Low-odor easy-to-demould polypropylene composite material for automobiles and preparation method thereof

Abstract

The invention provides a low-odor and easy-to-demould polypropylene material for automobiles and a preparation method thereof, and belongs to the technical field of high polymer materials. The polypropylene material comprises the following components in parts by weight: 60-80 parts of polypropylene, 0-8 parts of an ethylene-octylene copolymer (POE), 16-25 parts of talcum powder, 1-2 parts of a deodorant, 1-2 parts of a coupling agent, 0.1-0.2 part of an antioxidant, 0.2-0.4 part of a dispersing agent, 0.3 part of a heat stabilizer and 0.2-0.5 part of a release agent, and behenamide (Hubeheng Xing Constant Industry 3061-75-4) is selected as the release agent. Through model selection of the specific release agent and synergistic cooperation of all the components, on the basis that the mechanical property of the material is guaranteed, the double advantages of low odor and easy demolding are achieved, the problems that a traditional release agent is easy to decompose, the odor exceeds the standard and demolding is poor are effectively solved, and the release agent is suitable for production of automobile interior trim parts of complex structures; the preparation method is simple in process, easy in parameter control and convenient for industrial popularization.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a low-odor, easy-to-demold polypropylene composite material for automotive interior parts and its preparation method. Background Technology

[0002] Polypropylene (PP) is widely used in automotive interior parts due to its low density, good heat resistance, excellent chemical stability, and relatively low cost. However, automotive interior structures are complex and diverse. If different parts are made of different polypropylene materials, it will significantly increase warehousing and production changeover costs. If the same material is used to produce interior parts with different structures, production defects such as whitening and mold pulling are likely to occur due to insufficient demolding performance, affecting the product qualification rate.

[0003] In the existing technology, erucamide is often used as a mold release agent for polypropylene materials used in automobiles. However, the initial decomposition temperature of erucamide is about 200℃, while the processing temperature range of polypropylene is 180-230℃. During the processing, erucamide is easy to decompose and produce small molecule volatiles, which not only leads to an increase in the odor level of the material and an increase in the release of VOCs (volatile organic compounds), but also reduces the mold release effect and has an adverse effect on the physical and mechanical properties of the material.

[0004] Furthermore, current research on low-odor polypropylene materials largely focuses on controlling odor by adding deodorizing agents and adsorbents, failing to achieve synergistic optimization of demolding performance and odor control. This makes it difficult to meet the comprehensive requirements of automotive interior parts for low odor, easy demolding, and stable mechanical properties. Therefore, developing a polypropylene material for automotive applications that combines low odor, easy demolding, and stable mechanical properties has significant practical application value. Summary of the Invention

[0005] The purpose of this invention is to provide a low-odor, easy-to-demold polypropylene material for automobiles, which can significantly improve demolding performance while ensuring the material's mechanical properties and low-odor characteristics, and is suitable for complex automotive interior parts.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned polypropylene material.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A low-odor, easy-to-demold polypropylene composite material for automotive applications, comprising the following components in parts by weight:

[0009] Polypropylene: 60-80 parts;

[0010] Ethylene-octene copolymer (POE): 0-8 parts;

[0011] Talc powder: 16-25 parts;

[0012] Odor remover: 1-2 parts;

[0013] Antioxidant: 0.1-0.2 parts;

[0014] Dispersant: 0.2-0.4 parts;

[0015] Heat stabilizer: 0.3 parts;

[0016] Release agent: 0.2-0.5 parts;

[0017] The release agent is behenicolamide (Hubei Xinghengye 3061-75-4).

[0018] The deodorizing agent is either a physical adsorption type or a chemical reaction type deodorizing agent.

[0019] This invention also provides a method for preparing the polypropylene material, comprising the following steps:

[0020] (1) Add polypropylene, POE and coupling agent to a batch mixing tank and mix for 10 minutes;

[0021] (2) Add talc, antioxidant, deodorizer, dispersant, heat stabilizer and release agent, and continue mixing for 20 minutes;

[0022] (3) Add the mixture to a twin-screw extruder for melt extrusion. The temperature of each section of the extruder is set as follows: Section 1 180-195℃, Section 2 190-200℃, Sections 3 to 7 200-215℃, and the die head 200-210℃.

[0023] (4) The extruded strip is cooled with water and then cut into pellets to obtain polypropylene composite material.

[0024] This invention achieves the dual advantages of low odor and easy demolding while ensuring the mechanical properties of the material through the selection of specific release agents and the synergistic combination of various components. It effectively solves the problems of easy decomposition, excessive odor, and poor demolding of traditional release agents, and is suitable for the production of complex automotive interior parts. Its preparation method is simple and the parameters are easy to control, which facilitates industrial promotion. Detailed Implementation

[0025] The present invention will be further illustrated by the following embodiments, but the present invention is not limited to the following embodiments.

[0026] The formulations for Examples 1-5 are shown in the table below (unit: parts by weight):

[0027]

[0028]

[0029] Test results:

[0030] Example 1 (without release agent): Odor level 3, poor release effect, severe whitening and mold pulling;

[0031] Examples 2 and 3 (using the old release agent erucamide): Odor level 4 or 3, release effect is average, whitening at the top exists;

[0032] Examples 4 and 5 (using the new release agent behenamide): Odor level 3 or 2, good release effect, normal parts.

[0033] This invention uses behenamide as a release agent and combines it with the synergistic effect of deodorizing agents to significantly improve the release effect while ensuring the low odor performance of the material, making it suitable for the production of complex automotive interior parts.

Claims

1. A low-odor, easy-to-demold polypropylene composite material for automotive applications, characterized in that, The polypropylene composite material comprises the following components by weight parts: Polypropylene: 60-80 parts; Ethylene-octene copolymer (POE): 0-8 parts; Talc: 16-25 parts; Odor removal agent: 1-2 parts; Antioxidant: 0.1-0.2 parts; Dispersant: 0.2-0.4 parts; Thermal stabilizer: 0.3 parts; Release agent: 0.2-0.5 parts.

2. A low odor, easy-to-release polypropylene composite material for automobiles according to claim 1, characterized in that: The release agent is behenic acid amide.

3. A low odor, easy-to-release polypropylene composite material for automobiles according to claim 2, characterized in that: The release agent is Hubei Xinghengye 3061-75-4.

4. A low odor, easy-to-release polypropylene composite material for automobiles according to claim 1, characterized in that: The odor removal agent is a physical adsorption type or a chemical reaction type odor removal agent.

5. The process for the production of a low odor, easy-to-release polypropylene composite material for automotive applications according to any one of claims 1 to 4, characterized in that, The method comprises the following steps: (1) Put the polypropylene, POE and coupling agent into a batch mixing tank and mix for 10 minutes; (2) Add talc, antioxidant, odor removal agent, dispersant, thermal stabilizer and release agent and continue mixing for 20 minutes; (3) Put the mixed materials into a twin-screw extruder for melt extrusion, and set the temperature of each section of the extruder as follows: 180-195℃ for the first section, 190-200℃ for the second section, 200-215℃ for the third to seventh sections, and 200-210℃ for the die head; (4) After water cooling, the extruded strip is cut into particles to obtain the polypropylene composite material.

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