阅读说明：本技术 一种耐磨改性橡胶密封材料 (Wear-resistant modified rubber sealing material ) 是由 徐向远 于 2020-11-21 设计创作，主要内容包括：本发明公开了一种耐磨改性橡胶密封材料,制备的密封材料不仅具有较为优越的耐磨性能,同时,其抗变形能力和拉伸性能较好,制得推广。利用改性蛭石和硅藻土、乙二胺等制备的改性填料,可以大大提高所得目标材料的耐磨性能,同时,其在橡胶基底中的相容性良好,提升了材料的拉伸性能和压缩性能；首先,利用小孽碱、碳酸氢钠、壳聚糖对蛭石进行处理可以激活蛭石表面活性,增强其吸附性能,接着利用天冬氨酸对其进行改性,使其富含氨基、羧基、羟基,增强其反应性能和与基底的相容性与界面结合性,提升材料的力学性能。(The invention discloses a wear-resistant modified rubber sealing material which has excellent wear resistance, good deformation resistance and good tensile property, and is popularized. The modified filler prepared by utilizing the modified vermiculite, the diatomite, the ethylenediamine and the like can greatly improve the wear resistance of the obtained target material, and meanwhile, the modified filler has good compatibility in a rubber substrate, so that the tensile property and the compression property of the material are improved; firstly, vermiculite is treated by using small bad base, sodium bicarbonate and chitosan to activate the surface activity of the vermiculite and enhance the adsorption performance of the vermiculite, and then the vermiculite is modified by using aspartic acid to be rich in amino, carboxyl and hydroxyl, so that the reactivity, the compatibility with a substrate and the interface binding property of the material are enhanced, and the mechanical property of the material is improved.)

1. The wear-resistant modified rubber sealing material is characterized by being prepared from the following raw materials in parts by weight:

10-15 parts of modified filler, 80-120 parts of natural rubber, 5-7 parts of polyvinyl alcohol, 20-30 parts of nitrile rubber, 5-10 parts of aramid fiber, 5-8 parts of stearic acid and 2-3 parts of sulfur.

2. The wear-resistant modified rubber sealing material as claimed in claim 1, which is prepared by the following steps:

(1) adding the modified filler and the natural rubber into a mixing roll together, and mixing to obtain modified natural rubber;

(2) mixing the obtained modified natural rubber with polyvinyl alcohol, nitrile rubber and aramid fiber at the temperature of 110-120 ℃ for 20-30min, adding stearic acid and sulfur, continuously mixing for 3-5min at the temperature of 60-64 ℃, and then carrying out extrusion molding.

3. The wear-resistant modified rubber sealing material as claimed in claim 1, wherein the aramid fiber is treated by: baking aramid fiber at 30-40 ℃ for 10-20min, spraying a mixed solution of benzyl acetate, limonene and sodium bicarbonate, stirring the aramid fiber while spraying, freezing the obtained aramid fiber at 0-minus 5 ℃ for 30-40min, soaking the aramid fiber in warm water at 50-60 ℃, stirring at 100-120rpm for 13-20min, filtering, and drying at 30-40 ℃.

4. The wear-resistant modified rubber sealing material as claimed in claim 1, wherein the modified filler is prepared by a method comprising the following steps:

(1) putting 5-10 parts by weight of vermiculite into liquid nitrogen, standing for 10-20min, taking out, performing ball milling for 20-30min, adding 20-30 parts of mixed solution of oligomenate alkali, sodium bicarbonate and chitosan, continuing ball milling for 30-40min, removing a solvent, putting the obtained product into a roasting furnace, roasting for 2-3h at the temperature of 300-340 ℃, then reducing the temperature to room temperature at the speed of 3-4 ℃/min, adding 20-30 parts of ethanol and 4-6 parts of aspartic acid into the obtained product, and performing ball milling until the ethanol is removed to obtain modified vermiculite;

(2) adding 5-10 parts of diatomite into an ethanol solution, carrying out ultrasonic treatment for 30-40min under the ultrasonic condition of 46-48KHz, then adding 1-2 parts of ethylenediamine and 0.5-1 part of sodium tetraborate, continuing ultrasonic treatment for 20-30min, then adding the modified vermiculite obtained in the step (1) into the obtained system, uniformly dispersing, transferring into a reaction kettle, reacting for 10-15h at the temperature of 130-.

5. The wear-resistant modified rubber sealing material of claim 3, wherein the solvent in the mixed solution of benzyl acetate, limonene and sodium bicarbonate is ethanol, and each 100g of ethanol contains 2-4g of benzyl acetate, 1-1.5g of limonene and 3-5g of sodium bicarbonate.

6. The wear-resistant modified rubber sealing material as claimed in claim 4, wherein in the mixed solution of the oligotillering alkali, the sodium bicarbonate and the chitosan in the step (1), per 100g of deionized water contains 0.4-0.8g of oligotillering alkali, 5-10g of sodium bicarbonate and 3-8g of chitosan.

Technical Field

The invention belongs to the technical field of sealing materials, and particularly relates to a wear-resistant modified rubber sealing material.

Background

The rubber composite sealing material has excellent compression resilience, excellent creep relaxation resistance, excellent matching property with a sealing surface and long-term pressure sealing performance, and is widely applied to the sealing field of pipelines, chemical pumps and magnetic pumps at present, but the further development of the rubber composite sealing material in the sealing field is severely restricted due to poor wear resistance and poor impact strength.

Disclosure of Invention

In view of the above problems, the present invention aims to provide a wear-resistant modified rubber sealing material.

The invention is realized by the following technical scheme:

a wear-resistant modified rubber sealing material is prepared from the following raw materials in parts by weight:

10-15 parts of modified filler, 80-120 parts of natural rubber, 5-7 parts of polyvinyl alcohol, 20-30 parts of nitrile rubber, 5-10 parts of aramid fiber, 5-8 parts of stearic acid and 2-3 parts of sulfur.

Further, the preparation method comprises the following steps:

(1) adding the modified filler and the natural rubber into a mixing roll together, and mixing to obtain modified natural rubber;

(2) mixing the obtained modified natural rubber with polyvinyl alcohol, nitrile rubber and aramid fiber at the temperature of 110-120 ℃ for 20-30min, adding stearic acid and sulfur, continuously mixing for 3-5min at the temperature of 60-64 ℃, and then carrying out extrusion molding.

Further, the aramid fiber is treated by the following steps: baking aramid fiber at 30-40 ℃ for 10-20min, spraying a mixed solution of benzyl acetate, limonene and sodium bicarbonate, stirring the aramid fiber while spraying, freezing the obtained aramid fiber at 0-minus 5 ℃ for 30-40min, soaking the aramid fiber in warm water at 50-60 ℃, stirring at 100-120rpm for 13-20min, filtering, and drying at 30-40 ℃.

Further, the preparation method of the modified filler comprises the following steps:

(1) putting 5-10 parts by weight of vermiculite into liquid nitrogen, standing for 10-20min, taking out, performing ball milling for 20-30min, adding 20-30 parts of mixed solution of oligomenate alkali, sodium bicarbonate and chitosan, continuing ball milling for 30-40min, removing a solvent, putting the obtained product into a roasting furnace, roasting for 2-3h at the temperature of 300-340 ℃, then reducing the temperature to room temperature at the speed of 3-4 ℃/min, adding 20-30 parts of ethanol and 4-6 parts of aspartic acid into the obtained product, and performing ball milling until the ethanol is removed to obtain modified vermiculite; the vermiculite is treated by using small bad alkali, sodium bicarbonate and chitosan, so that the surface activity of the vermiculite can be activated, the adsorption performance of the vermiculite is enhanced, and the vermiculite is modified by using aspartic acid, so that the vermiculite is rich in amino, carboxyl and hydroxyl, the reaction performance, the compatibility with a substrate and the interface binding property of the vermiculite are enhanced, and the mechanical property of the material is improved;

(2) adding 5-10 parts of diatomite into an ethanol solution, carrying out ultrasonic treatment for 30-40min under the ultrasonic condition of 46-48KHz, then adding 1-2 parts of ethylenediamine and 0.5-1 part of sodium tetraborate into the ethanol solution, continuing to carry out ultrasonic treatment for 20-30min, then adding the modified vermiculite obtained in the step (1) into the obtained system, uniformly dispersing the modified vermiculite, transferring the mixture into a reaction kettle, reacting for 10-15h at the temperature of 130-; the diatomite, the ethylenediamine and the sodium tetraborate are mixed to further modify the vermiculite, and the abundant functional groups on the surface of the vermiculite can perform a complex reaction with the ethylenediamine and the sodium tetraborate, so that the diatomite and the modified vermiculite are organically combined to form a compact network structure;

furthermore, in the mixed solution of benzyl acetate, limonene and sodium bicarbonate, the solvent is ethanol, wherein each 100g of ethanol contains 2-4g of benzyl acetate, 1-1.5g of limonene and 3-5g of sodium bicarbonate.

Furthermore, in the mixed solution of the small tillering alkali, the sodium bicarbonate and the chitosan in the step (1), every 100g of deionized water contains 0.4-0.8g of the small tillering alkali, 5-10g of the sodium bicarbonate and 3-8g of the chitosan.

The invention has the beneficial effects that: the sealing material prepared by the invention not only has superior wear resistance, but also has good deformation resistance and tensile property, and is popularized. The modified filler prepared by utilizing the modified vermiculite, the diatomite, the ethylenediamine and the like can greatly improve the wear resistance of the obtained target material, and meanwhile, the modified filler has good compatibility in a rubber substrate, so that the tensile property and the compression property of the material are improved; firstly, vermiculite is treated by using small bad alkali, sodium bicarbonate and chitosan to activate the surface activity of the vermiculite and enhance the adsorption performance of the vermiculite, then aspartic acid is used for modifying the vermiculite to ensure that the vermiculite is rich in amino, carboxyl and hydroxyl, the reaction performance, the compatibility with a substrate and the interface binding property of the vermiculite are enhanced, the mechanical property of the material is improved, then the vermiculite is further modified after being mixed by using diatomite, ethylenediamine and sodium tetraborate, and the abundant functional groups on the surface of the vermiculite are subjected to complex reaction with ethylenediamine and sodium tetraborate, so that the diatomite and the modified vermiculite are organically combined to form a compact network structure, and the organic functional groups on the surface of the vermiculite are numerous and are more tightly combined with the substrate, thereby the wear resistance and the mechanical property of the obtained material are remarkably improved.

Detailed Description

The invention is illustrated by the following specific examples, which are not intended to be limiting.

Example 1

A wear-resistant modified rubber sealing material is prepared from the following raw materials in parts by weight:

10 parts of modified filler, 80 parts of natural rubber, 5 parts of polyvinyl alcohol, 20 parts of nitrile rubber, 5 parts of aramid fiber, 5 parts of stearic acid and 2 parts of sulfur.

Further, the preparation method comprises the following steps:

(1) adding the modified filler and the natural rubber into a mixing roll together, and mixing to obtain modified natural rubber;

(2) mixing the obtained modified natural rubber with polyvinyl alcohol, nitrile rubber and aramid fiber at 110 ℃ for 20min, adding stearic acid and sulfur, continuously mixing at 60 ℃ for 3min, and then extruding and molding.

Further, the aramid fiber is treated by the following steps: baking aramid fiber at 30 ℃ for 10min, spraying a mixed solution of benzyl acetate, limonene and baking soda, stirring the aramid fiber while spraying, freezing the obtained aramid fiber at 0 ℃ for 30min, soaking the aramid fiber in warm water at 50 ℃, stirring at 100rpm for 13min, filtering, and drying at 30 ℃.

Further, the preparation method of the modified filler comprises the following steps:

(1) putting 5 parts of vermiculite by weight into liquid nitrogen, standing for 10min, taking out, carrying out ball milling for 20min, adding 20 parts of mixed solution of small alkali, sodium bicarbonate and chitosan, wherein each 100g of deionized water contains 0.4g of small alkali, 5g of sodium bicarbonate and 3g of chitosan, continuing ball milling for 30min, removing a solvent, putting the obtained product into a roasting furnace, roasting for 2h at 300 ℃, then cooling to room temperature at the speed of 3 ℃/min, adding 20 parts of ethanol and 4 parts of aspartic acid into the obtained product, and carrying out ball milling until the ethanol is removed to obtain the modified vermiculite;

(2) adding 5 parts of diatomite into an ethanol solution, carrying out ultrasonic treatment for 30min under the ultrasonic condition of 46KHz, then adding 1 part of ethylenediamine and 0.5 part of sodium tetraborate, continuing to carry out ultrasonic treatment for 20min, then adding the modified vermiculite obtained in the step (1) into the obtained system, transferring the mixture into a reaction kettle after uniform dispersion, reacting for 10h at 130 ℃ and 0.2MPa, then cooling, and filtering to obtain the modified filler.

Furthermore, in the mixed solution of benzyl acetate, limonene and sodium bicarbonate, the solvent is ethanol, wherein each 100g of ethanol contains 2g of benzyl acetate, 1g of limonene and 3g of sodium bicarbonate.

Further, in the mixed solution of the small bad base, the sodium bicarbonate and the chitosan in the step (1),

example 2

A wear-resistant modified rubber sealing material is prepared from the following raw materials in parts by weight:

modified filler 12, natural rubber 100, polyvinyl alcohol 6, nitrile rubber 25, aramid fiber 7, stearic acid 6 and sulfur 3.

Further, the preparation method comprises the following steps:

(1) adding the modified filler and the natural rubber into a mixing roll together, and mixing to obtain modified natural rubber;

(2) mixing the obtained modified natural rubber with polyvinyl alcohol, nitrile rubber and aramid fiber at 115 ℃ for 25min, adding stearic acid and sulfur, continuously mixing at 62 ℃ for 4min, and then extruding and molding.

Further, the aramid fiber is treated by the following steps: baking aramid fiber at 35 ℃ for 15min, spraying a mixed solution of benzyl acetate, limonene and baking soda, stirring the aramid fiber while spraying, freezing the obtained aramid fiber at-3 ℃ for 35min after spraying, soaking the aramid fiber in warm water at 55 ℃, stirring at 110rpm for 18min, filtering, and drying at 35 ℃.

Further, the preparation method of the modified filler comprises the following steps:

(1) putting 7 parts by weight of vermiculite into liquid nitrogen, standing for 15min, taking out, carrying out ball milling for 25min, adding 25 parts of mixed solution of small alkali, sodium bicarbonate and chitosan, wherein each 100g of deionized water contains 0.6g of small alkali, 7g of sodium bicarbonate and 5g of chitosan, continuing ball milling for 35min, removing a solvent, putting the obtained product into a roasting furnace, roasting for 3h at 320 ℃, cooling to room temperature at a speed of 4 ℃/min, adding 25 parts of ethanol and 5 parts of aspartic acid into the obtained product, and carrying out ball milling until the ethanol is removed to obtain the modified vermiculite;

(2) adding 8 parts of diatomite into an ethanol solution, carrying out ultrasonic treatment for 35min under the ultrasonic condition of 47KHz, then adding 2 parts of ethylenediamine and 0.8 part of sodium tetraborate, continuing to carry out ultrasonic treatment for 25min, then adding the modified vermiculite obtained in the step (1) into the obtained system, transferring the mixture into a reaction kettle after uniform dispersion, reacting for 13h at 135 ℃ and 0.22MPa, then cooling, and filtering to obtain the modified filler.

Furthermore, in the mixed solution of benzyl acetate, limonene and sodium bicarbonate, the solvent is ethanol, wherein each 100g of ethanol contains 3g of benzyl acetate, 1.2g of limonene and 4g of sodium bicarbonate.

Example 3

A wear-resistant modified rubber sealing material is prepared from the following raw materials in parts by weight:

15 modified filler, 120 natural rubber, 7 polyvinyl alcohol, 30 nitrile rubber, 10 aramid fiber, 8 stearic acid and 3 sulfur.

Further, the preparation method comprises the following steps:

(1) adding the modified filler and the natural rubber into a mixing roll together, and mixing to obtain modified natural rubber;

(2) mixing the obtained modified natural rubber with polyvinyl alcohol, nitrile rubber and aramid fiber at 120 ℃ for 30min, adding stearic acid and sulfur, continuously mixing at 64 ℃ for min, and then extruding and molding.

Further, the aramid fiber is treated by the following steps: baking aramid fiber at 40 ℃ for 20min, spraying a mixed solution of benzyl acetate, limonene and baking soda, stirring the aramid fiber while spraying, freezing the obtained aramid fiber at-5 ℃ for 40min after spraying, soaking the aramid fiber in warm water at 60 ℃, stirring at 120rpm for 20min, filtering, and drying at 40 ℃.

Further, the preparation method of the modified filler comprises the following steps:

(1) putting 10 parts by weight of vermiculite into liquid nitrogen, standing for 20min, taking out, performing ball milling for 30min, adding 30 parts of mixed solution of sodium carbonate, sodium bicarbonate and chitosan, wherein each 100g of deionized water contains 0.8g of sodium carbonate, 10g of sodium bicarbonate and 8g of chitosan, continuing ball milling for 40min, removing a solvent, putting the obtained product into a roasting furnace, roasting for 3h at 340 ℃, cooling to room temperature at a speed of 4 ℃/min, adding 30 parts of ethanol and 6 parts of aspartic acid into the obtained product, and performing ball milling until the ethanol is removed to obtain the modified vermiculite;

(2) adding 10 parts of diatomite into an ethanol solution, carrying out ultrasonic treatment for 40min under the ultrasonic condition of 48KHz, then adding 2 parts of ethylenediamine and 1 part of sodium tetraborate, continuing to carry out ultrasonic treatment for 30min, then adding the modified vermiculite obtained in the step (1) into the obtained system, transferring the mixture into a reaction kettle after uniform dispersion, reacting for 15h at 140 ℃ and 0.24MPa, then cooling, and filtering to obtain the modified filler.

Furthermore, in the mixed solution of benzyl acetate, limonene and sodium bicarbonate, the solvent is ethanol, wherein each 100g of ethanol contains 4g of benzyl acetate, 1.5g of limonene and 5g of sodium bicarbonate.

Comparative example 1

The procedure is the same as in example 2 except that the modified filler is not added.

Comparative example 2

This comparative example is the same as example 2 except that the modified vermiculite was replaced with untreated vermiculite.

Comparative example 3

This comparative example is identical to example 2 except that the procedure was the same except that the addition of diatomaceous earth was omitted.

Comparative example 4

In this comparative example, the treatment step of the aramid fiber was omitted as compared with example 2, and the steps of the method were the same except for this.

And (3) performance testing:

the abrasion resistance of the samples obtained by the various groups of examples and comparative examples is tested by an Akron abrasion test;

the compression set was tested according to GB/T7759-2015 standard, the experimental temperature was 70 ℃ for 70 h.

The test results are shown in table 1:

TABLE 1

As can be seen from Table 1, the sealing material prepared by the invention not only has relatively excellent wear resistance, but also has relatively good deformation resistance and tensile property, and is popularized.