Modified mould nylon

A casting nylon and modification technology, applied in the field of engineering plastics, can solve the problems of unsatisfactory comprehensive performance and complicated process, and achieve the effects of reducing air bubbles, simple process and reducing production energy consumption.

Inactive Publication Date: 2008-02-13
张静焕
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modified cast nylon prepared by this method is still not ideal in comprehensive performance, and its process is complicated.

Method used

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  • Modified mould nylon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a. Weigh 8kg of caprolactam, 0.5kg of laurolactam, 0.5kg of 50nm europium metal powder, 1kg of sodium hydroxide, and 1.5kg of toluene isocyanate;

[0030] b. Put caprolactam and laurolactam in a reaction kettle, heat to 100°C, melt, add nano europium metal powder, start the stirrer to stir for 10 minutes to make it uniform; vacuumize and dehydrate at 120°C for 10 minutes.

[0031] c, add catalyst sodium hydroxide, and pass into nitrogen protection;

[0032] d. Add toluene isocyanate, stir evenly, and keep the temperature at 120°C;

[0033] e. Pour into a mold preheated to 160°C. After the polymerization reaction is carried out for 10 minutes, the mold is cooled for about 10 minutes to make the contents solidify into a solid billet, and then demould.

Embodiment 2

[0035] a, take caprolactam 8kg, laurolactam 1kg, particle diameter is 1kg of bastnaesite powder of 100 nanometers, sodium hydroxide 1.5kg, toluene isocyanate 2kg;

[0036] b. Put caprolactam and laurolactam in the reaction kettle, heat to 90°C, melt, add nano-rare earth, start the stirrer to stir for 15 minutes to make it uniform; 110°C for vacuum dehydration for 12 minutes

[0037] c, add catalyst sodium hydroxide, and pass into nitrogen protection;

[0038] d. Add toluene isocyanate, stir evenly, and keep the temperature at 140°C;

[0039] e. Pour into a mold preheated to 170°C. After the polymerization reaction is carried out for 10 minutes, the mold is cooled for about 15 minutes to make the contents solidify into a solid billet, and then demould.

Embodiment 3

[0041] a. Weigh 8kg of caprolactam, 0.5kg of laurolactam, 0.5kg of 20nm europium oxide, 1kg of sodium hydroxide, and 1.5kg of polyisocyanate;

[0042] b. Put caprolactam and laurolactam in the reaction kettle, heat to 90°C, melt, add 20 nanometer europium oxide, start the stirrer to stir for 10 minutes to make it uniform; vacuumize and dehydrate at 130°C for 15 minutes;

[0043] c, add catalyst sodium hydroxide, and pass into nitrogen protection;

[0044] d. Add polyisocyanate, stir evenly, and keep the temperature at 120-140°C;

[0045] e. Pour into a mold preheated to 160-170°C. After polymerization for 15 minutes, cool the mold for about 15 minutes to solidify the contents into a solid billet and demould.

[0046] The preparation methods of Examples 4-8 are the same as above, except that the components and dosage are different, but they have the effects described in the present invention.

[0047]

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Abstract

The invention discloses a modified cast nylon with good comprehensive performance, and provides a simple and feasible method for preparing the modified cast nylon. The invention is made of caprolactam, laurolactam, nano rare earth, sodium hydroxide, toluene isocyanate or polyisocyanate; the method is to add nano rare earth after heating caprolactam and laurolactam, and stir evenly; vacuumize and dehydrate; add After the catalyst is stirred evenly, it is poured into the mold, and after the polymerization reaction, it is solidified into a solid billet. The cast nylon prepared by the invention has high density, tensile strength, toughness and wear resistance, low water absorption and small wear coefficient.

Description

technical field [0001] The present invention relates to engineering plastics, in particular to a modified cast nylon. Background technique [0002] Cast nylon (Mc nylon) is a widely used engineering plastic. It usually dehydrates the molten caprolactam monomer under reduced pressure under normal pressure, and uses a strong base as a catalyst. After further dehydration, it is mixed evenly with the co-catalyst toluene isocyanate or polyisocyanate, and then directly injected into a mold that is preheated to a certain temperature. aggregated. Compared with ordinary nylon products, cast nylon has significant advantages in many aspects such as strength, stiffness, and wear resistance. Therefore, cast nylon is widely used in the manufacture of various mechanical parts. Especially in recent years, the cast nylon rotary molding large-scale hollow device and the continuous polymerization technology to produce high molecular weight nylon 6 pellets have further expanded its applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/14C08G69/16C08K3/08
Inventor 张静焕
Owner 张静焕
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