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Film-forming binders containing nanoscale particles and featuring enhanced scratch resistance and flexibility, processes for their preparation, and high-transparency coating materials containing them

A binder and nano-scale technology, applied in coatings, polycarbonate coatings, polyester coatings, etc., can solve the problems of decreased transparency and clarity, loss of transparency and clarity, etc., and achieve the effect of high transparency

Inactive Publication Date: 2008-04-30
GOLDSCHMIDT CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If agglomerated fillers with at least partly micron-scale dimensions are used, although an increase in hardness can be achieved, transparency and especially clarity are strongly reduced due to light scattering
Systems composed of combinations of nanoscale and microscale raw materials lose, if not to a great extent, their transparency and clarity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0119] A suitable method for preparing particles with irregular fractal structure is the combustion pyrolysis method of Degussa AG to prepare calcined oxides. The irregular fragment-shaped structure may be formed, for example, by aggregation of spherical, ellipsoidal crystals or irregularly shaped particles during the preparation process, for example, during combustion pyrolysis in a hot flame, or directly after the hot flame. The particles having an irregular fragmented structure may, for example, be composed of aggregates of at least two up to several hundred spherical, ellipsoidal crystals or irregularly shaped primary particles. However, particles with irregular fragmented structures prepared according to other methods are also suitable. Examples of other suitable methods are precipitation, hydrothermal or plasma methods.

[0120] The particles of the invention are compatible with the polymer matrix by surface modification. The term "surface modification" includes post-oxidati...

Embodiment 1

[0170] Preparation and properties of suspensions and comparative suspensions

[0171] Suspension 1A (S1A):

[0172] 15% AEROXIDE(R) Alu 65, 10% Hostaphat OPS (octylphosphonic acid), with Al 2 O 3 Calculated in xylene;

[0173] A 100-liter stainless steel metering container equipped with a jet mixer was filled with 58.45 kg of xylene and 1.05 kg of Hostaphat OPS was dissolved by stirring. Next, in the running dispersion equipment Ystral Conti-TDS 3 (stator slots: 4mm wheels and 1mm wheels, rotor / stator spacing about 1mm) and under shear conditions, the manufacturer is Degussa's 10.5kg AEROXIDE(R) Alu 65(BET 65m 2 / g) Put it into the measuring container. After the addition is complete, shear for another 30 minutes under the condition of 3000 revolutions / min.

[0174] The pre-dispersion was passed through a high-energy grinder Sugino Ultimaizer HJP-25050 in two passes under a pressure of 2500 bar and passed through a diamond-shaped nozzle with a diameter of 0.25 mm, thereby further i...

Embodiment 2

[0212] Painting, preparation and performance

[0213] The nanoparticle suspension is mixed with resin, curing agent and other additives, if necessary, it can be dispersed once with a dissolver, left to stand for degassing, coated on the sheet and thermally cured. Choose the curing temperature / time combination so that it can pass the MEK test, but it will not turn yellow due to over-curing. Due to the addition of nanoparticles, the curing time may be required to be slightly extended compared to the unmodified paint. It is usually cured at 160°C and a curing time of 10 to 30 minutes. The various compositions of the present invention are listed in the table below. The paint of the present invention consists of, for example, hydroxyl-functional polyesters, phenolic resins, solvent mixtures, curing catalysts, flow aids, and surface-modified nano-particle fillers (according to one of the above-mentioned particle suspensions / dispersions).

[0214] Examples of paints composed of polyester...

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Abstract

Film-forming binder comprising a matrix based on one polymer or on a plurality of polymers and, on the basis of 100% by weight of the total binder, a stabilized suspension of nanoscale particles, in an amount of 0.5% to 25% by weight, measured as the solids fraction of the suspension, the binder being distinguished by the fact that the suspension of the particles is obtainable by a) grinding the particles with addition of a solvent in a high-pressure mill which under a pressure in the range from > 500 - approximately 10000 bar breaks down agglomerates and / or aggregates of the particles into nanoscale fragments; and b) adding one or more dispersing additives to stabilize the surface of the ground particles, the dispersing additive(s) being present in an amount of 1 to 25 parts by weight, based on 100 parts by weight of the particles. Process for preparing the film-forming binder and its use in coating materials. Coating materials containing the binder produce transparent coatings with high scratch resistance and flexibility.

Description

Technical field [0001] The invention relates to a paint binder containing nano-scale particles and having higher scratch resistance and flexibility, a preparation method thereof and a high-transparent paint containing the same. Background technique [0002] For example, polyester paints used to coat metal strips are characterized by high flexibility and moderate scratch resistance. Flexibility can be checked in particular by the T-bend test, in which the coated strip is bent 180°. Strips coated with isocyanate-cured polyester paint can pass the test without cracking or delamination in the paint layer. In production practice, there is an increasing need for more scratch-resistant coatings, but it is required that their flexibility will not be weakened or only minimally weakened. In order to improve the scratch resistance, the degree of crosslinking can be increased, which in turn will significantly reduce the flexibility. Filling the paint with particulate fillers can also success...

Claims

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Application Information

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IPC IPC(8): C09D7/12C09D133/08C09D167/00C09D171/00C09D169/00C09D175/04C09D7/80
CPCC08K3/22C08K9/04C09D7/14C09D7/1283C09D7/1266C09D7/1275C09D7/1291C09D7/62C09D7/67C09D7/68C09D7/69C09D7/70C09D7/80
Inventor M·巴特曼T·布兰德P·卡瓦莱罗T·哈斯柯尔L·海恩R·科沙贝克W·洛茨B·米勒
Owner GOLDSCHMIDT CHEM CORP
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