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Enhanced scratch resistance of articles containing a combination of nano-crystalline metal oxide particles, polymeric dispersing agents, and surface active materials

A technology of surface active substances and nanocrystalline particles, applied in the direction of nanostructure manufacturing, nanotechnology for materials and surface science, devices for coating liquids on surfaces, etc., can solve problems such as light scattering and turbidity

Inactive Publication Date: 2007-05-16
NANOCO TECH LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, typically high concentrations of silica particles are required to enhance scratch resistance, and such high silica concentrations can lead to undesired changes in other properties such as formulation viscosity, etc.
Alumina particles are able to provide greater scratch resistance than silica particles, but the high index of refraction of this alumina causes a lot of light scattering and clouding compared to similarly sized particles with a lower index of refraction. Usable concentrations are limited to less than optimal concentrations required to achieve scratch resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0027] The invention is illustrated by the following examples without limiting them in any way.

[0028] Steel wool scratch test method : For Examples 1-3, each membrane was rubbed 200 back and forth with a grade 0 2" x 2" steel wool pad, and then the increase in transmitted haze due to scratching was measured on a BYK-Gardner Haze-Gard Plus instrument , so that these films were tested for scratch resistance. Apply 40g / cm to the steel wool pad 2 pressure. For Example 4, the steel wool pad was subjected to 8 g / cm 2 pressure, and friction back and forth 50 times. The scratch resistance of each film was quantitatively measured in terms of suppression of scratch-induced haze. The Scratch Resistance Parameter (SRP) was calculated by dividing the haze increase measured for the neat film (Film A in each example) by the haze increase measured for the other films in the same example. An SRP of 1.0 indicates no enhancement in scratch resistance relative to the control in each exam...

Embodiment 1

[0033] A UV-cured polyurethane-based coating formulation was prepared comprising 30 wt% of Sartomer SR-368, 30 wt% of Sartomer CD-501, 30 wt% of Sartomer SR-238 and 10 wt% of Sartomer SR-494, and 5 wt% of Benzophenone and 5wt% Irgacure 651 were used as curing agents. Alumina nanoparticles were dispersed in Sartomer SR-238 to a concentration of 30 wt% using the sources and concentrations of polymeric dispersants and surface actives listed in the table below. All concentrations are expressed as weight percent (wt %) of total resin solids in the coating. These dispersions were added to UV curable formulations, stirred vigorously, and then used to make 1 mil films on glass slides. These films were cured with 3 passes of UV irradiation at 0.6 J / shot. Each cured film was subjected to an initial haze measurement and an SRP measurement according to the Steel Wool Scratch Test method defined above.

[0034] A

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Embodiment 2

[0040] Prepare the epoxy compound-based coating formulation of ultraviolet curing, it comprises the Sartomer CN-120 of 30wt%, the Sartomer CD-501 of 30wt%, the SartomerSR-238 of 30wt% and the Sartomer SR-494 of 10wt%, in this composition Add 5wt% benzophenone and 5wt% Irgacure 651 as curing agent. Alumina nanoparticles were dispersed in Sartomer SR-238 to a concentration of 30 wt% using the sources and concentrations of polymeric dispersants and surface actives listed in the table below. All concentrations are expressed as weight percent (wt %) of total resin solids in the coating. These dispersions were added to the UV curing formulation, stirred vigorously, and then used to make 1 mil films on glass slides. These films were cured with 3 passes of UV irradiation at 0.6 J / shot. Each cured film was subjected to an initial haze measurement and an SRP measurement according to the Steel Wool Scratch Test method defined above.

[0041] A

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Abstract

A film forming composition comprises a resin, a plurality of nanoparticles, a surface active material and a polymeric dispersant. The film forming composition is substantially transparent and is adapted to be combined with a substrate to enhance abrasion resistance. The film forming composition may be used with wood objects including furniture, doors, floors, for architectural surfaces, for automotive articles and finishes, for metal coatings and coil coatings, for plastic articles, and for wipe-on protective treatments.

Description

technical field [0001] The present invention relates to film-forming mixtures, and more particularly, to nanoparticle-based additives for use with film-forming mixtures to enhance scratch resistance. Typical film-forming mixtures include polymer-based coatings applied to substrates to protect them from scratches, but polymer articles manufactured by cold-curing, extrusion, coextrusion, or casting techniques can also benefit from this technique. Typically, these coatings and / or polymeric articles are transparent. Background technique [0002] The prior art uses two approaches to enhance the scratch resistance of polymeric coatings: (1) using additives to enhance the surface slip of the coating (Method 1), or (2) adding ceramic particles to enhance the hardness of the coating (Method 2 ). [0003] Method 1 reduces the surface energy of the coating and enhances the surface sliding property by adding additives (such as polysiloxane, wax or fluorine-containing substances) to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D7/14B05D7/06B05D1/36B05D3/02B05D3/06C03C17/00C09D7/45C09D7/47C09D7/61C09D7/65G03C1/76
CPCC08J3/2053B05D2601/26B82Y30/00B05D3/0254B05D2203/35B05D2601/20C03C2217/475C09D7/1216B05D7/06B05D7/14C09D5/00B05D3/067C08K3/22B05D2601/24C09D7/1291C03C2217/445B05D5/00C09D175/16C03C17/007C09D7/61C09D7/70C09D7/45C09D7/65C09D7/47C08L2666/54G03C1/76B82B3/00B82B1/00
Inventor R·H·凯顿P·默里P·伦茨K·舒尔特M·格伦德克迈尔T·萨维特维斯基
Owner NANOCO TECH LTD
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