Waterborne hyper-branched polyurethane coating agent
A water-based polyurethane and coating agent technology, applied in the field of textile chemical industry, can solve the problems of poor coating flexibility, poor stability and low solid content, and achieve the effects of high solid content, good stability and low viscosity
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[0035] Preparation of SWHBPU-PU film sample: Cast the SWHBPU-PU emulsion into a film in a mold with a film thickness of about 1mm. Dry it naturally for one week, and place it in a vacuum oven at 60°C to vacuum dry to constant weight, then take it out and place it in a desiccator spare.
[0036] In order to verify the improvement of the shear viscosity and flexibility of SWHBPU-PU emulsion, a blank sample XA was prepared for comparison in each case. XA is the corresponding linear waterborne polyurethane without SWHBPU added.
Embodiment 1
[0038] (1) Synthesis of WHBPU
[0039] Add 17.8g IPDI to the reaction flask and heat it to 65°C. After dissolving 5.4g DMPA in 27mL DMF, add it to the reaction flask containing IPDI and keep it at 65°C for 8 hours; then lower the reaction system temperature to -10°C. Add 4.2g DEOA dropwise to the reaction system. After the addition is complete, keep at -10°C and continue the reaction for 4h; then raise the temperature of the reaction system to 90°C, and add 0.027g of dibutyltin dilaurate as a catalyst and keep it at 90°C The reaction was continued for 3 hours to obtain a colorless transparent liquid, which was distilled under reduced pressure at 70°C for 15 minutes and dried to obtain the desired WHBPU.
[0040] (2) Synthesis of SWHBPU
[0041] Take 10g of WHBPU obtained in step (1) and mix 40g of stearic acid and place it in a reaction flask, and add 0.1g of concentrated sulfuric acid as a catalyst to the mixture; then add the above mixture to 250mL of pyridine. After reacting at ...
Embodiment 2
[0049] (1) Synthesis of WHBPU
[0050] Add 8.8g IPDI to the reaction flask and heat it to 60°C. After dissolving 1.61g DMPA in 8mL DMF, add it to the reaction flask containing IPDI and keep it at 60°C for 10 hours; then reduce the temperature of the reaction system to -15 ℃, add 1.69g DEOA dropwise to the reaction system. After the addition is complete, keep at -15℃ and continue to react for 4h; then increase the temperature of the reaction system to 80℃, and add 0.605g of stannous octoate as a catalyst, keep at 80℃ The reaction was continued for 5 hours to obtain a colorless transparent liquid, which was distilled under reduced pressure at 70°C for 15 minutes and dried to obtain the desired WHBPU.
[0051] (2) Synthesis of SWHBPU
[0052] Take 10g of WHBPU obtained in step (1) and mix 38g of palmitic acid and place it in a reaction flask, and add 2.4g of toluenesulfonic acid as a catalyst to the mixture; then add the above mixture to 220mL of pyridine, React at 110°C for 5 hours t...
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