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Modified chitosan metal composite wood preservative and method for producing the same

A technology of wood preservatives and metal composites, applied in the direction of wood impregnation, impregnated wood, manufacturing tools, etc., can solve the problem of broad-spectrum antibacterial, bactericidal, insecticidal, reduce the permeability of preservatives to bamboo wood, and metal ions Low binding rate and other problems, to achieve the effect of improving anti-corrosion effect, wide application range, and improving anti-loss performance

Inactive Publication Date: 2008-12-17
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

[0003] CN1459466 patent discloses the "preparation method and application of chitosan metal salt wood preservative" technology of the Wood Industry Research Institute of the Chinese Academy of Forestry Sciences. It is a wood preservative with good effect, low toxicity and strong loss resistance , but in practical application, it is found that the agent has not yet achieved broad-spectrum antibacterial, bactericidal, and insecticidal effects, and the binding rate of metal ions is low, about 10%. If you want to increase the concentration to improve the antiseptic effect, you must increase the solution viscosity and reduce The permeability of preservatives to bamboo wood affects the antiseptic effect. How to find a new way in the dilemma and seek the way of modification has its important practical significance

Method used

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  • Modified chitosan metal composite wood preservative and method for producing the same
  • Modified chitosan metal composite wood preservative and method for producing the same
  • Modified chitosan metal composite wood preservative and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 (contrast the raw material and proportioning weight part of embodiment 1 column in table 1):

[0021] First prepare the modified chitosan metal complex: dissolve 18 parts of sodium perborate in 300 parts of deionized water, then add 24 parts of copper chloride, and slowly add 20 parts of chitosan with a molecular weight of 40 mesh and a molecular weight of 360,000 while stirring. powder (the weight ratio of metal salt to chitosan is 1.2:1), adjust the pH value of the solution to 4.5, and stir at 55° C. for 3 h. After the reaction, centrifuge and wash the insoluble part with water 2-3 times until the insoluble part does not contain free copper ions, then dry the insoluble part at 60±2°C to obtain the modified chitosan copper complex product. The content of copper ions in the modified chitosan copper complex is 16.2% as detected by atomic absorption spectrophotometer, and the content of boron element as tested by plasma emission spectrometry is 1.3%.

[0022...

experiment example

[0024] According to "Laboratory Test Method of Toxicity of Wood Preservatives to Decay Fungi" LY / T1283-1998, the anti-loss performance of the above-mentioned concentration of wood protective agents was compared with the other two protective agents. The results are shown in Table 2:

[0025] Table 2 Modified chitosan copper complex, chitosan copper complex, copper chromium arsenic preservative

[0026] Anti-loss test results in Poplar tomentosa wood

[0027]

[0028]

[0029] Note: The injection of preservatives adopts the vacuum method, the vacuum degree is 0.9MPa, and the vacuum time is 30min.

[0030] The data in table 2 shows that the modified chitosan copper complex preservative has more drug absorption than the chitosan copper complex preservative under the same treatment concentration, indicating that the modified chitosan copper complex preservative is to the penetration of wood sex increased. The fixation rates of modified chitosan copper complex preservative a...

Embodiment 2

[0041] Embodiment 2 (contrast the corresponding raw material and the proportioning value in parts by weight of embodiment 2 column in table 1):

[0042]First prepare the modified chitosan metal complex: 12 parts of sodium perborate are dissolved in 300 parts of distilled water, then add 24 parts of zinc chloride, slowly add 20g 40 mesh molecular weight while stirring and be 360,000 chitosan powder ( The weight ratio of metal salt to chitosan is 1.2:1), the pH value of the solution is adjusted to 5.5, and stirred at 50° C. for 3 hours. After the reaction, centrifuge and wash the insoluble part with water 2-3 times until the insoluble part does not contain free zinc ions, then dry the insoluble part at 60±2°C to obtain the modified chitosan zinc complex product. The content of zinc ions in the modified chitosan zinc complex is 15.4% as detected by atomic absorption spectrophotometer, and the content of boron element as tested by plasma emission spectrometry is 1.6%.

[0043] Di...

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Abstract

The invention relates to a modified chitosan metal composition wood preservative and a preparation method, which is characterized in that,16 to 30 portions of bactericidal metal salt, 15 to 25 portions of chitosan, 6 to 18 portions of perboric acid and salts thereof and 250 to 300 portions of deionized water are mixed at 30 DEG C to 60 DEG C for reaction for 2 to 4 hours, wherein, the dried solid matter is white or green or grey powdery modified chitosan metal composition; then wood preservative aqueous solution is prepared by 0.5 to 5 portions of the metal composition, 0.5 to 2 portions of acid and 100 portions of water. The modified chitosan metal composition wood preservative prepared by the method has the advantages of high metal ion binding rate, broad-spectrum and high-efficient antiseptic effect and low viscosity; by using the preservative, the internal part of wood can be entered, and antisepsis, rot resistance and insect control treatment can be carried out to wood, bamboo and other plant fiber materials by soaking, brushing, spraying, pressure impregnating, etc.

Description

technical field [0001] The invention relates to a plant fiber protective agent and a manufacturing method thereof, in particular to a bamboo wood protective agent mainly based on a modified chitosan metal compound and a manufacturing method thereof. Background technique [0002] The use of renewable resources chitin to produce wood preservatives is in line with the sustainable development strategy, and thus has attracted the attention of many experts and scholars. [0003] CN1459466 patent discloses the "preparation method and application of chitosan metal salt wood preservative" technology of the Wood Industry Research Institute of the Chinese Academy of Forestry Sciences. It is a wood preservative with good effect, low toxicity and strong loss resistance , but in practical application, it is found that the agent has not yet achieved broad-spectrum antibacterial, bactericidal, and insecticidal effects, and the binding rate of metal ions is low, about 10%. If you want to inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/52
Inventor 梁立军鲍滨福孙芳利段新芳陈安良
Owner ZHEJIANG FORESTRY UNIVERSITY
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