SU783311A1 - Rubber mixture based on vinylidene fluoride copolymer - Google Patents

Description

This goal is achieved in that the composition based on a copolymer of vinyl ether fluoride, including a filler, a vulcanization activator, a vulcanizing agent and a plasticizer - aromatic C - containing hexafluoropropylene oxide gambo or its mixture with the composition (composition A) containing a fluoropolymer of the formula

Ng

Zn Vrz-YNg-s ng

f

but - oh

ll

m

where -99.5 - 100; L —O-5; boromethyl- - trifluoropropylsiloxane (Aerosil-300), methyl- (JJ - fluoropropyl-polymethoxysilane, redoxide, 2,4-dichlorobenzosch1 peroxide paste and low molecular weight papidimethylsiloxane at a ratio of components, May. h: 90-94: 6-10:. -35-36: 6.8-7.2-5.0-6; 0.2-3: 2.5-3 in the amount of ZO-50 mass parts v per 100 Mad hours of rubber, as oligomer contains oligomer of formula (P)

, UP O-fP-ttP o}; j. YYYY-1 "- S (M

ail

er

".

Ing d and the components of the rubber composition are taken in the following amounts, h: The vinylidene fluoride copolymer100 Filling agent 10-ZO Vulcanization activator 10-15 Vulcanizing agent 4-6 Oligomer of the specified formula or its mixture with ZO-50 wt.h. of the composition on 1OO wt.h. rubber1-15 Example 1 -. A rubber mixture is prepared for laboratory roller drums at a surface temperature of 30–40 and a mixing time of 1820 minutes according to the following recipe, iy “ac. h .: Copolymer of vinylidene fluoride with hexafluoropropylene with mop mass 90O.OOOO1OO Calcium oxide S gt | -OrgY - | - OCFjClF Jtz Bela soot (U-333) Composition A Oligomer of formula (P) at X-Paste peroxide 2,4 -dichlorobenzoyl6, d Synthetic tubes vulcanize. Thermostat at atmospheric atmospheric temperature and temperature 200 for 12 hours with a step-by-step temperature increase or up to 200 for 3.5 hours. The resulting tubes have the following isico-mechanical properties: Tensile strength, kgf / cm 81 Elongation,% 28O Residual elongation, % 7 In this case, the weight loss of the product in the process of vulcanization is O, 17% g

Examples 2-15. Prepare the rubber mixtures according to the method shown in Example 1, Mixtures. differ in the type of fora rubber, opigomer and their quantitative ratio. The compositions of the mixtures are given in Table. 1. The corresponding mechanical properties of vulcanizates and mass loss during vulcanization are given in Table. 2. For comparison, a test case using is given. . monofunctional oligmer

It follows from the above data that the obtained rubbers, while maintaining their strength characteristics at the level of rubbers with a known monofunctional plasticizer, have an application for a time that has less mass loss during vulcanization (0.11-0.25% compared to 2.5% for the control rubber mixture), which allows for nrakgically completely avoiding pore formation in the products.

Claims (1)

The formula of the invention A rubber composition based on a vinylidene fluoride copolymer comprising a filler, a vulcanization activator, a curing agent and a plasticizer — aromatic N — containing a hexafluoropropylene oxide oligomer or a mixture thereof with a composition containing a fluorosiloxane polymer of the formula (1) 14 where GL -99.5-100; p -0-5; bormegil-trifluoropropylsilane (aerosil-300), methyl-trifluoropropyl dimethoxysilane, redoxide, 2,4-dichlorobeneoyl peroxide paste and low molecular weight polydimethylsiloxane in the ratio of the components of the composition, mass, parts: 90-94: 6-10; 35-36; 6.8-7.2 5.06.0; 2-3: 2.5-3, in the amount of 3050 weight. hours per 100 mass. including rubber, characterized in that, in order to reduce the loss of mass of rubbers during vulcanization of this mixture and to avoid pore formation in rubbers, as an oligomer, the rubber composition containing an oligomer of the formula I YO '- Oh ---- Si Ί. gdgh. *. <* e and the components of the rubber composition are taken in the following quantity, May. hours Vinyl copolymer 100 denfluoride Filler Vulcanization activator 10-30 10-15 Vulcanizing agent 4-6 Oligomer Indicated 40 formulas or a mixture thereof with 30-50 parts by weight the specified composition per 100 weight. including rubber 1-15