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Preparation method for bleaching lacca

A technology for bleaching shellac and shellac, applied in the refining of natural resins, etc., can solve the problems of limited application scope and short thermal life of bleached shellac, and achieve the effects of high preparation, easy operation and advanced technology

Inactive Publication Date: 2011-08-31
杨儒林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bleached shellac obtained by the bleached shellac technology currently used in China has a short thermal life and a yellow color, so its application range is limited to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] How to prepare bleached shellac:

[0024] (1) Dissolving: Prepare 100 parts of granular shellac by weight, 8-12 parts of sodium carbonate, 400-600 parts of soft water with pH=6.5-7.5; put the soft water into the container, heat to 40-60°C, Sodium carbonate is added to the water, after the sodium carbonate is dissolved, add granule shellac, stir, the temperature rises to 70-80°C, stir until completely dissolved, and adjust the pH to 8.5-9.2;

[0025] (2) Filtration: Filtration: 20-40 mesh filtration for the first time, 80-100 mesh filtration for the second time, 200 mesh filtration for the third time, and filter cloth filtration for the fourth time;

[0026] (3) bleaching: prepare sodium hypochlorite bleaching solution (NaClo) by 1.5-2.5 times of granular shellac weight; Add 50% of sodium hypochlorite total amount for the first time in the glue solution through filtering, stir 60-90 minutes, the second Add 30% of the total amount of sodium hypochlorite for the first tim...

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Abstract

The invention relates to a preparation method for bleached shellac, and the technique steps thereof are that: soft water is added with sodium carbonate and then particle shellac till the shellac is dissolved completely, filtrated and bleached with prepared sodium hypochlorite bleaching liquid and dechlorinated with hydrogen peroxide, and then finely filtrated and neutralized with acid, thus obtaining bleached shellac solution; the acidic bleached shellac solution is washed with soft water for a plurality of times, dried till the water content thereof is 2-3 percent, then cooled, shaped, inspected and packaged. The invention is characterized by advanced technique and reasonable design. Compared with the products prepared through the existing production technology and thermal life is improved by 2-3 times. The bleached shellac of the invention is ivory white, with 1.5-2 years shelf life.

Description

technical field [0001] The invention relates to a method for further processing shellac, in particular to a preparation method for bleached shellac. Background technique [0002] Shellac, also known as lac, is a natural resin secreted by lac insects. It has the three characteristics of moisture resistance, insulation, and the ability to bond objects of different natures. It also has excellent properties such as acid resistance, oil resistance, rust resistance, UV resistance, good color fixation, and thermoplasticity. It is non-toxic and non-irritating to operators and users. sex. Shellac is widely used in food, furniture, medicine, paint, paint, ink, water-based ink, color printing, daily cosmetics, military industry, electrical appliances, electronics and other fields. Bleached shellac involves a wide range of industries, and users in different industries have different quality requirements for bleached shellac products. The bleached shellac obtained by the bleached shel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09F1/02
Inventor 杨儒林杨昆杨娅
Owner 杨儒林