CN102604172A - Heat-resistant nitrile butadiene rubber composition - Google Patents

Abstract

The invention relates to a heat-resistant nitrile butadiene rubber composition which comprises the following components in part by mass: 50-90 parts of nitrile butadiene rubber, 10-50 parts of acrylate rubber, 3-5 parts of zinc oxide, 3-5 parts of magnesium oxide, 2-3 parts of stearic acid, 10-15 parts of white carbon black, 30-50 parts of spraying carbon black, 3-5 parts of sulfur, 2-3 parts of quinoxime, 2-5 parts of dicumyl peroxide, 5-10 parts of magnesium methacrylate, 4-9 parts of age resister OD, 5-10 parts of age resister BPPD and 1.5-3 parts of gamma-aminopropyltriethoxysilane, wherein 100 parts of nitrile butadiene rubber and acrylic rubber are included in total in the composition. By adding acrylic rubber to the nitrile butadiene rubber and under the joint effect of the auxiliaries, the heat resistance of the nitrile butadiene rubber is further improved, and the heat resistance temperature in long-term work can reach 125 DEG C; and moreover, the other properties of rubber are not obviously changed, and the heat resistance effect is good.

Description

A kind of thermotolerance acrylonitrile rubber composite

Technical field

The present invention relates to the rubber technology field, particularly a kind of thermotolerance acrylonitrile rubber composite.

Background technology

In recent years, owing to strengthen restriction day by day, make in-engine temperature rise to auto exhaust and noise thereupon.In order to reduce the maintenance cost of automobile, require to prolong the work-ing life of auto parts machinery.Like this rubber has just been proposed to improve stable on heating requirement.Concerning paracril, because of its good processability, oil resistance excellence and cheap being widely used, therefore improve the thermotolerance of paracril, prolong work-ing life, the expansion operating temperature range of goods, have considerable meaning.

Paracril is the random copolymers that divinyl and two kinds of monomers of vinyl cyanide make through free radical initiated emulsion polymerization.From the paracril analysis of the molecular structure; Can find out and contain two keys in the long molecular chain of paracril; And bond energy is low, subjects to the attack and the destruction of foeign element, causes degradation and loses use properties fast; Therefore must improve thermotolerance from reducing saturation ratio, or the chain bond energy that the molecular radical of introducing high bond energy improves molecule improves thermotolerance.

Summary of the invention

The object of the invention mainly is a kind of new paracril of exploitation; Further improve its resistance toheat; Guarantee that simultaneously other performance did not have obviously to change or change to occur in the allowed band heat-resisting effect and other performance requriements of assurance sizing material when adding some auxiliary agent improved resistance toheat.

Confirm that through the data of searching and a large amount of test practice paracril and acrylic elastomer have common vulcanization system and consistency better, can according to and with the purpose decision it also uses ratio, mix the latter on a small quantity and can improve thermotolerance.This prescription adopts peroxide vulcanizing system; State of vulcanization that can obtain to suit and good heat-resistant; While can cause magnesinm methacrylate and paracril carries out crosslinked; Generate the crosslinking structure of covalent linkage and ionic linkage, thereby the molecular radical of introducing high bond energy improves the resistance toheat of the chain bond energy and then the raising paracril of molecule.

Technical scheme of the present invention is following:

Thermotolerance paracril component and ratio of quality and the number of copies are:

Require paracril and acrylic elastomer to add up to 100 parts in the compsn.Through adding acrylic elastomer in paracril and under the acting in conjunction of various auxiliary agents; The resistance toheat of paracril has had further raising; The long term operation heat resisting temperature can reach 125 ℃, and not obviously change of other performances of rubber, and heat-resisting effect is good.

The raising of paracril resistance toheat has also improved the use value of rubber simultaneously, and nitrile rubber and goods thereof can better play a role in automotive field, field of petrochemical industry, have improved the safety control and the work-ing life of goods.

Embodiment

Thermotolerance paracril embodiment:

In mass fraction

Carry out common mixing processing by starting material and consumption in the listed prescription:

1, rubber, starting material weighing

2, refining-following sheet section is opened in one section banburying-

3, refining-following sheet section is opened in two sections banburyings-two

4, sulfide film

5, cut style by standard

6. detection makes an experiment

Be to use acrylic elastomer to improve the test-results of paracril resistance toheat below:

Through the summary to above-mentioned test, the resistance toheat of selecting for use acrylic elastomer to improve paracril is compared thermotolerance with traditional paracril prescription and is significantly improved.

Claims (1)

1. thermotolerance acrylonitrile rubber composite; It is characterized in that component and ratio of quality and the number of copies are:

50～90 parts of paracrils,

Acrylic elastomer 10～50,

Zinc oxide 3～5,

Natural manganese dioxide 3～5,

Triple Pressed Stearic Acid 2～3,

WHITE CARBON BLACK 10～15,

Spray carbon black 30～50,

Sulfur 3～5,

Quinone oximes 2～3,

Di Cumyl Peroxide 99 2～5,

Magnesinm methacrylate 5～10,

Anti-aging agent OD 4～9,

Anti-aging agent BPPD 5～10,

γ-An Jibingjisanyiyangjiguiwan 1.5～3;

Wherein paracril and acrylic elastomer add up to 100 parts in the compsn.