Preparation method of silane coupling agent modified solvent-free waterborne polyurethane
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A technology of water-based polyurethane and silane coupling agent, which is applied in textiles, papermaking, fiber treatment, etc., to achieve superior mechanical properties, large-scale production, and easy control of conditions
Inactive Publication Date: 2021-04-23
明新梅诺卡(江苏)新材料有限公司
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[0004] The technical problem to be solved in the present invention is: research and develop a kind of method that obtains the water-based polyurethane with better mechanical property and heat-resistant performance through the modification of silane coupling agent, the preparation of the solvent-free water-based polyurethane modified by the silane coupling agent The process is completely solvent-free, environmentally friendly and pollution-free, and the preparation process is simple, and the prepared solvent-free water-based polyurethane has the characteristics of superior mechanical properties and good heat resistance
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Embodiment 1
[0047] Step 1: Drying of polyether polyol
[0048] First, 25g of polytetrahydrofuran ether glycol (PTMG2000) and 155g of polyethylene glycol (PEG2000) are added to a 500ml four-necked flask with electric stirring, thermometer, constant pressure funnel and vacuum pump, then turn on the electric stirring for stirring, open the oil bath Heat up the pot, turn on the vacuum pump to evacuate the four-necked flask, start timing when the thermometer on the four-necked flask reaches 105°C and the vacuum pressure is ≤-0.08MPa, keep the temperature at 105°C-110°C, and the pressure ≤-0.08MPa Under the condition of vacuum dehydration for 2h.
[0049] Step 2: Preparation of solvent-free waterborne polyurethane prepolymer
[0050] When the water content in the polyol is less than 0.05%, turn off the vacuum pump, lower the temperature of the oil bath, and when the temperature of the thermometer drops to 75°C, slowly add 50g of isophorone diisocyanate through a constant pressure funnel, stir ...
Embodiment 2
[0056] Step 1: Drying of polyether polyol
[0057] Add 50g of polytetrahydrofuran ether glycol (PTMG2000), 120g of polypropylene glycol (PPG3000) and 12g of polyethylene glycol monomethyl ether (Ymer-N120) into a 500ml four-necked flask with electric stirring, thermometer, constant pressure funnel and vacuum pump , then turn on the electric stirrer to stir, turn on the oil bath to heat up, turn on the vacuum pump to evacuate the four-necked flask, when the thermometer on the four-necked flask reaches 110°C, start timing when the vacuum pressure is ≤-0.08MPa, and keep the temperature at 110 ℃~120℃, vacuum dehydration for 2h under the condition of pressure ≤-0.08MPa.
[0058] Step 2: Preparation of solvent-free waterborne polyurethane prepolymer
[0059] When the water content in the polyol is less than 0.05%, turn off the vacuum pump, lower the temperature of the oil bath, and when the temperature of the thermometer drops to 75°C, slowly add 45g of hexamethylene diisocyanate t...
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Abstract
The invention discloses a preparation method of silane coupling agent modified solvent-free waterborne polyurethane, and the method comprises the following steps of: 1) drying polyol, and controlling the water content in the polyol to be lower than 0.05%; 2) uniformly mixing the polyol dried in the step (1) with isocyanate, performing heating and carrying out reaction, then adding a chain extender, a hydrophilic chain extender and 1 part of a catalyst, and uniformly mixing the substances to obtain a solvent-free waterborne polyurethane prepolymer; 3) adding an alkaline aqueous solution into the solvent-free waterborne polyurethane prepolymer in the step (2), and fully mixing the substances for emulsifying under high-speed stirring to obtain a waterborne polyurethane emulsion; and 4) reacting the solution system obtained in the step (3) with a compound containing two or more amino groups, then adding a silane coupling agent, and dropwise adding a defoaming agent after complete reaction to obtain the silane coupling agent modified solvent-free waterborne polyurethane. The preparation process is simple, and the prepared solvent-free waterborne polyurethane is excellent in mechanical property and good in heat resistance.
Description
technical field [0001] The invention relates to the technical field of polymer synthesis, in particular to a preparation method of a silane coupling agent-modified solvent-free waterborne polyurethane. Background technique [0002] Polyurethane, or polyurethane (PU), is a general term for polymers containing repeated urethane chains (-NHCOO-) in their molecular structure. Water-based polyurethane (WPU) is a high-performance polymer compound that uses water as the dispersion medium, and polyurethane particles are dispersed in it to form a transparent or opaque liquid. It not only retains the excellent properties of solvent-based polyurethane such as wear resistance, low temperature resistance, fatigue resistance, and good flexibility, but also has the advantages of non-toxic, non-flammable, non-polluting, easy to modify, etc., and can be widely used in coatings, adhesives, etc. Agents, automotive paints, fabric coatings, leather finishing agents and other fields. [0003] H...
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