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Fast-speed lakh bleaching and antichlorating method

A shellac and dechlorination technology, applied in bleaching and dechlorination, rapid bleaching and dechlorination of shellac, can solve the problems affecting the quality of shellac, long bleaching time, and many production equipment, so as to save equipment investment, The effect of short bleaching time and stable product quality

Inactive Publication Date: 2006-05-31
李琳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present existing bleaching shellac or refined bleaching shellac (dewaxed bleaching glue) owing to be subjected to the restriction of bleaching method in the existing technology, make residual a large amount of free chlorine in the glue solution after bleaching, and residual free chlorine is in Shellac is easy to deteriorate during storage, thus affecting the quality of shellac products
In addition, the existing processing technology still has the disadvantages of long bleaching time, poor continuity, many production equipment, high cost and low production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A. Take shellac, add water, add alkali in an amount sufficient to neutralize shellac acid, stir and heat to 75°C to dissolve shellac into a shellac alkali solution with a concentration below 25% by mass, and use a coarse sieve Coarse filtration, discarding residue to obtain coarsely filtered glue, and then fine filtering with a fine sieve, discarding residue to obtain finely filtered glue, and keeping the temperature of the glue at 80°C;

[0017] B, above-mentioned constant temperature is stirred at the speed of 50r / min at the glue solution of 80 ℃, adds commercially available sodium hypochlorite simultaneously, makes available chlorine content be the mass ratio of 15%, after stirring for 40min, promptly completes the bleaching of shellac and get bleach glue;

[0018] C. Warm up the bleached shellac solution obtained above to 85°C, and stir at a speed of 90r / min for 3 minutes to decompose the sodium hypochlorite by heat, and then complete the dechlorination of the bleac...

Embodiment 2

[0021] A. Take shellac, add water, add alkali in an amount sufficient to neutralize shellac acid, stir and heat to 80°C to dissolve shellac into a shellac alkali solution with a concentration below 25% by mass, and use a coarse sieve Coarse filtration, discarding residue to obtain coarsely filtered glue, and then fine filtering with a fine sieve, discarding residue to obtain finely filtered glue, and keeping the temperature of the glue at 80°C;

[0022] B, by the speed of 90r / min, the shellac alkali solution that gained temperature is kept on 80 ℃ is stirred, adds chlorine dioxide bleaching agent simultaneously, makes available chlorine content be the mass ratio of 22%, stirs 30min, gets bleaching glue ;

[0023] C. The temperature of the above-mentioned bleaching glue is raised to 80° C., and stirred at a speed of 50 r / min for 8 minutes to decompose chlorine dioxide by heat to obtain a dechlorinated glue;

[0024] D. Dewaxing the above-mentioned dechlorinated glue, adding ac...

Embodiment 3

[0026] A. Take shellac, add water, add alkali in an amount sufficient to neutralize shellac acid, stir and heat to 90°C to dissolve shellac into a shellac alkali solution with a concentration below 25% by mass, and use a coarse sieve Coarse filtration, discard the residue to obtain the coarsely filtered glue, and then use a fine sieve to perform fine filtration, discard the residue to obtain the finely filtered glue, and keep the glue at a constant temperature of 90°C;

[0027] B, by the speed of 70r / min, the shellac alkali solution that gained temperature is kept on 90 ℃ is stirred, adds liquid chlorine bleaching agent simultaneously, makes available chlorine content be the mass ratio of 22%, stirs 35min, obtains bleaching glue;

[0028] C. Heat up the above-mentioned bleaching glue solution to 95° C., and stir for 5 minutes at a speed of 80 r / min, so that the liquid chlorine is decomposed by heat to obtain a dechlorinated glue solution;

[0029] D. Dewaxing the above-mention...

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PUM

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Abstract

A fast bleaching and antichloration method with shellac is carried out by mixing shellac with soda and water, heating to 75í½95íÒC, dissolving into shellac alkaline solution with concentration<25%, filtering, keeping temperature between 75í½95íÒC, agitating for shellac alkaline solution by 50-90r / min speed, adding into chlorine-contained bleaching agent with chlorine content 15í½22wt%, agitating for 30-40mins to obtain bleaching glue, raising temperature to 85í½95íÒC, and agitating 3í½8mins by 50-90r / min speed to obtain dechloridized glue. Its advantages include long storage period, better product quality and shorter bleaching time.

Description

technical field [0001] The invention relates to a bleaching and dechlorination method, in particular to a rapid bleaching and dechlorination method for shellac, which belongs to the technical field of chemical product processing and treatment. Background technique [0002] Shellac is a resin with strong adhesive force. Shellac resin is a polyester resin derived from hydroxy acids with a molecular weight of 300-3000. It is mainly composed of pavlocarpic acid and chitosan acid, and also contains substances such as wax and pigment. In addition to adhesion, shellac resin also has good electrical insulation performance, waterproof performance, moisture-proof and rust-proof performance, anti-ultraviolet performance, oil resistance and acid resistance, and is non-toxic and irritating to the human body, and has strong plasticity and solidity. Good color performance, etc., so it is widely used in agriculture, light industry, heavy industry production, and people's daily necessities ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09F1/02
Inventor 李琳
Owner 李琳
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