Product Description
Polyol (Component A) is a yellow to brown mixture of polyesters and special additives.
Isocyanate component (Component B) is polymeric diphenylmethane diisocyanate of the following grades: «Lupranat M 20 S», «Millionate — MR 200», «Wannate — PM 200», «Desmodur VKS 20 F», «Suprasec 5005», «Cosmonate M-200», «Ongronate 2100» — a transparent brown liquid which is not stratified.
Physical and mechanical parameters
Component A
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Parameter
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Value
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Dynamic viscosity at 25°C, mPa-s
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100–350
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Density at 25°C, g/cm3
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1.00–1.10
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Start time, sec
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2-3
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Lifting time, sec
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10-15
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Apparent density at free foaming, kg/m3
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25-28
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Final PU product
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Parameter
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Value
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Test method
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Product density, kg/m3
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33-36
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GOST 17177
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Compressive strength, N/mm2
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0.18 — 0
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GOST 17177
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Bending strength, N/mm2
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0.29-0.33
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GOST 17177
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Heat conductivity, W/(m*K)
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0.021-0.024
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GOST 7076
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Water absorption by volume after 7 days
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not more than 5 %
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GOST 20869
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Differences between freon and water systems
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Comparative characteristics
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Freon
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Water
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Price
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10-15% more expensive than water domestic systems and 40-50% more expensive than imported systems.
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domestic systems and 40-50% more expensive than imported systems. 10-15% cheaper than freon systems of domestic components and 40-50% cheaper than imported systems.
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Summer systems — spraying at temperatures from +10 ° C to +30 ° C. Processing conditions are limited in the area of high temperatures
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Recycling terms
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Winter systems — spraying at temperatures from −10 ° C to +15 ° C. Processing conditions are limited in the high temperature range. When processing winter freon systems at low temperatures from +10 ° C to −10 ° C it is obligatory to apply a primer (dewaxing) layer. The next layer of polyurethane foam after the priming layer is applied at least 5 hours later.
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Spraying at temperatures from +10 ° C to +40 ° C. No winter systems for PUF spraying at low temperatures.
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Storage
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Freon is more sensitive to temperature fluctuations and partially escapes during storage. If drums are stored outside, in hot weather, the drums may bloat.
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Temperature fluctuations are not critical in storage.
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Adhesion
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Adhesion to the substrate and between layers is better than that of water-based systems.
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Adhesion to the substrate and between layers is worse than that of freon systems.
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Heat conductivity
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10-15% lower than that of water systems, so the thickness of the PU can be made 10-15% less.
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10-15% higher than that of freon systems, so the thickness of insulation should be made 10-15% more.
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Density
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There are no freon systems for spraying FPU with a density below 25 kg/m3.
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There are components for spraying with a density of 8-20 kg/m3.
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Actual density for systems with a density of 30 kg/m3
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The actual density of the finished foam 33-36 kg/m3 or 13-14 cc with 1 set of 470 kg at a thickness of 5 cm for components with a density of 30 kg/m3 at an ambient temperature of 25-30 ° C and applied in two layers of 2.5 cm on the high-pressure machine.
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The actual density of the finished foam 40-43 kg/m3 or 10.9-11.75 cc with 1 set weight of 470 kg. at a thickness of 5 cm for components with a density of 30 kg/m3 at an ambient temperature of 25-30 ° C and applied in two layers of 2.5 cm on the high-pressure machine.
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Recommended ratio of volumetric parts of components A and B: 100 к 100.
Components preparation
- For reactivity and viscosity of the components before processing, heat component A to 28-30 ° C, component B to 40-50 ° C with heating belts.
- After heating component A stir with a paddle stirrer for 30 minutes at a speed of 500-1000 rpm.
- Do not stir component B if stored at ≥ +15 °C. If stored at temperatures below +15 ° C, slowly warm up to a temperature not exceeding +50 ° C. Then roll the barrel horizontally until homogeneous (homogeneous).
Surface requirements and environmental conditions
- Surface for the application of polyurethane foam must be clean, dry, dust-free and degreased, without crumbling and crumbling areas.
- The surface of bituminous materials (roofing felt, roofing paper, etc.) should be cleaned mechanically. The surface of asphalt, epoxy, polymethylmethacrylate coatings are processed with abrasive equipment (belt or disc grinders) and remove the resulting dust.
- Remove all traces of rust and degrease metal surfaces.
- The spraying surface must be free of condensation of moisture from the ambient air.
- The temperature of the spraying surface must be at least 3 °C above the measured dew point.
- Do not spray at wind speeds greater than 7 m/s.
- If the surface temperature is below 10 ° C, use Himtrust components for low temperatures.
- At ambient temperatures above 35 ° C or surface temperatures above 55 ° C spraying is not recommended.
Processing rules
For high-pressure machines:
- Ambient temperature — 10-20 °С. Flow heater temperature: component A — 30-33 ° C, component B — 45-55 ° C, hose temperature — 40-50 ° C. Apply a priming layer of polyurethane foam 2-3 mm, and leave for 5 hours until it becomes elastic. Then apply a layer of FPU in one pass not more than 25 mm.
- Ambient temperature — 20-30 °С. Flow heater temperature: component A — 30 ° C, component B — 40-45 ° C, hose temperature — 25-30 ° C. Apply a layer of polyurethane foam in one pass with a thickness of no more than 25 mm.
- Ambient temperature — 30-35 °С. Flow heater temperature: component A — 25-30 ° C, component B — 40-45 ° C, turn off the heating hoses. Apply a layer of polyurethane foam in one pass with a thickness of no more than 25 mm.
For low-pressure machines:
- Ambient temperature is 10-20 ° C. Barrel with component A heated to 28-30 ° C, component B — to 50-55 ° C. Hoses length not more than 10 m should be insulated. Apply a primer layer of polyurethane foam 2-3 mm, wait 5 hours until it becomes elastic. Then apply a layer of polyurethane foam in one pass with a thickness of not more than 25 mm.
- Ambient temperature: 20-35 °С. Temperature of component A — 25-30 ° C, component B — 45-50 ° C. Apply a layer of PU in one pass not more than 25 mm.
Trial spraying
Before applying polyurethane foam perform a test spraying on an area of 2 m2 to check the performance of the system. Check the start and rise time of the foam and check it against the specified in the specifications.
10 minutes after spraying, cut the sample and visually evaluate the structure. It should be fine-cellular, without visible defects: shells, air bubbles, etc. If the composition has not foamed, the foam is brittle or elastic, you should check the brand and expiration date of the components, the correct dosage, set the temperature and pressure, then perform a second test spraying.
Recommendations for spraying
Spraying is performed from a distance of 0.6-1.0 m. The operator should direct the sprayer perpendicular to the insulated surface. Spraying should be done evenly, without pauses and jerks in the movement of the sprayer. Polyurethane foam insulation is applied in 2-4 layers. The thickness of the foamed layer in one pass should be no more than 25 mm in order to avoid overheating of the foam and degradation of the PU. The next layer should be sprayed at a temperature no higher than 40 ° C, if necessary, measured with a pyrometer. Do not apply the next layer of FPU, if the previous one has not foamed. Stop spraying the PU in case of rain. Continue when the previous layer of polyurethane foam and the surface to be insulated is completely dry. Start spraying from hard-to-reach places (gables, chimneys, vents, etc.).
Cleaning of equipment and tools after use
Clean tools, equipment, contaminated surfaces with solvents (acetone, dimethylformamide, etc.). Cured PUF is removed mechanically with a metal brush, spatula.
System consumption per 1 m2
Consumption of the system on 1 m2 with a thickness of 5 cm — 2-2.25 kg, or yield from the set of 12-14 m3.
Health effects
- Finished PU products are harmless to the human body and the environment.
- Component A is a low-hazard product in terms of its effect on the body. In contact with the skin causes irritation. In contact with the eyes causes irreversible consequences.
- Component B in contact with skin and eyes causes irritation. Harmful if inhaled.
Security measures
When working with components, the room must be equipped with exhaust ventilation and fire extinguishing means.
Use personal protective equipment: special clothing and shoes, impermeable gloves made of synthetic rubber, safety glasses with side shields, respirator / gas mask BKF or B.
In case of contact of the FPU components with exposed skin it is necessary to remove them with a rag and wash with warm water and soap, in case of skin reactions it is necessary to consult a doctor.
In case of contact with the components of the PU in the eyes it is necessary to rinse them immediately with plenty of running water for 5-10 minutes, then consult a doctor.
Shipping and storage conditions
- Component systems are transported in the manufacturer’s packaging by rail and road in accordance with cargo transportation rules for these types of transport, ensuring tare integrity, reliable fixation in order to prevent leakage and damage.
- Component systems must be stored in covered warehouses in sealed original packaging under conditions that exclude moisture. Storage temperature for component A from −60 ° C to +30 ° C, for component B as recommended by the manufacturer.
