Dalian Qiucheng Rubber Products Co., Ltd
Address: Tuchengzi Sanjianpu Lvshun District, Dalian China


Rubber production process
author£º Publish in£º2017/6/21 10:31:56 Click amount£º

First, the basic process
There are many types of rubber, but the process of consumption is basically the same. The basic process of rubber products with ordinary solid rubber and raw rubber as raw materials includes six basic processes of plasticizing, kneading, calendering, pressing, forming and vulcanizing. Of course, the original data preparation, waste finishing, inspection and packaging and other fundamental processes are indispensable. The process of rubber processing is mainly dealing with plastic and elastic properties of this contradictory process. After a variety of craft wrist, making the elastic rubber into a plastic plastic with plastic, and then participate in a variety of ingredients made of semi-waste, and then after the vulcanization of plastic semi-waste has become high elasticity, good physical and mechanical properties rubber products.
Second, the original data preparation
1. The main raw material of rubber products is raw rubber as the basic information, and raw rubber is growing in the tropical, subtropical rubber tree after artificially cut bark collected.
2. Various compounding agents are auxiliary materials to improve certain properties of rubber products.
3. Fiber materials are (cotton, linen, wool and all kinds of man-made fibers, synthetic fibers and metal materials, steel wire) is the skeleton of rubber products to enhance the mechanical strength, limiting product variants. Ingredients must be accurately weighed according to the formula during the preparation of the original material. In order to make the raw rubber and the agent can be mixed with each other, the demand for data to stop processing. Raw rubber to be in the 60 - 70 ¡æ drying room after drying soft and then cut rubber, broken into small pieces, with a mixture of block. Such as paraffin, stearic acid, rosin, etc. to be crushed. If the powder contains the mechanical impurities or coarse grain when the need to select the removal of liquid such as pine tar, Gu Ma Long demand heating, condensation, evaporation of water, filter impurities, with the agent to stop the boring or easy to agglomerate, if not scattered when kneading Vulcanization of the average vulcanization will affect the quality of production
Third, plastic refining
Raw rubber is flexible and lacks the plastic properties necessary for processing and is therefore not easy to process. In order to improve its plasticity, so the raw rubber to stop the plastic, so that when the mixing agent is easy to evenly dispersed in the raw rubber, while in the calendering process is also conducive to the progress of the infiltration of rubber infiltration into the fabric And forming activity. The process of degrading the long-chain molecules of raw gums constitutes plasticity. There are two kinds of plastic plastic molding and plastic molding. Mechanical mastication is the effect of mechanical squeezing and friction of the plasticizer at a very low temperature to shorten the degradation of the long chain rubber molecules from a high elastic state to a plastic state. Thermoforming is the introduction of hot air into the hot air under the action of heat and oxygen to shorten the degradation of long-chain molecules in order to obtain plasticity.
Four, mixing
In order to comply with a variety of different conditions of use, to obtain a variety of different performance, but also to improve the performance of rubber products and reduce the cost of raw rubber must participate in different match agent. Mixing is the plastic blend of raw rubber and mix with the mixture, placed in the mixing machine through the mechanical mixing effect with the agent complete and evenly dispersed in the raw rubber in a process. Mixing is the rubber products in the consumption process of an important process, if the mixed is not uniform can not play the role of rubber and complex with the impact of product performance. Kneaded after the compound known as the compound of rubber It is the manufacture of various rubber products, semi-waste information, commonly known as rubber products are usually used as a commodity seller can apply the direct processing of rubber molding, vulcanization made of the required rubber Products. Depending on the formulation, the blend has a range of different grades and types of performance.
Five, forming
In the consumption of rubber products in the process of application of calendering machine or extruder made of all kinds of shapes, different sizes of the process called the molding. There are ways to shape
1. calendering
Suitable for the manufacture of simple sheet, plate products. It is the rubber pressed into a certain shape by pressing machine, a certain size of the film is called rolling forming. Some rubber products such as tires, tape, hose and other textile fiber materials must be coated with a layer of thin glue in the fiber coating is also called glue or rubbing plastic coating process is also generally completed on the calender. The fiber material is required to stop the drying and dipping drying before calendering in order to reduce the moisture content of the fiber material to prevent moisture from evaporating and to increase the temperature of the fiber material to ensure the quality of the calendering process. Dipping is hanging before the necessary process is intended to improve the separation of fiber materials and rubber properties.
2. Press out
For the more complex rubber products like tire tread, hose, wire surface coating needs of the use of extrusion molding method of manufacturing. It is a plastic with a certain plastic into the extruder hopper in the extrusion of the screw through a variety of mouth type also called an example to stop the continuous appearance of a way. Before pressing out the rubber material must be stopped preheating to make the compound soft, easy to squeeze out to get the appearance of lubrication, the size of the exact rubber products.
3. Molding
Can also be used to create some of the shape of the complex shape, such as leather cups, seals rubber products? With the formation of the yin and yang mold will be placed in the mold heating molding.
Sixth, vulcanization
The process of converting plastic rubber into elastic rubber is called vulcanization. It is a certain amount of vulcanizing agent such as sulfur, vulcanization accelerator and so on to participate in the semi-waste made of raw rubber in the curing tank to stop in the regular temperature heating, So that the linear molecules between the raw rubber through the formation of "sulfur bridge" and cross-linked to the plane of the network structure so that the plastic compound into a high elasticity of the vulcanized rubber. Since the crosslinking bond is mainly composed of sulfur, it is called "vulcanization". With the rapid development of synthetic rubber vulcanizing agent is now a lot of types in addition to sulfur, there are organic polysulfide, peroxide, metal oxides and so on. Thus, the process of elastic rubber, which makes the linear structure of the plastic rubber into a planar mesh structure, is called vulcanization. The material that acts as a "bridging" in the rubber material is called a "vulcanizing agent". After the vulcanization of rubber called vulcanized rubber, also known as soft rubber commonly known as "rubber." Vulcanization is one of the most important processes in rubber processing. Various rubber products must be vulcanized to achieve the desired performance. Vulcanized rubber in the use of what is the value of the use, but the level of sulfur is not enough sulfur curing time is not enough to reach the best condition and over-sulfur sulfide time beyond the performance of significant landing rubber properties are landing. So the consumption process must be strictly control the curing time to ensure that the vulcanized rubber products with the best performance and the most lasting service life.
Seven, auxiliary measures
In order to achieve the use of performance should also be added in the consumption process auxiliary measures
1. Increased strength - with hard carbon black mixed with phenolic resin
2. Increased abrasion resistance - with hard carbon black
3. Air tightness request high - less volatile components
4. Increased heat resistance - New vulcanization process
5. Increase the cold resistance - after the raw rubber of the mosaic? Decrease the tendency of crystallization? The use of low temperature plasticizer
6. Increase the flame resistance - no flammable aids, less softener, the use of flame retardants such as antimony trioxide
7. Increase the oxygen resistance, ozone resistance - the use of diamine protective agent
8. Progressive electrical insulation - with high structural fillers or metal powder with antistatic agent
9. Progressive magnetic - the use of strontium ferrite powder aluminum iron powder iron barium powder as filler
10. Progressive water resistance - the use of lead oxide or resin vulcanization system with less absorbent filler such as barium sulfate, clay
11. Progressive oil resistance - Adequate cross-linking, less plasticizer
12. Progress in acid and alkali resistance - multi-purpose filler
13. Progressive high vacuum - with volatile small additives
14. Reduce the hardness - a large number of filling softener.
8, rubber products vulcanization of the problem
1. What are the toxic gases produced when vulcanizing rubber products? Rubber vulcanization process using oven semi-block vulcanized rubber will have a trace of toxic gas can smell a heavy smell of rubber. For example, sulfur monoxide, sulfur dioxide, sulfur trioxide, hydrogen sulfide gas, although the highly toxic things are fundamentally not harmful to the human body Some products will produce carcinogenic vulcanization or self before vulcanization of the rubber there is the best carcinogenic components less contact As well Rubber vulcanization of the organic reagents used more or less harmful to the human body. Such as dimethylbenzene and the like
2. Ordinary rubber vulcanization temperature is a few common for 115 degrees to 180 degrees to see what kind of rubber may be. While the temperature of 200 degrees is high temperature vulcanization.
3. What are the hazards of sulfur dioxide? Risk Category - Three-star invasive pathways through the respiratory system, well-being of the dampness of the mucous membrane is easy to absorb the formation of sulfurous acid, sulfuric acid. Eye and respiratory mucosa have a strong stimulating effect. A large number of inhalation can cause pulmonary edema, laryngeal edema, vocal cords spasm caused by suffocation. Acute poisoning mild poisoning when the onset of tears, photophobia, cough, throat burning and other serious poisoning can be issued within a few hours of pulmonary edema inhalation can cause reflex glottic spasm caused by suffocation. Skin or eye contact with inflammation or burns. Chronic effects of long-term low concentrations of contact can have headache, dizziness, fatigue and other systemic diseases and chronic rhinitis, pharyngitis, bronchitis, smell and taste loss. Environmental hazards can form serious pollution to the atmosphere.

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