A kind of aldehyde-free light particle board and preparation method thereof

Abstract

The invention discloses an aldehyde-free light particle board and a preparation method thereof. The density ranges from 0.4 to 0.6 g / cm. 3 . The raw materials used mainly include: shavings, isocyanate, benzene ring-containing dicarboxylic acid-modified polyether polyol, tackifier, catalyst, and water. The light-weight particleboard prepared by the invention has low density and excellent performance, can meet the requirements of various performance indicators for particleboard in the national standard GB / T 4897‑2015, has excellent dimensional stability and water resistance, and can be widely used in various indoor Decoration, and the board material is light, easy to move indoors, and strong practicability.

Description

technical field [0001] The invention belongs to the field of aldehyde-free light-weight artificial boards, in particular to the field of light-weight particleboards and fiberboards, and relates to an aldehyde-free light-weight particleboard and a preparation method thereof. Background technique [0002] With the continuous shortage of forest resources, the crisis of wood shortage and rising raw material prices is becoming more and more obvious, which forces people to look for more raw material-saving processes to prepare boards and reduce the consumption of wood raw materials. The density of traditional particleboard is about 600-750kg / m 3 , each cubic board needs to consume 1.1-1.3 tons of wood raw materials, which consumes more wood. [0003] Particleboard is prepared by the existing technology, and the adhesive is mostly urea adhesive system, mainly including urea-formaldehyde, phenolic, and melamine-modified formaldehyde resin adhesive. These adhesives all use formaldeh...

AI Technical Summary

Problems solved by technology

Liu Yanlong and others reacted the isocyanate group (-NCO) in the water-foaming polyurethane prepolymer with water to form a foam, filled the gap between the shavings, and obtained a density of less than 500kg / m 3 The lightweight particleboard needs 4-10 minutes of hot pressing time, and the opening time of raw materials is short and requires a long hot pressing time, which affects the production efficiency and production cost of the product

BASF patent US8187709B2 mentions the use of EPS particles to prepare formaldehyde-free lightweight particleboard, which can be obtained with a density of 300-600kg / m 3 The lightweight particleboard, but the EPS particles contain some blowing agents, especially the recommended EPS, which contains small molecular substances such as pentane, which releases flammable gases during the hot pressing process. In the high-temperature construction environment of wood-based panels, there Safety risk, and the distribution of EPS particles in the wood-based panel is uneven, and defects are formed on the surface, which affects the board-making effect on the surface of the board

[0004] Most of the polyols mentioned in the market are polyether polyols or polyester polyols, and the end groups are hydroxyl end groups. After contacting with isocyanate adhesives, they can react quickly, and the reaction releases heat, which promotes the formation of isocyanate and water. Side reactions such as polyurea, for some fields that require a slow reaction of isocyanate glue, the performance is easily affected

The conventional method is to add inorganic acid to polyol to inhibit the activity of isocyanate. The added inorganic acid has certain corrosion on equipment, etc. and the mixing uniformity and storage stability are poor.

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