Application of nano materials in polyurethane coatings and adhesives

At present, nanotechnology has been widely used in the polyurethane industry, and has achieved gratifying results, and some have even completed industrialization and created huge economic benefits.

1 polyurethane coating

Polyurethane coatings have excellent corrosion resistance, elasticity, wear resistance and insulation properties, and are widely used. However, its suspension stability, thixotropy, weather resistance and the like are low. The introduction of nanoparticles into polyurethane coatings can significantly improve the above defects, and at the same time improve the hardness, toughness, compactness, transparency, scratch resistance, heat resistance, corrosion resistance and water resistance of the coating film.

Shanghai Aerospace Technology Research Institute No. 806 research, such as hydroxyl terminated butadiene (HTPB), toluene diisocyanate (TDI) and related additives as raw materials, using nano-CaCO3 as a filler, prepared a one-component polyolefin polyurethane coating. The coating has good process performance and storage stability, and has good mechanical properties, bonding strength and good aging resistance after curing.

2 polyurethane adhesive

Polyurethane adhesive has high initial adhesion, soft rubber layer, excellent peel strength, flexural strength, torsion resistance and impact resistance, and is resistant to cold water, oil, acid and abrasion. It can not only be at room temperature. It is cured under the heat and can also be cured by heat, but the heat resistance is poor. The addition of nanoparticles to the adhesive significantly improves the heat resistance, tensile strength, shear strength, peel strength, and the like.

In Shanghai Xinfeng Chemical Research, the polyurethane prepolymer of the NCO group at both ends is a component A, and the curing agent E-300 is a component B. A special adhesive for ethylene-based two-component waterproof material of EPDM is prepared. The physicochemical properties are excellent, the aging performance is stable, the tensile strength, the shear strength, the peel strength and the elongation at break of the sample are improved, and the rheological and thixotropic properties of the adhesive can also be controlled.

The Department of Chemical Engineering of Tsinghua University studied the effects of CaCO3 on the mechanical properties and rheological properties of silicone modified polyurethane sealants. The results show that the nano-CaCO3 has better elasticity and thixotropy than the heavy CaCO3. Nano-diamond powder has excellent wear resistance due to its high strength, low friction coefficient and polycrystalline properties. Beijing Tiangong Surface Materials Technology Co., Ltd. prepared nano-diamond/polyurethane adhesive, which improved the wear resistance by 2.24 times compared with the simple polyurethane adhesive, and the tensile strength also increased by 27.8%.

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