Nonformaldehyde nonpoisonous adhesive and preparation method thereof

Abstract

The invention discloses a nonformaldehyde nonpoisonous adhesive and a preparation method thereof. The method comprises the following steps: firstly, adding proper water in a reactor which is provided with a stirring device; secondly, slowly adding polyvinyl alcohol into the reactor when the water is heated to 40 DEG C, heating the mixture to over 90 DEG C to ensure that the polyvinyl alcohol is completed dissolved, and preserving the heat for 1 hour; thirdly, cooling the materials to 70 DEG C, and adding polyalcohol, dispersant, emulsifier and aqueous solution of plasticizer into the reactor respectively, adding filler into the reactor, keeping stirring for 15 to 20 minutes to ensure that the raw materials are uniformly mixed, and filtering and discharging; and finally, uniformly mixing the raw materials with isocyanate in the proportion when the adhesive is used. The adhesive has simple production technology, can be subjected to both cold pressing and hot pressing, has low cost, and can completely realize non toxicity, harmlessness, greenness and environmental protection.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a formaldehyde-free, non-toxic adhesive and a preparation method thereof. Background technique [0002] Adhesives used for wood-based panels mainly include urea-formaldehyde resin (UF), phenolic resin (PF), and melamine-formaldehyde resin (MF), among which urea-formaldehyde resin (UF) is used in the largest amount. These three types of glue in the wood-based panel industry all use formaldehyde as one of the raw materials. Due to the characteristics of urea-formaldehyde glue itself - the long-term slow release of formaldehyde determines that no matter how technical improvements are made, it is impossible to completely solve the problem of free formaldehyde release, both theoretically and practically. With people's awareness of safety and With the enhancement of environmental protection awareness, the release of formaldehyde has attracted more and more attention, and it has...

AI Technical Summary

Problems solved by technology

[0003] Chen Xiaobo, Shi Junyou, and Gu Jiyou introduced in "The Development of Hot-pressed Starch-Based Waterborne Isocyanate Wood Adhesive" Journal of Northeast Forestry University 2008-7, "the annual cornstarch is used as the main raw material to prepare a huge amount, and the comprehensive performance (gluing strength and environmental protection indicators), but the preparation process of this adhesive is complicated, and the production cost cannot be greatly reduced;

[0004] Mo Yuanlie introduced a cationic pullulan wood adhesive and its preparation method in the patent No. 200610054885.8 of "Cationic Pullulan Wood Adhesive and Its Preparation Method", but polyvinyl formal is used as a stabilizer in the formula, Still can not fundamentally solve the pollution problem of formaldehyde

[0005] In the patent No. 200410017054.5 of "Wood Adhesive and Its Preparation Method", Yang Guang introduced a kind of wood adhesive with vegetable protein as the main raw material and its preparation method. There is instability in product quality in production, and the hot-pressing temperature and pressure required for plate production are high, and the quality of produced plates is difficult to guarantee