Rubber mixture for production of diaphragms of formator-vulcanisers

FIELD: chemistry.

SUBSTANCE: invention relates to rubber industry and deals with production of rubber products such as tyres, etc. Rubber mixture contains mixture of caoutchoucs, wt.p - butylcaoutchouc - 75-90, chloroprene caoutchouc - 0-10 and chloride-containing ethylene-propylene-diene filled caoutchouc 7-20. Chloride-containing ethylene-propylene-diene caoutchouc is obtained by mixing ethylene-propylene-diene and chloride-containing caoutchouc in presence of silicon colloidal dioxide. Rubber mixture contains also per 100 wt.p of mixture of caoutchoucs: stearic acid -1-3, zinc oxide - 4-10, technical carbon-30-60, mineral oil "stabiloil" -3-8 and phenol-formaldehyde resin "amberol137" -5-10.

EFFECT: obtaining rubber which has reduced creep and pitching, as well as increased dynamic durability.

2 tbl

 

The invention relates to the formulation of rubber compounds and can be used in the rubber industry in the manufacture of tires and rubber products.

Known rubber mixture based on chloroprene and isoprene rubbers, including as modifier chlorosarin (SU 516718, 1976). However, the rubber obtained from the rubber mixture, have considerable abrasion.

Known other rubber mixture based on chloroprene and butadiene-methylstyrene rubbers, including zinc white, carbon black, N-phenylnaphthylamine - 2, di (2-benzothiazolyl) disulfide, sulfur, stearic acid, paraffin wax and industrial oil. Get rubber have high strength characteristics, but have a high abrasion (Technical terms for parts of automobile and tractor engineering, No. 38-005-204-71).

From SU 1054379, 15.11.1983 known rubber mixture based on chloroprene and butadiene-methylstyrene rubbers, including zinc white, carbon black, N-phenylnaphthylamine-2, di (2-benzothiazolyl) disulfide, sulfur, stearic acid, paraffin wax, industrial oil, Polyoxypropylenediamine or Polyoxypropylenediamine when certain ratios of these components. The resulting rubber compound has a high resistance to abrasion, but do not possess the AET necessary properties, which is an object of the invention.

From RU 2296782, 10.04.2007 known rubber compound, which contains isoprene rubber, filled chloroticus obtained by the interaction with the mixture of butyl rubber and chlorinated hydrocarbon with the General formula CnH(2n+2)-xCLxwhere n=10-30, x=7-24 at a temperature of 80-150C in the presence of colloidal silicon dioxide is introduced into the mixture during mixing, sulfur, sulfenamide accelerator, stearic acid, zinc oxide, carbon black, polyethylene, alkylenediamine resin. The technical challenge is to improve the protection of rubber against possible premature vulcanization in the processes of its production and processing. However, the known rubber compound does not have the necessary combination of properties and is designed for the sealing layer in the production of tubeless tyres and pneumatic elements.

The technical objective of the claimed invention is to reduce creep, osmolality and increase the dynamic endurance of rubbers for diaphragms of the shaper-vulcanizers.

The goal of the project is achieved in that the rubber mixture for the production of diaphragms of shaper-vulcanizers includes butyl rubber, chloroprene rubber and chlorinated ethylene-propylene-diene-filled rubber, the floor is built by mixing ethylene-propylene-diene rubber and a chlorinated hydrocarbon with the General formula C nH(2n+2)-xCLxwhere n=10-30, x=7-24 at a temperature of 80-150C in the presence of colloidal silicon dioxide is introduced into the mixture during mixing, as well as the rubber mixture contains per 100 parts of the mixture of rubber stearic acid, zinc oxide, carbon black, mineral oil "Stabilis" and phenol-formaldehyde resin "Amberol-137" in the following ratio of the components of the rubber mixture in parts by weight:

Butyl rubberof 75.0 to 90.0
Chloroprene rubber0-10,0
The above chlorine
ethylene-propylene-diene-filled rubberof 7.0 to 20.0
Stearic acid1,0-3,0
Zinc oxide4,0-10,0
Carbon30,0-60,0
Mineral oil "Stabilis"3,0-8,0
The phenol-formaldehyde resin "Amberol-137"5,0-10,0

In the rubber mixtures according to the invention is used, n is the sample, as a butyl rubber - butyl rubber BK-1675, carbon black - carbon black N 330 (PW-75), mineral oil - oil "Stabilis", phenol-formaldehyde resin - resin "Amberol-137".

As the chlorinated ethylene-propylene-diene rubber in the rubber mixture according to the invention contains a chlorinated ethylene-propylene-diene rubber HEPDB-2, obtained, for example, based on the following technologies:

In the rubber mixer type rvsd frequency (Freccia 1:1.5) loaded ethylene-propylene-diene elastomer (SEPT-60) in an amount of 95 parts by weight is Then loaded chlorinated hydrocarbon of the formula CnH(2n+2)-xClxwhere n=20, x=21 in an amount of 5 parts by weight of the Mixture is processed at a temperature of 80C and the rotational speed of rotor, rpm: front 30, rear - 45. At the 11th minute in the mixer is loaded with 5 parts by weight of colloidal silicic acid (SiO2). The resulting product contains combined chlorine 2.0 to 2.3 wt.%.

Applying a new chlorinated ethylene-propylene-diene rubber with a chlorine content of 20,5% molar chlorine (HEPDB-2) instead of 15 parts by weight of butyl rubber BK-1675 in recipes rubber diaphragm allows to optimize the number of specific characteristics (creep, dynamic endurance, osmolality), which can lead to a substantial increase in service life of the diaphragms of the shaper-vulcanizers. The application of the new rubbers is as HEPDB-2 also allows you to increase the conditional tensile strength, elasticity to rebound and relative residual elongation after break with maintaining other properties of the rubber mixtures and vulcanizates at the required level.

The following example illustrates the invention but does not limit it (see table 1). For comparison with the rubber mixture according to the invention was prepared by famous rubber mixture for the production of diaphragms of shaper-vulcanizers (technological regulations of the Moscow tire plant No. 404 W-89 "Production of passenger radial tires with steel cord breaker").

Example.

The rubber mixture is prepared in a rubber mixer rvsd frequency-250-40 in two stages. The first stage is the duration of mixing for 15 minutes, the temperature of the discharge 175C, the second stage is the duration of mixing 5 min, temperature of discharge 120C. In the second stage is entered zinc oxide and phenol-formaldehyde resin.

The vulcanization of the mixtures is carried out in a press at a temperature of 175C. Plastoelastic, physico-mechanical and some specific properties of rubber mixtures and vulcanizates determined in accordance with existing state Standards. Osmolality rubbers is determined in accordance with the methodology described in the dissertation on competition of a scientific degree of candidate of technical Sciences Turgumbaeva HH (Research Sept tire rubbers, Moscow, MITHT, 1968, 136 S.).

Table 1
ComponentsThe content of components in parts by weight per 100 parts by weight rubber in the mixture
known under the rulesaccording to the invention
Butyl rubber BK-167595,080,0
Chloroprene rubber5,05,0
Rubber HEPDB-2-15,0
Stearic acid2,02,0
Zinc oxide5,05,0
Carbon black N 330 (PW-75)50,050,0
Oil "Stabilis"5,05,0
The phenol-formaldehyde resin "Amberol-137"8,08,0

The properties of the rubber mixtures according to the invention is known and is presented in table 2.

Table 2
PropertiesThe performance properties of rubber mixtures and vulcanizates
known under the rulesaccording to the invention
Plasticity, srvc. units0,410.42
The Mooney viscosity at 140C, srvc. units3736
Conventional tensile strength elongation 300%, MPa5,06,0
Conditional tensile strength, MPa10,212,6
Elongation at break, %620600
Relative residual elongation after break, %3420
Tear resistance, kN/m6063
The coefficient of thermal aging at 180C for 24 h (in terms of relative strength)0,6
The coefficient of temperaturesalinity at 100C (relative strength)0,70,62
Hardness TM-2, sm. units7478
Dynamic endurance before destruction, thousand cycles42>50
Creep at 160C for 24 h (at 30 g/mm2mm)11953
The elastic rebound after thermal aging at 180C for 24 h, %
at 20C1618
at 100C2830
Osmolality, %1,20,6

As follows from the above data, the rubber mixture according to the invention has high strength properties, resistance to heat aging, reduced creep and low osmolality.

The rubber mixture for the production of diaphragms of shaper-vulcanizers, comprising Butik ucuk, chloroprene rubber and chlorinated ethylene-propylene-diene-filled rubber obtained by mixing the ethylene-propylene-diene rubber and a chlorinated hydrocarbon with the General formula CnH(2n+2)-xClxwhere n=10-30, x=7-24 at a temperature of 80-150C in the presence of colloidal silicon dioxide is introduced into the mixture during mixing, as well as the rubber mixture contains per 100 parts by weight of a mixture of rubber stearic acid, zinc oxide, carbon black, mineral oil "stabilis" and phenol-formaldehyde resin "amberol 137" in the following ratio of components, rubber compounds, parts by weight:

butyl rubber75-90
chloroprene rubber0-10
the above chlorine
ethylene-propylene-diene-filled rubber7-20
stearic acid1-3
zinc oxide4-10
carbon30-60
mineral oil "stabilis" 3-8
resin phenol-formaldehyde "amberol 137"5-10



 

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