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Development and Application of Novel Polypropylene Nucleator

Author: HuCaiXia
Tutor: LvZhiPing
School: Taiyuan University of Technology
Course: Applied Chemistry
Keywords: Polypropylene Nucleating agent Layered materials Organophosphate 5A molecular sieve
CLC: TQ320.4
Type: Master's thesis
Year: 2007
Downloads: 265
Quote: 2
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Synthesis process is simple, inexpensive, and comprehensive performance, polypropylene (PP) is widely used as a composite material of important raw materials, but there is a poor impact resistance, high-temperature rigidity processing shrinkage, it Applications are subject to certain restrictions. Nucleating agent made the PP crystalline form can be changed, thereby improving the performance and processing properties of the PP, to expand the application range. Therefore, has become an important means of an optimized PP nucleating agent added to the PP. Preferred nucleating agent for the purpose of using X-ray diffraction analysis (XRD), differential scanning calorimetry analysis (DSC), the determination of the Vicat softening point and tensile properties, impact properties and flexural properties testing means investigated crystalline properties, thermal properties, and mechanical properties of the following types of nucleating agent for polypropylene: stearoyl silicate hydrolysis and polycondensation formation of layered materials; the different surfactant treatment organophosphate nucleating agent; and organics processing 5A molecular sieve. The results show that a stearoyloxy by hydrolyzing ethyl silicate, polycondensation to the formation of a layered material NL1 induction the PP β crystal type crystals generated in the induction of this grade polypropylene PPH-XD-045 β crystal Time same TMB-5 role of the content in a considerable, is an effective β crystal nucleating agent; add NL1 Vicat softening point of PP increased slightly; increasing the content of the tensile strength of PP with NL1 rendered remain unchanged after the first increase the law, the impact strength is increased slightly, but there was a slight decrease with increasing content of less influence on the bending strength. Distearyl group by hydrolyzing ethyl silicate, the layered material formed NL2 polycondensation induced PP crystallized α crystal type, while improving the crystallization temperature and degree of crystallinity of the PP, and added NL2 Vicat softening point of PP a 6.3 ° C, and a tensile strength of PP increased, reduces the increase of the content of the impact strength with NL2, small changes in the bending strength. Distearyl ethyl silicate processing organic phosphates PP crystallization proceeds along the (040) growth direction of the normal of the crystal plane, improve the 8.5 ° C in the crystallization temperature of PP, also slightly higher degree of crystallinity; PP has a Vicat softening point nearly 10 ℃; the nucleating agent is added, the tensile strength substantially constant, impact strength, flexural strength reduces. THF processing organic phosphate nucleating agents induced a small part PP to the β polymorph crystals, the crystallization temperature and degree of crystallinity decreased; PP Vicat softening point improves the 7.2 ° C; tensile strength and flexural strength improved impact strength than pure PP improve the 1.42kJ of / m ~~. XRD analysis showed that the organic treatment for 5A zeolite, more refinement of the crystal grains of the PP; add 0.2% of the organic matter to deal with the tensile strength and impact strength of the molecular sieve system of molecular sieve 5A so that the different contents of PP/5A greatly improved flexural strength declined slightly .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > General issues > Raw materials and auxiliary materials
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