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Preparation method of chitin metal salt wood preservative and its application

A wood preservative, chitosan technology, applied in the direction of coating impregnation, coating, etc., can solve the problems of great harm to human health and the environment, arsenic harmful to human health and the environment, pollution of soil and groundwater environment, etc., to achieve anti-corrosion Low toxicity, high anti-corrosion effect, good anti-loss performance

Inactive Publication Date: 2003-12-03
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although most water-soluble preservatives have good anti-corrosion effect, they have poor loss resistance
As a result, some toxic substances are released into the environment, causing environmental pollution such as soil and groundwater.
[0005] As the voices of global sustainable development, biodiversity conservation and environmental protection actions become louder and louder, people are paying more and more attention to the environmental pollution and toxicity of chemicals in the field of wood preservation, such as creosote, copper chromium Although arsenic salt (CCA), acid chromium copper salt (ACC) and cuproammonium arsenic salt (ACA) can effectively protect wood, they are very harmful to human health and the environment. Arsenic salt and chromium salt are human carcinogens. And creosote, pentachlorophenol and its salts, lindane, etc. can also have carcinogenic effects on the human body.
Not only that, but there are also many problems in the disposal and reuse of these preservative-treated wood after they are discarded, and they also cause secondary pollution to the environment.
For example, CCA is an internationally recognized antiseptic with good effect and wide application, but its loss resistance is poor, and the lost arsenic is very harmful to human health and the environment. The United States and the European Union have recently banned and restricted its use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the preparation of chitosan metal salt preservative (taking chitosan copper salt as example)

[0019] Add CuCl to 1500ml of distilled water 2 75g of chitosan was dissolved, heated in a water bath at 40-50°C, and 75 grams of chitosan was added while stirring. Stir at a constant speed (stirring speed: 300-400 rpm) after 2 hours, take it out, centrifuge, discard the supernatant, wash with distilled water until the supernatant is colorless, dry at 60±2°C to constant weight, and obtain chitosan metal Copper salt powder products.

[0020] Weigh an appropriate amount of chitosan metal salt, add 1% acetic acid aqueous solution, and stir continuously to dissolve it, and prepare the chitosan metal salt solution with required concentration.

Embodiment 2

[0021] Embodiment 2: anti-white rot experiment

[0022] According to the Chinese standard "Laboratory test method for the toxicity of wood preservatives to decaying fungi" (LY / T1283-1998), the wood anti-white rot effect of chitosan metal salts was determined.

[0023] A. Sample preparation

[0024] The healthy sapwood of Populus tomentosa Carr. was intercepted, sawn into small samples of 20 mm × 20 mm × 10 mm (thickness × width × along the grain direction), and the surface was polished with fine sandpaper. The sample wood block is firstly baked at 60°C for 2 hours, then at 80°C for 2 hours, then baked at 105±2°C to constant weight, and weighed with an electronic balance to obtain the absolute dry weight of the test block T 1 . Then put the test blocks with similar weight in the same group (the weight difference between the test blocks is not more than 0.5g), 6 blocks in each group.

[0025] B. Bacteria and their cultivation

[0026] Coriolous versicolor was selected as the...

Embodiment 3

[0066] Embodiment 3: anti-brown rot experiment

[0067] According to the Chinese standard "Laboratory Test Method for Toxicity of Wood Preservatives to Decay Fungi" (LY / T1283-1998), the wood preservative effects of chitosan metal salts and other preservatives were determined.

[0068] A. Sample preparation

[0069] The healthy sapwood of Masson pine (Pinus massoniana Lamb.) was cut and sawn into small samples of 20mm×20mm×10mm (thickness×width×grain direction), and the surface was polished with fine sandpaper. The sample wood block is firstly baked at 60°C for 2 hours, then at 80°C for 2 hours, then baked at 105±2°C to constant weight, and weighed with an electronic balance to obtain the absolute dry weight of the test block T 1 . Then put the test blocks with similar weight in the same group (the weight difference between the test blocks is not more than 0.5g), 6 blocks in each group.

[0070] B. Bacteria and their cultivation

[0071] Poria placenta was selected as the e...

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PUM

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Abstract

A chitosan-metal salt chelate as the wood preservative is prepared through dispersing chitosan or its derivative in water, dispersing at least one salt of Cu, Zn, or rare-earth metal in it, heating to 36-60 deg.C for 1.5-5 hr to obtain water-insoluble chelate, and adding at least one dilute acid to become water soluble while regulate its pH value to 2-6.

Description

technical field [0001] The invention relates to a preparation method of a preservative for wood protection and wood preservation, in particular to a preparation method of a chitosan metal salt wood preservative. [0002] The present invention also relates to the application of the above-mentioned preservative in wood preservation. Background technique [0003] Wood is a natural biological material and a renewable resource. It is an important raw material for human survival and development, and is closely related to human life. However, it has obvious biological characteristics, so it is extremely vulnerable to biological and microbial hazards such as wood-rot fungi, insects, and marine borers, which will cause discoloration, decay, and insects of the wood, which seriously affects the service life of the wood and increases It reduces the consumption of wood, wastes dwindling forest resources, and also limits the application fields of wood and bamboo. According to statistics...

Claims

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Application Information

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IPC IPC(8): B27K3/12C08L5/08
Inventor 段新芳孙芳利朱玮赵砺黄洛华
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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