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Nucleating agent composition for transparent polypropylene, application of nucleating agent composition and polypropylene composition

A technology of transparent polypropylene and composition, applied in the field of plastics, can solve the problems of low precipitation, limited compatibility of polypropylene, easy generation of vacuum pores, etc., and achieve the effects of wide processing window, excellent dispersibility, and excellent transparency

Pending Publication Date: 2022-05-24
弘元(上海)高分子材料有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] 1,3:2,4-bis(3,4-dimethylbenzylidene)-D-sorbitol (DMDBS) nucleating agent due to its unique principle, excellent thermal stability, odorless, low precipitation, etc. Advantages, it has been widely used, and a small amount of addition can significantly improve the transparency of polypropylene and reduce the haze value, but the DMDBS transparent nucleating agent has a high melting point and limited compatibility with polypropylene, resulting in a saturated concentration. If the concentration exceeds this concentration, the haze value will not decrease, but will increase. At the same time, the anti-reflection effect in thick polypropylene products is not ideal, and it is easy to produce vacuum pores.

Method used

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  • Nucleating agent composition for transparent polypropylene, application of nucleating agent composition and polypropylene composition

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Embodiment

[0040] Taking polypropylene material as the base material, the parts by weight of each component are as follows:

[0041] The polypropylene material: 100 parts,

[0042] The main antioxidant is 0.001-0.2 parts,

[0043] The auxiliary antioxidant is 0.001-0.2 parts,

[0044] Acid scavenger is 0.01-0.3 parts,

[0045] The nucleating agent DMDBS is 0.15-0.5 parts,

[0046] The transparency modifier is 0.05-0.5 parts.

[0047] Antistatic agent is 0.03-0.2 parts

[0048] During preparation, the aforementioned components were added to a high-speed kneader, stirred and mixed for 5 minutes, and then mixed and granulated in a twin-screw extruder. The extrusion and granulation temperatures were set at 190°C and 230°C, respectively. Then, the polypropylene resin particles obtained by granulation were injected with standard samples at 190°C and 230°C for testing, and the haze values ​​of the standard samples obtained at different molding temperatures were compared. The lower the haze ...

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Abstract

The invention relates to the technical field of plastics, and provides a nucleating agent composition for transparent polypropylene, application of the nucleating agent composition and a polypropylene composition. The nucleating agent composition is prepared from the following components in parts by weight on the basis of 100 parts by weight of polypropylene: 0.001 to 0.2 part of a main antioxidant, 0.001 to 0.2 part of an auxiliary antioxidant, 0.01 to 0.3 part of an acid removal agent, 0.15 to 0.5 part of a sorbitol acetal nucleating agent, 0.05 to 0.5 part of a transparent modifier and 0.03 to 0.2 part of an antistatic agent. The nucleating agent composition for transparent polypropylene has a wider processing window while maintaining high transparency of a polypropylene composition.

Description

technical field [0001] The invention relates to the technical field of plastics, in particular to a nucleating agent composition for high-transparency polypropylene, its application and a polypropylene composition. Background technique [0002] Polypropylene is an incompletely crystalline resin, and when homogeneously crystallized from the melt, large spherulites are often formed, and the crystallinity is low. On the one hand, the size of the spherulites is larger than the wavelength of visible light, which may lead to scattering or reflection of light. On the other hand, the refractive index of the crystalline region and the amorphous region is different, resulting in the occurrence of light refraction, all of which directly cause the haze of the product to increase. . It is not difficult to understand that improving the transparency of polypropylene products can start from two aspects, that is, reducing the size of spherulites to make them smaller than the wavelength of v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/053C08K5/134C08K5/526C08K5/098C08L23/12
CPCC08K5/053C08K5/1345C08K5/526C08K5/098C08L2201/10C08K2201/014C08L23/12
Inventor 刘小龙段怡飞张春霞刘晓明
Owner 弘元(上海)高分子材料有限公司
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