Environment-friendly self-lubricating flame-retardant rubber formula and preparation method thereof

Abstract

The invention relates to an environment-friendly self-lubricating flame-retardant rubber formula and a preparation method thereof. The rubber prepared by the rubber formula and the preparation method is environment-friendly and flame-retardant, and has better self-lubricating capability. All the raw materials are environment-friendly materials. Red phosphorus, decabromodiphenyl ethane and aluminum hydroxide are added, so that after the environment-friendly self-lubricating flame-retardant rubber is combusted, aluminum hydroxide is decomposed to release a large amount of crystal water, the combustion temperature is rapidly reduced, the red phosphorus can rapidly absorb surrounding heat in the combustion process, surrounding oxygen is combusted, and the red phosphorus and the aluminum hydroxide are combined to achieve a rapid cooling effect; and the reaction of decabromodiphenylethane can form a protective layer on the surface of the material, so that the end of heat and oxygen is further prevented, and the aim of flame retardance is comprehensively fulfilled. Oleamide and polyethylene wax are added, and the oleamide and the polyethylene wax are separated out to cover the surface within 24-48 hours after the environment-friendly self-lubricating flame-retardant rubber is prepared, so that the self-lubricating purpose is achieved.

Description

Technical Field

[0001] The invention relates to the field of oil seals, and in particular to an environmentally friendly self-lubricating flame-retardant rubber formula and a preparation method thereof. Background Art

[0002] The service life of industrial and mining machinery sealing products is short. The reasons are: industrial and mining machinery sealing products are in a state of friction for a long time during use, which causes large wear and tear on the rubber; the existing rubber used for industrial and mining machinery sealing products is often only considered for its flame retardant ability. Summary of the invention

[0003] The present invention proposes an environmentally friendly self-lubricating flame-retardant rubber formula and a preparation method thereof, aiming to solve the above problems.

[0004] The technical solution of the present invention: An environmentally friendly self-lubricating flame-retardant rubber formula, the formula comprising the following raw materials: 100 parts of nitrile rubber N41, 50 parts of environmentally friendly N550 carbon black, 30 parts of aluminum hydroxide, 10 parts of red phosphorus, 10 parts of decabromodiphenylethane, 10 parts of environmentally friendly plasticizer, 5 parts of zinc oxide, 2.5 parts of stearic acid, 5 parts of oleamide, 3.5 parts of polyethylene wax, 1.5 parts of sulfur, 3 parts of environmentally friendly accelerator; The above raw materials are all measured by weight.

[0005] A method for preparing an environmentally friendly self-lubricating flame-retardant rubber, wherein the raw materials are prepared according to the above formula, and the method comprises the following steps: 1) Add nitrile rubber N41 to the internal mixer and pressurize for 1 min; add zinc oxide, stearic acid, oleamide, polyethylene wax, aluminum hydroxide, red phosphorus, decabromodiphenylethane and 1 / 2N550 carbon black and pressurize for 1-2 min; add 1 / 2N550 carbon black and environmentally friendly plasticizer and pressurize for 1-2 min; mix to 100°C and then lift the plug to vent once; mix to 120°C and then lift the plug to vent once; mix to 135°C and then discharge rubber A; 2) Rubber A is put into the open mill and thinned twice, then the sheet is taken out and heat is dissipated to obtain a semi-finished product; 3) After the semi-finished product is parked for 12 hours, it is added to the internal mixer, sulfur and environmentally friendly accelerator are added, and the internal mixer is pressurized for 30 seconds twice, and then the rubber B is discharged; 4) Rubber B is put into the open mill and thinned twice, then the sheet is taken out and heat is dissipated to obtain the finished product; The finished product is an environmentally friendly self-lubricating flame-retardant rubber.

[0006] The invention has the advantages of reasonable design and ingenious conception, and the prepared rubber is environmentally friendly and flame retardant and has good self-lubricating ability.

[0007] All raw materials are environmentally friendly materials.

[0008] By adding red phosphorus, decabromodiphenylethane and aluminum hydroxide, the environmentally friendly self-lubricating flame-retardant rubber can be made. After burning, the aluminum hydroxide decomposes to release a large amount of crystalline water, which quickly reduces the combustion temperature. The combustion process of red phosphorus will also quickly absorb the surrounding heat and burn the surrounding oxygen. The combination of the two can achieve a rapid cooling effect. The reaction of decabromodiphenylethane will form a protective layer on the surface of the material, further preventing the end of heat and oxygen, and comprehensively achieving the purpose of flame retardancy.

[0009] After adding oleic acid amide and polyethylene wax, within 24-48 hours after the preparation of the environmentally friendly self-lubricating flame-retardant rubber, oleic acid amide and polyethylene wax will precipitate and cover the surface, achieving the purpose of self-lubrication. In the rubber industry, oleic acid amide is useful as a lubricant, but it is not long-lasting. Oleic acid amide is volatile, and polyethylene wax is generally used for brightening; oleic acid amide is easy to precipitate, and the precipitation speed is relatively fast, while polyethylene wax takes a long time to precipitate and the speed is slow. The two are mixed, based on the precipitation of low molecular weight substances, which can affect each other. The rapid precipitation of oleic acid amide can accelerate the precipitation speed of polyethylene wax. DETAILED DESCRIPTION

[0010] Ingredients: 30kg nitrile rubber N41, 15kg environmentally friendly N550 carbon black, 9kg aluminum hydroxide, 3kg red phosphorus, 3kg decabromodiphenylethane, 3kg environmentally friendly plasticizer, 1.5kg zinc oxide, 0.75kg stearic acid, 1.5kg oleic acid amide, 1.05kg polyethylene wax, 0.45kg sulfur, 0.9kg environmentally friendly accelerator.

[0011] X(S)N-75 internal mixer and XKJ-560 open mixer are used.

[0012] 1) Add nitrile rubber N41 to the internal mixer and pressurize for 1 min; add zinc oxide, stearic acid, oleamide, polyethylene wax, aluminum hydroxide, red phosphorus, decabromodiphenylethane and 1 / 2N550 carbon black and pressurize for 1-2 min; add 1 / 2N550 carbon black and environmentally friendly plasticizer and pressurize for 1-2 min; mix to 100°C and then lift the plug to vent once; mix to 120°C and then lift the plug to vent once; mix to 135°C and then discharge rubber A; 2) Rubber A is put into the open mill and thinned twice, then the sheet is taken out and heat is dissipated to obtain a semi-finished product; 3) After the semi-finished product is parked for 12 hours, it is added to the internal mixer, sulfur and environmentally friendly accelerator are added, and the internal mixer is pressurized for 30 seconds twice, and then the rubber B is discharged; 4) Rubber B is put into the open mill and thinned twice, then the sheet is taken out and heat is dissipated to obtain the finished product; When pressurizing in the above 1) and 3), the control pressure is 10Mpa; The finished product is environmentally friendly self-lubricating flame retardant rubber.

[0013] Compare the performance of environmentally friendly self-lubricating flame retardant rubber and ordinary flame retardant rubber:

[0014] Environmentally friendly self-lubricating flame retardant rubber can achieve the flame retardant properties of ordinary flame retardant rubber. Compared with ordinary flame retardant rubber, the mechanical properties are improved to a certain extent and it has self-lubricating ability.

[0015] Environmental testing items: 1. Does not contain banned substances such as polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE) in RoSH2.0.

[0016] 2. It does not contain banned substances such as decabromodiphenyl ether issued by TSCA of the United States.

[0017] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An environmentally friendly self-lubricating flame-retardant rubber formula, characterized in that: The formula includes the following raw materials: 100 parts of nitrile rubber N41, 50 parts of environmentally friendly N550 carbon black, 30 parts of aluminum hydroxide, 10 parts of red phosphorus, 10 parts of decabromodiphenylethane, 10 parts of environmentally friendly plasticizer, 5 parts of zinc oxide, 2.5 parts of stearic acid, 5 parts of oleamide, 3.5 parts of polyethylene wax, 1.5 parts of sulfur, 3 parts of environmentally friendly accelerator; The above raw materials are all measured by weight.

2. A method for preparing an environmentally friendly self-lubricating flame-retardant rubber, characterized in that: According to the formula of claim 1, each raw material is prepared, and the method comprises the following steps: 1) Add nitrile rubber N41 to the internal mixer and pressurize for 1 min; add zinc oxide, stearic acid, oleamide, polyethylene wax, aluminum hydroxide, red phosphorus, decabromodiphenylethane and 1 / 2N550 carbon black and pressurize for 1-2 min; add 1 / 2N550 carbon black and environmentally friendly plasticizer and pressurize for 1-2 min; mix to 100°C and then lift the plug to vent once; mix to 120°C and then lift the plug to vent once; mix to 135°C and then discharge rubber A; 2) Rubber A is put into the open mill and thinned twice, then the sheet is taken out and heat is dissipated to obtain a semi-finished product; 3) After the semi-finished product is parked for 12 hours, it is added to the internal mixer, sulfur and environmentally friendly accelerator are added, and the internal mixer is pressurized for 30 seconds twice, and then the rubber B is discharged; 4) Rubber B is put into the open mill and thinned twice, then the sheet is taken out and heat is dissipated to obtain the finished product; The finished product is environmentally friendly self-lubricating flame-retardant rubber.

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