阅读说明：本技术 一种耐热型密封圈及其成型工艺 (Heat-resistant sealing ring and forming process thereof ) 是由 田书洪 何文军 于 2021-06-11 设计创作，主要内容包括：本发明公开了一种耐热型密封圈及其成型工艺,首先将三元乙丙橡胶投入混炼机中加热,然后依次加入硫磺以及促进剂、活性剂和催化剂,加热时温度保持在200-230℃,将三元乙丙橡胶加热为熔融状态,然后加入填料后继续加热搅拌,温度保持在170-180℃,转速保持在100-300r/min,然后再依次加入防老剂、增塑剂、增强剂和偶联剂进行加热搅拌混合,获得母胶；然后将上述步骤制备获得的母胶倒入注塑机中。通过采用本发明设计的制备工艺,能够生产出耐热型的密封圈,能够应用在高温下作业,不会轻易的发生融化变形、损坏,进而延长了密封圈的使用寿命,而且通过采用聚烯烃类弹性体作为增强剂,能够使得密封圈具有高的拉伸强度和拉伸伸长率,不会轻易发生断裂的现象。(The invention discloses a heat-resistant sealing ring and a molding process thereof, firstly putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, an accelerator, an activator and a catalyst, heating at the temperature of 200-; and then pouring the masterbatch prepared in the step into an injection molding machine. By adopting the preparation process designed by the invention, the heat-resistant sealing ring can be produced, can be applied to high-temperature operation, cannot be easily subjected to melting deformation and damage, and further prolongs the service life of the sealing ring.)

1. A heat-resistant sealing ring and a forming process thereof are characterized in that: the method comprises the following steps:

weighing the following raw materials in parts by weight:

50-60 parts of ethylene propylene diene monomer

15-30 parts of filler

1-5 parts of sulfur and accelerator

1-3 parts of active agent

2-4 parts of anti-aging agent

0.5-3 parts of plasticizer

20-50 parts of reinforcing agent

5-15 parts of coupling agent

1-1.5 parts of a catalyst;

(II) mixing materials:

firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch;

(III) injection molding preparation:

pouring the masterbatch obtained in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the masterbatch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ by using a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product;

(IV) trimming and detecting:

and (3) performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified without obvious deformation, and the heat-resistant sealing ring is obtained at this moment.

2. A heat-resistant seal ring and a molding process thereof according to claim 1, characterized in that: the filler in the first step is one or more of magnesium hydroxide, calcium carbonate, magnesium carbonate and calcium silicate.

3. A heat-resistant seal ring and a molding process thereof according to claim 1, characterized in that: in the first step, the accelerator M and the accelerator TMTD are mixed in a ratio of 1: 1, and mixing the components in a ratio of 1.

4. A heat-resistant seal ring and a molding process thereof according to claim 1, characterized in that: in the first step, the activating agent is one or more of zinc oxide, zinc carbonate and stearic acid, and the anti-aging agent is one or more of an anti-aging agent MB, an anti-aging agent BLE and an anti-aging agent SP.

5. A heat-resistant seal ring and a molding process thereof according to claim 1, characterized in that: in the first step, the plasticizer adopts epoxy butyl furoate, and the reinforcing agent adopts a polyolefin elastomer.

6. A heat-resistant seal ring and a molding process thereof according to claim 1, characterized in that: in the first step, silane coupling agent KH99 and titanate coupling agent KR-TTS are adopted as coupling agents, and the ratio of 1: 2, and the catalyst is vinyl bis stearamide.

7. A heat-resistant seal ring and a molding process thereof according to claim 1, characterized in that: pressurizing the mold to 160 and 180Kgf/cm in the third step during mold closing²And the product is kept still in the mould for 1-3 hours before being taken out.

Technical Field

The invention relates to the technical field of sealing rings, in particular to a heat-resistant sealing ring and a forming process thereof.

Background

The rubber sealing ring is an annular cover composed of one or more parts, is fixed on one ferrule or gasket of the bearing and is contacted with the other ferrule or gasket or forms a narrow labyrinth gap to prevent the leakage of lubricating oil and the invasion of foreign matters, and the low-hardness rubber sealing ring is widely used in sealing places such as washing machines, refrigerators, automobile air filtration systems and the like; however, the existing sealing ring has poor heat resistance, and is easy to deform and damage in a high-temperature environment for a long time, so that the service life of the sealing ring is shortened.

Disclosure of Invention

The invention aims to provide a heat-resistant sealing ring and a forming process thereof, which are used for solving the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a heat-resistant sealing ring and a forming process thereof comprise the following steps:

weighing the following raw materials in parts by weight:

50-60 parts of ethylene propylene diene monomer

15-30 parts of filler

1-5 parts of sulfur and accelerator

1-3 parts of active agent

2-4 parts of anti-aging agent

0.5-3 parts of plasticizer

20-50 parts of reinforcing agent

5-15 parts of coupling agent

1-1.5 parts of a catalyst;

(II) mixing materials:

firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch;

(III) injection molding preparation:

pouring the masterbatch obtained in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the masterbatch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ by using a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product;

(IV) trimming and detecting:

and (3) performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified without obvious deformation, and the heat-resistant sealing ring is obtained at this moment.

Preferably, the filler in the first step is one or more of magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, calcium oxide and magnesium oxide.

Preferably, the promoter M and the promoter TMTD used in the first step are mixed in a ratio of 1: 1, and mixing the components in a ratio of 1.

Preferably, in the first step, the activating agent is one or more of zinc oxide, zinc carbonate and stearic acid, and the anti-aging agent is one or more of an anti-aging agent MB, an anti-aging agent BLE and an anti-aging agent SP.

Preferably, in the first step, the plasticizer is epoxy butyl furoate, and the reinforcing agent is polyolefin elastomer.

Preferably, in the first step, the coupling agent adopts a silane coupling agent KH99 and a titanate coupling agent KR TTS, and the ratio of the silane coupling agent KH99 to the titanate coupling agent KR TTS is 1: 2 and the catalyst adopts vinyl bis stearamide.

Preferably, the mould in the third step is pressurized to 160-180Kgf/cm during mould closing²And the product is kept still in the mould for 1-3 hours before being taken out.

Compared with the prior art, the invention has the following beneficial effects:

by adopting the preparation process designed by the invention, the heat-resistant sealing ring can be produced, can be applied to operation at high temperature, cannot be easily melted, deformed and damaged, and further prolongs the service life of the sealing ring.

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.

The invention provides a technical scheme that:

a heat-resistant sealing ring and a forming process thereof comprise the following steps:

weighing the following raw materials in parts by weight:

50-60 parts of ethylene propylene diene monomer

15-30 parts of filler

1-5 parts of sulfur and accelerator

1-3 parts of active agent

2-4 parts of anti-aging agent

0.5-3 parts of plasticizer

20-50 parts of reinforcing agent

5-15 parts of coupling agent

1-1.5 parts of a catalyst;

(II) mixing materials:

firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch;

(III) injection molding preparation:

pouring the masterbatch obtained in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the masterbatch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ by using a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product;

(IV) trimming and detecting:

and (3) performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified without obvious deformation, and the heat-resistant sealing ring is obtained at this moment.

The first embodiment is as follows:

firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch; pouring the master batch prepared in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the master batch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ through a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product; and finally, performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified if no obvious deformation occurs, and the heat-resistant sealing ring is obtained at this moment.

Example two:

in the first embodiment, the following steps are added:

the filler in the first step is one or more of magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, calcium oxide and magnesium oxide.

Firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch; pouring the master batch prepared in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the master batch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ through a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product; and finally, performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified if no obvious deformation occurs, and the heat-resistant sealing ring is obtained at this moment.

Example three:

in the second embodiment, the following steps are added:

in the first step, the accelerator M and the accelerator TMTD are mixed in a proportion of 1: 1, and mixing the components in a ratio of 1.

Firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch; pouring the master batch prepared in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the master batch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ through a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product; and finally, performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified if no obvious deformation occurs, and the heat-resistant sealing ring is obtained at this moment.

Example four:

in the third embodiment, the following steps are added:

in the first step, the activating agent is one or more of zinc oxide, zinc carbonate and stearic acid, and the anti-aging agent is one or more of an anti-aging agent MB, an anti-aging agent BLE and an anti-aging agent SP.

Firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch; pouring the master batch prepared in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the master batch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ through a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product; and finally, performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified if no obvious deformation occurs, and the heat-resistant sealing ring is obtained at this moment.

Example five:

in the fourth example, the following steps were added:

in the first step, the plasticizer adopts epoxy butyl furoate, and the reinforcing agent adopts a polyolefin elastomer.

Firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch; pouring the master batch prepared in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the master batch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ through a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product; and finally, performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified if no obvious deformation occurs, and the heat-resistant sealing ring is obtained at this moment.

Example six:

in the fifth example, the following steps were added:

in the first step, silane coupling agent KH99 and titanate coupling agent KR-TTS are adopted as coupling agents, and the ratio of 1: 2 and the catalyst adopts vinyl bis stearamide.

Firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch; pouring the master batch prepared in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the master batch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ through a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product; and finally, performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified if no obvious deformation occurs, and the heat-resistant sealing ring is obtained at this moment.

Example seven:

in example six, the following steps were added:

pressurizing the mold to 160-180Kgf/cm during mold closing²And the product is kept still in the mould for 1-3 hours before being taken out.

Firstly, putting ethylene propylene diene monomer rubber into a mixing roll for heating, then sequentially adding sulfur, a promoter, an activator and a catalyst, keeping the temperature at 230 ℃ during heating, heating the ethylene propylene diene monomer rubber to a molten state, then adding a filler, continuing to heat and stir, keeping the temperature at 180 ℃ at 170 ℃ and keeping the rotating speed at 300r/min, and then sequentially adding an anti-aging agent, a plasticizer, a reinforcing agent and a coupling agent for heating, stirring and mixing to obtain a master batch; pouring the master batch prepared in the step into an injection molding machine, heating the mold to 170-180 ℃ by using a vacuum flat vulcanizing machine, injecting the master batch into the mold through the injection molding machine, closing the mold for vulcanizing for 4-6min, cooling the mold to 40-50 ℃ through a cooling system, preserving heat for 15-30min, cooling to room temperature, opening the mold and taking out a product; and finally, performing trimming treatment on the product prepared in the step, then putting the product into a heating furnace for detection, wherein the temperature of the heating furnace is kept at 70-90 ℃ during product detection, the time is kept at 10-15min, the product is qualified if no obvious deformation occurs, and the heat-resistant sealing ring is obtained at this moment.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.