Q:Characteristics of rigid polyurethane foam made of polyurethane raw material

Rigid polyurethane foam in the developed countries, building hard polyurethane hard foam accounted for the total consumption of about 70%, is a refrigerator, freezers and other hard foam dosage more than doubled; in China, application of rigid foam in construction industry is still not as common in western developed countries, so the development potential is very big.

Q:What does MFI mean in PC material?

The measurement of MI is usually based on the standard method of ASTM D1238. It is the principle of the plastic or resin into the metal sleeve of a fixed inner diameter, and heating the plastic or resin after melting, and then give some load on the piston, the piston on the weight of the molten plastic has been squeezed out from a small hole in the charge, and calculate the weight and squeezed out of plastic. This measuring method, because of the same material, the sleeve barrel inner diameter, load, and temperature are fixed, so in addition to test MI, can also be used for the determination of density, viscosity, and melt shear rate, shear stress... etc.

Q:How many types of plastic materials are there?

There are many kinds of plastics. So far, there are about more than 300 kinds of plastic produced in the world. Many classification methods of plastic, there are two kinds of commonly used: 1, according to the nature of the heated plastic divided into thermoplastic and thermoset plastic molecular structure are linear structure, softening or melting when heated, plastic into certain shape, after cooling and harden. After heating to a certain extent, it softens again and hardens again after cooling. This process can be repeated many times. Such as PVC, polyethylene, polystyrene and so on. Thermoplastic molding process is relatively simple, can be continuous production, and has a high mechanical strength, so the development of very fast. The molecular structure of thermosetting plastics is the body structure, softening also occurs in heated, can plastic into a certain shape, but is heated to a certain extent or amount of curing agent, hardened stereotypes, re heating will not soften and change the shape of the. Thermosetting plastic processing, molding, the heat is no longer softening, and therefore can not be recycled, such as phenolic plastics, amino plastics, epoxy resin, etc. belong to this kind of plastic. Thermosetting plastic forming process is more complex, so continuous production has some difficulties, but its good heat resistance, not easy to deformation, and the price is relatively low.

Q:What is the plastic bag made of?

The main raw material of plastics is oil and natural gas, that is, carbon hydrogen compounds. First, the appropriate macromolecular components in petroleum and natural gas are extracted, first split into monomers, and then polymerized into polymers to become plastic

Q:How many kinds of raw materials are produced by wrapping plastic film?

Plastic film raw materials are: PVC, polyethylene, polypropylene, polystyrene and other resins.Commonly used to bundle packaging is LLDPE stretch wrap film, applicable to a variety of logistics packaging, packaging industry bundled! I can see it in Ming Bao. Yes, please!

Q:What machines and materials are needed for the manufacture of disposable plastic cups?

PP is crystalline polymer. PP is the most common plastic, and the density is only 0.91g/cm3 (smaller than water). In general plastics, PP has the best heat resistance, and its thermal deformation temperature is 80-100 DEG C and can be boiled in boiling water. PP has good stress cracking resistance and has a high bending fatigue life, commonly known as "fold gum"". PP products are light, tough and chemical resistant.Injection molding machine, also known as injection molding machine or injection machine. It is a thermoplastic or thermosetting plastic plastic molding mold made of plastic products of all shapes of the main molding equipment. The injection molding machine heats the plastic, applying high pressure to the molten plastic to make it crack and fill the mold cavity.

Q:What are the properties of plastic material PS? What are the advantages and disadvantages?

The parameters of PS plastic (polystyrene) English Name: Polystyrene weight: 1.05 g / cm3 molding shrinkage rate: temperature: 170-250 degrees 0.6-0.8% molding material properties of electrical insulation (especially high-frequency insulation) excellent, colorless and transparent, light transmittance after organic glass, color of water resistance, good chemical stability, strength, but brittle that is easy to produce stress cracking, no resistance to benzene. Gasoline and other organic solvents. Suitable for production of transparent insulation. Trim and chemical equipment. Optical instrument parts forming performance.

Q:Will plastic raw materials (such as PET, PP, etc.) be made of non-woven fabrics, will certainly contain BPA?

Only PC (polycarbonate) is available.If the customer is not sure, you can take your product to the third party organization testing, prove that you can do without BPA, and ask your supplier to provide inspection reports and guarantee without BPA.

Q:What are the raw materials for making plastics?

Polymer: any of the pure or polymeric materials produced by the polymerization process, whether natural or synthetic resins, are polymers, polymers, or polymers

Q:How are plastic products made? What is the raw material of plastics?

Plastic raw materials are particles, the production principle is similar