CN107383615A - A kind of modified polypropylene material and preparation method thereof - Google Patents

Abstract

The invention discloses a modified polypropylene material and a preparation method thereof. The modified polypropylene material is composed of the following components by weight: it is characterized in that it is composed of the following components by weight: polypropylene 100 parts of resin, 0.5-5 parts of modifier, 0-15 parts of compatibilizer, 0.1-0.4 parts of composite antioxidant. The modified polypropylene material of the invention has good strengthening and toughening performance, higher thermal decomposition temperature and heat deformation temperature.

Description

A kind of modified polypropylene material and preparation method thereof

technical field

The invention relates to a polymer material and a preparation method thereof, in particular to a modified polypropylene material and a preparation method thereof.

Background technique

Polypropylene is widely used in the manufacture of components such as electronic appliances, auto parts, and modern office supplies due to its good heat resistance, low water absorption, low price, and wide source. However, due to the disadvantages of low comprehensive mechanical properties and poor electrical and thermal conductivity of polypropylene, its application in some fields is limited.

At present, there are many types of modified polypropylene used in the market, which are mainly modified for a certain performance. Filling modification is to add relatively cheap non-metallic mineral powder materials or other materials to polypropylene, so as to reduce the raw material cost of products, and at the same time improve some properties of plastic materials, such as rigidity, hardness and heat resistance. Such as calcium carbonate (heavy calcium, light calcium) increments reduce costs, improve impact resistance, and improve printability; talc powder (flaky) increments reduce costs, improve rigidity and heat resistance, and improve dimensional stability; mica powder ( Flake) significantly improves rigidity and heat resistance, improves dimensional stability and high temperature creep resistance; precipitated barium sulfate (barite powder) improves the surface gloss of the product and increases the material density; carbon black is used to make conductive plastics to achieve permanent antistatic Effect, improve light aging resistance; metal powder to make conductive plastic, to achieve permanent antistatic effect; wood powder to reduce costs, beneficial to resource recycling. The above-mentioned modification methods often require a large amount of filler to modify polypropylene to obtain the modification effect, but have an adverse effect on the mechanical properties of the modified polypropylene material.

Graphene is a new type of carbon material with excellent mechanical, electrical and thermal properties. The present invention utilizes this property of graphene to melt and blend a small amount of graphene and polypropylene to obtain a modified polypropylene material with good mechanical properties, heat resistance and electrical and thermal conductivity, which meets the needs of specific application fields. application needs.

Contents of the invention

One of the purposes of the present invention is to solve the above problems, to provide a product with a simple and flexible method of use, which can meet specific application requirements, and has better mechanical properties, heat resistance, electrical and thermal conductivity, and lower production costs. , Modified polypropylene material with simple production process.

Another object of the present invention is to provide a preparation method of the above-mentioned modified polypropylene material.

The modified polypropylene material claimed in the present invention consists of the following components in parts by weight: 100 parts of polypropylene resin, 0.5 to 5 parts of modifier, 0 to 15 parts of compatibilizer, and 0.1 to 0.4 parts of composite antioxidant share.

Preferably, the polypropylene resin is bulk polymerized polypropylene powder.

The preferred modifying agent is graphene, whose specific surface area is 450-550m ² /g, particle size (D ₅₀ )<10um, and carbon mass fraction≧98.0%.

A preferred compatibilizer is maleic anhydride grafted POE.

A preferred composite antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:3.

The preparation method of modified polypropylene material of the present invention comprises the following steps:

(1) Pour the bulk polymerized polypropylene powder, modifier, compatibilizer and composite antioxidant weighed according to the formula into a mixer and mix at a low speed for 3 to 4 minutes, and discharge to obtain a mixed material;

(2) Feed the mixture obtained in step (1) into a twin-screw extruder for melt extrusion, die-cut the extruded material, cool it with water, and dry to obtain a modified polypropylene material.

The preferred temperature of each zone of the twin-screw extruder in step (2) is: T ₁ =140-150°C, T ₂ =150-160°C, T ₃ =160-170°C, T ₄ =170-180°C, T ₅ = 180-190°C, T ₆ = 190-200°C, T ₇ = 190-200°C, T ₈ = 200-205°C, T ₉ = 190-200°C, T _mode = 180-190°C.

The preferred temperature of each zone of the twin-screw extruder in step (2) is: T ₁ =150°C, T ₂ =160°C, T ₃ =170°C, T ₄ =180°C, T ₅ =190°C, T ₆ = 200°C, T ₇ =200°C, T ₈ =205°C, T ₉ =200°C, T _mode =190°C.

In the preferred step (1), the polypropylene resin, modifier, compatibilizer and composite antioxidant are weighed and poured into a mixer and mixed for 4 minutes at a low speed.

The positive effect that the present invention has:

1. The modified polypropylene material of the present invention adopts graphene with a specific surface area of 450-550m ² /g, a particle size (D ₅₀ )<10um, and a carbon mass fraction≧98.0% to have the following advantages:

(1) A good polypropylene toughening effect can be obtained at a small dosage;

(2) Effectively improve the heat distortion temperature and electrical and thermal conductivity of polypropylene with a small dosage;

(3) Increase the thermal decomposition temperature of polypropylene with a small dosage; ensure the stability of manufacturing and molding processing of modified polypropylene materials.

2. The modified polypropylene material of the present invention adopts maleic anhydride grafted POE as a compatibilizer, which ensures that graphene has a good uniform dispersion effect in the manufacture and application of the modified polypropylene material, which is conducive to improving the modified polypropylene material. Enhanced toughening and electrical and thermal conductivity of acrylic materials.

detailed description

Example 1

The modified polypropylene material of the present embodiment is made up of the following components by weight:

The polypropylene powder resin of 25kg, the graphene of 0.25kg, the composite antioxidant of 0.1kg (made up of 0.025kg antioxidant 1010 and 0.075kg antioxidant 168).

The preparation method of above-mentioned modified polypropylene material has the following steps:

(1) Pour the bulk polymerized polypropylene powder, modifier, compatibilizer and composite antioxidant weighed according to the formula into a mixer and mix at a low speed for 4 minutes, and then discharge to obtain a mixed material;

(2) Feed the mixed material into a twin-screw extruder for melt extrusion, cut the extruded strip into pellets, cool it with water, and obtain a modified polypropylene material through drying treatment.

In the above step (2), the temperature of each zone of the twin-screw extruder is: T ₁ =150°C, T ₂ =160°C, T ₃ =170°C, T ₄ =180°C, T ₅ =190°C, T ₆ = 200°C, T ₇ =200°C, T ₈ =205°C, T ₉ =200°C, T _mode =190°C.

Embodiment 2 to Embodiment 6

The preparation method of the modified polypropylene material of each example is the same as that of Example 1, the difference lies in the weight ratio of each component, see Table 1 for details.

Table 1: The formula ratio of embodiment 1～6

The modified polypropylene material obtained in Examples 1 to 6 was injected into a standard sample with an injection molding machine, and the mechanical properties of the standard sample were tested according to national standards. The test results are shown in Table 2.

Table 2: Test results of modified polypropylene materials prepared by the recipes of Examples 1 to 6

comparative example

The preparation method of the modified polypropylene material of the comparative example is the same as that of Example 3 and Example 5, the difference is that the component distribution ratio is different, and the pure polypropylene powder is used for comparison, see Table 3 for details.

Table 3: Embodiment 3, embodiment 5, comparative example prescription proportioning

Example 3 Example 5 comparative example Polypropylene Powder Resin 25kg 25kg 25 Graphene 0.625kg 0.375kg 0 Maleic anhydride grafted POE 0kg 2.5kg 0 Antioxidant 1010 0.025kg 0.025kg 0 Antioxidant 168 0.075kg 0.075kg 0

The polypropylene powder of the comparative example was injected into a standard sample by an injection molding machine, and the performance of the test was shown in Table 4 for details.

Table 4: Example 3, Example 5, the test results of the modified polypropylene material prepared by the prescription of the comparative example

As can be seen from Table 4, the present invention adopts graphene and maleic anhydride grafted POE modified polypropylene to compare with pure polypropylene, can effectively improve the comprehensive mechanical properties of polypropylene, heat distortion temperature, thermal decomposition temperature, thermal conductivity, reduce Its surface resistance and volume resistance.

Claims (10)

1. A modified polypropylene material, characterized in that the material consists of the following components by weight: 100 parts of polypropylene resin, 0.5 to 5 parts of modifier, 0 to 15 parts of compatibilizer, composite anti- 0.1 to 0.4 parts of oxygen agent. 2. The modified polypropylene material according to claim 1, wherein the polypropylene resin is bulk polymerized polypropylene powder. 3. The modified polypropylene material according to claim 1, characterized in that, the compatibilizer is maleic anhydride grafted POE. 4. The modified polypropylene material according to claim 1, wherein the composite antioxidant is composed of antioxidant 1010 and antioxidant 168. 5. The modified polypropylene material according to claim 1, wherein the composite antioxidant is composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:3. 6. The modified polypropylene material according to any one of claims 1-5, characterized in that the modifier is graphene, the specific surface area of graphene is 450-550m ² /g, and the particle size D ₅₀ <10um , Carbon mass fraction≧98.0%. 7. the preparation method of modified polypropylene material according to claim 6, is characterized in that, the method comprises the following steps: (1) Pour the polypropylene resin, modifier, compatibilizer and composite antioxidant according to the formula into the mixer and mix at a low speed for 3 to 4 minutes, and discharge to obtain the mixed material; (2) Feed the mixture obtained in step (1) into a twin-screw extruder for melt extrusion, die-cut the extruded material, cool it with water, and dry to obtain a modified polypropylene material. 8. The preparation method of modified polypropylene material according to claim 7, characterized in that, in step (2), the temperature of each zone of the twin-screw extruder is: T ₁ =140-150°C, T ₂ =150°C ~160°C, T ₃ =160~170°C, T ₄ =170~180°C, T ₅ =180~190°C, T ₆ =190~200°C, T ₇ =190~200°C, T ₈ =200~205 °C, T ₉ =190-200°C, T _mode =180-190°C. 9. The preparation method of modified polypropylene material according to claim 8, characterized in that, in step (2), the temperature of each zone of the twin-screw extruder is: T ₁ =150°C, T ₂ =160°C, T ₃ =170°C, T ₄ =180°C, T ₅ =190°C, T ₆ =200°C, T ₇ =200°C, T ₈ =205°C, T ₉ =200°C, T _mode =190°C. 10. according to the preparation method of the described modified polypropylene material of any one of claim 7～8, it is characterized in that, in step (1), weigh polypropylene resin, modifier, compatibilizer and composite antioxidant Pour into a mixer and mix at low speed for 4 minutes.