What are the characteristics of plastic material 475(HIPS)? What are its shortcomings? I'm talking about new materials. ....

Polyoxymethylene plastic Polyoxymethylene plastic

(polyoxymethylene) (Saigang ~ Trane)

English name: polyformaldehyde

POM (Polyoxymethylene Resin) Definition: Polyoxymethylene is polymerized from formaldehyde. It is a thermoplastic engineering plastic with high density and crystallinity. It has good physical, mechanical and chemical properties, especially excellent friction resistance. It is precisely because these excellent chemical and physical properties can be comparable to steel, and the weight is lighter than steel, so it is called "Saigang"!

Specific gravity:1.41-1.43g/cm3 molding shrinkage: 1.2-3.0% molding temperature: 170-200℃ drying conditions: 80-90℃ for 2 hours.

The material has good comprehensive performance, high strength and rigidity, good wear resistance, low water absorption and good dimensional stability, but poor thermal stability, easy combustion and aging in the atmosphere. Suitable for manufacturing wear-resistant parts, transmission parts, chemicals, instruments and other parts.

The formability is 1. Crystallized materials have narrow melting range and fast melting and solidification, and crystallization occurs when the material temperature is slightly lower than the melting temperature. Medium liquidity. Low hygroscopicity, can be dried.

2. The friction coefficient is low, the elasticity is good, and the surface defects of plastic parts are prone to wrinkle patterns.

3. It is easy to decompose, and the decomposition temperature is 240 degrees. Irritant and corrosive gases will be produced during decomposition. Therefore, die steel should be made of corrosion-resistant materials.

PBT plastic

Polybutylene terephthalate (PBT) is a translucent to opaque crystalline thermoplastic polyester. It has high heat resistance, toughness, fatigue resistance, self-lubrication, low friction coefficient, low weather resistance and water absorption, and the water absorption is only 0. 1%. It still maintains various physical properties (including electrical properties) and electrical insulation in humid environment, but its volume resistance and dielectric loss are large. It is resistant to hot water, alkali, acid and oil, but it is easy to be corroded by halogenated hydrocarbons, with poor hydrolysis resistance, rapid crystallization at low temperature and good formability. Disadvantages are low notched impact strength and large molding shrinkage. Therefore, most of them are modified by glass fiber reinforcement or inorganic filling, and the tensile strength and bending strength can be more than doubled, and the thermal deformation temperature is also greatly improved. It can work at 140℃ for a long time, and the longitudinal and transverse shrinkage rates of glass fiber reinforced products are inconsistent, which is easy to warp the products.

The crystallization speed of PBT is fast, and the most suitable processing method is injection molding. Other methods include extrusion, blow molding, coating and various secondary processing and molding. Pre-drying is needed before molding, and the water content should be reduced to 0.02%.

PBT (Reinforced Modified PBT) is mainly used in automobiles, electronic appliances, industrial machinery, polymer alloys and mixed industries. For example, it can be used as distributor, car body parts, igniter coil skeleton, insulating cover, exhaust system parts, motorcycle igniter, TV deflection coil in electronic and electrical industry, CRT and potentiometer bracket, audio output transformer skeleton, adapter skeleton, switch connector, electric fan, refrigerator, motor end cover, washing machine shaft sleeve, etc.

In addition, there are transportation machinery parts, sewing machine and textile machinery parts, clock casings, lens barrels, electric iron covers, mercury lampshades, oven parts, electric tool parts, shielding sleeves and so on.

Polyphenylene ether plastic

(polyphenylene ether)

Chinese name: polyphenylene ether

Specific gravity: 1.07g/cm3 molding shrinkage: 0.3-0.8% Molding temperature: 260-290℃ Drying conditions:130℃ for 4 hours.

The material performance is 1, which is white particles. It has good comprehensive performance, can be used in steam at 120℃, has good electrical insulation and low water absorption, but has a tendency to stress crack. Modified polyphenylene ether can eliminate stress cracking.

2. Excellent electrical insulation and water resistance, and good dimensional stability. Its dielectric properties rank first among plastics.

3.MPPO is a modified material made of PPO and HIPS*** (high impact polystyrene), and all the materials on the market at present are of this kind.

4. High heat resistance, glass transition temperature of 2 1 1 degree, melting point of 268 degrees, and easy to decompose when heated to 330 degrees. The higher the PPO content, the better the heat resistance, and the thermal deformation temperature can reach 190 degrees.

5, good flame retardancy, self-interest, and moderate flammability after mixing with HIPS. Light weight, non-toxic, and can be used in food and medicine industries. Poor optical rotation resistance, long-term use in the sun will change color.

6. It can be modified with ABS, HDPE, PPS, PA, HIPS and glass fiber. 1, suitable for making heat-resistant parts, insulation parts, wear-resistant parts, transmission parts, medical and electronic parts.

2. Parts such as gears, blades and valves that can be used at higher temperatures can be replaced by stainless steel.

3, can make screws, fasteners and connectors.

4. Electrical parts of motors, rotors, housings and transformers.

Moldability 1. Amorphous substance, low hygroscopicity.

2. Poor fluidity, similar to Newtonian fluid, its viscosity is sensitive to temperature, the product thickness is generally above 0.8 mm ... It is easy to decompose, and corrosive gas is generated during decomposition. The molding temperature should be strictly controlled, the mold should be heated, and the resistance of the gating system to the material flow should be small.

3. The water absorption of polyphenylene ether is very low, about 0.06%, but a small amount of water will cause the surface of the product to be uneven, such as silver lines. It is best to dry it in the air, and the temperature should not be higher than 150 degrees, otherwise it will change color.

4. The molding temperature of polyphenylene ether is 280-330 degrees, and the molding temperature of modified polyphenylene ether is 260-285 degrees.

Abs plastics

Chemical name: acrylonitrile-butadiene-styrene polymer

English name: acrylic butadiene style

Specific gravity: 1.05g/cm3 molding shrinkage: 0.4-0.7%.

Molding temperature: 200-240℃ Drying conditions: 80-90℃ for 2 hours Working temperature: -50-70℃

Features:

1, good comprehensive performance, high impact strength, good chemical stability and electrical properties.

2. It has good weldability with 372 plexiglass, can be made into two-color plastic parts, and the surface can be chrome-plated and painted.

3, high impact resistance, high heat resistance, flame retardant, reinforced and transparent.

4. the fluidity is a little worse than HIPS, better than PMMA and PC, and the flexibility is good.

Uses: Suitable for manufacturing general mechanical parts, wear-resistant parts, transmission parts and telecommunication parts.

Molding characteristics:

1. Amorphous materials with medium fluidity and high hygroscopicity must be fully dried. Plastic parts with glossy surface should be preheated and dried at 80-90 degrees for 3 hours.

2. It is advisable to take high material temperature and high mold temperature, but it is easy to decompose when the material temperature is too high (decomposition temperature is