Formaldehyde-free wood adhesive and preparation method thereof

Abstract

The invention discloses a formaldehyde-free wood adhesive. The formaldehyde-free wood adhesive consists of the following components in percentage by weight: 0 to 94.8 percent of water, 5 to 99.8 percent of mixed vegetable protein powder, 0.1 to 94.9 percent of PPE-N, 0.05 to 5 percent of preservative, 0 to 15 percent of pH regulator, 0 to 10 percent of thickening agent, 0.05 to 15 percent of antifreeze and 0 to 20 percent of filler, wherein the mixed vegetable protein powder is a mixture formed from defatted soybean powder and defatted pea protein powder or defatted cottonseed meal powder or defatted castor meal powder in a weight ratio of (1-5):1; and the PPE-N is prepared from polyamide epichlorohydrin and urea. The wood adhesive of the invention adopts formaldehyde-free raw materials, so no formaldehyde is released in the production processes of the adhesive and an artificial sheet material; and an E0-level (GB / T9846.3-2004) artificial sheet material of which the formaldehyde release amount is far less than 0.5mg / L can be produced; and all trance formaldehyde in an artificial sheet material product is from a wood raw material per se, so that the problem of the release of the formaldehyde is solved fundamentally.

Description

technical field [0001] The invention relates to a formaldehyde-free wood adhesive, and also relates to a preparation method of the formaldehyde-free wood adhesive. Background technique [0002] The formaldehyde contained in wood-based panel products mainly comes from adhesives, except for trace amounts from the wood raw materials themselves. At present, adhesives are widely used in the wood processing industry, such as plywood, large core board, fiberboard and particle board, etc. The adhesives used are mainly "trialdehyde glue", that is, urea-formaldehyde resin, phenolic resin and melamine formaldehyde resin. Among them, urea-formaldehyde resin is widely used because of its low price and excellent performance. However, since the raw materials for preparing urea-formaldehyde resin involve formaldehyde, formaldehyde will be released during the production and use of urea-formaldehyde resin, and the artificial board processed with urea-formaldehyde resin adhesive will also The...

AI Technical Summary

Problems solved by technology

Among them, urea-formaldehyde resin is widely used because of its low price and excellent performance. However, since the raw materials for preparing urea-formaldehyde resin involve formaldehyde, formaldehyde will be released during the production and use of urea-formaldehyde resin, and the artificial board processed with urea-formaldehyde resin adhesive will also There is formaldehyde released, and the release period is 3 to 15 years, which leads to the long-term excessive formaldehyde content in the indoor air and causes serious harm to human health.

At present, many board manufacturers use urea-formaldehyde resins that reduce the molar ratio of formaldehyde, but this will reduce the bonding strength of the adhesive; or use methods such as formaldehyde masking, adsorption, and sealing, but this can only temporarily prevent the release of formaldehyde, and cannot fundamentally solve formaldehyde. Release problem, once the conditions for formaldehyde volatilization are met, this part of formaldehyde will still be released in large quantities and continue to cause harm to human health

Images