[Topic 9] Rubber Industries

Question 1

Types of Rubber (2)

Answer 1

1. Natural Rubber
2. Synthetic Rubber

Question 2

Is a natural occurring polymer synthesized from “rubber trees” in the form of latex.

Answer 2

Natural Rubber

Question 3

Rubber that is synthesized from byproducts of petroleum.

Answer 3

Synthetic rubber

Question 4

Tree that produces latex

Answer 4

Hevea brasiliensis

Question 5

Tree that produces balata

Answer 5

Manilkara bidentata

Question 6

Tree that produces chicle

Answer 6

Manilkara chicle

Question 7

Widely used synthetic rubber

Answer 7

Styrene-butadiene rubber (SBR)

Question 8

Classification of rubbers according to class (4)

Answer 8

1. Elastomers (Class I)
2. Hard Plastics (Class II)
3. Reinforcing Resins (Class III)
4. Paint Vehicles (Class IV)

Question 9

Types of Elastomers (2)

Answer 9

1. Vulcanizable
2. Nonvulcanizable and other elastomers

Question 10

Types of vulcanizable rubbers (2)

Answer 10

1. Diene rubbers
2. Nondiene rubbers

Question 11

Classification of rubbers according to chemical composition (coded)

Answer 11

1. M rubbers
2. N rubbers
3. O rubbers
4. R rubbers
5. Q rubbers
6. T rubbers
7. U rubbers
8. Z rubbers

Question 12

having a saturated chain of the polymethylene type

Answer 12

M rubbers

Question 13

Having nitrogen in the polymer chain but not oxygen or phosphorous

Answer 13

N rubbers

Question 14

Having oxygen in the polymer chain

Answer 14

O rubbers

Question 15

Having an unsaturated carbon chain

Answer 15

R rubbers

Question 16

Having silicone and oxygen in the polymer chain

Answer 16

Q rubbers

Question 17

Having sulfur in the polymer chain

Answer 17

T rubbers

Question 18

Having carbon, oxygen, and nitrogen in the polymer chain

Answer 18

U rubbers

Question 19

Having phosphorous and nitrogen in the polymer chain

Answer 19

Z rubbers

Question 20

A symbol for rubber in making acronyms for rubber names

Answer 20

R

Question 21

Generally process via emulsion polymerization

Answer 21

Copolymers

Question 22

What is SBR?

Answer 22

Styrene-Butadiene Rubber

Question 23

What is NBR?

Answer 23

Nitrile-Butadiene Rubbers

Question 24

Also known as polychloroprene, is one of the first synthetic rubber products ever made.

Answer 24

Neoprene

Question 25

Other rubber products in the industry (7) aside from SBR

Answer 25

1. NBR 2. Neoprene 3. Thiokol 4. Silicone Rubber 5. Butyl Rubber 6. Urethane Rubber 7. Hypalon

Question 26

Is spandex a brand or a product?

Answer 26

Product

Question 27

Advantages of synthetic natural fiber (7)

Answer 27

1. Better color 2. Uniform in quality 3. Lower odor 4. faster processing breakdown and mixing 5. Better extrusion and calendering 6. Excellent mold flow 7. Controlled molecular weight

Question 28

Production process for rubber making

Answer 28

Natsyn Process

Question 29

This catalyst is used in Natsyn Process in rubber making.

Answer 29

Ziegler-Natta (Alkyl Lithium)

Question 30

It means termination of polymer chain using chain termination agents.

Answer 30

Short Stop

Question 31

Used as roofing materials where they are replacing hot asphalt and used in wire and cable insulation.

Answer 31

Ethylene-Propylene Polymers and Tetrapolymers

Question 32

It is the process of cross-linking rubber molecules chemically with organic/inorganic substances through the action of heat and pressure using vulcanizing agents.

Answer 32

Vulcanizing (Bulkit)

Question 33

Temperature required for vulcanizing

Answer 33

140-200 deg Cel

Question 34

Temperature required for vulcanizing of latex dipped goods.

Answer 34

60-120 deg Cel with no pressure

Question 35

Any numerous chemical additives that encourage the suspension of one liquid in another.

Answer 35

Emulsifier

Question 36

A solution that lessens the impact on pH from the addition of acid or base.

Answer 36

Buffers

Question 37

Chemicals that are added to improve the properties of the product.

Answer 37

Modifiers

Question 38

The watery part of the rubber mixture.

Answer 38

Serum

Question 39

A class of rubber chemical which are added to a compound to increase the speed of vulcanization.

Answer 39

Accelerators

Question 40

Substances other than the catalyst that facilitate the start of a catalytic reaction.

Answer 40

Activators

Question 41

Substances added to slow down the rate of chemical reaction.

Answer 41

Retarders

Question 42

Substances that interrupts free-radicals chain reactions and thus prevent further degradation.

Answer 42

Antioxidants

Question 43

Substances that is added to protect against damage from ozone.

Answer 43

Antiozonates

Question 44

Substances added to the polymer to improve the properties and reduce cost of production.

Answer 44

Fillers

Question 45

Substances that makes the product flow with ease.

Answer 45

Softeners and extenders

Question 46

Substances capable of producing a cellular structure via foaming process in a variety of materials that undergo hardening or phase transition.

Answer 46

Blowing Agents

Question 47

Substances that promote plasticity and flexibility.

Answer 47

Chemical Plasticizers

Question 48

It serve as either oxidation catalysts or radical acceptors, which essentially remove free radicals formed during the initial mixing of the elastomer.

Answer 48

Peptizers

Question 49

Extruder used to remove water from a material or product, often before further processing. This process might not involve heat and relies on mechanical pressure.

Answer 49

Extruder Dewatering

Question 50

Usually involves heat to remove moisture from the product after it has been extruded. It's a subsequent step where the extruded product is sent into a low-temperature dryer to remove moisture.

Answer 50

Extruder Drying

Question 51

Tire Manufacturing Steps (6)

Answer 51

1. Mixing 2. Extrusion 3. Calendering 4. Tire Building 5. Curing 6. Measuring and Testing

Question 52

Natural and synthetic rubbers are mixed with many other chemicals to create a compound that serves a particular purpose within the tire.

Answer 52

Mixing

Question 53

Rubber is pushed through a die to create shapes made of one or more different compounds in different locations to be used in the tire.

Answer 53

Extrusion

Question 54

It is pressed into a rubber sheet or impregnated into fabric or steel to create a rubber-coated reinforced sheet to be cut into components for the tire.

Answer 54

Calendering

Question 55

Takes all the components listed on the specification to create the uncured (green) tire.

Answer 55

Tire Building

Question 56

True or False: The tire is assembled from the inside out by wrapping the components around a drum and forcing them together using internal air pressure and rollers pressing from the outside to consolidate the components together.

Answer 56

True

Question 57

The uncured or green tire is placed into a mold which is mounted into a press.

Answer 57

Curing

Question 58

True or False: Once the tire is loaded into the press, a bladder inflates into the tire at high pressure to hold the tire in place as the mold closes around the tire.

Answer 58

False: low pressure

Question 59

True or False: In curing, once closed, low pressure steam or gas fills the bladder forcing the tire into the mold to take the final shape of the tire.

Answer 59

False: high pressure

Question 60

The cured tire goes to a machine where it is inflated and ran against a wheel at a certain load and inflation pressure.

Answer 60

Measuring and Testing

Question 61

This measures variation in forces that would be exerted against the road.

Answer 61

Measuring and Testing

Question 62

A machine used to balance the tire.

Answer 62

Balance Machine

Question 63

Who discovered vulcanization?

Answer 63

Charles Goodyear

Question 64

Rubber was named by him.

Answer 64

Joseph Priestly