Rubber Basics Introduction
Release time：2015/4/12 15:48:20
? Popular definitions:
? rubber is a highly elastic polymer compounds (molecular weight of 10 million or more in general), so they have no other materials are highly elastic. Thus, also known as elastomers.
? Rubber origins:
? by native tropical American tree crying tears dried emulsion solidified.
? Development:
? curing method of the invention.
Classification of rubber
? Natural rubber and synthetic rubber.
? a: natural rubber
? As the name suggests, is made from natural or planted rubber trees after tapping, filter cleaning. Drying processes processing.
II: synthetic rubber
? The pyrolysis oil were then chemically synthesized
? synthetic rubber Category:
? A generic class: that meet the general requirements of the rubber.
? B special synthetic class: to meet the special requirements of the rubber.
General synthetic rubber used include:
? 1 SBR:. (SBR)
? butadiene \ styrene earliest synthesized rubber elastic somewhat less than NR, wear and aging better than NR, mainly used for shoe soles and tires.
? 2. Isoamyl rubber (IR)
? isoprene because NR same structure, it is also known as artificial NR. NR similar nature.
? 3. Butadiene rubber (BR)
? butadiene its elasticity and low temperature resistance is the best general-purpose rubber for tires, jumping ball.
Special synthetic rubber
? 1 EPDM rubber (EPDM)
? Ethylene \ acrylic \ third monomer. Excellent overall performance, and versatile.
? 2 silicone (SR or Q)
? Use the widest temperature range, -120 --- + 250 ℃, the lowest toxicity.
? 3-fluoro-rubber (FKM or FPM)
? Fire. Oil. Solvent glue all the best.
? 4 Polyurethane (PU): the best wear resistance.
? 5 Other: PS ACM ECO CPE CSM, etc ....
? toxic rubber material
? Scientific proof:
? Most of the rubber material is toxic or non-toxic. Its toxicity is also smaller than the salt. As long as good protective measures, the body will not cause much harm.
Knowledge rubber compound of formula
? recipe structure:
? raw rubber: also called gum, not add other ingredients.
? Curing agent: The rubber molecule linking and shaping of substances such as sulfur, peroxide and the like.
? accelerators: Accelerated curing agent decomposition and promote vulcanization molding and other substances such as TT CZ.
? agent: accelerant accelerate decomposition of materials such as rubber activation ZNO SA, etc ....
? reinforcing agents: increased green strength of the material, such as carbon black, white carbon and the like.
Recipe Examples
? NBR7001 (unit: shares)
? N3350 raw rubber 100
? Zinc oxide 5
? stearate 1
? Antioxidant RD 1
? DR Dispersant 1
? N774 carbon black 75
? White carbon black 15
? Calcium carbonate 40
? DOP 12
? Sulfur 1.5
? accelerator TT 0.5
? accelerator CZ 1.5
? SR wire casing recipe
? methyl vinyl silicone rubber 100
? 2 # fumed carbon black 30
? Two-February 1
? diphenylsilandiol 5
? Plasticizers: Also called softeners, reducing rubber hardness of most of oils, such as DOP, paraffin oil and so on.
? Antioxidant: reinforced rubber material to resist damage of light, heat, oxygen, ozone, ultraviolet rays, such as 4010-NA, RD, and so on.
? Other:
? such as dispersants, release agents, fragrances, foaming agents, tackifiers and the like.
The plastic material used for the curing temperature
? rubber
? NR. IR
? SBR. BR. PU
? NBR.CR.FKM
? EPDM. IIR
? SR
? curing temperature (℃)
? 40 ----- 160
? 150 ----- 170
? 160 ----- 180
? 170 ----- 185
? 160 ----- 190
Lack of material solutions
? 1. An additional exhaust ducts.
? 2. Multi-exhaust.
? 3. increase the pressure.
? 4. change the recipe, to increase fluidity of rubber.
? 5. change the formula to extend the scorch time, to prevent numbness.
? 6. increased material thickness.
Common defects and corrective measures
? lack of material:
? Cause:
? The air between a rubber mold and can not be discharged.
? 2 weigh enough.
? 3 pressure is insufficient.
? 4 rubber illiquid.
? 5 mold temperature is too high, rubber scorch.
? 6 rubber early scorch (dead material).
? 7 material is not thick enough, the flow is not sufficient.
Blooming white:
? Cause:
? 1. cure deficiencies.
? 2. with an excess of agents, more than rubber solubility.
? Solution:
? 1. When prolonged or take secondary sulfide sulfur.
? 2. Adjustment formula, reducing the amount of low-solubility complexing agent.
Bubbles. Hair hole
? Cause:
? 1. Insufficient vulcanization.
? 2. Insufficient pressure.
? 3. The mold or rubber compound impurities or oil.
? 4. Vulcanizing mold temperature is too high.
? 5. Curatives plus less, curing speed is too slow.
Bubbles. Remedy hair hole
? 1. Pressurization
When ? 2. Lengthen sulfur
? 3. Adjustment formula to accelerate curing speed.
? 4. More exhaust.
? 5. Mold temperature is not too high.
? 6. Increase the amount of curing agent.
Heavy leather cracking.
? Cause:
? 1. Curing too fast, plastic flow is not sufficient.
? 2. Mold dirty or sticky gum stains.
? 3. Dusting agent or release agent too.
? 4. Plastic material thickness is not enough.
Heavy leather. Cracking solutions
? 1. Lower mold temperature, slow cure speed.
? 2. Keep rubber mold clean.
? 3. Less with a release agent or release agent.
? 4. Plastic material thick enough.
Product ejection fracture
? Cause:
? 1. Mold temperature is too high or too long when sulfur.
? 2. Excessive amount of curing agent.
? 3. Stripping the right way.
Product ejection fracture
? Solution:
? 1. lower mold temperature.
? 2. When shortening sulfur.
? 3. reduce the amount of curing agent.
? 4. Spray release agent.
? 5. take proper stripping methods.
Difficult to process
? Cause:
? 1. Product good tear strength, (such as high tensile plastic). This performance is difficult to process burr tear down.
? 2. Product strength bad, the performance is very crisp edges, the product will even tear together.
Difficult to process
? Solution:
? 1. If you can not afford a tear, you have to adjust the formula, and more filled with the agent, reduce shrinkage.
? 2. If it is torn, then
? a lower mold temperature, shorten sulfur.
? b reduce the amount of curing agent.
? c adjustment formula, increase strength plastic material
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