Preparation method of medical polyurethane with adjustable surface wettability

[0073] Under the protection of nitrogen at room temperature, add the dried PCL dibasic alcohol (R=-(CH 2 CH 2 O) 3 CH 3 , R'=-(CH 2 ) 6 -, degree of polymerization = 10, M n = 1,380 g / mol, M w / M n =1.14, product of Shenzhen Xin Element New Material Technology Co., Ltd.) 138g, heated until completely melted, then started stirring, added HDI16.8g and stannous octoate 40.5mg, and continued to stir for 2 hours. Take out product, measure number average molecular weight (M n =5,600g / mol) and molecular weight distribution (M w / M n = 1.31). Take a certain amount of product and melt it in a 2cm×2cm square glass dish, and measure the wettability of the bottom smooth surface after cooling (contact angle=23.2°).

[0075] Under the protection of nitrogen at room temperature, add the dried PCL dibasic alcohol (R=-(CH 2 CH 2 O) 3 CH 3 , R'=-(CH 2 ) 6 -, degree of polymerization = 20, M n = 2,520 g / mol, M w / M n =1.15, product of Shenzhen Xin Element New Material Technology Co., Ltd.) 126g, heated until completely melted, then started stirring, added HDI8.4g and stannous octoate 20.2mg, and continued to stir for 1.5 hours. Take out product, measure number average molecular weight (M n =7,300g / mol) and molecular weight distribution (M w / M n = 1.15). Take a certain amount of product and melt it in a 2cm×2cm square glass dish, and measure the wettability of the bottom smooth surface after cooling (contact angle=29.1°).

[0077] Under the protection of nitrogen at room temperature, add the dried PCL dibasic alcohol (R=-(CH 2 CH 2 O) 3 CH 3 , R'=-(CH 2 )6 -, degree of polymerization = 30, M n = 3,660 g / mol, M w / M n =1.16, product of Shenzhen Xin Element New Material Technology Co., Ltd.) 122g, heated until completely melted, then started stirring, added HDI5.6g and stannous octoate 13.5mg, and continued to stir for 2 hours. Take out product, measure number average molecular weight (M n =13,000g / mol) and molecular weight distribution (M w / M n = 1.36). Take a certain amount of product and melt it in a 2cm×2cm square glass dish, and measure the wettability of the bottom smooth surface after cooling (contact angle=73.4°).