CN108329738B - Peach gum liquid and preparation method thereof - Google Patents
Peach gum liquid and preparation method thereof Download PDFInfo
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- CN108329738B CN108329738B CN201810301130.7A CN201810301130A CN108329738B CN 108329738 B CN108329738 B CN 108329738B CN 201810301130 A CN201810301130 A CN 201810301130A CN 108329738 B CN108329738 B CN 108329738B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/06—Artists' paints
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
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Abstract
The invention relates to the field of painting pigment additives, in particular to a preparation method of peach gum liquid. The preparation method of the peach gum solution comprises the following steps: (A) soaking the crushed solid peach gum in water, and adjusting the pH value to 9-10 by using triethanolamine; (B) adding a hydrogen peroxide solution until the pH value is 6-7, and then heating until the solid peach gum is completely dissolved to obtain a first treatment solution; (C) adding calcium hydroxide into the first treatment solution to obtain a second treatment solution; (D) and adjusting the pH value of the second treatment liquid to 9-10, adding a hydrogen peroxide solution, stirring, and then removing impurities through precipitation to obtain the peach gum liquid. According to the method, through the alkali protection effect, hydrogen peroxide can not damage the structure of peach gum molecules in the processes of removing the intermolecular stress of peach gum and bleaching, so that the solid content of the finally obtained peach gum liquid is high. And the bleaching effect of the hydrogen peroxide is better, so that the chromaticity of the final peach gum solution is lower.
Description
Technical Field
The invention relates to the field of painting pigment additives, in particular to peach gum liquid and a preparation method thereof.
Background
Peach gum is a colloid semitransparent substance secreted by the trunks of rosaceous plants such as peaches or wild peaches after mechanical injury or pathogenicity. The solid substance formed by air drying or other dehydration method on the tree trunk is peach gum, the peach gum is peach red or light yellow semitransparent solid block, the appearance is smooth, generally only can be swelled, is not easy to be completely dissolved, the aqueous solution is viscous, and belongs to polysaccharide substances. The original peach gum is subjected to impurity removal, hydrolysis or modification, drying and the like to obtain the solid peach gum for the commodity.
The peach gum solution formed by dissolving the solid peach gum can be used in the painting pigment, and can improve the color retention and the caking property of the pigment. However, the peach gum solution has much color, and the color is larger than that of a No. 10 colorimeter, so that the color development performance of the painting pigment is seriously influenced. And the solid content of the peach gum liquid is less than 20%, so that the caking property of the painting pigment is reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of peach gum liquid, which can be used for preparing peach gum liquid with low chroma and high solid content.
The invention discloses a preparation method of peach gum liquid, which comprises the following steps:
step (A): soaking the crushed solid peach gum in water, and adjusting the pH value to 9-10 by using triethanolamine;
step (B): adding a hydrogen peroxide solution until the pH value is 6-7, and then heating until the solid peach gum is completely dissolved to obtain a first treatment solution;
step (C): adding calcium hydroxide into the first treatment solution to obtain a second treatment solution;
step (D): and adjusting the pH value of the second treatment liquid to 9-10, adding a hydrogen peroxide solution, stirring, and then removing impurities through precipitation to obtain the peach gum liquid.
Preferably, in the step (A), the soaking time is 50-60 minutes, and the soaking temperature is 60-70 ℃.
Preferably, in the step (B), the temperature is increased to 75-80 ℃, and the temperature is maintained until the solid peach gum is completely dissolved.
Preferably, the mass percentage concentration of the hydrogen peroxide solution is 20-30%.
Preferably, in the step (C), the addition amount of the calcium hydroxide is 0.2-0.3% of the mass of the solid peach gum.
Preferably, in the step (D), after the hydrogen peroxide solution is added, the pH value is adjusted to 7 to 8.
Preferably, in the step (D), the pH of the second treatment liquid is adjusted to 9 to 10 by triethanolamine at a temperature of 65 to 75 ℃.
Preferably, in the step (D), the stirring time is 20 to 30 minutes.
Preferably, in the step (a), the pulverized solid peach gum is in a block shape of less than 5 cm.
The invention also discloses peach gum liquid which is prepared by the method of the technical scheme.
Compared with the prior art, the preparation method of the peach gum solution comprises the steps of firstly hydrolyzing solid peach gum to obtain first treatment liquid, and in the treatment process, adding hydrogen peroxide after adjusting the pH value to be alkaline, so that the intermolecular stress of the peach gum can be effectively opened, and the solid peach gum is promoted to be dissolved in water at a lower temperature. Then, calcium hydroxide is used to bind impurities in the first treatment liquid to form a precipitate. And finally, adjusting the pH value to be alkaline, adding hydrogen peroxide, oxidizing and fading the pigment in the peach gum by utilizing the strong oxidation effect of the hydrogen peroxide, and removing impurities by precipitation to obtain the peach gum solution. According to the method, through the alkali protection effect, hydrogen peroxide can not damage the structure of peach gum molecules in the processes of removing the intermolecular stress of peach gum and bleaching, so that the solid content of the finally obtained peach gum liquid is high. And the bleaching effect of the hydrogen peroxide is better, so that the chromaticity of the final peach gum solution is lower.
Through test, the solid content of the peach gum solution prepared by the invention is 30-40%, and the chroma is less than a No. 5 colorimeter.
Drawings
FIG. 1 shows a flow chart of the peach gum solution preparation method of the present invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The embodiment of the invention discloses a preparation method of peach gum liquid, which comprises the following steps, and is specifically shown in figure 1:
step (A): soaking the crushed solid peach gum in water, and adjusting the pH value to 9-10 by using triethanolamine;
step (B): adding a hydrogen peroxide solution until the pH value is 6-7, and then heating until the solid peach gum is completely dissolved to obtain a first treatment solution;
step (C): adding calcium hydroxide into the first treatment solution to obtain a second treatment solution;
step (D): and adjusting the pH value of the second treatment solution to 9-10, adding a hydrogen peroxide solution, stirring, and then precipitating and removing impurities to obtain the peach gum solution.
In the invention, the peach gum liquid with high solid content and low chroma is obtained by controlling the dissolving condition and the bleaching condition of the solid peach gum in water.
According to the invention, step (A): and soaking the crushed solid peach gum in water, and adjusting the pH value to 9-10 by using triethanolamine.
In the step (A), pulverized solid peach gum is adopted, and the pulverized solid peach gum is preferably in a block shape of less than 5 cm so as to be convenient for water absorption and expansion.
The crushed solid peach gum is soaked in water and is dispersed into smaller particles through water absorption and expansion. The soaking time is preferably 50-60 minutes, and the soaking temperature is preferably 60-70 ℃. The mass ratio of the solid peach gum to the water is preferably 1: 1.5-2.
After the solid peach gum is dispersed into smaller particles, regulating the pH value to 9-10 by using triethanolamine. The triethanolamine makes the solution alkaline, protects peach gum polysaccharide molecules with large molecular weight, and avoids excessive fracture of the peach gum polysaccharide molecules in the subsequent hydrolysis process.
Preferably, after the pH value is adjusted to 9-10 by using triethanolamine, stirring is carried out for 30-40 minutes to ensure that the triethanolamine uniformly disperses around the solid peach gum particles.
Step (B): adding a hydrogen peroxide solution until the pH value is 6-7, and then heating until the solid peach gum is completely dissolved to obtain a first treatment solution.
In the step (B), since the hydrogen peroxide has oxidation property and has very weak acidity, the dissolution of the solid peach gum is promoted by using the hydrogen peroxide solution; meanwhile, part of the peach gum polysaccharide in the solid peach gum is hydrolyzed and broken under the action of the hydrogen peroxide solution, converted into peach gum polysaccharide with smaller molecular weight and dissolved in water. The more the relatively low molecular weight peach gum polysaccharide, the lower the viscosity of the solution, and the lower the viscosity will affect the final solid content, so that the viscosity of the solution needs to be properly controlled. The mass percentage concentration of the hydrogen peroxide solution is preferably 20-30%.
And (3) stirring while adding the hydrogen peroxide solution until the pH value is 6-7, and preferably 6.5. In a relatively neutral environment, the hydrogen peroxide solution both promotes dissolution and hydrolysis of the solid peach gum particles and avoids excessive breakage of peach gum molecules.
If the solid peach gum is dissolved too fast and the pH value of the solution is lower than 6, preferably adding triethanolamine to adjust the pH value to 6-7; if the solid peach gum is too slow to dissolve and the pH value of the solution is higher than 10, the pH value is preferably adjusted to 6-7 by adding a hydrogen peroxide solution.
And (3) after the pH value is adjusted, heating, preferably to 75-80 ℃, and maintaining the temperature until the solid peach gum is completely dissolved. The invention can complete the complete dissolution of the solid peach gum by maintaining the temperature below 80 ℃, which is lower than the dissolution temperature of the peach gum in the prior art, and has better dissolution effect.
The viscosity of the obtained first treatment liquid is preferably 3000-3200 CPS.
Step (C): and adding calcium hydroxide into the first treatment liquid to obtain a second treatment liquid.
The calcium hydroxide acts to combine with impurities in the solid peach gum to form a precipitate, and the impurities are removed. The addition amount of the calcium hydroxide is preferably 0.2-0.3% of the mass of the solid peach gum. The second treatment liquid obtained can be used for bleaching treatment.
Step (D): and adjusting the pH value of the second treatment liquid to 9-10 at the temperature of 65-75 ℃, adding a hydrogen peroxide solution, stirring, and then precipitating and removing impurities to obtain the peach gum liquid.
In the step (D), the pH value of the second treatment liquid is adjusted to 9-10, preferably, the pH value of the second treatment liquid is adjusted to 9-10 by adding triethanolamine;
then, the oxidation of the hydrogen peroxide solution is used to oxidize and fade the pigment. Preferably, after the hydrogen peroxide solution is added, the pH value is gradually reduced from 9-10 to 7-8 and is close to neutral.
In the step, the second treatment liquid protects the large-molecular-weight peach gum polysaccharide molecules in the second treatment liquid by firstly raising the pH value and then bleaching the second treatment liquid by using hydrogen peroxide, so that the solid content of the peach gum liquid is maintained.
In order to fully perform the bleaching action, the stirring time is preferably 20 to 30 minutes. Then, impurities are removed through precipitation to obtain peach gum liquid. The precipitation time is preferably more than 20 hours, and more preferably 20 to 30 hours.
The invention also discloses peach gum liquid which is prepared by the method of the technical scheme.
For further understanding of the present invention, the following examples are provided to illustrate the preparation method of peach gum solution provided by the present invention, and the scope of the present invention is not limited by the following examples.
Example 1
Taking 1200kg of solid peach gum, and crushing the peach gum into blocks smaller than 5 cm by using a crusher.
Adding 1800KG of cold water into a 3-ton reaction kettle, starting a stirring button of the reaction kettle, starting gas supply and heating, then adding 1200KG of solid peach gum, stopping heating when the temperature is raised to 70 ℃, keeping the temperature at 60 ℃ for 60 minutes, starting adding 5KG of triethanolamine when the peach gum is foamed into smaller particles, adjusting the pH value to be about 10, stirring for 30 minutes, adding 8 KG-10 KG of hydrogen peroxide, and stirring for 10 minutes, wherein the pH value is about 6.5. Then, the temperature is raised for the second time, air supply is stopped when the temperature is raised to 80 ℃, and the temperature is kept at 80 ℃.
When the peach gum is completely hydrolyzed, 3kg of calcium hydroxide is added to discharge the material, and the calcium hydroxide is added to promote precipitation. Putting the mixture into a bleaching treatment pool for treatment.
Bleaching in a treatment tank at 75 deg.C, starting a stirrer, adding triethanolamine to adjust pH to 10, slowly adding hydrogen peroxide while stirring to bleach, adjusting pH to 8 to stop adding hydrogen peroxide, and stirring for 20 min. And after 20 hours of precipitation, removing impurities on the upper layer of the glue solution, pumping the clear glue solution into a clean glue solution pool, and storing to obtain the peach glue solution.
Through tests, the solid content of the prepared peach gum solution is 40%, and the chroma is less than that of a No. 5 colorimeter.
Example 2
Taking 1200kg of solid peach gum, and crushing the peach gum into blocks smaller than 5 cm by using a crusher.
Adding 1800KG of cold water into a 3-ton reaction kettle, starting a stirring button of the reaction kettle, starting gas supply and heating, then adding 1200KG of solid peach gum, stopping heating when the temperature is raised to 70 ℃, keeping the temperature at 70 ℃ for 50 minutes, starting adding 7KG of triethanolamine when the peach gum is foamed into smaller particles, adjusting the pH value to be about 10, stirring for 30 minutes, adding 8 KG-10 KG of hydrogen peroxide, and stirring for 10 minutes, wherein the pH value is about 6.5. Then, the temperature was raised for the second time, and when the temperature was raised to 80 ℃, the gas supply was stopped and the temperature was maintained at 75 ℃.
When the peach gum is completely hydrolyzed, 3kg of calcium hydroxide is added to discharge the material, and the calcium hydroxide is added to promote precipitation. Putting the mixture into a bleaching treatment pool for treatment.
Bleaching in a treatment tank at 70 deg.C, starting a stirrer, adding triethanolamine to adjust pH to 10, slowly adding hydrogen peroxide while stirring to bleach, adjusting pH to 7 to stop adding hydrogen peroxide, and stirring for 20 min. And after 20 hours of precipitation, removing impurities on the upper layer of the glue solution, pumping the clear glue solution into a clean glue solution pool, and storing to obtain the peach glue solution.
Through tests, the solid content of the prepared peach gum solution is 35%, and the chroma is less than that of a No. 5 colorimeter.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A preparation method of peach gum liquid comprises the following steps:
step (A): soaking the crushed solid peach gum in water, and adjusting the pH value to 9-10 by using triethanolamine;
step (B): adding a hydrogen peroxide solution until the pH value is 6-7, and then heating until the solid peach gum is completely dissolved to obtain a first treatment solution; the mass percentage concentration of the hydrogen peroxide solution is 20-30%;
step (C): adding calcium hydroxide into the first treatment solution to obtain a second treatment solution;
step (D): and adjusting the pH value of the second treatment liquid to 9-10, adding a hydrogen peroxide solution, stirring, and then removing impurities through precipitation to obtain the peach gum liquid.
2. The method according to claim 1, wherein in the step (A), the soaking time is 50 to 60 minutes, and the soaking temperature is 60 to 70 ℃.
3. The preparation method according to claim 1, wherein in the step (B), the temperature is raised to 75-80 ℃, and the temperature is maintained until the solid peach gum is completely dissolved.
4. The preparation method according to claim 1, wherein in the step (C), the addition amount of the calcium hydroxide is 0.2-0.3% of the mass of the solid peach gum.
5. The method according to claim 1, wherein in the step (D), the pH is adjusted to 7 to 8 after the hydrogen peroxide solution is added.
6. The method according to claim 1, wherein in the step (D), the pH of the second treatment solution is adjusted to 9 to 10 by triethanolamine at a temperature of 65 to 75 ℃.
7. The method according to claim 1, wherein the stirring time in the step (D) is 20 to 30 minutes.
8. The method as claimed in claim 1, wherein the pulverized solid peach gum in step (a) is in the form of a block of less than 5 cm.
9. Peach gum solution prepared by the method of any one of claims 1 to 8.
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| CN110339113A (en) * | 2019-07-22 | 2019-10-18 | 武汉宋桃农业科技发展有限公司 | A kind of peach colloidal solution and its preparation method and application |
| CN110973419B (en) * | 2020-01-09 | 2022-07-22 | 济南大学 | Preparation method of pearl oil apricot juice with peel |
| CN111592794B (en) * | 2020-05-28 | 2021-08-31 | 中国铝业股份有限公司 | Insulating wear-resistant paint, and preparation method and application thereof |
| CN115418127A (en) * | 2022-10-21 | 2022-12-02 | 广州市美帮祈富文仪有限公司 | Preparation method of high-chroma dry-cracking-resistant gouache painting pigment and pigment thereof |
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| CN106109354A (en) * | 2016-08-25 | 2016-11-16 | 青岛海澄知识产权事务有限公司 | A kind of preparation method of peach colloidal solution |
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Address after: 253800 No. 1, Qingzhu Road, Hengde Industrial Park, Gucheng County, Hengshui City, Hebei Province Patentee after: Hebei Qingzhu painting material technology Co.,Ltd. Address before: 253800 No. 1, Qingzhu Road, Hengde Industrial Park, Gucheng County, Hengshui City, Hebei Province Patentee before: HEBEI CHINJOO ART PIGMENT Co.,Ltd. |