阅读说明：本技术 一种硫磺体系彩色低压变耐高温nbr混炼胶及其制备方法 (Sulfur system color low-pressure variable high-temperature resistant NBR (nitrile-butadiene rubber) compound and preparation method thereof ) 是由 苏怀生 井垒 周国荣 张子阳 于 2021-09-16 设计创作，主要内容包括：本发明公开了一种硫磺体系彩色低压变耐高温NBR混炼胶,由以下重量百分比的组分组成：丁腈橡胶:44～50％,浅色补强剂15～21％,浅色填料21～27％,防老剂0.8～1.5％,其它配合剂3～6％,硫化促进剂2.5～5.0％。本发明产品采用硫磺体系,具有较低的压缩永久变形,优良的耐老化性能、耐油性能和弹性,具有良好的加工性能和物理机械性能。(The invention discloses a sulfur system color low-pressure variable high-temperature resistant NBR rubber compound, which comprises the following components in percentage by weight: 44-50% of nitrile rubber, 15-21% of light-color reinforcing agent, 21-27% of light-color filler, 0.8-1.5% of anti-aging agent, 3-6% of other compounding agent and 2.5-5.0% of vulcanization accelerator. The product of the invention adopts a sulfur system, has lower compression set, excellent aging resistance, oil resistance and elasticity, and good processing performance and physical and mechanical properties.)

1. The sulfur system color low-pressure-change high-temperature-resistant NBR rubber compound is characterized by comprising the following components in percentage by weight:

44.0-50.0% of nitrile rubber

15.0 to 21.0 percent of light-color reinforcing agent

21.0 to 27.0 percent of light-color filler

0.8 to 1.5 percent of anti-aging agent

3.0 to 6.0 percent of other compounding agents

2.5-5.0% of a vulcanization accelerator;

the other compounding agent is a mixture of zinc oxide, stearic acid, a processing aid and color masterbatch.

2. The sulfur system color low-pressure change high-temperature resistant NBR compound as claimed in claim 1, which is characterized by comprising the following components by weight percent:

45.0 to 47.0 percent of nitrile rubber

16.0 to 18.0 percent of light-color reinforcing agent

23.0 to 25.0 percent of light-color filler

1.0 to 1.5 percent of antiager

4.0 to 5.0 percent of other compounding agents

3.5 to 4.5 percent of vulcanization accelerator.

3. The sulfur system color low pressure change high temperature resistant NBR compound of claim 1, wherein the nitrile rubber is a combination of PERBUN 2845F and PERBUN 3446F.

4. The sulfur system colored low-pressure change high-temperature resistant NBR compound as claimed in claim 1, wherein the light color reinforcing agent is a mixture of white carbon ZJ-355 and basic white carbon SODASIL P95.

5. The sulfur system color low pressure change high temperature resistant NBR compound of claim 1, wherein the light color filler is a mixture of PF216 and R103.

6. The sulfur system colored low-pressure change high-temperature resistant NBR compound as claimed in claim 1, wherein the anti-aging agent is a mixture of NAUGARD 445 and ZMTI.

7. The sulfur system color low pressure change high temperature resistant NBR compound as claimed in claim 1, wherein the processing aid is a combination of processing aid WB222, processing aid 935P, and processing aid PEG 4000.

8. The sulfur system color low-pressure change high-temperature resistant NBR compound as claimed in claim 1, wherein the color masterbatch is color masterbatch R111A 2.

9. The sulfur system color low pressure change high temperature resistant NBR compound as claimed in claim 1, wherein the vulcanization accelerator is a mixture of S-80E, TMTD-75E, CBS-80E, TETD-80E and PVI.

10. The preparation method of the sulfur system color low-pressure-change high-temperature-resistant NBR compound as claimed in any one of claims 1 to 9, wherein the preparation method comprises the following steps: the method sequentially comprises the following steps:

(1) preparing materials in the following sequence:

sequentially comprising nitrile rubber, an anti-aging agent, other accessory ingredients, a light-color reinforcing agent, light-color filler and a vulcanization accelerator;

(2) firstly, mixing, namely putting the nitrile rubber, the anti-aging agent and other ingredients into an internal mixer for mixing for 60 s; firstly, putting a light-color reinforcing agent into an internal mixer, mixing for 120-180 s, then cleaning an upper top plug, then putting a light-color filler, mixing for 60-90 s, then discharging and discharging a sheet to prepare a rubber compound A for later use;

(3) and (3) mixing the rubber compound A for 60-80 seconds, cleaning, mixing for 30-60 seconds again, and discharging the sheet for later use after sufficient mixing and dispersion.

Technical Field

The invention relates to rubber, in particular to a sulfur system color low-pressure variable high-temperature resistant NBR rubber compound and a preparation method thereof.

Background

The existing sealing system has a large demand on color sealing rubber, and particularly in the field of mechanical sealing, the traditional black sealing element cannot meet the demand of product design in some places. With the rapid development of the mechanical industry, more requirements are provided for colorful NBR sealing rubber materials with high elasticity, low pressure change, aging resistance and oil resistance, and most of the colorful NBR products with the traditional formula have larger compression set and can not meet the requirements. The peroxide curing system can reduce the compression set of the colorful NBR product, but the curing time is long, the tearing performance is not good, and the economic benefit is influenced.

Therefore, the development of the color low-voltage variable high-temperature resistant NBR rubber compound vulcanized by adopting a sulfur system is urgently needed, and the development prospect is wide.

Disclosure of Invention

The invention provides a sulfur system color low-pressure variable high-temperature resistant NBR rubber compound and a preparation method thereof aiming at the problems.

In order to achieve the purpose, the invention provides the following technical scheme: the sulfur system color low-pressure variable high-temperature resistant NBR rubber compound comprises the following components in percentage by weight:

44.0-50.0% of nitrile rubber

15.0 to 21.0 percent of light-color reinforcing agent

21.0 to 27.0 percent of light-color filler

0.8 to 1.5 percent of anti-aging agent

3.0 to 6.0 percent of other compounding agents

2.5 to 5.0 percent of vulcanization accelerator.

In particular, the other complexing agent is a mixture of zinc oxide, stearic acid and a processing aid and a color masterbatch.

As a further improvement of the embodiment of the invention, the sulfur system color low-pressure variable high-temperature resistant NBR rubber compound comprises the following components in percentage by weight:

45.0 to 47.0 percent of nitrile rubber

16.0 to 18.0 percent of light-color reinforcing agent

23.0 to 25.0 percent of light-color filler

1.0 to 1.5 percent of antiager

4.0 to 5.0 percent of other compounding agents

3.5 to 4.5 percent of vulcanization accelerator.

Wherein the nitrile rubber is a mixture of PERBUNN 2845F and PERBUNN 3446F. The NBR rubber has good heat resistance and oil resistance, and is suitable for high temperature resistant, medium resistant and low pressure variable products, such as oil pipes, gaskets, oil seals and the like.

The light color reinforcing agent is ZJ-355 and basic white carbon black SODASIL P95. ZJ-355 imparts good strength to the compound, but if too large an amount is used, it tends to result in increased compression set. The alkaline white carbon black SODASIL P95 endows the rubber material with good elasticity and low pressure change, and can promote the vulcanization of the rubber material, compared with the common white carbon black, SODASIL P95 is a key material for reducing the compression permanent deformation of the colored rubber material.

The light-colored filler is a mixture of PF216 and R103. PF216 is diatomite with a special structure, has unique structural characteristics, can remarkably reduce the compression permanent deformation of rubber while improving the strength, can endow the rubber with good physical properties and rebound resilience, and improves the edge tearing performance of a product.

The anti-aging agent is a mixture of anti-aging agents NAUGARD 445 and ZMTI. The 2 kinds of anti-aging agents are matched, so that the anti-aging agent has a lasting protection effect, and the requirement of the product on heat air aging resistance and compression permanent deformation reduction at high temperature can be further improved by pumping out heat-resistant oil.

The processing aid is a mixture of a processing aid WB222, a processing aid 935P and a processing aid PEG 4000; the color master batch is R111A 2.

The vulcanization accelerator is a mixture of S-80E, TMTD-75E, CBS-80E, TETD-80E and PVI.

On the other hand, the embodiment of the invention also provides a preparation method of the sulfur system color low-pressure variable high-temperature resistant NBR rubber compound, which comprises the following preparation steps according to the performance requirement characteristics of the formula.

(1) Preparing materials, wherein according to the whole formula and the mixing characteristic of the nitrile rubber, the preparation sequence is as follows:

sequentially comprising nitrile rubber, an anti-aging agent, other accessory ingredients, a light-color reinforcing agent, light-color filler and a vulcanization accelerator;

(2) firstly, mixing, namely putting the nitrile rubber, the anti-aging agent and other ingredients into an internal mixer for mixing for 60 s; firstly, putting a light-color reinforcing agent into an internal mixer, mixing for 120-180 s, then cleaning an upper top plug, then putting a light-color filler, mixing for 60-90 s, then discharging and discharging a sheet to prepare a rubber compound A for later use;

(3) and (3) mixing the rubber compound A for 60-80 seconds, cleaning, mixing for 30-60 seconds again, and discharging the sheet for later use after sufficient mixing and dispersion.

The rubber adopts the PERBUAN 2845F and the PERBUAN 3446F as main rubber, has the characteristics of good heat resistance and medium resistance, and has the advantages of good pressure deformation performance and low mold pollution. The most outstanding performance of the product is that the product has good elasticity, excellent pressure-variable performance and heat resistance, high vulcanization efficiency and extremely low mold pollution tendency on the premise of giving consideration to physical properties and oil resistance; in addition, the sulfur system color low-pressure variable high-temperature resistant NBR compound rubber adopts a sulfur vulcanization system, compared with a peroxide vulcanization system, the sulfur system color low-pressure variable high-temperature resistant NBR compound rubber has the advantages of short required vulcanization time, good product edge tearing performance, high production efficiency and obvious economic benefit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to achieve the purpose, the invention provides the following technical scheme: the sulfur system color low-pressure variable high-temperature resistant NBR rubber compound comprises the following components in percentage by weight:

44.0-50.0% of nitrile rubber

15.0 to 21.0 percent of light-color reinforcing agent

21.0 to 27.0 percent of light-color filler

0.8 to 1.5 percent of anti-aging agent

3.0 to 6.0 percent of other compounding agents

2.5 to 5.0 percent of vulcanization accelerator.

Other complexing agents are, in particular, zinc oxide, stearic acid and processing aids and color masterbatches.

Preferably, the sulfur system color low-pressure variable high-temperature resistant NBR rubber compound comprises the following components in percentage by weight:

45.0 to 47.0 percent of nitrile rubber

16.0 to 18.0 percent of light-color reinforcing agent

23.0 to 25.0 percent of light-color filler

1.0 to 1.5 percent of antiager

4.0 to 5.0 percent of other compounding agents

3.5 to 4.5 percent of vulcanization accelerator.

The nitrile rubbers are available under the trademark PERBUN 2845F and PERBUN 3446F. The NBR rubber has good heat resistance and oil resistance, and is suitable for high temperature resistant, medium resistant and low pressure variable products, such as oil pipes, gaskets, oil seals and the like.

The raw rubber is selected to be used together with the PERBUAN 2845F and the PERBUAN 3446F, the unique catalyst synthesis characteristics of the raw rubber are fully utilized, and under the same vulcanization system, higher crosslinking density can be obtained.

The light color reinforcing agent is ZJ-355 and basic white carbon black SODASIL P95. ZJ-355 imparts good strength to the compound, but too much is used, which tends to result in increased compression set. The basic white carbon black SODASIL P95 is a basic component, can promote vulcanization, has unique structural characteristics, can endow rubber materials with good elasticity and low pressure change, and is a key material for reducing the compression permanent deformation of the colored rubber materials compared with common white carbon black SODASIL P95.

The light-colored filler is a mixture of PF216 and R103, the PF216 is diatomite with a special structure, and the special structural characteristics of the diatomite can obviously reduce the compression permanent deformation of the rubber while improving the strength, so that the rubber can have good physical properties and rebound resilience, and the edge tearing performance of the product is improved.

The anti-aging agent is a mixture of anti-aging agents NAUGARD 445 and ZMTI. The 2 kinds of anti-aging agents are matched, so that the anti-aging agent has a lasting protection effect, and the requirement of the product on heat air aging resistance and compression permanent deformation reduction at high temperature can be further improved by pumping out heat-resistant oil.

The processing aid is a mixture of processing aid WB222, processing aid 935P and processing aid PEG 4000; the color master batch is R111A 2.

The vulcanization accelerator is a mixture of S-80E, TMTD-75E, CBS-80E, TETD-80E and PVI.

The sulfur system color low-pressure change high-temperature resistant NBR compound rubber related to the invention is manufactured according to the following steps.

Preparing the glue, accurately weighing the raw materials in sequence according to the proportion in the table 1, and standing for later use.

Firstly, mixing, namely putting the nitrile rubber, the anti-aging agent and other ingredients into an internal mixer for mixing for 60 s; firstly, putting a light-color reinforcing agent into an internal mixer, mixing for 120-180 s, then cleaning an upper top plug, then putting a light-color filler, mixing for 60-90 s, then discharging and discharging a sheet to prepare a rubber compound A for later use;

and (3) mixing the rubber compound A for 60-80 seconds, cleaning, mixing for 30-60 seconds again, and discharging the sheet for later use after sufficient mixing and dispersion.

Table 1 shows the mixing ratios of the components in examples 1 to 4 in terms of mass fractions.

TABLE 1

Table 2 shows the mixing ratios of the other compounding ingredients of examples 1 to 4 in terms of mass fraction

TABLE 2

Table 3 shows the blending ratio of the anti-aging agents of examples 1 to 4 in terms of mass fraction

TABLE 3

Wherein the processing aid is a mixture of processing aid WB222, processing aid 935P and processing aid PEG4000, and the mass fraction of the processing aids of examples 1-4 is shown in Table 4.

TABLE 4

Table 5 shows the kneading times of examples 1 to 4.

TABLE 5

Table 6 shows the performance parameters of the sulfur-based color low-pressure change high-temperature NBR compounds prepared in examples 1 to 4.

TABLE 6

As can be seen from Table 6, the sulfur system color low-pressure change high-temperature resistant NBR compound of the invention has the following characteristics: firstly, the rubber takes the combination of PERBUNAN 2845F and PERBUNAN 3446F as main rubber, has the properties of high temperature resistance, low temperature resistance, medium resistance and oil resistance, has good pressure deformation performance, and ensures the service life of products. The four formulas of the embodiment all meet the requirements of technical parameters of products, and the formula of the embodiment 3 has the optimal performance, because the rubber content is moderate, and the vulcanization system and the protection system are properly matched, the four formulas not only meet the requirements of the technical parameters of the products, but also have better performance advantages. On the premise of meeting other physical property requirements, a matching scheme with optimal cost performance can be reasonably selected according to the price change of the reinforcing filler and the softening agent.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.