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Method for improving dispersity of sodium benzoate nucleating agent in polypropylene

A technology of sodium benzoate and polypropylene, which is applied in the field of improving the effect of sodium benzoate nucleating agent, can solve the problems of not improving the dispersibility of sodium benzoate, poor compatibility and dispersibility, affecting dispersibility, etc., and achieves low price and improved resistance. Impact properties, the effect of increasing the crystallization temperature

Active Publication Date: 2014-06-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, sodium benzoate shows its own drawbacks in large-scale industrial production
One is that it has high hygroscopicity, making the powder made of it easy to absorb water, leading to particle agglomeration, affecting its dispersion in the target plastic, and may cause obstacles to feeding
The second is that when used as a nucleating agent, there is a problem of poor compatibility and dispersibility inherent in low molecular weight organic nucleating agents
However, the compound use of nucleating agent does not improve the dispersibility of sodium benzoate itself, and the method of improving the dispersibility of sodium benzoate in polar materials is not applicable in polypropylene, and the sodium benzoate of powder or particles is uniformly dispersed in polypropylene method to be developed

Method used

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  • Method for improving dispersity of sodium benzoate nucleating agent in polypropylene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Sodium benzoate powder 25 g is dissolved in 75 g water at 25 ℃ and is made into the aqueous solution of 25% concentration, then the sodium benzoate aqueous solution that prepares is mixed with 25 g talcum powder (2500 orders), wherein talcum powder and sodium benzoate solid The weight ratio is 1:1. Then the sodium benzoate / talcum powder mixture was dried at normal pressure at 120°C, and finally 2g of the dried sodium benzoate / talc powder mixture and 5 kg of polypropylene resin T38F were melted and mixed uniformly at 220°C in a twin-screw extruder and granulated, followed by performance testing. Wherein the sodium benzoate / talcum powder mixture consumption is 0.04%.

Embodiment 2

[0027] Sodium benzoate powder 25g is dissolved in 100g water at 25 ℃ and is made into the aqueous solution of 20% concentration, then the sodium benzoate aqueous solution that prepares is mixed with 25g talcum powder (3000 orders), wherein the weight ratio of talcum powder and sodium benzoate solid is 1:1. Then the sodium benzoate / talcum powder mixture was dried at normal pressure at 120°C, and finally 3 g of the dried sodium benzoate / talc powder mixture and 5 kg of polypropylene resin T38F were melted and mixed uniformly at 220°C in a twin-screw extruder and granulated, followed by performance testing. Wherein the sodium benzoate / talcum powder mixture consumption is 0.06%.

Embodiment 3

[0029] Sodium benzoate powder 25g is dissolved in 50g water at 25 ℃ and is made into the aqueous solution of 33% concentration, then the sodium benzoate aqueous solution that prepares is mixed with 50g talcum powder (5000 orders), wherein the weight ratio of talcum powder and sodium benzoate solid is 2:1. Then the sodium benzoate / talcum powder mixture was dried at normal pressure at 120°C, and finally 5 g of the dried sodium benzoate / talc powder mixture and 5 kg of polypropylene resin T38F were melted and mixed uniformly at 220°C in a twin-screw extruder and granulated, followed by performance testing. Wherein the sodium benzoate / talcum powder mixture consumption is 0.1%.

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Abstract

The invention provides a method for improving the dispersity of a sodium benzoate nucleating agent in polypropylene. The method makes sodium benzoate disperse uniformly in polypropylene resin so as to improve the crystallization temperature and impact resistance of polypropylene. The method provided in the invention comprises: firstly preparing sodium benzoate into an aqueous solution containing 20%-35% of sodium benzoate by mass, then mixing the sodium benzoate aqueous solution with talcum powder evenly, with the talcum powder and the sodium benzoate solid being in a mass ratio of 0.5:1-3:1, finally conducting drying under 110-150DEG C to obtain a sodium benzoate-talcum powder mixture, mixing the dried sodium benzoate-talcum powder mixture with polypropylene resin, and performing extrusion as well as granulation. The method provided in the invention can make the sodium benzoate uniformly dispersed in polypropylene resin, give full play to the effect of sodium benzoate as a nucleating agent, improve the crystallization temperature and simultaneously enhance the product impact resistance.

Description

technical field [0001] The invention relates to a method for improving the effect of a sodium benzoate nucleating agent, more specifically a method for improving the crystallization temperature and impact resistance of the polypropylene resin by uniformly dispersing the sodium benzoate in the polypropylene resin. Background technique [0002] The crystallization modification of thermoplastic resin is an important way to realize its high performance and high functionality. A nucleating agent is a modifier that promotes the crystallization of a polymer and improves its grain structure. Adding a nucleating agent to a thermoplastic resin can increase its crystallization rate, shorten the molding cycle, and improve the mechanical and thermal properties of the product. Nucleating agent is an important polymer additive, and there are many kinds according to its performance and application. Commonly used nucleating agents for thermoplastic materials include sorbitol acetals, organ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/20C08L23/12C08K5/098C08K3/34
Inventor 李朋朋邓守军邵月君樊洁魏福庆许惠芳谢昕刘敏巨娟侠郭义
Owner PETROCHINA CO LTD
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