Lightweight foaming casting nylon material and its preparation method and application

A casting nylon and lightweight technology, which is applied in the field of lightweight foaming and casting nylon materials and its preparation, can solve the problems of difficult control of foaming and poor mechanical properties, and achieve the effects of uniform cells, light weight and brittleness

Active Publication Date: 2018-04-17
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly aims at the shortcomings of difficult foaming control and poor mechanical properties in the existing foam casting production process. The present invention utilizes a foaming agent compounded with a toughening agent, combined with the adjustment of the MCPA6 formulation process, to make the foaming agent in MCPA6 Foaming in the monomer melt, and then polymerizing to form lightweight foaming cast nylon material

Method used

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  • Lightweight foaming casting nylon material and its preparation method and application
  • Lightweight foaming casting nylon material and its preparation method and application

Examples

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preparation example Construction

[0035] The preparation method of lightweight foaming cast nylon material of the present invention, it comprises the following steps:

[0036] S1. Add the above-mentioned amide monomers in parts by weight to the reaction kettles A and B of the casting nylon material equipment at a ratio of 1:1, evacuate to 0.1Mpa, heat and melt, and dehydrate at 120-150°C for 5 ~30min;

[0037] S2. Add the above-mentioned catalyst to the reaction kettle A, keep the temperature of the melt in the kettle constant at 120-140°C, and vacuumize for 10-30 minutes; to obtain the active material A; at the same time, add the co-catalyst to the reaction kettle B in turn , toughening agent, maintain the melt temperature in the kettle at 120-140°C, vacuumize for 10-30min, and obtain active material B;

[0038] S3. Spray and mix active material A and active material B, add foaming agent during the spray mixing process, spray cast into a mold that has been preheated to 140-180°C, and perform magnetic stirrin...

Embodiment 1

[0041] (1) Lightweight foamed cast nylon material

[0042] The lightweight foamed cast nylon material of this embodiment is prepared from the raw materials and proportions in Table 1. Wherein, the amide monomer is caprolactam, the catalyst is sodium hydroxide, the cocatalyst is isocyanate MDI, the foaming agent is sodium carbonate, and the toughening agent is polyether polyol.

[0043] (2) Preparation method of lightweight foamed cast nylon material

[0044] The preparation method of the lightweight foamed cast nylon material of the present embodiment comprises the following steps:

[0045]S1. Add 81.7 parts by weight of caprolactam to the A and B reaction kettles of the casting nylon equipment respectively according to the weight part of 1:1, vacuumize to 0.1MPa, heat and melt, dehydrate at 120°C for 30min, stop vacuuming, and feed Nitrogen protection;

[0046] S2. Add 0.3 parts by weight of sodium hydroxide to reactor A, maintain the melt temperature in the reactor at 120...

Embodiment 2

[0049] (1) Lightweight foamed cast nylon material

[0050] The lightweight foamed cast nylon material of this embodiment is prepared from the raw materials and proportions in Table 1. Wherein, the amide monomer is caprolactam, the catalyst is sodium hydroxide, the cocatalyst is TDI, the foaming agent is AC foaming agent, and the toughening agent is isoprene.

[0051] (2) Preparation method of lightweight foamed cast nylon material

[0052] The preparation method of the lightweight foamed cast nylon material of the present embodiment comprises the following steps:

[0053] S1. Add 66.5 parts by weight of caprolactam into reaction kettles A and B of the casting nylon equipment respectively in parts by weight 1:1, evacuate to 0.1MPa, heat and melt, dehydrate at 140°C for 5 minutes, stop vacuuming, and feed Nitrogen protection;

[0054] S2. Add 0.5 parts by weight of sodium hydroxide to reactor A to maintain the melt temperature in the reactor at 140°C for 10 minutes; at the sa...

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Abstract

The invention discloses a lightweight foaming casting nylon material, which is prepared from, by weight, 40-99.6 parts of amide monomer, 0.1-5 parts of catalyst, 0.1-15 parts of promoter, 0.1-20 partsof foaming agent, and 0.1-20 parts of flexibilizer. The lightweight foaming casting nylon material aims to solve the shortcomings of uncontrollable foaming and poor mechanical performance during theprocess of the existing foaming and casting production. By compounding the foaming agent with the flexibilizer and adjusting the MCPA6 formula technique, the foaming agent is foamed in a MCPA6 monomermelt, so as to further polymerize and shape. The lightweight foaming casting nylon material solves the problem of shaping and contraction of MCAP6. The invention further provides a preparation technique of the lightweight foaming casting nylon material; the foaming technique of the material is stable and the material is good in mechanical performance. The lightweight foaming casting nylon material can be widened to its application domain, and applied to lightweight, shock reduction and noise reduction of an automobile.

Description

technical field [0001] The invention relates to a cast nylon material and its preparation and application, more specifically, to a lightweight foamed cast nylon material and its preparation method and application. Background technique [0002] Nylon material is famous for its high strength, high hardness, good toughness, low creep wear resistance and good chemical stability. Cast nylon products are one of engineering plastics. It has high crystallinity, and its mechanical strength is 1.5 times higher than that of ordinary nylon. It can be directly cast into large parts of tens of kilograms or even hundreds of kilograms. It has a very broad application prospect in metallurgy, chemical industry, especially the contemporary machinery and equipment manufacturing industry. Cast nylon is used as a shock-absorbing and wear-resistant material to replace non-ferrous metals and alloy steels in machinery. Its lubricity prevents damage to abrasive parts and reduces wear, thereby prolong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L71/02C08L75/08C08L47/00C08L63/00C08L75/04C08J9/08C08J9/10C08G69/16B29C44/02B29C44/42
CPCB29C44/02B29C44/42C08G69/16C08J9/0061C08J9/08C08J9/10C08J9/104C08J9/105C08J9/107C08J2201/022C08J2203/02C08J2203/04C08J2377/02C08J2447/00C08J2463/00C08J2471/02C08J2475/04C08J2475/08
Inventor 赖登旺李玉华刘跃军李笃信姜其斌刘爱学郑梯和杨军
Owner HUNAN UNIV OF TECH
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