Method for preparing printing paste of compound modified starch with adjustable viscosity
A technology for printing paste and modified starch, applied in the field of modified starch, can solve the problems of large viscosity change, difficult to control viscosity, troublesome application, etc., and achieve the effects of convenient preparation, reduced printing cost and short paste wire
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Embodiment 1
[0020] The synthesis of carboxymethyl starch uses starch as a raw material and ethanol as a reaction medium to prepare a starch emulsion with a mass percentage concentration of 30-50%, adding a monochloroacetic acid etherifying agent accounting for 4-10% of the starch mass, and using The pH is adjusted by alkali, the etherification reaction is carried out in the range of pH 8.5-13, the etherification temperature is 40°C, the etherification time is 2 hours, the feeding and reaction are all carried out under stirring, and the reaction product is carboxymethyl starch.
[0021] Cross-linking—synthesis of carboxymethyl starch, using starch as raw material and ethanol as reaction medium to prepare a starch emulsion with a mass percentage concentration of 30-50%, adding sodium trimetaphosphate accounting for 0.3-3% of the starch mass, Add monochloroacetic acid etherification agent accounting for 4-10% of the starch mass, adjust the pH with alkali, and carry out cross-linking-etherific...
Embodiment 2
[0024] The cross-linking agent uses phosphorus oxychloride instead, and all the other conditions are the same as in Example 1.
Embodiment 3
[0026] Carboxymethyl starch: cross-linking-carboxymethyl starch composite mass percentage is 70%: 30%, and other conditions are the same
[0027] Example 1.
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