CN114149651B - Low-odor, low-fiber-floating and heat-aging-resistant long glass fiber reinforced polypropylene material and preparation process thereof - Google Patents

Abstract

The invention provides a low-odor, low-floating fiber, heat-aging-resistant long glass fiber reinforced polypropylene material, including preparation raw materials: polypropylene PP: 50 to 70 parts, glass fiber: 30 to 50 parts, and functional compatibilizer: 3 to 15 parts, lubricant: 0.2 to 1 part, antioxidant: 0.7 to 1.5 parts; the glass fiber is a pretreated alkali-free continuous glass fiber with a diameter of 11-20 μm; in the preparation process, continuous The glass fiber is dispersed through the glass fiber disperser, and the rotation speed of the glass fiber disperser is 18 to 35 rpm; after the glass fiber is dispersed and baked at high temperature, it enters the impregnation die, and is extruded in the impregnation die. The incoming molten PP mixture is impregnated and coated. The low-odor, low-floating fiber, and heat-aging-resistant long glass fiber reinforced PP material prepared by the invention meets the use requirements of automotive engine accessory plastic parts. The PP reinforced material is not easy to age under long-term high temperature conditions, and the material's toughness and strength properties do not change much, making it suitable for manufacturing automotive engine accessory parts.

Description

A low-odor, low-floating fiber, heat-aging-resistant long glass fiber reinforced polypropylene material and its preparation Preparation process

Technical field

The invention belongs to the field of polypropylene PP reinforced materials, and particularly relates to a low-odor, low-floating fiber, heat-resistant aging long glass fiber reinforced PP material and its preparation process.

Background technique

Usually, polypropylene PP resin reinforcement is achieved by adding glass fiber or mineral powder. Long glass fiber reinforced PP, the glass fiber is parallel to the axis and radial direction of the pellet, and the long glass fiber has a longer length, which can play a toughening and reinforcing effect in PP. Since PP resin is reinforced with glass fiber, its strength can reach several times more than the original. The greater the strength, the higher the heat resistance, and the more stable the size. Therefore, PP reinforced materials can be used as an important material for "replacing steel with plastic" and are widely used in various mechanical components. With the continuous development of "lightweight" automobiles, long glass fiber reinforced PP materials are gradually used in ancillary parts around automobile engines, which can replace some metal parts to reduce weight and improve economic benefits. However, due to the high temperature around the engine, PP is prone to aging under long-term high temperature conditions, resulting in a decrease in material toughness and strength, making it difficult to meet the requirements for use as ancillary materials around the engine. As the glass fiber content increases, floating fibers are more likely to appear on the surface of plastic parts, affecting their appearance.

CN201510968817.2 discloses an alkali-free glass fiber reinforced modified polypropylene composite material and a preparation method thereof, wherein the alkali-free glass fiber reinforced modified polypropylene composite material includes the following mass parts of raw materials: homopolymer PP resin 45 to 55 parts; alkali-free glass fiber 28 to 32 parts; talc 13 to 17 parts; compatibilizer 4 to 6 parts; antioxidant 0.5 to 2 parts, anti-floating fiber agent 0.5 to 2 parts; lubricant 0.5 to 2 servings. This invention adds some ultra-fine talc powder to the PP glass fiber reinforced material, and uses talc powder with a smaller aspect ratio than the glass fiber. It can achieve the lubrication and dispersion effect of large particles in the formula mixture, and can make the large aspect ratio seamless. Alkali glass fibers are better evenly dispersed in the material. However, talc powder has a mediocre dispersion-assisting effect on long fibers, and the above-mentioned invention directly mixes fibers with other raw materials and melts them for extrusion, which seriously abrades the long fibers.

CN201610324096.6 discloses a low floating fiber glass fiber reinforced polypropylene material and a preparation method thereof. It is made of the following raw materials by weight: 100 parts of polypropylene resin; 15-30 parts of high melt strength polypropylene; 10 parts of glass fiber -50 parts; 1-3 parts of compatibilizer; 5-15 parts of ethylene-propylene block copolymer; 1-2 parts of other additives. The preparation method adopts screw extrusion processing. The design principle of screw combination: Zones one to two are only composed of conveying elements, zones three to seven all contain shearing elements, and zones eight to ten are composed only of conveying elements. The extrusion temperature is 165 -230℃. For the above-mentioned glass fiber reinforced PP, through the design of the screw combination during the screw extrusion process, the high melt strength polypropylene wraps the glass fiber. However, the fiber is also directly mixed with other raw materials for melting and extrusion, which causes certain wear on the long fiber, resulting in The strength of the material is reduced.

Contents of the invention

The purpose of this invention is to provide long glass fiber reinforced PP materials with low odor, low floating fiber, and heat-aging resistance. Based on the principle of material similarity and compatibility, the long glass fibers are first highly dispersed to form glass fiber filaments, and then functional compatibilizers and The lubricant is then compounded with the PP material to obtain a PP reinforced material with low floating fiber and heat aging resistance.

In order to achieve the above objects, the technical solutions provided by the present invention are as follows:

A low-odor, low-floating, heat-aging-resistant long glass fiber reinforced polypropylene material is prepared by including the following raw materials in parts by weight:

Polypropylene PP: 50 to 70 parts

Long glass fiber: 30 to 50 parts

Functional compatibilizer: 3 to 15 parts

Lubricant: 0.2~1 part

Antioxidants: 0.7 to 1.5 parts;

The glass fiber is a pre-treated alkali-free continuous glass fiber with a single filament diameter of 11-20 μm. The total covering angle of continuous glass fiber is 270°, and the tension of glass fiber is 25~30N. Usually, when the total covering angle of the fiber bundle is 270° and the fiber tension is about 25N, the glass fiber can be dispersed well without damaging the long fibers and affecting the fiber reinforcement effect; too high a total covering angle and fiber Tension can easily aggravate fiber wear and seriously affect its reinforcing effect.

In the preparation process, continuous glass fibers are dispersed through a glass fiber disperser, and the rotation speed of the glass fiber disperser is 18 to 35 rpm; after the glass fibers are dispersed, they are baked in a high-temperature cabinet and then enter the impregnation die. The extruded molten PP mixture is impregnated and coated in the impregnation die; the continuous glass fiber enters the impregnation die and is pulled by a tractor at a pulling speed of 350 to 600 rpm.

In the present invention, the long glass fibers are dispersed through the glass fiber disperser, and the continuous hard glass fibers are bundled into soft and fine glass fiber monofilaments, which are heated evenly during high-temperature baking, which is beneficial to the glass fiber in the infiltration die. It is dispersed, impregnated and coated in the extruded molten PP. In addition, the continuous glass fiber bundles are broken up into soft filaments, which can improve the strength of the composite material, prevent floating fibers, and resist aging. If the degree of dispersion is not complete, the original glass fiber bundles are large and hard, and it is difficult to be completely wetted and covered by PP, and the final manufactured parts will have serious floating fibers. The continuous glass fiber enters the infiltration die and is powered by a tractor with a speed of 350 to 600 rpm. The slower the pulling speed, the longer the continuous glass fiber stays in the infiltration die, and the better the infiltration and coating effect in the die, which is beneficial to increasing the strength of the material and reducing floating fibers. The rotation speed of the glass fiber disperser is 18-35 rpm. Each bundle of glass fibers is composed of thousands of strands of monofilament. When the glass fiber bundles are baked in a high-temperature cabinet, the bunching agent in the glass fibers is quickly removed. , when passing through the rotating disperser blades, the glass fiber bundles are dispersed through mechanical movement, and the bundled glass fibers are dispersed into soft monofilament state, which effectively improves the impregnation coating effect, increases the strength of the material, and reduces floating fibers. .

Based on the molecular structure characteristics and the principle of similar compatibility, the present invention uses a functional compatibilizer that is both pro-PP and pro-glass fiber to improve compatibility. In the present invention, preferably, the functional compatibilizer is maleic anhydride-grafted polypropylene, wherein the grafting rate of maleic anhydride-grafted polypropylene is ≥1%, and the mass fraction of maleic anhydride is 2%. Maleic anhydride-grafted polypropylene introduces polar side chain groups into the non-polar molecular main chain, which has amphiphilic properties similar to surfactants and can become polar materials and non-polar materials. Compatible composite bridges (similar to the formation of micelles) improve the wetting, winding and covering effects between PP materials and glass fibers, enhance material strength, and reduce floating fibers on the surface of injection molded parts. At the same time, due to the good grafting activity of the preferred maleic anhydride monomer, the maleic anhydride grafting rate is high, the monomer residue is low, and the odor is low.

In the present invention, preferably, the pretreatment method of the glass fiber is: a. Dip the continuous glass fiber into acrylic acid or acrylate solution for 8 to 12 hours, and the soaking temperature is 30°C to 65°C; b. After soaking, the continuous glass fiber is dried naturally and placed in an oven at 150°C for drying. Through this pretreatment method, the carboxyl group is grafted onto the glass fiber, which improves the bonding strength between the glass fiber and the matrix and obtains better comprehensive mechanical properties. Preferably, the glass fiber diameter is 16 μm.

In the present invention, preferably, the PP is a specific type of block copolymerized PP or a mixture of different types of block copolymerized PP, with a melt index greater than 70g/10min. Further preferably, the PP is a specific type of block copolymer PP with a melt index of 100g/10min. Polypropylene PP is divided into homopolymerized polypropylene (PP-H), block copolymerized polypropylene (PP-B) and random copolymerized polypropylene (PP-R). Block copolymerized PP-B has high strength and impact resistance. performance.

In the present invention, preferably, the antioxidant is one or a mixture of several of antioxidant 1010, antioxidant 1076, antioxidant 168 and antioxidant AO-412S, preferably antioxidant A mixture of 1010, antioxidant 168 and antioxidant AO-412S in a weight ratio of 2:1:4. It has long-lasting high temperature resistance, excellent heat resistance and low volatility.

In the present invention, preferably, the lubricant is one or a mixture of lubricant EBS, lubricant PETS and silicone powder. A preferred lubricant is silicone powder. The function of lubricants is to improve the lubricity of the processing process, reduce the friction between the melt and the surface of machine parts, and reduce the interface adhesion properties. It not only improves fluidity, but also acts as a melt accelerator, anti-adhesion and anti-static agent, and slippery agent. etc.

In the present invention, preferably, the low odor, low floating fiber, heat-aging resistant long glass fiber reinforced polypropylene material is prepared from the following raw materials in parts by weight:

The proportion of the above-mentioned raw materials and the high glass fiber content can significantly improve the mechanical strength, heat resistance and dimensional stability of PP. At the same time, the dosage of compatibilizer is increased, and the dosage of other ingredients is controlled to keep the odor low and reduce floating fibers.

The invention also provides a method for preparing the low-odor, low-floating, heat-aging-resistant long glass fiber reinforced polypropylene material, which includes the following steps:

S1. Weigh the PP, functional compatibilizer, lubricant, and antioxidant in proportion, and stir in a high-speed mixer for 5 to 10 minutes;

S2. Add the evenly mixed materials in S1 into the twin-screw extruder for plasticization;

S3. Use a screw extruder to press the PP mixture plasticized after S2 into a dipping die with continuous glass fibers passing through it. After traction, cooling and pelletizing, a PP reinforced material with a length of 10-14mm is made.

The usage conditions of the twin-screw extruder are as follows: the extrusion temperature and the dipping die temperature are 220-240°C, and the extruder main engine speed is 300-420 rpm.

The viscosity of PP is high when melted, and it is difficult to impregnate long glass fibers. How to improve the impregnation effect of long glass fibers and molten PP to make them fully contact and have good compatibility is a difficult problem in processing and production. The preparation process of the present invention improves the compatibility between the two through the selection of compatibilizer and the setting of process conditions for impregnation and extrusion, and at the same time, the impregnation and coating effects are very good.

Compared with the existing technology, the beneficial effects of the present invention are:

1. The low-odor, low-floating, heat-aging-resistant long glass fiber reinforced PP material prepared by the present invention meets the use requirements of automotive engine accessory plastic parts. The PP reinforced material is not easy to age under long-term high temperature conditions, and the material's toughness and strength properties do not change much, making it suitable for manufacturing automotive engine accessory parts.

2. In the present invention, the continuous glass fiber is dispersed through the glass fiber disperser, and the long glass fiber bundles are dispersed into fine single filaments. They are heated evenly during high-temperature baking, which is beneficial to extrusion in the infiltration die. The molten PP is impregnated and coated to improve the strength of the material and prevent floating fibers. The continuous glass fiber enters the infiltration die and is powered by a tractor with a speed of 350 to 600 rpm. The slower the pulling speed, the longer the continuous glass fiber stays in the infiltration die, and the better the infiltration effect in the die, which is beneficial to increasing the strength of the material and reducing floating fibers.

3. The functional compatibilizer used in the present invention is maleic anhydride-grafted polypropylene, the grafting rate of maleic anhydride is ≥1%, and the mass fraction of maleic anhydride is 2%. Maleic anhydride-grafted polypropylene significantly improves the wetting, winding and coating effects between PP materials and glass fibers, improves strength and reduces surface floating fibers. At the same time, due to the good grafting activity of the preferred maleic anhydride monomer, the maleic anhydride grafting rate is high, the monomer residue is low, and the odor is low.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to specific embodiments, but the protection scope claimed by the present invention is not limited to the embodiments.

In the following specific implementation cases, the raw materials used are all commercially available unless otherwise specified.

Among them, PP uses block copolymer PP-B, with a melt index of 100g/10min.

The diameter of the glass fiber used is 16 μm, and the pretreatment steps are as follows: a. Dip the continuous glass fiber into acrylic acid or acrylic ester solution for 10 hours, and the soaking temperature is 50°C; b. Dry the soaked continuous glass fiber naturally and place it. Dry in an oven at 150°C.

The functional compatibilizer is maleic anhydride-grafted polypropylene, in which the grafting rate of maleic anhydride is ≥1% and the mass fraction of maleic anhydride is 2%.

The lubricant is silicone powder.

The antioxidant is a mixture of antioxidant 1010, antioxidant 168 and antioxidant AO-412S in a weight ratio of 2:1:4.

Example 1

Low odor, low floating fiber, heat aging resistant long glass fiber reinforced polypropylene material, the preparation raw materials are as follows:

Polypropylene PP56Kg

Glass fiber 40Kg

Functional compatibilizer 4Kg

Lubricant 0.5Kg

Antioxidant 1.2Kg.

The preparation steps for low-odor, low-floating fiber, and heat-aging-resistant long glass fiber reinforced polypropylene materials are as follows:

S1. Weigh the PP, functional compatibilizer, lubricant, and antioxidant in proportion, and stir in a high-speed mixer for 8 minutes;

S2. Add the evenly mixed materials in S1 into the twin-screw extruder for plasticization;

S3. The glass fiber is dispersed through a glass fiber disperser, and the rotation speed of the glass fiber disperser is 28 rpm; after being dispersed, it passes through a high temperature cabinet (90-110°C, linear speed 1.0-1.5m/s, heating time About 1s) and then enter the impregnation die after baking; the glass fiber enters the impregnation die and is pulled by a traction machine, and the traction speed is 450rpm;

S4. Use the screw extruder to press the PP mixture plasticized after S2 into the impregnation die through which glass fiber passes. After traction, cooling and pelletizing, a PP reinforced material with a length of 10-14mm is made, in which The extrusion temperature and dipping die temperature are 220~240℃, and the extruder main engine speed is 420rpm.

The PP composite material of this example was tested using ISO standards, and the results are as follows in Table 1.

Table 1 Test results of Example 1

Example 2

Low odor, low floating fiber, heat aging resistant long glass fiber reinforced polypropylene material, the preparation raw materials are as follows:

Polypropylene PP66Kg

Glass fiber 30Kg

Functional compatibilizer 4Kg

Lubricant 0.5Kg

Antioxidant 1.2Kg.

The preparation steps for low-odor, low-floating fiber, and heat-aging-resistant long glass fiber reinforced polypropylene materials are as follows:

S1. Weigh the PP, functional compatibilizer, lubricant, and antioxidant in proportion, and stir in a high-speed mixer for 8 minutes;

S2. Add the evenly mixed materials in S1 into the twin-screw extruder for plasticization;

S3. The glass fibers are dispersed through a glass fiber disperser. The rotation speed of the glass fiber disperser is 28 rpm. After being dispersed, the glass fibers are dispersed in a high temperature cabinet (90-110°C, linear speed 1.0-1.5m/s, heating time 1s). left and right) after baking, it enters the impregnation die; the glass fiber enters the impregnation die and is pulled by a traction machine, and the traction speed is 500rpm;

S4. Use the screw extruder to press the PP mixture plasticized after S2 into the impregnation die through which glass fiber passes. After traction, cooling and pelletizing, a PP reinforced material with a length of 10-14mm is made, in which The extrusion temperature and dipping die temperature are 220~240℃, and the extruder main engine speed is 420rpm.

The PP composite material of this example was tested using ISO standards, and the results are as follows in Table 2.

Table 2 Test results of Example 2

Example 3

Low odor, low floating fiber, heat aging resistant long glass fiber reinforced polypropylene material, the preparation raw materials are as follows:

Polypropylene PP60Kg

Glass fiber 40Kg

Functional compatibilizer 5Kg

Lubricant 0.6Kg

Antioxidant 1.3Kg.

The preparation steps for low-odor, low-floating fiber, and heat-aging-resistant long glass fiber reinforced polypropylene materials are as follows:

S1. Weigh the PP, functional compatibilizer, lubricant, and antioxidant in proportion, and stir in a high-speed mixer for 10 minutes;

S2. Add the evenly mixed materials in S1 into the twin-screw extruder for plasticization;

S3. The glass fibers are dispersed through a glass fiber disperser. The rotation speed of the glass fiber disperser is 30 rpm. After being dispersed, the glass fibers are dispersed through high temperature (90-110°C, linear speed 1.0-1.5m/s, and heating time is about 1s). ) After baking, it enters the impregnation die; the glass fiber enters the impregnation die and is pulled by a traction machine at a traction speed of 400 rpm;

S4. Use the screw extruder to press the PP mixture plasticized after S2 into the impregnation die through which glass fiber passes. After traction, cooling and pelletizing, a PP reinforced material with a length of 10-14mm is made, in which The extrusion temperature and dipping die temperature are 220~240℃, and the extruder main engine speed is 350rpm.

The PP composite material of this embodiment was tested using ISO standards, and the results are as follows in Table 3.

Table 3 Test results of Example 3

Example 4

Low odor, low floating fiber, heat aging resistant long glass fiber reinforced polypropylene material, the preparation raw materials are as follows:

Polypropylene PP70Kg

Fiberglass 45Kg

Functional compatibilizer 5Kg

Lubricant 0.4Kg

Antioxidant 1.0Kg.

The preparation steps for low-odor, low-floating fiber, and heat-aging-resistant long glass fiber reinforced polypropylene materials are as follows:

S1. Weigh the PP, functional compatibilizer, lubricant, and antioxidant in proportion, and stir in a high-speed mixer for 9 minutes;

S2. Add the evenly mixed materials in S1 into the twin-screw extruder for plasticization;

S3. The glass fiber is dispersed through a glass fiber disperser, and the rotation speed of the glass fiber disperser is 35 rpm; after being dispersed, it is passed through a high temperature cabinet (90-110°C, linear speed 1.0-1.5m/s, heating time 1s left and right) after baking, it enters the impregnation die; the glass fiber enters the impregnation die and is pulled by a traction machine, and the traction speed is 550rpm;

S4. Use a screw extruder to press the PP mixture plasticized after S2 into a dipping die with glass fiber passing through it. After traction, cooling and pelletizing, a PP reinforced material with a length of 10-14mm is made. The extrusion temperature and dipping die temperature are 220~240℃, and the extruder main engine speed is 360rpm.

The PP composite material of this example was tested using ISO standards, and the results are as follows in Table 4.

Table 4 Test results of Example 4

Comparative example 1

The difference from Example 1 is that the extrusion temperature of the twin-screw extruder and the temperature of the impregnation die are 260-280°C, and other conditions remain unchanged. The temperature is increased here to improve the fluidity of the plastic body and produce better infiltration and coating effects.

The PP composite material of this embodiment was tested using ISO standards, and the results are as follows in Table 5.

Table 5 Test results of Comparative Example 1

The extrusion temperature of the twin-screw extruder and the impregnation die temperature of this comparative example are 260 to 280°C, and other conditions remain unchanged. Compared with Example 1, the odor intensity of this comparative example is extremely high. The reason is that the increase in temperature causes the molecular chain of polypropylene to break, the mechanical properties of the material decrease, and some volatile small molecules are produced, resulting in a heavy odor. .

Comparative example 2

Different from Example 1, the grafting rate of the compatibilizer maleic anhydride-grafted polypropylene is 0.8%. Other conditions remain unchanged. The PP composite material of this comparative example was tested using ISO standards. The results are as follows in Table 6.

Table 6 Test results of Comparative Example 2

The grafting rate of the maleic anhydride-grafted polypropylene used in this comparative example is 0.8%, and other conditions remain unchanged. Compared with Example 1, floating fibers appeared in this comparative example, the odor intensity was extremely high, the grafting rate of maleic anhydride was low, the monomer residual amount was high, and the odor was relatively large.

Comparative example 3

What is different from Example 1 is that the rotation speed of the glass fiber disperser is 5 rpm, and the glass fiber is not heated by high-temperature baking. Other conditions remain unchanged.

The PP composite material of this comparative example was tested using ISO standards. The results are as follows in Table 7.

Table 7 Test results of Comparative Example 3

The glass fiber in this comparative example is not baked at high temperature, and the speed of the disperser is reduced. The glass fiber cannot be dispersed and enters the impregnation die in bundles. The polypropylene cannot be completely infiltrated into the inside of the glass fiber, and the compatibility effect is poor. , the mechanical properties decline seriously. Parts injection molded from this material are highly likely to have floating fibers.

Comparative example 4

Different from Example 1, the amount of antioxidant added was changed from 1.2Kg to 0.4Kg. Other conditions remain unchanged.

The PP composite material of this comparative example was tested using ISO standards. The results are as follows in Table 8.

Table 8 Test results of Comparative Example 4

The amount of antioxidant added in this comparative example is low, and the mechanical properties change little. However, the mechanical properties decline seriously after long-term thermal aging.

Based on the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims (9)

1. The low-odor, low-fiber-floating and heat-aging-resistant long glass fiber reinforced polypropylene material is characterized by comprising the following raw materials in parts by weight:

50-70 parts of polypropylene PP

30-50 parts of long glass fiber

3-15 parts of functional compatilizer

0.2 to 1 part of lubricant

0.7-1.5 parts of antioxidant;

the long glass fiber is pretreated alkali-free continuous glass fiber, and the diameter of the long glass fiber is 11-20 mu m; the total coating angle of the continuous glass fiber is 270 degrees, and the fiber tension is 25-30N;

in the preparation process, continuous glass fibers are scattered by a glass fiber scattering device, and the rotating speed of the glass fiber scattering device is 18-35 rpm; after being scattered, the mixture is baked by Gao Wengui and enters an impregnating die head, and the mixture is impregnated and coated with extruded molten PP mixture in the impregnating die head; the continuous glass fiber enters into an impregnation die head and is drawn by a drawing machine, and the drawing speed is 350-600 rpm;

the temperature of the dipping die head is 220-240 ℃;

the pretreatment mode of the glass fiber is as follows:

a. immersing the continuous glass fiber into an acrylic acid or acrylic ester solution for 8-12 h at the immersion temperature of 30-65 ℃;

b. naturally airing the soaked continuous glass fiber, and putting the soaked continuous glass fiber into a baking oven at 150 ℃ for baking for later use;

the functional compatilizer is maleic anhydride grafted polypropylene (PP-g-MAH), wherein the grafting rate of the maleic anhydride grafted polypropylene is more than or equal to 1%, and the mass fraction of the maleic anhydride is 2%.

2. The low odor, low fiber float, heat aging resistant long glass fiber reinforced polypropylene material of claim 1, wherein said PP is a block copolymerized PP of a specific type or a mixture of block copolymerized PP of different types, and has a melt index greater than 70g/10min.

3. The low odor, low fiber float, heat aging resistant long glass fiber reinforced polypropylene material of claim 1, wherein said PP is a block copolymerized PP of a specific type having a melt index of 100g/10min.

4. The low odor, low fiber float, heat aging resistant long glass fiber reinforced polypropylene material of claim 1, wherein said antioxidant is one or a mixture of several of antioxidant 1010, antioxidant 1076, antioxidant 168 and antioxidant AO-412S.

5. The low odor, low fiber float, heat aging resistant long glass fiber reinforced polypropylene material according to claim 4, wherein the antioxidant is a mixture of antioxidant 1010, antioxidant 168 and antioxidant AO-412S in a weight ratio of 2:1:4.

6. The low odor, low fiber float, heat aging resistant long glass fiber reinforced polypropylene material of claim 1, wherein said lubricant is one or a mixture of several of lubricant EBS, lubricant PETS and silicone powder.

7. The low-odor, low-fiber-float and heat-aging-resistant long glass fiber reinforced polypropylene composite material according to claim 1, which is characterized by comprising the following raw materials in parts by weight:

polypropylene PP56 parts

40 parts of glass fiber

4 parts of functional compatilizer

0.5 part of lubricant

1.2 parts of antioxidant.

8. The method for preparing the low-odor, low-fiber-float and heat-aging-resistant long glass fiber reinforced polypropylene material according to any one of claims 1 to 7, which is characterized by comprising the following steps:

s1, respectively weighing polypropylene PP, a functional compatilizer, a lubricant and an antioxidant according to a proportion, and stirring in a high-speed stirrer for 2-10 minutes;

s2, adding the uniformly mixed materials in the S1 into a double-screw extruder for plasticizing;

s3, pressing the PP mixture plasticized after S2 into an impregnation die head through which continuous glass fibers pass by using a screw extruder, and pulling

And (5) carrying out guiding, cooling and granulating treatment to prepare the PP reinforcing material with the length of 10-14 mm.

9. The method for preparing the low-odor, low-fiber-floating and heat-aging-resistant long glass fiber reinforced polypropylene material according to claim 8, wherein the twin-screw extruder is used under the following conditions: the extrusion temperature is 220-240 ℃, and the host rotation speed of the extruder is 300-420 rpm.