Preparation method of hydroxyl-terminated aqueous core shell emulsion for anticorrosive paint
A core-shell emulsion and anti-corrosion coating technology, applied in anti-corrosion coatings, coatings, etc., can solve the problems of weak mechanical properties, medium resistance, and insufficient separation degree, and achieve high peel strength, increased solid content, and strong adhesion Effect
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Embodiment 1
[0051] 1) Preparation of double bond-terminated linear polyurethane emulsion
[0052] Put 100 parts of PPG (molecular weight: 2000) into a three-neck flask, vacuum dehydrate at 100°C for 2 hours; cool down to 78°C, add 4.7 parts of NPG and 59.3 parts of IPDI, and keep it warm at 80°C for 3 hours; add DMPA after the reaction solution cools down to 75°C 9.86 parts and 10 parts of co-solvent acetone, keep warm at 78℃ for 0.5-1h, add 0.1 part of DBTDL, continue to react for 1.5-2h; cool down to 60℃, add 12.14 parts of HPMA, keep warm for 1.5h; after the reaction, cool down to 40℃ Add 25 parts of MMA for viscosity reduction, then add 7.4 parts of TEA and stir for 5 minutes, then add 370 parts of deionized water under high-speed stirring to disperse into an emulsion. After 10-15 minutes, slowly add 1.74 parts of hydrazine hydrate, 0.87 parts of ethylenediamine and deionized The mixture of 10 parts of water is chain-extended, and matured at 50°C for 1 hour to obtain a double-bond-ter...
Embodiment 2
[0058] 1) Preparation of double bond-terminated linear polyurethane
[0059] Put 100 parts of PTMG (molecular weight 2000) into a three-necked flask, dehydrate in vacuum at 100°C for 2 hours; cool down to 75°C, add 4.7 parts of NPG and 46.3 parts of TDI, and keep warm at 80°C for 3 hours; after the reaction solution cools to 75°C, add DMPA 9.86 10 parts of acetone and 10 parts of acetone, 78 ℃ heat preservation reaction 0.5-1h, add DBTDL 0.1 part, continue to react for 1.5-2h; after cooling down to 60 ℃, add 12.14 parts of HPMA, heat preservation reaction 1.5h; after the reaction, cool down to 40 ℃ and add 25 parts of MMA for viscosity reduction, then add 7.4 parts of TEA and stir for 5 minutes, then add 370 parts of deionized water under high-speed stirring to disperse into an emulsion, and slowly add 4 parts of ADH, 0.87 parts of ethylenediamine and 10 parts of deionized water after 10-15 minutes part of the mixture for chain extension, and aging at 50°C for 1 hour to obtain...
Embodiment 3
[0065] 1) Preparation of double bond-terminated linear polyurethane
[0066] Put 100 parts of PCL (molecular weight: 2000) into a three-necked flask, dehydrate under vacuum at 100°C for 2 hours; cool down to 80°C, add 4.7 parts of NPG and 59.1 parts of IPDI, and keep warm at 80°C for 3 hours; after cooling down to 75°C, add 9.86 parts of DMPA and auxiliary 10 parts of solvent acetone, 78 ℃ heat preservation reaction for 0.5-1h, dropwise add 0.15 parts of DBTDL to continue the reaction for 1.5-2h; after cooling down to 60 ℃, add 12 parts of HPMA, heat preservation reaction for 1.5h; After 10-15 minutes, slowly add 1.74 parts of hydrazine hydrate, 0.87 parts of ethylenediamine and 20 parts of deionized water to expand the mixture. chain, cured at 50°C for 1 hour to obtain a double-bond-terminated linear polyurethane emulsion.
[0067] 2) Preparation of core layer polyurethane modified acrylate composite emulsion
[0068] Add 4 parts of SDS, 4 parts of Pingpingjia, 35 parts of ...
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