Data on compressibility of NBR samples with various cross-linking degree and zinc oxide content immersed in gasoline and oil

NBR materials are widely used in oil refining, automotive industry and aviation due to the high tensile strength and elasticity, resistance to dilute acids. During operation with oils and fuels NBR materials undergo aging, which results in deterioration of the properties of materials [1]. The data on compressibility of NBR samples with 0, 1 and 10% zinc oxide and various cross-linking degree immersed in oil at 150°C for 5 hours and in gasoline at room temperature for 5 hours according to ASTM F146 – 12 [2] was collected. The cross-linking degree of NBR was calculated as the ratio of the heats of cure of samples vulcanized at specified temperate and time and unvulcanized samples as described at ISO 11357-5:2013 [3]. Compressibility was measured using a Tinius Olsen H5KS tensile testing machine according to ASTM F36 – 15 [4]. The data demonstrates the influence of vulcanized conditions and zinc oxide as a sulfur vulcanization activator content on compressibility change after deterioration in oil.

a b s t r a c t NBR materials are widely used in oil refining, automotive industry and aviation due to the high tensile strength and elasticity, resistance to dilute acids. During operation with oils and fuels NBR materials undergo aging, which results in deterioration of the properties of materials [1] . The data on compressibility of NBR samples with 0, 1 and 10% zinc oxide and various cross-linking degree immersed in oil at 150 °C for 5 hours and in gasoline at room temperature for 5 hours according to ASTM F146 -12 [2] was collected. The cross-linking degree of NBR was calculated as the ratio of the heats of cure of samples vulcanized at specified temperate and time and unvulcanized samples as described at ISO 11357-5:2013 [3] . Compressibility was measured using a Tinius Olsen H5KS tensile testing machine according to ASTM F36 -15 [4] . The data demonstrates the influence of vulcanized conditions and zinc oxide as a sulfur vulcanization activator content on compressibility change after deterioration in oil.
© 2020 The Author(s Value of the data • The data on compressibility demonstrates the influence of vulcanized conditions and zinc oxide as a sulfur vulcanization activator content on NBR resistance to aging in oil. It may be used for the optimization of zinc oxide content and curing time in NBR preparation synthesis. • The data in the article may be used in further experiments to identify the key factors of NBR preparation responsible for oil resistance. • The data may be used for research of NBR aging mechanism in fuels which includes a set of parallel processes [5] .

Data Description
The composition of all blends are shown in Table 1 . K1, K2 and K3 blends have different zinc oxide content.
Vulcanization conditions (temperature and time) are shown in Table 2 . Table 3 represents the calculation results on cross-linking extent for K1, K2 and K3 blends vulcanized according Table 2 , on compressibility before and after immersion in gasoline and oil and mass change. All raw data are presented in Tables 4 , 5 and 6 (data on compressibility, mass and DSC respectively).

Experimental Design, Materials, and Methods
The mixing of rubber compounds was carried out in two steps. In the first step, sulfur, TMTD, MBT and zinc oxide were mixed with toluene under constant stirring at room temperature for 30 min. In the second step, the powder acrylonitrile-butadiene rubber was added and the blend was stirred for 12 h. The ratio PBNK-40 : toluene was 1:4. The composition of all blends are shown in Table 1 . Afterwards the blend was placed on the silicone paper to form an even layer and dried out for 48h.
The vulcanized sheets (from which test specimens were cut) were produced in an electrically heated hydraulic press. The pressure was 4 MPa, vulcanization temperature and time are shown in Table 2 .
Differential scanning calorimetry was carried out on 10 mg samples of each material using a NETZSCH DSC 204 Phoenix differential scanning calorimeter calibrated with metal standards. Runs were conducted under 100 ml/min nitrogen gas flow and the heating rate was 5 K/min.   Kinetic parameters of the resins curing processes were calculated on the base of differential scanning calorimetry data via NETZSCH Thermokinetics 3.0 software. The cross-linking (conversion) extent was calculated as the ratio of the heats of cure of samples vulcanized at specified temperate and time and unvulcanized samples according to ISO 11357-5:2013. The assessment of oil resistance was carried out according to the following procedure. Test samples 25 × 50 mm in size were weighed and immersed in a flask with oil at a temperature of 150 °C for 5 hours. Then it was kept for 30 minutes in oil at room temperature, washed in nephras and the weight was re-measured. The aging in gasoline was carried out at room temperature for 5 hours. The immersion in oil and gasoline was carried out according to according to ASTM F146 -12. Compressibility was measured using a Tinius Olsen H5KS tensile testing machine according to ASTM F36 − 15.

Declaration of Competing Interest
The research was supported by the Ministry of Education and Science of the Russian Federation, Resolution No. 218, 2010, April 9-th (Contract No. 03.G25.31.0220 (Development of hightemperature composite seals for improve energy-saving and reliability of sealing equipment and pipelines) between JSC UNICHIMTEK and Lomonosov Moscow State University).
The authors declare that they have no known competing financial interests or personal relationships which have, or could be perceived to have, influenced the work reported in this article.