Preparation method of chalcone-terminated photosensitive waterborne polyurethane/epoxy acrylate
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A technology of epoxy acrylate and waterborne polyurethane, applied in polyurea/polyurethane coatings, epoxy resin coatings, climate sustainability, etc.
Active Publication Date: 2022-05-31
FUYANG NORMAL UNIVERSITY
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Chalcones have photosensitive groups, and there are currently no articles reporting the introduction of chalcones into polyurethane
Method used
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[0035] According to a preferred embodiment of the present invention, the raw material further includes a water-based chain extender, and the water-based chain extender is a substance that introduces an ionic group or a group that can be ionized when the prepolymer performs chain extension.
[0036] The water-based chain extender is selected from one or more of sulfonate type chain extenders, preferably selected from dimethylol propionic acid, dimethylol butyric acid, dimethylolvaleric acid and dimethylol One or more of hexanoic acid, more preferably dimethylolpropionic acid with a hydrophilic carboxyl group.
[0037] Based on 30 parts by weight of polyisocyanate, the amount of the aqueous chain extender is 4-8 parts by weight, preferably 4.5-7 parts by weight, more preferably 5-6 parts by weight.
[0038] The raw material also includes a neutralizing agent, and the neutralizing agent is selected from one or more of organic bases, preferably selected from diethanolamine, trieth...
Embodiment 1
[0107] Under nitrogen protection, add 30g of isophorone diisocyanate (IPDI), 56g of polytetrahydrofuran ether glycol (PTMG-1000), 5.6g of dimethylolpropionic acid (DMPA) into the container, and heat up to 80°C , add 0.17g dibutyltin dilaurate (DBTDL), react for 3.5h, obtain isocyanate-terminated polyurethane;
[0108] Add 25g of 4-beta-hydroxyethyloxychalcone (HEOC) at a temperature of 80°C and react for 5h to obtain a chalcone-terminated aqueous polyurethane;
[0109] Cool down to 40°C, add 5g TEA, react for 20min-30min; then cool down to 25°C-30°C, add deionized water to control the solid content to 40wt.%, and stir at high speed for 1h at a stirring speed of 800r / min to obtain Char Ketone-terminated aqueous polyurethane emulsion PTMG-CWPU.
Embodiment 2
[0111] Prepare in a manner similar to Example 1, except that the soft segment is 56 g of polyethylene glycol (PEG-1000), and the other steps are the same to obtain a chalcone-terminated aqueous polyurethane emulsion PEG-CWPU.
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Abstract
The invention provides chalcone-terminated photosensitive waterborne polyurethane, a preparation method thereof and a waterborne polyurethane/epoxy acrylate cured film prepared from the chalcone-terminated photosensitive waterborne polyurethane, the photosensitive waterborne polyurethane is prepared from raw materials including polyisocyanate, oligomer polyol and chalcone, the polyurethane is subjected to end capping treatment through the chalcone, and the curing effect of the chalcone is improved. A photosensitive group is added into polyurethane through a covalent bond, so that the polyurethane is endowed with excellent photocuring performance, has photosensitivity under the irradiation of ultraviolet light and visible light, can be cured under the condition that a photoinitiator does not need to be added, and meanwhile, has good photocuring performance. A waterborne polyurethane/epoxy acrylate cured film prepared by taking the photosensitive waterborne polyurethane as a raw material is good in thermal stability, high in adhesive force and impact strength and good in application prospect.
Description
technical field [0001] The invention relates to the technical field of photocurable materials, in particular to a chalcone-terminated photosensitive waterborne polyurethane / epoxy acrylate and a preparation method thereof, and a method for preparing a cured film of the waterborne polyurethane acrylate. Background technique [0002] Polyurethane (PU) is a high molecular polymer containing repeating urethane (-NHCOO-) units. The performance of PU is mainly composed of soft segment and hard segment structure. The hard segment is generally composed of isocyanate, which affects the physical properties of the material; the soft segment is generally composed of oligomeric polyols, which affects the flexibility and low-temperature performance of the material. PU is widely used in wood floor paint, paper paint, architectural paint, leather paint and many other fields. PU is divided into solvent-based polyurethane and water-based polyurethane. Solvent-based polyurethane is added with...
Claims
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