China's TPU film factory successfully developed new film materials
at present, there are many TPU film factories in China, moreover, TPU is widely used in many fields such as automobile manufacturing, refrigerator manufacturing, transportation, civil construction, footwear, synthetic leather, fabric, electromechanical, petrochemical, mining machinery, aviation, medical treatment, agriculture, etc, it has the characteristics of high strength, good toughness, wear resistance, cold resistance, oil resistance, water resistance, aging resistance, weather resistance and the like that are incomparable to other plastic materials, at the same time, it has many unique functions such as high water resistance, moisture permeability, wind resistance, cold resistance, antibacterial, mildew resistance, warmth resistance, ultraviolet resistance and energy release.
The production and manufacturing process of TPU film mainly adopts film blowing method and casting method. However, TPU films produced by these two methods have low output, high energy consumption, high cost and are difficult to form large-scale production. The research team of Baoding bangtai polymer New Materials Co. , Ltd. has been continuously tackling key problems for more than a year, and finally developed a new type of TPU material that can meet the production of calendering process on the basis of maintaining the original physical properties. The film produced by calendering process has small physical property loss, excellent quality and beautiful appearance. It is estimated that the annual output of a single set of four-roll calendering and mixing equipment can reach more than 6000 tons.
TPU film prepared by dense rolling method can greatly improve the above problems. Closed rubber mixing method (Mixing Method) The working principle is that through the relative rotation of the two rotors in the internal mixer, the materials from the feeding port are clamped and brought into the roll gap to be squeezed and cut by the rotors, after passing through the roller gap and touching the lower top, the sharp edge is divided into two parts, which are respectively along the gap between the front and rear chamber walls and the rotor and then return to the top of the roller gap.
during the flow around the rotor, the material is subjected to shearing and friction everywhere, causing the temperature of the material to rise sharply, uniformly shearing macromolecules and increasing fluidity. According to the working principle of mixing method, the mixing method is applied to the preparation of TPU downstream products, which can effectively control the appearance of Crystal points and accumulated materials in the film, and is especially suitable for the production of TPU film.
at the same time, the mixing method also has the advantages of large mixing capacity, short time and high production efficiency; Safe and convenient operation, reduce labor intensity; It is beneficial to realize the advantages of mechanical and automatic operation. At the same time, the film uniformity can be effectively controlled by calendering the film. Dense refining calendering method has been widely used in pvc film manufacturing industry, but as a new environmentally friendly material to replace pvc, TPU dense refining calendering has not been reported. The main technical difficulty is to make the new TPU material suitable for mixing and calendering process on the basis of maintaining the excellent physical properties of TPU.
TPU film is a plastic material often used by plastic processors. Its products cover the scope of industrial applications and civil necessities. After nearly a year of hard work, domestic TPU film factories have successfully developed new TPU materials that can be used to prepare films by dense rolling, and have been approved by downstream customers by dense rolling process.