High melt index polypropylene with low odor and narrow molecular weight distribution and preparation method thereof

A technology of narrow molecular weight distribution and molecular weight distribution, which is applied in the field of high melting index polypropylene and its preparation, can solve the problems of narrow molecular weight distribution of high melting index polypropylene, uneven meltblown cloth, good meltblown effect, etc., and achieve small molecular weight Fewer products, stable process, and improved production environment

Active Publication Date: 2021-04-06
杭州聚丰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high melting point polypropylene with low odor and narrow molecular weight distribution in view of the wide molecular weight distribution and unstable performance of high melting point polypropylene in the prior art, resulting in uneven melt blown cloth and defects such as trachoma in the melt blown process. Refers to the preparation method of polypropylene. The obtained high-melt refers to the polypropylene with narrow molecular weight distribution, low odor and good melt-blown effect.

Method used

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  • High melt index polypropylene with low odor and narrow molecular weight distribution and preparation method thereof
  • High melt index polypropylene with low odor and narrow molecular weight distribution and preparation method thereof
  • High melt index polypropylene with low odor and narrow molecular weight distribution and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Mix 98.75 parts of 225 powder, 0.1 part of antioxidant 1010, 0.2 part of calcium stearate, and 0.2 part of CS6993 into the twin-screw extruder, and inject 0.75 parts of DTBP into the extruder through a liquid pump. In stage 3, the rotation speed of the extruder is 400r / min, and the high melting index polypropylene obtained after cooling and pelletizing is denoted as A1.

Embodiment 2

[0048] Mix 98 parts of 225 powder, 0.1 part of antioxidant 1010, 0.2 part of calcium stearate, and 0.2 part of CS6993 into the twin-screw extruder, and inject 1.5 parts of DTBP into the extruder through a liquid pump. In the third stage, the rotation speed of the extruder is 400r / min, and the high melting index polypropylene obtained after cooling and pelletizing is denoted as A2.

Embodiment 3

[0050] Mix 98 parts of 225 powder, 0.1 part of antioxidant 1010, 0.2 part of calcium stearate, and 0.2 part of CS6993 into the twin-screw extruder, and inject 1.5 parts of DTBP into the extruder through a liquid pump. In the third stage and the fourth stage, the injection volume of each stage is 0.75 parts, the rotation speed of the extruder is 400r / min, and the high melting index polypropylene obtained after cooling and pelletizing is designated as A3.

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Abstract

The invention relates to the technical field of high polymer materials and discloses high melt index polypropylene with low odor and narrow molecular weight distribution and a preparation method thereof. The preparation method comprises the following steps: (1) adding 95-99 parts by mass of polypropylene, 0.2-0.5 part by mass of a nucleating agent, 0.1-0.5 part by mass of an antioxidant and 0.1-0.5 part by mass of a processing assistant into a dual screw extruder to be melted and blended; and (2) adding 0.6-3.5 parts by mass of a degrading agent in batched to obtain the high melt index polypropylene, wherein the degrading agent is added in at least three batches; the length-diameter ratio of the dual screw extruder is 56-64, and the dual screw extruder at least comprises ten sections and is at least provided with three charging ports and two devolatilization ports. The molecular weight distribution of the high melt index polypropylene is not greater than 3, the melting point is not lower than 165 DEG C, a process is more stable in a melt-spray process and prepared melt-spray cloth is more uniform in cloth surface.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a low-molecular-weight and narrow-molecular-weight distribution high-melting-finger polypropylene and a preparation method thereof. Background technique [0002] High-melt polypropylene generally refers to a polypropylene material with a very high melt index. It is the main raw material for melt-blown non-woven fabrics and the core material for products such as masks, protective clothing, diapers, and automotive sound insulation cotton. At present, there are three processes for preparing high melting index polypropylene. The first one is the process of controlling hydrogen during the polymerization of polypropylene (that is, hydrogen adjustment method). However, the range of melting index of polypropylene prepared by this process is limited, and the molecular weight distribution Usually wide, which is not conducive to the production of melt-blown non-woven fabrics; the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B9/06B29C48/76B29C48/40B29C48/285B29C48/05C08L23/12C08K5/134C08K5/14C08K5/098D01F6/46D01F1/10B29K23/00
CPCB29B9/06B29C48/76B29C48/40B29C48/297B29C48/022B29C48/05C08K5/1345C08K5/14C08K5/098D01F6/46D01F1/10C08L2203/12B29K2023/12C08L23/12
Inventor 王笛宋顺刚林振福徐杰杨用峰
Owner 杭州聚丰新材料有限公司
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