Chloroprene rubber-based rubber compound

FIELD: rubber industry.

SUBSTANCE: invention relates to rubber compound based on "Nairit DP" chloroprene rubber, which compound comprising magnesium oxide, zinc oxide, stearic acid, carbon black (P-145) as rubber extender, and, additionally, modifier preliminarily obtained via interaction, at 150°C, of 1.66-6.68 wt parts epoxide dian resin ED-20 and 0.83-3.34 wt parts aniline production bottom waste containing 15-18 wt parts aniline at weight ratio of components 2:1, respectively.

EFFECT: increased adhesion for metal, improved physico-mechanical characteristics, and reused aniline production waste.

5 tbl

 

The invention relates to the rubber industry, in particular to the development of rubber based on polychloroprene rubber, rubber which is characterized by increased adhesion to metal.

Known rubber mixture based on polychloroprene rubber, including cobalt oxide, cobalt chloride, mineral filler, processing AIDS n-financiacion (USSR Author's certificate No. 670585, CL 08L 11/00; Publ. 30.06.79).

However, this compound has good adhesion to silver.

Known vulcanicola rubber mixture based on chloroprene rubber, comprising a plasticizer - hexyldecanoic ether 1,2-cyclohexandione acid (USSR Author's certificate No. 804667, CL 08L 11/00; Publ. 15.02.81).

However, this compound has a low strength.

Known rubber mixture based on chloroprene rubber, comprising the vulcanization accelerator is a waste product of the research (USSR Author's certificate No. 992536, CL 08L 11/00; Publ. 30.01.83).

However, this compound has a low strength.

Known rubber mixture based on chloroprene rubber for the manufacture of hose membranes cable containing zinc oxide, magnesium oxide, a vulcanization accelerator, an antioxidant, a plasticizer, mineral and organic is a mini-fillers (RF Patent No. 2064698, CL NW 3/23; Publ. 27.07.96).

However, this compound has a complex structure and has a low physical and mechanical properties.

The closest is the rubber mixture based on chloroprene rubber, sulfur regulation, including magnesium oxide, zinc oxide, stearic acid, and carbon black PM-15 (Koshelev FF and other General technology of rubber. M.: Chemistry, - 1978, p.86).

However, this rubber after vulcanization has a low mechanical and adhesive performance when attaching rubber to metal (gained strength under uniform separation does not exceed 1,26 MPa).

Task: development of rubber based on polychloroprene rubber, which is characterized by increased adhesion to metal.

The technical result is the development of rubber based on polychloroprene rubber, which is characterized by increased adhesion to metal using chloroprene glue marks SA, improved physical and mechanical properties, disposal of waste petrochemical production (aniline).

The technical result is achieved by the fact that the rubber mixture based on chloroprene rubber stamps Nairit PD, including magnesium oxide, zinc oxide, stearic acid, and the filler is carbon black and the filler is on contains carbon black mark P-145 and optionally a modifier, pre resulting from the interaction at 150°With 1.66-6,68 parts by weight of epoxy Dianova resin ED-20 and 0,83-3,34 parts by weight of distillation waste of aniline, aniline content 15-18 parts by weight, in a mass ratio of 2:1, respectively, in the following ratio of components, parts by weight: chloroprene rubber stamps Nairit DP - 100,0, magnesium oxide - 5,0-9,0, zinc oxide - 3,0-7,0, stearic acid - 0.5, carbon black P-145 - 50,0-60,0, modifier 2,5-10,0.

As chloroprene rubber used rubber sulfur regulation Nairit DP (TU-6-01-1319-85).

Curing group: zinc oxide (zinc white GOST 202-84) and magnesium oxide (burnt magnesia GOST 844-79).

Stearic acid - a vulcanization activator (GOST 6484-96).

Carbon black P-145 - filler (GOST 7885-86).

It is established that the reason for increasing the adhesion performance of the vulcanizates is the increase in the content of polar functional groups by introducing into the rubber compound of the proposed modifier.

When used as a modifier of epoxy Dianova resin ED-20 and distillation waste of aniline (KPA) mass ratio of 2:1 improved physical-mechanical and adhesive properties of vulcanizates based on the proposed rubber compound. When changing the component ratio of the modifier, it becomes viscous, h is about makes its introduction in the rubber mixture, this reduces the adhesive properties of vulcanizates based rubber compound.

Modifier receive a direct interaction epoxy Dianova resin ED-20 kovovymi waste production of aniline in a mass ratio of 2:1, at 150°C for 5 hours. The modifier is a fragile granules of irregular shape and is cheap material, KPA are waste resulting from the production of aniline (TR production of aniline CJSC "Orgsintez" Volzhskiy city, phase selection trademarks of aniline). KPA represent (parts by weight): aniline 15-18, cyclohexylamin - 0-10, toluidine - 2-4, sodium hydroxide - 1-3, diphenylamine - 3-20, metaphenylenediamine - 1-3, o-, n-aminophenol - 1-6, high molecular weight resinous substance - 6 : 45 a.m.

An example of the preparation of the rubber mixture.

The rubber mixture (a mixture of chloroprene rubber plant DP, magnesium oxide, zinc oxide, stearic acid, carbon black P-145 and modifier) to prepare a roll mill at a temperature of rolls 65-70°C. the Duration of mixing for 25 minutes. Then carry out the vulcanization of the rubber mixture at a temperature of 143°C for 30 minutes.

Get rubber compound 1-10, the compositions of which are given in table 1.

The composition of the modifier are shown in table 2.

Table 3 shows the physico-mechanical properties of vulcanizates based on the proposed cut is a new product and prototype.

Technology pasting the following samples. Disposable adhesive to the prepared surface, drying the adhesive film at room temperature (20° (C) for 1-2 minutes, then made a tight pressing of the bonding surfaces.

Table 4 shows the strength properties of vulcanizates based on the proposed rubber mixtures and the prototype made by bonding them with each other chloroprene adhesives brand SA. We offer the vulcanizates were tested for adhesive strength under shear achieved through keeping under load of 2 kg at room temperature (20° (C) within 24 hours. Table 4 shows that the best results are obtained when using the compositions 1, 6, 8 and 10. So the shear strength for bonding vulcanized rubber prototype glue SA is 1,29 MPa, for bonding vulcanized rubber according to the recipe of the composition 10 is 2,11 MPa.

The stated limits of the modifier 2,5-10,0 due to the fact that when you increase or decrease ukazannyh dosages adhesive strength for bonding vulcanizates with each other is reduced.

Adhesion shear was determined on a tensile testing machine MPC-250 (GOST 16971-71). Further studies performed with compositions 1, 6, 8 and 10, which were obtained the best results.

Also, tests were carried out glue the first mounting vulcanizates to steel (St3) (table 5). Adhesion was determined by the method of separation. Strength under uniform separation was determined by measuring adhesion JI MG4 (TU 4271-005-12585810-01).

From table 5 it is seen that the vulcanizates on the basis of compositions 1, 6, 8 and 10 provide an increase in strength properties of adhesive joints in comparison with the prototype. So the strength of the detachment of the adhesive joint when attaching vulcanized rubber prototype to steel (St3) glue SU $ 1.26 MPa, and when securing the vulcanized rubber composition 8 to steel (St3) is 1.54 MPa.

7,0
Table 1
The components of the mixtureThe content of the mixture components in the compositions, parts by weight
The placeholder12345678910
Chloroprene rubber Nairit DP100,0100,0100,0100,0100,0100,0100,0100,0100,0100,0100,0
Zinc oxide5,05,05,05,05,05,03,03,07,07,0
Magnesium oxide7,07,07,07,07,07,09,09,05,05,05,0
Stearic acid0,50,50,50,50,50,50,50,50,50,50,5
Black carbon PM-1540,0----------
Carbon black P-145-60,060,050,050,050,050,050,060,060,060,0
Modifier-5,010,02,55,07,52,55,02,55,07,5

Table 2
Components of modifierThe content of the component modifier for rubber
1 2345678910
Epoxy Dianova resin ED-203,34of 6.681,663,345,001,663,341,663,345,00
Distillation waste from the production of aniline with aniline content parts by weight of 15-181,673,340,831,672,500,831,670,831,672,50

Table 3
IndicesThe results of the tests of songs
The placeholder12345678910
Conventional strength, MPa16,5of 21.2of 21.221,7a 21.521,421,021,722,222,722,0
Elongation, %420200210260 270260260240180170190
Hardness, units shore a6982858283848081878687
Tear resistance, kgf/cm6972588388837391636579

Table 4
Brand glueThe indicator for the composition
The placeholder12345678910
The shear strength, MPa
SA1,291,751,561,381,461,301,801,471,831,432,11

Table 5
Brand glueDormancy is a pointer to songs
The placeholder16810
Strength under uniform separation, MPa
SA1,261,411,381,541,40

Technical and economic effect, resulting from the application of the rubber mixtures based on chloroprene rubber is that its application can significantly increase the strength of attachment of the articles of vulcanized rubber based on polychloroprene rubber and in their attachment to the metal surface to improve the physico-mechanical properties of vulcanizates. In addition, its use allows the use of by-product (waste) petrochemical production (aniline).

The rubber mixture based on chloroprene rubber stamps Nairit PD, including magnesium oxide, zinc oxide, stearic acid, and the filler is carbon black, characterized in that the filler it contains carbon black mark P-145, and optionally, a modifier, a pre-obtained as a result of interaction at 150°With 1.66-6,68 parts by weight of epoxy Dianova resin ED-20 and 0,83-3,34 parts by weight of distillation waste of aniline with aniline content 15-18 parts by weight of a mass ratio of 2:1, respectively, with abuses ratio of components parts by weight of:

Chloroprene rubber stamps Nairit DP100,0
Magnesium oxide5,0-9,0
Zinc oxide3,0-7,0
Stearic acid0,5
Carbon black mark P-14550,0-60,0
Modifier2,5-10,0



 

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