Liquid-crystal poly(methyl)acrylate beta-crystal-form polypropylene nucleating agent and preparation method thereof

Abstract

The invention relates to the technical field of nucleating agents, and particularly relates to a liquid-crystal poly(methyl)acrylate beta-crystal-form polypropylene nucleating agent and a preparation method thereof. The liquid-crystal poly(methyl)acrylate beta-crystal-form polypropylene nucleating agent provided by the invention uses a poly(methyl)acrylate chain as the macromolecule frame, and uses a mesogenic unit as a side chain, wherein the mesogenic unit comprises a flexible space group, a liquid-crystal nucleus, and an alkyl or alkoxy group. The preparation method of the liquid-crystal poly(methyl)acrylate beta-crystal-form polypropylene nucleating agent comprises the following steps: synthesizing a double-bond-containing liquid-crystal monomer; dissolving 2-5g of the liquid-crystal monomer in 50-100 ml of solvent, and adding 0.02-0.005g of azodiisobutyronitrile at 60 DEG C to react for 12-24 hours; and pouring the reactant in methanol, precipitating, filtering, washing with ethanol three times, and drying to obtain the final product.

Description

technical field [0001] The invention relates to the technical field of nucleating agents, in particular to a liquid crystal poly(meth)acrylate β-crystal polypropylene nucleating agent and a preparation method thereof. Background technique [0002] Polypropylene (PP) has the advantages of low relative density, non-toxicity, heat resistance, corrosion resistance, excellent electrical insulation, easy processing and low price. It has become the fastest growing and most active in the development of new varieties among the five general-purpose synthetic resins. Varieties, widely used in chemical industry, light industry and household appliances and other fields. PP is a semi-crystalline polymer that presents α , β , gamma , δ and 5 shapes of pseudo-hexagon, among which α Crystal and β Crystals are relatively common, and their crystal structure and morphology directly affect the final physical and mechanical properties of PP materials. [0003] Typically, commercial polypr...

AI Technical Summary

Problems solved by technology

So far, there are four main types of β crystal nucleating agents reported in the literature: ① Certain condensed ring compounds with quasi-planar structures, such as γ-crystalline quinacridone, etc., have the disadvantage of easily coloring the product ; ② Certain salts of Group IIA metal elements and complexes of dicarboxylic acids, such as complexes of pimelic acid and calcium stearate, etc. The disadvantage is that the heat resistance of this type of nucleating agent is poor; ③ Amides Nucleating agent, such as 2, 6-phthalic acid cyclohexylamide, etc.; ④Rare earth nucleating agent, such as lanthanum carbide, etc.

The above β crystal nucleating agents are all small molecular compounds, although these small molecular β crystal nucleating agents have high nucleation efficiency, and some have been applied, but they There are also problems in PP such as "strong agglomeration", "poor dispersion" and "easy to precipitate from the PP matrix".

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