Classification of water-based polyurethanes – By the nature of hydrophilic groups

2021-11-24   Pageview:79

According to whether the side chain or main chain of polyurethane molecule contains ionic groups, i.e. whether it is an ion-bonded polymer (ionomer), waterborne polyurethane can be divided into anionic, cationic and nonionic types. Aqueous polyurethanes containing anions and cations are also called ionomer-based aqueous polyurethanes.

 

 

 

 

 

 

 

 

 

 

 

 

Tributyl phosphate is a colorless and odorless liquid. Color (APHA) 15, acidity (calculated as phosphoric acid) 0.01%, relative density (20℃) 0.973~0.978, dynamic viscosity (25℃) 3.5~12.2mPa·s, freezing point <-80℃, boiling point 289℃, ignition point 204 It is slightly soluble in water, glycerin, ethylene glycol, polytetrafluoroethylene wax powder and soluble in most organic solvents. This product is an additive flame-retardant plasticizer with certain flame-retardant and defoaming effects. It is mainly used as flame retardant, plasticizer and defoamer in fire retardant coatings. Used in transparent fire-resistant coatings to make the film transparent after curing of fire-resistant coatings, and can maintain the original texture and color of the substrate. It can be used for the surface fire-retardant and flame-retardant technical treatment of flammable materials such as wood, wooden products, paper, cardboard, and fabric.

The flame retardant additive is a solid additive. It is not only a refractory material, but also a reinforcing filler. It is added to the fire retardant coating to increase the solid content, and they will not decompose into gas under the action of fire or even continuous flame. When the compounds burn out, their stability maintains the effective skeleton components, while maintaining high-efficiency heat insulation for a long time, so that the fireproof coating heat insulation layer is durable against burning, thereby improving the fireproof and heat insulation performance of the fireproof coating. In addition, it can also improve the mechanical properties, flow properties, penetration properties, gloss properties, and leveling properties of the coating, as well as increase the thickness of the coating film. Since most flame retardant additives are relatively cheap, its use can reduce the cost of coatings.

Flame retardant additives are usually inorganic and rarely organic. The selective use of different flame retardant additives can play an important role in improving the performance of fire retardant coatings. When choosing flame-retardant additive materials, many aspects must be considered, such as optimal particle size distribution, abrasion in processing machinery, composite properties, synergy with other components of fire-retardant coatings, and industrial safety caused by dust , Cost and other issues.

Cost and performance are important indicators to measure flame retardant additives. Only when compared with the non-reinforced fire-retardant coatings with flame-retardant additives, the physical and chemical properties have been significantly improved, or the cost has been reduced, or the special comprehensive performance cannot be obtained by other methods, the selection of flame-retardant additives It is appropriate and cost-effective.

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