Polymer Obtained by the Polimerization of Hexagonal Boron Nitrite Nano Particles with Tetraethylorthosilicate Cross Linking Monomer

Technical Field The invention is related to a polymer which can be used without a limitation in kitchen goods, defence, automotive, pipe, metal and plastic industry, facing, construction, electrical products and all related sectors.

The invention is especially related to a polymer obtained by the polimerization of hexagonal boron nitrite nano particles with tetraethylorthosilicate cross linking monomer.

Prior Art

Today, polymers are used in various sectors, as additive and coating material.

Patent application TR2011/05384 is one of the patents present in the literature related with the subject. In said application, a phosphate layer or anodized layer is formed on the surface by the phosphatization process on the aluminium surface with phosphate/fluoride. Nano sized hexagonal boron nitrite is placed into said anodized layer. The process performed is the absorption/capturing of hexagonal boron nitrite particles by the phosphate or anodized layer. In said absorption/capturing process, no chemical bonding occurs. The hexagonal boron nitrite particles on the surface can be removed from the surface by being regenerated with proper reactives with acid or base. Also in patent application TR2011/05384, the nano sized hexagonal boron nitrite is absorbed in the anodized phosphate surface with the absorption method and thus, the movable metal part is lubricated. Thus, it is aimed to increase the abrasion and friction coefficients. The bond formed by anodized phosphate surface with hexagonal boron nitrite is a complex bond. Complex bonds are the weakest bonds among chemical bonds and they can be broken easily, they are weak against acid/base effect and the complex interaction formed on the surface can be eliminated easily. Therefore, since it is an oily material, only the physical properties of hexagonal boron nitrite are used, its mechanical and thermal features can not be used. Additionally, since the complex bond formed by hexagonal boron nitrite on the surface is very weak; it is not resistant to acid or base and thus, it can be removed from the surface easily. Another application related to the subject is WO 2010044535 A1. In this application, hexagonal boron nitrite is reacted with silane reactives such as methyltrimethoxysilane, tetramethoxysilane, trimethoxysilane or tetraethoxysilane in isopropanole in room temperature. Hexagonal boron nitride molecules are restrained by being wrapped and the obtained mixture is used in kitchen utensils by being coated onto aluminum and stainless steel. In said application, an inorganic mixture is coated onto aluminum or stainless steel surface as a stretch cover. The surface formed is an inorganic surface as mentioned in the document. It is not very different from the ceramic coating used in industrial kitchen utensils, the only difference is that, it additionally contains hexagonal boron nitride. As it is also mentioned in the document, due to the inorganic surface and an inorganic interaction, the rigidity of the obtained surface is excessive and its thermal resistance varies. Excessive expansion in winter causes cracks on the surface. Also in summer, stretching on the surface may cause contractions.

Consequently, an improvement was needed in the prior art because of the drawbacks mentioned above and the deficiency of the present solutions about the subject.

Object of Invention

The present invention is related to hexagonal boron nitride based polymer obtained by the polymerization of hexagonal boron nitride with a cross binding monomer, to be used as a coating material, meeting all the needs and eliminating all disadvantages mentioned above and providing some additional advantages.

The prior object of the invention is to provide a polymer which increases the thermal conductivity of the surface, forms a slippy and non-sticking surface, eliminates the surface toxicity, increases durability, provides surface stability and applied easily.

An object of the invention is to provide the polymerization of hexagonal boron nitride nano particules which are present as a web in the form of honeycomb and to obtain a polymer with a larger surface area by increasing the surface of the hexagonal boron nitride nano material. Another object of the invention is to provide a coating material which is more durable thanks to covalent bonds. By the virtue of this durable structure, no splitting and abrasion occurs at the surface. Another object of the invention is to use the polymer subject to the invention as an additive and/or coating material thanks to its thermal and electrical conductivity.

A similar object of the invention is to provide the usage of said polymer in defence industry thanks to improved impact resistance and elasticity of the material obtained by the layer formed on the surface due to the web structure of hexagonal boron nitride.

Another object of the invention is to have an organic surface and thus, a more natural structure, since the synthesized material is formed as a result of organic reactions. In order to realize the objectives mentioned above, the invention is a hexagonal boron nitride based polymer obtained by the polymerization of hexagonal boron nitride nano particles with a cross linking monomer.

The structural and the characteristic features and all advantages of the invention will be understood more clearly with the detailed description written below and the evaluation needs to be done by taking this detailed description into consideration.

Figures Assisting the Description of the Invention Figure-1 is the polymerization reaction and the chemical structure of the hexagonal boron nitride based polymer obtained by said reaction.

Detailed Description of the Invention In this detailed description, the preferred embodiments of the polymer subject to the invention, obtained by the polymerization of hexagonal boron nitride with a cross linking monomer are explained solely for a better understanding of the subject, without generating any restrictive effect.

The features of hexagonal boron nitride which provide the superior characteristics of the polymer subject to the invention are herein below: - The melting temperature of hexagonal boron nitride is 2600°C. It loses its stability at 1000°C in atmospheric conditions, at 2200°C under argon gas and at 2400°C under nitrogen gas.

- It has the lowest density among ceramic materials (2,27 g/cm3).

- It is resistant to very high temperatures (up to 3000°C under inert atmosphere, and 1000°C under air).

- It has a high thermal shock endurance (it is resistant to thermal shocks between 0- 2000°C).

- Its wetting characteristic (by various molten metals or cinder and molten glass) is low. - It has a perfect electric insulation and heat conductivity.

- It has perfect lubrication features.

- It reflects UV fine.

The polymer material subject to the invention may be coated onto various metal and polymer materials as a bearing material. It may be coated to metal surfaces such as aluminum (Al), iron (Fe), Cupper (Cu), zirconium (Zr), silisium (Si) by activating the surfaces with hydroxyl groups (-OH). Additionally, it may also be coated onto plastic materials such as polyethylene, polypropylene by being modified with hydroxyl (-OH) groups. The bearing material aluminum plate has positive features such as easy processing, good thermal conductivity and easy shaping since it is a soft metal. The thickness of the qualified and sturdy aluminum plate is 3-4 mm which is ideal for processing and shaping.

The weight percentages of the materials needed for the polymerization reaction are given in Table 1.

Table 1 : Percentages of the materials needed for polymerization by weight

Preferred Amount (%) By Usable Amount (%) by

Material's Name

Weight Weight

Hexagonal Boron Nitrite 38 30-43

Tetraethylorthosilicate 59 56-65

Nal 3 1-4 The obtainment method of hexagonal boron nitrite based polymer subject to the invention and its binding onto a bearing metal surface is described below:

First of all; hexagonal boron nitride is synthesized at 1200-1600°C, under vacuum and inert atmosphere. First, hexagonal boron nitride is mixed in ethanol homogenously and tetraethylorthosilicate is added thereinto dropwise. The reaction mixture is mixed in room temperature for 24 hours by a magnetic mixer. Throughout the reaction, synthesized nano sized hexagonal boron nitride is first reacted with Nal in ethanol. As a result of the reaction, - OH (hydroxyl) groups are activated and become -0-Na+. The activated -0-Na+ end of hexagonal boron nitride is interacted with tetraethylorthosilicate and thus, cross linked polymer is obtained. Hexagonal boron nitrite is captured by tetraethylorthosilicate and used in surface coating.

During said processes, the surface of aluminum is activated by proper reactives (by acid/base) and thus, hydroxyl (-OH) groups are formed on the surface. The aluminum surface is silaned by interacting the hydroxyl (-OH) groups on the activated aluminum surface with the tetraethylorthosilicate in ethanol. After this process, a layer is formed by interacting the obtained tetraethylorthosilicate with the cross linked hexagonal boron nitrite polymer. Thus, a strong covalent boding is obtained on the surface and the coating process is completed.

Aluminum plate is solely used as the bearing metal. Thus, a web layer with a thickness of approximately 10 microns is formed on the surface of aluminum plate which is completely a new product and does not reflect the characteristics of bearing material.

Since the obtained hexagonal boron nitride based polymer has a web structure, it has different characteristic features different then the characteristic features of the metal material used. These features are:

❖ Elasticity,

❖ Improved thermal properties,

❖ Resistance against impact,

❖ Electrical and thermal conductivity,

❖ Non-stick

By gaining thermal and electrical conductivity features, the obtained product is used as a coating material in industrial kitchen utensils, at the inner parts of household electrical appliances, sheet metals, acid and base tanks, medical materials, cutting tools and hardware.

The web structure of hexagonal boron nitride formed on the surface provides elasticity to the material and increases the resistance against impacts which makes it usable in the defence industry. For example, when a weapon is fired to an armor material present on a military vehicle, the bullet penetrates to the metal. In here, the hexagonal boron nitride polymer added to the ingredients during the processing of metal acts as a web and decelerates the speed of the bullet and thus, the bullet stays on the metal or bounces therefrom. Additionally, the melting point of hexagonal boron nitrite is 2600°C. It loses its stability at 1000°C in atmospheric conditions, at 2200°C under argon gas and at 2400°C under nitrogen gas. Thanks to these features, it increases the thermal properties of the metal in which it is included. Due to such specific features it may be used in various fields such as the production of military vehicle armors, ammunition, mechanisms and gun barrels in defence industry.

Hexagonal boron nitride obtained with the features mentioned above is used in the surface coating processes of metals other than aluminum or epoxy polymers (automotive industry) and thus, by manufacturing a completely new material having features different then the features of bearing material, a new product having better and superior features compared to present material is obtained.

As also mentioned above, the polymer obtained is used in kitchen goods, defence, automative, pipe, metal and plastic industry, facing, construction, electrical products and similar industries. However, the usage of the polymer subject to the invention is not limited with these industries and it may be used in many other areas.