A kind of preparation method of modified island-in-the-sea superfine fiber synthetic leather base cloth
A microfiber, sea-island technology, applied in fiber processing, textiles and papermaking, etc., can solve the problems of poor moisture absorption and moisture permeability of sea-island ultrafine fibers, and achieve poor moisture absorption and moisture permeability, no environmental pollution, and moisture absorption. The effect of enhanced moisture permeability
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[0031] 1) Preparation of vinyl collagen
[0032] The dosage of collagen and phosphate buffer solution is 1:8-1:12 (w / v), placed at 70°C±2°C and stirred for 0.5-1h. Among them, the pH of the phosphate buffer solution is 7.4, the main purpose is to fully dissolve the collagen and provide a relatively stable pH environment.
[0033] Methacrylic anhydride can react with primary amino-NH in lysine residues in collagen under heating conditions 2 A reaction takes place to form an amide bond, allowing the C=C in methacrylic anhydride to be incorporated into the collagen structure. During the reaction process, the phosphate buffer solution is mainly used to dissolve collagen and provide a relatively mild reaction environment. The amount of methacrylic anhydride is directly related to the number of C=C double bonds after grafting. If the amount of methacrylic anhydride is too small, the number of C=C double bonds grafted on the surface of collagen will be small, and will not Collagen...
Embodiment 1
[0042]Step 1. Weigh collagen (weight average molecular mass: 181266) and place it in phosphate buffer solution, and stir it for 0.5-1 hour at 70°C±2°C to fully dissolve it to obtain a collagen solution; Under the condition of water bath, add methacrylic anhydride dropwise to the collagen solution, the mass volume ratio of methacrylic anhydride to collagen is 0.1:5 (mL / g), react for 2 hours, and dialyze the collagen to obtain the degree of substitution 15% vinyl collagen (CMA) solution.
[0043] Step 2, weigh the photoinitiator and add it to the vinyl collagen solution obtained in step 1, ultrasonically shake at 40°C for 30 minutes, mix evenly, and set aside; among them, the photoinitiator The concentration is 0.005%.
[0044] Step 3: Cut the ultrafine fiber synthetic leather base cloth (USFSLB) into a size of 17cm×13cm, put it into 70°C water and wash it, wash away the impurities and dirt in the USFSLB, and dry it in the air. Then immerse the washed USFSLB into step 2 conta...
Embodiment 2
[0046] Step 1. Weigh collagen (weight average molecular mass: 181266) and place it in phosphate buffer solution, and stir it for 0.5-1 hour at 70°C±2°C to fully dissolve it to obtain a collagen solution; Under the condition of water bath, add methacrylic anhydride dropwise to the collagen solution, the mass volume ratio of methacrylic anhydride to collagen is 1.2:5 (mL / g), react for 2 hours, and dialyze the collagen to obtain the degree of substitution 73% vinyl collagen (CMA) solution.
[0047] Step 2, weigh the photoinitiator and add it to the vinyl collagen solution obtained in step 1, ultrasonically shake at 40°C for 30 minutes, mix evenly, and set aside; among them, the photoinitiator The concentration is 0.006%.
[0048] Step 3: Cut the ultrafine fiber synthetic leather base cloth (USFSLB) into a size of 17cm×13cm, put it into 70°C water and wash it, wash away the impurities and dirt in the USFSLB, and dry it in the air. Then immerse the washed USFSLB into step 2 cont...
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