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Method for nucleating and modifying polypropylene through rare earth complex

A rare earth complex, polypropylene technology, applied in the preparation of carboxylate and other directions, can solve the problems of low thermal deformation temperature, high low temperature brittleness, limited application, etc., and achieve the effects of simple preparation process, improved crystallization performance, and less environmental pollution

Inactive Publication Date: 2014-03-12
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, PP has the disadvantages of high low temperature brittleness, low heat distortion temperature, and easy shrinkage, so its application in extreme environments is very limited

Method used

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  • Method for nucleating and modifying polypropylene through rare earth complex

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add ammonium hydrogen maleate solution (0.1mol / L) and lanthanum chloride solution (0.05mol / L) at a molar ratio of 4:1 to the container, and adjust the pH with ammonia water at a temperature of 30°C = 4.0, stirring and reacting to form a precipitate, which was fully washed with distilled water and filtered, then vacuum-dried at 90°C for 18 hours to obtain MALa with a yield of 11%.

Embodiment 2

[0020] Add sodium hydrogen maleate solution (0.3mol / L) and lanthanum nitrate solution (0.1mol / L) into the container with a molar ratio of 3:1, and use sodium hydroxide solution at a temperature of 50°C Adjust the pH to 5.5, stir and react to form a precipitate, which is washed and filtered with distilled water, and then vacuum-dried at 90°C for 18 hours to obtain MALa with a yield of 42%.

Embodiment 3

[0022] Add potassium hydrogen maleate solution (0.5mol / L) and lanthanum chloride solution (0.3mol / L) into the container with a molar ratio of 1.8:1, and use potassium hydroxide under the condition of 60°C The pH of the solution was adjusted to 6.0, and the reaction was stirred to form a precipitate. The precipitate was fully washed with distilled water and filtered, and then vacuum-dried at 90°C for 18 hours to obtain MALa with a yield of 63%.

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Abstract

The invention discloses a method for nucleating and modifying polypropylene through a rare earth complex. The method is characterized by comprising the steps of firstly uniformly mixing 100% of polypropylene and 0.2-4.0% of maleic acid lanthanum (MALa) by weight, then fusing and internally mixing uniformly, cooling and curing so as to obtain the modified polypropylene. The invention also discloses a direct sedimentation method for preparing lanthanum maleate. The method is characterized by comprising the steps of mixing a hydrogen maleate salt solution with an inorganic lanthanum salt solution according to certain proportion, regulating pH to be 4.0-7.0 with aqueous alkali at 30-80 DEG C, reacting completely so as to generate precipitate, and filtering, purifying and drying the precipitate so as to obtain the maleic acid lanthanum. According to the method, MALa is added for modifying PP (polypropylene), so that the nonisothermal crystallization peak temperatures respectively rise toward high temperature, and the peak width at half height of the crystallization peak is narrowed. A DSC (differential scanning calorimetry) test result shows that the MALa is an effective nucleating and modifying agent for the PP and can improve the crystallization property of the PP.

Description

technical field [0001] The invention belongs to the field of chemical synthesis and application, and in particular relates to the preparation of a rare earth complex and the application of nucleated modified polypropylene. Background technique [0002] Complexes are a relatively large subcategory of compounds, which are widely used in daily life, industrial production and life sciences, and have developed particularly rapidly in recent years. The methods for preparing complexes mainly include direct method, solid phase synthesis and component exchange synthesis. The direct method is a synthetic method in which the central ion and the ligand are directly coordinated. This method is more suitable for reactions where the central ion is easy to coordinate with the ligand and the product is easy to separate from the substrate. The solid-state reaction method is a multiphase reaction between metal ions and ligands. In this method, the melting point of the ligands is generally low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/098C07C57/145C07C51/41
CPCC08K5/098C07C51/41C08L2205/24C08L23/12C07C57/145
Inventor 肖荔人左冬强陈庆华黄宝铨陈荣国钱庆荣刘欣萍许兢
Owner FUJIAN NORMAL UNIV