Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-12-15
1998-10-27
Niland, Patrick
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
411258, 428357, 42840221, 42840222, 4284022, 525126, 525127, 525129, 525440, 525445, 525451, 525455, 523201, 524590, B32B 1900, C08F 830, C08L 7500, C08L 2700
Patent
active
058279245
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to polymer sealant microencapsulated by polyurethane reaction and its binder solution, particularly employing threaded mechanical fasteners such as bolt-nuts, screws, pipe joints and threaded nails, etc.
In the assemblies of electronic products, automobiles and aircrafts, etc various kinds of bolt-nuts and screws are used as fastening means. But a fasten-locking system assembled by bolt-nuts or screws can be loosened by following reasons; The clearance between each of them is always present for their fastening and removing. Taking the screw surface of a bolt into a inclined plane in a little loosened bolt-nut system, the nut can gradually loose due to the sliding caused by its rotation or vibration, where the friction between them decreases with increasing of the clearance size.
Then, the more the fastening powers are increased, the more the sliding properties are decreased. But if there are some slidings between bolt-nuts, the loosenings caused by the properties can bring about when the fastening powers are applied to them. They also may be loosened by not only outside impact stress but also the shrinking/expanding of jointed polymer sealant or bolts and screws.
In order to prevent bolt-nuts or screws from loosening, some polymeric sealants are used, which play a role to restrain its rotation or vibration movement. Here, if the clearance between them is filled with the sealants, the sealants have adhesive function not to loosen its jointed parts.
In relation to this, U.S.S.R. SU Patent No. 1,399,316(1988), a preparation method for microcapsules containing acrylic monomers, reactive acrylate oligomers and initiators, was uniquely disclosed. It was difficult to find out other reports for microcapsules prepared by using these kinds of components besides the patent.
Referring to this microcapsulated adhesive, Japanese Patent Kokai No. 63-109,088(1988), a microencapsulation containing a unreactive polymer solution, had a difficulty to get its products owing to the high viscosity formatted by organic phase in the course of the microencapsulation, and U.S. Pat. No. 3,642,937(1972), Japanese Patent Kokai No. 60-173(1985) and Japanese Patent Kokai No. 04-290,539(1992), the microencapsulation by using other methods like a coacervation or its complicated one, also took a lot of time to get the products owing to its complicated process.
In order to prevent the various bolt-nuts and screws used in the assemblies of automobiles, electronic products and aircrafts, etc from loosening caused by outer impact, a liquid-typed anaerobic adhesive is generally used. The function of the adhesive is gained by fastening nuts after coating the adhesive on the bolts or screws, followed by its loss in the coarse of the coating of the adhesive. Thus, the adhesive is being gradually displaced by solid-typed one. The new adhesive on the surface of fastening parts is coated after blending of microcapsule-typed adhesive with its binder solution, followed by drying at 20.degree..about.40.degree. C. The adhesive is none of loss, and the workability is also good.
SUMMARY OF THE INVENTION
The object of this invention is to get polymer sealant from microcapsules gained by a polyurethane reaction and its binder solution.
This invention relates to polymer sealant microencapsulated by interfacial polyurethane reaction of triisocyanate with polyfunctional alcohol under aqueous oil droplet phase containing vinyl monomers, oligomers, redox initiators and organic solvents together as core materials in a mixture of gelatin and arabic gum as surfactant.
Its binder solution is also prepared by blending 0.5.about.8 weight percent of chloroprene, 15.about.25 weight percent of polyester acrylate, 10.about.25 weight percent of urethane acrylate and 10.about.25 weight percent of carboxyl- or hydroxyl-modified vinylchloride-vinylacetate copolymer in 15.0.about.64.5 weight percent of a mixture of tetrachloroethylene and toluene, followed by adding a small amount of initiators, coupling agents and fillers.
REFERENCES:
patent: 3642937 (1972-02-01), Deckert et al.
patent: 3746068 (1973-07-01), Deckert et al.
patent: 4657460 (1987-04-01), Bein
patent: 5000636 (1991-03-01), Wallace
Min Kyung-Suck
Park In-Hwan
Park Sang-chul
Korea Research Institute of Chemical Technology
Niland Patrick
LandOfFree
Polymer sealant microencapsulated by polyurethane reaction and i does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polymer sealant microencapsulated by polyurethane reaction and i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polymer sealant microencapsulated by polyurethane reaction and i will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1614458