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        TPU Characteristic

        Release Date:2016-08-10 17:07:47 Views:5700    



        (一)Polyester (heat and chemical resistance) and polyether (low temperature resistance, hydrolysis resistance, mildew resistance and antimicrobial resistance)


        (二)High strength, wear-resisting, weather-resistant, environment-friendly, non-toxic, easy to recover and decompose, and flexible.




        1.Hardness---ASTM D-2240


        Hardness is an indicator of a material's ability to resist deformation, nicks, and scratches.Hardness of TPU is usually measured by Shore A and Shore D durometer.

        Shore A is used for softer TPU and Shore D is used for harder TPU.

        Hardness is mainly determined by the content of hard segment in TPU structure.

        The higher the content of hard segment, the higher the hardness of TPU will be. When hardness increases, other properties of TPU will also be changed, tensile modulus and tear strength increase, rigidity and compression stress (load capacity) increase, elongation decrease, density and dynamic heat generation increase, environmental resistance increase.

        The hardness of TPU is related to the temperature. Cool from room temperature to abrupt temperature (-4~-12), the hardness has no obvious change; at abrupt temperature,TPU hardness suddenly increases and becomes hard and loses elasticity, which is the result of crystallization in the soft segment.



        The relationship between hardness and tensile stress and elongation and the relationship between hardness and tear strength. With the increase of TPU hardness, the stress of 100% and 300% increase rapidly, and the elongation decreases. This is mainly due to increased hard segment content: the higher the hard segment content is, the easier the hard segment phase formed is to form subcrystal or crystal structure, which increases the amount of physical cross-linking and limits the deformation of the material. If the material is deformed, the stress must be increased, so that the constant elongation stress is increased and the elongation rate decreases. The relationship between TPU hardness and tear strength increases rapidly with the increase of hardness, and the reason is the same as the explanation of modulus.



        2.Tensile strength --- ASTM D412


        In the tensile test, the maximum tensile stress received by the specimen until it breaks is the tensile strength, and the result is expressed as MPa. Some mistakenly call it tensile breaking strength, strength of extension, etc.Tensile strength from 28.3 to 62MPa, higher polyester type, lower polyether type.



        3.Elongation at break (elasticity)--- ASTM D412


        Elongation at break refers to the percentage of the increase in the effective standard line part (between two clamps) and the length of the initial effective standard line part (between two clamps) when the film is stretched. The elongation at break is a measure of toughness (elasticity).


        It has a large elongation at break, which indicates that the tested object has a certain single elongation when resisting impact and will not break immediately



        4.Tear strength ---- ASTM D412


        The damage of elastomers is tear due to the widening of cracks, and the tear strength is the ability to evaluate the resistance of the material to tear.


        (Physical references above:http://wenku.baidu.com/link?url=mc-2rnOCqSr_ODiK7U82t_QT_u_IYJtwAFC00rhHbjyVsPdw4hmakZ3tzfvl29bHmr2jq5FEmpdnF3GJOgpxexxVV-7CRsr1CRdGe0ekVyi



        5.Modulus of elasticity

        Macroscopic mechanical properties of materials under normal temperature and static load,it is the main basis to determine various engineering design parameters. These mechanical properties shall be measured with standard specimens on the material testing machine in accordance with the specified test methods and procedures, and the stress-strain curve of the material can be measured at the same time. TPU material 300% constant elongation modulus is 7.6 to 33 SMPa.



        6.Wear-resisting performance


        When the material is often friction, scraping, erosion and other mechanical effects of the material surface gradually abrasion.Expressed as the reciprocal of the rate or degree of wear under specified friction conditions. It has to do with the hardness of the film itself.



        7.Flexure resistance


        When the product needs to be used under repeated cyclic stress, please pay attention to the situation of fracture caused by poor flexural resistance of the material.



        8.Yellow resistance/UV resistance---ASTM G154


        (1)TPU materials are exposed to ultraviolet rays and oxygen in general environment, resulting in aging, product performance degradation and surface yellowing.

        (2)yellow resistance test reference materials.

        (3)The addition of stabilizers and absorbents also delayed the photooxidation of the aromatic species, but not to the same extent as the fatty species. In the experiment, the gray card was compared into grades 1-5. After the yellowing resistance test, such as Suntest,QUV or other tests, the color changes of the samples before and after the test were compared. The best grade was 5, which represents the basic non-discoloration. It is the color change obviously below grade3.

        Generally speaking, level 4-5, namely slight discoloration, is enough for most TPU applications. If no discoloration is required, aliphatic TPU is required, which is the so-called non-yellowing TPU. The base material is not MDI, but usually HDI or H12MDI, long-term UV test will not discoloration, aging guarantee about 2-3 years and the use of environment-related.



        9.Water resistant performance


        TPU has good water resistance in turbid water and no obvious hydrolysis will occur within 1-2 years, especially polyether series. Polyester series easy moisture absorption, soaked in 50 water for half a year or 70 soak 3 weeks or 100 soak 3-4 days, will be completely decomposed. It should be store at dry room temperature.



        10.Oil and drug resistance


        A highly polar polymer material has little affinity for non-polar mineral oils. It is almost impervious to corrosion in fuel oil (e.g. kerosene) and mechanical oil (e.g. hydraulic oil, motor oil, lubricating oil, etc.) Polyester series has better oil resistance. For oil, the volume change is very small, the tensile strength is even higher than the original initial value, and the physical properties of other materials are lower and more excellent. It should be noted that if there is a small amount of water in mineral oil, it will have different degrees of negative impact on the physical properties of the film.




        11.Heat and oxidation resistance

        When the product needs to be used for a long time in the environment of high temperature (such as 70 degrees) above, you must consider the selected material and oxygen in the air to produce oxidation (aging) phenomenon, the film can cope with all kinds of harsh environment, the general temperature resistance is about more than 130 degrees, Polyester is more resistant to heat.



        12.The low temperature performance


        TPU Film has a very good low temperature resistance can generally reach minus 30 degrees, and it can replace the general PVC will therefore embrittlement of the use of products suitable for the cold zone.



        13.Anti - mildew and antibacterial properties


        TPU Film has good anti-mildew and antibacterial properties, and can resist penicillium, aspergillus, mycelium, mixed spore and other microorganisms.



        14.Gas diffusivity (air tightness)


        TPU Film is very easy to use high frequency wave or hot pressure to weld, so it is widely used in blowing (filling) gas products, gas diffusion coefficient refers to the rate of gas diffusion through the specified area of the sample under a certain temperature and pressure. The air tightness of polyester series is better than that of polyether series.



        15.Biomedical properties


        TPU Film has excellent biological compatibility, non-toxic, no allergic reaction, no local irritation, no heat, so widely used in medical, health and other related products and sports protection equipment.





        16.Waterproof and moisture permeable


        Different from microporous films, TPU is a hydrophilic film, which is composed of a single copolymer with hard and soft chain segments arranged alternately along the macromolecular chain. Hard chain segment hydrophobic, it can prevent water droplets through, play a waterproof role. Soft segments are hydrophilic, and they can interact with water molecules, with hydrogen bonds and other intermolecular forces, absorption of water molecules on the high humidity side, through the hydrophilic groups on the polymer chain to the low humidity side desorption, so as to achieve the effect of moisture permeability. The process of moisture transmission is the process of adsorption, diffusion and desorption. (There is no hole on TPU film!!! If someone asks if you can see steam on a cup with a film over it, punch them!!)


        Reference data: http://wenku.baidu.com/link?url=FR23ZYLIIAlBzz4DniKqWEvGAN4v_6MxUGUWqhYGmyH8TaSIpMF3ALWYxZ6M0hVWToJitYQT6FTcWYQV9zN1ydZsgw4YiuVE2bNso-Qlx83



        17.Corona Treatment


        An electroshock treatment that makes the surface of the substrate more adherent.


        Reference data: http://baike.baidu.com/link?url=lQhFYFhghLirOpa_1_UtA_-fh5WxQ8QrgqiMEXSeHxEGLBexLG7Aliwhv6iFwaBY8CklzxoGUeM57YL7baR_uq


        Corona treatment has timeliness, and the treatment effect will decline to different degrees depending on the storage environment humidity and storage time of the film type. For the film that is not used immediately after treatment, the treatment power should be appropriately increased, the treatment degree should be deepened, and the film should be kept in a low-temperature dry environment as far as possible.



        18.Film surface antistatic treatment


        When two solids of different physical states come into contact with each other, charge redistribution will occur on their respective surfaces. After reseparation, each solid surface will have an excess of positive (or negative) charge than before contact. This phenomenon is called static electricity. The common way to remove static is to use surfactants, such as antistatic agents, to reduce the surface resistance of the polymer. Because of the hygroscopicity of such auxiliaries, the surface of the polymer absorbs moisture in the atmosphere and forms a very thin conductive film, thereby rapidly eliminating static electricity. In this process, water plays an important role. With the increase of atmospheric humidity, the surface conductivity of the polymer also increases, resulting in the rapid loss of static charge and better antistatic performance.



        Ester-Based 

        Ether-Based

        Wear Resistance

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        High Temperature Resistance 

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        Low Temperature Resistance 

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        Hydrolysis Resistance 

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        Antibacterial

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        Gas tightness

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        Oil Resistance 

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