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Preparation method of low discoloration dextrin glue for painting pigment
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A non-toxic dextrin and pigment technology, applied in the field of preparation of low-color-changing dextrin glue for painting pigments, can solve the problems of slow discoloration and affecting product use, and achieve the effects of reducing dosage, inhibiting glue discoloration, and reducing whiteness decline
Inactive Publication Date: 2019-02-01
NANCHANG LANPO PEN & PAINTING MATERIALS CO LTD
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Although the dextrin used in this field has a higher whiteness, the glue configured with it will slowly change color (browning reaction) when placed, resulting in obvious color difference when placed as a raw material for painting pigments, affect the use of the product
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[0021] A method for preparing dextrin glue with low discoloration for painting pigments, the method comprising the following steps: stirring cornstarch, deionized water, and solid acid evenly, transferring to a frying pan, stirring, cooling down, and sieving to obtain dextrin powder, and separate and recover solid acid; add dextrin powder to polyol, polyamide and deionized water, and cool naturally to obtain the finished product of dextrin glue.
[0022] The specific step of stir-frying is to transfer to a frying pan, raise the temperature to 70° C.-110° C. within 0.1-1.5 hours, and stir-fry for 0.1-3 hours.
[0023] The specific parameters of the heating and stirring are heating to 30-55° C. and stirring for 0.1-1 hour.
[0024] The mass ratio of the uniformly stirred cornstarch, deionized water and solid acid is 100:2-15:0.01-3.
[0025] The mass ratio of the heated and stirred dextrin powder, deionized water, polyol and polyamide is 100:100-800:0.1-15:0.1-5.
[0026] The ...
Embodiment 1
[0040] Get 10kg deionized water, add 250g 300 mesh ZrO to it 2 Load sulfuric acid, mix well, then spray on 200kg cornstarch, stir well. Transfer to a frying pan, heat up to 105°C in 1.5 hours, keep the temperature constant for 4 hours, discharge, cool down, and sieve through a 200-mesh sieve to obtain dextrin powder. Transfer 200kg of dextrin powder to a glue maker, add 400kg of deionized water, 30kg of glycerin, and 1.5kg of polyamide, stir evenly at 50°C, cool naturally, and pack to obtain dextrin glue.
Embodiment 2
[0042] Take 15kg deionized, add 200g 300 mesh ZrO to it 2 Load sulfuric acid, mix well, then spray on 350kg cornstarch, stir well. Transfer to a frying pan, heat up to 105°C in 1.5 hours, keep the temperature for 3 hours, discharge, cool down, and sieve through a 200-mesh sieve to obtain dextrin powder. Transfer 300kg of dextrin powder to a glue maker, add 600kg of water, 60kg of glycerin, and 3kg of polyamide, stir evenly at 45°C, cool naturally, and pack to obtain dextrin glue.
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Abstract
The invention discloses a preparation method of a low discoloration dextrin glue for painting pigment. The method comprises the following steps of: uniformly stirring corn starch, deionized water andsolid acid, transferring the materials to a wok for stir frying, cooling the materials, sieving the materials to obtain dextrinpowder, and separating the materials and recovering solid acid; adding the dextrinpowder to the polyol, the polyamide and the deionized water, and naturally cooling the materials to obtain the dextrin glue finished product. The preparation method of the low discolorationdextrin glue for the painting pigment uses the solid acid instead of the traditional hydrochloric acid as a catalyst to reduce the amount of the catalyst and the frying temperature when the dextrin is dried by a dry heat method, and reduces the whiteness decrease of the dextrin caused by the frying temperature; and on the other hand, the introduction of polyamide in the glue configuration inhibits the discoloration of the glue.
Description
technical field [0001] The invention relates to the field of preparation of painting supplies, in particular to a preparation method of low-color-changing dextrin glue for painting pigments. Background technique [0002] Starch is an important class of high-molecular carbohydrates, and the products of starch degraded by physical, chemical or enzymatic methods are collectively called dextrins. From the technical point of view, the dry heat process has the advantages of simple process, short reaction time, high efficiency, simple equipment, low cost, and less environmental pollution. It is currently the main method for dextrin production. The product obtained by using dry heat to degrade starch is called pyrolytic dextrin, which has three types: white dextrin, yellow dextrin and British gum. The production conditions and properties are as follows, among which hydrochloric acid has the best catalytic effect (Changchun University of Technology Journal of the Chinese Academy of ...
Claims
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Application Information
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