Is injection molding pc material corrosive or toxic (familiar with the pc material injection molding process but not able to inject soft pvc)

Today, I will share with you the knowledge of whether injection molding pc material is corrosive or toxic. I will also explain how familiar with the pc injection molding process but not know how to soft pvc injection molding. If you can happen to solve the problems you are facing now, don't forget to pay attention to this site, let's start now!

List of contents for this article:

• 1、PC injection molding knowledge
• 2、What are the solutions for the PC material melting index to become high after injection molding
• 3、Is PC material used for injection molding harmful to the human body?
• 4、What are the characteristics of plastic raw materials

PC injection molding knowledge

1. PC has average forming properties and is suitable for injection, extrusion, molding, thermoforming, printing, gold cutting and bonding. Injection molding: PC amorphous plastic has good thermal stability and a wide molding temperature range. It will decompose severely when it exceeds 300℃. It is non-toxic and non-corrosive when decomposed. Strong water sensitivity and easy to hydrolyze at high temperatures. The water content during forming is controlled below 0.02%, otherwise silver threads, bubbles and hydrolysis are prone to occur.

2. Basic process of PC plastic injection molding process Raw material preparation The injection molding process of PC plastic must first prepare suitable raw materials. PC plastic usually exists in the form of granules or powders, so it needs to be heated and melted into a liquid state during the injection molding process. Injection molding machine operation Injection molding machines are key equipment for PC plastic injection molding.

3. Glasses are made of various materials, and different materials have different characteristics. The following are some common knowledge introductions of common eyeglass materials: Plastic frame injection molding material TR Material characteristics: Excellent flexibility, known as "memory plastic", high transparency, The texture is very light and resistant to extrusion and trampling (easily broken when added with recycled materials). Advantages: Good flexibility and can accommodate different size requirements.

What are the solutions for the PC material melting index to become high after injection molding

Optimization of raw material pretreatment (1) Strictly control the quality of raw materials and additives. PC is a highly hygroscopic resin and must be dried to a moisture content of ≤0.02% before injection molding. It is recommended to use a blast dryer. The drying temperature is set to 110~120℃. The drying time is 3~4 hours; to avoid excessive drying causing adhesion of material particles, or insufficient drying causing high-temperature hydrolysis and degradation. After stopping for more than 8 hours, the remaining raw materials in the hopper need to be emptied.

Solid phase condensation chain repair This solution is the mainstream method of industrial batch repair. It is suitable for highly degradable recycled materials whose melting index is more than 50% higher than that of new PC: (1) Pretreatment requires that the PC recycled materials be broken into 5 - 10mm particles, dry on hot air at 120 ° C for 4 - 6 hours to make the water content of the material ≤0.02%, avoiding hydrolysis and degradation. Clean up residual impurities inside the equipment to prevent contamination of repair materials.

The core reason for the excessive rise in the melting index of PC products after injection molding is that the PC resin undergoes thermal degradation and shear degradation during the injection molding process. Targeted rectification needs to be made from three dimensions: raw material control, process parameters, and equipment molds, and the increase in the melting index is controlled to Within 10% of the initial melting index is the industry's general qualification range.

The added proportion of recycled material shall not exceed 10%, and the melting index of recycled material needs to be tested in advance to ensure that the difference between the recycled material and the new material is ≤2g/10 min. Optimization of injection molding process parameters (1) Strictly control the processing temperature. The effective processing temperature window of PC is narrow (240-300℃). Thermal degradation will occur quickly if it exceeds 310℃. The temperature of each barrel is set as low as before: 240-260℃ in the feeding section, 260-280℃ in the plasticizing section, and 270-290℃ in the homogenization section.

The yellowing of plastic PC during injection molding has little to do with the screws of the machine. The yellowing of plastic PC during injection molding is mainly caused by high temperature degradation. One solution is to reduce the injection molding temperature.

Common flaws and solutions in plastic IC trays Causes of crazing: Anisotropic effects of internal stress during mold filling and condensation. Stress in the vertical direction causes the resin to flow and orient, and different refractive index from non-flow orientation causes flash silk. After expansion, it may cause cracks in the IC tray. Solution: Pay attention to adjustment in the injection molding process and mold, and anneal the IC tray. For example, heat the PC material to above 160 ° C for 3 - 5 minutes before naturally cooling.

Is PC material used for injection molding harmful to the human body?

1. Injection molding of ordinary plastic raw materials like PC material does not have much odor or toxicity, otherwise the world would have long stopped production. However, some special plastic raw materials need attention. For example, POM materials are easy to crack and produce pungent gas gas. Therefore, the heating time and temperature must be strictly controlled, otherwise it will easily cause explosion. When PVC material is heated, it decomposes to produce halogen gas, which is toxic.

2. Hello, PC board is made of polycarbonate as the main raw material for production. We use co-extrusion technology to process polycarbonate resin and some auxiliary materials and other raw materials to produce PC board. It is a highly comprehensive plastic board that contains high technological content, is rich in energy conservation and environmental protection. It is often used by people in my country's construction industry. No harm. Hope to accept it, thank you.

3. There are many kinds of plastics, including polyethylene, polyvinyl chloride, polypropylene, etc., depending on what kind of plastic you produce.

4. Working as an injection molding worker is harmful to your body. Injection molding work will encounter some chemical substances, such as lead, mercury, manganese, benzene, carbon monoxide, trinitrotoluene, arsenic, phosphorus, etc. Long-term exposure can cause headache, dizziness, fatigue, sleep disorders, and neurasthenia symptoms such as loss of appetite can invade hematopoietic organs, nervous system, etc. and affect health.

What are the characteristics of plastic raw materials

1. The characteristics of plastics are: 1 Most plastics are light, chemically stable, and will not rust; 2 They have good impact resistance; 3 They have good transparency and wear resistance; 4 They have good insulation and low thermal conductivity; 5 They have general moldability. Good coloring, low processing costs; 6 Most plastics have poor heat resistance, large thermal expansion rates, and are easy.

2. Plastic raw materials have the following characteristics: light weight and stable chemical properties: Most plastics are light in weight, have good chemical stability, and are not easy to rust. Good impact resistance: Plastic raw materials can withstand a certain impact force and are not easy to damage. Good transparency and wear resistance: Some plastics have good transparency and strong wear resistance, so they are suitable for making products that require transparency and wear resistance.

3. Plastic raw materials have the following characteristics: Light weight: Compared with traditional materials such as steel and wood, plastic is lighter in weight, has lower density, and is convenient for transportation and processing. Chemical stability: Plastic raw materials have stable chemical properties and are not easy to rust or corrode, and can maintain stable performance in a variety of environments. Good impact resistance: Plastic raw materials have good impact resistance and can withstand certain external impact without being easily damaged.

4. The characteristics of plastic raw materials mainly include the following points: light weight and chemically stable: Most plastics have light mass, stable chemical properties and are not easy to rust. Good impact resistance: Plastic raw materials can withstand a certain impact and are not easy to rupture. Good transparency and wear resistance: Some plastic raw materials have good transparency and strong wear resistance.

5. Plastic raw materials mainly include the following: Polyethylene: Introduction: Polyethylene is the simplest polymer and one of the most widely used polymer materials. Characteristics: Good chemical stability, electrical insulation and water resistance. Polypropylene: Introduction: Polypropylene is a semi-crystalline thermoplastic. Characteristics: It has high impact resistance, strong mechanical properties, resistance to various organic solvents and acid and alkali corrosion, and is widely used in the industrial world.

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