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Preparation method of dewaxed and decolorized shellac

A kind of shellac and decolorization technology, applied in the field of preparation of dewaxed and decolorized shellac, can solve the problems of not meeting market requirements, poor decolorization effect, etc., and achieve the effects of reducing filtration time, reducing energy consumption, and improving stability

Active Publication Date: 2015-06-10
MOJIANG SENYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is a problem that the decolorizing adsorbent used is only activated carbon, and the decolorization effect on the darker domestic shellac is poor, which cannot meet the requirements of the market

Method used

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  • Preparation method of dewaxed and decolorized shellac
  • Preparation method of dewaxed and decolorized shellac

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 100g granular shellac (color is purple, color index ≤ 18) mixed with 300g 95% ethanol, then fully stir at room temperature to form a shellac ethanol solution with a mass ratio of 1:3, put the shellac ethanol solution at room temperature Stand still for 24 hours to fully precipitate the shellac wax and impurities, separate the upper clarified liquid (about 2 / 3 of the total volume of the solution), and centrifugal filter the lower layer (about 1 / 3 of the total volume of the solution). The clear liquid obtained was combined with the supernatant liquid, and the combined shellac ethanol solution was cooled to 10° C., filtered under reduced pressure to obtain dewaxed shellac ethanol solution; 20 g of activated carbon (commercially available industrial product) was added to the shellac ethanol solution , stirring at 70°C for 45 minutes for decolorization, after the decolorization is completed, filter under reduced pressure while hot to obtain the first decolorization g...

Embodiment 2

[0027]Take 100g granular shellac (color is purple, color index ≤ 18) mixed with 400g 95% ethanol, and then fully stirred at room temperature to form a shellac ethanol solution with a mass ratio of 1:4, and the shellac ethanol solution at room temperature Stand still for 24 hours to fully precipitate the shellac wax and impurities, separate the upper clarified liquid (about 2 / 3 of the total volume of the solution), and centrifugal filter the lower layer (about 1 / 3 of the total volume of the solution). The clear liquid obtained was combined with the supernatant liquid, and the combined shellac ethanol solution was cooled to 10° C., filtered under reduced pressure to obtain dewaxed shellac ethanol solution; 20 g of activated carbon (commercially available industrial product) was added to the shellac ethanol solution , decolorized at 70°C for 45 minutes with constant temperature stirring, and filtered under reduced pressure while hot to obtain the first decolorized glue; add 10g of...

Embodiment 3

[0029] Take 100g granular shellac (color is purple, color index ≤ 18) mixed with 300g 95% ethanol, then fully stir at room temperature to form a shellac ethanol solution with a mass ratio of 1:3, put the shellac ethanol solution at room temperature Stand still for 24 hours to fully precipitate the shellac wax and impurities, separate the upper clarified liquid (about 2 / 3 of the total volume of the solution), and centrifugal filter the lower layer (about 1 / 3 of the total volume of the solution). The clear liquid obtained is combined with the supernatant liquid, and the combined shellac ethanol solution is cooled to 10° C., filtered under reduced pressure to obtain dewaxed shellac ethanol solution; add 15 g of activated carbon (commercially available industrial product) to the shellac ethanol solution , decolorized at 70°C for 45 minutes with constant temperature stirring, and filtered under reduced pressure while hot to obtain the first decolorized glue; add 7.5g activated c...

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Abstract

The invention relates to a production method of natural resin, and particularly relates to a preparation method of dewaxed and decolorized shellac. The preparation method comprises the following steps: by taking shellac particles as a raw material, adding a 95% ethanol solvent to the shellac particles to obtain a shellac ethanol solution; fully precipitating shellac wax and impurities in the shellac ethanol solution, separating supernatant which accounts for two thirds of the total volume of the solution, performing centrifugal filtration of sediment which accounts for one third of the total volume of the solution to obtain clear liquid, and mixing the clear liquid and the supernatant, wherein the wax content of shellac in the supernatant is less than 0.5%; cooling the shellac ethanol solution obtained by mixing the clear liquid and the supernatant to 10DEG C, performing filtration under reduced pressure to obtain a dewaxed shellac ethanol solution in which the shellac contains less than 0.2% of wax, and performing decolorization of the dewaxed shellac ethanol solution thrice to obtain a dewaxed and decolorized shellac sheet. The method provided by the invention is simple to operate, moderate in decolorization condition and high in product quality and can be used for large-scale production of dewaxed and decolorized shellac.

Description

technical field [0001] The invention relates to a production method of natural resin, in particular to a preparation method of dewaxed decolorized shellac. Background technique [0002] Lac is a kind of purple-red natural resin secreted from the insect body by a small Homoptera: Kerridae insect that parasitizes on the host plant and sucks the sap. It is mainly composed of lac resin (65 ~80%), lac pigment (1~3%) and lac wax (5~6%). [0003] There are two kinds of pigments in lac. The red pigment soluble in water is called lac acid, which is an anthraquinone compound. Lac acid itself is red or pink. This part of the pigment is washed in the processed granules. Most of them are washed out in the process. The water-insoluble pigment is called red lacin, which is soluble in organic solvents such as methanol, ethanol, ether, benzene, and toluene. Red lacin is the main reason for the orange-yellow and dark brown color of lacquer tape. This pigment can only be removed by bleachin...

Claims

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Application Information

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IPC IPC(8): C09F1/02
Inventor 卯武彬陈虹锦
Owner MOJIANG SENYUAN TECH
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