USH1140H - Asbestos free adhesive insulation - Google Patents
Asbestos free adhesive insulation Download PDFInfo
- Publication number
- USH1140H USH1140H US07/660,316 US66031691A USH1140H US H1140 H USH1140 H US H1140H US 66031691 A US66031691 A US 66031691A US H1140 H USH1140 H US H1140H
- Authority
- US
- United States
- Prior art keywords
- adhesive
- asbestos
- bonding
- free adhesive
- rocket motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
- C06B45/12—Compositions or products which are defined by structure or arrangement of component of product having contiguous layers or zones
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/08—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using solid propellants
- F02K9/32—Constructional parts; Details not otherwise provided for
- F02K9/34—Casings; Combustion chambers; Liners thereof
- F02K9/346—Liners, e.g. inhibitors
Definitions
- This invention pertains to an insulating adhesive for bonding rocket motor components.
- Adhesives for bonding fuels and insulation into rocket motor casings in the prior art have often contained asbestos to make the adhesives more resistant to the hot gases in the rocket motor. These adhesives have three functions: first to insulate the fuel against heating due to air friction, second to insulate the casing from the heat of the burning fuel and third to bond the fuel to the case. It is undesirable to have voids between the fuel and the combustion chamber wall since such voids could permit combustion at undesirable times and places, impairing the efficiency of the rocket and endangering the integrity of the combustion chamber. The possible danger to the health of workers with asbestos makes it desirable to find other ways of accomplishing the same goals of good bonding combined with good insulation properties without the use of asbestos.
- an epoxy adhesive for bonding solid fuel to its case in a rocket motor uses chopped aramid fiber and microfine silicon dioxide filler to provide insulating properties to the adhesive without the use of asbestos.
- An important advantage of the present invention is the elimination of the use of asbestos in the workplace.
- the invention is an asbestos free adhesive, which by using Kevlar pulp as a filler, has excellent thermal, erosive, and physical properties for use in solid propellant rocket motors.
- the adhesive has ratio of ingredients by weight:
- This adhesive has the potential for several uses in solid propellant rocket motors.
- the physical properties make it an excellent choice for bonding elastomer insulations together where high bond strengths are required.
- Specific examples of this type of usage are bonding splice strips and patches onto internal insulation, and bonding the propellant stress relief flap into the motor. Its erosion and thermal properties permit its use as a potting compound for making repairs to the insulation and protecting sensitive components from the motor environment.
- the adhesive is prepared by slowly mixing the Bisphenol A/Epichlorohydrin type liquid epoxy resin (LER Type II such as Epon 828) and poly liquid resin curing agent (such as Versamid 140) for approximately 3 minutes. Concurrently, the microfine silicon dioxide (such as Cab-O-Sil) and chopped aramid pulp (such as Kevlar) is whipped together until the aramid fiber bundles are separated.
- LER Type II such as Epon 828
- poly liquid resin curing agent such as Versamid 140
- the dry and the wet mixtures are combined and mixed until fully wetted. After wetting the adhesive shall continue to be mixed for 3-5 minutes.
- the adhesive can be cured at ambient temperature (60°-100° F.) in 24 hours or the cure may be accelerated by curing at a higher temperature.
- the pot life of the adhesive is approximately 2 hours.
Abstract
An epoxy adhesive for bonding solid fuel to its case in a rocket motor uses chopped aramid fiber and microfine silicon dioxide filler to provide insulating properties to the adhesive without the use of asbestos.
Description
This invention pertains to an insulating adhesive for bonding rocket motor components.
Adhesives for bonding fuels and insulation into rocket motor casings in the prior art have often contained asbestos to make the adhesives more resistant to the hot gases in the rocket motor. These adhesives have three functions: first to insulate the fuel against heating due to air friction, second to insulate the casing from the heat of the burning fuel and third to bond the fuel to the case. It is undesirable to have voids between the fuel and the combustion chamber wall since such voids could permit combustion at undesirable times and places, impairing the efficiency of the rocket and endangering the integrity of the combustion chamber. The possible danger to the health of workers with asbestos makes it desirable to find other ways of accomplishing the same goals of good bonding combined with good insulation properties without the use of asbestos.
It is therefore the primary objectives of the present invention to create an insulating adhesive suitable for use in a rocket motor which does not require use of asbestos while retaining good bonding and insulating properties.
These objects of the invention and other objects, features and advantages to become apparent as the specification progresses are accomplished by the invention according to which, briefly stated, an epoxy adhesive for bonding solid fuel to its case in a rocket motor uses chopped aramid fiber and microfine silicon dioxide filler to provide insulating properties to the adhesive without the use of asbestos.
An important advantage of the present invention is the elimination of the use of asbestos in the workplace.
Other advantages are that the adhesive bonding remains as strong as prior art adhesives using asbestos and the thermal insulating properties remain good as good.
These and further objectives, constructional and operational characteristics, and advantages of the invention will no doubt be more evident to those skilled in the art from the detailed description given hereinafter which illustrates a preferred embodiment by way of non-limiting example.
The invention is an asbestos free adhesive, which by using Kevlar pulp as a filler, has excellent thermal, erosive, and physical properties for use in solid propellant rocket motors. The adhesive has ratio of ingredients by weight:
______________________________________
Bisphenol A/Epichlorohydrin type liquid epoxy resin:
27.8
poly liquid resin curing agent:
51.6
chopped aramid fiber pulp: up to 2.0
microfine silicon dioxide: up to 1.0
______________________________________
This adhesive has the potential for several uses in solid propellant rocket motors. The physical properties make it an excellent choice for bonding elastomer insulations together where high bond strengths are required. Specific examples of this type of usage are bonding splice strips and patches onto internal insulation, and bonding the propellant stress relief flap into the motor. Its erosion and thermal properties permit its use as a potting compound for making repairs to the insulation and protecting sensitive components from the motor environment.
The adhesive is prepared by slowly mixing the Bisphenol A/Epichlorohydrin type liquid epoxy resin (LER Type II such as Epon 828) and poly liquid resin curing agent (such as Versamid 140) for approximately 3 minutes. Concurrently, the microfine silicon dioxide (such as Cab-O-Sil) and chopped aramid pulp (such as Kevlar) is whipped together until the aramid fiber bundles are separated.
The dry and the wet mixtures are combined and mixed until fully wetted. After wetting the adhesive shall continue to be mixed for 3-5 minutes.
The adhesive can be cured at ambient temperature (60°-100° F.) in 24 hours or the cure may be accelerated by curing at a higher temperature. The pot life of the adhesive is approximately 2 hours.
This invention is not limited to the preferred embodiment heretofore described, to which variations and improvements may be made, without departing from the scope of protection of the present patent and true spirit of the invention, the characteristics of which are summarized in the following claim.
Claims (1)
1. An adhesive for bonding a solid fuel propellant to a case in a rocket motor essentially consisting of, by weight:
______________________________________
Bisphenol A/Epichlorohydrin type liquid epoxy resin:
27.8
poly liquid resin curing agent:
51.6
chopped aramid fiber pulp: up to 2.0
microfine silicon dioxide: up to 1.0.
______________________________________
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/660,316 USH1140H (en) | 1991-02-22 | 1991-02-22 | Asbestos free adhesive insulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/660,316 USH1140H (en) | 1991-02-22 | 1991-02-22 | Asbestos free adhesive insulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| USH1140H true USH1140H (en) | 1993-02-02 |
Family
ID=24649024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US07/660,316 Abandoned USH1140H (en) | 1991-02-22 | 1991-02-22 | Asbestos free adhesive insulation |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | USH1140H (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6265330B1 (en) | 1998-04-14 | 2001-07-24 | Atlantic Research Corporation | Non-Asbestos insulation for rocket motor casing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2986539A (en) | 1957-03-07 | 1961-05-30 | American Can Co | Polyamide-epoxy adhesive |
| US3075932A (en) | 1958-04-15 | 1963-01-29 | Shell Oil Co | Process for curing polyepoxides with polyamino polyamide compounds and resulting products |
| US3085075A (en) | 1958-05-14 | 1963-04-09 | Lancaster Chemical Corp | Cured epoxy resins |
| US3183198A (en) | 1960-08-09 | 1965-05-11 | Tile Council Of America | Two-part adhesive bonding compositions comprising an epoxy resinous material and a poly-amido amine |
| US3396138A (en) | 1964-08-21 | 1968-08-06 | Tile Council Of America | Organic acid resistant compositions from epoxy resin, polyamines and clay |
| US4162931A (en) | 1974-11-29 | 1979-07-31 | Texaco Development Corp. | Method employing polyamide thermoplastic adhesives |
-
1991
- 1991-02-22 US US07/660,316 patent/USH1140H/en not_active Abandoned
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2986539A (en) | 1957-03-07 | 1961-05-30 | American Can Co | Polyamide-epoxy adhesive |
| US3075932A (en) | 1958-04-15 | 1963-01-29 | Shell Oil Co | Process for curing polyepoxides with polyamino polyamide compounds and resulting products |
| US3085075A (en) | 1958-05-14 | 1963-04-09 | Lancaster Chemical Corp | Cured epoxy resins |
| US3183198A (en) | 1960-08-09 | 1965-05-11 | Tile Council Of America | Two-part adhesive bonding compositions comprising an epoxy resinous material and a poly-amido amine |
| US3396138A (en) | 1964-08-21 | 1968-08-06 | Tile Council Of America | Organic acid resistant compositions from epoxy resin, polyamines and clay |
| US4162931A (en) | 1974-11-29 | 1979-07-31 | Texaco Development Corp. | Method employing polyamide thermoplastic adhesives |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6265330B1 (en) | 1998-04-14 | 2001-07-24 | Atlantic Research Corporation | Non-Asbestos insulation for rocket motor casing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: THIOKOL CORPORATION Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:GREENWOOD, STEWART H.;CALDWELL, GORDON A.;REEL/FRAME:005765/0026;SIGNING DATES FROM 19910215 TO 19910305 |
|
| STCF | Information on status: patent grant |
Free format text: PATENTED CASE |