阅读说明：本技术 一种同时采用硫化剂和软化剂的炼胶配方及生产工艺 (rubber mixing formula adopting vulcanizing agent and softening agent simultaneously and production process ) 是由 刘仲秋 于 2019-07-18 设计创作，主要内容包括：本发明公开了一种同时采用硫化剂和软化剂的炼胶配方及生产工艺,属于炼胶领域,该炼胶配方由以下重量份数的原料混合制备而成：橡胶100份、硬脂酸1.2份、B-801 4份、石蜡0.5份、PEG-4000 0.5份、防老剂4010NA 1份、RD 1份、RL-10 2份、氧化镁8份、氧化锌8份、软化剂8份、硫化剂2.8份。本发明能够使各种原料充分混合,使胶料的各种性能得到改进,显著延长了胶料的焦烧时间,提高氯丁橡胶混炼胶料的焦烧性能,保证胶料的加工安全,降低门氏粘度,橡胶的拉伸强度得到了显著优化,胶料的储藏性能也得到了进一步的改进,方便运输和加工。(the invention discloses a rubber mixing formula simultaneously adopting a vulcanizing agent and a softening agent and a production process, belonging to the field of rubber mixing, wherein the rubber mixing formula is prepared by mixing the following raw materials in parts by weight: 100 parts of rubber, 1.2 parts of stearic acid, 0.5 part of B-8014 part of paraffin, 0.5 part of PEG-40000.5 parts of anti-aging agent 4010NA 1 part, 1 part of RD, 8 parts of RL-102 part of magnesium oxide, 8 parts of zinc oxide, 8 parts of softener and 2.8 parts of vulcanizing agent. The invention can fully mix various raw materials, improve various performances of the rubber material, obviously prolong the scorching time of the rubber material, improve the scorching performance of the chloroprene rubber mixed rubber material, ensure the processing safety of the rubber material, reduce the Mohs viscosity, obviously optimize the tensile strength of the rubber, further improve the storage performance of the rubber material and facilitate transportation and processing.)

1. a rubber mixing formula simultaneously adopting a vulcanizing agent and a softening agent is characterized in that: the material is prepared by mixing the following raw materials in parts by weight:

mother rubber: 80 parts of chloroprene rubber and 20 parts of raw rubber;

Small medicine: 1.2 parts of stearic acid, 0.5 part of paraffin, 0.5 part of acrylic resin B-8014 part of PEG-40000.5 parts of anti-aging agent 4010NA 1 part, 1 part of anti-aging agent RD, 8 parts of RL-102 part, 8 parts of magnesium oxide and 8 parts of zinc oxide;

And (3) large material: carbon black N33030 parts, white carbon black 35510 parts;

Auxiliary materials: 8 parts of softener and 2.8 parts of vulcanizing agent.

2. A rubber composition using both a vulcanizing agent and a softening agent as claimed in claim 1, wherein: the vulcanizing agent is prepared from the following raw materials in parts by weight: 0.8 part of sulfur, 0.8 part of DM and NA-228 parts.

3. The process according to claim 1, wherein the vulcanizing agent and the softener are used simultaneously, and the process comprises the following steps: comprises the following steps which are carried out in sequence:

s1, adding the masterbatch components in parts by weight into an internal mixer for mixing, adding the small medicine components and the large material components when the temperature rises to 65 ℃, and discharging after the temperature rises to 110 ℃ to obtain a section of masterbatch;

S2: tabletting the primary masterbatch obtained in the step S1 on an open mill, standing, and cooling to room temperature;

S3: the first-stage masterbatch cooled to room temperature in the step S2 is remixed in an internal mixer, the temperature is set to be 130-135 ℃, and the mixing time is 6 minutes, so that second-stage masterbatch is obtained;

s4, tabletting the secondary masterbatch obtained in the step S3 on an open mill, standing, and cooling to room temperature;

S5, adding the two-stage masterbatch cooled to room temperature in the step S4 and the auxiliary material components in parts by weight into an internal mixer for mixing, wherein the mixing temperature is 65 ℃, the mixing pressure is 15-20 MPa, and discharging after mixing for 3 minutes to obtain vulcanized rubber;

S6: and (5) tabletting the vulcanized rubber in the step S5 on an open mill, standing, and cooling to room temperature to obtain the finished rubber.

4. The process according to claim 3, wherein the vulcanizing agent and the softener are simultaneously used, and the process comprises the following steps: the internal mixer comprises a driving motor (1), a reduction gearbox (2), a coupler (3) and an internal mixing chamber (4) which are sequentially connected, wherein a feeding device (401), a discharging device (402) and a heating and gas conveying pipeline (403) are arranged on the internal mixing chamber (4), two rotors (5) are arranged in the internal mixing chamber (4), the rotating axes of the two rotors (5) are parallel to each other, each rotor (5) comprises a roll shaft (501), and two ends of each roll shaft (501) are respectively and rotatably connected with bearings arranged in the internal mixing chamber (4); the roller shaft (501) is externally provided with a spiral roller piece (502), the spiral roller piece (502) is provided with a plurality of auxiliary mixing blocks (503), the auxiliary mixing blocks (503) are connected with the edge of the spiral roller piece (502) through springs (504), and bulges are uniformly arranged on the auxiliary mixing blocks (503).

5. the process according to claim 3, wherein the vulcanizing agent and the softener are simultaneously used, and the process comprises the following steps: the rotor speed and the filling factor were kept constant during the mixing in the internal mixer at 70rpm and 0.75, respectively.

Technical Field

The invention belongs to the field of rubber mixing technology, and relates to a rubber mixing formula simultaneously adopting a vulcanizing agent and a softening agent and a production process.

background

in the processing of rubber, the process of processing raw rubber into rubber having appropriate plasticity by using mechanical force, heat, oxygen or adding some chemical agents to transform the raw rubber from a tough and highly elastic state into a soft and plastic state is generally called rubber compound.

In the existing rubber mixing process, the physical properties of the finished rubber are easy to change in the long-term storage and transportation processes, and the problem of uneven mixing of various raw materials exists in the production process, so that various properties of the rubber produced by the added auxiliary materials are insufficient.

Disclosure of Invention

The invention aims to: provides a rubber compound formula adopting a vulcanizing agent and a softening agent simultaneously and a production process, and solves the problems mentioned in the background technology.

The technical scheme adopted by the invention is as follows:

a rubber mixing formula simultaneously adopting a vulcanizing agent and a softening agent is prepared by mixing the following raw materials in parts by weight:

mother rubber: 80 parts of chloroprene rubber and 20 parts of raw rubber;

Small medicine: 1.2 parts of stearic acid, 0.5 part of paraffin, 0.5 part of acrylic resin B-8014 part of PEG-40000.5 parts of anti-aging agent 4010NA 1 part, 1 part of anti-aging agent RD, 8 parts of RL-102 part, 8 parts of magnesium oxide and 8 parts of zinc oxide;

and (3) large material: carbon black N33030 parts, white carbon black 35510 parts;

auxiliary materials: 8 parts of softener and 2.8 parts of vulcanizing agent.

in the existing rubber mixing process, the physical properties of the finished rubber are easy to change in the long-term storage and transportation processes, and the problem of uneven mixing of various raw materials exists in the production process, so that various properties of the rubber produced by the added auxiliary materials are insufficient. The invention relates to a rubber mixing formula simultaneously adopting a vulcanizing agent and a softening agent, which comprises the following steps:

the chloroprene rubber has better oil resistance, heat resistance, flame resistance, sunlight resistance and corrosion resistance.

Stearic acid plays a role in the rubber processing: firstly, zinc stearate generated by the reaction with zinc oxide plays a role of an activator, secondly plays a role of a softener, and thirdly prevents roller sticking and scorching in natural rubber and neoprene.

B-801 is acrylic resin, and plays a role in a rubber mixing process: firstly, the initial viscosity and the permanent viscosity are good, the raw viscosity is improved, the Mooney viscosity of rubber is reduced, and the vulcanization time and the physical properties after vulcanization are not influenced; secondly, the hardness and modulus of the vulcanization point are reduced, the extensibility is improved, and the spalling resistance is improved; thirdly, the rubber strength and the aging resistance are improved, and the adhesion to a processing machine is avoided; fourthly, the uniform distribution of the filling material is assisted.

The paraffin can be separated out from the rubber surface in the rubber mixing process to form a protective film. The molecular weight of the paraffin is much lower than that of rubber, and the molecular chain of the paraffin is easy to enter the space between rubber molecular chains after the paraffin is added, so that the rubber molecular chains are easy to slide; the paraffin has the lubricating effect, improves the extrusion performance, and reduces the shrinkage: the paraffin wax makes the sizing material easier to mix evenly: the paraffin enters between rubber molecular chains, expands the distance between the rubber molecular chains, and carries low-molecular compounding agents such as the rubber molecular chains, so that other compounding agents are more easily dispersed.

PEG-4000 is polyethylene glycol, which acts during rubber processing: firstly, the processing aid has the effects of improving the extrusion speed of rubber materials, improving the demolding performance and playing a role in lubrication, so that the surface of a rubber finished product is smoother; secondly, the acidity of various raw materials is neutralized, the vulcanization speed and the crosslinking density are accelerated, and the water-soluble polyurethane rubber has good water solubility and can be dissolved with various raw materials.

the anti-aging agent 4010NA has low melting point and is easy to disperse in rubber materials, the aim of uniform dispersion can be achieved by mixing with an internal mixer and an open mill, and the anti-aging agent has an activation effect on the accelerator DM.

The anti-aging agent RD is suitable for natural rubber and synthetic rubber such as butyronitrile, butylbenzene, ethylene propylene, chloroprene rubber and the like. Has excellent effect of preventing aging caused by heat and oxygen. And the anti-aging agent is used together with the anti-aging agent 4010NA to form a protection system with ideal anti-thermal-oxidative aging, ozone aging and dynamic fatigue effects.

RL-10 is a polar flow dispersant; the lubricity between the inside and outside of the mixed raw material is improved, thereby improving the fluidity and the mold release property. Improve the dispersibility among various raw materials, reduce the variability and improve the stability.

the magnesium oxide can improve the scorching performance of the rubber material and is beneficial to storing the rubber compound; can improve the strength and tensile strength of the stretching stress of the vulcanized rubber.

The zinc oxide is a vulcanization accelerating assistant, and can improve the vulcanization efficiency of the rubber.

Carbon black N330 can reduce the shrinkage and coefficient of thermal expansion of the rubber.

The white carbon black 355 is used together with carbon black, so that the vulcanized rubber has the characteristics of high strength, high elongation, high tearing strength, high hardness and good insulativity.

the softening agent adopts dioctyl ester, so that the plasticity of the rubber material can be increased, the viscosity of the rubber material and the temperature during mixing are reduced, the dispersity and the mixing property are improved, and the tensile strength, the elongation and the wear resistance of vulcanized rubber are improved.

the vulcanizing agent is used for the vulcanization reaction of rubber, and a space three-dimensional structure is formed in the vulcanized raw rubber, so that the vulcanized raw rubber has high elasticity, heat resistance, tensile strength and insolubility in an organic solvent.

Further, the vulcanizing agent is prepared from the following raw materials in parts by weight: 0.8 part of sulfur, 0.8 part of DM and NA-228 parts.

Sulfur is used as a vulcanization raw material, and the linear high molecular structure can be changed into a body high molecular structure through vulcanization. Because sulfur can be connected between two macromolecular chains in a covalent bond mode, the two macromolecular chains are changed into T-shaped, and the performance of the rubber is enhanced. The vulcanized raw rubber forms a spatial three-dimensional structure and has high elasticity, heat resistance, tensile strength and insolubility in an organic solvent.

DM is a vulcanization accelerator, a substance capable of accelerating vulcanization. Can shorten the vulcanizing time, reduce the vulcanizing temperature, reduce the consumption of vulcanizing agents, improve the physical and mechanical properties of rubber and the like.

NA-22 is a vulcanization accelerator which, in combination with accelerator DM, improves scorch resistance. The obtained vulcanized rubber has high stress at definite elongation, small compression deformation, and good elasticity and heat resistance.

a production process simultaneously adopting a vulcanizing agent and a softening agent comprises the following steps of:

S1, adding the masterbatch components in parts by weight into an internal mixer for mixing, adding the small medicine components and the large material components when the temperature rises to 65 ℃, and discharging after the temperature rises to 110 ℃ to obtain a section of masterbatch;

s2: tabletting the primary masterbatch obtained in the step S1 on an open mill, standing, and cooling to room temperature;

S3: the first-stage masterbatch cooled to room temperature in the step S2 is remixed in an internal mixer, the temperature is set to be 130-135 ℃, and the mixing time is 6 minutes, so that second-stage masterbatch is obtained;

S4, tabletting the secondary masterbatch obtained in the step S3 on an open mill, standing, and cooling to room temperature;

S5, adding the two-stage masterbatch cooled to room temperature in the step S4 and the auxiliary material components in parts by weight into an internal mixer for mixing, wherein the mixing temperature is 65 ℃, the mixing pressure is 15-20 MPa, and discharging after mixing for 3 minutes to obtain vulcanized rubber;

S6: and (5) tabletting the vulcanized rubber in the step S5 on an open mill, standing, and cooling to room temperature to obtain the finished rubber.

Furthermore, the internal mixer comprises a driving motor, a reduction gearbox, a coupler and an internal mixing chamber which are sequentially connected, wherein a feeding device, a discharging device and a heating and steam conveying pipeline are arranged on the internal mixing chamber, two rotors are arranged in the internal mixing chamber, the rotating axes of the two rotors are parallel to each other, the rotors comprise roll shafts, and two ends of each roll shaft are respectively in rotary connection with bearings arranged in the internal mixing chamber; the roller shaft is provided with the spiral roller piece outward, be provided with the supplementary mixed piece of a plurality of on the spiral roller piece, supplementary mixed piece passes through the edge connection of spring with the spiral roller piece, evenly be provided with the arch on the supplementary mixed piece.

The upper part of the mixing chamber is provided with an upper ram controlled by a cylinder, the lower part of the mixing chamber is provided with a lower ram controlled by a hydraulic system, steam or cooling water can be added into a cavity formed by a wall cavity of the mixing chamber and the upper ram and the lower ram together, and the mixing chamber is heated and cooled according to the processing requirement. The rotor in the mixing chamber is used for mixing materials, the two ends of the rotor are in running fit with bearing seats arranged on the two sides of the mixing chamber, and the two end faces are provided with sealing devices to prevent leakage of powdery materials. The rotor is provided with a starting internal mixer, the rotor in the internal mixing chamber is driven by a driving motor through a reduction gearbox and a coupler to start working, and the rotor starts rotating. Adding materials into the feeding device, and enabling the materials to enter the banburying chamber. The rotor is provided with a plurality of auxiliary mixing blocks, and the auxiliary mixing blocks are connected with the spiral roller sheets of the rotor through springs. Two rotor coupling works, when two rotors cooperate the extrusion stirring material jointly, supplementary mixing block is extrudeed simultaneously, and the spring is compressed, and the spring has the restoring force, and supplementary mixing block carries out co-extrusion to the material simultaneously, is provided with the arch on it, can further increase the area of contact with the material, extrudees the misce bene simultaneously, makes the material homogeneous mixing. And discharging the materials from a discharging device at the bottom after the materials are mixed and plasticized in the mixing chamber. By adopting the device, the mixing efficiency is improved, the rubber is more fully vulcanized, and the performance of the rubber is better.

Further, the rotor speed and the packing factor were kept constant during the mixing in the internal mixer at 70rpm and 0.75, respectively.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. according to the rubber compound formula simultaneously adopting the vulcanizing agent and the softening agent, the vulcanizing agent and the softening agent are simultaneously added, so that the scorching time of the rubber compound is obviously prolonged, the Mohs viscosity is reduced, the tensile strength of the rubber is obviously optimized, the storage performance of the rubber compound is further improved, and the transportation and the processing are convenient.

2. according to the rubber mixing production process adopting the vulcanizing agent and the softening agent simultaneously, the internal mixer with the auxiliary mixing block is arranged, so that various raw materials can be fully mixed compared with the conventional internal mixer, and various performances of rubber materials are further improved.

drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:

FIG. 1 is a schematic view of the overall structure of an internal mixer;

FIG. 2 is a schematic diagram of the overall structure of the mixing chamber;

FIG. 3 is a schematic view of the structure of the rotor;

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

the labels in the figure are: 1-driving motor, 2-reduction gearbox, 3-coupler, 4-banburying chamber, 401-feeding device, 402-discharging device, 403-heating steam conveying pipeline, 5-rotor, 501-roll shaft, 502-spiral roller sheet, 503-auxiliary mixing block, 504-spring, 6-upper top bolt and 7-lower top bolt. .

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 the following embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Thus, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

it is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.