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Reversible micro-crosslinking high melt strength polypropylene and preparation method thereof

A high-melt-strength, polypropylene technology, applied in the field of reversible micro-crosslinking high-melt-strength polypropylene and its preparation, can solve the problems of complicated operation and high equipment investment, achieve small loss of mechanical properties, improve material properties, and improve the The effect of liquidity

Active Publication Date: 2019-05-14
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires high equipment investment and complicated operation.

Method used

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  • Reversible micro-crosslinking high melt strength polypropylene and preparation method thereof
  • Reversible micro-crosslinking high melt strength polypropylene and preparation method thereof
  • Reversible micro-crosslinking high melt strength polypropylene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mixing of raw materials: mix 10000 grams of polypropylene (Qilu Petrochemical, melt index 3.5 grams / 10 minutes, grade T30s), 10 grams of 2,5-dimethyl-2,5-bis(tert-butylperoxy) Hexane (Bai Lingwei Technology Co., Ltd.), 20 grams of tetramethylthiuram disulfide (Bai Lingwei Technology Co., Ltd.) and 20 grams of 1-tetradecyl-3-methylimidazole bromide (West Asia reagent) in a high-speed mixer The mixing is uniform, the speed of the high-speed mixer is 100 rpm, and the mixing time is 10 minutes.

[0029] (2) Screw extrusion reaction: Add the mixed materials in step (1) to the twin-screw extruder for grafting reaction. The temperature of each screw is 195 / 205 / 205 / 210 / 210 / 215 / 215 / 215 / 210 / 210 / 195℃, the screw speed is 220 rpm.

[0030] (3) The reaction is terminated: 30 grams of antioxidant masterbatch, antioxidant 1010 (primary antioxidant) and antioxidant 168 (secondary antioxidant), the mass ratio of primary / secondary antioxidant is 1:1 from the screw The feeding port on th...

Embodiment 2

[0033] The raw materials were mixed, reacted and terminated according to the method of Example 1, except that the active crosslinking agent used 1-dodecyl-3-methylimidazole nitrate ((C 12 Min + ) 2 NO 3 2- ), the dosage is 20 grams. The amount of each substance added during the extrusion process is shown in Table 1, and the test result is shown in Table 2.

Embodiment 3

[0035] The raw materials were mixed, reacted and terminated according to the method of Example 1, except that the amount of tetramethylthiuram disulfide was 25 grams. The amount of each substance added during the extrusion process is shown in Table 1, and the test result is shown in Table 2.

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Abstract

The invention discloses a reversible micro-crosslinking high melt strength polypropylene and a preparation method thereof. To prepare the reversible micro-crosslinking high melt strength polypropylene, the reaction of polypropylene, initiator, free radical stabilizer and active crosslinking agents is carried out, and then antioxidants are added to terminate the reaction to obtain the reversible micro-crosslinking high melt strength polypropylene, wherein the active crosslinking agents are selected from one or more of the ionic liquid with a C5-C30 long hydrocarbon chain. The preparation methodof the reversible micro-crosslinking high melt strength polypropylene includes the steps of evenly mixing the polypropylene, initiator, free radical stabilizer and active crosslinking agents in proportion in a high speed mixer, adding the mixed material to a twin-screw extruder for melt extrusion reaction, and then adding antioxidant masterbatch from side feed to terminate the reaction. The preparation method of the reversible micro-crosslinking high melt strength polypropylene has the advantages of effectively improving the melt strength and mechanical properties of polypropylene materials,and guaranteeing small material performance loss after repeated processing.

Description

technical field [0001] The invention relates to a reversible micro-crosslinked high-melt strength polypropylene and a preparation method thereof, in particular to a method for introducing an active crosslinking point between polypropylene molecular chains, thereby improving the melt strength and mechanical properties of polypropylene materials method. Background technique [0002] Polypropylene is a general-purpose resin with excellent performance. Because of its advantages such as low density, non-toxicity, easy processing, corrosion resistance and good electrical insulation, it is widely used in automobiles, home appliances, electronic appliances, packaging and building materials, etc. . Since polypropylene is a semi-crystalline material, the softening point is very close to the melting point. After exceeding the melting point, the melt strength decreases rapidly with temperature and the sag resistance is poor, which greatly limits its application in thermoforming, extrus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08J3/24
Inventor 张文勇陈海波
Owner WANHUA CHEM GRP CO LTD
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