DE1719124C3 - Aqueous adhesive dispersion based on a vinyl copolymer - Google Patents

Description

on the other hand, a one-sided adhesive application may also be sufficient. This can be done with a brush, glue comb, glue roller or a glue application machine or any other suitable device.

After a possibly short drying time, which, among other things, depends on the absorbency of the Depending on the materials, the bond is put together under low pressure. This pressure, through a screw clamp or heated press that causes the adhesive to set more quickly, is maintained with an absolutely secure joint until the bond strengthens is sufficient to withstand the stresses exerted by the bonded materials without separation to resist.

The adhesives according to the invention are suitable for bonding numerous materials, e.g. B. of paper, Cardboard, textiles, leather otlsr for applying plastic films, for example made of polyvinyl chloride, Polyethylene, cellulose acetate butyrate on suitable porous fabrics, for example on wood, Cardboard, paper, leather, textiles are suitable, in particular they can be used with advantage for surface and lath wood gluing, for veneering as well as for the production of foils, tenon or tenon joints, like them are to be used in the manufacture of furniture, doors and windows.

The percentages given in the examples are percentages by weight, unless otherwise stated.

Examples 1 to 5

The copolymer dispersions used for Examples 1 to 5 were prepared according to Example 1 of German patent application P 17 20 593.5 by emulsion copolymerization of ethylene with Vinyl acetate, vinyl chloride and cyclohexyl maleic acid in an aqueous medium. By concentrating the solids content of the dispersions was increased to about 50 to 60 percent by weight. The analytical The composition of the copolymers is given in the table below.

With these dispersions, beech wood / beech wood bonds were carried out on the basis of DIN 53 254. The surfaces to be bonded were first roughened with 100 grit sandpaper, from Cleaned the sanding dust, primed with the above dispersions and coated again after 30 minutes. To After joining, the bonds were pressed with a screw clamp for 24 hours.

Prior to determining their aufgefühiten in the accompanying table bond strength in the tensile test according to DIN 53 254, the bonds were first for 3 days under standard climatic conditions (20 ⁰ C, 65% relative humidity)

ao and then stored in water for 24 hours.

Comparative examples

Adhesives carried out correspondingly with a commercially available polyvinyl acetate dispersion (comparative example 1) showed a bond strength of 0 kp / cm ² after immersion in water. Comparative example 2 with a commercially available ethylene / vinyl acetate copolymer dispersion also gave a bond strength of 0 kp / cm ² after immersion in water.

A comparison of Examples 1 to 5 with the comparative examples in the following table shows the superiority of the adhesives according to the invention.

example Fixed salary Vinyl acetate Vinyl chloride Ethylene Maleic acid Bond strength cyclohexyl after one day half-ester Water storage at 20 ° C C /.) (Vo) (· / ·) (V.) (Vo) (kp / cm ^! ) 1 53.7 30.2 40.1 16.9 3.8 25th 2 62.0 38.8 41.7 15.7 3.8 10 3 61.0 32.0 41.5 17.5 9 11th 4th 49.5 18.4 61.3 15.6 4.7 4th 5 57.7 11.8 55.9 29.3 3 4th Comparative example 1 49.3 100 - 0 Comparative example 2 50.5 71.4 - 28.6 - 0

Claims (1)

ester, vinyl acetate and vinyl chloride must be built up patent claim, and within certain percentage Compositions to be used as adhesives This document does not disclose that an adhesive can be made up of an aqueous dispersion Derive persion on the basis of a vinyl copolymer 5. and, if necessary, customary plasticizers, United States-Pb 3-15 6/8 lerpo.y- thickeners and stretchers as well as fillers made of ethylene (at least 65 percent by weight), substances, characterized in that vinyl esters and (methacrylic acid (0.0 Ibis 10 Gedas Copolymer from 8 to 3G weight percent weight percent), which among other things as a hot melt adhesive Ethylene, 2 to 15 percent by weight of a hemi-io should be used. In contrast, geesters an α, / J-unsaturated dicarboxylic acid, measured in the present application, aqueous dispersions its alcohol component up to 8 carbon atoms of copolymers from 8 to 30 percent by weight contains and 55 to 90 percent by weight of an ethylene, 2 to 15 percent by weight of a half ester Mixture of vinyl chloride and a vinyl ester of maleic acid and 55 to 90 percent by weight of one a saturated carboxylic acid up to 18 C- 15 mixture of vinyl ester and vinyl chloride as adhesive atoms, the proportion of vinyl ester used in the agent that differs from the terpolymers Sum of vinyl ester and vinyl chloride 10 to US Pat. No. 32 15 678 with respect to the monomers from 60% can amount is built up. choice and the percentage composition essential differ. A particular advantage of the 2o inventive adhesive lies in its applicability in the form of the aqueous dispersions and in the possible use at room temperatures. It is known that adhesives based on aqueous A reference how to use the copolymers of the US patent plastic dispersion. Compared to writing must be modified in order to be used as aqueous adhesives on a different basis, for. B. rubber or dispersion adhesive to be suitable, can not be found in the geKunststoff-solutions in organic solvents, mentioned state of the art,
such dispersion adhesives have significant subject matter of the invention is an adhesive advantage in that they usually contain, inter alia, a high proportion of an aqueous dispersion based on an active adhesive substance and a vinyl copolymer and possibly also no flammable and harmful 30 plasticizers, thickeners and Stretching fabrics on white:; n. agents and fillers, characterized in that the copolymer of 8 to 30 percent by weight of adhesives based on aqueous polyvinyl acetate dis-ethylene, 2 to 15 percent by weight of a half ester persions for bonding numerous materials, such. B. a *, / ^ - unsaturated dicarboxylic acid, the alcohol of paper, cardboard, textiles, leather and plastics, 35 contains up to 8 carbon atoms and 55 is used. Such adhesives are used with up to 90 percent by weight of a mixture of vinyl, especially in the woodworking industry for chloride and a vinyl ester of a saturated gluing of car surfaces or ply wood, for veneering with up to 18 carbon atoms, with the proportion as well as for the production of dowel, Zinc or vinyl esters based on the sum of vinyl ester and vinyl pin compounds, as they can amount to 10 to 60% in the production of chloride.
of furniture, doors and windows. The particular advantage of the adhesives produced with the adhesives according to the invention has recently been found for these applications, dispersions of ethylene-vinyl acetate copolymers is that they are excellent in water resistance. All of these wedge have adhesives, even though they are made from aqueous dispersions, which are applied by Bean. high stress under normal conditions. Have strength. esters with 1 to 8 carbon atoms in the alcohol However, a disadvantage is a nente in many applications. Insufficient water resistance of these bonds, the adhesive dispersions can in particular solid where these bonds to wood content between 20 to 70 percent by weight or otherwise in the open air of a strong waterway. Particularly good results are achieved are exposed to the effects. But also on others if the solids content is 45 to 65 percent by weight Areas, e.g. B. in the packaging industry results. often an unsatisfactory water resistance. To modify their properties, the ability of the bonds. 55 adhesives according to the invention, e.g. B. Dibutylphtha- CA-PS 7 30 748 also discloses aqueous emulsions or tricresyl phosphate as plasticizers for the Sions of copolymers made of ethylene, vinyl adhesive layers, polyvinyl alcohol or carboxymechloride and a half-ester of maleic acid thal cellulose for thickening, barite, kaolin, Knows, according to p. 5, lines 1 and 2, of this document chalk or wood flour as a filler or extender can also be used in the adhesive sector, 60 can be added. If there is enough adhesive in the dried-up state, the inven- show effects. The dispersion adhesives according to the emulsion are preferably applied to the Sions for the production of coatings and in-adhesive, previously thoroughly cleaned and embossed or the precipitated polymers for the production of surfaces possibly pretreated by roughening exposed to plastics. 65 brings. Occasionally, especially with stronger suckers According to the invention of the present registrable materials, it is expedient to use the adhesive, that the dispersions of copolymers of surfaces with the adhesive before applying the proper To prime special monomers ethylene maleic acid semi- borrowed adhesive. In some cases