Method of treating fire retardant wood using microwave

Abstract

The invention provides a method for processing fire retarding wood with microwave. The method comprises the following steps: heating and processing wood through microwave; subjecting to vacuum pressure treatment; soaking the wood in flame retardant solution with mass ratio being 5-50% and under the atmospheric pressure of 0.1-10MPa for 3-720 minutes; subjecting to vacuum pressure treatment; and heating and treating through microwave to obtain the fire retarding wood. Since heat is not conducted from the outer part of the wood, but in the wood through the interaction between the microwave alternative electric field and water molecules, so as to quickly raise the whole temperature of the wood and improve the permeability of the heat, and meanwhile, kill bristletails and ova in the wood, improve the distribution state of flame retardant in the wood, and enable the flame retardant not to be segregated in-situ along with the migration of the solution, thus basically solving the problems with the traditional method that the flame retardant is present in large amounts on the surface of the wood and serious segregation occurs to the flame retardant when the fire retarding wood is treated. In addition to microwave heating, no additional heat energy is consumed. The fire retarding wood can be directly used as architectural decorative materials.

Description

technical field [0001] The invention relates to a method for treating flame-retardant wood, specifically a method for treating flame-retardant wood with microwave drying technology, and belongs to the technical field of wood processing. Background technique [0002] The flame retardancy of wood depends not only on the performance and dosage of flame retardants, but also on the distribution of flame retardants inside the wood. The main indicator affecting the penetration of flame retardants in wood is the fluid permeability of wood. The fluid permeability of wood is a physical quantity describing the difficulty of fluid penetration in wood. Since the penetration of fluid in wood is different from the diffusion of fluid in wood, in the process of wood treatment, the drainage of water and the infusion of liquid are both Closely related to the permeability of wood. Therefore, in order to ensure that the flame retardant can fully penetrate into the wood and form an effective dr...

AI Technical Summary

Problems solved by technology

Since wood is a poor conductor of heat, especially in the stage of low moisture content, its thermal conductivity is very low, which seriously restricts the improvement of wood drying speed.

Most of the wood drying methods in the prior art have the following problems: (1) the drying cycle is long, generally 6 to 24 hours, and the drying time of individual thicker wood is longer; (2) drying is uneven, often showing as wood surface Drying and internal humidity seriously affect the dimensional stability and mechanical properties of wood; (3) The drying efficiency is low, because most of them are intermittent dry operations, so the labor intensity is high

The main problems of the traditional method in the flame retardant treatment of wood are: (A) the drying rate is low, which is easy to cause the flame retardant treatment period of the wood to be long (the cycle of large size and high thickness wood is longer); (B) the drying is uneven, resulting in " The phenomenon of "dry on the outside and wet on the inside" will reduce the anti-corrosion performance of the wood, or increase the drying time to cause the phenomenon of "coke on the outside and dry on the inside", and even cause the surface of the wood to crack, darken the color, or even carbonize, seriously affecting the appearance and quality of the wood. Mechanical properties; (C) During the drying process of wood, the liquid containing flame retardant diffuses outwards through the traditional seepage method, causing the solute of the flame retardant to continuously migrate outwards, enriching in a large amount on the surface of the wood, and making the flame retardant The distribution in the wood is seriously uneven, and severe segregation occurs, which directly affects the flame retardant performance of the wood, and at the same time affects the properties of the wood surface and subsequent processing performance. Since the content of the fire retardant in the wood core is very small, it will , once the wood surface is damaged, the wood immediately loses its flame retardant properties, causing huge losses to production and life

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