1、MIL -A -81236 (W) 29 March 1965 SUPERSEDING WS 1708 6 November 1962 MILITARY SPECIFICATION ADHESIVE; EPOXY RESIN WITH POLYAMIDE CTJFUNG AGENT This specification has been approved by the Bureau of Naval Weapons, Department of the Navy 1. SCOPE 1.1 Scope. This specification covers one type of adhesive
2、 consisting of an epoxy resin and a polyamide curing agent. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invi- tation for bids or request for proposal, form a part of this specification to the extent specified herein. “ SPECIFICATIONS Federal QQ-A-362 Alumin
3、um Alloy, Plate and Sheet, Alclad 2 02 4 Military MIL-P-116 STANDARDS Federal Preservation, Methods of Federal Test Method Adhesives; Methods of Testing Standard No. 175 Military mL-STD-129 Marking for Shipment and Storage b Provided by IHSNot for ResaleNo reproduction or networking permitted withou
4、t license from IHS-,-,-(When requesting any of the above documents, give the title and complete designation of the item shown above. Copies of this specification and other unclassified specifications, standards and publications required by con- tractors in connection with specific procurement functi
5、ons may be obtained from the Commanding Officer, Naval Supply Depot (CDS), 5801 Tabor Avenue, Philadelphia, Pennsylvania, 19120.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date
6、of invitation for bids or request for proposal, shall apply. PUBLICATIONS American Society for Testing and Materials ASTMD 1084-60 Method of Test for Consistency of Adhesives Content of Epoxy Resins Gravity of Industrial Aromatic Hydrocarbons and Related Materials (Application for copies should be a
7、ddressed to the American Society for Tesing and Materials, 1916 Race Street, Philadelphia, Pennsylvania, 19103.) ASTM D 1652-62T Method of Test for Epoxy ASTM D 891-59 Method of Test for Specific 3. REQUIREMENTS 3.1 Data requirements. No data is required by this specification or be applicable docume
8、nts referenced in Section 2 unless specified in the contract or order (see 6.2). 3.2 Material. The material shall be a two-part thermosetting adhesive containing a base material of the epoxy resin type and a polyamide curing agent. 3.3 Physical and chemical properties. The physical and chemical prop
9、erties shall be as specified in Table I. 2 -, “. L -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-81236 80 W 7777706 OLL0072 5 Table I - Physical and Chemical Properties Property 1. Minimum( Maximum - - Epoxy Resin Viscosity at 25 degrees C
10、entigrade (C), Density at 25 degrees C gm/ml Epoxide equivalent, gm/eq poises Polyamide curing agent Viscosity at 75 degrees C, poises Density at 25 degrees C, gm/ml Amine value 110 1.15 187 2 0.94 350 160 1.21 19 1 6 1.00 400 3.3.1 Adhesive properties. The mixed adhesive shall have the following pr
11、operties: 3.3.1.1 Curability. When the epoxy resin and curing agent are mixed, the blend shall cure to a Shore tDft hardness of 75 f 10 in not more than 16 hours at 110 f 5 degrees Fahrenheit (F). 3.3.1.2 Tensile shear strength. The cured system shall have a minimum tensile shear strength of 1500 po
12、unds per square inch (psi) at 75 f 5 degrees F when cured for not more than 16 hours at 110 f 5 degrees F. 3.4 Workmanship. The material shall be uniform in quality and shall be free from impurities and other defects that could adversely affect its use. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibi
13、lity for inspection Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to
14、the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Classification of inspections. Inspection of the adhesive shall be cl
15、assified as follows: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. “ _ MIL-A-8L236 80 7777706 OLL0073 7 a. Preproduction inspection (see 4.4) b. Quality conformance inspection (see 4.5) 4.3 Sampling 4.3.1 Preproduction sample. A preproduction sam
16、ple of sufficient quantity of adhesive components manufactured in accordance with 3.1 shall be subjected to three each of the preproduction tests detailed in 4.4 at an activity designated by the procuring activity. Further production of the adhesive by the supplier prior to the approval of the prepr
17、oduction sample, shall be at the suppliers risk. 4.3.2 Quality conformance inspection sampling. Unless otherwise specified, sufficient material shall be taken from each lot to perform the tests as specified in 4.5. 4.3.3 Inspection lot. A lot of resin or curing agent shall consist of all material pr
18、esented for acceptance at one time and produced in a single manufacturing batch under homogeneous conditions of manufacture. 4.4 Preproduction inspection. The preproduction sample shall satis- factorily pass the quality conformance inspections as specified in 4.5. 4.5 Quality conformance inspection
19、4.5.1 Visual examination. Visually examine all containers in the lot to determine compliance with 3.4 and Section 5. 4.5.2 Viseoaity test. The viscosity of the epoxy resin base and polyamide curing agent shall be determined in accordance with ASTM D 1084-60. 4.5.3 Density test. The density of the ep
20、oxy resin base and polyamide curing agent shall be determined in accordance with ASTM D 891-59. 4.5.4 Epoxide equivalent test. The epoxide equivalent of the epoxy resin shall be determined in accordance with ASTM D 1652-62T. L P- Provided by IHSNot for ResaleNo reproduction or networking permitted w
21、ithout license from IHS-,-,- - MIL-A-B1236 80 W 777770b Oll0074 7 W MIL-A-81236 (W) 4.5.5 Amine value test. The amine value of the polyamide curing agent shall be determined by titration of a solution of the sample with 0.5 normal (N) hydrochloric acid. Apparatus. The following apparatus shall be us
22、ed: a. Analytical balance, minimum sensitivity 0.1 milligram (mg) b. Buret, 50-milliliter (ml) c. Flask, Erlenmeyer, pyrex, 125 ml d. Stirrer, magnetic, with chemically inert stirring bar Reagents. The following reagents shall be used: a. Bromcresol green solution, 100 mg of indicator (sodium salt)
23、in 100 ml water b. Hydrochloric acid solution, 0.5N (standardized to three decimal c. Solvent (equal parts by volume of toluene and n-butanol) d. Ethanol, 95 percent places) Procedure. The following procedure shall be used to determine amine value: a. .Dissolve 800 mg of the sample in 20 ml of solve
24、nt. The sample may be warmed to speed solution but must not be boiled. Add 30 ml of ethanol to clarify the solution. If the solution should become cloudy before the end point of titration, an additional 10 ml of ethanol may be added. b. Add 3 ml of indicator solution to the sample solution and titra
25、te with hydrochloric acid to an initial end point. Allow the titrated solution to stand several minutes until the green color returns. Then add additional indicator and titrate again, drop by drop, to a permanent yellow end point. c. Calculate the amine value as follows: Provided by IHSNot for Resal
26、eNo reproduction or networking permitted without license from IHS-,-,-MIL-A- 81.236 (W) Amine value = where: V X N X 56.1 W V = Volume of hydrochloric acid, ml -N = Normality of hydrochloric acid W = Sample weight, grams 4.5.6 Preparation of sample. The mixed adhesive, consisting of three parts by w
27、eight of epoxy resin and two parts by weight of polyamide curing agent, shall be tested as follows: 4.5.6.1 Curability test. The curability of the mixed adhesive shall be determined in accordance with the following: Curability. The epoxy resin and curing agent shall be mixed in the specified proport
28、ions and the mixture cast as a 1/4- to l/2-inch thicjk slab. The mixture shall be degassed and cured for not more than 16 hours at 110 f 5 degrees F. After cooling, the Shore ?Dff hardness shall be determined. 4.5.6.2 Tensile shear strength test. The tensile shear strength test shall be determined i
29、n accordance with Federal Standard Number 175, method 1033, except that: a. The finished specimens shall be conditioned at 75 f 5 degrees F and 50 i 10 percent relative humidity for a minimum of 16 hours. b. The specimen shall be dry tested at 75 f 5 degrees F and 50 f 10 percent relative humidity.
30、conforming to QQ-A-362. c. Wet test shall not be required. The adherends shall be aluminum d. Jaw separation shall be 0.1 inch per minute. 4.6 Acceptance criteria 4.6.1 Preproduction. Failure of any sample to comply with any require- ment of this specification shall be cause for rejection of the sam
31、ple. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-8L23b 80 m 7777906 OLL0076 2 m MIL-AS1236 (W) 4.6.2 Quality conformance. Failure of any sample to meet any require- ment of this specification shall be cause for rejection of the lot. 5. PREP
32、ARATION FOR DELIVERY 5.1 Preservation, packaging and packing. Unless otherwise specified by the procuring activity, the preservation, packaging and packing shall be in accordance with MIL-P-116, method III. 5.2 Marking. Each container shall be marked in accordance with MIL-STD-129. Marking shall inc
33、lude, but not be limited to, the following information: a. Manufacturers name and location b. Material trade name c. Net weight or volume d. Lot number, batch number and date of manufacture e. Shelf life or storage limitations f. Number and revision letter of this specification 6. NOTES 6.1 Intended
34、 use. The material purchased in accordance with this specification is intended to be used as an adheisve in rocket motors. 6.2 Ordering data. Procurement documents should specify, but not be limited to, the following information: a. Title, number and revision letter of this specification b. Minimum
35、lot size, if applicable c. Place of delivery d. Size of container e. Request for test data f. Whether preproduction sample is required 6.3 Definitions - amine value. Amine value is the milligrams of potassium hydroxide equivalent to the amine alkalinity in one.gram of sample. r 7 .c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
