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Preparation method of sericite-polycaprolactam composite material

A technology of polycaprolactam and composite materials, applied in the field of preparation of polycaprolactam composite materials, can solve the problems of high water absorption, easy agglomeration of fillers, low heat distortion temperature, etc., and achieve the effect of improving performance and affinity

Active Publication Date: 2012-07-18
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its polar amide bond, high water absorption and low heat distortion temperature, the further application of nylon 6 is restricted.
Filling modification with inorganic fillers, such as kaolin, wollastonite, talcum powder, etc., can reduce the cost of nylon 6 and improve dimensional stability, but it has a great impact on the mechanical properties of nylon 6, and the existing surface modification technology still exists The problem of excessive dosage and poor modification, fillers are easy to agglomerate
Since the interlayer spacing of layered silicate is on the order of 1 nanometer, it is still difficult to achieve the desired effect by using caprolactam to polymerize between layers of layered silicate to form a composite material for modification.

Method used

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  • Preparation method of sericite-polycaprolactam composite material
  • Preparation method of sericite-polycaprolactam composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 100g of sericite sieved through 800 mesh sieve was blended with 2g of coupling agent N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 4g of distilled water and 1g of fuming hydrochloric acid for 5min to obtain Coupling agent-activated sericite, for subsequent use;

[0028] (2) Get 10g active sericite, add 200g distilled water and stir to form a stable suspension system, add 200g caprolactam and stir until forming a stable colloidal system;

[0029] (3) After vacuum dehydration until the moisture content is less than 0.5%, heat to 250°C for polymerization for 6 hours, add 0.2g of 6-aminocaproic acid, and then polymerize for 6 hours;

[0030] (4) Pressurized discharge, mechanical crushing, and hot water washing three times to remove equilibrium monomers and oligomers, and place in a vacuum drying oven at 80°C to constant weight. The test results of its mechanical properties are shown in Table 1.

Embodiment 2

[0032] (1) 100 g of sericite sieved through a 1200 mesh sieve was mixed with 1 g of coupling agent N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 2 g of distilled water, and 0.5 g of fuming hydrochloric acid for 7 minutes to obtain Sericite activated by a coupling agent, for subsequent use;

[0033] (2) Get 20g active sericite, add 200g distilled water and stir to form a stable suspension system, add 200g caprolactam and stir until forming a stable colloidal system;

[0034] (4) After vacuum dehydration until the moisture content is less than 0.5%, heat to 250°C for polymerization for 6 hours, add 0.2g of 6-aminocaproic acid, and then polymerize for 6 hours;

[0035] (4) Pressurized discharge, mechanical crushing, and hot water washing three times to remove equilibrium monomers and oligomers, and place in a vacuum drying oven at 120°C to constant weight. The test results of its mechanical properties are shown in Table 1.

Embodiment 3

[0037] (1) Blend 100g of 3000 mesh sericite with 0.2g of coupling agent N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 2g of distilled water and 0.1g of fuming hydrochloric acid for 10min to obtain The sericite activated by the joint agent is for subsequent use;

[0038] (2) Get 30g active sericite, add 200g distilled water and stir to form a stable suspension system, add 200g caprolactam and stir until forming a stable colloidal system;

[0039] (3) After vacuum dehydration until the moisture content is less than 0.5%, heat to 250°C for polymerization for 6 hours, add 0.1g of 6-aminocaproic acid, and polymerize for another 6 hours;

[0040] (4) Pressurized discharge, mechanical crushing, and hot water washing three times to remove equilibrium monomers and oligomers, and place in a vacuum drying oven at 120°C to constant weight. The test results of its mechanical properties are shown in Table 1.

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Abstract

The invention discloses a preparation method of a sericite-polycaprolactam composite material. The preparation method comprises the following steps of: (1) mixing sericite, a coupling agent, water and fuming hydrochloric acid in a certain ratio to obtain sericite activated by using the coupling agent; (2) adding distilled water, stirring at a high speed to form a stable suspension system, adding caprolactam, and stirring till a stable colloid system is formed; (3) dehydrating in vacuum, heating, polymerizing for a certain period of time, adding a catalyst and polymerizing; and (4) discharging under increased pressure, mechanically smashing, washing with hot water for three times to remove a balance monomer and a low polymer, and drying to constant weight to obtain the sericite-polycaprolactam composite material. The material surface of the sericite-polycaprolactam composite material prepared with the method is uniformly covered with polycaprolactam, and a special structure connected through a covalent bond of the coupling agent between the polycaprolactam and the sericite is formed. The composite material has excellent mechanical property, heat resistance and product size stability.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a preparation method of a polycaprolactam composite material. Background technique [0002] Polycaprolactam (Nylon 6) is a widely used engineering plastic, which has the advantages of high mechanical strength, wear resistance, and good oil resistance. It has a wide range of applications in the automotive industry, construction, and building materials and furniture. However, due to its polar amide bond, high water absorption and low heat distortion temperature, the further application of nylon 6 is restricted. Filling modification with inorganic fillers, such as kaolin, wollastonite, talcum powder, etc., can reduce the cost of nylon 6 and improve dimensional stability, but it has a great impact on the mechanical properties of nylon 6, and the existing surface modification technology still exists If the dosage is too high and the modification is not good, the filler is eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/16C08K9/06C08K3/34
Inventor 费彬
Owner HEFEI GENIUS NEW MATERIALS