High-water-absorption napkin and preparation method thereof
A napkin, high water absorption technology, applied in the field of high water absorption napkin and its preparation, can solve the problems of weak water absorption and fragility, and achieve the effect of excellent flexibility and strength
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Embodiment 1
[0023] Preparation of modified cationic polyacrylamide:
[0024] A1. After mixing 0.5g emulsifier and 40g deionized water evenly, under stirring, add 30g silica sol and stir evenly, adjust the pH value of the solution to 8.5 with hydrochloric acid with a mass fraction of 10%, and then dropwise add 1g KH- 570, after the addition is complete, stir at room temperature for 12 hours to obtain a modified silica sol emulsion, the emulsifier is nonylphenol polyoxyethylene ether, the silica sol is alkaline silica sol, the pH is 9-9.5, and the mass fraction of silica 30%;
[0025] A2. Under nitrogen atmosphere, after heating to 78°C, add 40g of acrylamide, 5g of dimethyl diallyl ammonium chloride and 20g of allyl glycidyl ether dropwise to 13g of the modified silica sol emulsion prepared in step A1 The mixture of two thirds of the initiator solution was added dropwise synchronously (the initiator solution was made by mixing 0.8g ammonium persulfate and 8g deionized water), the rate of ...
Embodiment 2
[0027] Preparation of modified cationic polyacrylamide:
[0028] A1. After mixing 1g emulsifier and 50g deionized water evenly, under stirring, add 35g silica sol and stir evenly, adjust the pH value of the solution to 8.5 with 10% hydrochloric acid, and then add 2g KH-570 dropwise After the dropwise addition is complete, stir at room temperature for 12 hours to obtain a modified silica sol emulsion, the emulsifier is nonylphenol polyoxyethylene ether, the silica sol is alkaline silica sol, the pH is 9-9.5, and the mass fraction of silica is 35%;
[0029] A2. Under a nitrogen atmosphere, after heating to 78°C, add 65g of acrylamide, 15g of dimethyl diallyl ammonium chloride and 40g of allyl glycidyl ether dropwise to 21g of the modified silica sol emulsion prepared in step A1 The mixture, synchronously drop two-thirds of the initiator solution (the initiator solution is made by mixing 2g ammonium persulfate and 20g deionized water), the rate of addition is 3 drops / second, and...
Embodiment 3
[0031] A preparation method of superabsorbent napkin, comprising the following steps:
[0032]Step 1. Preparation of mixed pulp: 70g of raw pulp, 0.1g of cationic starch and 0.5g of trialkyl phosphate were decomposed for 20,000 rpm with a fiber dissociator to obtain mixed pulp, wherein the raw pulp contained the following raw materials in weight percentage: 8% Straw pulp, 70% wood pulp, and the balance wood pulp;
[0033] Step 2, copying: add 0.4g of the modified cationic polyacrylamide prepared in Example 1 and 7g of silica sol to 100g of mixed pulp, beat the pulp at 2000 rpm for 8min, and copy it into a quantitative 20g / m 2 Paper sheets, then pressed with a press for 5 minutes to obtain wet paper;
[0034] Step 3. Drying: Dry the wet paper with a drum dryer, wrinkle it with a scraper, and curl it into a roll to obtain a high-absorbent napkin.
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