Sericin modified waterborne polyurethane waterproof moisture-permeable coating and preparation method thereof
A water-based polyurethane and sericin technology, used in textiles and papermaking, can solve the problems of poor water resistance, low water pressure resistance, poor mechanical strength, etc., to improve moisture permeability and water pressure resistance, improve water resistance, and solve problems of poor water resistance Effect
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[0025] figure 1 It is a method flow chart of a preparation method of a sericin-modified waterborne polyurethane waterproof and moisture-permeable coating shown according to an exemplary embodiment. figure 1 Among them, the preparation method of the sericin-modified waterborne polyurethane waterproof and moisture-permeable coating comprises:
[0026] Step 1: After adding 2 to 6 mg of alkaline protease to 10 to 30 parts by weight of a sericin solution with a concentration of 0.1 mg / mL, adjust the pH of the sericin solution to 9 to 9.5, and then add the sericin The protein solution was placed in a 45°C constant temperature shaking culture shaker for 3-6 hours of oscillating enzymolysis, and after the enzymolysis was completed, the pH of the sericin solution was adjusted to be neutral to obtain an enzymolysis sericin solution.
[0027] Step 2: After adding 0.2-0.6 parts by weight of aminopropyltriethoxysilane and 0.2-0.4 parts by weight of acetic acid to 10-30 parts by weight of ...
Embodiment 1
[0043] Enzymatic hydrolysis of sericin:
[0044] After adding 2 mg of alkaline protease to 10 parts by weight of the sericin solution with a concentration of 0.1 mg / mL, adjust the pH of the sericin solution to 9, and then place the sericin solution in a 45° C. Incubate the shaker for 3 hours of enzymatic hydrolysis. After the enzymatic hydrolysis, adjust the pH of the sericin solution to be neutral to obtain an enzymatic sericin solution.
[0045] Synthesis of Sericin Chain Extender:
[0046] After adding 0.2 parts by weight of aminopropyltriethoxysilane and 0.2 parts by weight of acetic acid to 10 parts by weight of the enzymatic sericin solution, react at a reaction temperature of 75°C for 4 hours to prepare a sericin chain extender .
[0047] Synthesis of sericin-modified waterborne polyurethane waterproof and moisture-permeable coatings:
[0048] After blending 40 parts by weight of PTMG-2000 and 30 parts by weight of PPG-1000, 5 parts by weight of ethylene glycol, 50 p...
Embodiment 2
[0050] Enzymatic hydrolysis of sericin:
[0051] After adding 4 mg of alkaline protease to 20 parts by weight of the sericin solution with a concentration of 0.1 mg / mL, adjust the pH of the sericin solution to 9.3, and then put the sericin solution in a constant temperature of 45°C Vibrating and incubating with a shaker for 5 h of enzymatic hydrolysis, adjusting the pH of the sericin solution to neutral after the enzymatic hydrolysis is complete, to obtain an enzymatic sericin solution.
[0052] Synthesis of Sericin Chain Extender:
[0053] After adding 0.4 parts by weight of aminopropyltriethoxysilane and 0.3 parts by weight of acetic acid to 20 parts by weight of the enzymatic sericin solution, react at a reaction temperature of 80° C. for 5 h to prepare sericin chain extension agent.
[0054] Synthesis of sericin-modified waterborne polyurethane waterproof and moisture-permeable coatings:
[0055] After blending 20 parts by weight of PCDL-1000, 40 parts by weight of PCL-...
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