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Galactomannan gum got by irradiation degradation, preparation and use thereof

A technology of galactomannan and irradiation, which is applied in coatings, natural resin coatings, etc., can solve the problems of low biodegradation and chemical degradation efficiency of galactomannan gum

Inactive Publication Date: 2009-01-21
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high viscosity characteristics of galactomannan gum aqueous solution, galactomannan gum has the disadvantage of low biodegradation and chemical degradation efficiency

Method used

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  • Galactomannan gum got by irradiation degradation, preparation and use thereof
  • Galactomannan gum got by irradiation degradation, preparation and use thereof
  • Galactomannan gum got by irradiation degradation, preparation and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation of embodiment 1 radiation degradation galactomannan gum

[0036] Acacia seed endosperm slices are hydrated, squeezed against rollers, and air-dried. The moisture content of the material is 18%. The material is put into a polyethylene plastic bag, and the bagged material is irradiated and degraded with cobalt 60-γ rays as the radiation source. , the irradiation dose is 8KGy, and then it is ground by a grinder and passed through a 500-mesh sieve to obtain radiation-degraded saponins polysaccharide gum powder. Disperse the radiation-degraded saponin locust polysaccharide gum powder in absolute ethanol at a weight ratio of 1:5, and stir for 15 minutes.

Embodiment 2

[0037] Example 2 Preparation of Radiation Degraded Galactomannan Gum

[0038] Acacia seed endosperm slices are hydrated, squeezed against rollers, and air-dried. The moisture content of the material is 21%. The material is put into a polyethylene plastic bag, and the bagged material is irradiated and degraded with cobalt 60-γ rays as the radiation source. , the irradiation dose is 7KGy, and then it is ground by a grinder and passed through a 500-mesh sieve to obtain radiation-degraded saponins polysaccharide gum powder. Disperse the radiation-degraded saponin locust polysaccharide gum powder in absolute ethanol according to the weight ratio of 1:3, and stir for 15 minutes.

Embodiment 3

[0039] Example 3 Preparation of Radiation Degraded Galactomannan Gum

[0040] The endosperm slices of Tara seeds are hydrated, squeezed on opposite rollers, and dried by air flow. The moisture content of the material is 22%. The material is put into a polyethylene plastic bag, and the bagged material is irradiated with cobalt 60-γ rays as the radiation source. Degradation, the irradiation dose is 7KGy, then through the grinder grinding and all pass through 500 mesh sieve, make radiation degradation saponins polysaccharide gum powder. Disperse the radiation-degraded acacia polysaccharide gum powder in absolute ethanol at a weight ratio of 1:8, and stir for 15 minutes.

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Abstract

The invention relates to an irradiation degraded galactomannan which is made from endosperms of Leguminosae seeds containing galactomannan by the steps of hydration compression, air flow drying, irradiating degradation, pulverization / sifting, and dispersion with ethanol. The galactomannan has the advantages of a molecular weight between 20,000 and 50,000, a content of polysaccharides more than 87 percent, a granularity allowing the product to completely passing a 500 mesh sieve, and good dispersion, simple preparation technology, no necessity of addition of any chemical reagent, and high yielding rate of the product. Additionally, after a lacquer film is formed by the modified raw lacquer produced with the irradiation degraded galactomannan, the adhesion force of the lacquer film is significantly increased by 3 to 4 grades from grade 7, and the indexes of the lacquer film including impact resistance, scratching resistance, lacquer thickness, and drying speed are improved to different extent.

Description

technical field [0001] The invention relates to a radiation-degradable galactomannan gum, in particular to a radiation-degradable galactomannan gum which can greatly improve the performance of raw lacquer, its preparation method and its application in modified raw lacquer application. Background technique [0002] Raw lacquer is a special product of our country. As a coating, it has many excellent properties, is widely used, and has rich sources of raw materials. It is known as the "king of coatings". Raw lacquer liquid film is hard and glossy, aging resistant, acid resistant, water resistant, high temperature resistant, organic solvent resistant, wear resistant, and is a natural coating with superior insulation properties. The main component of raw lacquer is urushiol, and urushiol is a catechol with unsaturated long carbon chain groups, of which triene urushiol accounts for about 40%-70%, followed by monoene urushiol. Studies have shown that the raw lacquer coating The q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C09D193/00C09D105/00
Inventor 朱莉伟蒋建新张卫明宋先亮孙达峰林青含田春华
Owner BEIJING FORESTRY UNIVERSITY
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