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Preparation method of low-normal-hexane-dissolution transparent polypropylene material

A technology of transparent polypropylene and n-hexane, applied in the field of preparation of transparent polypropylene materials, can solve the problems of material softening, unfavorable materials, increasing the content of low-molecular random substances, etc., and achieve high transparency and surface gloss, good melting Fluidity and rigidity of the body, increased utilization and added value

Inactive Publication Date: 2017-09-15
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the ethylene content exceeds 0.5wt%, the material tends to become soft and the tensile modulus decreases, which is unfavorable for the application of the material
At the same time, the low molecular weight part of ethylene-propylene random copolymerized polypropylene often has too high ethylene content, thereby increasing the content of low molecular random substances in the product, resulting in a high n-hexane extract of the product, which limits its application range, especially Food packaging and medical fields
Moreover, the low molecular weight substances of random copolymers containing ethylene components are easy to migrate to the surface of the material, affecting the transparency and surface gloss of the material

Method used

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  • Preparation method of low-normal-hexane-dissolution transparent polypropylene material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add propylene and 1-butene into the loop reactor, and add catalyst DQC-401, cocatalyst triethylaluminum (TEAL), electron donor DONOR-C, antistatic agent Atmer163. Among them: catalyst DQC-401 is added according to the output of 40kg / ton; TEAL / C 3 (Propylene) = 0.16; TEAL / DONOR=5; antistatic agent Atmer163 is 2~3kg / h. Stir evenly, control the reaction temperature in the loop reactor to 70±1°C, the reaction pressure to 3.5MPa, the hydrogen concentration to 2540ppm, and the bonded 1-butene content to 4.3%, so as to obtain the propylene-butylene random copolymerization polypropylene base resin.

[0027] According to the proportion, 99.6% of acrylonitrile-butadiene random copolymerized polypropylene base resin, 0.20% of transparent agent, 0.15% of main and auxiliary antioxidant and 0.05% of halogen absorbent are mixed at normal temperature and pressure for 2 to 4 minutes, and then used The twin-screw extruder is used for granulation, and the temperature is controlled at 160...

Embodiment 2

[0029] Add propylene and 1-butene into the loop reactor, and add catalyst DQC-401, cocatalyst triethylaluminum (TEAL), electron donor DONOR-C, antistatic agent Atmer163. Among them: catalyst DQC-401 is added according to the output of 40kg / ton; TEAL / C 3 (Propylene) = 0.16; TEAL / DONOR=5; antistatic agent Atmer163 is 2~3kg / h. Stir evenly, control the reaction temperature in the loop reactor to 70±1°C, the reaction pressure to 3.7MPa, the hydrogen concentration to 2680ppm, and the bonded 1-butene content to 4.7%, so as to obtain the propylene-butylene random copolymerization polypropylene base resin.

[0030] According to the proportion, 99.6% of acrylonitrile-butadiene random copolymerized polypropylene base resin, 0.20% of transparent agent, 0.15% of main and auxiliary antioxidant and 0.05% of halogen absorbent are mixed at normal temperature and pressure for 2 to 4 minutes, and then used The twin-screw extruder is used for granulation, and the temperature is controlled at 160...

Embodiment 3

[0032] Add propylene and 1-butene into the loop reactor, and add catalyst DQC-401, cocatalyst triethylaluminum (TEAL), electron donor DONOR-C, antistatic agent Atmer163. Among them: catalyst DQC-401 is added according to the output of 40kg / ton; TEAL / C 3 (propylene) = 0.16; TEAL / DONOR=5; antistatic agent Atmer163 is 2~3kg / h. Stir evenly, control the reaction temperature in the loop reactor to 70±1°C, the reaction pressure to 3.7MPa, the hydrogen concentration to 2620ppm, and the bonded 1-butene content to 5.1%, so as to obtain the propylene-butylene random copolymerization polypropylene base resin.

[0033] According to the proportion, 99.6% of acrylonitrile-butadiene random copolymerized polypropylene base resin, 0.20% of transparent agent, 0.15% of main and auxiliary antioxidant and 0.05% of halogen absorbent are mixed at normal temperature and pressure for 2 to 4 minutes, and then used The twin-screw extruder is used for granulation, and the temperature is controlled at 160...

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Abstract

The invention discloses a preparation method of a low-normal-hexane-dissolution transparent polypropylene material. The preparation method comprises the following steps of (1) polymerizing propylene and a comonomer of 1-butylene in a loop reactor in the presence of catalysts, promoter, electron donors and antistatic agent at a reaction temperature of 69-71 DEG C, a reaction pressure of 3.4-3.8 MPa, a hydrogen concentration of 2500-2700 ppm and a 1-butylene concentration of 4%-6% to obtain propylene-butylene polypropylene random copolymer resin; (2) uniformly mixing the propylene-butylene polypropylene random copolymer resin, transparent reagent, primary antioxidants, secondary antioxidants and halogen absorber at normal pressure and temperature, feeding the mixture into an extruder for extruding granulation, cooling granulated materials in cooling water to obtain the low-normal-hexane-dissolution transparent polypropylene material. The prepared low-normal-hexane-dissolution transparent polypropylene material is good in machining performance, transparency and rigidity and tenacity balance and low in normal hexane dissolution and obtains optimal comprehensive properties such as optical properties, mechanical properties and food safety, thereby meeting the requirements of the markets of the fields of food packaging and medicine on transparent polypropylene.

Description

technical field [0001] The invention relates to a preparation method of a polypropylene material, in particular to a preparation method of a transparent polypropylene material with low n-hexane dissolution. Background technique [0002] Transparent polypropylene is one of the fastest growing materials and has a wide range of applications in packaging, household goods, medical, food and other industries. However, isotactic polypropylene is brittle and has poor transparency, which limits its use. In order to expand the application range of polypropylene and improve its impact resistance and optical properties. By copolymerizing with other olefins to make random copolymers, the above-mentioned properties of the product can be improved, and the application range of propylene copolymers is wider. Compared with polypropylene homopolymer, the introduction of ethylene or other α-olefin comonomers will destroy the main chain structure of polypropylene molecules and reduce the cryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08K5/134C08K5/526C08K5/527C08K5/098C08F210/06C08F210/08
CPCC08F210/06C08K5/098C08K5/1345C08K5/526C08K5/527C08L2201/10C08F210/08C08F2500/15C08L23/14
Inventor 易志勤钟向宏梁胜彪黄艳芳刘国禹蒋文军冯家盛王碧琼梁志斌
Owner CHINA PETROLEUM & CHEM CORP
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