What material is TPU? What is the difference between raw material tpu and pu?

Sumino TPU film casting machine

TPU is a new type of plastic that is widely used. It looks similar to plastic. Below, the editor of Sumino Precision will introduce the meaning of TPU material and the difference between TPU and PU.
1. TPU
TPU (Thermoplastic Polyurethane Elastomer) is a new type of plastic. Because TPU has good processability, weather resistance, and environmental protection, it is widely used in shoe materials, pipes, films, rollers, cables and wires and other related industries. Polyurethane thermoplastic elastomer, also known as thermoplastic polyurethane rubber, or TPU for short, is an (AB) n-type block linear polymer, A is a high molecular weight (1000-6000) polyester or polyether, and B contains 2-12 straight For the diols of chain carbon atoms, the chemical structure between the AB segments is connected with diisocyanate, usually MDI. The general structural formula is shown in the figure. Thermoplastic polyurethane rubber is cross-linked by intermolecular hydrogen bonds or lightly cross-linked between macromolecular chains. As the temperature increases or decreases, these two cross-linked structures are reversible. In the molten state or the solution state, the intermolecular force is weakened, and after cooling or solvent volatilization, there is a strong intermolecular force to connect, restoring the original solid properties.

Polyurethane thermoplastic elastomer has two types, polyester type, and polyether type, white random spherical or columnar particles, relative density 1.10-1.25, the relative density of polyether type is lower than polyester type. The glass transition temperature of the polyether type is 100.6-106.1°C, and the glass transition temperature of the polyester type is 108.9-122.8°C. The polyester type's brittleness temperature is lower than -62℃, and the low-temperature resistance of hard ether type is worse than that of the polyester type.
The outstanding characteristics of polyurethane thermoplastic elastomer are excellent wear resistance, excellent ozone resistance, high hardness, high strength, good elasticity, low-temperature resistance, good oil resistance, chemical resistance, and environmental resistance. Polyether in humid environments The hydrolytic stability of type ester far exceeds that of polyester type.
Polyurethane thermoplastic elastomer is non-toxic and tasteless, soluble in solvents such as methyl ethyl, cyclohexanone, tetrahydrofuran, dioxane, dimethylformamide, etc., and also soluble in toluene, ethyl acetate, methyl ethyl ketone, acetone, etc. The mixed solvent of the proportion of composition presents a colorless and transparent state and has good storage stability.

2. PU

PU polyurethane is a general term for polymer compounds formed by the reaction of diisocyanate or polyisocyanate with compounds with more than two hydroxyl groups. The main chain contains many repeating NHCOO groups. Commonly used diisocyanates are toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), di-cyclohexyl methane diisocyanate (HMDI), poly Methyl polyphenyl polyisocyanate (PAPI), xylylene diisocyanate (XDI), etc. The different hydroxyl components used can be divided into two types: polyester type and polyether type. It can be used to manufacture plastic products, wear-resistant synthetic rubber products, synthetic fibers, rigid and soft foamed plastic products, adhesives, and coatings.

3.The difference between TPU and PU
TPU and PU are essentially composed of the same material. But when making these two compounds. The formula they use is not the same. These two kinds of rubber materials are divided into many kinds of properties.
The properties of rubber compounds made with different formulas are not the same. These characteristics refer to mechanical characteristics and physical characteristics.
Both types of rubber materials can be used for wire. This depends on where your wire is used in the electrical appliance. And what kind of special requirements do you have for your wire? Choose which kind of rubber to use.

4. Are TPU materials toxic?

Non-toxic, TPU material can be reused, the material can decompose itself after a certain period of time, will not cause pollution to the environment, it is called environmental protection material.

5. The main characteristics of TPU

• 1. Wide range of hardness: By changing the ratio of each reaction component of TPU, products with different hardness can be obtained, and as the hardness increases, the product still maintains good elasticity and wear resistance.
• 2. High mechanical strength: TPU products have outstanding bearing capacity, impact resistance, and shock absorption performance.
• 3. Outstanding cold resistance: The glass transition temperature of TPU is relatively low, and it still maintains good elasticity, flexibility, and other physical properties at minus 35 degrees.
• 4. Good processing performance: TPU can be processed by common thermoplastic material processing methods, such as injection molding, extrusion, calendering, and so on. At the same time, TPU and certain polymer materials can be processed together to obtain polymer alloys with complementary properties.
• 5. Oil resistance, water resistance, and mildew resistance.
• 6. Good recyclability.
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• Company Profile

  
  Nanjing Sumino Precision Machinery Co., Ltd. is a high-tech enterprise integrating scientific research, production and sales. It has always adhered to the business philosophy of integrity, equality, and customer benefits. In order to better improve the quality of equipment, it has entered a more professional and standardized Production track. We have established independent research and development technologies for seven categories of equipment including plastic sheet material, casting, bi-stretching, non-woven non-woven meltblown cloth, laminating film composite, recycled granulation environmental protection recycling system and coating machine manufacturing system. The center and production department provide a full set of professional technical solutions to meet the special needs of each customer. Among them, the biaxially oriented film manufacturing system includes: BOPP biaxially oriented film manufacturing system, PVC biaxially oriented shrink film production line, PET biaxially oriented film production line, BOPA biaxially oriented film production line, BOPA biaxially oriented film production line, etc.
  

  Company Address: No. 11, Kaifeng Road, Moling Street, Jiangning District, Nanjing City, Jiangsu Province