A kind of nitrated nitrile rubber and its preparation method and application
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A technology of nitrile butadiene rubber and nitrated nitrile, which is applied in the field of nitrated nitrile butadiene rubber and its preparation, to achieve the effects of simple process, short reaction time and convenient operation
Active Publication Date: 2020-07-24
BEIJING UNIV OF CHEM TECH
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Problems solved by technology
Therefore, the nitration of rubber macromolecules can provide a new research idea for the subsequent modification of rubber, but there are very few studies on the nitration of rubber macromolecules.
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Embodiment 1
[0041] The present embodiment provides a kind of nitronitrile butadiene rubber and preparation method thereof, and concrete steps are as follows: take chlorobenzene as solvent, take nitrile butadiene rubber as raw material, make nitrile butadiene rubber into nitrile butadiene rubber chlorobenzene that the mass fraction is 7% in advance solution. AgNO 2 and TEMPO were sequentially added to the reaction flask to control the AgNO 2 The consumption of TEMPO is 75% of acrylonitrile-butadiene rubber, and the consumption of TEMPO is 15% of acrylonitrile-butadiene rubber, heats up and carries out nitration reaction, and reaction temperature is 75 ℃, and the reaction time is 12 hours, centrifugal after reaction finishes, and dry 24 hours under 50 ℃ Hour. The hydrogen nuclear magnetic resonance spectrum shows that the nitro group has been successfully inserted on the nitrile rubber and can characterize its degree of nitration, and TG characterizes its thermal stability. The degree of...
Embodiment 2-4
[0044] Embodiment 2-4 provides a kind of nitrated nitrile rubber and preparation method thereof respectively, and concrete condition is as shown in table 1:
[0045] Compared with Example 1, the difference is that the solvents are respectively chlorobenzene, chloroform, toluene and dichloroethane. The degree of nitration of gained nitrile rubber is as shown in table 1.
[0046] The degree of nitration under different solvent conditions in table 1
[0047] solvent Nitrification degree / % Example 2 Chloroform 11.0 Example 3 toluene 13.5 Example 4 Dichloroethane 10.3
Embodiment 5-10
[0049] Embodiment 5-10 provides a kind of nitrated nitrile rubber and preparation method thereof respectively, and specific conditions are as shown in table 2:
[0050] Compared with Example 1, the difference is that AgNO 2 The dosages are respectively 10%, 20%, 30%, 50%, 70%, 90% of the mass of the dry nitrile rubber. The degree of nitration of gained nitrile rubber is as shown in table 2.
[0051] Table 2 Different AgNO 2 The degree of nitrification at the dosage
[0052] AgNO 2 Amount / %
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Abstract
The invention relates to modification of rubber materials, in particular to nitrated butadiene-acrylonitrile rubber as well as a preparation method and application thereof. The preparation method comprises the following step that nitration reaction is carried out on butadiene-acrylonitrile rubber by taking AgNO2 as a nitration agent so as to obtain the nitrated butadiene-acrylonitrile rubber, wherein in the nitration reaction, one of TEMPO, DPPH or p-benzoquinone and tetramethyl-benzoquinone serves as a catalyst. According to the nitrated butadiene-acrylonitrile rubber as well as the preparation method and application thereof, the butadiene-acrylonitrile rubber is nitrated by adopting the AgNO2 as the nitration reagent, the epoxidation step can be avoided, the nitrated butadiene-acrylonitrile rubber is obtained in one step, no gel is generated in the reaction process, the reaction time is short, the process is simple, and the operation is convenient; the liquid butadiene-acrylonitrilerubber is changed into an energetic bonding material from a common liquid rubber material, and the nitro group-containing nitrated liquid butadiene-acrylonitrile rubber; and meanwhile, a certain amount of nitro groups are introduced into molecular chains of conventional hydrogenated butadiene-acrylonitrile rubber to serve as active reactive groups, and a new research idea is provided for further modification.
Description
technical field [0001] The invention relates to the modification of rubber materials, in particular to a nitrated nitrile rubber and its preparation method and application. Background technique [0002] Since the 1940s, nitrile rubber (NBR), as an oil-resistant special rubber, has been widely used in engineering seals and transmissions. In the 1980s, industrial automation and high-tech developed rapidly, requiring rubber products to have good high temperature resistance, aging resistance, chemical corrosion resistance and excellent physical and mechanical properties on the basis of oil resistance. But the carbon-carbon double bond in the NBR structure affects its heat resistance and service life. [0003] For this reason, foreign countries developed a new type of saturated oil-resistant rubber—HNBR in the 1980s, realized industrialization and put it on the market. The unsaturated double bonds in nitrile rubber are selectively hydrogenated in the presence of a catalyst to g...
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