RU2393191C1 - Adhesive composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to adhesive compositions based on chloroprene rubber and can be used in the rubber industry when gluing together vulcanised rubber. The adhesive composition contains polychloroprene rubber nairit NT, butylphenolformaldehyde resin 101 K, thiuram, zinc oxide, magnesium oxide, a modifier and an organic solvent which is a mixture of ethylacetate and petroleum solvent. The modifier used is trichloroethylphosphate or trichloropropylphosphate. Components of the composition are in the following ratio in pts. wt: polychloroprene rubber nairit NT - 100.0, butylphenolformaldehyde resin 101 K - 90.0, zinc oxide - 5.0, magnesium oxide - 12.0, thiuram - 2.0, said organic solvent - 800.0, said modifier - 0.5-10.0.

EFFECT: invention increases strength when gluing together vulcanised rubber based on different types of rubber.

2 tbl, 1 ex

Description

The invention relates to adhesive compositions based on polychloroprene rubber and can be used in the rubber industry for bonding vulcanized rubbers based on various rubbers to each other.

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 a solvent (USSR copyright certificate No. 1579920, class C09J 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 (US 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.

Closest to the invention in technical essence is adhesive 88HT (TU2252-033-45539771-2000), which includes (parts by weight): polychloroprene rubber nairit NT 100.0, butylphenol formaldehyde resin 101K 90.0, zinc oxide 5, 0, magnesium oxide 12.0, thiuram 2.0 and an organic solvent of 800.0. As a solvent, a mixture of nephras and ethyl acetate in a percentage ratio of 50:50 is used.

However, the specified adhesive composition (although it is widely used because of its low cost) does not provide a sufficiently high strength when bonding vulcanized rubber (the achieved shear strength when bonding vulcanized rubber based on polyisoprene rubber (SKI-3) does not exceed 0.61 MPa )

Objective: the development of the composition of the adhesive composition with increased strength when bonding vulcanized rubbers based on various rubbers with each other and fire resistance.

The technical result is to increase the strength when bonding vulcanized rubbers based on various rubbers with each other.

The technical result achieved is achieved by the fact that the adhesive composition including polychloroprene rubber Nairit NT, butylphenol formaldehyde resin 101K, thiuram, zinc oxide, magnesium oxide, an organic solvent, which is a mixture of ethyl acetate and nephras, additionally contains, as a modifier, trichloroethyl phosphate or trichloropropyl component wt. h: polychloroprene rubber nairit NT 100,0, butylphenol formaldehyde resin 101K 90,0, thiuram 2.0, zinc oxide 5.0, magnesium oxide 12.0, the specified organic solvent 800.0, the specified modifier 0.5-10, 0.

Polychloroprene rubber nairit NT (TU-601781-73) is the main film-forming in adhesive adhesives.

Butylphenol formaldehyde resin 101K (TU-60004691277193-97).

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

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

Trichloroethyl phosphate (TU 2493-319-05763441-2000) is used as a plasticizer in the production of nitrolinoleum, as a flame retardant in compositions based on cellulose acetate, polyurethane foams.

Trichloropropyl phosphate (TU 2493-320-05763441-2000) is used as a flame retardant (extinguishing agent) in the manufacture of cable plasticizers, artificial leathers, paints and varnishes, linoleum, adhesive tape, film films, polyurethane foams.

When trichloroethyl phosphate and trichloropropyl phosphate are used as a modifier, the adhesive properties of the adhesive composition and the fire resistance of the adhesive film are significantly increased.

The adhesive composition is prepared as follows.

First, a rubber mixture (a mixture of Nairite NT, magnesium oxide, zinc oxide, thiuram) is prepared in a rubber mixer for 10 minutes, while the temperature of the mixer gradually rises (as the components of the mixture are introduced) from 50 ° C to 85 ° C. After unloading the mixture at a temperature of 105 ° C, it is paged for 5 minutes. Then the heated rubber mixture with a part of the solvent (about 0.1 part of the total amount of solvent) is loaded into the glue mixer. The remaining amount of solvent along with other ingredients of the adhesive composition with butylphenol formaldehyde resin indicated by the modifier is loaded in portions into the adhesive mixer as the rubber mixture swells. The total adhesive mixing time is 4.5-5 hours, while the introduction of the specified modifier can be carried out after preparation of the adhesive composition based on the remaining components.

An example of the preparation of the adhesive composition. Into a glue mixer containing 88HT nairite glue prepared in a known manner (TU-2252-033-45539771-2000), including polychloroprene rubber Nairit NT, 101K butylphenol formaldehyde resin, thiuram, zinc oxide, magnesium oxide and an organic solvent, the calculated amount is introduced using a modifier and mix the contents of 5-10 minutes until a homogeneous mass.

Get the adhesive composition 1-7, the compositions of which are shown in table 1.

Glue is a beige liquid. The glue is technological, it is well applied to the surface of rubber.

The stated limits of the specified modifier of 0.5-10.0 due to the fact that with an increase or decrease in these dosages, the adhesive strength during bonding decreases. In addition, with a decrease in the indicated dosages, the fire resistance of the adhesive composition decreases, as can be seen from table 2.

It was found that the most optimal modifier content is 1.0 and 3.0, 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 rubber based on polyisoprene rubber (SKI-3), ethylene propylene rubber (SKEPT-40), butadiene nitrile rubber (SKN-18) and chloroprene rubber (Neoprene) are given in table 2. For comparative tests were prepared 7 compositions and a composition of the prototype, the compositions of which are shown in table 1. The proposed composition was tested for adhesive shear strength, up to TIGA upon standing under the 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 the composition 1, 2, 4 and 6.

Shear adhesion was determined using an MPC-250 tensile testing machine (RTM 1.2.126-88). The technology for bonding samples is as follows. One-time application of the prepared glue on the prepared surface, drying of the adhesive film at room temperature (20 ° C) for 1-2 minutes, after which the adhesive surfaces were tightly pressed.

As can be seen from table 2, the proposed adhesive compositions provide an increase in the strength properties of adhesive joints in comparison with the prototype. So the shear strength of the adhesive joint when bonding vulcanized rubber based on SKEPT-40 according to the prototype is 0.99 MPa, and using the proposed modifier 1.83 MPa.

Thus, as can be seen from table 2, when using the specified modifier in the proposed adhesive composition, the specified strength increases when bonding vulcanized rubber products 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 the adhesive performance of adhesive compositions is not only an increase in the concentration of polar groups when this modifier is introduced into the composition, but also the formation of additional chemical bonds during the interaction of the phosphorus-containing modifier with mobile allylic chlorine atoms in the polychloroprene rubber macromolecules, which contributes to an increase in the mobility of the macromolecule and its deeper diffusion deep into the bonded material.

Table 1 Component The content of components in the composition, parts by weight one 2 3 four 5 6 7 Prototype adhesive 88NT Polychloroprene rubber Nairit NT 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 Butylphenol formaldehyde resin 101K 90.0 90.0 90.0 90.0 90.0 90.0 90.0 90.0 Tiuram 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Zinc oxide 5,0 5,0 5,0 5,0 5,0 5,0 5,0 5,0 Magnesium oxide 12.0 12.0 12.0 12.0 12.0 12.0 12.0 12.0 Organic solvent (a mixture of ethyl acetate and nefras in a percentage of 50:50) 800,0 800,0 800,0 800,0 800,0 800,0 800,0 800,0 Trichloroethyl phosphate 0.5 1,0 5,0 10.0 - - - - Trichloropropyl phosphate - - - - 1,0 3.0 5,0 -

table 2 Substrate Type Metric for composition one 2 3 four 5 6 7 Prototype adhesive 88NT Shear Strength, MPa SKI-3 0.95 0.84 0.93 0.86 0.72 0.82 0.78 0.61 SKEPT-40 1.31 1.83 1.12 1,04 1.40 1.17 1.43 0.99 SKN-18 0.83 1.12 1.25 1.36 0.88 1.12 0.95 0.46 Neoprene 1.32 1,60 1.00 1.17 1.10 1,62 0.97 0.73 Fire resistance of the adhesive composition - s / fade out s / fade out s / fade out s / fade out s / fade out s / fade out s / fade out burns

The technical and economic effect obtained from the use of the adhesive composition is that its application can significantly improve the quality of fastening of vulcanized rubber products based on various rubbers, and increase the fire resistance of the adhesive composition.

Claims (1)

An adhesive composition comprising polychloroprene rubber Nairit NT, butylphenol formaldehyde resin 101 K, thiuram, zinc oxide, magnesium oxide, an organic solvent, which is a mixture of ethyl acetate and nephras, characterized in that it additionally contains trichloroethyl phosphate or trichloropropyl as a modifier, parts by weight:
Polychloroprene rubber Nairit NT 100.0 Butylphenol formaldehyde resin 101K 90.0 Tiuram 2.0 Zinc oxide 5,0 Magnesium oxide 12.0 Specified Organic Solvent 800,0 The specified modifier 0.5-10.0