Preparation and performance of water dispersion and curing film for polyurethane polyol

Oily solvent-type polyurethane contains a large amount of organic volatile solvents, most of which are harmful to the human body, such as toluene, nitrite, DMF, etc.; solvent-free liquid polyurethane contains a certain concentration of free-NCO, which has strong toxicity; In comparison, water-based polyurethane is more friendly, environmentally friendly, safe and non-toxic. 

Water-based polyols need to have good dispersibility, mix evenly with polyisocyanate curing agent components with low shear energy consumption , and ensure that the cured coating film has excellent properties, such as high shear modulus, strong adhesion, etc. performance. In the two-component water-based polyurethane system, polyurethane polyol is a relatively satisfactory polyol component. The proportion of urethane bonds in the molecular chain of polyurethane polyol film can be changed. performance. In this chapter, polyurethane polyol aqueous dispersion was prepared by prepolymer method, and compounded with hydrophilic polyisocyanate curing agent to form a film . The raw material formula was optimized by single factor experiment method, and the effects of W, DMPA dosage, TMP dosage, Rt W and neutralization degree on the performance of HPUA and 2K-WPU coating films were focused on, and the two-component system n-NCo/ The effect of n_OH and curing temperature on the properties of coating film.

Experimental equipment

Electronic Constant Speed ​​StirrerGS12 -IIShanghai Medical Equipment Factory

Constant temperature Oil BathHH -SAGuohua Electric Co., Ltd.

Electric Forced Air Drying OvenHG101-1 (1A/1AD)Nanjing Yingzhu Experimental Instrument Co., Ltd.

Vacuum Drying OvenDZ -1BCTianjin Test Instrument Co., Ltd.

Fourier Transform Infrared SpectrometerNicol Magic Design 10ThermoFisher Company

Fully digital NMR spectrometerAvance MountainRui ±Bruker Company

Rotational ViscometerNDJ -1Shanghai Tianping Instrument Factory

Particle size analyzerZetasizer3000HSMalvern , UK

CentrifugeLDZ4-0Beijing Medical Centrifuge Factory _

Water Contact Angle MeterSL200Korno Industries Co., Ltd.

Miniature Controlled Electronic Multifunctional Testing MachineCMT -2000Shenzhen New Hsi Materials Co., Ltd.

Paint Film ImpactorQCJTianjin Jingke Material Testing Machine Factory

Pencil Hardness TesterQHQTianjin Jingke Material Testing Machine Factory

Thermal AnalyzerTGA /SDTA851eRui ±MettlerToledoCompany

Rotary Vane Vacuum System2S -2Nanjing Vacuum Spring Factory

Circulating water vacuum cableSHZ -D(III) Gongyi Yuhua Instrument Co., Ltd.

Rotary EvaporatorRE -85ZGongyi Yuhua Instrument Co., Ltd.

Ultrasonic CleanerKQ -250BKunshan Ultrasonic Instrument Co., Ltd.

High Shear Haihe EmulsifierBME -100LXShanghai Weiyu Electromechanical Manufacturing Co., Ltd.

Electronic Balance TD -2102 Tianjin Tianma Hengji Instrument Co., Ltd.