RU2322470C1 - Gluing composition and self-gluing material comprising thereof - Google Patents

Abstract

FIELD: gluing materials.

SUBSTANCE: invention relates to gluing compositions of constant stickiness and self-gluing materials based on aluminum foil, polymeric films and other backings designated for exploitation aircraft technique, automobile manufacture, ship building and others fields of technique at temperature from -60°C to +80°C. Proposed composition comprises isoprene rubber-3,4-polyisoprene rubber of molecular mass 120000-240000 Da with the content of vinyl links 83-88%, vaseline oil or low-molecular polybutadiene as a plasticizing agent, terpene-phenolic resin as an adhesion additive, and nefras as a solvent. Invention provides enhancing cohesion strength - resistance to dynamic and static shift - and adhesion - strength at separating to aluminum foil and aluminum alloys of the claimed composition, and enhancing shift strength and separating self-gluing material.

EFFECT: improved and valuable technical properties of composition.

3 cl, 3 tbl, 3 ex

Description

The present invention relates to the field of adhesive compositions with constant stickiness and self-adhesive materials based on aluminum foil, polymer films and other substrates intended for use at temperatures from -60 to + 80 ° C in aircraft, automotive, shipbuilding and other technical fields.

Known adhesive composition for adhesive tapes, including natural rubber, stickiness agent, plasticizers (liquid paraffin, rosin ester, lanolin), filler, solvent (ed. St. USSR No. 730783).

A disadvantage of the known adhesive composition is low adhesion to metal surfaces due to the presence of a large number of plasticizers in it, which does not allow its use in aircraft.

Known layered decorative material, including a metallized polymer film, an adhesive adhesive layer based on acrylic dispersion and release paper, and between the metallized polymer film and the adhesive layer is an additional layer of alcohol-soluble resins (RF patent No. 2134200).

A disadvantage of the known material are low strength properties.

The closest analogue of the adhesive composition adopted for the prototype is an adhesive for adhesive tapes on a foam substrate, including, wt.%:

Isoprene rubber 6.4-11.6 Chloroprene rubber 2.1-3.9 Adhesive additive 4.7-8.5 Plasticizer 4.0-6.3 Zinc oxide 0.35-0.6 White soot 0.3-0.5 Altax 0.2-0.3 Hexamethylenetetramine 0.1-0.5 Hydrazine hydrochloride 0.05-0.15 Solvent rest

(ed. certificate of the USSR No. 1165701).

The disadvantage of the prototype is the low cohesive strength and low adhesion to metal surfaces.

The closest analogue of the self-adhesive material adopted for the prototype is a multilayer material containing an aluminum foil base with a protective decorative layer of titanium nitride and a sticky layer made of natural rubber, covered with release paper (RF patent No. 2141406).

The disadvantage of the self-adhesive material of the prototype is the low indicators of shear and peeling strength.

The technical task of the invention is to increase cohesive strength (resistance to dynamic and static shear) and adhesion (peeling strength) to aluminum foil and aluminum alloys of the inventive adhesive composition, as well as to increase the shear strength and peeling of self-adhesive material.

To solve the technical problem proposed:

an adhesive composition comprising isoprene rubber, a plasticizer, an adhesive additive and a solvent which contains 3,4-polyisoprene rubber with a mol. m. 120-240 thousand and a vinyl content of 83-88%, as a plasticizer - liquid paraffin or low molecular weight polybutadiene, as an adhesive additive - terphenol resin, and as a solvent - nefras in the following ratio, wt.h .:

specified 3,4-polyisoprene rubber one hundred specified plasticizer 5-10 terphenol resin 5-10 nefras 350-525

self-adhesive material, comprising a base with an adhesive layer applied thereon and release paper, which contains the specified adhesive composition as an adhesive layer with a ratio of the base: adhesive layer = 1: (0.25-1).

As a basis, the self-adhesive material may contain aluminum foil, a polymer film or fiberglass.

The proposed adhesive composition and self-adhesive material combine high cohesive (dynamic and static shear) and adhesive (peeling) properties, which is achieved by the qualitative and quantitative composition of the components of the claimed materials.

As 3,4-polyisoprene rubber can be used elastomers with different molecular weights, but the best technical result is achieved when using elastomers with mol. m. 120-240 thousand according to TU 2294-108-00151963. 3,4-polyisoprene rubber belongs to the group of polymers with a high content of vinyl units (83-88%), which along with the structure determines its high intrinsic tack, good film-forming properties, cohesive strength and high adhesion to a variety of materials (metals, glass, polymer films, fabrics, etc.). In addition, the structure of this rubber provides high vibration damping properties of materials based on it, which allows their use in conditions of increased vibration.

As an adhesive additive, the claimed composition contains terphenol resin with a softening temperature of 100-120 ° C according to TU 6-05-211-895.

As a plasticizer in the inventive adhesive composition, it is most preferable to use liquid paraffin (GOST 1840) or low molecular weight polybutadiene (TU 38.103570), which can improve the technological and operational properties of the adhesive composition and increase its viability.

As the basis of the proposed self-adhesive material, aluminum foil 50-80 mm thick in accordance with GOST 745, GOST 718, fiberglass in accordance with TU 1-92-82-83, nonwoven lavsan fabric, polymer polyolefin films (polyethylene and polypropylene) in accordance with GOST 10354 can be used. Can also be used foil with a lacquered coating on its surface or a system of coatings. In this case, the adhesive composition is applied to the side not protected by paintwork.

Examples of implementation

Example 1

To 100 parts by weight 3,4-polyisoprene rubber with 83% vinyl units was added 350 wt.h. nefras and mixed until completely dissolved. To the resulting solution was added 5 wt.h. terphenol resin, was stirred and kept for 12 hours. Then, 7 parts by weight of the mixture were introduced. liquid paraffin and thoroughly mixed to obtain an adhesive composition.

The manufacturing technology of the adhesive composition according to examples 2,3 is similar to example 1.

The compositions of the inventive adhesive compositions and prototype (in parts by weight) are shown in table 1.

Table 1 Name of components The composition according to examples, parts by weight Prototype one 2 3 3,4-polyisoprene rubber one hundred m.m. 120 thousand with 83% of vinyl links one hundred - - m.m. 170 thousand with 85% of vinyl links - one hundred - m.m. 240 thousand from 88% of vinyl links - - one hundred Adhesive Additive - Terphenophenol Resin 5 10 7 15,5 Plasticizer 56.0 Vaseline oil 7 - - low molecular weight polybutadiene - 5 10 Solvent- nefras 350 400 525 910 Chloroprene rubber - - - 33.3 Zinc oxide - - - 6.0 White soot - - - 4.2 Altax - - - 3.0 Hexamethylenetetramine - - - 2,4 Hydrazine hydrochloride - - - 1,2

To study the properties, self-adhesive materials were obtained using adhesive compositions according to examples 1-3 and aluminum foil as the basis, from which adhesive compounds were then made using samples of aluminum alloy D-16.

A self-adhesive material was prepared as follows: the adhesive composition was applied to the foil, dried and covered with release paper. Then, the finished self-adhesive material, after removing the release paper, was applied to the prepared metal surface and rolled up with a roller.

Table 2 shows the properties of adhesive joints made according to the invention in comparison with the prototype.

The tensile strength at dynamic shear was determined according to GOST 14760, the resistance to static shear - according to ASTM D-3456 as the resistance of the adhesive to the action of a static load of 0.2 kg over time. In this case, a sliding of the applied self-adhesive material was observed. The bonding area was 6 cm ² . The tests were carried out in the temperature range of -60 - + 80 ° C.

table 2 Name of properties Indicators for Examples Prototype - adhesive composition Prototype - Laminated Material one 2 3 Peeling strength, N / cm 6.1 5.9 6.5 2,5 2.0-5.0 Shear strength, kPa 640 660 610 200 50-100 Resistance to static shear - sliding, mm, for 100 hours one 0 3 fifteen twenty

The ratio of the layers is the basis: the sticky layer: example 1 - 1: 1, example 2 - 1: 0.5, example 3 - 1: 0.25.

The properties of adhesive compounds in which a polyolefin film and fiberglass were used as the basis of the self-adhesive material are shown in Table 3. The adhesive composition of Example 2 of Table 1 was used as the adhesive layer, with a base: adhesive layer ratio of 1: 0.5, at using a polyolefin film and 1: 1 - when using fiberglass.

Table 3 Name of properties The adhesive composition according to example 2 Prototype Polyolefin film Fiberglass Polyolefin film Fiberglass Peeling strength, N / cm 3.8 4,5 1,5 1.8 Shear strength, kPa 350 500 one hundred 180 Resistance to static shear - sliding, mm, for 100 hours 5 3 25 twenty

From the data of tables 2 and 3 it follows that the use of the inventive adhesive composition in the composition of a self-adhesive material based on various substrates can increase shear strength (dynamic shear) by 3 times, when peeling - by 1.5-3 times, resistance to static shear - by 5-10 times. In addition, the inventive material has high damping properties, which allows it to be used in conditions of increased vibration.

Thus, the use of the inventive adhesive composition and self-adhesive material containing it, will reduce the complexity and energy consumption during the repair work on the surface of the airframe of aircraft and other structures and makes it possible to carry out repairs in the field using environmentally friendly technology.

Claims (3)

1. An adhesive composition comprising isoprene rubber, a plasticizer, an adhesive additive and a solvent, characterized in that it contains 3,4-polyisoprene rubber with a mol.m. as isoprene rubber 120-240 thousand and a vinyl content of 83-88%, as a plasticizer - petrolatum oil or low molecular weight polybutadiene, as an adhesive additive - terphenolic resin, and as a solvent - nefras in the following ratio, wt.h .: 3 , 4-polyisoprene rubber 100, said plasticizer 5-10, terphenolic resin 5-10, nefras 350-525. 2. Self-adhesive material, including a base with a sticky layer applied on it and release paper, characterized in that as the sticky layer it contains the adhesive composition according to claim 1 with a ratio of the base: sticky layer = 1: (0, 25-1) . 3. The self-adhesive material according to claim 2, characterized in that it contains aluminum foil, a polymer film or fiberglass as a basis.