A kind of melamine modified resin glue for flax chipboard and its preparation method

Abstract

The invention discloses a melamine modified resin adhesive for flax chip shaving boards, and a preparation method thereof. The resin adhesive comprises, by weight, 1230-1600 parts of formaldehyde, 1050-1300 parts of melamine, 40-80 parts of diglycol, 30-80 parts of caprolactam and 700-1000 parts of water. Melamine is used to substitute urea in order to be used for synthesizing melamine-formaldehyde resin, so the colorless and semitransparent properties of resin are reserved, and the resin adhesive also has the advantages of suitable storage period, controllable cost, improved water and heat resistance, and solidification at normal temperature.

Description

technical field [0001] The invention belongs to the field of resin preparation, and in particular relates to a melamine-modified resin glue used for flax chipboard and a preparation method thereof. Background technique [0002] The thickness of wood raw materials used to make glued wood is generally more than 20mm, and its length and width are larger, and wood is a poor conductor of heat. ) conditions, or set up a high-frequency heating device in the wood bonding section to increase the ambient temperature and speed up the chemical reaction speed of the adhesive cured under medium and high temperature conditions. However, considering the investment in high-frequency heating equipment and the stability of equipment operation, the adhesives used by domestic glulam manufacturers are room temperature curing adhesives. [0003] The wood structure adhesives that are fast curing at room temperature in the domestic market now include resorcinol-phenol-formaldehyde resin, resorcinol...

AI Technical Summary

Problems solved by technology

[0004] (1) Most of the above five types of room temperature curing wood adhesives rely on foreign imports such as Japan and Finland. So far, the room temperature curing structural adhesives developed and produced by my country have not been used on a large scale in domestic wood structure projects. There are potential safety hazards in the sustainable and healthy development of wooden structural components;

[0005] (2) When resorcinol-phenol-formaldehyde resin and resorcinol-formaldehyde resin are used for the bonding of glued wood components, the bonding performance is excellent, but the glue seam is red and black, which is different from the conventional light color to be bonded. The appearance of wood is extremely uncoordinated, and the free phenolic substances contained in it have adverse effects on human health and the environment;

[0006] (3) The glulam components bonded by urea-formaldehyde resin meet the requirements of the standard specification when used in a dry state, and the price of the resin is low, but in the outdoor or indoor environment where the ambient temperature and humidity change rapidly, the resin is affected by the changing environment Large, the molecular chain is easily broken, the bond strength is lost quickly, and the application field is greatly limited;

[0007] (4) Melamine-formaldehyde resin has high activity, short storage period, high brittleness of the cured adhesive layer, insufficient toughness, and high price;

[0008] (5) There is no supply of room temperature curing melamine-urea-formaldehyde resin for glued wood in the domestic market;

[0009] (6) The price of polyurethane resin is generally 2-4 times that of resorcinol-phenol-formaldehyde resin, which brings difficulties to the cost control of domestic glued wood component manufacturers

However, the combination of flax chipboard and melamine modified resin adhesive is high, which not only affects the surface quality of the plywood, but also causes a decrease in the bonding strength of the plywood, resulting in cracking and bubbling