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Polypropylene modified material with excellent stiffness and high elongation at break and preparation method of polypropylene modified material

A modified material, polypropylene technology, applied in the field of polypropylene modified materials and their preparation, can solve the problem of decreased elongation at break, decreased flexural modulus and tensile modulus of polypropylene rigidity, and rigidity of polypropylene modified materials. Can not meet the use requirements and other problems, to achieve the effect of improving the elongation at break, promoting dispersion, and being suitable for large-scale production

Active Publication Date: 2019-02-22
NINGBO ECOT SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent CN106995558A prepared a polypropylene modified material with high rigidity and good heat resistance by adding mica and calcium carbonate to polypropylene. Although the rigidity of the polypropylene modified material prepared by this method was improved, the elongation at break was obvious decline
[0003] At present, polypropylene can increase its elongation at break while improving impact strength by adding elastomers such as SBS, SEBS, EPDM, POE, and PU, but the addition of elastomers will lead to rigidity of polypropylene (such as flexural modulus and tensile strength). modulus, etc.) drop
Invention patent CN106349571A increases the impact strength and elongation at break of polypropylene by adding hydroxyl-terminated polybutadiene and ethylene-octene copolymer to polypropylene, but the rigidity of the modified polypropylene material prepared by this method cannot meet the requirements of use. Require

Method used

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  • Polypropylene modified material with excellent stiffness and high elongation at break and preparation method of polypropylene modified material
  • Polypropylene modified material with excellent stiffness and high elongation at break and preparation method of polypropylene modified material
  • Polypropylene modified material with excellent stiffness and high elongation at break and preparation method of polypropylene modified material

Examples

Experimental program
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preparation example Construction

[0045] The preparation method of the polypropylene modified material having both good rigidity and elongation at break of the present invention comprises the following steps:

[0046] (1) Mixing of reagents and raw materials: first put polypropylene and hyperbranched resin into the mixer, stir for 3-5 minutes, then add antioxidant and antistatic agent for subsequent mixing, continue mixing for 2 minutes, and finally obtain mixed raw materials;

[0047] (2) Heated extrusion: Add the mixed raw materials into the main feeding bin of the twin-screw extruder, add the inorganic filler into the side feeding bin, and add the components of the main feeding bin and side feeding bin into the twin-screw extruder according to the proportion. In the extrusion machine, the feeding speed is kept uniform and smooth to ensure that there is no blockage during the extrusion process. During the twin-screw extrusion process, the temperature of the melting section is 190-210 °C, the temperature of th...

Embodiment 1-3 and comparative example 1-3

[0070] According to the composition of each component in Examples 1-3 and Comparative Examples 1-3 in Table 3, polypropylene modified materials were prepared according to the above preparation method and their properties were tested.

[0071] Table 3 embodiment and comparative example formula (weight fraction %)

[0072]

[0073] The properties of the modified polypropylene materials prepared in Examples 1-3 and Comparative Examples 1-3 are shown in Table 4.

Embodiment 1

[0076] The difference between embodiment 1 and comparative example 1 is that comparative example 1 does not add hyperbranched resin, and the melt index, elongation at break and notched Izod impact strength of embodiment 1 are all obviously better than comparative example 1, tensile strength and tensile strength The modulus of elongation increases slightly, indicating that the modified polypropylene material prepared by this patent can not only increase the fluidity of the modified polypropylene material, but also greatly increase the elongation at break and impact performance of the modified polypropylene material. The difference between Example 2 and Comparative Example 2 is that Comparative Example 2 only uses homopolymerized PP, resulting in that the notched Izod impact strength is too low, and the toughness of the polypropylene modified material is too poor. Combining Example 2 and Comparative Example 2 shows that the combination of homopolypropylene and high-impact copolym...

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Abstract

The invention discloses a polypropylene modified material with excellent stiffness and high elongation at break and a preparation method of the polypropylene modified material. The polypropylene modified material comprises the following components: 5-95% of polypropylene, 5-60% of an inorganic filler, 0.1-3% of a hyperbranched resin, 0.1-0.8% of antioxidant and 0.1-1.0% of an antistatic agent. According to introduction of the hyperbranched resin, the elongation at break of the polypropylene modified material is greatly improved, the condition that the flexural modulus and tensile modulus of the polypropylene modified material are reduced is avoided, and the hyperbranched resin is capable of promoting dispersion of the inorganic filler in polypropylene, so that the various mechanical properties of the polypropylene modified material are improved. Furthermore, the introduced hyperbranched resin is capable of improving the melt fluidity of the polypropylene material, the production energyconsumption of the polypropylene modified material is reduced, and the polypropylene modified material is suitable for large-scale production.

Description

technical field [0001] The invention relates to a polypropylene modified material with good rigidity and high elongation at break and a preparation method thereof, which is applied in the fields of automobiles, household appliances and other polypropylene modified materials. Background technique [0002] Polypropylene is widely used in the field of automobiles, household appliances and daily necessities due to its advantages of non-toxicity, low density, high strength, wide sources, and low price. However, polypropylene also has shortcomings, such as: insufficient rigidity, thermal deformation Low temperature, high shrinkage rate of finished products, poor dimensional stability, etc. Therefore, in order to broaden the application field of polypropylene, glass fiber, talcum powder, mica, wollastonite, montmorillonite and other fillers are usually added to polypropylene to make up for the shortage of polypropylene. Invention patent CN106995558A prepared a polypropylene modifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L87/00C08K13/02C08K13/04C08K3/34C08K7/14
CPCC08K2201/003C08K2201/004C08L23/12C08L23/14C08L2205/03C08L87/00C08K13/02C08K3/34C08K13/04C08K7/14
Inventor 于翔徐茜丁宁王非王延伟卢晓龙孙志恒王晨宇
Owner NINGBO ECOT SCI & TECH
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