Process for preparing predispersed masterbatch of polyolefin and nano calcium carbonate

A technology of nano-calcium carbonate and polyolefin, which is applied in the field of preparation of polyolefin/nano-calcium carbonate pre-dispersed masterbatch, can solve the problems of poor macroscopic uniformity of mechanical mixing, poor modification effect, dust pollution, etc., and achieve the best results Significant, avoid high energy consumption, improve compatibility effect

Inactive Publication Date: 2006-09-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing reports are to carry out long-term dry treatment with surfactants (long-chain fatty acids, alkyl polyethers, long-chain alkylsulfonic acids and their salts, etc.) in a high-speed mixer, which has high energy consumption, Disadvantages such as dust pollution and poor modification effect
In addition, due to the ultra-fine structure of nano-calcium carbonate, the flying of powder is very serious, and the macro-uniformity of mechanical mixing with polyolefin and other plastics is not good.

Method used

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  • Process for preparing predispersed masterbatch of polyolefin and nano calcium carbonate
  • Process for preparing predispersed masterbatch of polyolefin and nano calcium carbonate
  • Process for preparing predispersed masterbatch of polyolefin and nano calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In a 200-liter kneader, according to the formula of Table 1 Example 1, add 80 kilograms of nano-calcium carbonate (particle diameter is 30-65 nanometers), add 0.8 kilograms of methacrylic acid, 0.8 kilograms of methacrylic acid in sequence under low speed stirring Stearyl methacrylate, 0.008 kg of di-tert-butyl peroxide, 1 kg of sodium cetyloxypolyoxyethylene ether sulfonate (the degree of polymerization of polyoxyethylene ether is 20), 3 kg of Anhydride grafted linear low density polyethylene (grafting ratio 1.2 mmol / 100 gram) and 14.4 kilograms of linear low density polyethylene (melt flow rate is 17g / 10min), after adding, high-speed stirring 1 minute, obtains mixture.

[0048] Add the mixture into the feed hopper of the twin-screw extruder, extrude and pelletize in a twin-screw extruder with a length-to-diameter ratio of 48:1 and a screw diameter of 75 mm with 5 sections of mixing elements added to the screw. The speed of the main engine of the twin-screw extruder i...

Embodiment 2

[0051] The preparation of predispersed masterbatch refers to the formula of Example 2 in Table 1, and the preparation process conditions are the same as Example 1. The application formula is according to the formula of Example 2 in Table 2, and the mechanical properties and heat distortion temperature of the obtained NCM-2 filled polypropylene are shown in Table 4.

[0052] Example 1

[0053] Example 1

[0054] project

Embodiment 3

[0056] Press the prescription of table 1 embodiment 3, the difference of preparation process condition and embodiment 1 is: the host speed of twin-screw extruder is 280 rev / mins, and feeding speed is 40 revs / mins, each section of extruder (comprising extruder) There are 6 sections in the first section) the temperature is 180°C, 200°C, 200°C, 195°C, 195°C, 190°C in sequence. The application formula is according to Example 3 in Table 2, and the mechanical properties and heat deflection temperature of the obtained NCM-3 filled polypropylene are shown in Table 4.

[0057] project

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Abstract

The invention relates to a method for preparation of predispersed master batch of polyolefin /nano-alcium carbonate, which includes: (1) adding nano-alcium carbonate into the kneading machine, afterwards, adding unsaturated acid monomer, long fatty chain monomer, initiating agent, polyethersulfonate, macromolecular coupling agent and polyolefin resin in turn, and kneading for 0.5-5 minutes; (2) discharging mixtures into the twin-screw extruder to perform squeezing, granulating and drying, then obtaining the predispersed master batch of polyolefin /nano-alcium carbonate, with a speed of host machine of twin-screw extruder of 50-600 revolutions per minute, a feeding speed of 20-400 revolutions per minute, a heating-up temperature of 80-220 DEG C; the invention is of few job steps, strong interaction between polyolefin and nano-alcium carbonate and is liable to disperse in the polymeric matrix. The said predispersed master batch of polyolefin /nano-alcium carbonate obtained by this invention can be widely used in enhancing, toughening and modifying various plastics, specially adapted for preparation of polyolefin permeability films and so on.

Description

technical field [0001] The invention relates to a preparation method of polyolefin / nanometer calcium carbonate pre-dispersed master batches which are easy to uniformly disperse in polymers. Background technique [0002] Because polyolefin raw materials are abundant, cheap, easy to process and shape, and have excellent comprehensive properties, they can be processed into tubes, plates, films, and fibers by extrusion, blow molding, and injection processes. Polymer Materials. [0003] In recent years, the application of inorganic nanopowders in polymers has received great attention. Among them, nano-calcium carbonate has become one of the most important varieties due to its mature preparation process, high output and low price. The most mature application of nano-calcium carbonate is the plastics industry, mainly used in high-grade plastic products, which can not only reduce the cost of plastic products, but also improve the rheology of plastic masterbatch and improve its for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/00C08K3/26B29C47/40
Inventor 章永化赵建青蒋文真李刚岳恒帅谢怀兴游华燕刘宝玉
Owner SOUTH CHINA UNIV OF TECH
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