A kind of multi-component coating starch and its production process

Abstract

The invention discloses a multielement coating starch. In the multielement coating starch, the dry-basis content is 50%, the viscosity is 200-500cp, the water content in a finished product is less than or equal to 14.0%, the pH value is 6.0-8.0, the substitution degree is 0.035-0.060, the carboxyl accounts for 1.0-2.0% and the acetyl accounts for 1.0-2.0%. The multielement coating starch comprises the following components of: native starch, sodium hypochlorite, a cationic etherifying agent, anhydrous sodium sulphate, acetic anhydride, hydrochloric acid, enzymes, tap water and a proper amount of sodium hydroxide, wherein the sodium hypochlorite accounts for 3.0-4.0% of the mass of the dry basis in the native starch; the cationic etherifying agent accounts for 5.0-8.0% of the mass of the dry basis in the native starch; the acetic anhydride accounts for 4.0-6.0% of the mass of the dry basis in the native starch; the anhydrous sodium sulphate accounts for 3.0-6.0% of the mass of the dry basis in the native starch; and the hydrochloric acid accounts for 1.0-3.0% of the mass of the dry basis in the native starch. The multielement coating starch disclosed by the invention has the advantages that many types of functional groups are adopted, the content of the functional groups is high, the environment-friendly effect is achieved, and petroleum base can be substituted to synthesize latex. Simultaneously, the invention also discloses a production process of the multielement coating starch. The production process is characterized by comprising the five steps of oxidation, esterification, etherification, enzymatic degradation and finished-product preparation.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a multi-component coated starch and a production process thereof. Background technique [0002] The synthetic latex components used in coated paper coatings come from petrochemicals, and petroleum is a non-renewable resource. In order to get rid of this resource limitation and reduce costs even more, many coated paper manufacturers and scientific researchers have started to develop new starch-based products. Coating starch was developed under this background. As a coating adhesive, it is different from petroleum-based synthetic latex. It is derived from renewable resources and does not contain volatile organic compounds. It is an environmentally friendly product. Yet coated starch and its production process have the following disadvantages in the prior art: (1) coated starch is generally unit or binary, and the technological process of coated starch is comparat...

AI Technical Summary

Problems solved by technology

Yet coated starch and its production process have the following disadvantages in the prior art: (1) coated starch is generally unit or binary, and the technological process of coated starch is comparatively simple (adopts single process or double process), and reaction makes The quality of coated starch is deviated, the type and quantity of functional groups introduced are small, the starch paste solution ages quickly, and the rheology is poor, resulting in poor water retention of the coating and uneven coating layer of the paper; (2) The cooking concentration of starch is low ( Generally 30-35%), which affects the concentration of the coating, resulting in high energy consumption for paper drying; (3) starch uses deep viscosity reduction, and the yield is low (generally 93-96%)

The above reasons cause the high cost and high price of coating starch; high energy consumption for coating and drying

In turn, the production cost of downstream customers is high, and the enterprise lacks competitiveness.