E0-grade melamine modified urea-formaldehyde resin adhesive, and preparation method and application thereof

Abstract

The invention relates to an E0-grade melamine modified urea-formaldehyde resin adhesive, and a preparation method and application thereof. The E0-grade melamine modified urea-formaldehyde resin adhesive is characterized by comprising an E0-grade melamine modified urea-formaldehyde resin, a composite curing agent and a composite filler, wherein the E0-grade melamine modified urea-formaldehyde resin is prepared from the following raw materials in parts by mass: 100 parts of formaldehyde, 0.1-0.5 part of polyvinyl alcohol, 100-200ml of basic catalyst and 200-400ml of acidic catalyst; the mol ratio of the formaldehyde to the urea+melamine (F / (U+M)) is equal to 0.80-0.98; the composite curing agent is prepared from the following raw materials in parts by mass: 200-250 parts of ammonium chloride, 150-200 parts of oxalic acid, 400-450 parts of citric acid, 100-150 parts of tartaric acid and 500-800 parts of water; and the composite filler is prepared from the following raw materials in parts by mass: 60 parts of industrial flour, 20 parts of 800-mesh light calcium carbonate and 20 parts of 800-mesh wood meal. The E0-grade melamine modified urea-formaldehyde resin adhesive is used for gluing plates. The E0-grade melamine modified urea-formaldehyde resin adhesive has the advantages of low free formaldehyde content, low cost, favorable precompression performance, good gluing performance and the like.

Description

technical field [0001] The invention relates to an E0 grade melamine-modified urea-formaldehyde resin adhesive, which is used for pressing multilayer plywood, and belongs to the field of wood science and technology in forestry engineering. Background technique [0002] At present, the consumption of urea-formaldehyde resin adhesives accounts for about 2 / 3 of the total consumption of synthetic adhesives in my country. With the implementation of the mandatory standard GB18580-2001 on "Formaldehyde Emissions in Wood-based Panels and Their Products for Interior Decoration Materials" officially promulgated by the state in January 2002, the market demand for environmentally friendly urea-formaldehyde adhesives has shown explosive growth. From a technical point of view, my country has developed E 2 Level product production technology, E 1 The production technology of high-grade products is not very perfect. In order to seek production and market stability, many well-known domesti...

AI Technical Summary

Problems solved by technology

From a technical point of view, my country has developed E 2 Level product production technology, E 1 The production technology of high-grade products is not very perfect. In order to seek production and market stability, many well-known domestic enterprises have to purchase glue from several large foreign brand companies (such as Taier and Castel), resulting in increased production costs. Profits are squeezed again

Environmentally friendly urea-formaldehyde resin adhesives are not perfect enough mainly in the following aspects: (1) In order to achieve the purpose of reducing aldehyde, there is too much free urea in the glue, and the reaction of melamine is insufficient; (2) The slab pre-pressing property is poor; (3) ) The formaldehyde emission of plywood is unstable, and the formaldehyde emission of the same batch of products varies from time to time.

Images