Environment-friendly phenolic resin adhesive as well as preparation method and application thereof

Abstract

The invention discloses an environment-friendly phenolic resin adhesive which comprises the following raw materials in parts by weight: 30-40 parts of phenol, 55-65 parts of formaldehyde, 15-25 partsof modified soybean milk powder, 5-11 parts of melamine, 10-20 parts of sodium hydroxide, 3-6 parts of modified rice bran oil, 2-6 parts of organic montmorillonite, 1-3 parts of semicarbazide hydrochloride and 5-15 parts of deionized water. The molar ratio of phenol, formaldehyde and melamine is 1: (2.1-2.4)): (0.6-0.8), the phenol is reacted with the formaldehyde to minimize the content of free phenol, the residual formaldehyde reacts with the melamine to form a large amount of imino and hydroxyl structures, the added modified soybean milk powder reduces the usage amount of the formaldehyde,the green environmental protection property is improved, after the soybean milk powder is modified, the protein denaturation is realized, and the soybean milk powder contains a lot of hydroxyl groups.

Description

technical field [0001] The invention relates to the technical field of phenolic resin glue, in particular to an environment-friendly phenolic resin glue and its preparation method and application. Background technique [0002] There are many gaps between bamboo and wood in mechanism, performance and production process. Compared with wood, bamboo has high strength, high toughness, good wear resistance, high density, strong texture and color, and the production cycle of moso bamboo is short, and the source of raw materials is wide, especially After more than ten years of development, bamboo-based panels have become a new type of wood-based panels. The urea-formaldehyde resins and melamine-modified urea-formaldehyde resins used in wood-based panels cannot meet the production requirements of bamboo-based panels. Therefore, most bamboo plywood factories and container bottom panels The production plants all use phenolic resin adhesives for bamboo gluing. [0003] Phenolic resin i...

AI Technical Summary

Problems solved by technology

In the field of wood processing, phenolic resin is one of the main types of glue widely used, its consumption is second only to urea-formaldehyde resin, especially in the production of water-resistant and weather-resistant wood products, phenolic resin has special significance, phenolic resin adhesive has heat resistance Good, high bonding strength, good aging resistance, excellent electrical insulation, and cheap and easy to use, so it has been widely used; advantages: large polarity, strong adhesion; high rigidity, heat resistance High; good aging resistance; water resistance, oil resistance, chemical medium resistance, mold resistance; easy to modify itself, and can also modify other adhesives. Disadvantages: darker color, certain brittleness, easy to crack, especially water-soluble Compared with urea-formaldehyde resin, permanent phenolic resin has a longer curing time and higher curing temperature, and has strict requirements on the moisture content of the veneer; the phenolic resin prepared at the same time has high free phenol and free aldehyde, pollutes the environment, and has poor environmental protection, which affects the performance of phenolic resin.

[0006] Chinese patent literature (publication number: CN106117480A) discloses a high molar ratio environment-friendly phenolic resin glue and its preparation method and application. The phenolic resin glue is prepared from the following components: phenol with a mass fraction of 98%, phenol with a mass fraction of 37 % formaldehyde solution, caustic soda, process water, coupling agent, melamine, P of the present invention: F=1: (2.18-2.25), this document adds formaldehyde to be higher than common phenolic resin glue formula content, although solved phenol dosage, but increased the formaldehyde content, increased the amount of free aldehydes, although the use of melamine to reduce the aldehyde content has been provided in the literature, although the environmental protection effect has been achieved, the solution effect is not very significant, and further improvement is still needed

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