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Polydopamine for β-nucleation of polypropylene and polydopamine/polypropylene composites

A technology of polydopamine and composite materials, which is applied in the field of preparation of additives for polymer materials, can solve the problems of poor interaction between polypropylene matrix, decreased β nucleation efficiency, and single function, so as to improve thermo-oxidative stability and reduce Free radical concentration, effect of simple equipment

Active Publication Date: 2018-06-01
SICHUAN UNIV
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Problems solved by technology

[0004] With the development of new synthesis and processing technologies in recent years, the types of β-nucleating agents and their nucleation efficiency have also been significantly improved. However, the existing β-crystal nucleating agents often have certain problems, such as relatively high preparation costs High, low nucleation efficiency, poor interaction with polypropylene matrix, decreased β nucleation efficiency after repeated processing, and single function

Method used

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  • Polydopamine for β-nucleation of polypropylene and polydopamine/polypropylene composites
  • Polydopamine for β-nucleation of polypropylene and polydopamine/polypropylene composites
  • Polydopamine for β-nucleation of polypropylene and polydopamine/polypropylene composites

Examples

Experimental program
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Effect test

Embodiment 1～4

[0041] Preparation of β crystal nucleating agent polydopamine:

[0042] Dissolve 9.086g of Tris in 1500ml of deionized water and stir evenly for 10min. The pH of the solution was then adjusted to 8.5 with concentrated hydrochloric acid. After the pH of the above solution was stabilized at 8.5, 6.750 g of dopamine powder was added and stirred evenly for 10 min. The reaction system was moved to an oil bath at 60° C. and stirred for 24 hours. After the reaction, the reaction system was subjected to suction filtration and washed with deionized water, and the washing process was repeated three times. Finally, the washed polydopamine was dried in a vacuum oven at 40° C. to finally obtain a dark brown polydopamine powder.

[0043] Preparation of polypropylene / polydopamine composites:

[0044] In the first step, prepare materials by corresponding components (see Table 2);

[0045] In the second step, the polypropylene and polydopamine powders were dried in a vacuum oven at 40°C f...

Embodiment 5-8

[0065] The raw materials and their weight proportions of Examples 5-8 are shown in Table 1, and the preparation method of the polypropylene / polydopamine composite material is the same as that of Example 1.

[0066] The experimental results all show that: the polydopamine particles prepared by method 2 can be well dispersed in the polypropylene matrix. After DSC and XRD characterization results, it is found that a lower content of particles can significantly induce the formation of β crystals in polypropylene, which is a An efficient β-nucleating agent. According to the results of oxidation induction test, it is found that polydopamine particles with different particle sizes prepared by different methods can significantly improve the thermo-oxidative stability of polypropylene materials, which shows that polydopamine particles are a multifunctional and efficient β-nucleating agent.

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Abstract

The invention belongs to the technical field of preparation of promoters for high polymer materials and particularly relates to a preparing method for a multifunctional and efficient beta nucleating agent for isotatic polypropylene materials. It is indicated that polydopamine can be used in the polypropylene beta nucleating agent. The multifunctional and efficient beta crystal nucleating agent is high in nucleating efficiency, good in compatibility with polypropylene matrixes, simple in preparing method and capable of improving the thermal oxidation stability of polypropylene materials.

Description

technical field [0001] The invention belongs to the technical field of preparation of auxiliary agents for polymer materials, and in particular relates to a preparation method of a multifunctional and high-efficiency beta nucleating agent for isotactic polypropylene materials. Background technique [0002] Polypropylene (PP) is a semi-crystalline polymer, which can produce crystalline forms such as α, β, γ, δ and pseudo-hexagonal states according to different crystallization conditions. PP generally produces a relatively stable and common α-crystal structure under ordinary processing conditions. Since the β crystal structure is less stable than the α crystal structure, it can only be obtained under special conditions, such as under the action of a certain temperature gradient field, shear force field, or in the presence of a β nucleating agent. In addition to maintaining the good comprehensive properties of the α crystal form, the β crystal form PP has the advantages of hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L79/02C08G73/02
CPCC08G73/02C08L23/12C08L2205/24C08L79/02
Inventor 黄亚江刘世乡杨俊龙吕亚栋杨其李光宪
Owner SICHUAN UNIV
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