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A kind of preparation and application method of water-based modified graphene slurry

A water-based modification, graphene technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of restricting the application of EPS finished products, increasing the viscosity of the polymerization system, and prolonging the polymerization reaction time. Achieve the effect of solving the polymerization inhibition effect, improving the thermal insulation performance, and reducing the manufacturing cost

Active Publication Date: 2018-10-02
无锡云亭石墨烯技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

White material EPS is mainly used in the packaging of products and foods. Graphite EPS has gradually opened up its market for building exterior wall insulation due to its lower thermal conductivity than white material EPS. However, the low mechanical strength of EPS products currently limits the use of EPS products. In addition, the "Thirteenth Five-Year Plan" country also needs to improve the building energy-saving standards, which requires the development of EPS products with lower thermal conductivity. Graphene EPS came into being
[0004] During the application of graphene in the EPS industry, graphene is directly added to the EPS polymerization system. Due to the large specific surface area of ​​graphene and some groups on the edge of graphene, the polymerization inhibition effect will occur, resulting in prolonged polymerization reaction time. The process lasts for 20-30 hours, and the viscosity of the polymerization system increases accordingly, and in severe cases, the phenomenon of cauldron formation will directly occur

Method used

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  • A kind of preparation and application method of water-based modified graphene slurry
  • A kind of preparation and application method of water-based modified graphene slurry
  • A kind of preparation and application method of water-based modified graphene slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of modified graphene: 50g of graphene powder and 2.5g of sodium hexadecylbenzenesulfonate were ultrasonically pre-dispersed in deionized water, and then 2.5g of silane coupling agent KH550 and 5g of active calcium phosphate were added to modify graphene. Stirring and shearing dispersion for 2 hours, after modification, filter and dry to obtain modified graphene powder.

[0032] (1) Pre-dispersion: Proportioning by weight 90wt% deionized water, 1wt% polyethylene glycol 400 (400 is the molecular weight, the same below), 1wt% polyethylene wax, 5wt% ethylene glycol, added to the high-speed shear In the grinding machine, carry out pre-dispersion for 10 minutes, and control the speed at 5000r / min.

[0033] (2) Modified graphene slurry intermediate: gradually add 3wt% modified graphene powder into the pre-dispersion liquid, stir for 10 minutes until fully dispersed, and control the speed at 5000r / min.

[0034] (3) Grinding of modified graphene slurry: Finally, per...

Embodiment 2

[0037]Preparation of modified graphene: 50g of graphene powder and 0.5g of sodium dodecylbenzenesulfonate were pre-dispersed in deionized water by ultrasonic, and then 2g of silane coupling agent KH560 and 3g of active calcium phosphate were added to modify graphene Disperse, stir and shear to disperse for 2 hours, filter and dry after modification to obtain modified graphene powder.

[0038] (1) Pre-dispersion: Proportioning by weight 75.5wt% deionized water, 5wt% polyethylene glycol 800, 2wt% EAA, 0.5wt% EMAA, 4wt% ethanol, 2wt% glycerol, 1wt% n-butanol, add Into the high-speed shearing mill, carry out pre-dispersion for 20min, the speed control is 3500r / min.

[0039] (2) Modified graphene slurry intermediate: gradually add 10wt% modified graphene powder to the pre-dispersion liquid, stir for 20 minutes until fully dispersed, and control the speed at 3500r / min.

[0040] (3) Grinding of modified graphene slurry: Finally, high-speed shear grinding of graphene slurry is carrie...

Embodiment 3

[0043] Preparation of modified graphene: Ultrasonic pre-dispersion of 50 g of graphene powder and 1.5 g of sodium octadecylbenzenesulfonate in deionized water, and then adding 0.5 g of silane coupling agent KH570 and 4 g of active calcium phosphate to modify graphene Stirring and shearing dispersion for 2 hours, after modification, filter and dry to obtain modified graphene powder.

[0044] (1) Pre-dispersion: proportioning by weight 62wt% deionized water, 3wt% polyethylene glycol 2000, 5wt% polyethylene glycol 6000, 3wt% EVA, 2wt% EMA, 3wt% ethanol, 2wt% ethyl acetate , 5wt% propylene glycol, join in the high-speed shear grinder, carry out pre-dispersion 25min, speed control is 3000r / min.

[0045] (2) Modified graphene slurry intermediate: gradually add 15wt% modified graphene powder to the pre-dispersion liquid, stir for 25 minutes until fully dispersed, and control the speed at 3000r / min.

[0046] (3) Grinding of modified graphene slurry: Finally, high-speed shear grinding...

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Abstract

A method for preparing composite EPS through water-based modified graphene comprises the steps that pre-dispersion is conducted on water, a dispersant, a stabilizer and a cosolvent; modified graphene powder is added into pre-dispersed liquid to prepare an intermediate; high-speed shear grinding is conducted on modified graphene slurry; and graphene EPS polymerization and foaming plate-making are conducted. According to the invention, the modified graphene serves as a base material, the water serves as main solvent dispersion liquid, the environment-friendly effect is achieved, and the prepared graphene slurry is excellent in dispersion, good in storage stability and suitable for industrial production. The graphene slurry is mainly used for EPS polymerization, the strength of a modified graphene EPS molded polystyrene plate is improved by 200%-230% compared with the national standard, the heat conductivity coefficient is decreased by 10%-13% compared with the 032 level national standard, and a more excellent comprehensive mechanical property is shown. The preparation method for the modified graphene slurry opens up a novel achievable method for the downstream application of the graphene, develops the application of the graphene in the EPS field and makes a contribution to the national energy conservation cause.

Description

technical field [0001] The invention relates to the technical field of modified graphene materials, in particular to a preparation method and application method of water-based modified graphene slurry. Background technique [0002] Graphene is a two-dimensional crystalline material composed of closely packed carbon atoms. Because of its unique structure and excellent electrical, mechanical, optical, chemical and thermal properties, it has become a research hotspot for many people. [0003] EPS is expandable polystyrene. Polystyrene resin particles are used to add foaming agent, and heated at the same time to soften, generate gas, and form a foam with a hard closed-cell structure. Currently, there are two types of white material EPS and graphite EPS. product. The national standard GB / T 29906-2013 "Molded polystyrene board thin plaster exterior wall external insulation system material" in EPS molded polystyrene board tensile strength ≥ 0.1Mpa, 039 grade thermal conductivity ≤...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/06C08K9/04C08K9/02C08K3/04C08F112/08C08F2/44C08F2/18C08J9/20C08L25/06C09C1/46C09C3/04C09C3/12C09C3/06C09C3/08
CPCC01P2006/22C08F2/18C08F2/44C08F112/08C08J9/20C08J2203/14C08J2325/06C08K3/04C08K9/02C08K9/04C08K9/06C09C1/46C09C3/006C09C3/04C09C3/06C09C3/08C09C3/12
Inventor 侯树亭沈海斌侯成马翠
Owner 无锡云亭石墨烯技术有限公司
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