Flakeboard and method of manufacturing the same

Abstract

The invention relates to a particle board with low formaldehyde emission and the preparation method, wherein, the preparation method comprises the following steps: grinding the tea waste into fibrous or powder material; well mixing the fibrous or powder material and wood chips; applying adhesive to form mixture; forming the mixture into billets and pressing into particle boards. Ammonia or alkaline salt solution can be sprayed on the tea waste before being ground for activating treatment. The preparation method has the advantages that the tea waste and the wood chips are mixed for use; formaldehyde emission in the particle board is fundamentally reduced through the chemical reaction of the tea waste and the formaldehyde, the effect is obvious, permanent and free from rebound; the mechanical property of the prepared particle board is not reduced, but increased somewhat.

Description

Technical field [0001] The invention relates to a particle board and a preparation method thereof, in particular to a particle board with low formaldehyde emission and a preparation method thereof. Background technique [0002] In the past 30 years of reform and opening up, my country's timber industry has developed rapidly. In 2006, the output value of my country's wood-based panels was 127 billion yuan, and the total output of wood-based panels was 74.28 million cubic meters, of which 843 million cubic meters of particle boards. The total output of wood-based panels and furniture output rank first in the world. [0003] Because formaldehyde-based adhesives are commonly used in the production of wood-based panels, especially the large-scale use of urea-formaldehyde resin adhesives, the wood-based panels and their products (furniture, wooden floors, indoor wooden decoration materials, etc.) have formaldehyde release problems, which are caused by indoor air pollution. The main sou...

AI Technical Summary

Problems solved by technology

For example, 1) Although the use of a low molar ratio modified urea-formaldehyde resin adhesive can effectively reduce the formaldehyde emission of wood-based panel products, the bonding strength of the product is often reduced, which cannot meet the requirements; the curing time is prolonged and the production efficiency is reduced; 2) the use of other Environmentally friendly adhesives, such as isocyanate adhesives, often lead to a substantial increase in the production cost of wood-based panels, which is difficult for enterprises and users to accept; 3) Adding formaldehyde scavenger to the urea-formaldehyde resin adhesive for wood-based panels can effectively reduce free formaldehyde in wood-based panels. release amount, but it often reduces the bonding strength of wood-based panels at the same time; at the same time, the price of general formaldehyde capture agents is often much higher than that of urea-formaldehyde resin adhesives, and its addition increases product costs and reduces product competitiveness. FC-5 formaldehyde scavenger sold at 50,000 yuan / ton. If 1%-2% is added to the glue, the cost of urea-formaldehyde resin per ton will increase by 500-1,000 yuan; 4) Post-treatment of wood-based panels, For example, the invention patent application with the publication number CN1526528 discloses a manufacturing process of E1 / E0 grade environment-friendly wood-based panels, using the ammonia vacuum method, and the utility model patent with the publication number CN2394770 discloses a method for reducing formaldehyde release from wood-based panels. A large amount of processing equipment, but the investment in post-processing equipment is often large