Oligomer for urethane acrylate vacuum electroplating primer, preparation method of oligomer and vacuum electroplating primer containing oligomer
A polyurethane acrylic and vacuum electroplating technology, which is applied in polyurea/polyurethane coatings, primers, polyester coatings, etc., can solve the problems of high molecular weight, low photoreactivity, and color development of polyurethane acrylate, and achieve good photoreactivity , good flexibility, fast curing effect
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Embodiment 1
[0036] Embodiment 1: the synthesis of aliphatic 2PUA for vacuum plating primer
[0037] 1) Add 222g of isophorone diisocyanate, 0.17g of butyltin dilaurate and 0.1g of p-hydroxyanisole into a 500mL reaction bottle, start stirring, control the temperature in a water bath, weigh 116g of hydroxyethyl acrylate and place it in a constant pressure funnel Start to add dropwise, by controlling the rate of addition, the reaction temperature is controlled at 35 ± 5°C, after the dropwise addition is completed, it is incubated for 100 minutes, and the NCO value is titrated. When NCO≤12.4% (mass content), the reaction ends, and intermediate product A is obtained;
[0038] 2) Weigh 1650g of polyol (Asahikawa Chemical Polyester Diol XCP-3000E) into a 2L reaction flask, add 38.27g of intermediate product A338.27g, 0.17g of butyltin dilaurate and 0.1g of p-hydroxyanisole, at 60°C Heat preservation reaction for 60 minutes, continue to heat up to 80°C, measure NCO content after heat preservation...
Embodiment 2
[0043] Embodiment 2: the synthesis of aromatic 2PUA for vacuum plating primer
[0044]1) Add 174g of toluene diisocyanate, 0.17g of stannous octoate and 0.1g of hydroquinone into a 500mL reaction bottle, start stirring, control the temperature in a water bath, weigh 116g of hydroxyethyl acrylate and place it in a constant pressure funnel to start adding dropwise. By controlling the rate of addition, the reaction temperature is controlled at 35±5°C, and after the addition is completed, the temperature is kept for 100 minutes, and the NCO value is titrated. When NCO≤14.5% (mass content), the reaction ends, and an intermediate product A is obtained;
[0045] 2) Weigh 1500g of polyol (Asahikawa Chemical Polyester Diol XCP-3000E) into a 2L reaction bottle, add 290.27g of intermediate product A, 0.17g of stannous octoate and 0.15g of hydroquinone, and keep warm at 60°C for reaction After 60 minutes, continue to heat up to 80°C, measure the NCO content after 120 minutes of heat prese...
Embodiment 3
[0047] Embodiment 3: the synthesis of aliphatic 2PUA for vacuum plating primer
[0048] 1) Add 168g of hexamethylene diisocyanate, 0.15g of stannous oxalate and 0.1g of 2-tert-butylhydroquinone into a 500mL reaction bottle, start stirring, control the temperature in a water bath, and weigh 130g of hydroxyethyl methacrylate Place in a constant pressure funnel to start dropping, by controlling the dropping speed, the reaction temperature is controlled at 35±5°C, after the dropping is completed, keep warm for 100 minutes, titrate the NCO value, when NCO≤14.8% (mass content), the reaction ends, Obtain intermediate product A;
[0049] 2) Weigh 1500g of polyol (Asahikawa Chemical Polyester Diol XCP-3000B) into a 2L reaction bottle, add 298.25g of intermediate product A, 0.15g of stannous oxalate and 0.15g of 2-tert-butylhydroquinone , 60 DEG C of insulation reaction for 60 minutes, continue to heat up to 80 DEG C, measure the NCO content after insulation reaction for 120 minutes, w...
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