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Method for improving fluidity of molten polypropylene

A polypropylene and fluidity technology, applied in the field of improving the fluidity of polypropylene melt, can solve the problems of low viscosity of resin melt, different degrees of resin degradation, and influence on fluidity, so as to reduce processing molding temperature and improve melt flow Sex, the effect of improving melt fluidity

Inactive Publication Date: 2006-04-19
ZHEJIANG KINLEAD PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to ensure the uniformity of the addition of the degradation agent, which will result in different degradation degrees of the resin, large index deviation, and a certain impact on the fluidity. Moreover, the resin melt has a low viscosity, which makes granulation difficult and difficult to control.

Method used

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  • Method for improving fluidity of molten polypropylene
  • Method for improving fluidity of molten polypropylene
  • Method for improving fluidity of molten polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 93.2064 grams of dimethyl terephthalate (DMT) and 20.4225 grams of pentaerythritol and dissolve them in N,N-dimethylformamide (DMF), add 0.0202 grams of zinc acetate as a catalyst, and react at a reaction temperature of 180°C for 15 hours. After half an hour of the reaction, methanol began to evaporate, and when no methanol evaporated, the reaction ended, and the product was precipitated in deionized water and dried. figure 1 It is the situation observed under the scanning electron microscope after the reaction product is prepared into a dilute solution and the solvent is volatilized. figure 2 is the infrared spectrum of a hyperbranched polymer, showing typical characteristics of aromatic polyesters.

Embodiment 2

[0029] The method described in example 1 prepares the end group as the hyperbranched polymer of methoxyl group, carries out blending granulation with PP in twin-screw extruder then, adopts the melt flow index that melt index meter measures as follows Table 1 shows:

[0030] Hyperbranched polymer content (%)

Embodiment 3

[0032] According to the method described in Example 1, a hyperbranched polymer whose terminal group is a methoxyl group is prepared, and after blending and granulating it with PP through a twin-screw extruder, the masterbatch is mixed with PP for injection molding. The temperature of each zone of the injection molding machine is shown in Table 2:

[0033] Hyperbranched polymer content

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Abstract

A method for increasing the flowability of fused polypropene includes such steps as reaction between polyol and tere-phthalate in organic solvent at 140-220 deg.C under action of catalyst to obtain superbranched polymer, mixing it with polypropene at 150-280 deg.C in dual-screw extruder while granulating to obtain mother particles, proportionally mixing it with polypropene, and injection moulding.

Description

technical field [0001] The invention provides a method for improving the melt fluidity of polypropylene and reducing the processing and molding temperature. After the hyperbranched polyester prepared by transesterification is blended with polypropylene, the melt fluidity of polypropylene can be improved. The method has the characteristics of simple process, energy consumption reduction, production cost reduction and the like. Background technique [0002] Polypropylene (PP) plastic has good high temperature resistance, corrosion resistance, electrical insulation, low density, low price of raw materials and abundant sources, so its production capacity and output have developed rapidly in recent years. , can be widely used in industries, automobiles, home appliances, fibers and other fields. Moreover, with the development of polypropylene in my country, its application structure will gradually approach the level of developed countries. Injection-grade polypropylene used in i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/20B29C47/40B29B9/12
Inventor 余木火蔡志浩韩克清
Owner ZHEJIANG KINLEAD PACKAGING MATERIAL