RU2415898C2 - Adhesive composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: adhesive composition contains chlorine-containing rubber and an organic solvent. The chlorine-containing rubber used is chlorosulphonated polyethylene and the organic solvent is toluene. The composition also contains a borate methyl phosphite modifier. Components of the composition are in the following ratio, pts. wt: chlorosulphonated polyethylene 20, toluene 80, borate methyl phosphite 0.1-0.5.

EFFECT: simple formulation of the adhesive composition, high strength when gluing vulcanised rubber with metal.

2 tbl, 1 ex

Description

The invention relates to adhesive compositions based on chlorine-containing rubber, and can be used in the rubber industry for bonding vulcanized rubber to metal.

Known adhesive composition comprising chloroprene rubber, thiuram, zinc oxide, as a resin, the product of the joint condensation of phenol of acetaldehyde and acetanaphthene and solvent (USSR Author's Certificate No. 1579920, class 099 111/00; Publ. 23.07.90). As a solvent, a mixture of ethyl acetate and gasoline is used.

However, this adhesive composition does not provide a sufficiently high strength when bonding products from vulcanized rubber.

A known adhesive composition comprising polychloroprene rubber, epoxy resin, low molecular weight butadiene nitrile rubber, tertiary amine, solvent (USSR Author's Certificate No. 685673, class C08L 11/00; publ. 15.09.79).

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

Known adhesive composition comprising polychloroprene rubber, butylphenol formaldehyde resin, a copolymer of styrene and piperylene, rosin esterified with glycerol; pine rosin, diphenylguanidine, 2,2-dibenzothiazoldisulfide, zinc oxide, magnesium oxide, organic solvent (Pat. 2028358 Russia, MKI ⁶ C09J 111/00; publ. 09.02.95).

However, the specified adhesive composition, although it has a similar composition, is intended for bonding products from ferrites.

Known adhesive 88CA (TU 381051760-89), which includes (parts by weight): polychloroprene rubber Nairit DP - 90.0, butylphenol formaldehyde resin 101 K - 90.0, zinc oxide - 5.0, magnesium oxide - 11 , 0, water - 3.0, organic solvent - 800.0. A mixture of nefras and ethyl acetate in a percentage ratio of 50:50 is used as an organic solvent.

However, this adhesive composition has a complex formulation and production technology.

Known adhesive 88NP (TU 38.105.540-85), which includes (parts by weight): polychloroprene rubber neoprene AC, butylphenol formaldehyde resin 101 K, zinc oxide, magnesium oxide, water and an organic solvent, which is a mixture of ethyl acetate and nefras .

However, this adhesive composition has a complex formulation and production technology.

Closest to the invention in technical essence is adhesive 88NT (TU2252-033-45539771-2000), which includes (parts by weight): polychloroprene rubber nairit NT, butylphenol formaldehyde resin 101 K, zinc oxide, magnesium oxide, thiuram and organic a solvent that is a mixture of ethyl acetate and nefras.

However, the specified adhesive composition has a complex formulation and production technology.

Objective: development of the composition of the adhesive composition having a simple formulation and having increased strength when bonding vulcanized rubber with metal and fire resistance.

The technical result is to simplify the formulation of the adhesive composition, increase the strength when bonding vulcanized rubber with metal.

The technical result is achieved in that the adhesive composition comprising chlorine-containing rubber, an organic solvent, contains chlorosulfonated polyethylene as chlorine-containing rubber, toluene as an organic solvent and additionally contains methylphosphite borate modifier, in the following ratio, wt.h .: chlorosulfonated polyethylene - 20, toluene - 80, methyl phosphite borate - 0.1-0.5.

Chlorosulfonated polyethylene is the main film-forming in paint and varnish anticorrosive coatings (TU 6-55-9-90).

Toluene is an organic solvent (GOST 14710-78).

Methylphosphite borate is a viscous unpainted liquid, readily soluble in water, dimethylformamide, acetone, alcohols (US Pat. No. 2190697). Widely known as a combustion inhibitor.

When used as a modifier of the specified borate methylphosphite significantly increase the adhesive properties of the adhesive composition. As a result of the interaction of methylphosphite borate with chlorine atoms in the macromolecules of chlorosulfonated polyethylene, an increase in the concentration of polar groups occurs, which increases the strength when bonding vulcanized rubber to each other.

The adhesive composition is prepared as follows. First, a solution of chlorosulfonated polyethylene is prepared. Chlorosulfonated polyethylene and solvent are loaded into an adhesive mixer and mixed for 4.5 hours. Then, the specified modifier is loaded into the resulting solution. The total adhesive mixing time is 5 hours.

An example of the preparation of the adhesive composition. The calculated amount of modifier is introduced into the glue mixer containing the prepared solution of chlorosulfonated polyethylene, including chlorosulfonated polyethylene and toluene, and the contents are mixed for 5-10 minutes until a homogeneous mass is obtained.

Get the adhesive composition 1-3, the compositions of which are given in table 1. The glue is a clear beige color liquid. The glue is technological, it is well applied to the surface of rubber. Various contents of the specified modifier were investigated (Table 2).

The stated limits of the specified modifier of 0.1-0.5 are due to the fact that with an increase or decrease in these dosages, the adhesive strength during bonding decreases.

It was found that the most optimal content of the specified modifier is 0.3, with the introduction of which the best results were obtained. Comparative tests of the strength properties of adhesive compositions for all variants of the claimed composition and prototype when bonding vulcanized rubbers based on polyisoprene rubber (SKI-3), ethylene propylene rubber (SKEPT-40), butadiene nitrile rubber (SKN-18) are given in Table 2. For comparative tests, 3 variants of compositions were prepared (by the method described in the example) and the composition of the prototype presented in table 1.

The proposed composition was tested for adhesive strength with a uniform separation, achieved when kept under a load of 2 kg, at room temperature (20 ° C) for 24 hours. The fire resistance of the adhesive composition was determined by the method of determining resistance to burning (GOST 28157-89), by preliminary casting it on a flat glass surface and subsequent drying at room temperature for one day to a constant weight.

The data are presented in table 2, which shows that the best results were obtained using the composition of composition 2.

The proposed adhesive composition provides an increase in the strength properties of adhesive joints in comparison with the prototype. So, for example, the strength of the adhesive joint during tearing when bonding vulcanized rubber based on SKI-3 according to the prototype is 0.59 MPa, and using the proposed composition - 0, 84 MPa.

Strength at uniform separation from Art. 3 was determined in accordance with GOST 209-75 on an adhesive meter PSO-2.5 MG 4 (TU 4271-005-12585810-01). The technology for bonding samples is as follows. Twice applying the prepared glue to the prepared surface, drying the adhesive film at room temperature (20 ° C) for 5 minutes, after which tightly pressed the glued surfaces.

Thus, as can be seen from table 2, when using methyl phosphite borate in the proposed adhesive composition in the indicated amounts, it is possible to increase the strength when bonding products from vulcanized rubber based on various rubbers, which is due to the participation of this modifier in improving the adhesive properties of the adhesive.

We found that the reason for the increase in adhesive performance of the adhesive is not only an increase in the concentration of polar groups when introduced into the composition of the modifier, but also the formation of additional chemical bonds during the interaction of the phosphorus-containing modifier with chlorine atoms in the macromolecules of chlorosulfonated polyethylene. Which leads to hardening of the adhesive film.

Table 1 Component The content of components in the composition, parts by weight one 2 3 prototype Polychloroprene rubber Nairit NT - - - 90 Chlorosulfonated Polyethylene twenty twenty twenty - Butylphenol formaldehyde resin 101 K - - - 90 Zinc oxide - - - 5 Magnesium oxide - - - 12 Organic solvent (a mixture of ethyl acetate and nefras in a percentage of 50:50) - - - 800 Toluene 80 80 80 - Specified Methyl Phosphite Borate Modifier 0.1 0.3 0.5 -

table 2 Substrate Type Strength at uniform separation, MPa Metric for composition Prototype one 2 3 SKI-3 + Art. 3 0.83 0.84 0.74 0.59 SKEPT-40 + St.3 0.75 0.73 0.71 0.70 SKN-18 + Article 3 0.60 0.66 0.63 0.58 Fire resistance of the adhesive composition - s / fade out s / fade out s / fade out burns

The technical and economic effect obtained from the use of the adhesive composition consists in the fact that its application improves the quality of fastening of vulcanized rubber products based on various rubbers with metal, and increases the fire resistance of the adhesive composition.

Claims (1)

An adhesive composition comprising chlorine-containing rubber, an organic solvent, characterized in that it contains chlorosulfonated polyethylene as a chlorine-containing rubber, toluene as an organic solvent and further comprises a methyl phosphite borate modifier in the following ratio, wt.h .:
Chlorosulfonated Polyethylene twenty Toluene 80 Methyl Phosphite Borate 0.1-0.5