The adhesive composition

 

(57) Abstract:

The invention relates to the production of adhesive compositions based on polychloroprene rubbers used in the radio industry for bonding articles of ferrites. The invention improves the bond strength of ferrite products /pull/ to 8.3 kg/cm2after 72 h and to reduce the time of rejection through the use of a copolymer of styrene and piperylene with the content of the bound styrene 91 to 93 mol.% and additional content, pine rosin, rosin, esterified with glycerol to 40 wt.%, diphenylguanidine 2,2-dimensionalised, zinc oxide and oskido magnesium. The adhesive composition contains by weight.h.: polychloroprene rubber 100; butylbenzaldehyde resin 90 - 110, copolymerizable and piperylene 1 - 6; rosin, esterified with glycerol to 40 wt.%, 1 - 3; pine rosin 1 - 3; diphenylguanidine 0,5 - 1,5; 2,2-dimensionalised 1.5 to 2.5; zinc oxide 4 - 6; magnesium oxide 10 to 14; an organic solvent 300 - 700. table 2.

The invention relates to adhesive compositions based on polychloroprene rubbers and can be used in the radio industry, in particular for bonding articles of ferrites.

However, this adhesive composition (although it finds application in the radio industry for bonding ferrite cores for transformers) does not provide a sufficiently high strength for bonding articles of ferrites (achieved tensile strength for bonding ferrite does not exceed 7,1 kg/cm2). Besides this, the adhesive composition is relatively viscous (80-180 PZ at 20aboutC), making it difficult to ensure uniform wetting her at the bonding surface.

Closest to the invention to the technical essence and the achieved result is an adhesive composition comprising polychloroprene rubber butylbenzaldehyde resin, a copolymer of styrene and piperylene with the content of the bound styrene 60-80 mol.% and an organic solvent (USSR Author's certificate N 1399318, CL 09 J 3/12). As solvent a mixture of ethyl acetate and petrol. However, this adhesive, although showing a slightly higher strength when bonding products from ferrites (achieved tensile strength of 7.0 kg/cm2), but it is not large enough.

In addition, when the fast (within 72 h), what complicates the technology of bonding when using this glue.

The aim of the invention is to increase the strength of bonding of ferrite products and decrease the curing time.

This objective is achieved in that the adhesive composition comprising polychloroprene rubber, butylbenzaldehyde resin, a copolymer of styrene and piperylene, organic solvent as a copolymer of styrene and piperylene it contains a copolymer of styrene and piperylene with the content of the bound styrene 91-93 mol.%, rosin, esterified with glycerol to 40%, and pine rosin, diphenylguanidine, 2,2'-dibenzothiazoledisulphide, oxides of zinc and magnesium, with the following ratio of components, wt.h. Polychloroprene rubber 100 Butylformamide - Gena resin 90-110 Copolymer of styrene and p - perylene with content related Sterol-93 mol. % 1-6 Rosin esterified with glycerol to 40% 1-3 pine Rosin 1-3 Diphenylguanidine 0,5-1,5 2,2'-Dibenzothiazoledisulphide 1.5 to 2.5 zinc Oxide 4-6 magnesium Oxide 10-14 Organic solvent 300-700

Polychloroprene rubber Nairit (DP) - (TU-6-01-1319-85), or Nairit NT-N-(TU-601781-73) or neoprene (import) is the main film-forming adhesives-dissolve the Copolymer of styrene and piperylene General formula (C5H3)n(C8H8)mc content of the bound styrene 91-93 mol.% obtained by copolymerization of piperylene and styrene butyllithium catalyst and is a white amorphous mass, soluble in ethyl acetate and other organic solvents. The copolymer is a cheap substance, as piperylene by-product in the production of isoprene from isopentane. Synthesis of samples of a copolymer of styrene and piperylene with the content of the bound styrene 91-93 mol.% conducted according to the method described in a Positive decision on the application N 4333812/23-05 "Method of production of a copolymer of styrene with piperylene" (Published in the print media are not subject).

P R I m m e R. a Copolymer of styrene with piperylene containing 92 mol.% styrene is produced by polymerization of a mixture of styrene and piperylene (containing 92 mol. % styrene) in a hydrocarbon solvent. In purged with inert gas glass reactor, is injected at a temperature of reactor 11aboutC and stirring 500 ml of toluene, to 102.2 g of a mixture of monomers of styrene and piperylene that is 50% of the total amount of the mixture 205,9 g, prepared by mixing 195 g of styrene and 10.9 g of piperylene (styrene content in a mixture of 92 mol. % ). In the reactor is injected to 7.7 MT of the remaining amount of 103 g (50%) of a mixture of styrene and piperylene. The reaction mixture was kept for 30 min and then the temperature of the reactor jacket was adjusted to 30aboutWith and spend depolymerization within 2 hours the Polymerization cut short by the introduction of ethanol. After removal of the solvent receive 205,9 g of a copolymer of styrene with piperylene (100% output) with the content of 92 mol.% styrene (confirmed by GC and NMR spectra). The characteristic viscosity of the copolymer [] = 0,81.

Similarly performed the synthesis of other samples of a copolymer of styrene and piperylene using the appropriate quantities of the monomers.

Copolymers of styrene and piperylene with the content of the bound styrene 91-93 mol.% earlier in the adhesive compositions were not used.

Rosin, esterified with glycerol to 40% (THE 81-05-25-87) - previously not been used in the adhesive compositions used in the cable industry as an insulating material).

Pine rosin (GOST 19113-73) and vulcanizing group: zinc oxide (zinc white), magnesium oxide (burnt magnesia GOST 844-79), diphenylguanidine (TU - GOST 40-67), 2,2'-dimensionalised (altax) (GOST 70-85-75) was previously used in the adhesive compositions (Kardashov D. A., Petrova A. C. Polymer adhesives. the ina, (gasoline-solvent BR-1 GOST 443-76) in the ratio of the ethyl acetate 150-350 wt.h. and nefras (or gasoline) 150-350.

The adhesive composition is prepared as follows. First prepare the rubber mixture (a mixture of plant, altaxe, diphenylguanidine, of magnesium oxide in rubber mixer for 10 minutes, the temperature of the mixer shall not exceed 50aboutC. the Mixture is subjected to rolling for 5-6 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, zinc oxide, rosin, rosin esterified with glycerol, a copolymer of styrene and piperylene loaded portions in clearesult as swelling rubber compound. Total time clemmesen is 4.5-5 hours, with the introduction of rosin, esterified with glycerol, and copolymer of styrene and piperylene 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. Beginning in clearesult load 0.2 l of an organic solvent (ethyl acetate-petrol is Aqsa, 1 wt.h. diphenylguanidine and 12 wt.h. magnesium oxide) and stirred for 1.5 h; enter 0.3 l of solvent and load of 1.25 kg resin 101, 24 g of the copolymer with the content of 92 mol.% styrene, 24 g of pine rosin, 24 g of rosin, esterified with glycerol to 40% , and stirred for 0.7 hours; add 0.5 l of solvent, mix of 0.16 h and a load of 60 g of zinc oxide in suspension with the solvent (0.2 l), stirred for 0.3 hours, add 2 l of solvent, stirred for 0.3 h, 3 l stirred for 0.3 h) and 1.7 l and stirred for 1 h

The viscosity of the prepared adhesive compositions (determined by Brookfield) 20 P.

Receive adhesive composition 1 (see tab.1). Other (1-15) composition was obtained similarly using the appropriate quantities of the ingredients.

The test adhesive compositions were performed on a ferrite core transformers. The technology of bonding ferrite cores of transformers the following. One-time application of the prepared adhesive to the prepared surface (end faces) of the ferrite core, drying the adhesive film at room temperature (20aboutC) for 10 min, after which he produced a thick suffocating glued the ASS="ptx2">

For the comparative tests was prepared with 15 choices of songs (according to the method described in example 1) and the composition of the prototype presented in table. 1. The proposed composition was used to bond strength achieved during curing at room temperature (20aboutC) for 12, 24, 48 and 72 hours

Comparative tests of strength properties of adhesives for all options and prototype, as well as analogue (using glue, Diamond 1600) are given in table.2.

As can be seen from the data table.2 the proposed adhesive composition provides an increase in strength properties of adhesive joints in comparison with the prototype and decrease the curing time of the adhesive joint. So the strength of the adhesive joint strength of the prototype after 24, 48, 72 h, respectively 6,0; a 6.5 and 7.0 kg/cm2and using the proposed composition after 24, 48 and 72 h, respectively, and 7.1, and 8.2 and 8.3 kg/cm2.

Thus as can be seen from the table.2 when combined in the proposed adhesive composition of the copolymer of styrene and piperylene with the content of the bound styrene 91-93 mol.% and rosin, esterified with glycerol to 40% , in the specified proportions (when the benefits of the adhesive joint when gluing products from ferrites, due to the participation of the copolymer and a partially esterified glycerol rosin intensive complexation with metal ions on the surface of the ferrite.

Technical and economic effect, resulting from the application of the adhesive compositions is that its use can significantly improve the quality fastening products from ferrites, to improve the technological parameters of the bonding process. In addition, its use allows the use of by-product (waste) petrochemical production (piperylene).

The ADHESIVE COMPOSITION comprising polychloroprene rubber, butylbenzaldehyde resin, a copolymer of styrene and piperylene and an organic solvent, characterized in that, to increase the strength of bonding of ferrite products and reduce the curing time, it contains as a copolymer of styrene and piperylene copolymer of styrene and piperylene with the content of the bound styrene 91 to 93 mol.% and additionally pine rosin, rosin, esterified with glycerol to 40 wt.%, diphenylguanidine, 2,2'-dibenzothiazoledisulphide, zinc oxide and magnesium oxide in the following ratio, wt.h.:

Polychloroprene rubber - 1o

styrene 91 to 93 mol.% - 1 - 6

Rosin, esterified with glycerol to 40 wt.% - 1 - 3

Pine rosin - 1 - 3

Diphenylguanidine - 0,5 - 1,5

2,2'-Dibenzothiazoledisulphide and 1.5 - 2.5

Zinc oxide - 4 - 6

Magnesium oxide - 10 - 14

Organic solvent - 300 - 700

 

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