Environmental protection filling agent used for plywood glue and preparation process thereof

Abstract

The invention discloses an environmental protection filling agent used for plywood glue, which is prepared from, by mass, 60-85 parts of inorganic mineral powder, 5-15 parts of organic filler, 1-5 parts of a modifier, 2-10 parts of a thickener, 3-15 parts of an adhesive, and 0.5-5 parts of a curing agent. The inorganic mineral powder includes one or more of sepiolite, diatomite, zeolite and attapulgite; the organic filler is one of starch, flour and protein powder; the modifier includes one or more of resorcinol, melamine, thiourea, azodicarbonamide and alkyl sodium sulfonate; the thickener isone selected from sodium alginate, sodium carboxymethylcellulose and sodium polyacrylate; the adhesive is one of urea resin, phenolic resin, polyvinyl alcohol and sodium silicate; and the curing agent includes one or more of ammonium chloride, zinc chloride and ammonium sulfate. The filling agent has reasonable formula and is lower in addition of flour and more in addition of the inorganic mineral powder, so that the filling agent can adsorb formaldehyde and inhibit mildews, is better in anti-most effect and is lower in manufacturing cost. A plywood is higher in strength and better in comprehensive performance with the filling agent.

Description

technical field [0001] The invention relates to a filler for plywood glue and a preparation process thereof. Background technique [0002] At present, plywood has become the main material for indoor furniture, flooring, and decoration. More than 75% of plywood on the market uses formaldehyde-based synthetic resins as adhesives, mainly urea-formaldehyde resins and their modified products. Although after years of hard work, the production level of wood-based panel adhesives in my country has been greatly improved, but urea-formaldehyde resin adhesives still have a relatively serious formaldehyde release problem, which is the main source of formaldehyde pollution in indoor air pollution. [0003] In the production process of indoor plywood, it is necessary to add flour filler to the urea-formaldehyde resin glue to increase the consistency and adhesion of the glue. However, the traditional filler flour has a single function in plywood and flour belongs to agricultural products,...

AI Technical Summary

Problems solved by technology

However, flour as a traditional filling material has a single role in plywood and flour is an agricultural product, so a large amount of use will inevitably cause food waste

At the same time, the price of flour is higher, which increases the cost of production enterprises

[0004] Although bentonite, kaolin, attapulgite, sepiolite and other inorganic mineral powders are currently on the market as fillers for plywood glue instead of flour, but bentonite and kaolin have no formaldehyde-removing effect, and the large expansibility of bentonite is easy to cause Plywood is glued, and attapulgite and sepiolite can absorb free formaldehyde in urea-formaldehyde resin glue, but adding too much attapulgite and sepiolite instead of flour has the problem of plywood hardening. Chinese patent "CN 1506427A" discloses a "Special multifunctional filler for wood industry and its preparation process", still need to add a large amount of organic filler to ensure the strength of the board, which limits the adsorption effect of formaldehyde and fails to achieve the purpose of reducing costs