Modified sizing starch, surface sizing liquid and preparation method and application thereof
A technology for sizing starch and surface sizing, which is applied in textiles and papermaking, recycling technology, addition of water repellents, etc., can solve the problems of high preparation cost and complicated preparation process of surface sizing liquid, and improve water resistance. , Good system stability, the effect of saving workshop costs
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Embodiment 1
[0065] 1. Preparation of modified sizing starch
[0066] (1) be 4.8~5.2 at pH, temperature is 50 ℃, and under the condition of stirring, drop into the glass reaction vessel that 280g solid content is the prehydrolyzate of 27%, 6.3g mass percent is the sodium hydroxide aqueous solution of 32% , 25g tapioca starch, mix uniformly, make material A;
[0067] (2) At a temperature of 50°C, add 0.08g of ferrous sulfide and 2.5g of 28% hydrogen peroxide aqueous solution to material A, mix, continue to heat up, and keep warm at 75-78°C Stir for 2h to obtain material B;
[0068] (3) The material B, 0.8 g of sodium nitrite and 21.8 g of deionized water were mixed, cooled to room temperature, and discharged to obtain a modified surface-sized starch with a solid content of 30%.
[0069] 2. Preparation of surface sizing solution
[0070] Mix the prepared modified sizing starch with cornstarch aqueous solution with a solid content of 10% according to the dry mass ratio of 1:1 to obtain a m...
Embodiment 2
[0072] 1. Preparation of modified sizing starch
[0073] (1) be 4.8~5.2 at pH, temperature is 52 ℃, and under the condition of stirring, drop into 210g solid content and be 24% pre-hydrolyzed liquid, 4.8g mass percentage be the sodium hydroxide aqueous solution of 40% in the glass reactor , 19g of cornstarch, mixed evenly, made material A;
[0074] (2) At a temperature of 50°C, add 0.03g of chromium monoxide and 2g of 28% hydrogen peroxide aqueous solution to material A, mix, continue to heat up, and keep stirring under the condition of 78-81°C 1.5h, obtained material B;
[0075] (3) Mix the material B, 0.4 g of potassium iodide and 98 g of deionized water, cool to room temperature, and discharge to obtain a modified surface-sized starch with a solid content of 31%.
[0076] 2. Preparation of surface sizing solution
[0077] Mix the prepared modified sizing starch with cornstarch aqueous solution with a solid content of 10% according to the dry mass ratio of 1:1 to obtain a...
Embodiment 3
[0079] 1. Preparation of modified sizing starch
[0080] (1) be 4.8~5.2 at pH, temperature is 50 ℃, and under the condition of stirring, drop into 160g solid content and be 16% pre-hydrolyzate, 3.2g sodium carbonate, 16g wheat starch in glass reactor, mix uniformly, Material A is obtained;
[0081] (2) At a temperature of 50°C, add 0.02g of vanadium dichloride and 1.8g of a 28% aqueous hydrogen peroxide solution to the material A, mix, and continue to heat up, at 75-78°C Insulated and stirred for 1 hour to obtain material B;
[0082] (3) The material B, 0.3 g of tert-butanol and 109 g of deionized water were mixed, cooled to room temperature, and discharged to obtain a modified surface-sized starch with a solid content of 15%.
[0083] 2. Preparation of surface sizing solution
[0084] Mix the prepared modified sizing starch with cornstarch aqueous solution with a solid content of 10% according to the dry mass ratio of 1:1 to obtain a mixed sizing starch, dilute the mixed s...
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