CN111171394A - Rubber diaphragm sizing material composition for automobile brake chamber and preparation method thereof - Google Patents
Rubber diaphragm sizing material composition for automobile brake chamber and preparation method thereof Download PDFInfo
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Abstract
The invention provides a rubber diaphragm sizing material composition for an automobile brake chamber, which is mainly prepared by taking natural rubber, butadiene rubber, styrene-butadiene rubber and synthetic eucommia rubber as main materials and adding auxiliary agents of nano zinc oxide, stearic acid, a chemical anti-aging agent, a reinforcing agent, a plasticizer, a vulcanizing agent, an adhesive, an accelerant, a dispersing agent, coumarone resin, microcrystalline wax and white carbon black, and has more excellent fatigue resistance, aging resistance and the like, the fatigue life of the rubber diaphragm for the brake chamber is prolonged, the rubber diaphragm adapts to the current automobile use conditions, and the safety of the automobile in the driving process is further ensured; the invention also provides a preparation method of the rubber diaphragm sizing material composition for the automobile brake chamber, which is characterized in that the raw materials are mixed according to the proportion and the steps, wherein the main process is completed in an internal mixer, so that the preparation steps of the rubber diaphragm sizing material composition are simplified, the number and the types of equipment are reduced, the preparation cost is reduced, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of preparation of diaphragm materials, and particularly relates to a rubber diaphragm rubber material composition for an automobile brake chamber and a preparation method thereof.
Background
The rubber diaphragm of the automobile brake chamber is a rubber-sandwiched fabric diaphragm which is used in the automobile brake chamber and plays a role in transferring pressure, and the rubber diaphragm has the main function of converting the pressure of compressed air into mechanical thrust, so that the automobile brake chamber plays a role in braking the automobile. The brake air chamber is a core component of the brake air chamber and also an important security component on an automobile, and the service life of the brake air chamber is directly influenced by the performance of the brake air chamber.
Along with the improvement of domestic and foreign integral infrastructures, the improvement of the working and living efficiency of people and the high-speed development of the automobile industry, the automobile driving road conditions are more and more diversified, the braking frequency of the automobile is more and more high, the higher and more requirements are provided for a braking system, and the higher requirements are provided for the fatigue resistance and the bending deflection resistance of the rubber diaphragm of the automobile braking air chamber.
In order to meet the market demand, the applicant continuously focuses on the research of a rubber diaphragm sizing material formula and a preparation method of a rubber diaphragm of an automobile brake chamber, wherein the automobile brake chamber rubber diaphragm sizing material formula with high fatigue resistance is named in patent number 200810302714.2, and discloses a rubber diaphragm sizing material formula of the automobile brake chamber with high fatigue resistance, which is mainly prepared from raw materials such as natural rubber, styrene butadiene rubber, polybutylene terephthalate and the like, and has the performances of high stress at definite elongation, high tensile strength, compression fatigue resistance, high dynamic deflection deformation resistance, high abrasion resistance and the like. In order to further improve the performance parameters of the existing products and simplify the production and manufacturing processes of the products, the applicant makes full research on the raw materials and the preparation method of the rubber diaphragm rubber material.
Disclosure of Invention
One of the objects of the present invention is: the rubber diaphragm rubber material composition for the automobile brake chamber is prepared from natural rubber, butadiene rubber, styrene butadiene rubber and synthetic eucommia rubber, and has superior fatigue resistance, aging resistance and the like due to the addition of the synthetic eucommia rubber, so that the fatigue life of the rubber diaphragm for the brake chamber is prolonged, the rubber diaphragm composition is suitable for current automobile use conditions, and the safety of the automobile in the driving process is further guaranteed.
The second purpose of the invention is: the preparation method comprises the following steps of mixing the raw materials according to a certain proportion, wherein most of the working procedures are finished in an internal mixer, so that the preparation steps of the rubber diaphragm sizing material composition are reduced, the number and the types of equipment are reduced, the preparation cost of the rubber diaphragm sizing material composition is reduced, and the production efficiency is improved.
In order to realize the first purpose of the invention, the invention adopts the following technical scheme:
the invention provides a rubber material composition of a rubber diaphragm of an automobile brake chamber, which mainly comprises the following raw materials in parts by weight:
30-70 parts of natural rubber, 10-35 parts of butadiene rubber, 10-35 parts of styrene butadiene rubber, 5-20 parts of synthetic eucommia rubber, 3-10 parts of nano zinc oxide, 0.5-2 parts of stearic acid, 2-8 parts of chemical anti-aging agent, 30-90 parts of reinforcing agent, 1-10 parts of plasticizer, 1-2 parts of vulcanizing agent, 3-10 parts of adhesive, 1-3 parts of accelerator, 1-6 parts of dispersing agent, 1-5 parts of coumarone resin, 1-3 parts of microcrystalline wax and 6-15 parts of white carbon black.
The rubber diaphragm sizing material composition for the automobile brake chamber adopts a blending system which takes natural rubber, butadiene rubber, styrene-butadiene rubber and synthetic eucommia rubber (trans-polyisoprene rubber) as main raw materials, wherein the eucommia rubber is a novel rubber species unique to China and is in a crystalline state at normal temperature, and can be converted into an elastomer after processes such as crosslinking, chlorination, epoxidation, hydrogenation and the like.
The typical but non-limiting parts by weight of the natural rubber in the invention are 30 parts, 40 parts, 50 parts, 60 parts and 70 parts, the typical but non-limiting parts by weight of the butadiene rubber are 10 parts, 15 parts, 20 parts, 25 parts and 35 parts, the typical but non-limiting parts by weight of the styrene butadiene rubber are 10 parts, 15 parts, 20 parts, 25 parts and 35 parts, and the typical but non-limiting parts by weight of the eucommia ulmoides rubber are 5 parts, 8 parts, 10 parts, 15 parts and 20 parts.
The nano zinc oxide is an inorganic active agent, can accelerate the vulcanization speed when being added into a rubber material, and can also improve the crosslinking degree, so that the rubber has good wear resistance, tearing resistance and elasticity; the nano zinc oxide in the invention is typically, but not limited to, 3 parts, 4 parts, 5 parts, 8 parts and 10 parts by weight.
Stearic acid reacts with nano zinc oxide to generate zinc stearate which plays the role of an activator in the synthesis and processing processes of rubber; meanwhile, the rubber can also play a role of a softener, so that the toughness of the rubber is stronger; the natural rubber can be prevented from being stuck on a roller and scorched, and the processing performance is improved; typical but non-limiting parts by weight of stearic acid in the present invention are 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 2 parts.
When an automobile is braked, the brake air chamber can generate high temperature of 50-80 ℃ to accelerate the aging of the rubber diaphragm, and the aging of the rubber diaphragm can be delayed by adding the chemical anti-aging agent; typical but non-limiting parts by weight of the antioxidant in the present invention are 2 parts, 3 parts, 5.5 parts, 6 parts, 8 parts.
The carbon black is used as a reinforcing agent and mainly has the function of improving the physical properties of rubber diaphragm rubber stock, such as hardness, breaking strength, tearing strength and the like; typical but non-limiting parts by weight of the reinforcing agent in the present invention are 30 parts, 45 parts, 65 parts, 80 parts, 90 parts.
The plasticizer is added in the rubber processing, so that the acting force among rubber molecules can be reduced, the glass transition temperature of the rubber is reduced, the rubber can be made to be plastic and fluid, the molding operations such as calendering and extrusion are facilitated, the hardness and the stretching stress of vulcanized rubber can be improved, higher elasticity and lower heat generation are endowed, the cold resistance is improved, and the like; typical but non-limiting parts by weight of the plasticizer in the present invention are 1 part, 3 parts, 6 parts, 8 parts, 10 parts.
The vulcanizing agent can accelerate the vulcanization of the rubber, improve the hardness, strength, aging resistance and heat resistance of the rubber and reduce the combustibility of the rubber; typical but non-limiting parts by weight of the vulcanizing agent in the present invention are 1 part, 1.2 parts, 1.6 parts, 1.8 parts, 2 parts.
The adhesive can increase the elasticity and viscosity of rubber, and increase the bonding fastening and fastness between the rubber material and the fabric, so that the relative deformation and displacement between the rubber material and the fabric are smaller in the use process of the rubber diaphragm, and the service life of the rubber diaphragm is prolonged; typical but non-limiting parts by weight of the binder in the present invention are 3 parts, 4 parts, 6 parts, 8 parts, 10 parts.
Further, the rubber material composition for the rubber diaphragm of the automobile brake chamber comprises the following raw materials in parts by weight:
40-60 parts of natural rubber, 15-25 parts of butadiene rubber, 15-25 parts of styrene butadiene rubber, 8-15 parts of synthetic eucommia rubber, 4-8 parts of nano zinc oxide, 0.8-1.5 parts of stearic acid, 3-6 parts of chemical anti-aging agent, 45-80 parts of reinforcing agent, 3-8 parts of plasticizer, 1.2-1.8 parts of vulcanizing agent, 4-8 parts of adhesive, 1-2 parts of accelerator, 2-5 parts of dispersing agent, 1.5-3 parts of coumarone resin, 1.5-2.5 parts of microcrystalline wax and 8-12 parts of white carbon black.
Preferably, the rubber diaphragm sizing material composition for the automobile brake chamber is prepared from the following raw materials in parts by weight:
50 parts of natural rubber, 20 parts of butadiene rubber, 20 parts of styrene-butadiene rubber, 10 parts of synthetic eucommia rubber, 5 parts of nano-zinc oxide, 1 part of stearic acid, 5.5 parts of chemical anti-aging agent, 65 parts of reinforcing agent, 6 parts of plasticizer, 1.6 parts of vulcanizing agent, 6 parts of adhesive, 1.7 parts of accelerator, 3 parts of dispersant, 2 parts of coumarone resin, 2 parts of microcrystalline wax and 10 parts of white carbon black.
When the raw materials used in the rubber diaphragm sizing material composition for the automobile brake chamber are used in the following proportions, the obtained rubber diaphragm has better performance: the chemical anti-aging agent consists of 1 part of anti-aging agent 4010NA, 1.5 parts of anti-aging agent RD, 1 part of anti-aging agent BLE-W and 2 parts of anti-fatigue agent PL-6002.
The reinforcing agent in the rubber diaphragm sizing material composition for the automobile brake chamber consists of N33045 parts of high-wear-resistance carbon black and N55020 parts of fast extrusion carbon black.
The accelerator in the rubber diaphragm sizing material composition for the automobile brake chamber consists of 1 part of accelerator CZ, 0.5 part of accelerator DTDM and 0.2 part of accelerator TMTD.
The vulcanizing agent in the rubber diaphragm sizing material composition for the automobile brake chamber is insoluble sulfur.
The plasticizer in the rubber diaphragm sizing material composition for the automobile brake chamber is paraffin oil.
The adhesive in the rubber diaphragm sizing material composition for the automobile brake chamber is an adhesive RC.
The dispersant in the rubber diaphragm sizing material composition for the automobile brake chamber is dispersant RPD-100.
The microcrystalline wax in the rubber diaphragm sizing material composition for the automobile brake chamber is 9332F.
In order to achieve the second purpose of the invention, the invention adopts the following technical scheme:
the preparation method of the rubber material composition for the rubber diaphragm of the automobile brake chamber according to the formula is characterized by comprising the following steps of: the method comprises the following steps:
1) putting natural rubber, butadiene rubber, styrene-butadiene rubber, synthetic eucommia rubber, a dispersing agent, nano-zinc oxide, stearic acid, microcrystalline wax, coumarone resin and a chemical anti-aging agent into an internal mixer at one time according to the formula amount, and plastifying for 45-65 seconds in an internal mixing chamber;
2) adding a reinforcing agent into the internal mixer in the step 1), mixing according to the process, wherein the mixing time is as follows: 280 +/-30-350 +/-30 seconds;
3) when the temperature of the rubber material in the mixing chamber reaches 80-95 ℃, adding a plasticizer into the mixing chamber in the step 2), continuously mixing until the rubber is discharged at 120-140 ℃, and cooling the rubber material to room temperature;
4) putting the rubber sheet cooled to room temperature into an internal mixer, adding a vulcanizing agent, an adhesive, an accelerant and white carbon black into an internal mixing chamber when the temperature of the rubber material rises to 65-85 ℃, mixing for 220 +/-30-260 +/-30 seconds, pressing a bolt for 25-35 seconds, lifting the bolt, cleaning the vulcanizing agent accumulated on the bolt, continuously mixing the rubber material after cleaning is finished, and discharging the rubber when the temperature of the rubber material in the internal mixing chamber reaches 95-115 ℃;
5) and (3) dropping the rubber material on an open mill, tabletting, cooling and loading into a storage device to obtain the rubber material.
As an improvement, the plastication time in the step 1) is 50-60 seconds.
As a modification, the mixing time in step 2) is 300. + -. 30 seconds.
As an improvement, the temperature of the plasticizer in the step 3) is 88-92 ℃, and the degumming temperature is 130 ℃.
As an improvement, in the step 4), when the temperature of the rubber material rises to 75 ℃, adding a vulcanizing agent, an adhesive, an accelerant and white carbon black into an internal mixing chamber, mixing for 240 +/-30 seconds, pressing for 30 seconds, lifting a top plug, cleaning the vulcanizing agent accumulated on the top plug, after cleaning is finished, continuously mixing the rubber material, and when the temperature of the rubber material in the internal mixing chamber reaches 100 ℃, discharging the rubber.
Compared with the prior art, the invention has the following beneficial effects:
1. the eucommia rubber is a special novel rubber seed in China, is in a crystalline state at normal temperature, can be converted into an elastomer after being subjected to processes such as crosslinking, chlorination, epoxidation, hydrogenation and the like, is a material between plastic and rubber, has the characteristics of low heat generation, no damping, high resilience in bending, excellent bending fatigue property and the like, simultaneously shows the characteristics of resin, is small in extrusion shrinkage, smooth in surface and beneficial to design and control of the size of a semi-finished product.
The rubber diaphragm sizing material composition for the automobile brake chamber is prepared by taking natural rubber, butadiene rubber, styrene butadiene rubber and synthetic eucommia rubber (trans-polyisoprene rubber) as main raw materials, has excellent performances of more excellent fatigue resistance, oxidation resistance, bending resistance and the like, improves the fatigue life of the rubber diaphragm for the brake chamber, adapts to the current automobile use conditions, ensures the safety of the automobile in the driving process, and has the service life of 250 ten thousand times which exceeds 100 ten thousand times specified by national standards and 200 ten thousand times of American standards according to actual tests.
2. The invention provides a preparation method of a rubber diaphragm sizing material composition of an automobile brake chamber, which is characterized in that plastication and mixing are carried out on all raw materials according to a certain proportion and steps, wherein most of procedures are finished in an internal mixer, so that the manufacturing steps of a rubber diaphragm are reduced, the types and the number of production equipment are reduced, the production and manufacturing cost is reduced, and the production efficiency is improved.
3. The invention relates to selection collocation of four main raw materials and various auxiliary agents, and determination of parts of vulcanizing agents: after a plurality of tests are carried out, the formula of the rubber compound composition of the automobile brake chamber rubber diaphragm determined after optimization is shown in the following table 1:
table 1: rubber diaphragm sizing material composition formula
The performance parameters of the rubber diaphragm sizing composition of the automobile brake chamber are as follows 2:
table 2: performance detection table of rubber diaphragm sizing material composition
Note: the properties described in this table are properties of the composition formulations described in table 1 above, and were tested using the national standard method.
Compared with the prior art, the rubber material for the rubber diaphragm of the automobile brake chamber is prepared by taking natural rubber, butadiene rubber, styrene butadiene rubber and synthetic eucommia rubber (trans-polyisoprene rubber) as main raw materials according to the formula, has excellent performances of more excellent fatigue resistance, oxidation resistance, flex resistance and the like, improves the fatigue life of the rubber diaphragm of the brake chamber, adapts to the current automobile use conditions, ensures the safety of the automobile in the driving process, and has the service life of 250 ten thousand times which exceeds 100 ten thousand times specified by the national standard and 200 ten thousand times of the American standard according to actual tests.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to 5 specific embodiments.
Example 1:
the raw materials are weighed according to the following formula, 30 parts of natural rubber, 10 parts of butadiene rubber, 10 parts of styrene butadiene rubber, 5 parts of synthetic eucommia rubber, 3 parts of nano zinc oxide, 0.5 part of stearic acid, 2 parts of chemical anti-aging agent, 30 parts of reinforcing agent, 1 part of plasticizer, 1 part of vulcanizing agent, 3 parts of adhesive, 1.7 parts of accelerator, 1 part of dispersing agent, 1 part of coumarone resin, 1 part of microcrystalline wax and 6 parts of white carbon black.
1) Putting natural rubber, butadiene rubber, styrene-butadiene rubber, synthetic eucommia rubber, a dispersing agent, nano zinc oxide, stearic acid, microcrystalline wax, coumarone resin and a chemical anti-aging agent into an internal mixer at one time according to the formula amount, and plastifying in an internal mixing chamber for 50-60 seconds;
2) adding a reinforcing agent into the internal mixer in the step 1), mixing according to the process, wherein the mixing time is as follows: 300 +/-30 seconds;
3) when the temperature of the rubber material in the mixing chamber reaches 88-92 ℃, adding a plasticizer into the mixing chamber in the step 2), continuously mixing until the temperature reaches 130 ℃ to discharge rubber, and cooling the rubber material to room temperature;
4) putting the rubber sheet cooled to room temperature into an internal mixer, adding a vulcanizing agent, an adhesive, an accelerant and white carbon black into an internal mixing chamber when the temperature of the rubber material is raised to 75 ℃, mixing for 240 +/-30 seconds, pressing the plug for 30 seconds, lifting the plug, cleaning the vulcanizing agent accumulated on the plug, continuously mixing the rubber material after cleaning, and discharging the rubber when the temperature of the rubber material in the internal mixing chamber reaches 100 ℃;
5) the gum material was dropped onto an open mill, sheeted, cooled, and placed in a storage vessel to obtain the gum material of example 1.
The rubber diaphragm compound prepared in example 1 was tested for properties according to the relevant national standards, and the test results are shown in table 4: comparative table of performance tests for examples 1-5.
Example 2:
the raw materials are weighed according to the following formula, 40 parts of natural rubber, 15 parts of butadiene rubber, 15 parts of styrene butadiene rubber, 8 parts of synthetic eucommia rubber, 4 parts of nano zinc oxide, 0.8 part of stearic acid, 3 parts of chemical anti-aging agent, 45 parts of reinforcing agent, 2 parts of plasticizer, 1.2 parts of vulcanizing agent, 4 parts of adhesive, 1.7 parts of accelerator, 2 parts of dispersing agent, 1.5 parts of coumarone resin, 1.5 parts of microcrystalline wax and 8 parts of white carbon black.
1) Putting natural rubber, butadiene rubber, styrene-butadiene rubber, synthetic eucommia rubber, a dispersing agent, nano zinc oxide, stearic acid, microcrystalline wax, coumarone resin and a chemical anti-aging agent into an internal mixer at one time according to the formula amount, and plastifying in an internal mixing chamber for 50-60 seconds;
2) adding a reinforcing agent into the internal mixer in the step 1), mixing according to the process, wherein the mixing time is as follows: 300 +/-30 seconds;
3) when the temperature of the rubber material in the mixing chamber reaches 88-92 ℃, adding a plasticizer into the mixing chamber in the step 2), continuously mixing until the temperature reaches 130 ℃ to discharge rubber, and cooling the rubber material to room temperature;
4) putting the rubber sheet cooled to room temperature into an internal mixer, adding a vulcanizing agent, an adhesive, an accelerant and white carbon black into an internal mixing chamber when the temperature of the rubber material is raised to 75 ℃, mixing for 240 +/-30 seconds, pressing the plug for 30 seconds, lifting the plug, cleaning the vulcanizing agent accumulated on the plug, continuously mixing the rubber material after cleaning, and discharging the rubber when the temperature of the rubber material in the internal mixing chamber reaches 100 ℃;
5) the gum material was dropped onto an open mill, sheeted, cooled, and placed in a storage vessel to obtain the gum material of example 2.
The rubber diaphragm compound prepared in example 2 was tested for properties according to the relevant national standards, and the test results are shown in table 4: comparative table of performance tests for examples 1-5.
Example 3:
the raw materials are weighed according to the following formula, 50 parts of natural rubber, 20 parts of butadiene rubber, 20 parts of styrene butadiene rubber, 10 parts of synthetic eucommia rubber, 5 parts of nano zinc oxide, 1 part of stearic acid, 5.5 parts of chemical anti-aging agent, 65 parts of reinforcing agent, 6 parts of plasticizer, 1.6 parts of vulcanizing agent, 6 parts of adhesive, 1.7 parts of accelerator, 3 parts of dispersing agent, 2 parts of coumarone resin, 2 parts of microcrystalline wax and 10 parts of white carbon black.
1) Putting natural rubber, butadiene rubber, styrene-butadiene rubber, synthetic eucommia rubber, a dispersing agent, nano zinc oxide, stearic acid, microcrystalline wax, coumarone resin and a chemical anti-aging agent into an internal mixer at one time according to the formula amount, and plastifying in an internal mixing chamber for 50-60 seconds;
2) adding a reinforcing agent into the internal mixer in the step 1), mixing according to the process, wherein the mixing time is as follows: 300 +/-30 seconds;
3) when the temperature of the rubber material in the mixing chamber reaches 88-92 ℃, adding a plasticizer into the mixing chamber in the step 2), continuously mixing until the temperature reaches 130 ℃ to discharge rubber, and cooling the rubber material to room temperature;
4) putting the rubber sheet cooled to room temperature into an internal mixer, adding a vulcanizing agent, an adhesive, an accelerant and white carbon black into an internal mixing chamber when the temperature of the rubber material is raised to 75 ℃, mixing for 240 +/-30 seconds, pressing the plug for 30 seconds, lifting the plug, cleaning the vulcanizing agent accumulated on the plug, continuously mixing the rubber material after cleaning, and discharging the rubber when the temperature of the rubber material in the internal mixing chamber reaches 100 ℃;
5) the gum material was dropped onto an open mill, sheeted, cooled, and placed in a storage vessel to obtain the gum material of example 3.
The rubber diaphragm compound prepared in example 3 was tested for properties according to the relevant national standards, and the test results are shown in table 4: comparative table of performance tests for examples 1-5.
Example 4:
the raw materials are weighed according to the following formula, 60 parts of natural rubber, 25 parts of butadiene styrene rubber, 15 parts of synthetic eucommia rubber, 8 parts of nano zinc oxide, 1.5 parts of stearic acid, 6 parts of chemical anti-aging agent, 80 parts of reinforcing agent, 8 parts of plasticizer, 1.8 parts of vulcanizing agent, 8 parts of adhesive, 1.7 parts of accelerator, 5 parts of dispersing agent, 3 parts of coumarone resin, 2.5 parts of microcrystalline wax and 12 parts of white carbon black.
1) Putting natural rubber, butadiene rubber, styrene-butadiene rubber, synthetic eucommia rubber, a dispersing agent, nano zinc oxide, stearic acid, microcrystalline wax, coumarone resin and a chemical anti-aging agent into an internal mixer at one time according to the formula amount, and plastifying in an internal mixing chamber for 50-60 seconds;
2) adding a reinforcing agent into the internal mixer in the step 1), mixing according to the process, wherein the mixing time is as follows: 300 +/-30 seconds;
3) when the temperature of the rubber material in the mixing chamber reaches 88-92 ℃, adding a plasticizer into the mixing chamber in the step 2), continuously mixing until the temperature reaches 130 ℃ to discharge rubber, and cooling the rubber material to room temperature;
4) putting the rubber sheet cooled to room temperature into an internal mixer, adding a vulcanizing agent, an adhesive, an accelerant and white carbon black into an internal mixing chamber when the temperature of the rubber material is raised to 75 ℃, mixing for 240 +/-30 seconds, pressing the plug for 30 seconds, lifting the plug, cleaning the vulcanizing agent accumulated on the plug, continuously mixing the rubber material after cleaning, and discharging the rubber when the temperature of the rubber material in the internal mixing chamber reaches 100 ℃;
5) the gum material was dropped onto an open mill, sheeted, cooled, and placed in a storage vessel to obtain the gum material of example 4.
The rubber diaphragm compound prepared in example 4 was tested for properties according to the relevant national standards, and the test results are shown in table 4: comparative table of performance tests for examples 1-5.
Example 5:
the raw materials comprise, by weight, 70 parts of natural rubber, 35 parts of butadiene rubber, 35 parts of styrene-butadiene rubber, 20 parts of synthetic eucommia rubber, 10 parts of nano zinc oxide, 2 parts of stearic acid, 8 parts of chemical anti-aging agent, 90 parts of reinforcing agent, 10 parts of plasticizer, 2 parts of vulcanizing agent, 10 parts of adhesive, 1.7 parts of accelerator, 6 parts of dispersant, 5 parts of coumarone resin, 3 parts of microcrystalline wax and 15 parts of white carbon black.
1) Putting natural rubber, butadiene rubber, styrene-butadiene rubber, synthetic eucommia rubber, a dispersing agent, nano zinc oxide, stearic acid, microcrystalline wax, coumarone resin and a chemical anti-aging agent into an internal mixer at one time according to the formula amount, and plastifying in an internal mixing chamber for 50-60 seconds;
2) adding a reinforcing agent into the internal mixer in the step 1), mixing according to the process, wherein the mixing time is as follows: 300 +/-30 seconds;
3) when the temperature of the rubber material in the mixing chamber reaches 88-92 ℃, adding a plasticizer into the mixing chamber in the step 2), continuously mixing until the temperature reaches 130 ℃ to discharge rubber, and cooling the rubber material to room temperature;
4) putting the rubber sheet cooled to room temperature into an internal mixer, adding a vulcanizing agent, an adhesive, an accelerant and white carbon black into an internal mixing chamber when the temperature of the rubber material is raised to 75 ℃, mixing for 240 +/-30 seconds, pressing the plug for 30 seconds, lifting the plug, cleaning the vulcanizing agent accumulated on the plug, continuously mixing the rubber material after cleaning, and discharging the rubber when the temperature of the rubber material in the internal mixing chamber reaches 100 ℃;
5) the gum material was dropped onto an open mill, sheeted, cooled, and placed in a storage vessel to obtain the gum material of example 5.
The rubber diaphragm compound prepared in example 5 was tested for properties according to the relevant national standards, and the test results are shown in table 4: comparative table of performance tests for examples 1-5.
The component ratios for examples 1-5 are given in Table 3 below:
table 3: formulation proportioning tables of examples 1-5
The results of the performance testing of examples 1-5 are shown in Table 4 below:
table 4: comparative table for Performance test of examples 1 to 5
Comparing the performance test data for each of the examples in Table 4 above, where the combination of properties is best for example 3, it is ultimately preferred to identify formulation 3 as the inventive compound formulation.
The rubber diaphragm sizing material composition for the automobile brake chamber adopts a blending system of natural rubber, styrene-butadiene rubber, butadiene rubber and eucommia rubber as a main body, an auxiliary agent is added, the physical and mechanical properties of the prepared rubber diaphragm all reach the new standard of American Society of Automotive Engineers (SAE), the service life of a rack of the rubber diaphragm reaches more than 250 ten thousand times, the rubber diaphragm has the excellent properties of high stress at definite elongation, high tensile strength and elongation, compression and fatigue resistance, high dynamic deflection deformation resistance, high wear resistance and small change of material properties when the rubber diaphragm sizing material composition is used within a wider range of use temperature of-55-100 ℃, the service life of the rubber diaphragm sizing material composition is basically the same as that of an air brake assembly, and meanwhile, the rubber diaphragm sizing material composition has a great promotion effect on resource conservation.
The invention provides a preparation method of a rubber diaphragm sizing material composition for an automobile brake chamber, which comprises the steps of mixing all raw materials according to a certain proportion by a high-temperature internal mixer, wherein the preparation method is simple, most procedures are finished in the internal mixer, the manufacturing steps of the rubber diaphragm are reduced, the types and the number of production equipment are reduced, the production and manufacturing cost is reduced, and the production efficiency is improved.
Claims (10)
1. The rubber diaphragm sizing material composition of the automobile brake chamber is characterized in that: the composition is prepared from the following raw materials in parts by weight:
30-70 parts of natural rubber, 10-35 parts of butadiene rubber, 10-35 parts of styrene butadiene rubber, 5-20 parts of synthetic eucommia rubber, 3-10 parts of nano zinc oxide, 0.5-2 parts of stearic acid, 2-8 parts of chemical anti-aging agent, 30-90 parts of reinforcing agent, 1-10 parts of plasticizer, 1-2 parts of vulcanizing agent, 3-10 parts of adhesive, 1-3 parts of accelerator, 1-6 parts of dispersing agent, 1-5 parts of coumarone resin, 1-3 parts of microcrystalline wax and 6-15 parts of white carbon black.
2. The automotive brake chamber rubber diaphragm composition of claim 1, wherein: the composition is prepared from the following raw materials in parts by weight:
40-60 parts of natural rubber, 15-25 parts of butadiene rubber, 15-25 parts of styrene butadiene rubber, 8-15 parts of synthetic eucommia rubber, 4-8 parts of nano zinc oxide, 0.8-1.5 parts of stearic acid, 3-6 parts of chemical anti-aging agent, 45-80 parts of reinforcing agent, 3-8 parts of plasticizer, 1.2-1.8 parts of vulcanizing agent, 4-8 parts of adhesive, 1-2 parts of accelerator, 2-5 parts of dispersing agent, 1.5-3 parts of coumarone resin, 1.5-2.5 parts of microcrystalline wax and 8-12 parts of white carbon black.
3. The automotive brake chamber rubber diaphragm composition of claim 1, wherein: the composite material mainly comprises the following raw materials in parts by weight:
50 parts of natural rubber, 20 parts of butadiene rubber, 20 parts of styrene-butadiene rubber, 10 parts of synthetic eucommia rubber, 5 parts of nano-zinc oxide, 1 part of stearic acid, 5.5 parts of chemical anti-aging agent, 65 parts of reinforcing agent, 6 parts of plasticizer, 1.6 parts of vulcanizing agent, 6 parts of adhesive, 1.7 parts of accelerator, 3 parts of dispersant, 2 parts of coumarone resin, 2 parts of microcrystalline wax and 10 parts of white carbon black.
4. The rubber diaphragm composition for automobile brake chambers as claimed in any one of claims 1 to 3, wherein: the chemical anti-aging agent comprises, by weight, 1 parts of anti-aging agent 4010NA, 1.5 parts of anti-aging agent RD, 1 part of anti-aging agent BLE-W and 2 parts of anti-fatigue agent PL-6002.
5. The rubber diaphragm composition for automobile brake chambers as claimed in any one of claims 1 to 3, wherein: the reinforcing agent consists of N33045 parts of high-abrasion carbon black and N55020 parts of fast-extrusion carbon black in parts by weight.
6. The rubber diaphragm composition for automobile brake chambers as claimed in any one of claims 1 to 3, wherein: the accelerant consists of 1 part of accelerant CZ, 0.5 part of accelerant DTDM and 0.2 part of accelerant TMTD in parts by weight.
7. The rubber diaphragm composition for automobile brake chambers as claimed in any one of claims 1 to 3, wherein: the vulcanizing agent is insoluble sulfur, and the plasticizer is paraffin oil.
8. The rubber diaphragm composition for automobile brake chambers as claimed in any one of claims 1 to 3, wherein: the adhesive is an adhesive RC, the dispersing agent is a dispersing agent RPD-100, and the microcrystalline wax is microcrystalline wax 9332F.
9. A process for preparing a composition according to any one of claims 1 to 3, comprising in particular the steps of:
1) putting natural rubber, butadiene rubber, styrene-butadiene rubber, synthetic eucommia rubber, a dispersing agent, nano zinc oxide, stearic acid, microcrystalline wax, coumarone resin and a chemical anti-aging agent into an internal mixer at one time according to the formula amount, and plastifying for 45-65 seconds in an internal mixing chamber;
2) adding a reinforcing agent into the internal mixer in the step 1), mixing according to the process, wherein the mixing time is as follows: 280 +/-30-350 +/-30 seconds;
3) when the temperature of the rubber material in the mixing chamber reaches 80-95 ℃, adding a plasticizer into the mixing chamber in the step 2), continuously mixing until the rubber is discharged at 120-140 ℃, and cooling the rubber material to room temperature;
4) putting the rubber sheet cooled to room temperature into an internal mixer, adding a vulcanizing agent, an adhesive, an accelerant and white carbon black into an internal mixing chamber when the temperature of the rubber material rises to 65-85 ℃, mixing for 220 +/-30-260 +/-30 seconds, pressing a bolt for 25-35 seconds, lifting the bolt, cleaning the vulcanizing agent accumulated on the bolt, continuously mixing the rubber material after cleaning is finished, and discharging the rubber when the temperature of the rubber material in the internal mixing chamber reaches 95-115 ℃;
5) and (3) dropping the rubber material on an open mill, tabletting, cooling and loading into a storage device to obtain the rubber material.
10. A process for preparing a composition according to any one of claims 1 to 3, comprising in particular the steps of:
1) putting natural rubber, butadiene rubber, styrene-butadiene rubber, synthetic eucommia rubber, a dispersing agent, nano zinc oxide, stearic acid, microcrystalline wax, coumarone resin and a chemical anti-aging agent into an internal mixer at one time according to the formula amount, and plastifying in an internal mixing chamber for 50-60 seconds;
2) adding a reinforcing agent into the internal mixer in the step 1), mixing according to the process, wherein the mixing time is as follows: 300 +/-30 seconds;
3) when the temperature of the rubber material in the mixing chamber reaches 88-92 ℃, adding a plasticizer into the mixing chamber in the step 2), continuously mixing until the temperature reaches 130 ℃ to discharge rubber, and cooling the rubber material to room temperature;
4) putting the rubber sheet cooled to room temperature into an internal mixer, adding a vulcanizing agent, an adhesive, an accelerant and white carbon black into an internal mixing chamber when the temperature of the rubber material is raised to 75 ℃, mixing for 240 +/-30 seconds, pressing the plug for 30 seconds, lifting the plug, cleaning the vulcanizing agent accumulated on the plug, continuously mixing the rubber material after cleaning, and discharging the rubber when the temperature of the rubber material in the internal mixing chamber reaches 100 ℃;
5) and (3) dropping the rubber material on an open mill, tabletting, cooling and loading into a storage device to obtain the rubber material.
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| CN202210881614.XA CN115058069A (en) | 2020-01-21 | 2020-01-21 | Rubber diaphragm sizing material composition for automobile brake chamber and preparation method thereof |
| CN202010070122.3A CN111171394A (en) | 2020-01-21 | 2020-01-21 | Rubber diaphragm sizing material composition for automobile brake chamber and preparation method thereof |
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| CN114106423A (en) * | 2021-11-08 | 2022-03-01 | 宁国市海天力工业发展有限公司 | Heat-resistant and cold-resistant air chamber rubber diaphragm material and preparation method thereof |
| CN114479208A (en) * | 2022-02-15 | 2022-05-13 | 贵州大众橡胶有限公司 | Rubber diaphragm sizing material for automobile brake chamber and preparation method thereof |
| CN114292513B (en) * | 2021-12-29 | 2023-09-19 | 宁波泰科威橡胶科技有限公司 | High-tolerance intake manifold membrane and preparation method thereof |
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| CN115058069A (en) | 2022-09-16 |
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Application publication date: 20200519 |