Adhesive composition

FIELD: rubber industry, in particular chloroprene resin-based adhesive compositions.

SUBSTANCE: claimed composition contains nairitic adhesive, epoxy dianic resin and still waste from aniline production. Composition of present invention is useful in adhesion of vulcanized rubber surfaces or rubber and metal surfaces.

EFFECT: composition of improved adhesion strength.

3 tbl, 1 ex

 

The invention relates to adhesive compositions based on polychloroprene rubber and can be used in the rubber industry for bonding vulcanized rubber between itself and its attachment to the metal surface.

Known adhesive composition comprising a chloroprene rubber, thiuram, zinc oxide, as the resin product of co-condensation of phenol acetaldehyde and acetonaphthone and the solvent (USSR author's certificate No. 1579920, CL 09 J 111/00; Publ. 23.07.90). As solvent a mixture of ethyl acetate and petrol.

However, this adhesive composition does not provide a sufficiently high strength for bonding articles of vulcanized rubber.

Known adhesive composition comprising polychloroprene rubber, epoxy resin, low molecular weight on BNR rubber, tertiary amine, and a solvent (USSR author's certificate No. 685673, CL 08 L 11/00; Publ. 15.09.79).

However, this adhesive composition has a low strength bonding of rubber products based on various rubbers.

Known adhesive composition comprising polychloroprene rubber, butylbenzaldehyde resin, a copolymer of styrene and piperylene, rosin, esterified with glycerol; pine rosin, diphenylguanidine, 2,2-dimensionalised, zinc oxide, magnesium oxide, EO is anceschi solvent (U.S. Pat. 2028358 Russia, MKI609 J 111/00; Publ. 09.02.95).

However, this adhesive composition, although it has a similar composition, used to glue products from ferrites.

Closest to the invention to the technical essence is the glue NT (TU-033-45539771-2000), which includes (MASC): polychloroprene rubber Nairit HT - 100, butylbenzaldehyde resin K - 90, zinc oxide, 5 - magnesium oxide - 12, thiuram - 2 and an organic solvent - 800. As solvent a mixture of nefras and ethyl acetate in a percentage ratio of 50:50.

However, this adhesive composition (although it is widely used because of its low cost) does not provide a sufficiently high strength for bonding vulcanized rubber (attainable shear strength for bonding vulcanized rubber based on SKI-3 does not exceed 5,0 kN/cm2).

Task: development of the composition of the adhesive composition having increased strength in bonding vulcanized rubber between itself and its attachment to the metal surface.

The technical result is to increase the strength of the bonding vulcanized rubber between itself and its attachment to the metal surface.

The technical result is achieved in that the adhesive composition, comprising polychloroprene the Nairit rubber HT, the butylphenol-formaldehyde resin C, zinc oxide, magnesium oxide, thiuram and an organic solvent which is a mixture of atacamite and nefras as modifier contains epoxy Dianova resin ED-20 and distillation waste from the production of aniline (KPA), in the following ratio of components, parts by weight: polychloroprene rubber Nairit HT - 100, butylbenzaldehyde resin K - 90, zinc oxide, 5 - magnesium oxide - 12, thiuram - 2 specified organic solvent - 800, epoxy Dianova resin ED-20 - 18,9-2,7, distillation waste from the production of aniline (KPA) - 13,5-1,8.

Polychloroprene rubber plant HT (TU-601781-73) is the main film-forming adhesives-solutions.

Butylbenzaldehyde resin C (TU-6-10-1261-8).

Curing group: zinc oxide (zinc white), magnesium oxide (burnt magnesia GOST 844-79) was previously used in the adhesive compositions (Kardashov D.A., Petrov A.V. Polymer adhesives. M.: Chemistry, 1983).

Organic solvent: a mixture of ethyl acetate (GOST 8981-78) and nefras, GOST 443-76.

The modifier is a cheap material, KPA are waste resulting from the production of aniline (TR production of aniline CJSC "Orgsintez" , Volzhsky). KPA represent (parts by weight): aniline 15-18, cyclohexylamin - 0-10, toluidine (solvent) - 2-4, sodium hydroxide (filler) - 1-3, diphenylamine - 3-20, meta is Indiamen - 1-3, o-, n-aminophenol - 1-6, high molecular weight resinous substances (reagents interacting with rubber) - 6 : 45 a.m.

The adhesive composition is prepared as follows.

First prepare the rubber mixture (a mixture of plant HT, magnesium oxide, zinc oxide, turama) in the rubber mixer for 10 minutes, the temperature of the mixer gradually increases as you enter the components of the mixture) from the 50°C to 85°C. After discharging the mixture at a temperature of 105°To carry out listomania for 5 minutes Then heated rubber mixture with part of the solvent (about 0.1 h from the total amount of solvent) is clearesult. Remaining solvent together with other ingredients of the adhesive composition butylbenzaldehyde resin, epoxy Dianova resin ED-20, KPA load portions in clearesult as swelling rubber compound. Total time clemmesen is 4.5-5 hours, with the introduction of epoxy Dianova resin ED-20 KPA and can be carried out after preparation of the adhesive composition on the basis of the remaining components.

An example of the preparation of the adhesive composition.

In clearesult containing prepared in a known manner naritaweg glue NT comprising polychloroprene rubber Nairit NT, butylbenzaldehyde resin C, zinc oxide, magnesium oxide, tiara and an organic solvent, enter the calculated amount of modifier in the mass ratio of ED-20:KPA (50 to 70):(30-50), and stirred the contents for 5-10 minutes until a homogeneous mass.

Receive adhesive compositions 1-10, the compositions of which are given in table 1.

The adhesive is a light-brown liquid. Adhesive tech, well-applied to the surface of rubber and metal.

Have been investigated by various ratios of ED-20:KPA (table 2).

The stated limits of the components included in the composition of the modifier ED-20 18,9-2,7; KPA 13,5-1,8, due to the fact that when you increase or decrease the indicated dosages bond strength when bonding is reduced.

It is established that the optimal mass ratio between the epoxy Dianova resin ED-20 KPA and is 60:40, with the introduction which provided the best results. Comparative tests of strength properties of adhesives in all variants of the claimed composition and the prototype for bonding vulcanized rubber based on SKI-3 are given in table 2. For the comparative tests was prepared with 10 versions of the songs (by the method described in the example) and the composition of the prototype presented in table 1. The proposed composition was studied on the adhesion strength shear achieved through keeping under load of 2 kg at room Tempe is the atur (20° (C) within 24 hours. The data presented in table 2, which shows that best results are obtained when using the composition 2.

Further studies were used composition 2.

Testing of adhesive compositions was carried out by bonding the samples of vulcanized rubber based on SKI-3, a qualified electronic signature certificate, SKN among themselves, and when attaching rubber-based SKI-3 to 3. Adhesion shear was determined on a tensile testing machine MPC-250 (GOST 16971-71). Technology pasting the following samples. One-time application of the prepared adhesive to the prepared surface, drying the adhesive film at room temperature (20°C)drying the adhesive film for 5 minutes, after which he made a tight pressing of the bonding surfaces.

Comparative tests of the strength properties of composition 2 and the prototype are presented in table 3.

As can be seen from table 3, the proposed adhesive composition provides an increase in strength properties of adhesive joints in comparison with the prototype. So the strength of the glue line shear bonding vulcanized rubber based on SKI-3 prototype is 5.0 kgf/cm2and with the use of the modifier of 9.9 kgf/cm2.

Thus, as can be seen from table 3, when combined in the proposed epoxy adhesive compositions Dianova the resin ED-20 KPA and in the specified proportions can improve the strength of bonding of the articles of vulcanised rubber other on the basis of various rubbers and at its attachment to the metal surface, due to the participation of this modifier in improving the adhesion properties of the adhesive.

We found that the reason for increasing the adhesion performance of the adhesive is not only an increase in the concentration of the polar groups with the introduction of the modifier, but the formation of additional chemical bonds in the interaction of aminecontaining modifier with movable allylic chlorine atoms in macromolecules chloroprene rubber. Which leads to an increase of the density of a spatial grid and, apparently, to the hardening of the adhesive film.

Table 2
The ratio of ED-20:KPA, massThe indicator for the composition
60:4070:3050:50The prototype NC
Load shear (kgf/cm212345678910
24 hoursthe 9.79,97,77,56,67,97,07,9 7,47,15,0
Table 3
Load shear (kgf/cm2The indicator for the composition
The prototype NCOffer
SKI-3 - Article 34,1a 4.9
ski-35,09,9
qualified electronic signature certificate9,910,5
SKN4,66,5

Technical and economic effect, resulting from the application of the adhesive compositions is that its use can significantly improve the quality fastening products, of vulcanised rubber other on the basis of various rubbers and at its attachment to the metal surface to improve the technological parameters of the bonding process. In addition, its use allows the use of by-product (waste) petrochemical production (aniline).

The adhesive composition comprising polychloroprene rubber Nairit NT, butylbenzaldehyde resin 101, thiuram, zinc oxide, oxide MAGN what I an organic solvent which is a mixture of ethyl acetate and nefras, characterized in that it further comprises as a modifier of epoxy Dianova resin ED-20 and distillation waste from the production of aniline in the following ratio, wt. including:

Polychloroprene rubber Nairit NT 100

Butylbenzaldehyde resin 101 90

Thiuram 2

Zinc oxide 5

Magnesium oxide 12

Organic solvent 800

Epoxy Dianova resin ED-20 2,7-18,9

Distillation waste from the production of aniline from 1.8 to 13.5



 

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FIELD: rubber industry, in particular chloroprene resin-based adhesive compositions.

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3 tbl, 1 ex

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EFFECT: utilization of petrochemical process waste - aniline.

4 tbl, 1 ex

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