SU939517A1 - Water-activated adhesive composition - Google Patents

Description

(5) WATER-ACTIVATED GLUE

The invention relates to the production of adhesives that exhibit adhesive properties when wetted, and can be used in the chemical industry in the manufacture of adhesive tapes, labels, etc. A glue is known that includes urea formaldehyde resin, neoprene latex and alkali metal silicate t. The adhesive causes warping and shrinkage of the paper when applied, requires the use of pressure when gluing. The closest to the proposed technical essence and the achieved result is water-activated glue, including urea formaldehyde resin, 25% aqueous plant: ammonia thief, dextrin, glycerin, caprolactam and kaolin 2. The known glue does not require the use of pressure during gluing, however, when applied to paper and dried, causes warping of the substrate and has a long setting time after wetting. The purpose of the invention is to reduce the warping of the paper substrate and the setting time after moistening. The goal is achieved by that. This water-activating glue, which includes Chevine formaldehyde resin, a 25% aqueous solution of ammonia, dextrin and glycerin, also contains butadiene {junior latex, having a pH of 9.6-12.5, and sulphite-alcohol bard in the following ratio of components, weight. %: Urea formaldehyde tl, 00-97.37 25% aqueous 0.5-10.00 ammonia solution Dextrin Glycerol 0.1-8.00 Butadiene. 1-16 styrene latex Sulphite 0, 03-10.00 alcohol bard In examples 1-8, the manufacture of adhesive compounds components are given in weight percent. Example 1. A 97.37 urea formaldehyde resin was charged to a stirred reactor and a 0.5-25% aqueous ammonia solution was added with stirring; 1.0 dextrin; 1.0 latex SCS-65GP; 0.03 sulfite alcohol stillage 0.1 glycerol. Stirring is carried out for 0.5-1.0 h at .18-25 C. Example 2. The glue according to example 1 is prepared with the introduction of 77.5 urea-formaldehyde resin, a 25% aqueous solution of ammonia; 8.0 dextrin; 7.0 latex SCS-65 GP {1.0 sulfite-alcohol bards; 2.5 glycerol. Stirring is carried out for 11, 5 hours at 18-25 C. Example 3. The glue of example 1 is obtained with the introduction of 10.025-nbgo aqueous ammonia solution, 15.0 dextrin, 16.0 latex SKS65 GP in 41.0 urea-formaldehyde resin ; 10.0 sulphite-alcohol bard 8.0 glycerin. Stirring is continued for 1.5-2.0 hours at 18-25 0. Example 4. The glue of example 1 is obtained with the introduction of 72.5 urea-formaldehyde resin, 0 25% aqueous ammonia, 8.0 dextrin into the reactor; 7.0 latex BS-50 6.0 sulfite-alcohol stillage, 2.5 glycerol. Stirring is carried out for 1.0-1.5 hours at 18-25 C. k, 0 25% aqueous solution of ammonia 8.0 dextrin, 7.0 latex BS-65 GPN 3.5 sulfite-alcohol stillage, 2.5 glycerin. Stirring is carried out for 1.0-1.5 hours at 18-25 C. 9 74 Example 6h The glue of example 1 is obtained when introduced into the reactor, 5 urea-formaldehyde resin; , 0 25% aqueous solution of ammonia, 8.0 dextrin; 1.0 sulfite alcohol bards; 2.5 glycerol. Stirring is carried out for 1.0-1.5 hours at 18-25 ° C. Example 7. The adhesive in Example 1 is prepared with 78.5 urea formaldehyde resin introduced into the reactor; , 0 25% aqueous ammonia, 8.0 dextrin; 7.0 latex SCS-65GP; 2.5 glycerol. Stirring is carried out 1.0-1.5 hours at. Example 8. The adhesive of example 1 is obtained with the introduction of urea-formaldehyde resin into the reactor 85.5; , 0 25% aqueous ammonia; 8.0 dextrin; 2.5 glycerol. Stirring is carried out for 1.0 h at 18-25 ° C. The resulting adhesive compositions are applied to a paper substrate and dried at 6090 ° C. The adhesive layer is moistened with water and applied to the surface to be glued without pressure. Glue compositions are tested on indicators; warping of the bonded surface (according to the VNIIHIMProekt method), seizure (according to TU 6-15-01-183-79. Water-activated synthetic adhesive). The table shows the test results. Examples 6-8 are the controls, example 9 is the prototype. Latex BS-50 has a pH of 10-11.8, latex BS-65GPN 9.6-11, SKS-65GP 11.0-12.5. It follows from the table that the glue according to examples 1-5 creates a slight warping of the paper base, it seizes faster after wetting. The application of the proposed glue will increase the productivity and quality of gluing.

Example

Warping paper surface (angle)

25

ten

22

eight

ten

62

60

59

(prototype)

Claims (2)

0 Claims of Invention A water-activatable adhesive, comprising urea-formaldehyde resin, 25% aqueous ammonia, dextrin and glycerin, different. jreM, that, in order to reduce warping and setting time after wetting, it additionally contains styrene latex, having a pH of 9.612, 5, and sulfite-alcoholic bard in the following ratio of components, wt.%: Urea-formaldehyde resin, 00-97,37 water The setting time (deposition on a paper substrate, followed by drying) after wetting when gluing the paper backing to paper (without pressure) with 25 10 18 9 12 50 55 60 30-35 30-90 0.5-10.0 ammonia solution Dextrin 1-15 Glycerol 0.1-8.0 Butadiene styrene N6 Latex Sulfite-alcohol bard 0.03-10.00 Sources of information taken into account during the examination 1. UK patent no. C 3 P, published. 1978 2. USSR author's certificate for application No. 2729959 / 23-05, C 09 J 3/16, 1979 (prototype).