Food-grade wading rubber sealing rubber ring and preparation process thereof

Abstract

The invention relates to the technical field of rubber sealing rings, in particular to a food-grade wading rubber sealing ring and a preparation process thereof.The rubber sealing ring is prepared from, by weight, 50-80 parts of silicone rubber, 30-40 parts of fluororubber, 16-18 parts of a reinforcing agent, 8-12 parts of a wear-resistant agent, 5-10 parts of an anti-aging agent, 1-5 parts of a vulcanizing agent, 1-3 parts of an accelerant and 1-3 parts of a coupling agent. The reinforcing agent is prepared by mixing plant carbon black powder and silica powder, and the weight ratio of the plant carbon black powder to the silica powder is 2: 1; by adding the reinforcing agent, the self strength of the rubber sealing ring can be enhanced, the compression resistance of the rubber sealing ring can be enhanced, and by adding the wear-resistant agent, the wear resistance of the rubber sealing ring can be enhanced, so that the service life of the rubber sealing ring can be prolonged; in addition, the main raw materials of the reinforcing agent, the wear-resistant agent and the anti-aging agent with relatively large weight parts in the additive are food-grade, so that the prepared rubber sealing ring is food-grade and is more environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of rubber sealing rings, in particular to a food-grade water-resistant rubber sealing ring and a preparation process thereof. Background Art

[0002] Rubber sealing rings are widely used in water pipe connections. They have good elasticity and sealing properties, can prevent water leakage, and can improve the connection strength to a certain extent. In order to respond to the national call for energy conservation and environmental protection, food-grade rubber sealing rings are becoming more and more popular. Although food-grade rubber sealing rings are more environmentally friendly than industrial synthetic rubber sealing rings, food-grade rubber sealing rings themselves have relatively poor strength. For example, their pressure resistance and wear resistance are not as good as industrial synthetic rubber, so there is room for improvement. Summary of the invention

[0003] The object of the present invention is to provide a food-grade water-resistant rubber sealing ring and a preparation process thereof, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A food-grade water-resistant rubber sealing ring, comprising the following raw materials in parts by weight: 50-80 parts of silicone rubber, 30-40 parts of fluororubber, 16-18 parts of reinforcing agent, 8-12 parts of anti-aging agent, 5-10 parts of anti-aging agent, 1-5 parts of vulcanizing agent, 1-3 parts of accelerator and 1-3 parts of coupling agent.

[0005] Furthermore, the reinforcing agent is prepared by mixing plant carbon black powder and silica powder, and the weight ratio of the plant carbon black powder to the silica powder is 2:1.

[0006] Furthermore, the wear-resistant agent is prepared by mixing polyoxymethylene powder and silica powder, and the weight ratio of polyoxymethylene powder to silica powder is 1:1.

[0007] Furthermore, the antioxidant is made of butylated hydroxytoluene.

[0008] Furthermore, the vulcanizing agent is a mixture of diisopropylbenzene peroxide, di-tert-butyl diisopropylbenzene peroxide and 2,4-dichlorobenzoyl peroxide in a weight ratio of 2:1:1.

[0009] Furthermore, the accelerator is a mixture of 2-mercaptobenzothiazole, N-cyclohexyl-2-benzothiazole sulfenamide and tetramethylthiuram disulfide in a weight ratio of 1:2:1.

[0010] Furthermore, the coupling agent is made of phenyltriethoxysilane.

[0011] A preparation process of a food-grade water-resistant rubber sealing ring comprises the following steps: Step 1: Add silicone rubber and fluororubber according to the weight of the constituent raw materials into an internal mixer and plasticize for 6-10 minutes at a temperature of 200-300°C; Step 2: Then add the reinforcing agent, anti-wear agent, anti-aging agent, accelerator and coupling agent according to the weight of the constituent raw materials into the internal mixer and mix for 40-50 minutes at a temperature of 105-125°C; Step 3: After mixing, the rubber material is pressed into shape, and the molded rubber material is added into a mold in a vulcanizing device, and a vulcanizing agent is added according to the weight of the raw materials for vulcanization treatment for 10-20 minutes at a temperature of 160-200°C, thereby obtaining a food-grade water-resistant rubber sealing ring.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The food-grade water-resistant rubber sealing ring and its preparation process can enhance the inherent strength of the rubber sealing ring and the compression resistance of the rubber sealing ring by adding a reinforcing agent, and enhance the wear resistance of the rubber sealing ring by adding a wear-resistant agent, thereby enhancing the service life of the rubber sealing ring; in addition, the main raw materials of the rubber sealing ring prepared by the present application, silicone rubber and fluororubber, are both food-grade rubbers, and the main raw materials of the reinforcing agent, wear-resistant agent and antioxidant, which have a larger weight proportion in the additives, are all food-grade, so that the prepared rubber sealing ring is food-grade and more environmentally friendly. DETAILED DESCRIPTION

[0013] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] The present invention provides a technical solution: A food-grade water-resistant rubber sealing ring, comprising the following raw materials in parts by weight: 50-80 parts of silicone rubber, 30-40 parts of fluororubber, 16-18 parts of reinforcing agent, 8-12 parts of anti-aging agent, 5-10 parts of anti-aging agent, 1-5 parts of vulcanizing agent, 1-3 parts of accelerator and 1-3 parts of coupling agent.

[0015] Silicone rubber and fluororubber are both main raw materials for food grade rubber.

[0016] The reinforcing agent in the present application is made by mixing plant carbon black powder and silica powder, and the weight ratio of plant carbon black powder to silica powder is 2:1; after the addition of plant carbon black powder and silica powder, the strength, hardness and wear resistance of the rubber sealing ring itself can be enhanced, making the reinforced rubber sealing ring more resistant to extrusion and tension.

[0017] In addition, plant carbon black powder and silica powder are both food grade additives.

[0018] The wear-resistant agent in the present application is made by mixing polyoxymethylene powder and silica powder, and the weight ratio of polyoxymethylene powder to silica powder is 1:1; the addition of polyoxymethylene powder and silica powder can greatly enhance the wear resistance of the rubber sealing ring itself, and the wear resistance is greatly improved compared with the existing rubber sealing ring, and it is not allowed to be damaged by wear and tear, thereby increasing the service life of the rubber sealing ring.

[0019] In addition, polyoxymethylene powder and silica powder are both food grade additives.

[0020] The antioxidant in the present application is made of butylated hydroxytoluene. The addition of butylated hydroxytoluene can enhance the anti-aging performance of the rubber sealing ring, making it less likely for some water-related rubber sealing rings to age, thereby greatly increasing the service life of the water-related rubber sealing rings.

[0021] In addition, butylated hydroxytoluene is a food grade additive.

[0022] Furthermore, the vulcanizing agent is a mixture of diisopropylbenzene peroxide, di-tert-butyl diisopropylbenzene peroxide and 2,4-dichlorobenzoyl peroxide in a weight ratio of 2:1:1.

[0023] The addition of the vulcanizing agent during preparation has a good vulcanization effect. The obtained rubber sealing ring has outstanding high and low temperature resistance, maintains good use flexibility within the temperature range of -70 to 260°C, and has the advantages of ozone resistance and weather aging resistance.

[0024] Furthermore, the accelerator is a mixture of 2-mercaptobenzothiazole, N-cyclohexyl-2-benzothiazole sulfenamide and tetramethylthiuram disulfide in a weight ratio of 1:2:1. By strictly controlling the type and weight ratio of the accelerator, the vulcanization time can be shortened, the amount of vulcanizing agent can be reduced, and the physical and mechanical properties of the rubber can be improved.

[0025] Furthermore, the coupling agent is made of phenyltriethoxysilane, which can greatly improve the physical and mechanical properties of the reinforced rubber.

[0026] A preparation process of a food-grade water-resistant rubber sealing ring comprises the following steps: Step 1: Add silicone rubber and fluororubber according to the weight of the constituent raw materials into an internal mixer and plasticize for 6-10 minutes at a temperature of 200-300°C; Step 2: Then add the reinforcing agent, anti-wear agent, anti-aging agent, accelerator and coupling agent according to the weight of the constituent raw materials into the internal mixer and mix for 40-50 minutes at a temperature of 105-125°C; Step 3: After mixing, the rubber material is pressed into shape, and the molded rubber material is added into a mold in a vulcanizing device, and a vulcanizing agent is added according to the weight of the raw materials for vulcanization treatment for 10-20 minutes at a temperature of 160-200°C, thereby obtaining a food-grade water-resistant rubber sealing ring.

[0027] It is worth noting that the main raw materials of the rubber sealing ring prepared in the present application, silicone rubber and fluororubber, are both food-grade rubbers. In addition, the main raw materials of the reinforcing agent, wear-resistant agent and antioxidant with a larger weight proportion in the additives are all food-grade, so that the prepared rubber sealing ring is food-grade, close to a non-toxic and odorless product, more environmentally friendly, and in compliance with relevant national safety standards.

Claims

1. A food-grade water-resistant rubber sealing ring, characterized in that: The rubber sealing rubber ring comprises the following raw materials in parts by weight: 50-80 parts of silicone rubber, 30-40 parts of fluororubber, 16-18 parts of reinforcing agent, 8-12 parts of anti-aging agent, 5-10 parts of antioxidant, 1-5 parts of vulcanizing agent, 1-3 parts of accelerator and 1-3 parts of coupling agent.

2. A food-grade water-resistant rubber sealing ring according to claim 1, characterized in that: The reinforcing agent is prepared by mixing plant carbon black powder and silica powder, and the weight ratio of the plant carbon black powder to the silica powder is 2:

1.

3. The food-grade water-resistant rubber sealing ring according to claim 1, characterized in that: The wear-resistant agent is prepared by mixing polyoxymethylene powder and silica powder, and the weight ratio of the polyoxymethylene powder to the silica powder is 1:

1.

4. A food-grade water-resistant rubber sealing ring according to claim 1, characterized in that: The antioxidant is made of butylated hydroxytoluene.

5. The food-grade water-resistant rubber sealing ring according to claim 1, characterized in that: The curing agent is a mixture of diisopropylbenzene peroxide, di-tert-butyl diisopropylbenzene peroxide and 2,4-dichlorobenzoyl peroxide in a weight ratio of 2:1:

1.

6. The food-grade water-resistant rubber sealing ring according to claim 1, characterized in that: The accelerator is a mixture of 2-mercaptobenzothiazole, N-cyclohexyl-2-benzothiazole sulfenamide and tetramethylthiuram disulfide in a weight ratio of 1:2:

1.

7. The food-grade water-resistant rubber sealing ring according to claim 1, characterized in that: The coupling agent is made of phenyltriethoxysilane.

8. A process for preparing a food-grade water-resistant rubber sealing ring according to any one of claims 1 to 7, characterized in that: The specific steps include: Step 1: Add silicone rubber and fluororubber according to the weight of the constituent raw materials into an internal mixer and plasticize for 6-10 minutes at a temperature of 200-300°C; Step 2: Then add the reinforcing agent, anti-wear agent, antioxidant, accelerator and coupling agent according to the weight of the constituent raw materials into the internal mixer and mix for 40-50 minutes at a temperature of 105-125°C; Step 3: After mixing, the rubber material is pressed into shape, and the molded rubber material is added into a mold in a vulcanizing device, and a vulcanizing agent is added according to the weight of the raw materials for vulcanization treatment for 10-20 minutes at a temperature of 160-200°C, thereby obtaining a food-grade water-resistant rubber sealing ring.