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Ozone-resistant low compressive deformation nitrile butadiene rubber and preparation method thereof

A technology of nitrile rubber and nitrile conversion, which is applied in the field of ozone-resistant low-pressure nitrile rubber and its preparation, can solve the problems of large compression set, poor ozone resistance performance, and poor low-temperature performance, so as to reduce the compression permanent Deformation, high ozone resistance, and the effect of increasing the degree of polymerization

Inactive Publication Date: 2019-09-06
NINGGUO ZHENGDAO RUBBER & PLASTIC PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As long as everything is extreme, the higher the content, the corresponding other properties will decrease, such as the deterioration of low temperature performance, the deterioration of ozone resistance and the increase of compression permanent deformation, etc.
Moreover, the ozone resistance of nitrile rubber itself is very poor, similar to natural rubber. The higher the acrylonitrile content, the greater the polarity of the molecule, the easier it is to be damaged by ozone, and the worse its ozone resistance performance is. Generally, some other products will be used together. Ozone-resistant rubber types, such as neoprene, PVC, etc., but considering the cost of materials after use, PVC is usually selected and used to improve its ozone performance, but the ozone resistance does not change much. In addition, it affects nitrile There are many factors for high-temperature compression permanent deformation of rubber compounds. The higher the acrylonitrile content of nitrile rubber, the more thermoplastic acrylonitrile blocks on the molecular chain, and the greater the compression permanent deformation of nitrile rubber. And once the nitrile rubber is combined with PVC, its compression permanent deformation will also increase with the increase of the content of PVC used together.

Method used

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  • Ozone-resistant low compressive deformation nitrile butadiene rubber and preparation method thereof
  • Ozone-resistant low compressive deformation nitrile butadiene rubber and preparation method thereof
  • Ozone-resistant low compressive deformation nitrile butadiene rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The specific preparation process of polyfluorinated vulcanizing agent is as follows:

[0033] Step 1: Add 3 mol of 2,4-pentanedione into diethyl ether, heat up to 70-80°C and reflux, then add 6.06 mol of hexafluorobutyl acrylate to it, react at constant temperature for 8-9 hours, and then carry out vacuum distillation to obtain fluorinated diketone;

[0034] Step 2: Prepare 6.3 mol of sodium bisulfite into a saturated sodium bisulfite solution, then add it to the reaction vessel, then add 3 mol of the fluorinated diketone prepared in step 1 to the reaction vessel, heat up to 50-60°C and stir for reaction 2-3h, and then filtered, and the filtered product was washed with deionized water and ethanol successively and then dried to obtain fluorinated dihydroxy sodium sulfite, such as figure 1 shown;

[0035] Step 3: Add 3 mol of fluorinated dihydroxy sodium sulfite and 6.15 mol of cumene hydroperoxide to the reaction vessel at the same time, then add 18 L of acetone soluti...

Embodiment 2

[0037] The specific preparation process of polyfluorinated vulcanizing agent is as follows:

[0038] Step 1: Add 3 mol of 2,4-pentanedione into diethyl ether, raise the temperature to 70-80°C and reflux, then add 3.01 mol of hexafluorobutyl acrylate to it, react at constant temperature for 8-9 hours, and then conduct vacuum distillation to obtain fluorinated diketone;

[0039] Step 2: Prepare 6.3 mol of sodium bisulfite into a saturated sodium bisulfite solution, then add it to the reaction vessel, then add 3 mol of the diketone fluoride prepared in step 1 to the reaction vessel, heat up to 50-60°C and stir for reaction 2-3h, and then filtered, and the filtered product was washed with deionized water and ethanol in turn, and then dried to obtain sodium dihydroxysulfite fluoride;

[0040]Step 3: Add 3 mol of fluorinated dihydroxy sodium sulfite and 6.15 mol of cumene hydroperoxide to the reaction vessel at the same time, then add 18 L of acetone solution to the reaction vessel...

Embodiment 3

[0042] The specific preparation process of polyfluorinated vulcanizing agent is as follows:

[0043] Step 1: Add 3 mol of 2,4-pentanedione into diethyl ether, heat up to 70-80°C and reflux, then add 6.06 mol of hexafluorobutyl acrylate to it, react at constant temperature for 8-9 hours, and then carry out vacuum distillation to obtain fluorinated diketone;

[0044] Step 2: Prepare 3 molmol of sodium bisulfite into a saturated sodium bisulfite solution, then add it to the reaction vessel, then add 3 mol of the fluorinated diketone prepared in step 1 to the reaction vessel, heat up to 50-60°C and stir for reaction 2 -3h, then filtered, and the filtered product was washed with deionized water and ethanol in turn, and then dried to obtain sodium fluoride hydroxysulfite;

[0045] Step 3: Add 3 mol of sodium fluoride hydroxysulfite and 3.05 mol of cumene hydroperoxide prepared in step 2 to the reaction vessel at the same time, then add 18 L of acetone solution to the reaction vesse...

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Abstract

The invention discloses an ozone-resistant low compressive deformation nitrile butadiene rubber. The ozone-resistant low compressive deformation nitrile butadiene rubber comprises, by weight, 30-60 parts of nitrile butadiene rubber, 60-90 parts of a nitrile butadiene-polyvinyl chloride polymer, 60-62 parts of N550 carbon black, 70-71 parts of N770 carbon black, 15-17 parts of a plasticizer, 5-6 parts of zinc oxide, 1-3 parts of stearic acid, 3-4 parts of an antioxidant, 3-4 parts of a processing aid, 0.625-0.631 part of a polyfluoro vulcanizer and 4.69-4.74 parts of a promoter. The polyfluorovulcanizer is added to the nitrile butadiene rubber to perform vulcanization crosslinking polymerization on the rubber; the polyfluoro vulcanizer contains a large amount of the fluorine element, so the prepared rubber has high resistance to ozone; and the polyfluoro vulcanizer contains two peroxy groups, so the polymerization degree of the rubber is improved, thereby the strength and the rigidityof the rubber are increased, and the compressive permanent deformation of the rubber is reduced.

Description

technical field [0001] The invention belongs to the technical field, and relates to an ozone-resistant low-pressure variable nitrile rubber and a preparation method thereof. Background technique [0002] The rubber products of yacht engine system components generally require weather resistance, oil resistance, and high sealing performance. On the one hand, nitrile rubber is a typical oil-resistant rubber. Because its molecular composition is a copolymer of butadiene and acrylonitrile, the functional group is a strong polar group, and its physical properties are outstanding oil resistance. It is widely used in Production of oil-resistant hoses, dynamic and static rubber gaskets, "O" rings, tapes, rubber rollers, rubber diaphragms and other products. In addition, nitrile rubber is divided according to the content of acrylonitrile. The higher the content, the better the oil resistance. The higher the content, the lower the corresponding other properties, such as the deteriorat...

Claims

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Application Information

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IPC IPC(8): C08L9/02C08L27/06C08K5/42C08K3/04C08K3/22C08K5/09C08K13/02
CPCC08K2003/2296C08L9/02C08L2201/08C08L2205/025C08L2205/03C08L27/06C08K5/42C08K3/04C08K3/22C08K5/09C08K13/02
Inventor 陶华伟秦文毅
Owner NINGGUO ZHENGDAO RUBBER & PLASTIC PARTS
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