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Low-crystalline-degree polypropylene composition and preparation method thereof
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A polypropylene composition, low crystallinity technology, applied in the field of modified materials, can solve the problems of limited application field, poor dimensional stability, low crystallinity, etc., and achieve the effect of widening the application field, good dimensional stability, and reducing density
Pending Publication Date: 2018-07-27
HEFEI GENIUS NEW MATERIALS
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Problems solved by technology
[0003] Although polypropylene and polypropylene alloy materials are widely used in many fields, their crystallinity is about 55%-75%, and their dimensional stability is poor. After modification, there are often problems such as large dimensional fluctuations, serious deformation, and sink marks. , thus limiting its field of application
[0004] Patent No. CN102329453A discloses a polypropylene composite material with low crystallinity. Modified additives and a large amount of fillers are used to reduce the crystallinity. However, the product has a high density and the resulting parts are heavy, which affects the lightweight of the product.
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Embodiment 1
[0022] Take the raw materials by weighing the components and proportioning ratio (parts by weight) in Table 1
[0023] The raw materials were mixed in a high-speed mixer for 5 minutes and mixed evenly, and the mixed blend was extruded and granulated through a twin-screw extruder to obtain a composition. The temperature of each zone of the extruder from the feeding section to the head temperature was 150°C, 170°C, 175°C, 175°C, 175°C, 180°C, 180°C, 180°C, 180°C, 185°C, the length-to-diameter ratio of the extrusion screw is 40, and the rotation speed of the extrusion screw is 350 rpm. The prepared mixture was subjected to a performance test, and the test results are shown in Table 2.
Embodiment 2
[0025] Take the raw materials by weighing the components and proportioning ratio (parts by weight) in Table 1
[0026] Mix each raw material in a high-speed mixer for 10 minutes to mix evenly, extrude the mixed blend through a twin-screw extruder to obtain a composition, and the temperature of each zone of the extruder from the feeding section to the head temperature is sequentially 170°C, 185°C, 185°C, 185°C, 185°C, 190°C, 195°C, 195°C, 195°C, 200°C, the length-to-diameter ratio of the extrusion screw is 36, and the rotation speed of the extrusion screw is 350 rpm. The prepared mixture was subjected to a performance test, and the test results are shown in Table 2.
Embodiment 3
[0028] Take the raw materials by weighing the components and proportioning ratio (parts by weight) in Table 1
[0029] Mix each raw material in a high-speed mixer for 15 minutes and mix evenly. The mixed blend is extruded and granulated by a twin-screw extruder to obtain a composition. The temperature of each zone of the extruder is from the feeding section to the head temperature. 150°C, 170°C, 175°C, 175°C, 175°C, 180°C, 180°C, 180°C, 180°C, 195°C, the length-to-diameter ratio of the extrusion screw is 40, and the rotation speed of the extrusion screw is 350 rpm. The prepared mixture was subjected to a performance test, and the test results are shown in Table 2.
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Abstract
The invention discloses a low-crystalline-degree polypropylene composition and a preparation method thereof. The polypropylene composition includes, by weight, 60-78 parts of copolymerized polypropylene, 12-22 parts of metallocenepolyethylene, 10-18 parts of polybutylene, and 0.1-1 part of an antioxidant. The preparation method includes steps of mixing and extrusiongranulation. The low-crystalline-degree polypropylene is modified by the metallocenepolyethylene and polybutylene, so that the composition has low crystalline degree which can reach 14-25%, and is excellent in impacttoughness. In addition, the preparation method preparation process, has simple operations and is low in raw material cost, and broadens application field and range of polypropylene.
Description
technical field [0001] The invention relates to the technical field of modified materials, in particular to a low-crystallinity polypropylene composition and a preparation method thereof. Background technique [0002] Polypropylene has the advantages of good mechanical properties, non-toxicity, low relative density, heat resistance, chemical resistance, easy processing and molding, and low price. Through processing and modification, it can endow the resin with outstanding physical and mechanical properties, and thus replace some engineering plastics. In recent years, great progress has been made in the engineering of general-purpose plastics, and it is the fastest growing among the five general-purpose synthetic resins. The most active variety in the development of new varieties. [0003] Although polypropylene and polypropylene alloy materials are widely used in many fields, their crystallinity is about 55%-75%, and their dimensional stability is poor. After modification, ...
Claims
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Application Information
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