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造成防腐木变色的因素有哪些?

来源:http://www.jnajgc.com 时间:2020-01-10

  造成木材变色的因素很多,主要分为两个方面:内部因素和外部因素:
  There are many factors that cause wood discoloration, mainly divided into two aspects: internal factors and external factors:
  一、引起木材变色的内部因素:
  1、 Internal factors causing wood discoloration:
  木材主要由纤维素、半纤维素、木质素和少量的提取物组成。复杂的天然高分子化合物不仅含有羧基不饱和双键和共轭体系,而且还含有羟基。
  Wood is mainly composed of cellulose, hemicellulose, lignin and a small amount of extract. Complex natural polymer compounds contain not only unsaturated double bond and conjugation system of carboxyl group, but also hydroxyl group.
  二世。造成木材变色的外部因素是:
  II. The external factors causing wood discoloration are:
  木材易受外界环境的影响,使木材表面纹理疏松、粗糙、变色和褪色,甚至木材失去表面附着纤维,由裂纹或脆性碎片逐渐脱落。
  Wood is easy to be affected by the external environment, which makes the surface texture of wood loose, rough, discolored and faded, and even the wood loses the fiber attached to the surface, and gradually falls off from cracks or brittle fragments.
  三、木材变色的原因、影响因素,如何预防和消除
  3、 The causes and influencing factors of wood discoloration and how to prevent and eliminate them
  光致变色:木材中某些材料选择吸收波长大于290nm的光,导致能级间电子的变化,形成光致变色的化学键,导致木材颜色的变化。
  Photochromism: some materials in wood choose to absorb light with wavelength greater than 290nm, resulting in the change of electrons between energy levels, forming photochromic chemical bond, leading to the change of wood color.
  光致变色防护:阻挡紫外线;改变材料中吸光成分的结构,破坏参与变色物质的结构,从而隔离氧并捕获原子氧,捕获自由基萃取溶剂
  Photochromic protection: block ultraviolet rays; change the structure of light absorbing components in materials, destroy the structure of substances involved in color change, so as to isolate oxygen and capture atomic oxygen, capture free radical extraction solvent
山东防腐木
  光致变色删除:
  Photochromic delete:
  为了消除光色现象,恢复木材表面原有的正常颜色,可以采用以下两种方法:
  In order to eliminate the phenomenon of light color and restore the original normal color of wood surface, the following two methods can be used:
  1. 用砂纸或刨刀清除。对于褪色的材料可以涂上适当的染料或颜料。
  1. Remove with sandpaper or planer. For fading materials, appropriate dyes or pigments can be applied.
  2. 用过氧化氢、亚氯酸钠等氧化漂白剂处理木材,分解破坏木材表面的发色结构体系。
  2. Hydrogen peroxide, sodium chlorite and other bleaching agents were used to treat wood, and the color structure system of wood surface was destroyed.