Nano-modified waterborne polyester resin and preparation method thereof
A water-based polyester resin, nano-modification technology, applied in polyester coatings, coatings, etc., can solve problems such as poor stability, and achieve excellent stability and hydrolysis resistance
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[0050] The preparation method of the nano-dispersion in the nano-modified water-based polyester resin of the present invention may further comprise the steps:
[0051] (1) Hydrolysis:
[0052] Put 20-30 parts of deionized water, alkali neutralizer, and 4-7 parts of lower alcohol into a reaction kettle in turn, start stirring; add the remaining deionized water and the remaining lower alcohol into a high-level tank, 300-800r Stir at a speed of 1 / min, slowly add the main element precursor, dopant element precursor and lipophilic donor in sequence, and stir to form a uniform solution; drop the solution in the high-level tank into the reactor at a constant speed, and the dropping time For 2-5 hours, after the dropwise addition is completed, continue to react for 1-5 hours and then raise the temperature to 80-120°C, and after reacting for 2-8 hours, cool down to room temperature;
[0053] (2) Centrifugal separation:
[0054] Lead the liquid in the reactor into a centrifuge and cen...
Embodiment 1
[0061] The polymer solution comprises the following components and mass percentages:
[0062]
[0063] Polymerization process: Add phthalic anhydride, linoleic acid, and pentaerythritol into the reactor, and raise the temperature to 140°C until the materials are completely dissolved. Nitrogen was passed into the reaction kettle, and the temperature was raised to 220°C at a rate of 10°C / h, and moisture was continuously removed through the water separator. Take samples to measure the acid value until the acid value is lower than 12mgKOH / g. Then lower the temperature to 120°C, add ethylene glycol butyl ether and stir to dissolve until uniform.
[0064] The nano-dispersion comprises the following components and parts by weight:
[0065]
[0066]
[0067] Take 26 parts of deionized water and 2 parts of ethanol into the high level tank, then slowly add 28 parts of titanium tetrachloride, 1.2 parts of sodium dihydrogen phosphate and 4.8 parts of dodecyltrimethoxysilane in ...
Embodiment 2
[0071] Preparation of polymer solution:
[0072]
[0073] Polymerization process: add isophthalic acid, trimethylolpropane, and tall oleic acid into the reactor, and raise the temperature to 140°C until the materials are completely dissolved. Nitrogen was passed into the reaction kettle, and the temperature was raised to 220°C at a rate of 10°C / h, and moisture was continuously removed through the water separator. Take samples to measure the acid value until the acid value is lower than 12mgKOH / g. Then lower the temperature to 120°C, add ethylene glycol butyl ether and stir to dissolve until uniform.
[0074] The nano-dispersion comprises the following components and parts by weight:
[0075]
[0076]
[0077] Take 25 parts of deionized water and 3 parts of isopropanol into the high tank, then slowly add 22 parts of titanium tetrachloride, 10 parts of aluminum chloride, 2.5 parts of sodium dihydrogen phosphate and 7 parts of dodecyl trimethoxy Silane, stir evenly, s...
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