Novel high-intensity high heat-resistance polypropylene modified composite material and preparation method thereof
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A composite material, polypropylene technology, applied in the field of polypropylene materials, can solve problems such as unsatisfactory improvement in tensile strength and rigidity, and achieve the effect of improving surface finish, wide application range, and improving strength and heat resistance
Inactive Publication Date: 2010-04-14
SUZHOU HESHENG NEW MATERIALS
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[0004] The purpose of the present invention is to overcome the unsatisfactory improvement of the tensile strength and rigidity of existing polypropylene modified materials, and provide a new high-strength and high-heat-resistant polypropylene modified composite material and its preparation method
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Embodiment 1
[0025] In the Mix evenly in the mixer, knead and extrude the mixture in the twin-screw extruder, add 5 parts of alkali-free glass fiber yarn from the glass fiber inlet of the extruder, and set the temperature of each section of the extruder to T 1 =170°C, T 2 =180°C, T 3 =190°C, T 4 =205°C, T 5 =210°C, T 6 = 220°C, rotating speed 350r / min, after cooling and pelletizing, polypropylene pellets mixed with calcium sulfate whiskers and glass fibers were obtained.
Embodiment 2
[0027] Mix 69.4 parts of polypropylene, 10 parts of calcium sulfate whiskers, 15 parts of polypropylene grafted maleic anhydride copolymer, 0.1 part of nucleating agent, 0.3 part of antioxidant and 0.2 part of lubricant in a mixer, and the mixture is Mixing and extrusion in the twin-screw extruder, 5 parts of glass fiber is added from the glass fiber inlet of the extruder, and the temperature of each section of the extruder is set to T 1 =170°C, T 2 =190°C, T 3 =195°C, T 4 =200°C, T 5 =205°C, T 6 = 210°C, rotating speed 300r / min, after cooling and pelletizing, polypropylene pellets mixed with calcium sulfate whiskers and glass fibers were obtained.
Embodiment 3
[0029] In the Mix evenly in the mixer, knead and extrude the mixture in the twin-screw extruder, add 25 parts of alkali-free glass fiber yarn from the glass fiber inlet of the extruder, and set the temperature of each section of the extruder to T 1 =170°C, T 2 =180°C, T 3 =190°C, T 4 =200°C, T 5 =205°C, T 6 = 220°C, the rotating speed is 300r / min, after cooling and pelletizing, polypropylene pellets mixed with calcium sulfate whiskers and glass fibers are obtained.
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Abstract
The invention relates to a novel high-intensity high heat-resistance polypropylene modified composite material and a preparation method thereof. The novel high-intensity high heat-resistance polypropylene modified composite material comprises the following components: 49-69.4 percent of polypropylene, 10-30 percent of calcium sulphate whiskers, 5-25 percent of glass fibers, 5-15 percent of maleic anhydride grafted polypropylene, 0.1-0.2 percent of nucleating agents, 0.3-0.6 percent of antioxygen and 0.2-0.5 percent of lubricating agents. The preparation method comprises the following steps: firstly uniformly mixing all the components except the glass fibers in a mixer according to the proportion; mixing the mixture in a double-screw extruder; adding the glass fibers from a fiberglass intake of the double-screw extruder; and mixing the mixture in the double-screw extruder, extruding, cooling and pelletizing. The calcium sulphate whiskers and the glass fibers are mixed to reinforce the polypropylene; in addition, with the special structure of the calcium suhphate whiskers, not only the intensity and the heat-resistance of the polypropylene modified material can be enhanced, but also the size stability and the surface finish of products can be improved, and the application field of the polypropylene modified material can be enlarged.
Description
technical field [0001] The invention relates to a polypropylene material, in particular to a novel high-strength and high-heat-resistant polypropylene modified composite material and a preparation method thereof. Background technique [0002] Glass fiber reinforced polypropylene (GF / PP) composites have replaced some engineering plastics and are widely used in industry. However, the surface of glass fiber reinforced polypropylene composite products is relatively rough, and the products are easy to warp and deform, so they are not suitable for injection molding. Parts with high appearance requirements and precise structure. Calcium sulfate (CaSO 4 ) Whisker reinforced polypropylene does not have this problem. [0003] CaSO 4 Whiskers have good dispersion and are a fibrous single crystal with an aspect ratio greater than 30. They have extremely high strength and rigidity, and the strength loss is minimal when the temperature rises. They can be used for plastic modification t...
Claims
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