A low-wastewater-emission dyeing method of wood powder for high-fastness color wood-plastic composite materials

Abstract

The invention discloses a dyeing method with low waste water discharge of wood meal for a colorful wood-plastic composite material with high fastness. The dyeing method comprises the following steps of: step 1, carrying out graft modification treatment on the wood meal for the wood-plastic composite material by a positive ion modifier; step 2, directly dyeing the wood meal subjected to the graft modification treatment by a dye in a sun-proof series; step 3, washing the dyed and dehydrated wood meal with hot water once so as to remove non-sessile dye and improve the fastness of the dyed wood meal; and step 4, adding residual dyeing liquid with the dye concentration consistent to that of the dye in the step 2 into the modified wood meal in the step 1, dyeing the modified wood meal with the residual liquid by a dyeing method in the step 2, and washing the dyed wood meal according to the step 3, and circulating the step 1 to the step 4. With the adoption of the dyeing method provided by the invention, the dye enters the inner part of fibers of the wood meal, and is not only adhered to the surface of the wood meal, so that the coloring force can be improved, and the bright colorful wood-plastic material can be obtained. The dyeing method can be used for improving sun-proof fastness and the water immersion fastness of the dyed wood meal or the wood-plastic material.

Description

technical field [0001] The invention relates to the technical field of modification and dyeing of wood powder, in particular to a low-wastewater-discharge dyeing method of wood powder for high-fastness colored plastic-wood composite materials. Background technique [0002] Wood-plastic composite materials (referred to as wood-plastic materials) refer to pretreated plant fibers or powders (such as wood, bamboo, peanut shells, coconut shells, flax, straw, etc.) A new type of material compounded with additives. It has the characteristics of two materials, such as the water resistance and anticorrosion of plastic and the texture of wood. It can replace wood and steel in many fields. It can truly replace wood and steel with plastic, and can be produced into various secondary and tertiary products. [0003] Since the plastics used in processing are both new plastics and recycled waste plastics, the appearance of plastic wood materials greatly reduces the damage to the environment...

AI Technical Summary

Problems solved by technology

Even so, through extensive literature search, there are very few reports on the application of dye-dyed colored wood-plastic materials at home and abroad, and the only reports are only to mix pigments in plastics for coloring. Wood powder, which accounts for the vast majority of materials, has no affinity and poor coloring performance, and the pigment can only be mixed between the plastic and wood powder, resulting in the final wood-plastic product's color appearance not bright enough, and affecting the bonding between plastic and wood powder performance

The dyeing of wood is basically mature at home and abroad, but the wood can only be colored on the surface, and the light fastness and washing fastness are also very poor, so it is not suitable for outdoors, especially open-air occasions, so the dyeing of wood in the traditional sense Methods and techniques cannot be simply copied to wood powder dyeing

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