Aqueous composition containing at least one soluble gelatinized anionic starch
A technology of anionic starch and water-based composition, which is applied in the field of manufacturing paper or flat plates, and can solve problems such as unsatisfactory solutions
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example 1
[0110] This example describes the preparation of an anionic starch composition according to the prior art.
[0111] A colloidal solution of gelatinized anionic starchy material (succinylated potato starch with a degree of substitution (DS) of 0.07) obtained by conventional methods described in the literature was dissolved at a concentration of 9% dry matter (DM) in the water. The resulting aqueous composition had a Brookfield viscosity of 8000 mPa.s measured at 25°C and 20 rpm. The viscosity changes very rapidly. After 48 hours of storage it can no longer be measured.
[0112] Prepared as a milk with 17% DM, it was supplied to a continuous reactor which also received 0.6% by volume of an alpha-amylase (Fungamyl 800L-Novozymes ). The temperature of this gelation step was 60°C and the average residence time was 20 minutes.
[0113] The enzyme was inhibited (thermally deactivated) by passing it through a jet cooker at 130°C.
[0114] The resulting aqueous starch solution ha...
example 2
[0116] The above process was repeated except that after inhibiting the enzyme by heating at a temperature of 130°C, the resulting aqueous solution was passed through a heat exchanger to cool the colloidal solution to a temperature below 35°C as rapidly as possible.
[0117] The implementation of this efficient and rapid supplementary cooling step makes it possible (all other respects the reaction conditions being equal) to produce much higher reaction yields. Specifically, the resulting product had a charge density of -420 μeq / g dry matter, ie more than three (3) times higher ionic charge than the anionic starch prepared in Example 1 . Its DS is 0.063 (x 2.7).
[0118] The novel method including a rapid cooling step performed significantly better.
example 3
[0120] Here, the effect is illustrated by a second anionization reaction with a substitution reactant identical to that from the first step, in a matrix starch first converted under the conditions of the prior art (in this case on the product obtained in Example 1).
[0121] The necessary amount of colloidal solution obtained in Example 1 was transferred to a reactor equipped with a pH control loop. The redox medium is adjusted to neutrality, the pH is then adjusted to 8.5 using a 3.5% strength sodium hydroxide solution, and the reaction medium is kept under pH control.
[0122] 5% of succinic anhydride by dry weight relative to the dry starch was added over one hour under pH control of 8.5. At the end of the addition, the reaction was left for 30 minutes before being neutralized to pH 6.
[0123] The product obtained had a charge density of -495 μeq / g dry matter and a DS of 0.08.
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