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Low-temperature resistant buckle-against toughening nylon alloy and preparation method thereof

A technology of nylon and alloy, which is applied in the field of new low-temperature-resistant, warpage-resistant and toughened nylon alloy materials and their preparation, and can solve the problems that the impact strength of nylon 12 affects the use area of ​​materials, etc.

Active Publication Date: 2008-12-10
宁波帕斯卡新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, the lack of impact strength of nylon 12 at low temperature seriously affects the use area of ​​the material. Generally, the notched impact strength (Charpy, -30°C) of nylon 12 is less than 100J / m

Method used

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preparation example Construction

[0053] For example, in a specific embodiment of the present invention, the preparation method of the nylon alloy of the present invention includes the following main steps: feeding the modifier, the initiator, the activator, and the lactam monomer into the screw, The anionic ring-opening polymerization is carried out in the machine barrel, and at the same time, the different phases are uniformly dispersed under the shearing action of the screw, and the nylon alloy is obtained by extrusion and granulation. One-step synthesis of nylon alloy has the characteristics of simple process, short process, high efficiency and no pollution.

[0054] As used herein, the "base nylon" of the present invention, unless otherwise stated, is a polymer formed by the anionic ring-opening polymerization of laurolactam monomer or a mixture of laurolactam monomer and other lactam monomers.

[0055] As used herein, the "base nylon component" of the present invention, unless otherwise specified, includ...

Embodiment 1

[0108] Component mass percent: maleic anhydride grafted LDPE 45% (maleic anhydride graft rate 0.9wt%), laurolactam 51.56%, sodium laurolactam 3% (accounting for 5.8% of the total weight of lactam monomer %), acetylated caprolactam 0.44% (accounting for 1% of the molar number of lactam monomers), after mixing the above several materials in a mixer, extrude through a twin-screw, and the screw temperature is controlled at 180-260°C. The speed of the twin-screw extruder is controlled at 20-300 rpm. The properties of the prepared nylon alloy material are shown in Table 1.

[0109] The number average molecular weight of the base nylon is 13400.

Embodiment 2

[0111] The massfraction of maleic anhydride grafted LLDPE is 20% (maleic anhydride graft rate 0.9wt%), laurolactam 77.6%, sodium laurolactam 1.76% (accounting for 2.3% of the total weight of lactam monomer ), acetylated caprolactam 0.64% (accounting for 1% of the lactam monomer moles), after mixing the above several raw materials uniformly in the mixer, extruding through twin-screw, the temperature of the screw is controlled at 230-270°C. The speed of the twin-screw extruder is controlled at 20 to 300 rpm. The properties of the prepared nylon alloy material are shown in Table 1.

[0112] The number average molecular weight of the base nylon was 18,100.

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Abstract

The invention provides a nylon alloy, comprising 50 to 80 percent of matrix nylon and 20 to 50 percent of modifying composition, wherein, the percentage is calculated according to the total weight of the nylon alloy, the matrix nylon is prepared by the lactam monomer anionic ring-opening polymerization, the number average molecular weight of the matrix nylon is between 10,000 and 80,000, the lactam monomer is chosen from urolactam or a mixture of an urolactam monomer and other urolactam monomers; the weight percentage of other urolactam monomers in the urolactam monomer is less than or equal to 50; the modifying composition is chosen from a polymer with an active functional group and / or a polymer with a lateral chain ester group, the number average molecular weight of the polymer is between 10,000 and 4x10<5>; the flexural modulus of the nylon alloy is between 500 and 1,000MPa; moreover, the socle beam nick impact strength at a temperature of 40 DEG C below zero is more than or equal to 200J / m. The nylon alloy has good impact strength and warp resistance at a low temperature.

Description

technical field [0001] The invention relates to a novel low-temperature-resistant, warpage-resistant and toughened nylon alloy material and a preparation method thereof, in particular to a high-viscosity nylon alloy. Background technique [0002] Nylon 12 has the characteristics of low water absorption, good low temperature resistance, good air tightness, excellent alkali resistance and grease resistance, medium resistance to alcohols, inorganic dilute acids and aromatic hydrocarbons, good mechanical properties and electrical properties, and belongs to the natural Extinguishing materials are currently widely used in fuel pipes and brake pipes, optical fiber sleeves, cable coatings, sound-absorbing and anti-seismic components, sports equipment, and food packaging in automobiles. However, due to the high price of nylon 12 (about 120,000 / ton), it seriously affects its application range. How to reduce the cost of materials on the basis of maintaining the mechanical properties o...

Claims

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Application Information

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IPC IPC(8): C08L77/02C08G69/16C08L101/02
Inventor 杜立波杨桂生
Owner 宁波帕斯卡新材料有限公司
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