4-functionality-degree polycaprolactone urethane acrylate and preparation method and application thereof

[0028] Example 1

[0029] Put 320 grams of polycaprolactone tetraol, 282 grams (2 mol) of ethyl acrylate isocyanate, 0.36 grams of dibutyltin dilaurate as catalyst, 1.2 grams of p-hydroxyanisole as polymerization inhibitor in a 1000 mL four-necked flask, 0.5 to 4 hours Slowly increase the temperature to 80°C-85°C for 3 to 5 hours to heat and discharge the material to obtain the 4-functional polycaprolactone urethane acrylate with the structure shown in the following formula.

[0030]

[0031] Among them, the polycaprolactone tetraol of this embodiment is composed of pentaerythritol and 6-caprolactone monomer (CAS number: 502-44-3, molecular formula: C 6 H 10 O 2 , Molecular weight: 114.14) prepared by ring-opening polymerization under the action of an organometallic catalyst, hydroxyl value: 350 mgKOH / g, molecular weight: 640. The structure of polycaprolactone tetraol is shown in the following formula:

[0032]

[0033] a+b+c+d=(640-136) / 114=4.4211.

[0034] Example 2

[0035] Put 500 grams of polycaprolactone tetraol (Perstorp CAPA4101, molecular weight 1000) into a 1000mL four-necked flask, 282 grams (2mol) of ethyl isocyanate acrylate, 0.5 grams of dibutyltin dilaurate as a catalyst, and polymerization inhibitor p-hydroxybenzene 1.5 grams of methyl ether, slowly warmed to 80°C-85°C for 0.5 to 4 hours, heat preservation and reaction for 3 to 5 hours, and discharged to obtain the 4-functional polycaprolactone urethane acrylate represented by the following formula structure.

[0036]

[0037] a+b+c+d=(1000-136) / 114=7.5789.

[0038] Example 3

[0039] The 4-functional polyurethane acrylate was prepared by the preparation method of Example 1-2 provided in Chinese Patent ZL201310143167.9, as Comparative Example 1-2, and obtained by investigating Example 1-2 of the present invention and Comparative Example 1-2 The viscosity of the 4-functional urethane acrylate.

[0040] Test method: NDJ-1 type rotary viscometer, No. 4 rotor, 60 revolutions per minute. For specific operation steps, please refer to "NDJ-1 Rotary Viscometer Operation Manual".

[0041] Table 1 Viscosity of 4-functional polycaprolactone urethane acrylate

[0042]

[0043] The viscosity of the product of Example 1 was lower than that of the product of Comparative Example 1 by 5400 mPa.s@60°C, and the decrease range was 45.00%.

[0044] The viscosity of the product of Example 2 was lower than that of the product of Comparative Example 2 by 6400 mPa.s@60°C, and the drop rate was 42.67%.