MATHEMATICAL MODELING OF THE CURING PROCESS OF NEWLY CREATED MATERIALS BASED ON POLYESTER RESIN

Аннотация

In this article, using mathematical modeling of the curing rate, the influence of factors directly affecting the curing processes of created materials prepared on the basis of unsaturated polyester resin is studied: the concentration of the accelerator, hardener and temperature. When modeling the process, the concentrations of the accelerator, hardener and temperature were taken as the initial (input) parameters, and the curing rate of the autofill at different temperatures was taken as the final (output) parameter. 1 INTRODUCTION This article is devoted to the study of the curing process of auto putty prepared on the basis of unsaturated polyester resin [3-6]. Paints and varnishes are multicomponent As you know, putties are used to level the surface compositions that, in a liquid state, are applied to the to be painted and are a thick, viscous, pasty mass surface of products and, after drying, form a film. this consisting of a mixture of fillers and pigments in a film is held by adhesion forces to the base and is film former. Putties have a rather higher viscosity called paint coatings. than other paints and varnishes due to the higher Paint and varnish coatings are widely used to content of solid components [7]. cover vehicles, performing two functions - protective Currently, the main volume of produced auto and decorative, i.e. technical and aesthetic. Paint and putty falls on the share of a polymer composition varnish coatings have significant advantages over produced on the basis of unsaturated polyester resin other types of coatings, since they are easier to apply [8, 9]. One of the important parameters of auto putty to the surface, which reduces the cost of painting is the curing speed after applying it to the surface. work. Paint and varnish coatings have great As noted above, unsaturated polyester resin is the durability; they can be applied to metal, plastics and binding component of car putty of various brands other materials [1]. from many manufacturers. Paints and varnishes are classified according to Automotive putties, as one of the representatives various criteria, for example, varnishes, enamels, of paints and varnishes, are multicomponent primers, putties, and each class has certain composite materials. To harden such a composition, requirements [2]. an accelerator is used, which is added to the The main paint and varnish materials used in composition of the auto putty, and a hardener, which vehicles include primers (primers), putties and is used before its use. Typically, the instructions enamels. supplied with the putty indicate the required amount of hardener for the working composition at a certain temperature. The amount of hardener for the curing methyl ethyl ketone peroxide: 1 - 1.5%, 1.8%; 2- 0.8%, reaction of the auto putty and accelerator, which is 1.6%; 3- 0.4%, 1.2%. introduced into the composition in advance, is also Based on the obtained experimental data, a important. mathematical model was built for the problem under When creating an auto putty, the optimal working consideration of determining the optimal amount of concentration of the accelerator in the composition of accelerator and hardener to optimize the curing time the composite material and hardener is selected of the auto filler at different temperatures. experimentally. Moreover, the paint and varnish Let's construct a linear regression equation for the industry produces car putties of various dependence of time (t) on temperature (T), compositions, depending on the region where they concentration of accelerator (x) and hardener (y) will be used. using the least squares method. In this regard, it becomes absolutely necessary to The relationship between time, temperature, use a method of mathematical modeling of the curing accelerator and hardener is determined using a matrix process of auto putty, since the rate of curing of auto of paired correlation coefficients using the MS Excel putty depends on the concentration of the accelerator, computer program system (2-table). hardener and the ambient temperature where it is used. 2-table. Results of dependencies between factors of the studied processes Factors 𝑡 𝑇 𝑥 𝑦 2 Main part 𝑡 1 The object of the study is a car putty created by the authors on the basis of an unsaturated polyester 𝑇 -0.81 1 resin (brand PN-1), where cobalt octoate is used as an accelerator, introduced into the composition, and 𝑥 -0.29 -0.31 1 methyl ethyl ketone peroxide, introduced before applying the car putty, is used as a hardener. 𝑦 -0.27 -0.32 0.94 1 Experimental data on the curing time of the auto putty were analyzed at various concentrations of accelerator, hardener and temperatures, analyzed Analysis of the results shows that there is a strong using the method of mathematical modeling using a inverse dependence of the curing time of the auto multivariate linear regression equation [10, 11]. putty on temperature and a weak inverse dependence In Fig. 1 shows the results of experimental on the