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Toughening rubber for nylon and preparation method thereof

A technology of rubber and nylon, applied in the field of high-efficiency toughened rubber for nylon and its preparation, can solve the problems of large amount of toughening agent added, affecting the effect of modification, and other properties of nylon, and achieving good compatibility, Good dispersion, improve toughness effect

Active Publication Date: 2013-04-10
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned methods have achieved the purpose of nylon toughening to a certain extent, the dispersion of rubber in the nylon matrix will largely affect the effect of modification due to the incompatibility between rubber and nylon itself.
Moreover, in most cases, the use of rubber to toughen nylon requires a large amount of toughening agent, which will seriously reduce the other properties of nylon to a certain extent.

Method used

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  • Toughening rubber for nylon and preparation method thereof
  • Toughening rubber for nylon and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to mass percentage, first add 0.40 parts of sodium caprolactam to 90 parts of molten caprolactam monomer, then add 10 parts of nitrile rubber with an average particle size of 0.1 μm, and keep the system at 140 ° C for 60 minutes. Next, filter the mixture with a Buchner funnel, wash the filter cake with water and then dry it in vacuum at 80° C. for 24 hours to obtain a high-efficiency toughened rubber for nylon. Nylon 6 and the high-efficiency toughening rubber for nylon with a weight of 1.5% are melt-blended in an extruder, and after drying the extruded product at 100°C for 5 hours, it is made into a standard sample by an injection molding machine, and its mechanical properties As shown in Table 1.

Embodiment 2

[0021] According to mass percentage, first add 0.83 parts of sodium butyrolactam to 80 parts of molten butyrolactam monomer, then add 20 parts of nitrile silicone rubber with an average particle size of 0.3 μm, and keep the system slightly boiling at 100 ° C 10min. Next, filter the mixture with a Buchner funnel, wash the filter cake with water and then dry it in vacuum at 80° C. for 24 hours to obtain a high-efficiency toughened rubber for nylon. Nylon 4 and the high-efficiency toughening rubber for nylon with a weight of 3.0% are melt-blended in an extruder, and after drying the extruded product at 100°C for 5 hours, it is made into a standard sample by an injection molding machine, and its mechanical properties As shown in Table 1.

Embodiment 3

[0023] According to mass percentage, first add 2.5 parts of sodium laurolactam to 85 parts of molten laurolactam monomer, and then add 15 parts of sodium nitrile rubber with an average particle size of 5.0 μm. Keep the system slightly boiling for 3min. Next, filter the mixture with a Buchner funnel, wash the filter cake with water and then dry it in vacuum at 80° C. for 24 hours to obtain a high-efficiency toughened rubber for nylon. Melt and blend nylon 12 and the high-efficiency toughened rubber for nylon with a weight of 5.0% in an extruder, dry the extruded product at 100°C for 5 hours, and then make a standard sample through an injection molding machine. As shown in Table 1.

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Abstract

The invention relates to toughening rubber for nylon and a preparation method thereof, and the rubber comprises the following components in parts by weight: 10-30 parts of nitrile rubber, 70-90 parts of lactam and 0.1-6 parts of anionic initiator. A product with core-shell structure, which takes rubber as a core and takes nylon as a shell, is obtained by initializing anionic ring-opening polymerization reaction of lactam monomers and utilizing nitrile groups on the surface of the rubber under the condition that the anionic initiator exists in the nitrile rubber and the lactam monomers. Compared with the prior art, the high-efficient toughening rubber for the nylon not only has good compatibility with the nylon, but also has the capability of realizing good dispersion in a nylon matrix; therefore, by adding a small amount of the toughening rubber, the toughness of the nylon can be improved to a great extent with few impacts on the strength of the nylon.

Description

technical field [0001] The invention relates to polymer materials, in particular to a high-efficiency toughened rubber for nylon and a preparation method thereof. Background technique [0002] Nylon is a class of engineering plastics widely used in industry and daily life. It has excellent mechanical properties, wear resistance, acid and alkali resistance, and self-lubrication; it also has the advantages of low density, simple processing technology, and low cost. However, pure nylon has obvious disadvantages. It is sensitive to notches. In the occasions requiring high impact, the use of nylon products is often limited. Therefore, the research on the toughening modification of nylon has become an important part of nylon modification. [0003] Modification of nylon with rubber is a major method of toughening nylon. Commonly used rubbers include EPDM, nitrile rubber, and styrene-butadiene rubber. Due to the poor compatibility of these rubbers with the nylon matrix, functional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/00C08L77/02C08L9/02C08L19/00C08G69/18
Inventor 吴方娟杨桂生
Owner HEFEI GENIUS NEW MATERIALS
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