A biodegradable modified urea-formaldehyde resin adhesive and its application

Abstract

The invention provides a biodegradable modified urea resin adhesive and application thereof. The biodegradable modified urea resin adhesive is prepared by mixing a segmented copolymer with protein hydrolysate at a mass ratio of 1:(0.1-0.5), and can be used as an adhesive for preparing a biodegradable product. A degradable modified urea resin is prepared by using a copolymerizing and blending combined method; the degradation period of the adhesive is adjusted and controlled by controlling the addition amount and hydrolysis of the protein hydrolysate in the blending process; furthermore, a seedling culturing container prepared from the adhesive is capable of providing nutritive elements, such as nitrogen, phosphorus and potassium, in the seedling growing process, so that growth of seedlings is promoted.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a biodegradable modified urea-formaldehyde resin adhesive and its application. Background technique [0002] Urea-formaldehyde resin is a macromolecule resin polymer formed by addition reaction and polycondensation reaction of urea and formaldehyde. It is the most used adhesive in the wood processing industry. It has excellent bonding properties, good construction performance and low cost. However, the cured urea-formaldehyde resin has short connecting bonds and high cross-link density between the transverse cross-links formed, which limits the movement of the polymer chain and makes it difficult for the biological enzymes to decompose into the polymer itself. Therefore, it is difficult to biodegrade and endanger environmental safety. [0003] my country is a big agricultural country, and all kinds of crop straw resources are very rich. Mixing crushed crop straw and binder to p...

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Problems solved by technology

[0005] The patent document with the publication number CN104130732A discloses a modified urea-formaldehyde resin powder prepared by blending cottonseed protein and urea-formaldehyde resin to solve the problem of long-term release of formaldehyde in the existing urea-formaldehyde resin adhesive during use; the publication number is CN102585130A The patent literature discloses the production of urea-formaldehyde resin with one or more mixtures of glycine, alanine, leucine, isoleucine, valine, phenylalanine, and glutamic acid as a formaldehyde scavenger; Publication No. The patent literature of CN102277114A discloses a preparation method of bacterial protein urea-formaldehyde adhesive. In the production process of urea-formaldehyde adhesive, amino acid bacterial protein is added as a free formaldehyde replenisher to greatly reduce and remove free formaldehyde in the product. , improve product water resistance and stability; Publication No. CN104130732A patent document blends the synthesized urea-formaldehyde resin with cottonseed protein, and publication No. CN102585130A and CN102277114A patent document is to add amino acid or protein in the synthesis process, using Protein or amino acid modified urea-formaldehyde resin; the purpose of the protein-modified resin disclosed in these documents is to reduce the amount of formaldehyde released, so as to be suitable for wood processing industries such as wood-based panels

At present, there is no report on the development of special adhesives for straw-based seedling containers that can be used for biodegradation by protein modification.

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