Rubber production process
    Update Time:2015/12/1 17:14:35
One, the basic technological process
Rubber product variety, but the production process are basically the same. The basic process of rubber products in general solid rubber -- rubber as raw material includes: plastication, mixing, calendering, extruding, molding, curing 6 basic processes. Of course, raw material preparation, finishing product, inspection and packaging and other basic procedures are not. The machining process of rubber is mainly to solve the process of plastic and elastic properties of this contradiction. Through a variety of techniques, which makes the elastic rubber into a plastic rubber of, then add various coordination agent made of semi-finished products, and then through the vulcanization made with semi finished products of plastic and rubber products, become the high elasticity of physical and mechanical properties of good.
Prepare two, raw materials
The main raw material of rubber products is 1 to rubber as basic material, and rubber is grown in tropical and subtropical, the rubber tree bark collected by artificial cut.
2 a variety of ingredients, is the auxiliary materials in order to improve some of the performance of rubber products and join the.
3 materials (cotton, linen, wool and a variety of synthetic fiber, synthetic fiber and metal materials, steel wire) is used as a skeleton material for rubber products, to enhance the mechanical strength, limit the product variant. In the raw material in the process of preparing the ingredients must be in accordance with the formula accurate weighing. In order to make the rubber and the complexing agent can be evenly mixed each other, need to process material. Rubber to at 60--70 deg.c drying room drying soft then gel, gel breaking into pieces, with a massive agent. Such as wax, stearic acid, rosin to smash. If powder containing mechanical impurities or need coarse screening to remove when liquid such as pine tar, Gu Malone needs heating, melting, evaporation of water, filtered impurities, complexing agent to dry or easy to agglomerate, mixing if not evenly dispersed sulfide generated when the bubble will affect the quality of products
Three, Plasticating
Rubber elasticity, the lack of the necessary processing plasticity properties, therefore not easy processing. In order to improve its plasticity, so to rubber plasticated, so the mixing of the complexing agent is easy to disperse uniformly in the rubber, which also helps to improve the permeability of the fiber fabric glue infiltration in liquidity in the rolling and molding, molding process. The long chain molecular degradation of rubber forming process of plasticity called plasticization. Mechanical plasticization and thermoplastic tried two methods of rubber plasticization. Mechanical mastication is the long chain molecule rubber degradation becomes shorter by the high elastic state into the plastic state by plastic refining machine mechanical extrusion and friction effect in not too high a temperature. Thermal plasticization is burning access to raw rubber of compressed air in the heat and oxygen under the effect of the long chain molecular degradation shorter to obtain plasticity.
Four, mixing
In order to adapt to the 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 coordination agent must be added in different in rubber. Mixing is the mastication after the raw rubber and compound mixing, placed in the rubber mixing machine by mechanical mixing function makes the coordination agent fully, uniformly dispersed in rubber in a process. Mixing is an important process of rubber products in the production process, if uneven mixing cannot give full play to the role of rubber and a complexing agent influence the performance of the products. Sizing people get after mixing the said manufacturing all kinds of rubber mix it is semi-finished materials, commonly known as rubber rubber products are usually sold as a commodity buyers can directly process the material, need to use rubber vulcanization. According to the different formulation? Mix different brands and varieties have a series of different properties provide choice?.

Five, forming

The process uses rolling machine or extruder made in advance, the shape of every kind of different sizes in the production process of rubber products in? Called molding. Forming method is
1 calendering
Applicable to the manufacture of simple sheet, plate products. It is the method for mixing rubber pressed into a certain shape and a certain size of the film through the calender called calendering. Some rubber products such as tires, tape, rubber hose? By other textile fiber material must be coated with a thin layer of glue on the fiber coating also called paste glue or eraser?? gluing procedure generally performed also in calender. Fiber materials need to be dry and dipping drying objective is to reduce the moisture content of the fiber material to avoid evaporation foaming in rolling before? And improve fiber material temperature to ensure the quality of rolling process. Dipping is a necessary step before hanging glue is designed to improve the binding properties of fiber material and rubber material.
2 extrusion molding
Used in rubber products is more complex? Like a tire tread, rubber hose, metal wire surface coating needs to use the method of extrusion molding manufacturing. It is to a certain plastic mix into the inner screw extruder extrusion hopper under through a variety of mouth is also called template method for continuous modeling. Glue should be preheated to the soft rubber, rubber products easy to be extruded to obtain smooth and accurate pressure before.
3 molding
Can also be used to manufacture some complex shape molding methods such as cup, a sealing ring rubber? With the help of yin and Yang of die forming glue placed heating molding in the mold.
Six, sulfide
The plastic rubber into the process of elastic rubber vulcanization vulcanizing agent called it is to a certain amount, such as sulfur vulcanization accelerator is added to the semi-finished products made by rubber heating, in the specified temperature for making linear molecular rubber to form a "sulfur bridge" and cross-linked with each other into a three-dimensional network structure and it can make the rubber plastic into vulcanized rubber with high elasticity in a vulcanizing tank. Due to the crosslinking bond is mainly composed of so called "by sulfur vulcanization". With the rapid development of synthetic rubber vulcanizing agent of many varieties now in addition to sulfur and organic sulfides, peroxide, metal oxide etc.. So who can make the linear structure of plastic rubber into the process of elastic rubber and three-dimensional network structure are called vulcanization who can afford the "bypass" role in the rubber material are referred to as "curing agent". Elastic rubber vulcanization after the call of vulcanized rubber is also called soft rubber commonly known as "rubber". Vulcanization is one of the most important process of various rubber products must pass to obtain the ideal performance of vulcanized rubber processing. Without the vulcanization of rubber in use is not what the use value, but less sulfur vulcanization degree is not enough? Vulcanization time enough to reach the best state and sulfur vulcanization time over, significant performance deterioration make rubber performance degradation. So the production must be strictly controlled in the process of vulcanization time? To ensure that the rubber vulcanization after the application performance of the best and most long service life.
Seven, the auxiliary measures
In order to achieve the use of performance should also increase the auxiliary measures in production process
1 increase strength -- with hard carbon black mixed with phenolic resin
2 increased wear resistance - with hard carbon black
3 air tightness requirements of high - less volatile components with high
4 increase the vulcanization process heat resistance - using a new
5 increased cold tolerance -- through the branches of the raw embedded solution crystallization tendency? Reduce? The use of low temperature resistant plasticizer
The 6 increase in flame resistance - no flammable additives, use less softener, the use of flame retardants such as three antimony oxide
7 increase the oxygen resistance, ozone resistance, using two amine protective agent
8 to improve the electrical - with high structural filler or metal powder with antistatic agent insulation
9 to improve the magnetic strontium ferrite powder with aluminum nickel iron powder iron barium powder as filler
10 improve the water resistance, using lead oxide or resin curing system with low water absorption, clay filler such as barium sulfate.
11 to improve the resistance to oil - fully crosslinked, less use of plasticizer
12 improve the acidproof alkalinity -- multi filler
13 to improve the high vacuum -- with additive of volatile small
14 reducing the hardness - filling large amount of softener.
The relevant question eight, rubber vulcanization
Which kinds of toxic gases 1 rubber vulcanization of rubber vulcanization process? Used in oven semi closed curing some rubber have poisonous gas trace discharge can smell a heavy rubber smell. For example, a sulfur dioxide, sulfur dioxide, sulfur dioxide, hydrogen sulfide gas is toxic three things basically no but certainly harmful to some products on the human body will produce carcinogenic sulfide things or itself before vulcanization rubber have carcinogenic ingredients less contact with the best as well. Organic reagent of rubber vulcanization adopted more or less on the human body are harmful. As of two methyl benzene etc.
2 general rubber vulcanizing temperature depends how much is generally 115 to 180 degrees to see what variety of rubber. While the temperature of 200 degrees for high temperature vulcanization.
What are the hazards of 3 sulfur dioxide? Risk categories - three-star pathways through the respiratory system, health hazards are easily mucosal surface wet absorption sulfurous acid, sulfuric acid. A strong stimulus to eyes and respiratory tract mucosa. A large number of inhalation may cause pulmonary edema, edema of the larynx, the vocal cords spasm due to asphyxia. Tears, photophobia, cough, pharynx, larynx pain severe poisoning can be within a few hours of pulmonary edema occurs very high concentrations of inhaled can cause reflex glottic spasm caused by asphyxia of acute poisoning of mild poisoning. Skin or eye contact inflammation or burn. Chronic effects of long-term exposure to low concentration
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