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Preparation method of polyethylene nucleating agent

A nucleating agent, polyethylene technology, applied in the field of preparation of new polyethylene nucleating agent, can solve the problems affecting the application of polyethylene materials, warping deformation, large shrinkage rate, etc., achieve high crystallinity, easy molding and cooling, The effect of high crystallization temperature

Inactive Publication Date: 2019-01-18
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyethylene is rarely used in the field of injection molding. This is because the material itself has a large shrinkage rate, and polyethylene materials are prone to warping and deformation due to their long molecular chains and slow crystallization after injection molding, which greatly affects the quality of polyethylene materials. Application in injection molding plastics

Method used

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  • Preparation method of polyethylene nucleating agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put 2mmol of 1,3 propylenediamine and 1.2mmol of phenylurea into a round bottom flask, then add 15mL of dioxane, under the protection of nitrogen, reflux at 110°C for 18h, after the reaction is completed, cool to room temperature; after adding 12 mL of ethyl acetate to the flask, wash it 4 times with HCl with a concentration of 1.0 mol / L, the amount of HCl is 50 mL / time, and the organic layer after standing and layering is dried with anhydrous sodium sulfate and spin Steam, and then recrystallize the solid product after rotary steaming with methanol to obtain the final product.

Embodiment 2

[0017] Put 2mmol of 1,3 propylenediamine and 1.0mmol of phenylurea into a round bottom flask, add 18mL of dioxane, under the protection of nitrogen, carry out a reflux reaction at 105°C for 16h, after the reaction is completed, cool to room temperature, and pour Add 10mL ethyl acetate to the flask, and wash it with 1.2mol / L HCl for 3 times. The amount of HCl is 45mL / time. The final solid product was then recrystallized with methanol to obtain the final product.

Embodiment 3

[0019] Put 2mmol of 1,3 propylenediamine and 1.3mmol of phenylurea into a round bottom flask, add 12mL of dioxane, under the protection of nitrogen, carry out reflux reaction at 115°C for 17h, after the reaction is completed, cool to room temperature , add 12mL ethyl acetate to the flask, and wash it with 1.3mol / L HCl for 4 times. Recrystallization to obtain the final product.

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Abstract

The invention discloses a preparation method of a polyethylene nucleating agent. The preparation method comprises the steps as follows: firstly, 1,3-propanediamine and phenylurea are mixed, dioxane isadded, the mixture is subjected to a reflux reaction at 100-120 DEG C for 15-20 h under the protection of nitrogen, after the reaction, a product is cooled to the room temperature; ethyl acetate is added to dissolve reactants which do not react completely; a reaction solution is washed with acid; an organic layer obtained after standing layering is dried by anhydrous sodium sulfate, rotary evaporation is performed, a solid product obtained after rotary evaporation is recrystallized by methanol, and a final product is obtained. The product obtained through a polymerization reaction of 1,3-propanediamine and phenylurea has a better crystallization promotion function on a polyethylene material, the spherocrystal size of polyethylene can be significantly reduced, and the mechanical performance of the material can be remarkably improved.

Description

Technical field: [0001] The invention belongs to the technical field of polymer material modification, and in particular relates to a preparation method of a novel polyethylene nucleating agent. Background technique: [0002] Polyethylene is currently the most widely used plastic product on the market. Due to its excellent chemical stability, weather resistance and mechanical properties, it is widely used in film, engineering plastics, pipes and other fields. However, polyethylene is rarely used in the field of injection molding. This is due to the large shrinkage rate of the material itself, and polyethylene materials are prone to warping and deformation after injection molding due to their long molecular chains and slow crystallization, which greatly affects polyethylene materials. application in injection molding plastics. Invention content: [0003] The purpose of the present invention is to provide a preparation method of a novel polyethylene nucleating agent, so tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C273/18C07C275/28C07C275/14C08K5/21C08L23/06
CPCC07C273/1809C08K5/21C07C275/28C07C275/14C08L23/06
Inventor 杨桂生计娉婷廖雄兵朱敏
Owner HEFEI GENIUS NEW MATERIALS
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