Modeling of indicators of competitive materials for the manufacture of formwork in the construction of industrial buildings

The article presents the results of an experimental substantiation of the production of plywood for construction purposes under conditions of low-temperature pressing and reduced binder consumption. Cost reduction while maintaining performance refers to the competitive advantages of the material. One of the ways to solve this problem is to significantly reduce the temperature of hot pressing plywood (below 100оC) and reduce resin consumption (less than 100 g/m2). The study implemented a second-order B-plan and developed regression models of the dependencies of the mechanical parameters of plywood on the pressing temperature, resin consumption and the proportion of additive modifiers – aluminum chloride and magnesium chloride. The decrease in the strength when splitting plywood on an unmodified phenol-formaldehyde binder is due to the low degree of polycondensation of the binder during low-temperature pressing. Rational values of the factors of the plywood production process were obtained by analyzing regression mathematical models of the dependence of plywood indicators on variable factors. For plywood based on a modified binder, the results were obtained – the strength of the samples when rolling over the adhesive layer after boiling was 0.808 MPa at the following modes: pressing temperature 95оC, resin consumption 93 g/m2 and modifier consumption 0.5% by weight of the resin for samples with the addition of magnesium chloride. The results obtained can be recommended for use in the production of plywood for formwork with the required mechanical properties.