High-heat-resistance glass fiber reinforced polypropylene material and preparation method thereof

Abstract

The invention discloses a preparation method of a high-heat-resistance glass fiber reinforced polypropylene material. The preparation method comprises the following steps: uniformly mixing a hindered phenol antioxidant and a phosphine salt to obtain a heat-resistant auxiliary agent; the preparation method comprises the following steps: adding PP, chopped glass fibers, a heat-resistant auxiliary agent and thioester into a mixer, fully mixing, extruding by using a same screw extruder at the extrusion temperature of 210 + / -2 DEG C, and drying in a hot air environment of 100 + / -2 DEG C for 1-2 hours to obtain the high-heat-resistant glass fiber reinforced polypropylene material. The preparation method is simple, the raw materials are easy to obtain, the cost is low, the obtained high-heat-resistance glass fiber reinforced polypropylene material has the excellent performance of traditional PP-GF30, the heat resistance is remarkably improved, and the high-heat-resistance glass fiber reinforced polypropylene material can be suitable for high-temperature-resistant components including engine covers.

Description

Technical Field

[0001] The invention belongs to the technical field of development of new plastic materials, and in particular relates to a high heat-resistant glass fiber reinforced polypropylene material for an engine hood and a preparation method thereof. Background Art

[0002] The engine hood is the cover on the car engine, which mainly plays the role of heat insulation, sound insulation, dust prevention and aesthetics. The traditional engine hood is made of PA6 / GF30 as raw material. The hood made of this material has problems such as poor precision and low stability due to easy deformation due to moisture. Although there are technical attempts to overcome these problems by changing the raw material composition or post-processing, the effect is not ideal, and it also further increases the manufacturing cost of the raw materials.

[0003] Therefore, in order to solve the shortcomings of PA6 / GF30, PP-GF30 is commonly used in the prior art to replace it. However, PP-GF30 itself has the problem of insufficient heat resistance. When the engine is overheated, the engine cover made of PP-GF30 will still have problems such as overheating deformation or even melting and burning. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies of the prior art, an object of the present invention is to provide a high heat-resistant glass fiber reinforced polypropylene material for an engine hood and a preparation method thereof.

[0005] The present invention is achieved by providing a high heat-resistant glass fiber reinforced polypropylene material, which comprises the following components by mass: 65 to 75 parts of PP, 25 to 35 parts of chopped glass fibers (chopped glass fibers), 0.3 to 0.5 parts of a heat-resistant additive and 0.1 to 0.2 parts of a thioester.

[0006] Preferably, the material comprises the following components in parts by mass: 70 parts of PP, 30 parts of chopped glass fibers, 0.3 parts of heat-resistant additives and 0.2 parts of thioester.

[0007] Preferably, the heat-resistant auxiliary agent is composed of a mixture of a hindered phenol antioxidant and a phosphonic salt; wherein the mass ratio of the hindered phenol antioxidant to the phosphonic salt is 2-5:2-3.

[0008] Preferably, the hindered phenol antioxidant is selected from any one of hindered phenol antioxidant 1010, hindered phenol antioxidant 1076, hindered phenol antioxidant 1098 and hindered phenol antioxidant 1024.

[0009] Preferably, the phosphonium salt is selected from ethyltriphenylphosphonium bromide or triphenylphosphonium bromide.

[0010] Preferably, the thioester is selected from dilauryl thiodipropionate or octadecyl thiodipropionate.

[0011] The present invention further discloses a method for preparing the above-mentioned high heat-resistant glass fiber reinforced polypropylene material, which comprises the following steps:

[0012] (1) mixing a hindered phenol antioxidant and a phosphonium salt uniformly to obtain a heat-resistant additive;

[0013] (2) PP, chopped glass fiber, heat-resistant additive and thioester are added into a mixer and mixed thoroughly, extruded through a screw extruder at an extrusion temperature of 210±2°C, and dried in a hot air environment at 100±2°C for 1 to 2 hours to obtain a high heat-resistant glass fiber reinforced polypropylene material.

[0014] Compared with the shortcomings and deficiencies of the prior art, the present invention has the following beneficial effects: the preparation method of the present invention is simple, the raw materials are easily available, and the cost is low. The obtained high heat-resistant glass fiber reinforced polypropylene material not only has the excellent performance of traditional PP-GF30, but also has significantly improved heat resistance, and can be suitable for high-temperature resistant parts including engine hoods. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Unless otherwise specified, the materials involved in the following embodiments can be purchased from the public domain on the market.

[0016] Example 1

[0017] (1) 0.4 kg of hindered phenol antioxidant 1010 and 0.2 kg of ethyl triphenylphosphonium bromide were mixed to obtain a heat-resistant additive;

[0018] (2) 1.75 kg PP, 0.72 kg short glass fiber, 0.075 kg heat-resistant additive and 0.05 kg dilauryl thiodipropionate were added into a mixer and mixed thoroughly, extruded through a screw extruder (210±2° C.), and dried in a hot air environment at 100±2° C. for 1 to 2 h to obtain a high heat-resistant glass fiber reinforced polypropylene material 1.

[0019] Example 2

[0020] (1) 0.2 kg of hindered phenol antioxidant 1076 and 0.3 kg of triphenylphosphonium bromide were mixed to obtain a heat-resistant additive;

[0021] (2) 1.6 kg PP, 0.88 kg short glass fiber, 0.075 kg heat-resistant additive and 0.04 kg thiodipropionate octadecyl alcohol ester were added into a mixer and mixed thoroughly, extruded through a screw extruder (210±2°C), and dried in a hot air environment at 100±2°C for 2 h to obtain a high heat-resistant glass fiber reinforced polypropylene material 2.

[0022] Example 3

[0023] (1) 0.5 kg of hindered phenol antioxidant 1098 and 0.2 kg of triphenylphosphonium bromide were mixed to obtain a heat-resistant additive;

[0024] (2) 1.75 kg PP, 0.64 kg short glass fiber, 0.12 kg heat-resistant additive and 0.025 kg thiodipropionate octadecyl alcohol ester were added into a mixer and mixed thoroughly, extruded through a screw extruder (210±2°C), and dried in a hot air environment at 100±2°C for 1 hour to obtain a high heat-resistant glass fiber reinforced polypropylene material 3.

[0025] Example 4

[0026] (1) 0.3 kg of hindered phenol antioxidant 1024 and 0.2 kg of triphenylphosphonium bromide were mixed to obtain a heat-resistant additive;

[0027] (2) 1.62 kg PP, 0.62 kg chopped glass fiber, 0.075 kg heat-resistant additive and 0.04 kg dilauryl thiodipropionate were added into a mixer and mixed thoroughly, extruded through a screw extruder (210±2°C), and dried in a hot air environment at 100±2°C for 2 h to obtain a high heat-resistant glass fiber reinforced polypropylene material 4.

[0028] Comparative Example 1

[0029] 1.75 kg PP, 0.75 kg chopped glass fiber, 0.075 kg hindered phenol antioxidant 1010 and 0.05 kg dilauryl thiodipropionate were added into a mixer and mixed thoroughly, extruded through a screw extruder (210±2° C.), and dried in a hot air environment at 100±2° C. for 1 h to obtain comparative composite material 1.

[0030] Comparative Example 2

[0031] (1) 0.4 kg of hindered phenol antioxidant 1010 and 0.2 kg of ethyl triphenylphosphonium bromide were mixed to obtain a heat-resistant additive;

[0032] (2) 1.75 kg PP, 0.75 kg chopped glass fiber, and 0.075 kg heat-resistant additive were added into a mixer and mixed thoroughly. The mixture was extruded through a screw extruder (210 ± 2 °C) and dried in a hot air environment at 100 ± 2 °C for 1 h to obtain a comparative composite material 2.

[0033] Comparative Example 3

[0034] 1.75 kg PP and 0.75 kg chopped glass fiber were added into a mixer and mixed thoroughly, extruded through a screw extruder (210±2° C.), and dried in a hot air environment at 100±2° C. for 1 h to obtain comparative composite material 3.

[0035] Effect Example

[0036] The high heat-resistant glass fiber reinforced polypropylene materials 1 to 4 (hereinafter referred to as modified materials 1 to 4) prepared in Examples 1 to 4 and the comparative composite materials 1 to 3 (hereinafter referred to as comparative materials 1 to 3) prepared in Comparative Examples 1 to 3 were selected for the following tests. Among them, the heat resistance was measured using GBT1035-1970, the tensile strength was measured using GB / T 1040.2-2006, the flexural strength was measured using GB / T 9341-2008, the cantilever beam impact strength was measured using GB / T 1843-2008, the flexural modulus was measured using GB / T 9341-2008, the melt index was measured using GB / T 3682-2000, and the shrinkage rate was measured using GB / T14233.2-2005.

[0037] The measurement results are shown in Table 1 below:

[0038] Table 1 Measurement results

[0039]

[0040]

[0041] In Table 1 above, the comparative composite material 3 is essentially a traditional PP-GF30 material, and its heat resistance is not outstanding. As can be seen from Table 1 above, compared with the comparative composite material 3, in addition to the shrinkage rate, the tensile strength, bending strength and other properties of the high heat-resistant glass fiber reinforced polypropylene materials 1 to 4 have been improved to varying degrees. The most significant improvement is that the heat resistance of the high heat-resistant glass fiber reinforced polypropylene materials 1 to 4 has reached 150℃ / 1000H. Compared with the high heat-resistant glass fiber reinforced polypropylene materials 1 to 4, the tensile strength, bending strength and other properties of the comparative composite materials 1 to 2 have decreased to a certain extent, and the most obvious decrease is in the heat resistance. This shows that for the comparative composite material 1, the addition of hindered phenolic antioxidants as heat resistance alone cannot really improve the heat resistance of the material. The heat-resistant additives composed of hindered phenolic antioxidants and phosphonic salts play an important synergistic role in the modification of PP-GF30 materials. For comparative composite material 2, thioester also plays a role of synergistic modification with the heat-resistant additive. Compared with ordinary oxidants, thioester has a stronger ability and higher efficiency in capturing free radicals, and can effectively prevent the reaction activity of functional groups in the material. Therefore, in the absence of thioester, the heat resistance of comparative composite material 2 has not been improved at all.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high heat-resistant glass fiber reinforced polypropylene material, characterized in that: The material comprises the following components in parts by mass: 65 to 75 parts of PP, 25 to 35 parts of chopped glass fibers, 0.3 to 0.5 parts of a heat-resistant additive and 0.1 to 0.5 parts of a thioester.

2. The high heat-resistant glass fiber reinforced polypropylene material according to claim 1, characterized in that: The material includes the following components in parts by mass: 70 parts of PP, 30 parts of chopped glass fibers, 0.3 parts of a heat-resistant additive, and 0.2 parts of a thioester.

3. The high heat-resistant glass fiber reinforced polypropylene material according to claim 1, characterized in that: The heat-resistant auxiliary agent is composed of a mixture of a hindered phenol antioxidant and a phosphonic salt; wherein the mass ratio of the hindered phenol antioxidant to the phosphonic salt is 2-5:2-3.

4. The high heat-resistant glass fiber reinforced polypropylene material according to claim 3, characterized in that: The hindered phenol antioxidant is selected from any one of hindered phenol antioxidant 1010, hindered phenol antioxidant 1076, hindered phenol antioxidant 1098 and hindered phenol antioxidant 1024.

5. The high heat-resistant glass fiber reinforced polypropylene material according to claim 3, characterized in that: The phosphonium salt is selected from ethyltriphenylphosphonium bromide or triphenylphosphonium bromide.

6. The high heat-resistant glass fiber reinforced polypropylene material according to claim 1, characterized in that: The thioester is selected from dilauryl thiodipropionate or octadecyl thiodipropionate.

7. The method for preparing the high heat-resistant glass fiber reinforced polypropylene material according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: (1) mixing a hindered phenol antioxidant and a phosphonium salt uniformly to obtain a heat-resistant additive; (2) PP, chopped glass fiber, heat-resistant additive and thioester are added into a mixer and mixed thoroughly, extruded through a screw extruder at an extrusion temperature of 210±2°C, and dried in a hot air environment at 100±2°C for 1 to 2 hours to obtain a high heat-resistant glass fiber reinforced polypropylene material.

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