Special low-linear expansion coefficient polypropylene material for bumpers, and preparation method thereof

A linear expansion coefficient and polypropylene technology is applied in the field of low linear expansion coefficient polypropylene special materials for bumpers and the field of preparation, which can solve the problems of low notched impact strength, easy brittle cracking, poor toughness of polypropylene materials, etc. properties, improve strength and modulus, and improve toughness

Inactive Publication Date: 2019-05-21
成都市水泷头化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a car safety device, the car bumper can play a buffer role in the event of a collision, protecting the front and rear car bodies and even the personal safety of the driver. Therefore, automobile bumpers must have good mechanical properties such as strength and impact toughness, while polypropylene materials have the disadvantages of poor toughness, especially at low temperatures, which are brittle and have low notched impact strength.

Method used

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  • Special low-linear expansion coefficient polypropylene material for bumpers, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add titanate coupling agent to absolute ethanol to make a coupling agent solution, vacuum-dry the glass fiber at 75°C for 4.5h, add it to a high-speed stirrer, raise the temperature to 78°C, and then add the coupling agent solution, continue to stir for 17 minutes, discharge, and vacuum dry at 75°C for 4.5 hours to obtain modified glass fibers; the titanate coupling agent is isopropyl tris(dodecylbenzenesulfonyl) titanate; each The parts by weight of raw materials are 1.3 parts by weight of titanate coupling agent, 23 parts by weight of absolute ethanol, and 75.7 parts by weight of glass fiber; the speed of the high-speed stirrer is 1950r / min;

[0033] (2) Mix maleic anhydride grafted polypropylene with dodecanediamine, melt blend and extrude in a twin-screw extruder, pelletize, and vacuum dry at 75°C for 4.5 hours to obtain a compatibilizer The graft rate of maleic anhydride grafted polypropylene is 0.9%; The parts by weight of each raw material are, maleic anhydride...

Embodiment 2

[0038] (1) Add titanate coupling agent to absolute ethanol to make a coupling agent solution, vacuum-dry the glass fiber at 70°C for 5 hours, add it to a high-speed stirrer, raise the temperature to 75°C, and then add the coupling agent solution , continue to stir for 18 minutes, discharge, and vacuum dry at 70°C for 5 hours to obtain modified glass fibers; the titanate coupling agent is isopropyl tris(dioctyl phosphate acyloxy) titanate; each raw material The parts by weight are 1.1 parts by weight of titanate coupling agent, 21 parts by weight of absolute ethanol, and 77.9 parts by weight of glass fiber; the speed of the high-speed stirrer is 1900r / min;

[0039] (2) Mix maleic anhydride grafted polypropylene with dodecanediamine, perform melt blending and extrusion in a twin-screw extruder, pelletize, and vacuum dry at 70°C for 5 hours to obtain a compatibilizer; The graft ratio of maleic anhydride grafted polypropylene is 0.8%; The parts by weight of each raw material are, ...

Embodiment 3

[0044] (1) Add titanate coupling agent to absolute ethanol to make a coupling agent solution, vacuum-dry the glass fiber at 78°C for 4 hours, add it to a high-speed stirrer, raise the temperature to 80°C, and then add the coupling agent solution , continue to stir for 18 minutes, discharge, and vacuum dry at 78°C for 4 hours to obtain modified glass fibers; the titanate coupling agent is isopropyl tris(isostearyl) titanate; the weight parts of each raw material are , 1.4 parts by weight of titanate coupling agent, 24 parts by weight of absolute ethanol, 74.6 parts by weight of glass fiber; the rotating speed of the high-speed stirrer is 2100r / min;

[0045] (2) Mix maleic anhydride grafted polypropylene with dodecanediamine, perform melt blending and extrusion in a twin-screw extruder, pelletize, and vacuum dry at 78°C for 4 hours to obtain a compatibilizer; The graft ratio of maleic anhydride grafted polypropylene is 1%; The parts by weight of each raw material are, 88 parts b...

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Abstract

The invention relates to the technical field of modified polypropylene materials for automobiles, and provides a special low-linear expansion coefficient polypropylene material for bumpers, and a preparation method thereof. Polypropylene is toughened and modified with thermoplastic polyurethane, a compatibilizer prepared from maleic anhydride grafted polypropylene and dodecanediamine is used to improve the interfacial bonding between the polypropylene and the thermoplastic polyurethane, glass fibers are adopted to modify the polypropylene to increase the strength and reduce the linear expansion coefficient, and a titanate coupling agent is used to improve the dispersibility of the glass fibers in the polypropylene. Compared with special polypropylene materials prepared by conventional methods, the special polypropylene material prepared in the invention has the advantages of high tensile strength, high flexural modulus, high notch impact strength, significantly reduced linear expansioncoefficient, and realization of good dimensional stability of the bumpers.

Description

technical field [0001] The invention belongs to the technical field of modified polypropylene materials for automobiles, and provides a special polypropylene material with low linear expansion coefficient for bumpers and a preparation method thereof. Background technique [0002] The car bumper is a safety device that absorbs and moderates external impact and protects the front and rear of the car body. At the beginning of application, automobile bumpers were mainly made of metal materials. With the development of the automobile industry and the extensive application of engineering plastics in the automobile industry, automobile bumpers, as an important safety device, are also on the road to innovation. At present, in addition to maintaining the original protective function, the front and rear bumpers of automobiles also need to pursue harmony and unity with the shape of the car body, and pursue their own lightweight. Therefore, the current front and rear bumpers of cars ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L75/06C08L75/08C08L23/06C08L51/06C08K13/04C08K9/04C08K7/14C08K5/17C08K3/34
Inventor 蔡杰
Owner 成都市水泷头化工科技有限公司
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