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Method for refining lac red coloring matter

A technology of lac red pigment and refining method, which is applied in the direction of chemical instruments and methods, azo dyes, organic dyes, etc., can solve problems such as environmental pollution, shorten the process, etc., achieve improved safety, obvious refining effect, and eliminate pollution Effect

Inactive Publication Date: 2011-05-11
THE RES INST OF RESOURCES INSECTS RIRI OF THE CHINESE ACADEMY OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a refining method for lac red pigment in view of the problems existing in the prior art. -Food additive lac red pigment [GB / T 4571-1996], which shortens the refining process of lac red pigment, improves the yield and purity of lac red pigment, reduces production energy consumption, and comprehensively utilizes resources , fundamentally solve the environmental pollution problem of shellac industrial production

Method used

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  • Method for refining lac red coloring matter

Examples

Experimental program
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Effect test

Embodiment 1

[0044] 1. Crush the raw rubber into granules with a particle size of 4-6 mm, and remove resin, sand and other impurities through a circular pendulum sieve;

[0045] 2. Add the pulverized raw rubber particles into the rubber washing tank equipped with industrial tap water with a pH value between 7 and 8, and control the glue-liquid ratio (that is, the weight ratio of the pulverized raw rubber to the aqueous solution) to be 1:5. Soak for 4 hours to collect the washing liquid; repeat three times, and combine the washing liquid;

[0046] 3. Add the gel washing solution into the clarification tank to settle, separate the sediment and particle shellac, and the settling time is 12 hours;

[0047] 4. Carry out two-stage filtration to the clarified washing liquid, the filter screen of the first-stage filter is 200 mesh stainless steel wire mesh, and the filter screen of the second-stage filter is 400 mesh stainless steel wire mesh;

[0048] 5. Regulate the acid value of the filtrate wit...

Embodiment 2

[0055] 1. Crush the raw rubber into granules with a particle size of 1-4 mm, and remove resin, sand and other impurities through a vibrating screen;

[0056] 2. Put the crushed raw rubber particles into the rubber washing tank equipped with industrial tap water with a pH value between 7 and 8, control the glue liquid ratio to 1:8, soak for 12 hours to collect the washing liquid; repeat three times, and combine the washing gels liquid;

[0057] 3. Add the gel washing solution into the clarification tank to settle, separate the sediment and particle shellac, and the clarification time is 24 hours;

[0058] 4. Carry out two-stage filtration to the clarified washing liquid, the filter screen of the first-stage filter is 200 mesh stainless steel wire mesh, and the filter screen of the second-stage filter is 400 mesh stainless steel wire mesh;

[0059] 5. Use a phytic acid solution with a weight concentration of 3% to adjust the acid value of the filtrate, and control the pH of the...

Embodiment 3

[0064] 1. Crush the raw rubber into granules with a particle size of 7-10 mm, and remove resin, sand and other impurities through a circular pendulum sieve;

[0065] 2. Put the crushed raw rubber particles into the washing tank with industrial tap water with a pH value between 7 and 8, control the glue-to-liquid ratio to 1:3, soak for 2 hours to collect the washing liquid; repeat three times, and combine the washing gels liquid;

[0066] 3. Put the washing liquid into the clarification tank to settle, separate the sediment and particle shellac, and the clarification time is 2 hours;

[0067] 4. Carry out two-stage filtration to the clarified washing liquid, the filter screen of the first-stage filter is 200 mesh stainless steel wire mesh, and the filter screen of the second-stage filter is 400 mesh stainless steel wire mesh;

[0068] 5. Adjust the acid value of the filtrate by using an acetic acid solution with a weight concentration of 5%, and control the pH of the filtrate ...

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Abstract

The invention relates to a process for extracting from virgin rubber purple twig and refining lac dye, which comprises immersing the virgin rubber with water, extracting rubber washing liquid, and filtering the rubber washing liquid through microfiltration and hyperfiltration. The process of the invention has simple technique and convenient operation, the appearance color and physicochemical index of the refined lac dye achieve the standard of the national standards of P.R.C- food additive lac dye(GB / T4571-1996), wherein the contents of heavy metal such as plumbum, arsenic and the like greatly lower than the contents which are regulated by the national standard. The invention improves the security for eating of the lac dye, shortens the refining technique of the lac dye, improves the yield rate and pureness of the lac dye, lowers energy consumption of production, utilizes a film refining method to refine the lac dye, avoids adding a large amount of acid and alkalic, and keeps the original chemical structure of the lac dye, and then the environmental pollution problem of the industrial production of lac is substantially solved.

Description

technical field [0001] The invention relates to a method for preparing natural-sourced pigment from natural raw materials, in particular to a preparation method for lac red pigment. Background technique [0002] Lac red pigment, one of the most widely used natural pigments, is an extract derived from animals. People's utilization of lac red pigment was earlier than that of lac resin. Lac red pigment is traditionally used in food, medicine, cosmetics, printing and dyeing and textile industries. Its color itself is red or pink, but it is formulated through mordant dyeing. Other shades available. [0003] In recent years, with the development of medical toxicology and biological experiments, people have realized that some synthetic food colorings have certain toxicity to the human body, and some have carcinogenic effects. Therefore, natural coloring has gained widespread attention and application again. . Lac red pigment is water-soluble and non-toxic, and has been widely us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B61/00B01D61/14
Inventor 张弘郑华陈军陈智勇陈晓鸣石雷唐莉瑛
Owner THE RES INST OF RESOURCES INSECTS RIRI OF THE CHINESE ACADEMY OF FORESTRY