0 ITEM
Commonly used plastic process characteristics (45 kinds)(一)
ABS (acrylonitrile - butadiene-styrene copolymer)
1. Belonging to ethylene, it is common material and easy to form.
2. Good fluidity, chemical plating tightness and heat resistance.
3. Forming character can be stable.
4. The surface appearance of the gate part and easy to form obvious fusion line.
5. Milky white, translucent.
6. Better impact resistance than PS.
7. The ABS, mechanical strength and heat resistance of various properties can be obtained by the change of the composition proportion of each polymer. It is excellent in the general plastic, and the surface luster, surface spraying and electroplating are good, and the background color is yellow.
AS(SAN) (acrylic-styrene copolymer)
1. Belonging to ethylene, it is common material and easy to form.
2. Good fluidity, good formability, good formability.
3. Easy to crack the bowl.
4. Waste edge is easy to occur.
BT (BT resin)
1. Good heat resistance and surface adhesion.
2. It can meet the requirements of high-speed transmission circuit board.
3. Can prevent the phenomenon of leakage.
CA (Cellulose acetate)
1. Good fluidity and formability.
2. The surface is smooth and beautiful, with good dimensional accuracy and easy coloring.
3. Good transparency, flexibility and processability.
CE (Cyanate resin)
1. The dielectric constant of pure cyanate is 2.8.
2. Different reinforcing fibers can be used to make substrate with different medium constants. When reinforcing with quartz fiber, the medium constant value can be as low as 3.1.
EP (Epoxy resin [cold gel])
1. Metal adhesion, good drug resistance.
2. Good mechanical strength and insulation.
3. Traditional epoxy resins, known as difunctional epoxy resins, will continue to burn after ignition until the carbon, hydrogen and oxygen in the polymer are completely burned.
ETFE (ethylene-tetrafluoroethylene copolymer)
1. It is a kind of fluorin resin for thermal plasticity.
2. Good electrical properties: excellent insulation material, with very low dielectric constant.
3. Good heat resistance.
4. Flame resistance: Oxygen Index 95%, UL94, V-0, is a stable substance with flame resistance, which can be used for different purposes.
5. Excellent chemical resistance: almost no reaction to all chemicals.
6. High mechanical strength.
7. Low friction, low non-viscosity.
8. Excellent weather resistance: direct exposure to sunlight, rain or waste gas without loss or deformation, long exposure to outdoor characteristics and no change.
9. Drug resistance.
10. The vibration can be increased when GF and CF are added.
11. Large shrinkage.
Fr-pet (Enhanced polydiethyl terephthalate)
1. Excellent electrical characteristics, good weather resistance, excellent mechanical properties, small Creep.
2. Good heat resistance.
3. Fast crystallization speed, excellent molding, good fluidity.
4. Low water absorption, good size stability.
5. The surface luster is good and the coloring is good.
6. Resistance to organic solvents, oil, weak acid.
7. Heat resistance is better than FR-PBT.
MF (melamine methylsilicone resin [melamine methylsilicone scientific porcelain, melamine melamine plate])
1. Same as UF, only water resistant surface has high hardness.
2. Flame resistance, colorless, easy to color.
M-ppe (modified polyoxyxylene resin)
1. Good processing stability.
2. Excellent mechanical properties.
3. Good heat resistance and water resistance.
4. With self-extinguishing.
5. Excellent electrical characteristics.
6. Small forming shrinkage.
7. Poor chemical resistance.
LCP TYPE I (Liquid crystal Polymer)
1. Highest heat resistance.
2. Good drug resistance, size stability and lubrication.
3. Deterioration will occur in bending strength and high concentration alkali vapor.
4. Different side, high temperature molding, high price.
LCP II (Liquid Crystal Polymer)
1. Good drug resistance, high fluidity, vibration absorption characteristics and mechanical strength.
2. Small coefficient of longitudinal expansion.
3. Poor bending strength and large variance.
4. Strength is affected by thickness.
5. Unfilled grade is easy to produce surface peeling phenomenon.
LCP III (Liquid Crystal Polymer)
1. Good drug resistance, high fluidity, vibration absorption and formability.
2. Poor bending strength and large variance.
PA (polyamide)
1. The solution has low viscosity and good fluidity.
2. Poor safety of shrinkage rate, easy to form waste edge.
3. The hardness is high beyond the melting temperature, which may damage the mold and screw.
4. Its viscosity is highly sensitive to heating temperature, and it is also a plastic with large hygroscopicity.
5. Good liquidity at high temperature, it is not easy to melt, and easy to cool and solidify after melting.
6. Strong and tough, their lubricating but wear resistance, shock absorption, heat resistance, cold resistance, drug resistance is good.
7. Good mechanical strength, glass fiber only reinforcing effect, gas shielding, good moisture absorption.
8. Low temperature impact resistance strength is insufficient.
9. Size and physical properties change greatly after moisture absorption and dehumidification.
10. Poor size stability.
PAI (polyetherimide)
1. High mechanical strength and hardness.
2. Flame retardant, UL94VO, good weather resistance.
3. Excellent chemical resistance and heat resistance to water.
4. Excellent electrical characteristics, easy molding and processing, good dimensional stability.
5. Excellent heat resistance and creep resistance.
6. The elastic coefficient changes little below 260℃.
7. Poor formability, fluidity, alkali resistance and moisture absorption.
8. High prices.
PAR (polyaromatic esters)
1. Good mechanical properties, colorless and transparent (not filled).
2. Temperature resistance, HDT are above 150℃, low temperature impact resistance.
3. Not easy to burn, oxygen index 36.8, UL94VO.
4. Good weather resistance, uv resistance and electrical characteristics.
5. High impact strength and low thickness dependence.
6. High temperature creep is good.
7. Solvent resistance, acid and alkali resistance and poor fluidity.
PBT (polyethylene terephthalate)
1. Good molding, weather resistance, heat resistance, heat aging, electric resistance, fatigue resistance, wear resistance, heat resistance, water resistance and drug resistance.
2 and PET are saturated polyester, high melting degree, rapid crystallization, fast curing speed.
3. Poor impact strength.
PC (Polycarbonate)
1 melt high viscosity, must use high pressure, high temperature forming.
2. Residual stress is prone to fracture.
3. Due to high hardness, it is easy to damage the mold.
4. There is waste extrusion.
5. Transparent, strong, low temperature stability.
6. Good weather resistance, optical rotation resistance, impact resistance, heat resistance, Creep resistance.
7. Good mechanical properties at high and low temperatures.
PCTFE (polytrifluoroethylene chloride)
1 melt viscosity is very high, must be high pressure forming.
2. Discoloration is easy to occur.
PDAP or DAP (polydiallyl phthalate)
1. Good strength, insulation, drug resistance and heat resistance.
2. Good size stability, good wear resistance when wet.
3. Low pressure forming.
PE (polyethylene)
1. Large shrinkage, easy to bend and deformation.
2 need cooling time, forming energy rate is not good.
3. Forming products have depression, need to force demoulding.
4. Forming shrinkage rate is greatly affected by mold temperature, and the stability is poor.
5. Good liquidity, good thermal stability, but the molecular coordination is strong and easy to deformation.
6. Lighter and softer than water.
7. Heat resistance, and then poor printing.
8. Good drug resistance, water resistance and electrical insulation.
PEEK (poly (ether ether ketone))
1. Good temperature resistance, thermal stability, ultra-high heat resistance (PPS excellent), HDT above 315℃, UL continuous use temperature of 250℃.
2. High mechanical strength, such as impact resistance, wear resistance, creep resistance and fatigue resistance.
3. Drug resistance (except concentrated sulfuric acid), the best heat resistance (PPS, PES above).
4. Good γ -ray resistance, flame resistance and extrusion processing.
5. Excellent electrical characteristics under high temperature and humidity.
6. Minimum smoke emission, radiation resistance.
7. High price, high temperature molding, poor liquidity.
8. Good toughness, strength and rigidity.
9. Good fire resistance, no need to add fire resistance agent.
10. Poor processing.
PEI (polyamideimide)
1. Used for injection molding, the highest tensile strength.
2. The best potential resistance (normal temperature ~150℃).
3. Non-flammable, UL94VO, OXYGEN consumption index 42.
4. Wear resistance, temperature resistance, oil resistance, chemical resistance are better.
5. Good fire resistance and weather resistance, less smoke, good transparency (not filled).
6. The elastic coefficient changes little below 150℃.
7. High temperature molding, poor fluidity, alkali resistance and moisture absorption.
PES/PESF (Polyether)
1. -100~170℃, excellent mechanical strength, temperature resistance.
2. Good size stability and transparency (not filled).
3. Resistant to high temperature steam and hot water and acid and alkali.
4. High oxygen consumption index (UL94V0), difficult to ignite.
5. Excellent electrical characteristics.
6. Smoke less.
7. Superior high temperature creep.
8. Below 180℃, the elastic coefficient changes little.
9. Poor solvent resistance and weather resistance, high temperature molding.
PF (Bakelite resin)
1. Good mechanical strength, insulation, combustion resistance, water resistance, acid resistance, oil resistance and stability.
2. Dark color is not alkali resistant, easy to change color and limited dyeing.
