Classification of conventional injection materials for injection molding machines

For Dongguan injection molding machine plastic materials can be divided into thermosetting and thermoplastic two kinds:

1, thermosetting plastic: refers to the plastic can not be reused, its molecules eventually into the body structure.

2, thermoplastic plastic: refers to the plastic can be reused, divided into crystal (PBT,PA) and amorphous (PC,PPO). Crystalline plastics are plastics whose liquid can become regular when it becomes solid, and whose molecules are mostly arranged in linear or branched chains.

3, engineering plastic engineering plastic refers to the use in mechanical components, can be used for a long time at more than 100 degrees Celsius, tensile strength in a square centimeter of more than 500kg; Plastic with flexural strength of over 2400kg per square centimeter.

At present, most of the plastics used are: PP, ABS, PBT, PC, PA, PPS, POM and so on.

1, ABS material :(acrylonitrile. Styrene butadiene. Three yuan resin). (acrylonitrile - butadiene - styrene copolymer) at present most of the use of labels are: China petrochemical chemical fiber basf, Taiwan's chi mei, Taiwan, South Korea's LG chemical (ningbo LG), Han Guojin lake, South Korea's samsung characteristics: impact resistance performance is good, high strength and rigidity, good low temperature resistance, heat resistance, high gloss, color matching and secondary processing and surface treatment.

2. PP material: (polypropylene) Currently, most brands used are:

China Petrochemical Taiwan Chemical Fiber Zhenhai Refining Korea Hyundai Singapore Mytex India Seetec

Characteristics: light specific gravity, good fluidity, colorless, tasteless, odorless, non-toxic, gloss, tensile strength, good heat resistance, good secondary processing performance, good insulation, chemical stability; With low price, it is mainly suitable for woven bags, toys, turnover boxes, home appliances, pipes, boards and so on.

The company's products are mainly used in electrical shell, such as: motor back cover three tube front and rear shell small solar back cover wind blade and so on;

General forming conditions:

1, mold temperature: 20 degrees to 40 degrees;

2, dry conditions: 80 degrees for 1-2 hours or more;

3, material tube temperature: 170 degrees to 220 degrees;

4, thermal deformation temperature: 80 degrees (1.8MPa,12.7mm);

5, softening point: more than 135 degrees;

6, mold shrinkage rate: 0.5%--0.7%(3.3mm)

7. Tensile yield strength: 20-30MPa.

The commonly used modification methods are: enhancement, toughening, flame retardant, oxidation resistance, weather resistance and high gloss.