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A kind of bleaching method of lac resin

A shellac resin and shellac technology, applied in the direction of natural resin refining, etc., can solve the problems of environmental product hazards and difficult removal of red shellac, and achieve the effects of convenient operation, high bleaching rate, and high quality

Active Publication Date: 2019-02-12
浙江巅峰实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: it is difficult to remove the water-insoluble red lacin in lac, which causes the lac product to be yellow to brown, seriously affecting the quality of lac product, while the traditional bleaching method of lac is to use sodium hypochlorite Bleaching not only has strong corrosiveness, but also introduces a large amount of combined chlorine in the bleaching process, which will cause harm to the environment and products. A kind of bleaching method of shellac resin is provided. The present invention uses shellac resin successively. Rice washing water, citric acid, and radish soup are used for preliminary bleaching, and then the lac resin is further bleached with soap exposure method and hydrogen peroxide bleaching method, and finally refined bleached lac is obtained. The bleaching process of the present invention is chlorine-free, non-toxic, and non-polluting. The processing efficiency is high, the process is simple, and the operation is convenient. The bleaching agent used not only has a high bleaching rate, but also is green and safe. The shellac resin obtained is of high quality, and the shellac color index is less than 2.0

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First, the shellac resin to be bleached is crushed into particles with a particle size of 5mm and put into a ceramic pot, and then rice washing water is added to the pot until the shellac resin is submerged and exceeds the surface of the resin by 2 cm, and left to soak for 2 days. Change the rice washing water once a day; after soaking, filter and dry to obtain the shellac resin bleached for the first time, then measure 500mL of citric acid and distilled water at a volume ratio of 1:1 to mix the impregnating solution into a glass cup, and pour 50g of the first bleaching Immerse the bleached lac resin in the impregnating solution, place it on a shaker and oscillate and impregnate overnight; filter and separate the lac resin particles with gauze, put them in a ventilated place to dry naturally, and set aside, weigh 200g of white radish and mix it with distilled water 5 times its volume. Pour into an iron pot and heat to boiling for 20 minutes, filter and remove the radish ...

example 2

[0021] First, crush the shellac resin to be bleached into particles with a particle size of 6mm and put it into a ceramic pot, then add rice washing water into the pot until the shellac resin is submerged and exceeds the surface of the resin by 2.5cm, and then soaked for 2.5 days. Replace the rice washing water every other day; after soaking, filter and dry to get the shellac resin bleached for the first time, then measure 550mL of citric acid and distilled water at a volume ratio of 1:1 and pour the impregnating solution into a glass cup, and pour 75g The lac resin after the initial bleaching is immersed in the impregnation solution, placed on a shaker and soaked overnight; the lac resin particles are separated by gauze filtration, placed in a ventilated place to dry naturally, and set aside. Weigh 250g of white radish and mix it with distilled water 6 times its volume , poured into an iron pan, heated to boiling and boiled for 25 minutes, filtered to remove the radish residue...

example 3

[0024]First, crush the shellac resin to be bleached into particles with a particle size of 8 mm and put them in a ceramic pot, then add rice washing water into the pot until the shellac resin is submerged and exceeds the surface of the resin by 3 cm, and then soaked for 3 days. Change the rice washing water once a day; after soaking, filter and dry the shellac resin for the first bleaching, then measure 600mL of citric acid and distilled water at a volume ratio of 1:1 to mix the impregnating solution into a glass cup, and pour 100g of the first bleaching Immerse the bleached lac resin into the impregnation solution, place it on a shaker and oscillate overnight; filter and separate the lac resin particles with gauze, put them in a ventilated place to dry naturally, and set aside, weigh 200-300g white radish and distilled water 8 times its volume. Mix, pour into an iron pot and heat to boiling for 30 minutes, filter and remove the radish residue to obtain the cooking solution; sp...

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Abstract

The invention discloses a bleaching method of shellac resin, and belongs to the field of shellac resin. The method includes bleaching the shellac resin by using rice-washing water, citric acid and turnip soup in order, bleaching the shellac resin by using soap insolation method and hydrogen peroxide bleaching method to obtain the refined bleaching shellac. The bleaching technology is chloride-free, nontoxic and pollution-free, and has high processing efficiency, simple technology, and convenient operation. The used bleaching agent has high bleachability, and is green and safe. Moreover, the obtained shellac resin has high quality, and the color index of shellac is less than 2.0.

Description

technical field [0001] The invention discloses a bleaching method of lac resin, which belongs to the field of lac resin. Background technique [0002] Lac is a natural resin secreted by lac insects. It is non-toxic, has good electrical insulation properties, strong adhesiveness and thermoplasticity; it is waterproof, moisture-proof, rust-proof, and corrosion-resistant. It is widely used in military, electrical , coatings, paints, machinery, rubber, plastics, leather, paper, medicine, food and other industries. Shellac varnish is a brown translucent or pale yellow transparent liquid obtained by dissolving shellac flakes, bleached shellac or dewaxed bleached shellac in ethanol. It dries quickly after painting, forming a protective film with excellent hardness and electrical insulation, and can be polished to show a bright color. Mainly used for painting wood and electrical insulation materials. [0003] There is a water-insoluble natural pigment in shellac—red lacin, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09F1/02
CPCC09F1/02
Inventor 袁春华王统军林茂平
Owner 浙江巅峰实业有限公司
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