Process for preparing denatured starch size with good stability and high tackability
A technology of modified starch and size, which is applied in the field of preparation of modified starch size with high adhesive force and good stability, to achieve the effect of improving bonding fastness, low fluctuation rate of viscosity of hot slurry, and high adhesive performance
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Embodiment 1
[0021] In a 1000 ml three-necked flask, add 300 g (dry weight) of corn starch refined by methanol-water solution (85:15, volume ratio) and 450 ml of water, heat up to 40°C under stirring, and dilute sulfuric acid The solution adjusts the starch suspension to pH 1.9, then adds 12 ml of 10% formaldehyde solution, reacts at 40°C for 18 hours, and neutralizes to pH 6-7 with 4% sodium carbonate solution. Add 10 ml of 5% sodium bisulfite solution, and continue stirring for 30-60 minutes to remove unreacted residual formaldehyde. It is then filtered, washed well and then dried, crushed and sieved. Get 100 grams (dry weight) and 150 milliliters of water of the obtained cross-linked starch, join in the 500 milliliters there-necked flask, be warming up to 40 ℃ under stirring, and adjust the pH value of this starch suspension with 4% NaOH solution to be 11 -11.5. Get 4 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride, add it to 10 milliliters of water, then gradually add 8 m...
Embodiment 2
[0023]Using the method and steps of Example 1, only the degree of quaternary ammonium etherification of the crosslinked starch was changed. The consumption of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 8 grams, 20 milliliters of water and 16 milliliters of 10% sodium hydroxide solution, after mixing homogeneously, prepare with 100 grams (dry weight) with example 1 method The cross-linked starch undergoes quaternary ammonium etherification reaction. The cross-linking degree of the product is 120 glucose residues / cross-linking bond, and the substitution degree of the hydroxypropyltrimethylammonium chloride atomic group is DS=0.038. The thermal slurry viscosity instability of the product, the adhesion performance to cotton fibers, and the stability of the mixed slurry are shown in Attached Table 1 and Attached Table 1. Figure 1-2 .
Embodiment 3
[0025] Adopt the method and steps of Example 1, but change the degree of cross-linking of starch and the degree of denaturation of quaternary ammonium etherification at the same time. During the cross-linking process, 6 milliliters of 10% formaldehyde solution was used to react with 300 grams of starch, while the quaternary ammonium etherification reaction adopted the parameters of Example 2. The cross-linking degree of the product is 322 glucose residues / cross-linking bond, and the substitution degree of the hydroxypropyltrimethylammonium chloride atomic group is DS=0.04. The thermal slurry viscosity instability of the product, the adhesion performance to cotton fibers, and the stability of the mixed slurry are shown in Attached Table 1 and Attached Table 1. Figure 1-2 .
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