Preparation method of nano silicon dioxide reinforced nylon 6 composite

A nano-silica and composite material technology is applied in the field of preparation of nano-silica reinforced nylon 6 composite materials, which can solve problems such as nanoparticle agglomeration, and achieve the effects of improving interface bonding force, enhancing toughness and reducing agglomeration effect.

Inactive Publication Date: 2017-05-31
GUANGDONG JUHANG INST FOR ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the traditional nanoparticle addition method easily leads to the agglomeration of nanoparticles in the reactor, the present invention provides a preparation method of nano-silica reinforced nylon 6 composite material

Method used

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  • Preparation method of nano silicon dioxide reinforced nylon 6 composite
  • Preparation method of nano silicon dioxide reinforced nylon 6 composite
  • Preparation method of nano silicon dioxide reinforced nylon 6 composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Stir 186mL of ethyl silicate, 59mL of water, and 59mL of absolute ethanol in a 50°C water bath, add 0.002mol of catalyst hydrochloric acid, and continue stirring for 1 hour to prepare a clear blended solution;

[0025] Step 2: Add 2500g of caprolactam, stir evenly, and gel for 5 hours at a system temperature of 75°C;

[0026] The third step: at a system temperature of 235°C and a system pressure of 0.7 MPa, the ring-opening hydrolysis and prepolymerization of caprolactam are carried out, and at the same time, the gel dehydration of the silicate compound is carried out, and the polymerization time is 2 hours;

[0027] Step 4: Carry out reduced-pressure compression polymerization of caprolactam at a system temperature of 240°C and a system vacuum of 0.1 MPa, and the polymerization time is 4 hours;

[0028] Step 5: Cool and break the prepolymer obtained by polymerization, add 0.024mol of chain extender glycidyl methacrylate, and 0.005mol of molecular weight regulat...

Embodiment 2

[0030]Step 1: Stir 600mL of ethyl silicate, 193mL of water, and 290mL of acetone in a 60°C water bath, add 0.003mol of catalyst hydrochloric acid, and continue stirring for 1.5h to prepare a clear blend solution;

[0031] Step 2: Add 4000g of caprolactam, stir evenly, and gel for 4 hours at a system temperature of 75°C;

[0032] The third step: at a system temperature of 250°C and a system pressure of 0.8 MPa, the ring-opening hydrolysis and pre-polymerization of caprolactam are carried out, and at the same time, the gel dehydration of silicate compounds is carried out, and the polymerization time is 2.5 hours;

[0033] Step 4: Carry out reduced-pressure compression polymerization of caprolactam at a system temperature of 240°C and a system vacuum of 0.1 MPa, and the polymerization time is 4.5 hours;

[0034] Step 5: Cool and break the prepolymer obtained by polymerization, add 0.024mol of chain extender 1,6-hexamethylene diisocyanate, 0.005mol of molecular weight regulator et...

Embodiment 3

[0036] Step 1: Stir 500mL of ethyl silicate, 161mL of water, and 120mL of n-butanol in a 55°C water bath, add 0.006mol of a catalyst sodium chloride aqueous solution, and continue stirring for 1.5h to prepare a clarified blended solution;

[0037] Step 2: Add 7000g of caprolactam, stir evenly, and gel for 4 hours at a system temperature of 65°C;

[0038] The third step: at a system temperature of 215°C and a system pressure of 0.6 MPa, the ring-opening hydrolysis and pre-polymerization of caprolactam are carried out, and at the same time, the gel dehydration of the silicate compound is carried out, and the polymerization time is 2 hours;

[0039] Step 4: Carry out reduced-pressure compression polymerization of caprolactam at a system temperature of 255°C and a system vacuum of 0.08 MPa, and the polymerization time is 3 hours;

[0040] Step 5: Cool and break the prepolymer obtained by polymerization, add 0.048mol of chain extender glycidyl methacrylate and 0.015mol of molecular...

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Abstract

The invention belongs to the technical field of polymeric nanocomposites and particularly relates to a preparation method of a nano silicon dioxide reinforced nylon 6 composite. The preparation method comprises the following steps: through a sol-gel reaction process of silicate compounds, performing hydrolysis, dehydration and condensation polymerization of the silicate compounds in the presence of a catalyst to generate nanoscale silicon dioxide in situ; performing ring-opening hydrolysis and condensation polymerization of caprolactam to obtain a precursor of certain molecular weight; adding a chain extender and a molecular weight regulator; and preparing an in-situ nano silicon dioxide reinforced nylon 6 composite by a reactive extrusion method of a twin-screw extruder. In the invention, the problem of dispersion of nanoscale additives in a polymer melt is solved, so the molecular weight of nylon 6 is adjustable; and the nanoparticle reinforced nylon 6 composite has excellent comprehensive performance and good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of polymer nano composite materials, and in particular relates to a preparation method of nano silicon dioxide reinforced nylon 6 composite materials. Background technique [0002] Nanoparticles refer to particles smaller than 100nm in at least one dimension. They are a new generation of materials composed of nanoparticles whose size is between atoms, molecules and macroscopic systems. They are predicted to be "the most promising materials" in the 21st century. The use of nanomaterials to modify polymer materials plays an important role in improving the strength, stiffness, toughness, barrier properties and dimensional stability of polymer materials. In the study of nano-modification of polymer materials, the degree of dispersion of nano-materials has a decisive impact on the modification effect of polymer materials. The traditional way of adding nanoparticles, that is, placing nanoparticles and polymer mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/48C08G69/14C08G69/16C08K3/36
CPCC08G69/48C08G69/14C08G69/16C08K3/36C08K2201/011
Inventor 甄智勇魏珊珊陈旭东吴浪汤立文李梦燃袁琴
Owner GUANGDONG JUHANG INST FOR ADVANCED MATERIALS CO LTD
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