Preparation method for organic-inorganic hybrid skin-friendly efficient sunscreen product
A friendly and inorganic technology, applied in skin care preparations, cosmetic preparations, cosmetics, etc., can solve problems such as skin damage, and achieve the effects of adjustable size, good dispersion and good sun protection effect.
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[0028] Example 1
[0029] Using polyethylene glycol monomethyl ether (PEO-Br) brominated at one end as initiator, cuprous bromide (CuBr)
[0030] As a catalyst, PMDETA is a ligand, anhydrous methanol is a solvent, and dimethylaminoethyl methacrylate (DMA) with a molar ratio of 10:1 to the initiator is used as a monomer, under anhydrous and oxygen-free conditions at 30°C Carry out atom transfer radical polymerization to obtain two-block polymer PEO 43 - b -PDMA 10 After the reaction is carried out for 12 hours, the monomer styrene (Styrene) with a molar ratio of 80:1 to the macroinitiator is added and the reaction is continued for 20 hours at a temperature of 110°C to obtain an amphiphilic triblock polymer PEO 43 - b -PDMA 10 - b -PS 80 .
[0031] Will PEO 43 - b -PDMA 10 - b -PS 80 The triblock polymer was dissolved in THF at a concentration of 50 mg / mL, and absolute ethanol was added dropwise for self-assembly. The concentration of the polymer nanoparticle solution obtained after...
Example Embodiment
[0035] Example 2
[0036] PEO-DDMAT with azobisisobutyronitrile (AIBN) as the initiator and the molar ratio of 1:5
[0037] It is a chain transfer agent, anhydrous tetrahydrofuran (THF) is a solvent, and dimethylaminoethyl methacrylate (DMA) with a molar ratio of 40:1 to the initiator is used as a monomer, and it is anhydrous and oxygen-free at 70℃ After 12 hours of reaction, styrene was dissolved in p-xylene and added to the reaction vessel to continue the reaction for 24 hours to obtain the amphiphilic triblock polymer PEO 43 - b -PDMA 40 - b -PS 30 .
[0038] Will PEO 43 - b -PDMA 40 - b -PS 30 The triblock polymer was dissolved in dichloromethane at a concentration of 30 mg / mL, and absolute ethanol was added dropwise to perform self-assembly. The concentration of polymer nanoparticles obtained after stirring for 50 h was 2 mg / mL.
[0039] Ethyl titanate was dissolved in absolute ethanol at a concentration of 5mg / mL, and dropped into a solution of polymer nanoparticles with a...
Example Embodiment
[0040] Example 3
[0041] Using polyethylene glycol monomethyl ether (PEO-Br) brominated at one end as initiator, cuprous bromide (CuBr)
[0042] As a catalyst, PMDETA is a ligand, anhydrous methanol is a solvent, and dimethylaminoethyl methacrylate (DMA) with a molar ratio of 60:1 to the initiator is used as a monomer, under anhydrous and oxygen-free conditions at 30°C Carry out atom transfer radical polymerization to obtain two-block polymer PEO 43 - b -PDMA 60 After the reaction was carried out for 8 hours, the monomer styrene with a molar ratio of 120:1 to the macroinitiator was added and the reaction was continued for 20 hours at a temperature of 110°C to obtain an amphiphilic triblock polymer PEO 43 - b -PDMA 60 - b -PS 120 .
[0043] Will PEO 43 - b -PDMA 60 - b -PS 120 The triblock polymer was dissolved in dimethylformamide (DMF) at a concentration of 10 mg / mL, and absolute ethanol was added dropwise for self-assembly. The concentration of polymer nanoparticles obtained af...
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