Preparation and Properties of Water-Based Solar-Reflective Coatings with Color Hollow Ceramic Microsphere

2011 ◽  
Vol 687 ◽  
pp. 734-738 ◽  
Author(s):  
Pei Wang ◽  
Xia Zhen Zhang ◽  
Zhi Yong Wei ◽  
Wen Yan Lv ◽  
Lian Liu ◽  
...  
Keyword(s):  
Base Layer ◽  
Butyl Methacrylate ◽  
Emulsion Copolymerization ◽  
Water Based ◽  
New Type ◽  
Polymerization Condition ◽  
Coated Surface ◽  
Reflective Coatings ◽  
Micro Sphere ◽  
Insulating Properties

We have developed a system of solar reflective coatings that can reflect the sunlight then reduce the temperature of coated surface. The base layer material, fluorinated polystyrene-acrylate copolymers water-based emulsion was firstly prepared with hexafluoro butyl methacrylate(HFBA), styrene(St), butyl acrylate(BA), methyl methacrylate (MMA) by pre-emulsion copolymerization method. The effect on copolymerization and emulsion properties were investigated, and the polymerization condition was optimized. A hollow ceramic micro-sphere was used as the main reflective functional fillers in the system. We had a test on the practical heat-insulating properties on a prototype device. The result showed that temperature difference of the surface was reached as 6.5 °C. The new type of reflective coatings also has good stability and durability.

A Study of Thermal Performance on Cool Colorful Water-Based Reflective Coatings for Building

2011 ◽  
Vol 250-253 ◽  
pp. 536-539
Author(s):  
Pei Wang ◽  
Wen Yan Lv ◽  
Zhi Yong Wei ◽  
Xia Zhen Zhang ◽  
Lian Liu ◽  
...  
Keyword(s):  
Comparative Study ◽  
Surface Temperature ◽  
Thermal Performance ◽  
Temperature Difference ◽  
Surface Temperatures ◽  
Water Based ◽  
Reflective Coatings ◽  
Micro Sphere

This paper presented the results of a comparative study aiming to investigate the effect of reflective coatings on lowering surface temperatures of matrix. Moreover, the important factors of the amount and the color of colored hollow-ceramic micro sphere were discussed. It was demonstrated that the use of reflective coatings could reduce a white surface temperature by 6.5 °C compared to a sample. The temperature difference became to reduce while the color of coatings turned to dark from the white to the yellow.

scholarly journals Computational Modeling of Hybrid Sisko Nanofluid Flow over a Porous Radially Heated Shrinking/Stretching Disc

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1242
Author(s):  
Umair Khan ◽  
Aurang Zaib ◽  
Anuar Ishak ◽  
Fahad S. Al-Mubaddel ◽  
Sakhinah Abu Bakar ◽  
...  
Keyword(s):  
Differential Equations ◽  
Flow Problem ◽  
Shear Thickening ◽  
Hybrid Nanofluid ◽  
Nanofluid Flow ◽  
Shear Thinning Fluids ◽  
Water Based ◽  
New Type ◽  
The Impact ◽  
The Magnetic Field

The present study reveals the behavior of shear-thickening and shear-thinning fluids in magnetohydrodynamic flow comprising the significant impact of a hybrid nanofluid over a porous radially shrinking/stretching disc. The features of physical properties of water-based Ag/TiO2 hybrid nanofluid are examined. The leading flow problem is formulated initially in the requisite form of PDEs (partial differential equations) and then altered into a system of dimensionless ODEs (ordinary differential equations) by employing suitable variables. The renovated dimensionless ODEs are numerically resolved using the package of boundary value problem of fourth-order (bvp4c) available in the MATLAB software. The non-uniqueness of the results for the various pertaining parameters is discussed. There is a significant enhancement in the rate of heat transfer, approximately 13.2%, when the impact of suction governs about 10% in the boundary layer. Therefore, the heat transport rate and the thermal conductivity are greater for the new type of hybrid nanofluid compared with ordinary fluid. The bifurcation of the solutions takes place in the problem only for the shrinking case. Moreover, the sketches show that the nanoparticle volume fractions and the magnetic field delay the separation of the boundarylayer.

Light-Weight and High Thermal Insulating EPDM Composites Modified with Pretreated Hollow Phenolic Micro-Spheres

2013 ◽  
Vol 750-752 ◽  
pp. 140-145
Author(s):  
Zi Gao Zeng ◽  
Xiao Long Jia ◽  
Xiao Ping Yang ◽  
Jun Yi Zheng ◽  
Wu Sheng Li
Keyword(s):  
Specific Gravity ◽  
High Performance ◽  
Layer Structure ◽  
Light Weight ◽  
Insulating Materials ◽  
Thermal Insulating ◽  
Uniform Dispersion ◽  
Micro Sphere ◽  
New Generation ◽  
Insulating Properties

High performance thermal insulating ethylene-propylene-diene monomer (EPDM) composites were obtained with the addition of hollow phenolic micro-sphere. The effects of the pretreatment and content of micro-sphere on various properties of EPDM composites were evaluated. Experimental results showed that thermal conductivity and specific gravity of EPDM composites significantly decreased, which was due to the intact and uniform dispersion of pretreated micro-sphere throughout the EPDM matrix. With the content increasing of pretreated micro-sphere, the specific gravity of EPDM composites linearly decreased while the thermal stability increased. Specifically, EPDM composites showed the three-layer structure after ablation and the addition of pretreated micro-sphere distinctively enhanced thermal insulating properties of EPDM composites, which was attributed to multi-type heat conductivity resulted from hollow micro-spheres. Hollow phenolic micro-sphere exhibited great potential in preparing new generation of light-weight and high thermal insulating materials.

Water-Based Coatings for Building Part I: Preparation and Physical Properties of Polyacrylate-Siloxane Emulsion

2012 ◽  
Vol 174-177 ◽  
pp. 520-523 ◽  
Author(s):  
Pei Wang ◽  
Xia Zhen Zhang ◽  
Li Na Heng ◽  
Teng Yu ◽  
Xie Wei Chen ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Physical Properties ◽  
Optimal Conditions ◽  
Pencil Hardness ◽  
Emulsion Copolymerization ◽  
Stirring Rate ◽  
Water Based ◽  
Acrylate Emulsion ◽  
Vinyl Triethoxysilane ◽  
Silicone Acrylate

This study is to report the synthesis of polyacrylate-siloxane latex with vinyl triethoxysilane(DB-151), methyl methacrylate(MMA) acrylic acid(AA), butyl acrylate(BA) by emulsion copolymerization and characterized by FTIR. The physical properties are also analysized by water absorption, pencil hardness, circle adhesion method, etc.. The polymerization factors for emulsion had been discussed in several aspects. The results showed that the optimal conditions for synthesizing silicone-acrylate emulsion were of DB -151content of 6%~8%, emulsifier OP-10/SDS/ DNS-458 ratio:2/1/1, in stirring rate 450 r/min in the period of disperse and emulsification, stirring rate 200 r/min in the period of synthesis, with reaction temperature 75°C.

A study on fullerene–acrylamide copolymer nanoball—a new type of water-based lubrication additive

Wear ◽  
2005 ◽  
Vol 258 (11-12) ◽  
pp. 1625-1629 ◽  
Author(s):  
Guichang Jiang ◽  
Wenchao Guan ◽  
Qixin Zheng
Keyword(s):  
Water Based ◽  
New Type ◽  
Lubrication Additive

Research and Development of a New Type of Water-Based Drilling Fluid

2012 ◽  
Vol 486 ◽  
pp. 464-471
Author(s):  
Kai He Lv ◽  
Tao Shi ◽  
Xue Dong Wu
Keyword(s):  
Drilling Fluid ◽  
Solid Content ◽  
Functional Treatment ◽  
Soluble Salts ◽  
Fluid System ◽  
Water Based ◽  
Treatment Agent ◽  
New Type ◽  
Repeated Use ◽  
Filtration Properties

To solve the problems of conventional water-based drilling fluid, a new type of water-based drilling fluid system that comprises of water, multi-functional treatment agent and soluble salts is developed. Multi-functional treatment agent provides the necessary properties and soluble salt maintains the required density. The composition of the drilling fluid is simple and it is easy to maintain. This new drilling fluid has the advantages of good rheology and filtration properties, strong plugging and inhibiting abilities, low solid content, pollution-free, wide adaptability, easy preparation and repeated use. It is a new type of drilling fluid system.

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