Ensuring frost resistance of water-dispersion compositions for use in construction

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Дәйексөз келтіру

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Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

The article collects information on current Russian and international standards for monitoring the condition of water-dispersion products during tests of their frost resistance. It provides information on polymer dispersions developed and manufactured by Khoma Company LLC in frost-resistant versions, intended for the production of construction compositions. The processes that occur during the freezing of such heterophase systems are explained. The article considers methods for imparting frost resistance to water-based construction finishing compositions (primers, paints, adhesives, etc.): the introduction of compounds that lower the freezing temperature of water, targeted selection of initial components in the synthesis of film formers, the use of technological methods for the formation of polymer particles of a certain size and structure, a decrease in the concentration of the main substance with simultaneous additional stabilization. The properties of model compositions based on styrene-acrylic dispersions that passed freeze-thaw tests in different modes are presented. The particle size of polymer dispersions, viscosity of the compositions, strength and water absorption indices of films formed before and after the tests are monitored. It is shown that the introduction of the developed stabilizing additive allows to effectively increase the aggregation stability under the action of negative temperatures. It is concluded that water-dispersion systems, even if the manufacturer ensures their resistance to freezing, require special attention to cooling in different modes.

Толық мәтін

Рұқсат жабық

Авторлар туралы

S. Anisimova

OOO “Kompaniya Khoma”

Хат алмасуға жауапты Автор.
Email: anisimova-s@homa.ru

Сandidate of Sciences (Сhemistry)

Ресей, office 31, floor 1, 9T, Igumnovskoye Highway, Nizhny Novgorod Region, Dzerzhinsk, 606000

E. Spiridonova

OOO “Kompaniya Khoma”

Email: Spiridonova-e@homa.ru

Research Engineer

Ресей, office 31, floor 1, 9T, Igumnovskoye Highway, Nizhny Novgorod Region, Dzerzhinsk, 606000

A. Kulikova

OOO “Kompaniya Khoma”

Email: kulikova-a@homa.ru

Research Engineer

Ресей, office 31, floor 1, 9T, Igumnovskoye Highway, Nizhny Novgorod Region, Dzerzhinsk, 606000

Әдебиет тізімі

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Жүктеу
2. Fig. 1. Values of conditional viscosity and particle diameter of Homacryl-101M (a, b) and Novopol-004A (c, d) dispersions after each freezing cycle at minus 20оC (a, c) and at minus 40оC (b, d)

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3. Fig. 2. Properties of free films (а – tensile strength; b – water absorption; c – relative elongation at break; d – alkali resistance) formed from Novopol-004A, Homacryl-101M, Novopol-111 and Novopol-112AF dispersions before testing ■ and after 5 cycles of “freezing at minus 20оC – thawing” ■

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4. Fig. 3. Changes in particle size of model primer compositions obtained with a dispersion ratio (а – Novopol-111; b – Novopol-112AF) : water of 40–60% without additives (zero composition) and in the presence of 0.5% wetting agent Homawett 102 (composition 1), and with the introduction of 1.0% ethylene glycol (composition 2); before testing ■ and after 5 cycles of “freezing at minus 20оC – thawing” ■

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5. Fig. 4. Changes in particle size of model primer compositions obtained with a dispersion ratio (а – Novopol-111; b – Novopol-112AF) : water: 25–75%; before testing ■ and after freezing for 10 days at a temperature of minus 20оC ■

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6. Fig. 5. Changes in particle size of model primer compositions obtained with a dispersion ratio (а – Novopol-111; b – Novopol-112AF) : water: 25–75%; before testing ■ and after freezing for 10 days at a temperature of minus 40оC ■

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7. Fig. 6. Change in viscosity of water-dispersion paint samples after each freezing cycle at minus 20оC

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