High-melt-strength polypropylene blend and preparation method thereof
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A high melt strength, polypropylene technology, applied in the field of polypropylene blends and their preparation, can solve the problems of PP degradation and chain scission repair, short active center life, low grafting efficiency, etc., so as to improve the grafting efficiency. , Stabilize free radical lifespan and reduce energy consumption
Active Publication Date: 2014-09-10
TECHN PHYSICS INST HEILONGJIANG ACADOF SCI
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[0004] The present invention aims to solve the problems of large energy consumption, low freeze-drying efficiency, short active center life, low grafting efficiency and failure to produce existing polypropylene b
Method used
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specific Embodiment approach 1
[0035] Embodiment 1: A high melt strength polypropylene blend of this embodiment is formed by melt blending polypropylene powder, pre-irradiated polypropylene powder, pre-irradiated vulcanized rubber powder, monomer additives and heat stabilizers ;
[0036] The mass ratio of the polypropylene powder to the pre-irradiated polypropylene powder is 100:(1-20); the mass ratio of the polypropylene powder to the pre-irradiated vulcanized rubber powder is 100:(1-20); the The mass ratio of the polypropylene powder to the monomer additive is 100:(0.5-10); the mass ratio of the polypropylene powder to the thermal stabilizer is 100:(0.01-1);
[0037] The described pre-irradiation polypropylene powder is that the polypropylene powder is sealed into a PE bag and subjected to electron beam treatment, wherein the electron beam treatment parameters are: the irradiation dose rate is 10 2 kGy / h~10 3 kGy / h, the irradiation dose is 0.1kGy~100kGy, the irradiation time is 0.001h~0.1h, and the oxyg...
specific Embodiment approach 2
[0039] Embodiment 2: The difference between this embodiment and Embodiment 1 is that: the polypropylene powder is homopolypropylene or copolymerized polypropylene; the stereoregularity of the polypropylene powder is isotactic polypropylene, Syndiotactic polypropylene or atactic polypropylene, the polypropylene powder is in the form of powder, and the weight average molecular weight of the polypropylene powder is 50000g / mol-1500000g / mol. Other steps and parameters are the same as in the first embodiment.
specific Embodiment approach 3
[0040] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the rubber latex is polybutadiene rubber latex, styrene-butadiene rubber latex, carboxylated styrene-butadiene rubber latex, nitrile rubber latex, carboxylated butadiene rubber latex Nitrile rubber latex, silicone rubber latex, and acrylic rubber latex. Other steps and parameters are the same as those in Embodiment 1 or 2.
[0041] When the rubber latex described in this embodiment is a mixture, each component is mixed in any ratio.
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Abstract
The invention relates to a polypropylene blend and a preparation method of the polypropylene blend, in particular to a high-melt-strength polypropylene blend and a preparation method of the high-melt-strength polypropylene blend. The high-melt-strength polypropylene blend and the preparation method of the high-melt-strength polypropylene blend aim to solve the problems that an existing high-melt-strength polypropylene blend and a preparation method of the existing high-melt-strength polypropylene blend are high in energy consumption, low in freeze-drying efficiency and grafting efficiency and free of recovering a generated PP degradation broken link. The high-melt-strength polypropylene blend is formed by polypropylene powder, pre-irradiation polypropylene powder, pre-irradiation vulcanized rubber powder, monomer assistants and heat stabilizers in a melt blending mode. The preparation method includes the first step of preparing the pre-irradiation polypropylene powder, the second step of preparing the pre-irradiation vulcanized rubber powder and the third step of preparing the high-melt-strength polypropylene blend. The freeze-drying efficiency is improved, energy consumption is reduced, and the drying efficiency is improved. The use amount of the rubber powder is decreased to 1%-20%, so that the modification cost is lowered; the grafting efficiency is improved by more than one time; the monomer assistants are added, the service life of the active centre is prolonged, and the PP degradation broken link is effectively restrained.
Description
technical field [0001] The invention relates to a polypropylene blend and a preparation method thereof. Background technique [0002] Polypropylene (PP) is one of the three major plastics whose output is second only to polyethylene (PE) and polyvinyl chloride (PVC). It has excellent heat resistance, chemical corrosion resistance and electrical insulation, and has good processing performance, so it is widely used in machinery, chemical industry, electric power and transportation and other fields. However, the PP catalyzed by Ziegler-Natta or metallocene catalysts has a linear structure, and its molecular weight distribution is relatively narrow, so that the softening point and melting point of polypropylene are close, the melting range is short, the melt strength is low, and the processability is poor. . It leads to uneven wall thickness of products during thermoforming, edge curling and shrinkage during extrusion, coating, and calendering, and cell collapse during extrusio...
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