Water-soluble rosin resin and preparation method and application thereof

A technology of water-soluble rosin and resin, which is applied in application, protection of fruits/vegetables and food ingredients with a coating protective layer, and can solve problems such as low water solubility, residual preservatives, unfavorable cleaning of fruits and vegetables, and guarantee of the safety of fruits and vegetables. , to achieve low cost, low weight loss rate, bright color and long-lasting effect

Pending Publication Date: 2020-08-14
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the structure of the polymer itself, the water solubility of the polymer is still small, which will cause certain residues in the subsequent cleaning of the preservative, which is not conducive to ensuring the cleaning of the fruits and vegetables themselves and the guarantee of the safety of the fruits and vegetables

Method used

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  • Water-soluble rosin resin and preparation method and application thereof
  • Water-soluble rosin resin and preparation method and application thereof
  • Water-soluble rosin resin and preparation method and application thereof

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preparation example Construction

[0034] The present invention also provides a kind of preparation method of water-soluble rosin resin, comprises the following steps:

[0035] (1) After melting the maleic rosin, add PEG200 and a catalyst, and react at 180-250° C. for 1-8 hours to obtain maleic rosin polyethylene glycol ester;

[0036] (2) adding citric acid to the polyethylene glycol ester of maleic rosin, and reacting at 150-180° C. for 1-6 hours to obtain a water-soluble rosin resin.

[0037] At the same time, the present invention provides the application of the water-soluble rosin resin prepared according to the water-soluble rosin resin or the water-soluble rosin resin prepared according to the preparation method of the water-soluble rosin resin in the preservation of fruits and vegetables, adding water to the water-soluble rosin resin , alkali solution, adjust the pH to 7-8, obtain the rosin-based fruit and vegetable fresh-keeping agent, and apply the rosin-based fruit and vegetable fresh-keeping agent o...

Embodiment 1

[0039] (1) Heat 100g of maleic rosin to melt, melt at about 180°C, add 50g of PEG200 and 0.2g of nano-ZnO catalyst under stirring, slowly heat up to 220°C and react for 8 hours to obtain maleic rosin polyethylene glycol ester.

[0040] (2) Slowly add 15 g of citric acid to the obtained maleic rosin polyethylene glycol ester at 150° C. for reaction, and react for 2 hours to obtain a water-soluble rosin resin.

[0041] The acid value=170mg / g of obtained water-soluble rosin resin, softening point=95 DEG C, solubility (5%KOH aqueous solution), transparent; Heavy metal content reaches food-grade requirement, wherein, arsenic content≤2ppm, heavy metal content in lead ≤10ppm.

[0042] Such as figure 1 Shown is the GPC curve of the maleated rosin polyethylene glycol ester obtained, as can be seen from the figure, a peak with a molecular weight of 1980 appeared at about 14 minutes, indicating that the maleated rosin reacted with PEG200.

[0043] Such as figure 2 Shown is the GPC cu...

Embodiment 2

[0046](1) Heat 80g of maleic rosin to melt, melt at about 180°C, add 36g of PEG200 and 0.1g of nano-ZnO catalyst under stirring, slowly heat up to 250°C and react for 6 hours to obtain maleic rosin polyethylene glycol ester.

[0047] (2) Slowly add 45 g of citric acid to the obtained maleic rosin polyethylene glycol ester at 180° C. for reaction, and react for 2 hours to obtain a water-soluble rosin resin.

[0048] The acid value=150mg / g of obtained water-soluble rosin resin, softening point=90.5 ℃, solubility (5%KOH aqueous solution), transparent; Heavy metal content reaches food-grade requirement, wherein, arsenic content≤2ppm, heavy metal content is calculated as lead ≤10ppm.

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Abstract

The invention discloses water-soluble rosin resin and a preparation method and application thereof. The water-soluble rosin resin comprises the following raw materials in parts by weight: 80 to 100 parts of maleated rosin, 35 to 75 parts of PEG200, 10 to 50 parts of citric acid and 0.1 to 0.2 part of a catalyst. The preparation method of the water-soluble rosin resin comprises the following stepsof melting the maleated rosin, adding the PEG200 and the catalyst, and performing a reaction at 180-250 DEG C for 1-8 hours to obtain maleated rosin polyethylene glycol ester; and adding the citric acid into the maleated rosin polyethylene glycol ester, and performing a reaction at 150-180 DEG C for 1-6 hours to obtain the water-soluble rosin resin. Water and an alkali solution are added into thewater-soluble rosin resin, the pH value is adjusted to 7-8 to obtain a rosin-based fruit and vegetable preservative, and the surfaces of fruits and vegetables are coated with the obtained rosin-basedfruit and vegetable preservative. The water-soluble rosin resin disclosed by the invention is low in raw material preparation cost, easy to dissolve in the alkali solution, good in solubility, easy toclean and beneficial to guarantee of cleanness of the fruits and vegetables, and the water-soluble rosin resin disclosed by the invention is safe and reliable in component, belongs to the non-toxic grade, and is good in film-forming property and bright and durable in color and luster.

Description

technical field [0001] The invention relates to a water-soluble rosin resin and its preparation method and application, belonging to the technical field of fruit and vegetable preservation. Background technique [0002] Fruits and vegetables are rich in vitamins, minerals and other nutrients, which are an important source of human nutrition. However, due to their high water content, fruits and vegetables are susceptible to environmental factors, self-breathing, post-ripening and other physiological effects during storage and transportation after picking, resulting in reduced nutritional value and perishable deterioration, resulting in huge economic losses. Therefore, on the premise of maintaining the life activities of fruits and vegetables and ensuring the color and fragrance of fruits and vegetables, it is particularly important to extend their shelf life. [0003] At present, the most commonly used methods to control the quality of fruits and vegetables and extend the sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/16
CPCA23B7/16A23V2002/00A23V2200/22A23V2250/032A23V2250/1642
Inventor 商士斌许嘉琍张海波高宏宋湛谦
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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