CN105838255A - Bleaching method of shellac resin - Google Patents
Bleaching method of shellac resin Download PDFInfo
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- CN105838255A CN105838255A CN201610228456.2A CN201610228456A CN105838255A CN 105838255 A CN105838255 A CN 105838255A CN 201610228456 A CN201610228456 A CN 201610228456A CN 105838255 A CN105838255 A CN 105838255A
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- lac
- resin
- bleaching
- lac resin
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09F—NATURAL RESINS; FRENCH POLISH; DRYING-OILS; DRIERS (SICCATIVES); TURPENTINE
- C09F1/00—Obtaining purification, or chemical modification of natural resins, e.g. oleo-resins
- C09F1/02—Purification
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- Agricultural Chemicals And Associated Chemicals (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
- Storage Of Fruits Or Vegetables (AREA)
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
The invention discloses the method for bleaching of a kind of lac resin, belong to lac resin field.
Background technology
Lac is by the oozy a kind of natural resin of lac insect, have nontoxic, electrical insulation capability good, cohesive and thermoplastic are strong；The characteristics such as waterproof, moistureproof, antirust, corrosion resistant, be widely used in military affairs, electrically, coating, paint, machinery, rubber, plastics, process hides, papermaking, medicine, in the industry such as food.French polish is translucent or light yellow clear liquid by shellac, bleaching shellac or refined bleached lac dissolving brown in ethanol.It is dried rapidly after brushing, is formed and there is excellent hardness and electrical insulating property protecting film, and may be polished polishing and show the color and luster of light.It is mainly used in brushing woodenware and electrical apparatus insulation material.
Lac exists water-fast natural colouring matter erythrolaccin be very difficult to remove, cause lac product be yellow to brown, have a strong impact on lac product quality, it is therefore desirable to remove pigment, use refined bleached lac.Bleaching shellac and products thereof is increasingly becoming the main body of lac application.At present, the production of bleaching shellac, mainly based on traditional, extensive sodium hypochlorite bleaching technique.But owing to technology is not mature enough, process is complex, approach and the reaction mechanism of bleaching are still not clear, not only product quality is difficult to ensure that, lac resin also introduces substantial amounts of combined chloride in bleaching process, and in lac, the existence of combined chloride not only limit its use in industries such as food, pharmacy, cosmetics, within also being shortened to 6 months the storage period of bleaching glue product, the commodity making bleaching shellac is substantially reduced, and range of application is also restrained.The NaClO that traditional sodium hypochlorite bleaching lac method uses has severe corrosive, and it is harsh to the requirement of bleaching equipment, and the Cl easily produced in bleaching process2、CHCl3, the volatile toxic substance such as HCl workers ' health is caused harm greatly, and the application of the bleaching shellac prepared is restricted, and for solving this problem, Chinese scholars has done a few thing on combined chloride producing cause, reaction mechanism, dechlorination method.
Summary of the invention
nullThe technical problem that present invention mainly solves: be very difficult to remove for there is water-fast erythrolaccin in lac，Causing lac product is that yellow is to brown，Have a strong impact on lac product quality，And tradition bleaching shellac method is to use sodium hypochlorite to bleach，Not only there is severe corrosive，And in bleaching process, also introduce substantial amounts of combined chloride，To environment、The problem that product produces harm，Provide the method for bleaching of a kind of lac resin，Lac resin is used rice washing water by the present invention successively、Citric acid、Radish soup is tentatively bleached，Method of being exposed to the sun by lac resin soap again and hydrogen peroxide bleaching method proceed bleaching，Final refined bleached lac，Bleaching process of the present invention is without chlorine、Nontoxic、Pollution-free，Treatment effeciency is high，Technique is simple，Easy to operate，The bleaching agent used not only bleachability is high，And green safety，The lac resin quality obtained is high，Lac color index is less than 2.0.
In order to solve above-mentioned technical problem, the technical solution adopted in the present invention is:
(1) lac resin to be bleached is ground into particle that particle diameter is 5～8mm load in ceramic pot, then in tank, adds rice washing water, until submergence lac resin beyond resin surface 2～3cm, be standing and soak for 2～3 days, an every other day rice washing water of replacing；
(2) lac resin of first bleaching is filtered, is dried to obtain in immersion after terminating, measure 500～600mL citric acids again and maceration extract that distilled water carries out mixing for 1:1 by volume is poured in glass, lac resin after bleaching 50～100g for the first time immerses maceration extract, is placed on shaking table vibration steeped overnight；
(3) with filtered through gauze isolated lac resin particle, it is placed on ventilation natural air drying, standby, weigh 200～300g ternips and mix with its volume 5～8 times of distilled water, pour iron pan into and be heated to boiling 20～30min of seething with excitement, filter removal radish slag and obtain boiling liquid；
(4) after air-drying, standby lac resin is laid on stainless steel mesh, after repeatedly rinsing lac resin 3～5 times with boiling liquid obtained above, directly move in suds, control suds consumption to be totally submerged by lac resin, by sonic oscillation instrument oscillation treatment 3～5h under 200～300W power；
(5) pull lac resin out after ultrasonically treated end, load good seal in transparent freshness protection package, be placed under burning sun and tan by the sun 2～3h, then the lac resin particle after tanning by the sun is dissolved in its volume 5～7 times of absolute ethyl alcohols obtaining lac ethanol solution；
(6) in above-mentioned lac ethanol solution, add lac resin volume 2～3 times of mass concentrations are 30% hydrogen peroxide, move in 50～60 DEG C of water-baths, move into after adding thermal agitation reaction 1～2h in vacuum concentration pot, reduce pressure inside the tank to 900～1000Pa, reduced pressure concentration reclaims ethanol, the lac after i.e. can being bleached.
The application process of the present invention: the lac color index that the present invention prepares is less than 2.0, quality is high, can be widely used in the industry such as food, medical treatment military project, electronics, coating, lac is applied when food, can be as shape-fixing agent, anti-blushing agent, the fruit glaze agent of fruit freshness preserving, apply the coating of tablet and the capsule in pharmaceuticals industry with targeting and slow releasing function, the binder film of tooth treatment and oral composition etc..
The invention has the beneficial effects as follows:
(1) bleaching process of the present invention is without chlorine, nontoxic, pollution-free, and treatment effeciency is high, and technique is simple, easy to operate；
(2) bleaching agent of the present invention not only bleachability is high, and green safety, the lac resin quality obtained is high, and lac color index is less than 2.0.
Detailed description of the invention
First lac resin to be bleached is ground into particle that particle diameter is 5～8mm load in ceramic pot, then in tank, adds rice washing water, until submergence lac resin beyond resin surface 2～3cm, be standing and soak for 2～3 days, an every other day rice washing water of replacing；Soak the lac resin filtering, being dried to obtain first bleaching after terminating, measure 500～600mL citric acids again and maceration extract that distilled water carries out mixing for 1:1 by volume is poured in glass, lac resin after bleaching 50～100g for the first time immerses maceration extract, is placed on shaking table vibration steeped overnight；With filtered through gauze isolated lac resin particle, it is placed on ventilation natural air drying, standby, weigh 200～300g ternips and mix with its volume 5～8 times of distilled water, pour iron pan into and be heated to boiling 20～30min of seething with excitement, filter removal radish slag and obtain boiling liquid；After air-drying, standby lac resin is laid on stainless steel mesh, after repeatedly rinsing lac resin 3～5 times with boiling liquid obtained above, directly move in suds, control suds consumption and lac resin is totally submerged, by sonic oscillation instrument oscillation treatment 3～5h under 200～300W power；Pull lac resin out after ultrasonically treated end, load good seal in transparent freshness protection package, be placed under burning sun and tan by the sun 2～3h, then the lac resin particle after tanning by the sun is dissolved in its volume 5～7 times of absolute ethyl alcohols obtaining lac ethanol solution；In above-mentioned lac ethanol solution, add lac resin volume 2～3 times of mass concentrations are 30% hydrogen peroxide, move in 50～60 DEG C of water-baths, move into after adding thermal agitation reaction 1～2h in vacuum concentration pot, reduce pressure inside the tank to 900～1000Pa, reduced pressure concentration reclaims ethanol, the lac after i.e. can being bleached.
Example 1
First lac resin to be bleached is ground into particle that particle diameter is 5mm load in ceramic pot, then in tank, adds rice washing water, until submergence lac resin beyond resin surface 2cm, be standing and soak for 2 days, an every other day rice washing water of replacing；Soak the lac resin filtering, being dried to obtain first bleaching after terminating, measure 500mL citric acid again and maceration extract that distilled water carries out mixing for 1:1 by volume is poured in glass, lac resin after being bleached for the first time by 50g immerses maceration extract, is placed on shaking table vibration steeped overnight；With filtered through gauze isolated lac resin particle, it is placed on ventilation natural air drying, standby, weigh 5 times of distilled water of 200g ternip and its volume and mix, pour iron pan into and be heated to the boiling 20min that seethes with excitement, filter removal radish slag and obtain boiling liquid；After air-drying, standby lac resin is laid on stainless steel mesh, after repeatedly rinsing lac resin 3 times with boiling liquid obtained above, directly move in suds, control suds consumption and lac resin is totally submerged, by sonic oscillation instrument oscillation treatment 3h under 200W power；Pull lac resin out after ultrasonically treated end, load good seal in transparent freshness protection package, be placed under burning sun and tan by the sun 2h, then the lac resin particle after tanning by the sun is dissolved in 5 times of absolute ethyl alcohols of its volume obtaining lac ethanol solution；Adding 2 times of mass concentrations of lac resin volume in above-mentioned lac ethanol solution is 30% hydrogen peroxide, move in 50 DEG C of water-baths, move in vacuum concentration pot after adding thermal agitation reaction 1h, reduction pressure inside the tank to 900Pa, reduced pressure concentration reclaims ethanol, the lac after i.e. can being bleached.
The lac color index that the present invention prepares is 1.9, quality is high, can be widely used in the industry such as food, medical treatment military project, electronics, coating, lac is applied when food, can be as shape-fixing agent, anti-blushing agent, the fruit glaze agent of fruit freshness preserving, apply the coating of tablet and the capsule in pharmaceuticals industry with targeting and slow releasing function, the binder film of tooth treatment and oral composition etc..
Example 2
First lac resin to be bleached is ground into particle that particle diameter is 6mm load in ceramic pot, then in tank, adds rice washing water, until submergence lac resin beyond resin surface 2.5cm, be standing and soak for 2.5 days, an every other day rice washing water of replacing；Soak the lac resin filtering, being dried to obtain first bleaching after terminating, measure 550mL citric acid again and maceration extract that distilled water carries out mixing for 1:1 by volume is poured in glass, lac resin after being bleached for the first time by 75g immerses maceration extract, is placed on shaking table vibration steeped overnight；With filtered through gauze isolated lac resin particle, it is placed on ventilation natural air drying, standby, weigh 6 times of distilled water of 250g ternip and its volume and mix, pour iron pan into and be heated to the boiling 25min that seethes with excitement, filter removal radish slag and obtain boiling liquid；After air-drying, standby lac resin is laid on stainless steel mesh, after repeatedly rinsing lac resin 4 times with boiling liquid obtained above, directly move in suds, control suds consumption and lac resin is totally submerged, by sonic oscillation instrument oscillation treatment 4h under 250W power；Pull lac resin out after ultrasonically treated end, load good seal in transparent freshness protection package, be placed under burning sun and tan by the sun 2.5h, then the lac resin particle after tanning by the sun is dissolved in 6 times of absolute ethyl alcohols of its volume obtaining lac ethanol solution；Adding 2.5 times of mass concentrations of lac resin volume in above-mentioned lac ethanol solution is 30% hydrogen peroxide, move in 55 DEG C of water-baths, move in vacuum concentration pot after adding thermal agitation reaction 1.5h, reduction pressure inside the tank to 950Pa, reduced pressure concentration reclaims ethanol, the lac after i.e. can being bleached.
The lac color index 1.8 that the present invention prepares, quality is high, can be widely used in the industry such as food, medical treatment military project, electronics, coating, lac is applied when food, can be as shape-fixing agent, anti-blushing agent, the fruit glaze agent of fruit freshness preserving, apply the coating of tablet and the capsule in pharmaceuticals industry with targeting and slow releasing function, the binder film of tooth treatment and oral composition etc..
Example 3
First lac resin to be bleached is ground into particle that particle diameter is 8mm load in ceramic pot, then in tank, adds rice washing water, until submergence lac resin beyond resin surface 3cm, be standing and soak for 3 days, an every other day rice washing water of replacing；Soak the lac resin filtering, being dried to obtain first bleaching after terminating, measure 600mL citric acid again and maceration extract that distilled water carries out mixing for 1:1 by volume is poured in glass, lac resin after being bleached for the first time by 100g immerses maceration extract, is placed on shaking table vibration steeped overnight；With filtered through gauze isolated lac resin particle, it is placed on ventilation natural air drying, standby, weigh 8 times of distilled water of 200～300g ternips and its volume and mix, pour iron pan into and be heated to the boiling 30min that seethes with excitement, filter removal radish slag and obtain boiling liquid；After air-drying, standby lac resin is laid on stainless steel mesh, after repeatedly rinsing lac resin 5 times with boiling liquid obtained above, directly move in suds, control suds consumption and lac resin is totally submerged, by sonic oscillation instrument oscillation treatment 5h under 300W power；Pull lac resin out after ultrasonically treated end, load good seal in transparent freshness protection package, be placed under burning sun and tan by the sun 3h, then the lac resin particle after tanning by the sun is dissolved in 7 times of absolute ethyl alcohols of its volume obtaining lac ethanol solution；Adding 3 times of mass concentrations of lac resin volume in above-mentioned lac ethanol solution is 30% hydrogen peroxide, move in 60 DEG C of water-baths, move in vacuum concentration pot after adding thermal agitation reaction 2h, reduction pressure inside the tank to 1000Pa, reduced pressure concentration reclaims ethanol, the lac after i.e. can being bleached.
The lac color index 1.8 that the present invention prepares, quality is high, can be widely used in the industry such as food, medical treatment military project, electronics, coating, lac is applied when food, can be as shape-fixing agent, anti-blushing agent, the fruit glaze agent of fruit freshness preserving, apply the coating of tablet and the capsule in pharmaceuticals industry with targeting and slow releasing function, the binder film of tooth treatment and oral composition etc..
Claims (1)
1. the method for bleaching of a lac resin, it is characterised in that concrete blanching step is:
(1) lac resin to be bleached is ground into particle that particle diameter is 5～8mm load in ceramic pot, then in tank, adds rice washing water, until submergence lac resin beyond resin surface 2～3cm, be standing and soak for 2～3 days, an every other day rice washing water of replacing；
(2) lac resin of first bleaching is filtered, is dried to obtain in immersion after terminating, measure 500～600mL citric acids again and maceration extract that distilled water carries out mixing for 1:1 by volume is poured in glass, lac resin after bleaching 50～100g for the first time immerses maceration extract, is placed on shaking table vibration steeped overnight；
(3) with filtered through gauze isolated lac resin particle, it is placed on ventilation natural air drying, standby, weigh 200～300g ternips and mix with its volume 5～8 times of distilled water, pour iron pan into and be heated to boiling 20～30min of seething with excitement, filter removal radish slag and obtain boiling liquid；
(4) after air-drying, standby lac resin is laid on stainless steel mesh, after repeatedly rinsing lac resin 3～5 times with boiling liquid obtained above, directly move in suds, control suds consumption to be totally submerged by lac resin, by sonic oscillation instrument oscillation treatment 3～5h under 200～300W power；
(5) pull lac resin out after ultrasonically treated end, load good seal in transparent freshness protection package, be placed under burning sun and tan by the sun 2～3h, then the lac resin particle after tanning by the sun is dissolved in its volume 5～7 times of absolute ethyl alcohols obtaining lac ethanol solution；
(6) in above-mentioned lac ethanol solution, add lac resin volume 2～3 times of mass concentrations are 30% hydrogen peroxide, move in 50～60 DEG C of water-baths, move into after adding thermal agitation reaction 1～2h in vacuum concentration pot, reduce pressure inside the tank to 900～1000Pa, reduced pressure concentration reclaims ethanol, the lac after i.e. can being bleached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610228456.2A CN105838255B (en) | 2016-04-13 | 2016-04-13 | A kind of method for bleaching of lac resin |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610228456.2A CN105838255B (en) | 2016-04-13 | 2016-04-13 | A kind of method for bleaching of lac resin |
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| CN105838255A true CN105838255A (en) | 2016-08-10 |
| CN105838255B CN105838255B (en) | 2019-02-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB596176A (en) * | 1944-07-21 | 1947-12-30 | Mathieson Alkali Works | Improvements in shellac bleaching |
| US6348217B1 (en) * | 2000-08-04 | 2002-02-19 | Mantrose-Haeuser Co. Inc. | Method for preparing stable bleached shellac |
| US20130066045A1 (en) * | 2011-03-02 | 2013-03-14 | The United States Government As Represented By The Secretary Of The Army | Ph-sensitive sacrificial materials for the microfabrication of structures |
| CN103013338A (en) * | 2012-12-12 | 2013-04-03 | 中国林业科学研究院资源昆虫研究所 | Method for bleaching shellac resin |
| US20140065079A1 (en) * | 2012-09-05 | 2014-03-06 | d-ANTAEUS | Method for de-coloring shellac, de-colored shellac, compositions comprising same, and uses therefor |
-
2016
- 2016-04-13 CN CN201610228456.2A patent/CN105838255B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB596176A (en) * | 1944-07-21 | 1947-12-30 | Mathieson Alkali Works | Improvements in shellac bleaching |
| US6348217B1 (en) * | 2000-08-04 | 2002-02-19 | Mantrose-Haeuser Co. Inc. | Method for preparing stable bleached shellac |
| US20130066045A1 (en) * | 2011-03-02 | 2013-03-14 | The United States Government As Represented By The Secretary Of The Army | Ph-sensitive sacrificial materials for the microfabrication of structures |
| US20140065079A1 (en) * | 2012-09-05 | 2014-03-06 | d-ANTAEUS | Method for de-coloring shellac, de-colored shellac, compositions comprising same, and uses therefor |
| CN103013338A (en) * | 2012-12-12 | 2013-04-03 | 中国林业科学研究院资源昆虫研究所 | Method for bleaching shellac resin |
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Effective date of registration: 20190102 Address after: 321015 Fusancun, Fucun Town, Jindong District, Jinhua City, Zhejiang Province (in Zhejiang Ganglong Stationery Co., Ltd.) Applicant after: Jinhua Juxin Industrial Co., Ltd. Address before: 213155 Room 602, 5 Ding Units, Xinli Ming Garden, Xinbei District, Changzhou City, Jiangsu Province Applicant before: Yuan Chunhua |
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Effective date of registration: 20210708 Address after: 321000 Building 1, 602 Cuiwei Road, Jindong District, Jinhua City, Zhejiang Province Patentee after: Zhejiang Fengfeng Industrial Co.,Ltd. Address before: 321015 Fusancun, Fucun Town, Jindong District, Jinhua City, Zhejiang Province (in Zhejiang Ganglong Stationery Co., Ltd.) Patentee before: Jinhua Juxin Industrial Co.,Ltd. |