Powder Adhesion Promoters Based on Hydrolysis Lignin for Rubbers

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Resumo

Powder adhesion promoters for rubbers based on hydrolysis lignin were obtained by its treatment with TiCl4 solution in C6H14. The physical-chemical properties of the obtained products were determined: bulk density, content of Ti(IV), carbonyl, carboxyl groups, acid-insoluble lignin. The obtained powder adhesion promoters were introduced into rubber compound in the amount of up to 5 phr (parts per 100 of rubber). Butadiene-α-methylstyrene rubber grade SBR-1705 HI-AR was used. The effect of the promoters on the kinetic parameters of vulcanization and physical-mechanical properties of rubbers was studied. It was revealed that the introduction of the studied powder promoters of adhesion into the rubber compound allows to increase the bond strength at the interface rubber–brass-plated metal cord by 2–3 times.

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Sobre autores

L. Kuvshinova

Institute of Chemistry of the Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: fragl74@mail.ru
ORCID ID: 0000-0002-1964-6691
Rússia, Syktyvkar, 167000

E. Udoratina

Institute of Chemistry of the Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences

Email: fragl74@mail.ru
ORCID ID: 0000-0002-7146-2806
Rússia, Syktyvkar, 167000

Yu. Karaseva

Kazan National Research Technological University

Email: karaseva_j@mail.ru
ORCID ID: 0000-0001-6531-4252
Rússia, Kazan, 420015

E. Cherezova

Kazan National Research Technological University

Email: fragl74@mail.ru
ORCID ID: 0000-0002-6743-1097
Rússia, Kazan, 420015

A. Lobinsky

A. F. Ioffe Physical-Technical Institute of the Russian Academy of Sciences

Email: fragl74@mail.ru
ORCID ID: 0000-0001-5930-2087
Rússia, St. Petersburg, 194021

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2. Fig. 1. Micrographs of the original hydrolytic lignin HL0 in the visible field of 200 μm (a), particles of the HL0 sample presented in its entirety (b), a photograph of the HL0 sample (c), micrographs of the HL2 sample obtained by the action of TiCl4 in hexane on the hydrolytic lignin in the visible field of 200 μm (d) and HL2 particles on a similar scale presented in the micrograph (b) for HL0 (d), and a photograph of the HL2 sample (e).

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3. Fig. 2. Effect of Ti(IV) content in samples HL0 (0 mg/g), HL1 (26.6 mg/g) and HL2 (61.4 mg/g) on the content of carbonyl and carboxyl groups, as well as the fraction of samples (ωp) soluble in a 10% aqueous solution of H2SO4, and the increase in the mass (∆m) of hydrolytic lignin HL0 after treatment in the TiCl4 system in hexane in relation to its initial weight.

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4. Fig. 3. X-ray photoelectron survey spectrum of sample HL2 (a), fine structure of spectral lines Ti 2p (b), O 1s (c), C 1s (d).

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5. Fig. 4. IR spectra (a) and diffraction patterns (b) of samples: initial hydrolytic lignin HL0 (1) and products of the action of TiCl4 in hexane on hydrolytic lignin HL1 (2) and HL2 (3).

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6. Fig. 5. Rheometric parameters of rubber compounds: minimum torque Mmin of rubber compound (a) containing modifier HL0 (1), HL1 (2), HL2 (3), respectively; maximum torque Mmax of rubber compound (a) containing modifier HL0 (1ʹ), HL1 (2ʹ), HL2 (3ʹ), respectively; vulcanization optimum t90 of rubber compound (b) containing modifier HL0 (1), HL1 (2), HL2 (3), respectively.

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7. Fig. 6. Physical and mechanical properties of vulcanizates before and after thermo-oxidative aging, containing different amounts of modifiers HL0 (1), HL1 (2), HL2 (3): conventional tensile strength fP (a), relative elongation at break ɛP (b), rebound elasticity R (c), Shore A hardness (d), bond strength of rubber–brass-plated metal cord (d).

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8. Fig. 7. Proposed scheme for increasing the adhesive strength of vulcanizates: control comparison sample without modifier (a), vulcanizates with the addition of modifiers HL1 and HL2 (b). 1 – carbon steel wire – metal cord, 2 – brass, 3 – copper and zinc oxide film. n = 1–7, R – lignin or cellulose macromolecule.

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9. Fig. 8. SEM and EDA analysis of the side section of rubber without modifier (a, b) and with HL2 modifier in the amount of 5 parts by weight per 100 parts by weight of rubber (c, d), respectively.

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