APPLICATION DEVICE FOR A SOLID-FILLED PU FOAM

Abstract

The invention relates to an application device for a two-component spray foam for fire protection purposes comprising a first pressurized can with a component A containing a polyisocyanate and a first propellant gas component, a second pressurized can with a component B, containing at least one flameproofing agent in fine-particle form suspended in a polyol component, and a second propellant gas component, a retaining fixture for the first and second pressurized can, with said fixture being provided with a valve receptacle for each of the pressurize cans, a discharging aid for the spray foam, said discharging aid being connected via hose lines to the valve receptacles for the pressurized cans, and a forced mixer that mixes component A with component B when the discharging aid is activated.

Claims

1. Application device for a solid-filled two-component spray foam for fire protection purposes comprising a first pressurized can with a component A containing a polyisocyanate and a first propellant gas component, a second pressurized can with a component B, containing at least one flameproofing agent in fine-particle form suspended in a polyol component, and a second propellant gas component, a retaining fixture for the first and second pressurized can, with said fixture being provided with a valve receptacle for each of the pressurize cans, an activatable discharging aid for the spray foam, said discharging aid being connected via hose lines to the valve receptacles for the pressurized cans, and a forced mixer that mixes component A with component B when the discharging aid is activated.

2. Device according to claim 1, characterized in that component A contains a polyisocyanate or prepolymer on the basis of MDI.

3. Device according to claim 1, characterized in that component A contains a mixture of MDI isomers and MDI homologs with higher functionality.

4. Device according to claim 1, characterized in that component B contains a polyol based on glycols or glycerol or sugar-based alcohols.

5. Device according to claim 1, characterized in that component B contains a polyol mixture consisting of polyether polyols and/or polyester polyols having a mean molecular weight ranging between 350 and 7000, preferably between 800 and 4000.

6. Device according to claim 1. characterized in that component B contains water in an amount of up to 10 percent by weight, preferably of up to 4% by weight.

7. Device according to claim 1, characterized in that component B contains expandable graphite, polyphosphate, zinc borate, aluminum hydroxide, glass powder, slate, quartz sand, silicates and/or melamine in fine-particle form as flameproofing agent.

8. Device according to claim 1, characterized in that component B contains flameproofing agents in an amount of between 10 and 70 percent by weight, preferably between 40 and 60 percent by weight based on component B.

9. Device according to claim 1, characterized in that component B contains a catalyst.

10. Device according to claim 1, characterized in that the propellant gas component of components A and B contains propane, butane and/or dimethyl ether.

11. Device according to claim 10, characterized in that the propellant gas component of component A and/or B for the most part consists of dimethyl ether, with the first propellant mixture still containing isobutane and the second propellant mixture propane.

12. Device according to claim 1, characterized in that the retaining fixture is provided with a clamping aid for pressurized cans.

13. Device according to claim 12, characterized in that the clamping aid is designed as screw spindle by means of which pressure can valves are impressed into receptacles for activation.

14. Device according to claim 1, characterized in that the discharging aid is designed as spraying element or as application tube.

15. Device according to claim 14, characterized in that the discharging aid is provided with a trigger.

16. Device according to claim 1, characterized in that the discharging aid has bores of different widths for the components A and B as required by and suited for the respective viscosities.

17. Device according to claim 16, characterized in that the size of the bores for component A ranges between 0.3 and 2.0 mm and for component B between 1.5 and 4 mm.

Description

EXAMPLE

[0041] A component A was prepared for the first pressurized can, said component consisted of 350 g Desmodur 44 V 20 L (MDI mixture) and 25 g dimethyl ether isobutane mixture as first propellant gas.

[0042] For component B a mixture was prepared of 290 g polyether polyol 1, 150 g polyether polyol 2, 120 g expandable graphite, 180 g tricresyl phosphate, 8 g water, 5 g silicone stabilizer (Niax L 6900), and 5 g catalyst. 373 g of this mixture were blended in the second pressurized can with 25 g of a propane/butane/dimethyl ether mixture.

[0043] After mounting in the retaining fixture and tightening the spindle the first and second pressure cans are activated and ready for the discharge of the foam. Upon actuation of the trigger of the discharging aid a grayish foam is produced which hardens and sets after a few minutes and satisfies the legal regulations prescribed for fire protection.

[0044] It shall be understood that the polyisocyanate present in the first pressurized can and the hydroxyl group containing constituents in the second pressurized can are appropriately adjusted to one another such that an essentially complete conversion can be brought about. A slight excess of polyisocyanate is to be considered unobjectionable, especially due to the fact that this excess amount can be eliminated by reaction with air humidity. A minor excess amount of polyol is likewise unproblematic because this polyol may remain in the foam.