TRVV/TRVVP Flexible Cables / TRTPU, TRTPUP Ultra Flexible Drag Chain Cables

T stands for trailing chain cable;

R for flexible cable;

V special hybrid elastomer (PVC) insulation;

V special mixed elastomer (PVC) sheath;

S for twisted pair;

P for shielded.

TRVVSP flexible cable, full name copper core PVC insulation PVC sheath twisted shielded drag chain flexible cable.

2. The so-called elastomer refers to the glass transition temperature is lower than the room temperature, elongation at break > 50%, after the withdrawal of external forces, the recovery of the polymer material is relatively good. Polyurethane elastomer is a special class of elastomers, polyurethane elastomers have a wide range of hardness and a wide range of properties, so polyurethane elastomers are a class of polymer materials between rubber and plastic.

3. can be heated plasticization, chemical structure, no or little crosslinking, its molecules are basically linear, however, there is a certain physical crosslinking. This type of polyurethane is called TPU .

4. Main components: polyester type and polyether type.

Characteristics: wide range of hardness, abrasion resistance, oil resistance, transparent.

5.CharacteristicsThe main characteristics of TPU are:

Wide range of hardness: by changing the ratio of the reaction components of TPU, you can get different hardness products, and with the increase in hardness, its products still maintain good elasticity and wear resistance.

High mechanical strength: TPU products have outstanding load-bearing capacity, impact resistance and shock absorption.

Outstanding cold resistance: TPU's glass transition temperature is relatively low, at -35 degrees Celsius still maintains good elasticity, flexibility and other physical properties.

TPU as an elastomer is a material between rubber and plastic, which is seen from its rigidity, the rigidity of TPU can be measured by the modulus of elasticity. The modulus of elasticity of rubber is usually in the range of 1~10Mpa, TPU is in the range of 10~1000Mpa, and plastics (nylon, ABS, PC, POM) are in the range of 1000~10000Mpa. The hardness range of TPU is quite wide, from Shore A 60~Shore D 80, and it has high elasticity in the whole hardness range; TPU has flexibility in the wide range of temperatures, from -40~120℃, without the need to be changed. TPU is flexible over a wide temperature range from -40 to 120°C without the need for plasticizers; TPU has good resistance to oils (mineral oils, animal and vegetable fats and lubricants) and many solvents; TPU also has good weathering resistance and excellent resistance to high-energy radiation. Well-known abrasion resistance, tear resistance, flexural strength are excellent; high tensile strength, elongation, long-term compression permanent deformation rate is low, etc. are the significant advantages of TPU.

TPU properties introduced here include three aspects: mechanical properties, physical properties and environmental performance. 1.

1. Mechanical properties: TPU elastomer mechanical properties mainly include: hardness, tensile strength, compression, tear strength, resilience and wear resistance, flexural disturbance resistance, etc., while the mechanical properties of TPU elastic plastics, in addition to these properties, there are higher shear strength and impact power.

(a) Hardness: hardness is an indicator of a material's ability to resist deformation, scoring and scratching, TPU hardness is usually measured by Shore A (Shore A) and Shore D (shore D) hardness tester, Shore A is used for softer TPUs, Shore D is used for harder TPUs. hardness is mainly determined by the content of hard segments in the structure of the TPU, the higher the content of the hard segments, the hardness of the TPU will rise with. Hardness is mainly determined by the content of hard segments in the TPU structure. After the hardness rises, other properties of TPU will also change, tensile modulus and tear strength increases, rigidity and compressive stress (load capacity) increases, elongation decreases, density and dynamic heat generation increases, and environmental resistance increases. the hardness of the TPU and the temperature of the existence of a certain relationship. Cooling down from room temperature to the sudden change in temperature (-4 ~ -12 ℃), the hardness does not change significantly; in the sudden change in temperature, the TPU hardness suddenly increased and become very hard and lose elasticity, which is due to the soft section of the crystallization effect.

(b) Relationship between hardness and constant elongation stress and elongation and relationship between hardness and tear strength. As the hardness of TPU increases, the 100% constant tensile stress and 300% constant tensile stress increase rapidly and the elongation decreases. This is mainly due to the result of the increase in the hard section content: high hard section content, the formation of hard sections of the phase is more likely to form a sub-crystalline or crystalline structure increases the number of physical cross-linking and limit the deformation of the material. If the material deformation must increase the stress, thus increasing the fixed tensile stress, while the elongation decreases. tpu hardness and tear strength relationship, with the increase in hardness, tear strength increases rapidly, the reason is also the same as the modulus of the explanation.

Uses: engineering products, automotive engineering parts; fire hoses, hard and soft composite products; gearshift ball handle, roller, couplings, rings and seals; cable sheathing, textile coating, drive belts, hoses, cable glands, hose fittings, mining screens, film and extrusion profiles; gears, goggle frames, buffers, sports shoe soles and casters, hammock straps, straps, and so on.

TPU Chinese name: thermoplastic polyurethane. Thermoplastic TPU Elastomer.

TPU plastic material

TPU elastomer is made from MDI containing NCO functional group and POLYOL containing OH functional group, 1.4BG, through extrusion and mixing. Due to its good elasticity, good physical properties, and various mechanical strengths, TPU elastomer is widely used in injection, extrusion, calendering, and dissolution into solution resin, etc., and is a plastic material often used by plastics processors, and the products made of TPU cover the range of industrial applications and necessities of people's lives.

The use of thermoplastic PU elastomers is continuously increasing, creating new opportunities for low-cost, high-value-added industries for plastics processors.

Because of its superior performance and environmental protection concept is increasingly popular, TPU can be a substitute for PVC. However, the advantages of TPU are beyond the reach of PVC, TPU not only has excellent high tension, high tensile strength, toughness and aging resistance, but also is a mature environmentally friendly material.

Characteristics

1、Abrasion resistance

When the material is often subject to friction in the process of use, scraping, grinding, research and frustration and other mechanical effects, will cause its surface to gradually wear, so the choice of material abrasion is very important.TPU plastic raw materials excellent abrasion resistance, wear-resistant natural rubber more than five times, is one of the first choice of wear-resistant products materials.

2, tensile properties

Tensile strength up to 70MPa, elongation at break can be as high as 1000%.

3、Tearing performance

Elastomer in the application due to the creation of cracks to expand the damage is called tearing, tear strength is the ability of the material to resist the action of tearing; generally speaking, TPU has a high resistance to tearing, tear strength and some commonly used rubber and plastic comparisons is very excellent.

4, flexural properties

Many plastic materials in the repetitive cyclic stress is prone to fracture, TPU products in different environments can maintain excellent flexural properties, one of the best choice for polymer materials.

5、Hydrolysis resistance

TPU in the turbid water resistance is good, 1 ~ 2 years will not occur significantly hydrolyzed, especially with the polyether series is better. Polyester series in 50 ℃ water immersion for half a year or 70 ℃ immersion 3 weeks or 100 ℃ immersion 3 ~ 4 days, will be completely decomposed, which is suitable for TPU as an environmentally friendly materials, one of the reasons, need to be in regular contact with water products, it is recommended to use the polyether series.

6, high temperature and oxidation resistance

General plastic raw materials are easy to oxidize in the environment above 70 ℃ for a long time, TPU antioxidant ability is good; generally speaking, TPU temperature resistance up to 120 ℃.

7, oil and drug resistance

TPU is a strong polar polymer materials, and non-polar mineral oil affinity is very small, in the fuel oil (such as kerosene, gasoline) and mechanical oils (such as hydraulic oil, oil, lubricants, etc.) in the almost non-erosion; which, TPU products and polyester series of products with oil resistance is better; TPU film and sheet for the volume of oil and grease changes are very small, tensile strength is even higher than the original initial value; need to be careful! It should be noted that if there is a small amount of water in the mineral oil, it will have different degrees of negative impact on the physical properties of the film.

8, low temperature performance

TPU has very good low-temperature resistance, usually up to -50 ℃, can replace the general PVC due to low-temperature embrittlement and can not be applied in various fields, especially suitable for use in the cold zone related to the type of products.

Technical Parameters

Detailed description

Model

Corresponding product model

Characteristic