Drying method of bleached lac

A technology of bleaching shellac and drying method, which is applied in the direction of natural resin refining, etc., which can solve the problems of long drying time, low drying efficiency, and high moisture content of bleached shellac, and achieve remarkable dehydration and drying effects, low drying energy consumption, and high moisture content. low effect

Inactive Publication Date: 2012-03-28
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

The drying time of bleached shellac is long, the energy consumption is high, the drying efficiency is low, the effect is poor, and the moisture content is high

Method used

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  • Drying method of bleached lac

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1. Centrifugal treatment

[0063] Send the bleached shellac particles into the centrifuge, turn on the power for centrifugation, remove the water between the shellac particles under the action of centrifugal force, and obtain centrifugal shellac particles, wherein the centrifugal speed is 5000rpm, and the centrifugation time is 15min.

[0064] 2. Heating lac particles

[0065] The centrifugal shellac particles are heated in a water bath to make the temperature of the shellac particles reach 50° C. to obtain softened shellac.

[0066] Except for the heating and softening of the lac particles by using a water bath heating method in the embodiment of the present invention, other heating methods are applicable to the present invention, such as microwave heating method, infrared heating method, heat exchanger heating and the like.

[0067] 3. Extrusion treatment

[0068] The softening shellac that temperature is 50 ℃ is sent in the open mill (being two-roller tabletting ma...

Embodiment 2

[0076] In addition to the centrifugal speed of 4500rpm and the centrifugation time of 18min during the centrifugation process; the shellac heat treatment step uses a far-infrared tunnel drying heater (Jiangsu Electric Heating Equipment Factory) to heat the shellac particles to a temperature of 30°C; the extrusion treatment step is controlled The temperature of the front and rear two rolls of the open mill is 30°C (that is, the controlled extrusion temperature is 30°C), the ratio of the rotating speed of the front and back two rolls is 1: 1.2, and the gap between the front and back two rolls is 5mm. The thickness of the film is 5mm; the airflow temperature at the inlet of the cooler in the cooling and crushing process steps is 10°C, and the temperature of the cooled shellac sheet is 10°C; the absolute pressure in the vacuum microwave drying process step is 4.5kPa, and the drying time is 25min. The ratio of microwave power to the weight of shellac fragments is 0.75:1, that is, wh...

Embodiment 3

[0079] In addition to the centrifugal speed of 4000rpm and the centrifugation time of 22min during the centrifugation process; the shellac heating process uses a tunnel microwave drying heater to heat the shellac particles to a temperature of 60°C; the extrusion process controls the temperature of the two rolls before and after the mill The temperature is 60°C, the ratio of the rotating speed of the front and rear two rolls is 1: 1.35, the gap between the front and back two rolls is 3 mm, and the thickness of the prepared bleached shellac sheet is 3 mm; It is 20 ℃, and the temperature of the shellac sheet after cooling is 20 ℃; In the vacuum microwave drying process step, the absolute pressure is 6.0kPa, the drying time is 32min, and the ratio of microwave power to the weight of shellac fragments is 0.8:1, that is, when drying When the weight of the shellac fragments was 1g, the microwave heating power was 0.8w, and when the weight of the dried shellac fragments was 1kg, the mi...

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Abstract

The invention discloses a drying method of bleached lac, which comprises the following steps: performing centrifugation process of washed bleached lac particles to remove moisture between lac particles, performing extrusion treatment of the lac particles under a low temperature condition to remove moisture in capillaries inside the particles so as to prepare sheet lac, performing microwave radiation drying treatment of the sheet lac in a vacuum state to remove residual capillary moisture and adsorbed moisture in the bleached lac. The method of the invention is operated and run at a low temperature; the drying working time is significantly shortened; the method is easy to operate, and has high automaticity; the prepared bleached lac has low water content; and the appearance color and physical and chemical indexes reach and exceed the refined bleached lac standards specified by PRC national standard - bleached lac [GB / T8140-2009].

Description

technical field [0001] The invention relates to a production method of natural resin, in particular to a production method of bleached shellac. Background technique: [0002] Lac is a natural animal resin secreted by lac insects parasitic on host plants. It is called lac because of its purple color; it is also called shellac because it is the secretion of lac insects. The raw gum contains 70-80% resin, 5-6% wax, 1-3% pigment, 1-3% water, and the rest are impurities such as insect corpses, sawdust, and silt. [0003] The main components of lac are lactones and lactides composed of hydroxy fatty acids (lactoic acid) and sesquiterpene acids (chitosanic acid). It is a macromolecular natural resin. [0004] The use of shellac has a history of 2000-3000 years. The Indian Sanskrit scripture "Atharva Veda" has recorded about the use of lac insects, lac and lac, and in ancient Chinese documents such as "Wu Lu", "Tang Materia Medica", "Compendium" and other documents, lac is include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09F1/02
Inventor 陈晓鸣张弘陈智勇郑华刘国兴陈军冯颖甘瑾张敏
Owner THE RES INST OF RESOURCES INSECTS RIRI OF THE CHINESE ACADEMY OF FORESTRY
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