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Halogen-free hyperbranched polymer and modified polypropylene containing same

A technology of hyperbranched polymer and polypropylene, applied in the field of polypropylene modified materials, can solve the problems of dependence on imports and large gaps in polypropylene plastics, and achieve the effects of reducing energy consumption, improving the appearance of products, and reducing production costs

Inactive Publication Date: 2015-07-29
CHANGZHOU SITEEN AUTOMOTIVE TRIM SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the polypropylene plastics produced in my country are general-purpose grades, and there is a large gap for injection-molded high-flow polypropylene plastics, most of which rely on imports

Method used

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  • Halogen-free hyperbranched polymer and modified polypropylene containing same
  • Halogen-free hyperbranched polymer and modified polypropylene containing same
  • Halogen-free hyperbranched polymer and modified polypropylene containing same

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preparation example Construction

[0032] The preparation method of modified polypropylene can be any method known in the art. For example, the modified polypropylene of the present invention can be prepared by mechanically mixing the various components. Specifically, commonly used mixers such as kneaders, single-screw extruders, twin-screw extruders, multi-screw extruders, and the like can be used. Preferably, a modified polypropylene containing a halogen-free hyperbranched polymer is obtained by blending and granulating in a twin-screw extruder at 150-280°C, and the weight ratio of the halogen-free hyperbranched polymer to polypropylene is (0.1 ~20): 100, preferably, the weight ratio is (1~4): 100. .

[0033] The modified polypropylene prepared above can be processed into extrusion molding, blow molding, injection molding or sheet molding. Although not intended to be limiting, injection molding is preferred.

[0034]The modified polypropylene of the present invention can further add any commercially avail...

Embodiment 1

[0035] Embodiment 1, synthesize hyperbranched polymer and carry out end group modification preparation required halogen-free hyperbranched polymer:

[0036] First exhaust the air in the reaction system, pass inert gas, add the initiator halogenated ester or hydrocarbon and solvent into the reaction device according to the amount, and then put the catalyst, vinyl monomer, reducing agent and ligand into the reaction in sequence Kettle, stirring the reaction at 65°C for 11h, using 1 H-NMR nuclear magnetic resonance detects the conversion rate of the double bond, and the conversion rate reaches more than 80%, which is the end point of the reaction. Then add thiol compound, react at 30-40° C. for 15 hours, add peroxide to remove excess thiol compound, and obtain halogen-free hyperbranched polymer after precipitation.

[0037] According to the above method, each component listed in the following table and its dosage (the values ​​in the table are parts by weight) were weighed and m...

Embodiment 2

[0057] Example 2, preparing modified polypropylene containing halogen-free hyperbranched polymer by blending and extruding and performing injection molding processing:

[0058] The above-mentioned halogen-free hyperbranched polymer and polypropylene are blended and granulated through a twin-screw extruder according to the ratio in the table below to obtain modified polypropylene. 220~235℃, 215~220℃ in the fourth zone. After the modified polypropylene is injection-molded into a test sample, the sample test is placed in the sample room for 24 hours. The temperature of the sample room is kept at 23°C and the relative humidity is at 50%.

[0059]

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Abstract

The invention relates to a halogen-free hyperbranched polymer and modified polypropylene containing the same, applies to the fields of the automobile industry, the household appliance industry and other fields involving modified polypropylene materials. The halogen-free hyperbranched polymer is prepared with the preparation method comprising the following steps: an initiator halogen ester or hydrocarbon as well as a solvent is added to a reaction device under the condition of an inert gas, then a catalyst, a vinyl monomer, a reducing agent and a ligand are put into the device sequentially, and a thiol compound is added when a reaction endpoint is reached to modify an end group of the hyperbranched polymer to obtain the halogen-free hyperbranched polymer, wherein the thiol compound adopts methanethiol, ethanethiol, butyl mercaptan, 1-dodecanethiol, isooctyl thiol or tert-dodecylthiol. The halogen-free hyperbranched polymer and the modified polypropylene containing the same have the benefits as follows: the halogen-free hyperbranched polymer is taken as a flow modifier for polypropylene, the liquidity of polypropylene can be improved under the condition that the molecular weight and molecular weight distribution of polypropylene are not changed, the appearance of a product can be improved, energy consumption can be reduced, and the production cost can be reduced.

Description

technical field [0001] The invention relates to a halogen-free hyperbranched polymer and a modified polypropylene containing the polymer, which are applied in the automobile industry, the home appliance industry, and other fields involving polypropylene modified materials. Background technique [0002] Hyperbranched polymers refer to polymers that have no obvious main chain in the molecule and have abundant branched structures and surface functional groups. Because of their approximately spherical three-dimensional molecular structure, there are few intermolecular and intramolecular chain entanglements, solutions and melts Low viscosity. Therefore, it has broad application prospects in high-solid coatings, drug and catalyst carriers, rubber and plastic processing aids, etc. The synthesis methods of hyperbranched polymers mainly include polycondensation synthesis and self-condensation vinyl polymerization. [0003] Hyperbranched polymers synthesized by polycondensation reac...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08G81/02
Inventor 李丹石建新俞纪龙
Owner CHANGZHOU SITEEN AUTOMOTIVE TRIM SYST
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