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Core-shell toughening agent, preparation method thereof and toughened nylon applying core-shell toughening agent

A core-shell toughening agent and a technology of a toughening agent, applied in the field of toughening nylon, can solve the problems of unstable toughening effect of the toughening agent, affecting the quality of nylon, increasing processing difficulty, etc., and achieving excellent toughening effect and physical properties. Improve the effect of easy industrial production

Active Publication Date: 2021-10-29
XIAMEN KEAISI PLASTICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of grafting, the distribution of maleic anhydride in the molecular chain is difficult to control, so it is easy to cause crosslinking in the process of toughening nylon and reduce the fluidity, resulting in unstable toughening effect of the toughening agent, increasing the subsequent Difficulty in processing affects the quality of nylon

Method used

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  • Core-shell toughening agent, preparation method thereof and toughened nylon applying core-shell toughening agent
  • Core-shell toughening agent, preparation method thereof and toughened nylon applying core-shell toughening agent
  • Core-shell toughening agent, preparation method thereof and toughened nylon applying core-shell toughening agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] Preparation example of polyketone graft and EPDM graft

[0042] Preparation example of polyketone graft

preparation example A1

[0044] In this preparation example, 2,5-di-tert-butylperoxy-2,5-dimethylhexane (DHBP) was selected as the first initiator.

[0045] 0.5kgDHBP and 5kg maleic anhydride were uniformly mixed in a mixing device to form a mixture, and the mixing time was 10 minutes. Add 94kg of polyketone to the twin-screw extruder after metering the main feed, and add the mixture of DHBP and maleic anhydride to the twin-screw extruder after metering the side feed, melt and plasticize, react extrusion, granulate, cool, Dry to obtain polyketone grafts.

[0046] The screw speed is 450r / min, and the screw length-to-diameter ratio is 52:1.

[0047] During the reaction, set the temperature of each section inside the twin-screw extruder as follows: first section 155°C, second section 195°C, third section 215°C, fourth section 215°C, fifth section 215°C, sixth section 205°C, seventh section 205°C ℃, eighth section 195°C, ninth section 185°C, tenth section 185°C, nose section 235°C.

preparation example A2

[0049] In this preparation example, bis-tert-butylperoxydiisopropylbenzene (BIPB) was selected as the first initiator.

[0050] 0.25kg BIPB and 3kg maleic anhydride were uniformly mixed in a mixing device to form a mixture, and the mixing time was 10 minutes. Add 96kg of polyketone to the twin-screw extruder after metering the main feed, and add the mixture of BIPB and maleic anhydride to the twin-screw extruder after metering the side feed, melt plasticization, reaction extrusion, granulation, cooling, Dry to obtain polyketone grafts.

[0051] The screw speed is 400r / min, and the screw length-to-diameter ratio is 52:1.

[0052] During the reaction, set the temperature of each section inside the twin-screw extruder as follows: first section 165°C, second section 205°C, third section 225°C, fourth section 225°C, fifth section 225°C, sixth section 215°C, seventh section 215°C ℃, eighth section 205°C, ninth section 195°C, tenth section 195°C, nose section 235°C.

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PUM

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Abstract

The invention relates to the technical field of nylon toughening agents, and particularly discloses a core-shell toughening agent, a preparation method thereof and nylon applying the core-shell toughening agent. The maleic anhydride functionalized core-shell toughening agent is of a core-shell structure with a polyketone graft as a shell and an ethylene propylene diene monomer graft as a core, and comprises polyketone, ethylene propylene diene monomer, maleic anhydride, an initiator, an assistant crosslinker and a silane coupling agent; the preparation method comprises the following steps: initiating free radicals of the ethylene propylene diene monomer and the silane coupling agent by an initiator to generate grafting reaction to obtain an ethylene propylene diene monomer graft; and initiating free radicals of polyketone and maleic anhydride to carry out grafting reaction by the initiator to obtain a polyketone graft, and finally extruding the ethylene propylene diene monomer graft and the polyketone graft in an extruder to obtain the core-shell toughening agent. The prepared toughening agent can reduce the uncertainty of the grafting number and grafting position of maleic anhydride in the grafting process, the quality of the core-shell toughening agent is improved, and the physical performance of toughened nylon is improved.

Description

technical field [0001] The present application relates to the technical field of nylon toughening agents, in particular to a core-shell toughening agent, its preparation method and its application to toughen nylon. Background technique [0002] Nylon is one of the five general-purpose engineering plastics. Nylon has a large output and a wide range of uses. It has excellent mechanical strength, heat resistance, oil resistance, weak acid resistance, alkali resistance and general solvent resistance. It is non-toxic, odorless, good electrical insulation, and good weather resistance. . The disadvantage of nylon is that its notched impact performance is average, and its products need post-humidity conditioning treatment to improve toughness. At the same time, nylon has a large water absorption rate, which affects the dimensional stability of products, increases production costs, and greatly limits its application. In order to solve the problem of insufficient toughness of nylon, ...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08L77/02C08L87/00
CPCC08G81/021C08L77/02C08L87/005
Inventor 吴龙解郑磊
Owner XIAMEN KEAISI PLASTICS TECH
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