My thesis

I would like to post a part of my thesis and i would be happy if somone corrected that part, please!! It is a very difficult part for me 'cause i have to write that as a kind of an introduction. It's about chemistry..and i've never in my life had any relation to chemistry...here it is:

The coatings production runs without noticable chemical reactions. It’s more a sequence of optimal adjusted operations such as metering, mixing and testing. To understand the different issues that ***(a name here which i'm not allowed to post) has to deal with a short introduction into the different phases of coatings production is essential. Basically the production of coatings can be splittet into ten different steps which will be shortly explained in the following.

Step 1 – Preparation
Preparation means the mixing and homogenization of raw materials or semi-finished products such as the production of colourless coatings, thinners and several additives.

Step 2 – Dissolving
Dissolving is the addition of solid matters to a thinner by long agitation in a heatable kettle until the solid matters completely resolved. Further dissolving describes the process of fusioning solid matters in the molten mass.

Step 3 – Premixing
Premixing is the production of dispersable or grindable pastes which contain all additives, thinners, pigments and fillers. A homogenous paste reached by a good premixing is a condition for a high-quality-grinding.

Step 4 – Dispersing
Dispersing means to crush pigment particles into single primary particles by using shear forces and to envelop those with adhesives. The goal of dispersing is to reach a product that contains as much primary particles as possible. The different states of the pigment particles can be seen in the illustration below.

Step 5 – Grinding
Grinding is the dispersion of pigments by using mills. It needs to be done when the shear forces reached during dissolver dispersion are not strong enough to crush the pigment agglomerates into primary particles. For grinding in coatings production there can be used different mills.

Step 6 – Mixing
Mixing means to add the after the grinding still missing recipe elements.

Step 7 – Shading
Shading is the final adjustment of the grinded products’ colour or the manufacturing of a batch of different tinting coatings. The evaluation of the colour is usually done visually. Critical products such as automotive series or military camouflages need to have a certain infrared-remission value. Therefore colourmetric evaluation before releasing the product is unavoidable.

Step 8 – Tarnishing
Tarnishing is the addition of tarnishing mediums in grinded and mixed and products made of tinting coatings respectively. The effect of these mediums is based on a microscopical buffed coatings surface. The unevenness of the surface do not reflect the incident light (luster) but scatter it into different directions. The more uneven a surface the fainter the coatings film is.

Step 9 – Adjusting
Adjusting contains the setting of the products’ attributes such as pH-value, specific resistors and viscosity.

Step 10 – Filling
The filling is the last part in the production chain. Smallest failures can lead to fatal ramifications since the customer is the one who will realize them. For customer satisfaction being the prior target of the company the product has to pass a last quality control before it will be released.


THANK YOU!!!!