Preservation Of Wood Material By Chemical Techniques

Wood becomes susceptible to decay and degradation when it is exposed to the elements. It should be treated with chemical preservatives to protect it from decay and insects. Wood preservatives can be used by only certified applicators as a form of chemical r pesticide. Only chemicals that aren’t toxic can be approved by the EPA.

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The wood material is a versatile material with unique properties that offer many benefits. However, it has three limitations that limit its use.

a) Due to its organic chemical structure, wood can be damaged by termites, wood-destroying fungi, and wood-boring beetles.

b) Wood can absorb water molecules through its free hydroxyl group. The relative humidity of the atmosphere determines the wood’s absorbed water content. Three dimensions of wood are affected by the moisture content.

c) Wood is inflammable material. This valuable product must be kept from being destroyed by termites, marine borers, and fungi. It should also be treated with water repellents to ensure it has a long service life.

Wood Preservatives

General Characteristics For Wood Preservatives

a) They must not be toxic to marine organisms, fungi, or pests.

b) They must not have any objectionable properties during use or handling.

c) They must have satisfactory properties and be able to withstand the conditions under which they are recommended.

d) They must not be corrosive.

e) They shouldn’t be too expensive.

Lindane, Dieldrin: Lindane, which was discovered in 1912, is an insecticide that does not accumulate in the natural environment. Dieldrin, which was developed in 1948 and is still used as an insecticide, is persistent in the environment. Lindane can be used to treat hardwood logs with Lyctus beetles. It is also used in joinery treatments that use a double vacuum or immersion processes. Dieldrin can be used in termite protection joinery treatments. It is also used as a water-based dispersion to treat soils. It can be used in 0.8% solutions of petroleum solvent.

Copper 8 quinolinolate: Copper 8 quinolinolate, also known as Copper-8, is a relatively new preservative. It is made by condensing copper 8-quinolinolate with nickel 2-ethylhexoate. Copper-8 is a yellow-brown solid that can be dissolved in organic solvents with nickel 2-ethylhexoate. This gives a green solution. Copper-8 is toxic to termites and wood pests, but it is relatively safe for animals and plants. This preservative can be used in wood materials for food containers, greenhouses, seedboxes, and refrigerators. The treatment solution should contain at least 0.045% Cu.

Copper naphthenate This preservative, also known as Cuprinol, was first used in the 1920s. It gives dark-green waxy solutions in organic solvents. It is not toxic to wood pests, except termites, and it is non-corrosive to steel or iron. It is used primarily as a paint-on preservative for boat maintenance. Treatment solutions contain 1-2% Cu.

Bis (trin-butil tin), oxide: It’s also known as tributil tin dioxide, TnBTO or TBTO. It is a great fungicide and more effective than PCP. TBTO is less toxic than PCP. This preservative is used primarily as a fungicide in joinery treatments, and as a general preservative to boat maintenance. TBTO can be applied in 0.5-1.0% solutions.

Waterborne Preservatives:

They are used for the impregnation of mine props and domestic buildings, as well as food containers and cooling towers. This is best for structural elements that are not painted or have no odor. The concentration of the solutions is approximately 5%.

Ammoniacal Copper Arsenite (ACA).It’s also known as Chemonite, which has the following composition: copper hydroxide (57.7%), ammonia (1.25-2.0%), and arsenic trioxide (40.7%).

Acid copper chromate: This product, also known as Celcure, consists of copper sulfate (50%) and sodium dichromate (47.5%).

CCA-Type A Preservatives have the trade name Greensalt applied to pole treatment products and Erdalith applied to lumber treatment products. CCA-Type B can be sold under Boliden Salt K-33, and CCA-Type C under Tanalith C or Celcure A.

Chromated Zinc chloride (CZC), This preservative is made of zinc chloride (79.5%) and sodium dichromate (18%)

Fluor-chrome-arsenate-phenol (FCAP): These Wolman-type preservatives are mixtures of sodium fluoride and chromate, sodium arsenate, and 2,4-dinitrophenol. To eliminate yellowing from treated timber, sodium pentachlorophenol has been replaced with 2,4-dinitrophenol. FCAP and Wolman-type preservatives were marketed under many trade names. These included Triolith and Minolith as well as Fluoxyth, Flunax, and Fluoxyth U.