using polytetramethylene glycol as the soft segment, N-methyl diethanolamine as the hydrophilic unit, and tailor-made blocking polyether silicone oil as a chain extender for modification purposes. The finishing agent and the blocking polyether silicone oil are jointly used to treat cashmere knitted fabric. It is found that resistance to pilling of the treated cashmere knitted fabric is improved from a scale of 2–3 to 4 and its washing shrinkage rate is reduced from 11.2% to 3.3%. The treated cashmere knitted fabric has good hydrophilic ability, high water vapor and air permeabilities, and a soft handle. Moreover, the color of the fabric remains almost unchanged after finishing and the durability of the finishing properties is excellent.

Synthesis and Properties of Polypropylene Carbonate Polyol-Based Waterborne Polyurethane

Different kinds of anionic polyhydric alcohols water-borne polyurethane (WPU) emulsion and films were prepared by separately taking polypropylene carbonate polyol (PPC), polyethylene-1,4-buthylene adipate glycol (PBA) and polytetramethylene ether glycol (PTMG) with the same molecular weight as soft segment. Their structure and properties were characterized with Fourier transform infrared spectrometry (FT-IR), X-ray diffraction (XRD), rigidity, adhesive power, contact angle and water absorption. Comparing their properties, it was found that the rigidity, adhesive power and water resistance of PPC WPU were similar to those of PBA WPU.

Application of Micro-Suspended System in Bleaching Process of Natural Pigmented Animal Fiber

This paper introduces the application for micro-suspended system in the bleaching process of natural pigmented animal fiber, and compares the whiteness, strength, alkali solubility and subsequent dyeing property of the pigmented fiber after being bleached by traditional process and micro-suspended bleaching process respectively. The results of this study have suggested that adding micro-suspended chemical addictive in the bleaching process of natural pigmented animal fiber is able to protect fiber from damage, develop the fiber whiteness, improve the quality of the textile of this kind, and further enhance the fiber’s both subsequent spinnability and wear behavior.

Polymeric Shell with Low Permeability

A polymeric shell with low permeability was manufactured via a combined process including both an interfacial polymerization and an in-situ condensation. A polyisocyanate, tolylene diisocyanate (TDI) or 1,6-hexamethylenediisocyanate (HDI), was added in the core compositions as a reactive monomer for the formation of both polyurethane wall and polyurea wall. PPG-2,000, a polypropylene glycol, was employed as another reactive monomer to form the polyurethane wall. Melamine-formaldehyde precondensate was prepared and used as the raw material for the aminoplast wall formation. The polymeric shell thus consists of three walls, which includes a polyurethane inner wall, a polyurea middle wall and an aminoplast outer wall. The triple-walled shell has proven to possess low permeability and then wrap the paraffin compounds tightly.