SU1060665A1 - Adhesive composition - Google Patents

Abstract

GLUE COMPOSITION, including carbamide resin, hardener based on hydroxylamine hydrochloride and water, characterized in that, in order to reduce toxicity, increase the viability of the composition and strength of adhesion of wood materials, it contains as a hardener product of the interaction of hydroxylamine chlorohydride and temperate hardener and hardeners, and housed closures, as well as hardening of hardened gland, it contains the product of hydroxylamine chloropydrate and syrup, and also homoses, and it is also hardened by hardening glue. t

Description

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The invention relates to adhesive compositions used in woodworking, furniture, construction and other industries. The adhesive composition containing urea resin and the combined hardener ammonia water and ammonium chloride are known l. Ammonia water is used to raise the pH and slow cure at room temperature. However, ammonia water in combination with ammonium chloride leads to a significant increase in curing time, which is undesirable in many technological processes. An adhesive composition based on a water-soluble carbamide resin and a combination hardener containing urea as a stabilizing effect on the viability of the adhesive composition is known 2. As a result of the stabilizing effect of this substance, the pH and the viability of the adhesive compositions increase markedly, however, the curing time also increases significantly, which is undesirable when deciding on the intensification of the gluing process. Closest to the invention in terms of its technical nature and the result obtained is a glue composition, including: a water-soluble urea resin, 100 parts by weight. and a combined hardener of 7 parts by weight, containing by weight.h .: wine urine 2.08, ammonium chloride 1.28; hydroxylamine hydrochloride 0.189 water 3.4 h. The composition has a relatively low viability (120 minutes) is characterized by increased toxicity, does not provide high strength bonding of wood materials. The purpose of the invention is to reduce toxicity, increase the viability and strength of gluing wood materials. This goal is achieved in that the composition comprising a carbamide resin, a hardener based on hydroxylamine hydrochloride and water contains as a curing agent a product of the interaction of hydroxylamine hydrochloride and thiourea, taken in a 1 S ratio (3-10) with the following ratio of components, wt.%: Carbamide resin 54.03-57.67 The product of the interaction of hydroxylamine hydrochloride and thiourea, taken in a ratio of 1: 3.84-9.91: (3-10) Remaining Water . action of hydroxylamine hydrochloride — NHj OH HCl and thiourea (T} K) yC5. The interaction of these substances may lead to the following reactions: her-H-OH HO-NH, 4H5N.C-HH, - Hi5 HjM-C. Composition uses 68% carbamide resin KF-G. The adhesive composition is prepared in terms of 60% resin concentration, obtained by adding a calculated amount of water to a commodity resin having a concentration of 68%. Example 1. The adhesive composition is prepared as follows. With thorough mixing, 86.47 wt.% Of the urea resin 68% are poured into the mixer, then a solution of the previously prepared combination hardener consisting of 11.57 wt.% Is added. water required by calculation to bring the resin to 60%, 0.98% by weight of hydroxylamine hydrochloride and 0.98% by weight of thiourea. The order of preparation of the adhesive compositions according to examples 2-7 is similar to that described with the ratio of the components given in table. one.. . In tab. 2 “3 presentations / shadow cjparative properties of compositions. From tab. 2 and 3 it can be seen that the use of a substance formed by the interaction of hydroxylamine hydrochloride and thiourea as a hardener allows to obtain glue, which increases the viability by 3 times compared to the prototype, the content of free formaldehyde is reduced by 1.8 times, the shearing strength by the adhesive layer of dry plywood increases by 1.27 times} the resistance to spalling on the adhesive layer of plywood after soaking for 24 h increases by 1.1 times. Increasing the viability of the glue allows expanding its areas of application, reducing the free form of the dehydrate makes it possible to improve the sanitary and hygienic working conditions and reduce the toxicity of the glued materials. Improving the strength properties makes it possible to reduce the consumption of glue, for example, in the production of plywood or to reduce the material consumption of products, for example, in the production of chipboard.

Table

Urea resin, absolutely dry. cm58, 80 57.675 la 1.96 3.84 / Total hardener, including hydroxylamine chloro, 98 0, hydrate Content of formaldehyde5, 4 5.2, 5.1 yes,% Content of free formal0, 3 0.25 degid ,Table 2

3.1

0.45 6.58. 54.03 51.70 59.38 59.38 5.669.91 13.79 -. - - V 0.940.90. 0.86. 0.99 6.5. 5.3 3.7 0.2

Breaking strength lio to the adhesive layer of dry plywood, H

average maximum (s minimum).

Tensile strength when splicing ho glue layer of plywood after. 24 h K; 1 wetting, MPa

Table 3

3.25 2.36

3.34 3.60 5.19 4.65 3.40 2.97 2.20 2.28 2.00 1.65

Claims (1)

GLUE COMPOSITION, comprising a urea resin, a hardener based on hydroxylamine hydrochloride and water, it is clear that in order to reduce toxicity, increase the viability of the composition and the bonding strength of wood materials, it contains, as a hardener, the product of the interaction of hydroxylamine chlorohydrate and thiourea taken in the ratio 1: (3-10) in the following ratio of components, wt.%: Urea Resin 54.03-57.67 The product of the interaction of hydroxyl- § amine hydrochloride and thiourea, taken in the ratio 1: (3-10) · 3.84-9.91 Water Else SU „„ 1060665