THEORETICAL ASPECTS IN THE FORMATION OF
PEDAGOGICAL SCIENCES
International scientific-online conference
134
INCREASE THE DURABILITY OF COMPOSITE POLYMER AND
PAINT-VARNISH MATERIALS AND COATINGS
Ahadjon Ulmasov Akramjon o‘g‘li
Assistant department of “Mechanical Engineering and Automation”
Sayfiyev Behzod Xusan ugli
Student
Fergana Polytechnic Institute, Fergana street 86, Fergana region, Uzbekistan.
ahadjonulmasovuz@gmail.com , a.a.ulmasov@ferpi.uz
ORCID: 0000-0002-9333-7125
https://doi.org/10.5281/zenodo.13377639
Abstract:
In polymer and paint coatings on a rigid substrate, internal
stresses act, which have a significant impact on their durability.
Keywords:
polymer, temperature, internal stresses, polymer and paint
coatings, linear expansion.
Introduction
There are two main sources of internal stresses in polymer
and paint coatings: 1. A decrease in the volume of the film formed on the surface
of the substratesubstrate due to the evaporation of solvents and, as a result of
chemical reactions, as well as due to the formation of supramolecular structures.
2. Thermal contraction with an increase in the temperature of film formation on
the surface of a solid substrate-substrate due to the difference in the coefficients
of linear expansion of the film and substrate. With an increase in internal
stresses in polymer and paint coatings ceteris paribus, the durability of the
coating decreases. The most common cause of the destruction of polymer and
paint coatings for various purposes is the cracking of the cover film and its
delamination from the substrate.
The Main Part Cracks occur when the magnitude of internal stresses in polymer
and paint coatings exceed the cohesive strength of the film under certain
operating conditions. With an increase in the coating thickness, the force that
shifts the coating from the substrate increases due to the action of internal
stresses, which reduces the adhesion and strength.
Modern Automotive Coating Processes
Modern automotive coating methods consist of five main steps. They include the
following:
Pretreatment: removes and cleans excess metal and forms an appropriate
surface structure enabling bonding of a corrosion protection layer.
The next step is electrodeposition (ED) of the anti-corrosion or rust
prevention layer.
THEORETICAL ASPECTS IN THE FORMATION OF
PEDAGOGICAL SCIENCES
International scientific-online conference
135
A sealer like Poly Vinyl Chloride (PVC) is applied for anti-corrosion,
elimination of water leaks, and minimization of chipping and vibrational noise.
A primer is then applied to promote adhesion between the surface and the
basecoat; it also imparts a smoother surface for subsequent layers and has anti-
chipping properties.
Finally, the topcoats that include a basecoat and clearcoat are applied; they
provide surface properties that are sought after, including color, appearance,
gloss, smoothness, and weather resistance.
The areas of an automobile depicted in
show where these five steps of
coating and other additional coatings are used. As can be realized when
examining this figure, a significant number of specific coatings and materials are
needed in addition to the above-listed steps to manufacture a salable
automobile.
Conclusion
In order to analyse the occurrence of internal stresses and develop a
new method and installations, below are the results of studying and analysing
the occurrence of internal stresses and existing methods, instruments and
installations for determining internal stresses in polymer and paint coatings.
References:
1. Andrievsky, RL. Nanostructural materials / R. A. Andrievsky, A. V. Ragulya. -
Moscow: Academy, 2005. - 192 p.
2. Arzamasov , B. N. Materials science: a textbook for technical universities / B.
N. Arzamasov [and others]. - Moscow: MSTU named after N. E. Bauman, 2001. -
648 p.
THEORETICAL ASPECTS IN THE FORMATION OF
PEDAGOGICAL SCIENCES
International scientific-online conference
136
3. Khodjaev, S. M., & Rakhmonova, S. S. (2022). Saving resources in the
operation, maintenance of automotive equipment. American Journal of
Interdisciplinary Research and Development, 5, 18-27.
4. Xodjayev, S., Xusanjonov, A., & Botirov, B. (2021). Gibrid dvigatelli
avtomobillardan foydalanib ichki yonuv dvigatellari ishlab chiqargan quvvat
samaradorligini oshirish va atrof-muhitga chiqarilayotgan zararli gazlarni
kamaytirish. Scientific progress, 2(1), 1523-1530.
