PC TF 7320R

Modified plastics can replace SABIC PC 3412R, Covestro 80259125 for outdoor applications, brominated flame retardant grade for electrical enclosures, and 20% glass fiber reinforced grade. Specially applied to scenarios requiring high rigidity and high heat resistance. Applied to outdoor products, furniture accessories, lighting equipment, laptops, appliances, power tools and other products, it has good cost-effectiveness.

Replacing LEXAN 3412R-SABIC with SABIC Innovative Plastic PC

Processing grade Injection grade Melt flow rate 11g/10min

Density 1.29, tensile strength 450kg/cm2

Bending strength 781kg/cm2, bending modulus 1900kg/cm2

Notch impact strength 77kg.cm/cm Brittle temperature 120 ℃

Vicat softening point 215 ° F

Introduction:

Polycarbonate (PC) is a polymer with carbonate ester groups in its molecular chain. It can be classified into various types based on the structure of the ester groups, such as aliphatic, aromatic, and aliphatic aromatic. Due to the low mechanical properties of aliphatic and aliphatic aromatic polycarbonate, their application in engineering plastics is limited. Currently, only aromatic polycarbonate has achieved industrial production. Due to the unique structure of polycarbonate, it has become the fastest-growing general-purpose engineering plastic among the five major engineering plastics.

PC is a linear carbonate polyester, in which the carbonate groups are alternately arranged with other groups in the molecule. These groups can be aromatic, aliphatic, or both. Bisphenol A-type PC is an important industrial product.

PC is an almost colorless glassy amorphous polymer with excellent optical properties. PC high molecular weight resin has high toughness, with a cantilever beam notch impact strength of 600-900j/m. The unfilled grade has a thermal deformation temperature of approximately 130 ° C. Glass fiber reinforcement can increase this value by 10 ° C. The bending modulus of PC can reach over 2400MPa, and resin can be processed into large rigid products. When the temperature is below 100 ° C, the creep rate under load is very low. PC has poor hydrolysis resistance and cannot be used for products that are repeatedly subjected to high-pressure steam.

The main performance defects of PC are insufficient hydrolysis stability, sensitivity to notches, poor chemical and scratch resistance, and yellowing when exposed to ultraviolet light for a long time. Like other resins, PC is prone to being soaked by certain solvents.

PC materials have flame retardancy and wear resistance. Oxidation resistance.

Categories: anti-static PC, conductive PC, fiber-reinforced fireproof PC, UV resistant and weather resistant PC, food grade PC, chemical resistant PC.

Main advantages:

1. Has high strength and elasticity coefficient, high impact strength, and a wide range of operating temperatures;

2. High transparency and free staining;

3. Low forming shrinkage rate and good dimensional stability;

4. Good fatigue resistance;

5. Good weather resistance;

6. Excellent electrical characteristics;

7. Odorless and odorless, it is harmless to the human body and meets hygiene requirements.

Main performance:

a. Mechanical properties: high strength, fatigue resistance, dimensional stability, and minimal creep (with very little variation under high temperature conditions);

b. Heat aging resistance: The enhanced UL temperature index reaches 120-140 ℃ (also has good long-term outdoor aging resistance);

c. Solvent resistance: no stress cracking;

d. Water stability: prone to decomposition when exposed to water at high temperatures (caution should be exercised when using in high temperature and high humidity environments);

e. Electrical performance:

1. Insulation performance: Excellent (able to maintain stable electrical performance even in damp and high temperatures, making it an ideal material for manufacturing electronic and electrical components);

2. Dielectric constant: 3.0-3.2;

3. Arc resistance: 120s;

f. Molding processability: ordinary equipment injection molding or extrusion molding.

Performance and molding parameters of polycarbonate:

1、 Drying of raw materials

1. Raw material drying: The temperature of the ordinary drying oven is 110-130, and the time is 2-4 hours. The temperature of the top hopper drying oven is 100-120, and the moisture content is required to be below 0.03%.

2. Judging whether the water content is qualified: Look at the situation of the injected material strip, and the material strip flowing out from the nozzle after plasticization should be a uniform, colorless, silver free, and bubble free fine strip; Otherwise, it is incomplete drying.

2、 Injection process

1. Adjust the molding parameters of the injection molding machine (depending on the molecular weight of the raw materials):

Barrel temperature: front 250-310, middle 240-280, rear 230-250.

Nozzle temperature: 10 degrees lower than the rear.

Mold temperature: 70-120.

Injection pressure: 70-140mpa.

Screw speed: 30-120r/min.

Molding cycle: injection 1-25s, cooling 5-40s.

3、 Precautions

1. The injection temperature is adjusted accordingly based on the molecular weight of the raw materials, the shape and size of the product, and the type of injection molding machine.

2. It is recommended to use multi-stage injection with a slow fast slow method for injection speed.

3. The injection pressure depends on the shape and size of the product, with plunger injection molding machines generally ranging from 100-160 MPa and screw injection molding machines ranging from 70-140 MPa.

4. The molding cycle depends on the thickness of the product wall and the injection volume. Generally, the filling time is short, the holding time is long, and the cooling time is based on the principle of not causing deformation of the product during demolding.

5. The mold temperature depends on the shape and thickness of the product. Increasing the mold temperature appropriately is beneficial for demolding and improving product quality.

6. Post processing of products: It is necessary to perform post-processing to eliminate or reduce internal stress for products with complex shapes, metal inserts, and extremely low or high operating temperatures.

Method: After placing the product in a drying oven, start heating it up. Raise the room temperature to 100-105 and keep it warm for 10-20 minutes. Continue heating it up to 120-125 and keep it warm for 30-40 minutes. Then slowly cool it down to below 60 and take it out.