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Process for producing epoxy resin//MC nylon composite material

A nylon composite material and epoxy resin technology, which is applied in the field of MC nylon 6 composite material preparation, can solve the problems of increased unpolymerized caprolactam monomer content, decreased polymerization speed, prolonged gel time, etc., and achieves fast polymerization rate and impact strength. Improved, short gel time effect

Inactive Publication Date: 2009-02-18
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the aforementioned two epoxy resin modified MC nylon methods, due to the fact that during the polymerization reaction, active anions are easily deactivated with active hydrogen in the epoxy resin such as: hydroxyl hydrogen, etc., resulting in prolonged gel time, decreased polymerization rate, Problems such as increased content of unpolymerized caprolactam monomer in the product

Method used

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  • Process for producing epoxy resin//MC nylon composite material
  • Process for producing epoxy resin//MC nylon composite material
  • Process for producing epoxy resin//MC nylon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, in reactor, add 200g caprolactam, under nitrogen protection, add 10g bisphenol A type epoxy resin, stir, then add 1g 4,4'-diaminodiphenyl sulfone (DDS), heat To 130°C, react at this temperature for 30min, then switch to the vacuum system, vacuum dehydrate at 130°C for 20min; then release the vacuum, add 0.287g sodium methoxide, react under 750mmHg vacuum degree, wait until the melt temperature rises to about 140°C , maintained for 15min; after releasing the vacuum, quickly add (activator) 0.924g of 2,4-toluene diisocyanate, mix quickly and pour into a mold preheated to 165°C, polymerize in a constant temperature drying oven at 165°C for 30min, stop Heating, cooling to room temperature naturally, and demoulding to obtain epoxy resin / MC nylon 6 composite material.

Embodiment 2

[0021] Embodiment 2, in reactor, add 200g caprolactam, under nitrogen protection, add 20g bisphenol A type epoxy resin, stir, then add 2.5g 4,4'-diaminodiphenyl sulfone (DDS), heat to 130°C, react at this temperature for 30 minutes, then switch to the vacuum system, and vacuum dehydrate at 130°C for 20 minutes; then release the vacuum, add 0.287g of sodium methoxide, and react at a vacuum of 750mmHg. When the melt temperature rises to about 140°C, Maintain for 15 minutes; after releasing the vacuum, quickly add 0.924 g of 2,4-toluene diisocyanate, mix quickly and pour into a mold preheated to 165°C, polymerize in a constant temperature drying oven at 165°C for 30 minutes, stop heating, and cool naturally to After room temperature, the mold is demolded to obtain the epoxy resin / MC nylon 6 composite material.

Embodiment 3

[0022] Embodiment 3, in the reactor, add 200g caprolactam, under nitrogen protection, add 40g bisphenol A type epoxy resin, stir and mix, then add 5g4,4'-diaminodiphenyl sulfone (DDS), heat to 130 ℃, react at this temperature for 30min, then switch to the vacuum system, and dehydrate in vacuum at 130℃ for 20min; then release the vacuum, add 0.287g sodium methoxide, and react at a vacuum of 750mmHg, wait until the melt temperature rises to about 140℃, maintain 15min; after releasing the vacuum, quickly add 0.924g of 2,4-toluene diisocyanate, mix quickly and pour into a mold preheated to 165°C, polymerize in a constant temperature drying oven at 165°C for 30min, stop heating, and naturally cool to room temperature After that, demould to get the epoxy resin / MC nylon composite material.

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Abstract

The invention discloses a preparation method of an epoxy resin / MC nylon composite material; 100 weight portions of caprolactam is taken as the reference, and the weight portions of other components are as follows: 1 portion to 50 portions of epoxy resin, 0.005 portion to 20 portions of curing agent, 0.01 portion to 5 portions of catalyst and 0.01 portion to 5 portions of activating agent; (a) under the protection of nitrogen, the epoxy resin is added into caprolactam melt to be evenly stirred; (b) the curing agent is added to pre-cure the epoxy resin under 80 DEG C to 150 DEG C; (c) the catalyst and the activating agent are added in to initiate ring opening polymerization of caprolactam anion, to obtain the epoxy resin / MC nylon composite material. The preparation method has the advantages that: 1. the method has short gelation time, high polymerization speed, high monomer conversion rate, low water absorption and the like; 2. the method improves the deformation resistance of the MC nylon substrate, so that the tensile and impact strength of the composite material are greatly improved; 3. the heat resistant performance is greatly improved; 4. the method has low production cost and simple and convenient process, and is application to industrialized production.

Description

technical field [0001] The invention relates to a preparation method of MC nylon 6 composite material. Background technique [0002] MC nylon (monomer cast nylon) is a new type of engineering plastic developed by applying anionic polymerization technology in the 1950s. Its preparation method is to dehydrate the molten caprolactam under reduced pressure, and add a strong alkaline substance as a catalyst for further dehydration, and then activate it. Mix with the agent (such as isocyanate, etc.), and directly inject it into the mold preheated to a certain temperature. The material will undergo polymerization reaction quickly in the mold and be directly formed in the mold. Compared with nylon 6 prepared by hydrolysis and ring opening, MC nylon has the advantages of high polymerization degree, large molecular weight, high crystallinity, high mechanical strength, low water absorption, and good dimensional stability. In addition, MC nylon is suitable for preparing large-scale nyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08G69/24C08G69/18C08L63/00
Inventor 张平赵才贤易兰花陈广兵姜勇许福
Owner XIANGTAN UNIV
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