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Toughened nylon, nylon toughening agent and preparation method

A toughening agent, nylon technology, applied in the field of toughening nylon preparation by ionic and reactive extrusion technology, can solve the problem of reducing the efficiency of grafting polyolefin with polar monomers, reducing the mechanical properties of nylon materials, and the adverse effects of extrusion processes. and other problems, to achieve the effect of reducing cross-linking and degradation side reactions, reducing the decline of mechanical properties, and low cost

Active Publication Date: 2017-03-15
ENERGY RES INST OF SHANDONG ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation of polyolefin grafts, in addition to the main reaction of grafting polyolefin with polar monomers, the peroxide initiator and extrusion process will also cause many side reactions to occur (such as the cross reaction of polyethylene). side reactions of polyolefins or polypropylene degradation), which significantly reduces the efficiency of grafting polyolefins with polar monomers, and changes in the melt index of polyolefin materials will affect the subsequent processing properties when mixed with nylon
When using this kind of grafted polyolefin and nylon for reactive extrusion to prepare toughened nylon, it will not only have a negative impact on the extrusion process; but also due to the low grafting rate of polyolefin, it is necessary to add a large amount of polyolefin to meet the toughness requirements of the material. This will significantly reduce the mechanical properties of the nylon material

Method used

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  • Toughened nylon, nylon toughening agent and preparation method
  • Toughened nylon, nylon toughening agent and preparation method
  • Toughened nylon, nylon toughening agent and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: comparative example

[0032] Weigh 84.9 parts of LDPE (parts by weight, the same below, Yanshan Petrochemical LD160, melt index 5.0g / 10min), 12.0 parts of maleic anhydride, 0.1 part of dibenzoyl peroxide, 3.0 parts of antioxidant 1010, and Dissolve acid anhydride in 10.0 parts of absolute ethanol, dissolve dibenzoyl peroxide in 5.0 parts of absolute ethanol, mix LDPE, dibenzoyl peroxide solution, maleic anhydride solution, and antioxidant 1010 in a high-speed mixer Mix evenly, put the above mixture into the hopper of the extruder, the temperature of each zone of the extruder is between 150°C and 180°C, the speed of the main screw is 60 rpm, the speed of the feeding screw is 10 rpm, and the extruded product is drawn , cooling, drying, and pelletizing to obtain maleic anhydride grafted LDPE particles. Weigh 93.0 parts of nylon 6, 4.0 parts of maleic anhydride grafted LDPE, and 3.0 parts of antioxidant 1010, mix them evenly in a high-speed mixer, put them in...

Embodiment 2

[0034] Weigh 97.0 parts of LDPE (parts by weight, the same below, Yanshan Petrochemical LD160, melt index 5.0 g / 10min), 1010 3.0 parts of antioxidant. Put LDPE in a plasma reaction device, such as figure 1 As shown, vacuumize first, then introduce carbon dioxide, the gas pressure is 60Pa, the radio frequency discharge power is 30W, and the discharge time is 15min, to obtain LDPE grafted with polar groups. Weigh 93.0 parts of Nylon 6, 4.0 parts of grafted LDPE, and 3.0 parts of antioxidant 1010, mix them evenly in a high-speed mixer, put them into the hopper of the extruder, and set the speed of the main screw at 80 rpm between 200 ° C and 260 ° C / min, the feeding screw speed is 40 rev / min, the reaction is carried out, and the extruded product is drawn, cooled, dried, and pelletized to obtain toughened nylon particles. Among them, low-temperature plasma reaction device and extruder are commonly used equipment in this field, and can be obtained through commercial channels.

Embodiment 3

[0035] Embodiment 3: (comparative example)

[0036] Weigh 97.0 parts of LDPE (parts by weight, the same below, Yanshan Petrochemical LD160, melt index 5.0 g / 10min), 1010 3.0 parts of antioxidant. The LDPE was placed in a plasma reaction device, air was introduced, the gas pressure was 60Pa, the radio frequency discharge power was 30W, and the discharge time was 15min to obtain LDPE grafted with polar groups. Weigh 93.0 parts of Nylon 6, 4.0 parts of grafted LDPE, and 3.0 parts of antioxidant 1010, mix them evenly in a high-speed mixer, put them into the hopper of the extruder, and set the speed of the main screw at 80 rpm between 200 ° C and 260 ° C / min, the feeding screw speed is 40 rev / min, the reaction is carried out, and the extruded product is drawn, cooled, dried, and pelletized to obtain toughened nylon particles.

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Abstract

The invention discloses toughened nylon, a nylon toughening agent and a preparation method. The preparation method comprises the steps that graft polyolefin is prepared through a low-temperature plasma technique to serve as the toughening agent, wherein polyolefin is placed in a plasma reaction device, surface treatment is conducted on polyolefin by introducing carbon dioxide or mixed gas of carbon dioxide and other gas, and polyolefin containing carboxyl and carbonyl polar group graft on the surface is obtained; nylon, graft polyolefin and an antioxidant are weighed by weight and mixed to be uniform, the mixture is put into an extruder for a reaction, extrudate is pulled, cooled, dried and subjected to grain-sized dicing, and toughened nylon particles are obtained. The prepared toughened nylon material can be widely applied to the fields of automobiles, electronics, machinery, rail transit, sports equipment and the like.

Description

technical field [0001] The invention specifically relates to a toughened nylon, a nylon toughening agent and a preparation method, in particular to a preparation method of toughened nylon combined with low-temperature plasma and reactive extrusion technology. Background technique [0002] Nylon is one of the most widely used and most diverse engineering plastics. The material has good mechanical properties, heat resistance, wear resistance, chemical solvent resistance, self-lubrication and certain flame retardancy. It has excellent performance and can be integrated into complex structural parts, and is widely used in automobiles, electronic appliances, machinery, rail transit, sports equipment and other fields. However, the shortcomings of strong water absorption and poor low-temperature impact performance limit the application range of nylon materials. [0003] Mixing polyolefin or polyolefin elastomer with nylon can significantly improve the material's shortcomings of str...

Claims

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Application Information

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IPC IPC(8): C08J3/28C08L77/02C08L77/06C08L23/26C08K5/134C08L23/06
CPCC08J3/28C08J2323/06C08L77/02C08L77/06C08L23/26C08K5/1345
Inventor 蒋波蔡飞鹏
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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