Production method of rubber core product

Abstract

The invention discloses a production method of a rubber core product, which comprises the following steps: drying polyester polyol, quantitatively adding the dried polyester polyol into a reaction kettle A, dehydrating, cooling, introducing into a reaction kettle B, and quantitatively adding isocyanate into the reaction kettle B; a prepolymer material is obtained after reaction and dehydration, and the obtained prepolymer material is sealed and stored; the preparation method comprises the following steps: storing a pre-polymer material, drying the stored pre-polymer material at 45-55 DEG C, adding the dried pre-polymer material into a stirring container, adding a molten chain extender into the stirring container, fully stirring the two raw materials, pouring the mixed material into a mold cavity which is preheated in advance, and vulcanizing to obtain a molded rubber core product. According to the invention, the production is convenient to control, and the product is good in stability and has better wear resistance and tear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of seal production, and in particular to a production method of a rubber core product. Background Art

[0002] Polyester polyol is a polyester polyol obtained by polycondensation of dicarboxylic acid and diol. The rubber core is usually used for underbalanced seals in the process of oil drilling. The quality of the rubber core must be stable and reliable to ensure the prevention and control effect of blowout prevention.

[0003] At present, many rubber cores fail prematurely in experiments, and the performance of rubber cores produced by many manufacturers is unstable and the quality is unreliable. The Chinese invention patent application with publication number CN105218896A discloses an oil-resistant rubber produced by raw rubber according to a conventional vulcanized rubber production method, wherein the raw rubber is composed of the following components by weight: 85 parts of NBR40 nitrile rubber, 15 parts of MPOL200 cis-butadiene rubber, 8 parts of zinc oxide, 1.5 parts of stearic acid, 0.5 parts of sulfur, 2.0 parts of CZ accelerator, 1.0 parts of TMTD accelerator, 50 parts of channel black, 5 parts of DBT dibutyl phthalate, and 15 parts of vinyl chloride and vinyl acetate copolymer resin. The existing ingredients are complex, the process flow is difficult to control, and the product reliability, service life, wear resistance and tear resistance still need to be improved. Summary of the invention

[0004] The present invention provides a production method of a rubber core product, one of the technical problems to be solved is: improving the quality of the rubber core product and extending its service life.

[0005] In view of the above problems in the prior art, according to one aspect disclosed in the present invention, the present invention adopts the following technical solution:

[0006] A method for producing a rubber core product, comprising:

[0007] Step 1: Synthesis of prepolymer materials

[0008] The polyester polyol is baked, and then the baked polyester polyol is quantitatively added into the A reactor, and the A reactor is heated to 125-135° C. At this temperature, the polyester polyol is dehydrated for 1.5-2.5 hours;

[0009] The temperature of the reactor A is then lowered to 35-45° C., and the polyester polyol is then introduced into the reactor B;

[0010] After the temperature of the polyester polyol in the B reactor drops to 18-22° C., isocyanate is quantitatively added to the B reactor;

[0011] Then the temperature of the liquid in the B reaction kettle is raised to 45-55° C., and the timing is started when the temperature reaches the set temperature. Dehydration is started after 1 hour and 30 minutes to 1 hour and 50 minutes, and the dehydration time is 1 hour and 10 minutes to 1 hour and 30 minutes. After the dehydration is completed, a prepolymer material is obtained, and the obtained prepolymer material is sealed and stored;

[0012] Step 2: Production of plastic core products

[0013] The prepolymer material stored in step 1 is baked at a temperature of 45-55°C, and the baked prepolymer material is added to a stirring container, and then the melted chain extender is added to the stirring container, and the two raw materials are fully stirred, and the temperature of the mixed material is maintained between 90-115°C; the mixed material is poured into the preheated mold cavity, and the mixed material is allowed to fully fill the cavity. After the rubber material on the upper layer of the mold cavity is solidified, the upper mold of the mold is closed, and the mold is sent to a vulcanizer to be pressurized to 1.8-2.2Mpa, and the molding and vulcanization are performed for 230-250 minutes; after the vulcanization is completed, the mold is removed and the rubber core product is taken out, and after the product is basically trimmed, it is placed in a 120-140°C oven for two-stage vulcanization for 21-25 hours to obtain a molded rubber core product.

[0014] In order to better realize the present invention, a further technical solution is:

[0015] Furthermore, in the step 1, the reaction kettle A is heated to 130° C., at which temperature, the polyester polyol is dehydrated for 2 hours.

[0016] Furthermore, in the step 1, the temperature of the reactor A is further reduced to 40° C., and then the polyester polyol is introduced into the reactor B.

[0017] Furthermore, in the step 1, after the temperature of the polyester polyol in the B reactor drops to 20° C., material T is then quantitatively added to the B reactor.

[0018] Furthermore, in the step 1, the temperature of the liquid in the B reactor is raised to 50° C., and the timing is started when the temperature reaches the set temperature. Dehydration is started after 1 hour and 40 minutes, and the dehydration time is 1 hour and 20 minutes.

[0019] Furthermore, in the step 2, the prepolymer material stored in the step 1 is baked at a temperature of 50° C., and the baked prepolymer material is added to the stirring container.

[0020] Furthermore, in step 2, the upper mold of the mold is closed, and the mold is put into a vulcanizer and pressurized to 2Mpa, and the molding and vulcanization are performed for 240 minutes.

[0021] Furthermore, in step 2, after the vulcanization is completed, the mold is removed and the rubber core product is taken out. After the product is basically trimmed, it is placed in a 130° C. oven for second-stage vulcanization for 24 hours to obtain a molded rubber core product.

[0022] Furthermore, in step 2, the weight ratio of the prepolymer material to the chain extender is 19-21:1.

[0023] Furthermore, in step 2, the chain extender is MOCA.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The invention discloses a production method of a rubber core product, which comprises synthesizing a prepolymer material first and then preparing the rubber core product. The production process is simple and convenient, and the process control is convenient. The product is used as a rubber core of a rotary blowout preventer, and can greatly improve the wear resistance and tear resistance of the rubber core of the rotary blowout preventer. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0027] Embodiment 1: A method for producing a rubber core product, comprising:

[0028] Step 1: Synthesis of prepolymer materials

[0029] The polyester polyol is baked, and then quantitatively added into the A reactor, and the A reactor is heated to 125° C. At this temperature, the polyester polyol is dehydrated for 1.5 hours.

[0030] The temperature of the reactor A was then lowered to 35° C., and then the polyester polyol was introduced into the reactor B.

[0031] After the temperature of the polyester polyol in the B reactor drops to 18° C., isocyanate is quantitatively added to the B reactor; after the isocyanate reacts with the polyester polyol, urethane (polyurethane) is generated. The amount of isocyanate added is generally about 40%. Isocyanate is mainly used for the molding of the rotary blowout preventer rubber core, which can greatly improve the wear resistance and tear resistance of the rotary blowout preventer rubber core.

[0032] The temperature of the liquid in the B reactor was then raised to 45°C, and timing was started when the set temperature was reached. Dehydration was started after 1 hour and 30 minutes, and the dehydration time was 1 hour and 10 minutes. After the dehydration was completed, a prepolymer material was obtained, and the obtained prepolymer material was sealed and stored.

[0033] Step 2: Production of plastic core products

[0034] The prepolymer material stored in step 1 is baked at a temperature of 45°C, and the baked prepolymer material is added to a stirring container. Then, a melted chain extender is added to the stirring container. The chain extender can be MOCA. The prepolymer material and the chain extender can be added at a weight ratio of 19 to 1, and the two raw materials are fully stirred, and the temperature of the mixed material is maintained between 90°C; the mixed material is poured into the preheated mold cavity, and the mixed material is allowed to fully fill the cavity. After the rubber material on the upper layer of the mold cavity is solidified, the upper mold of the mold is closed, and the mold is sent to a vulcanizer to be pressurized to 1.8Mpa, and the molding is vulcanized for 230 minutes; after the vulcanization is completed, the mold is removed and the rubber core product is taken out. After the product is basically trimmed, it is placed in a 120°C oven for two-stage vulcanization for 21 hours to obtain a molded rubber core product.

[0035] Embodiment 2: A method for producing a rubber core product, comprising:

[0036] Step 1: Synthesis of prepolymer materials

[0037] The polyester polyol is baked, and then quantitatively added into the A reactor, and the A reactor is heated to 128° C. At this temperature, the polyester polyol is dehydrated for 1.8 hours.

[0038] The temperature of the reactor A was then lowered to 28° C., and then the polyester polyol was introduced into the reactor B.

[0039] After the temperature of the polyester polyol in the B reactor drops to 19° C., material T is then quantitatively added to the B reactor.

[0040] The temperature of the liquid in the B reactor was then raised to 49° C. The timing was started when the set temperature was reached. Dehydration was started after 1 hour and 35 minutes, and the dehydration time was 1 hour and 17 minutes. After the dehydration was completed, a prepolymer material was obtained, and the obtained prepolymer material was sealed and stored.

[0041] Step 2: Production of plastic core products

[0042] The prepolymer material stored in step 1 is baked at a temperature of 48°C, and the baked prepolymer material is added to a stirring container, and then the melted chain extender is added to the stirring container. The prepolymer material and the chain extender can be added at a weight ratio of 20 to 1, and the two raw materials are fully stirred, and the temperature of the mixed material is maintained between 95°C; the mixed material is poured into the preheated mold cavity, and the mixed material is allowed to fully fill the cavity. After the rubber material on the upper layer of the mold cavity is solidified, the upper mold of the mold is closed, and the mold is sent to a vulcanizer to be pressurized to 1.9Mpa, and the molding is vulcanized for 235 minutes; after the vulcanization is completed, the mold is removed and the rubber core product is taken out. After the product is basically trimmed, it is placed in a 125°C oven for two-stage vulcanization for 22 hours to obtain a molded rubber core product.

[0043] Embodiment 3: A method for producing a rubber core product, comprising two steps of synthesizing a prepolymer material and producing the rubber core product.

[0044] Step 1: Prepolymer material synthesis

[0045] Put polyester polyol (PTMG) into an oil drum oven and bake at 65℃, add polyester polyol quantitatively into kettle A, and heat kettle A to about 80℃. When the temperature of polyester polyol reaches 130℃, start dehydration, and dehydration ends after 2h. Cool kettle A to 40℃, introduce polyester polyol into kettle B, and add T material (T-80+T-100) quantitatively after the stock solution temperature drops to 20℃. When the temperature of B stock solution rises to 50℃, start dehydration after 1 hour and 40 minutes, and the dehydration time is 1 hour and 20 minutes. After dehydration, seal the obtained raw materials and store them for later use.

[0046] Step 2: Plastic core product molding production process

[0047] The prepared prepolymer material is baked at a temperature of 50°C, and then 20 kg of the prepolymer material is added to the mixing barrel, and 1000 g of the melted chain extender (MOCA) is added; the two raw materials are fully stirred, and the temperature of the mixed material is maintained between 90-115°C. The mixed material is poured into the mold cavity that has been preheated (100°C) in advance, and the mixed material is allowed to fully fill the cavity. After the rubber material on the upper layer of the mold cavity is solidified, the upper mold of the mold is closed, and the mold is sent to the vulcanizer to be pressurized at 2MPa for molding and vulcanization for 240 minutes; after the vulcanization is completed, the mold is removed and the rubber core product is taken out. After the product is basically trimmed, it is placed in a 130°C oven for two-stage vulcanization for 24 hours to obtain a molded rubber core product.

[0048] Embodiment 4: A method for producing a rubber core product, comprising:

[0049] Step 1: Synthesis of prepolymer materials

[0050] The polyester polyol is baked, and then quantitatively added into the A reactor, and the A reactor is heated to 125-135° C. At this temperature, the polyester polyol is dehydrated for 1.5-2.5 hours.

[0051] The temperature of the A reactor is then lowered to 35-45° C., and then the polyester polyol is introduced into the B reactor.

[0052] After the temperature of the polyester polyol in the B reactor drops to 18-22° C., the T material is quantitatively added to the B reactor.

[0053] Then the temperature of the liquid in the B reaction kettle is raised to 45-55° C., and the timing is started when the temperature reaches the set temperature. Dehydration is started after 1 hour and 30 minutes to 1 hour and 50 minutes, and the dehydration time is 1 hour and 10 minutes to 1 hour and 30 minutes. After the dehydration is completed, a prepolymer material is obtained, and the obtained prepolymer material is sealed and stored;

[0054] Step 2: Production of plastic core products

[0055] The prepolymer material stored in step 1 is baked at a temperature of 45-55°C, and the baked prepolymer material is added to a stirring container, and then the melted chain extender is added to the stirring container, and the two raw materials are fully stirred, and the temperature of the mixed material is maintained between 90-115°C; the mixed material is poured into the preheated mold cavity, and the mixed material is allowed to fully fill the cavity. After the rubber material on the upper layer of the mold cavity is solidified, the upper mold of the mold is closed, and the mold is sent to a vulcanizer to be pressurized to 1.8-2.2Mpa, and the molding and vulcanization are performed for 230-250 minutes; after the vulcanization is completed, the mold is removed and the rubber core product is taken out, and after the product is basically trimmed, it is placed in a 120-140°C oven for two-stage vulcanization for 21-25 hours to obtain a molded rubber core product.

[0056] Embodiment 5: A method for producing a rubber core product, comprising:

[0057] Step 1: Synthesis of prepolymer materials

[0058] The polyester polyol is baked, and then the baked polyester polyol is quantitatively added into the A reactor, and the A reactor is heated to 132° C. At this temperature, the polyester polyol is dehydrated for 2.2 hours;

[0059] The temperature of the A reactor was then lowered to 33° C., and then the polyester polyol was introduced into the B reactor.

[0060] After the temperature of the polyester polyol in the B reactor drops to 21° C., material T is then quantitatively added to the B reactor.

[0061] The temperature of the liquid in the B reactor was then raised to 52° C. The timing was started when the set temperature was reached. Dehydration was started after 1 hour and 35 minutes, and the dehydration time was 1 hour and 25 minutes. After the dehydration was completed, a prepolymer material was obtained, and the obtained prepolymer material was sealed and stored.

[0062] Step 2: Production of plastic core products

[0063] The prepolymer material stored in step 1 is baked at a temperature of 52°C, and the baked prepolymer material is added to a stirring container, and then the melted chain extender is added to the stirring container, and the two raw materials are fully stirred, and the temperature of the mixed material is maintained between 110°C; the mixed material is poured into the preheated mold cavity, and the mixed material is allowed to fully fill the cavity. After the rubber material on the upper layer of the mold cavity is solidified, the upper mold of the mold is closed, and the mold is sent to a vulcanizer to be pressurized to 2.1Mpa, and the molding is vulcanized for 245 minutes; after the vulcanization is completed, the mold is removed and the rubber core product is taken out, and after the product is basically trimmed, it is placed in a 135°C oven for two-stage vulcanization for 23 hours to obtain a molded rubber core product.

[0064] Embodiment 6: A method for producing a rubber core product, comprising:

[0065] Step 1: Synthesis of prepolymer materials

[0066] The polyester polyol is baked, and then the baked polyester polyol is quantitatively added into the A reactor, and the A reactor is heated to 135° C. At this temperature, the polyester polyol is dehydrated for 2.5 hours;

[0067] The temperature of the reactor A is then lowered to 45° C., and then the polyester polyol is introduced into the reactor B.

[0068] After the temperature of the polyester polyol in the B reactor drops to 22° C., material T is then quantitatively added to the B reactor.

[0069] The temperature of the liquid in the B reactor was then raised to 55° C. The timing was started when the set temperature was reached. Dehydration was started after 1 hour and 50 minutes, and the dehydration time was 1 hour and 30 minutes. After the dehydration was completed, a prepolymer material was obtained, and the obtained prepolymer material was sealed and stored.

[0070] Step 2: Production of plastic core products

[0071] The prepolymer material stored in step 1 is baked at a temperature of 55°C, and the baked prepolymer material is added to a stirring container, and then the melted chain extender is added to the stirring container, and the two raw materials are fully stirred, and the temperature of the mixed material is maintained between 115°C; the mixed material is poured into the preheated mold cavity, and the mixed material is allowed to fully fill the cavity. After the rubber material on the upper layer of the mold cavity is solidified, the upper mold of the mold is closed, and the mold is sent to a vulcanizer to be pressurized to 2.2Mpa, and the molding is vulcanized for 250 minutes; after the vulcanization is completed, the mold is removed and the rubber core product is taken out, and after the product is basically trimmed, it is placed in a 140°C oven for two-stage vulcanization for 25 hours to obtain a molded rubber core product.

[0072] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0073] References to "one embodiment", "another embodiment", "embodiment", etc. in this specification refer to specific features, structures or characteristics described in conjunction with the embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0074] Although the present invention is described herein with reference to a plurality of illustrative embodiments of the present invention, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure and claims, a variety of variations and improvements may be made to the components and / or layout of the subject combination layout. In addition to variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A method for producing a rubber core product, characterized in that include: Step 1: Synthesis of prepolymer materials The polyester polyol is baked, and then the baked polyester polyol is quantitatively added into the A reactor, and the A reactor is heated to 125-135° C. At this temperature, the polyester polyol is dehydrated for 1.5-2.5 hours; The temperature of the reactor A is then lowered to 35-45° C., and the polyester polyol is then introduced into the reactor B; After the temperature of the polyester polyol in the B reactor drops to 18-22° C., isocyanate is quantitatively added to the B reactor; Then the temperature of the liquid in the B reaction kettle is raised to 45-55° C., and the timing is started when the temperature reaches the set temperature. Dehydration is started after 1 hour and 30 minutes to 1 hour and 50 minutes, and the dehydration time is 1 hour and 10 minutes to 1 hour and 30 minutes. After the dehydration is completed, a prepolymer material is obtained, and the obtained prepolymer material is sealed and stored; Step 2: Production of plastic core products The prepolymer material stored in step 1 is baked at a temperature of 45-55°C, and the baked prepolymer material is added to a stirring container, and then the melted chain extender is added to the stirring container, and the two raw materials are fully stirred, and the temperature of the mixed material is maintained between 90-115°C; the mixed material is poured into the preheated mold cavity, and the mixed material is allowed to fully fill the cavity. After the rubber material on the upper layer of the mold cavity is solidified, the upper mold of the mold is closed, and the mold is sent to a vulcanizer to be pressurized to 1.8-2.2Mpa, and the molding and vulcanization are performed for 230-250 minutes; after the vulcanization is completed, the mold is removed and the rubber core product is taken out, and after the product is basically trimmed, it is placed in a 120-140°C oven for two-stage vulcanization for 21-25 hours to obtain a molded rubber core product.

2. The method for producing a rubber core product according to claim 1, characterized in that In the step 1, the reactor A is heated to 130° C., at which temperature, the polyester polyol is dehydrated for 2 hours.

3. The method for producing a rubber core product according to claim 1, characterized in that In the step 1, the temperature of the reactor A is further reduced to 40° C., and then the polyester polyol is introduced into the reactor B.

4. The method for producing a rubber core product according to claim 1, characterized in that In the step 1, after the temperature of the polyester polyol in the B reactor drops to 20° C., material T is then quantitatively added to the B reactor.

5. The method for producing a rubber core product according to claim 1, characterized in that In the step 1, the temperature of the liquid in the B reactor is raised to 50° C., and the timing is started when the temperature reaches the set temperature. Dehydration is started after 1 hour and 40 minutes, and the dehydration time is 1 hour and 20 minutes.

6. The method for producing a rubber core product according to claim 1, characterized in that In the step 2, the prepolymer material stored in the step 1 is baked at a temperature of 50° C., and the baked prepolymer material is added into the stirring container.

7. The method for producing a rubber core product according to claim 1, characterized in that In the step 2, the upper mold of the mold is closed, and the mold is put into a vulcanizer and pressurized to 2Mpa, and the molding and vulcanization are performed for 240 minutes.

8. The method for producing a rubber core product according to claim 1, characterized in that In the step 2, after the vulcanization is completed, the mold is removed to take out the rubber core product, and after the product is basically trimmed, it is placed in a 130° C. oven for second-stage vulcanization for 24 hours to obtain a molded rubber core product.

9. The method for producing a rubber core product according to claim 1, characterized in that In the step 2, the weight ratio of the prepolymer material to the chain extender is 19-21 to 1.

10. The method for producing a rubber core product according to claim 1, characterized in that In the step 2, the chain extender is MOCA.