Study on polyoxymethylene polyurethane high toughness alloy

Plastic Industry 0 Quality Score, 1. Content Pair, 0 Elbow 1. Effect of Mechanical Strength of Blends It can be seen that the notched impact strength of the blend system of elbow and mouth increases with butane, content and addition, but increases. The degree is very limited, and the decrease in tensile strength is in line with the increase in rubber and plastics as conventional 1. Because the height of the 0-cubic structure determines the compatibility with other resins is not easy, therefore, purely small, with Blending does not achieve a good toughening effect.

2.2 Influence of the compatibilizer 0, 01 on the toughness of the blend In order to improve the impact toughness of the strong blend, we have prepared a compatibilizer and its compatibilizing effect 2.

From the above test results and 51 photographs can be used to fight, capacity; on the elbow of the blend system has a good compatibilization, and now the 3 experimental morphology samples were frozen in liquid nitrogen after the brittle fracture, off 1 solvent etching 1 Plating the impact of the public sample is followed by one-off forging gold, and then micro-examination experiments.

2 Results Discussion 2.1017 System Mechanical Strength Polyoxymethylene Polyurethane High Tenacity Alloys Research Wenying Ying Zhang Xuedong Li Yingchun Xing Zhiguang Department of Chemical Engineering, North China University of Technology, Taiyuan 030051 Prepared by mechanical blending method, 0 PCT 7. Alloy 5 examined D, 0 content increased The influence of the filler and morphological structure on the initial properties of the blend. The results show that the toughness of the blend increases with the increase of the TPU content; the blending method and the morphological structure have a great influence on the properties of the blend; the compatibilizer G promotes the TPU dispersion to achieve a high initialization of the blend. Key components.

Polyoxymethylene has high strength and rigidity, good dimensional stability, excellent corrosion and wear resistance, self-lubricating and creep resistance, and particularly outstanding fatigue resistance. It is a resin that has a higher specific strength than other metals. Variety, but polyoxymethylene has low impact toughness and low notch sensitivity. For this reason, research on polyoxymethylene and toughening modification is of great significance.

1 Experimental Part 1.1 Materials and Equipment Matrix Polyoxymethylene was selected from Korea Ling Corporation 002 formic acid, and thermoplastic polyurethane was selected from Tianjin Polyurethane Elastomer Co., Ltd., 5180, a polymer-type interface compatibilizer, which was self-manufactured.

Equipment Name Model Origin Plastic Extruder Shanghai Fengcheng Machinery Factory Plastic Injection Machine Shanghai Rubber Machinery Factory Universal Prototype Machine Hebei Chengde Material Testing Machine Factory Mechanical Rally Machine Hebei Chengde Material Testing Machine Factory 1 Impact Test Machine Hebei Chengde Material Testing Machine Factory Twin Screw Extruder Chengdu Chenguang Chemical Research Institute Scanning Electron Microscopy Hitachi, Japan 1.2 Experimental Process 1.2.1 Art Flow POM Compatibilizer 1.2.2 Performance Test Mechanical Property Test Impact Test Cantilever Beam Method, Gap According to National Defense Fund for Research Funding Project The single-screw or twin-screw extruders were used to mix the single-screws of the grafts. The double-screw compounding significantly improved the notched impact strength. Taking the ratio of 6040 as an example, it increased 261 single-screw compounding and 274 twin-screw compounding respectively without adding a compatibilizer. The maximum value was about pure, 10 times the impact strength of the elbow notch, and the tensile strength also increased slightly. And the dispersion phase of the blend system was significantly refined 5, and the ductile fracture feature 6 was more pronounced.

POMrPU Blend Morphology Structure SEM Image 101 Blend Fracture Morphology 3 Photo 3 Influence of Compatibilizers on the Morphology of the Blends The present study was conducted with a relatively good compatibility with thief and blending. The structure 3 and the fracture morphology 4 of the 3 are shown in photographs, and the dices and mouths are difficult to form a good dispersion in the matrix, the particles are coarse, and the particles that can be clearly seen from the 4 and the particles at the time of the fracture are between The bond is rather weak. Under the action of external force, the material is fractured by the instability of the uneven distribution of stress, and the section is relatively neat, and the morphology is still brittle. Therefore, the impact strength is not high and it is easy to understand. .

For this purpose, a new type of polymer-type compatibilizer was prepared. The experimental results show that the addition of the compatibilizer significantly refines the disperse phase particles5, the particle size reaches the theoretical calculation value, and the fracture morphology is greatly drafted. The plastic deformation feature 6 indicates that the two-phase interfacial adhesion is strong, the stress induced by the smaller TPU particles is dispersed, the material undergoes a large plastic deformation during the fracture process, and the strong interfacial adhesion between the two phases is overcome. A large amount of energy is dissipated, and when the particle size reaches a critical value, the brittle-ductile transition is achieved, so the value of the impact strength 2 curve 1 is greatly increased, and the tensile strength of the blend is also slightly increased.

The morphological structure 3 of the sample after the blend was mixed by the twin-screw compounding, from which we can get the following information: 1 In the proportion of 40 with the butadiene content, the system did not reverse the phase, the elbow matrix is ​​still continuous phase; 2 dispersion The morphology of phase particles has undergone major changes.

Under the strong shearing action of twin screws, the dispersed phase particles have changed from spherical to slender, narrow strips. This special shape not only increases the contact area between the 10 particles and the matrix, but also requires more interface debonding. Energy, but also reduce the distance between particles, greatly enhancing the stress field curve between particles 2. The fracture morphology of the corresponding blend 6 is obviously different and general, the characteristics of the fracture, there is a large and deep tough The nest shows that the material has undergone a large plastic deformation during the fracture process and has dissipated more impact energy. This structure is not much in the general toughening system.

4 conclusions 1 dozen, mouth is, excellent, tough modifier, can be made into high toughness alloy in fixed condition 1.

(2) Increasing the interfacial adhesion is beneficial to improve the toughness of a blended material; the particle size of the disperse phase particles and the shape of the particles have a significant impact on the brittleness and transformation of the material; the processing method has a greater influence on the size and shape of the dispersed phase particles. .

3 The compatibilizer prepared improved the state in which the blend ratio between the two phases of the matrix and the toughener was less than 604. The tough modifier directly existed as the dispersed phase, and no phase reversal occurred.

5 Research, 0 kg, mouth Gong materials, its notched impact strength is pure, 0 times the resin 10 times, processing performance is good, with a given application value.

1 Liu Weili. China Plastics, 199174 This article was received in 19990918, page 6 2 Yu Demei. Research on electrical components, 6 and fiber-reinforced multiphase systems. The Institute of Polymer Materials Engineering, Institute of Chemical Engineering, Kojima University currently develops electromechanical equipment for the production of large diameter aluminum-plastic composite pipes, with an outside diameter of 405,063. The inner diameters are 32.41.51. The radial tensile forces of the pipe rings are respectively 22.2.1.2.1 PCT. The test temperatures are 8060.6010, respectively, if they are cross-linked tubes. The test temperature is 93, 10. The degree of cross-linking of aluminum-plastic pipes 65. Has reached the industry standards of the Ministry of Construction of China, and meets the United States into 3 cubits Elbow F1281 96 standards,