Healant for wetted surface

A repairing agent, wet surface technology, applied in the field of epoxy modified two-component reactive wet surface adhesive, can solve the problems of difficult to achieve strength and temperature resistance, large foreign exchange consumption, unsatisfactory performance, etc., and reach the operating temperature range. Wide, fast repair speed, high bonding strength effect

Inactive Publication Date: 2013-03-27

北京天诚宇新材料技术有限公司

5 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

In addition, although some domestic units have developed some metal fillers and wet surface adhesives, their performance cannot meet the requirements for equipment maintenance.

Although the performance of the above-mentioned foreign-developed repair materials is higher than that of domestic products, Germany’s Diamant products were used for tank track hangers in my country in ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Abstract

The invention provides a healant for a wetted surface and a preparation method thereof. The healant refers to an epoxy-modified double-component reaction-type wetted surface (underwater) adhesive, the bonding strength of which after being solidified reaches 35MPa and the using temperature is -60 degrees centigrade to 180 degrees centigrade. The invention is mainly applied to the leaking stoppage and sealing for various pipelines, valves, heating radiators, ships, fuel tanks and water tanks as well as mending processes such as connecting and sealing of the underwater cable joints. The invention has the advantages of water resistance, acid and alkali resistance, salt resistance and oil resistance.

Technology Topic

Salt resistanceBonding strength +10

Image

Examples

Experimental program(1)
Effect test(1)

Example Embodiment

[0059] Example 1-3

[0060] The A component is epoxy resin E44 7500g, epoxy resin E51 1500g, aluminum oxide 143g, stainless steel powder 440g, cement 4000g, glass fiber 1000g and white carbon black 70g; B component is KH550 silane coupling agent 43g, DMP -30 (2,4,6-tris(dimethylaminomethyl)phenol) 650g, low-molecular polyamide 650 860g and white carbon black 800g; the above components A and B are proportioned by weight to 5:1~ Weigh at a ratio of 6:1 and mix well. The specific configuration of each embodiment is shown in Table 1.

[0061] Table 1

[0062] Example 1 2 3 Grade TG620 TG621 TG622 A, B ratio 5:1 5.3:1 6:1

[0063] Seven performance indicators of tensile strength, tensile shear strength, compressive strength, hardness, wet surface properties, corrosion resistance and temperature resistance have been tested according to the Ministry of Chemical Industry and national standards. The test methods and test results are as follows:

[0064] 3.1 Tensile strength

[0065] (1) Test method:

[0066] 1. Sample (sample shape and size such as figure 1 Shown)

[0067] Note: The glued surface of the sample should be flat and perpendicular to the main axis of the sample; sufficient adhesive should be used for the glued joints, and there should be a little excess glue around the joints to avoid under glued joints, and overflow glue usually does not need to be removed.

[0068] 2. Test equipment:

[0069] The tensile machine should make the sample damage load within 10% to 90% of the full scale of the tensile force. The measurement error of the tensile machine should not exceed 1%. The tensile machine should increase the load at a constant speed.

[0070] 3. Test conditions:

[0071] When there is no special requirement, it shall be carried out according to the test conditions recommended by GB2918, that is, the temperature is 23±2℃, and the relative humidity is (50±5)%.

[0072] 4. Test results:

[0073] (1) The tensile strength is calculated according to formula (1):

[0074]

[0075] -Tensile strength (MPa);

[0076] P is the highest load when the sample is broken (N);

[0077] A is the bonding area (mm2).

[0078] (2) Unless otherwise specified in the adhesive product standard, the tensile strength value is calculated as the arithmetic average of five valid test results.

[0079] (2) Test results

[0080] The tensile strength test results are shown in Table 2.

[0081] Table 2 Tensile strength test results

[0082]

[0083] 3.2 Tensile shear strength

[0084] testing method:

[0085] 1. Sample

[0086] The sample shape is as large as figure 2 Shown.

[0087] 2. Test equipment

[0088] (1) The testing machine used should be such that the damage load of the sample is between 15% and 85% of the full standard load. The force value indication error of the testing machine should not exceed 1%. The testing machine should ensure the sample holder The moving speed is stable within 5±1mm/1min;

[0089] (2) The surface of the metal sheet used for bonding should be flat, and there should be no deformation such as bending, twisting, and skewing. The metal sheet should be free of burrs and the edges should be at right angles;

[0090] (3) Clamps should be used to prepare samples to ensure that the samples are correctly overlapped and positioned accurately.

[0091] 3. Test conditions

[0092] Unless otherwise specified, the parking time of the sample and the test environment should meet the following requirements:

[0093] (1) The shortest time from sample preparation to test is 16h, and the longest time is 1 month:

[0094] (2) The test should be carried out in an environment with a temperature of 23±2℃. Arbitration tests or adhesives sensitive to temperature and humidity should be carried out in an environment with a temperature of 234±2°C and a relative humidity of 45% to 55%;

[0095] (3) For tests with only temperature requirements, the sample should be parked at the test temperature for no less than half an hour before the test; for tests with temperature and humidity requirements, the parking time of the sample in the test environment before the test is generally not Should be less than 16h.

[0096] 4. Test results

[0097] (1) The tensile shear strength is calculated according to formula (2):

[0098]

[0099] Where - Tensile shear strength (MPa);

[0100] P--Maximum load at failure (N);

[0101] B--The width of the sample bonding surface (mm);

[0102] L-the length of the bonding surface of the sample (mm).

[0103] (2) The test results are expressed as the arithmetic mean, maximum and minimum values of shear strength, with four significant figures.

[0104] (2) Test results

[0105] The results of the tensile shear strength test are shown in Table 3.

[0106] Table 3 Tensile shear strength test results

[0107]

[0108] 3.3 Compressive strength

[0109] (1) Test method

[0110] 1. Sample

[0111] (1) The shape and size of the glue are as shown in the figure

[0112] (2) The upper and lower end faces of the glue column should be flat and perpendicular to the main axis of the glue column.

[0113] 2. Test equipment

[0114] The testing machine should make the damage load of the sample within 10% to 90% of the full scale, and the measurement error of the testing machine should not exceed 1%.

[0115] 3. Test conditions

[0116] The moving speed of the indenter of the testing machine is ±0.2mm/min.

[0117] 4. Test results

[0118] (1) The compressive strength is calculated according to formula (3);

[0119] B=P/A

[0120] Where B is the compressive strength (MPa);

[0121] P-Maximum load at failure (N);

[0122] A-Cross-sectional area of glue column (mm 2 ).

[0123] (2) Test results

[0124] Table 4 Compressive strength test results

[0125]

[0126] 3.4 Hardness

[0127] (1) Test method:

[0128] 1. Sample

[0129] (1) The adhesive layer should be of uniform thickness, with a smooth, flat surface, no bubbles, mechanical damage and impurities, etc.;

[0130] (2) The thickness of the adhesive layer should not be less than 3 mm;

[0131] (3) The size of the sample should ensure that the distance between each measurement point and the edge of the sample is not less than 12 mm, and the distance between each measurement point is not less than 6 mm;

[0132] (4) The number of measurement points for each group of samples is not less than 5, which can be carried out on one or several samples.

[0133] 2. Test equipment

[0134] (1) The equipment used in this test is the xHS.D Shore hardness tester.

[0135] (2) The maximum allowable deviation of hardness is ±1 Shore hardness value.

[0136] 3. Test conditions

[0137] (1) When there is no special requirement, the sample should be placed in the test environment for at least 1 hour before the test.

[0138] (2) Read the reading immediately after the indenter is in full contact with the sample for 15 seconds. If an instantaneous reading is specified, it should be read within 1 second after the indenter is in full contact with the sample.

[0139] 4. Test results

[0140] (1) The reading obtained on the reading dial is the measured Shore hardness value.

[0141] (2) The number of measurement points for each group of samples is not less than 5, which can be carried out on one or several samples. The test results are expressed as the arithmetic average of a group of samples.

[0142] (2) Test results

[0143] The hardness test results are shown in Table 5.

[0144] Table 5. Hardness test results

[0145]

[0146] 3.5 Wetness

[0147] (1) Test method

[0148] 1. Sample

[0149] (1) Sample shape and size such as Figure 4 Shown

[0150] (2) The sample base is 45 steel, the coating and the base are firmly bonded, and the coating surface has no defects.

[0151] 2. Test equipment

[0152] (1) The equipment used in this test is SKODA-SAVIN friction and wear testing machine;

[0153] (2) The grinding wheel is 40 hard alloy, and the surface roughness is Ra0.03;

[0154] (3) Rotation speed of grinding wheel: n=675r/rain.

[0155] 3. Test conditions

[0156] (1) Before the test, the surface of the sample should be ground;

[0157] (2) Preload: p=5Kg;

[0158] (3) Total number of revolutions: N=3000r;

[0159] (4) Inject 50% K between the grinding wheel and the coating 2 CrO 7 Aqueous solution.

[0160] 4. Test results

[0161] (1) Measure the wear scar width B with eyepieces, check the table to get the corresponding wear volume, and calculate its wet surface;

[0162] (2) The test results are expressed as the arithmetic average of no less than three test blocks.

[0163] (2) Test results

[0164] The wear test results are shown in Table 6

[0165] Table 6. Wear test results

[0166]

[0167] 3.6 Corrosion resistance

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

Classification and recommendation of technical efficacy words

Fast patching
Easy to use

People also interested in

High bonding strength Wide temperature range Adhesive Engineering Fuel tank Water resistance Underwater Water tanks

Healant for wetted surface

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Fishing diamond-type screen tricot knitting net sheet repairing method

Fast hardening early strength concrete for overall width repair of cement concrete pavement

Roof water leakage detecting system

Concrete pipe anti-leak treatment technique and special device

Reconfigurable measurement system utilizing a programmable hardware element and fixed hardware resources

Classification and recommendation of technical efficacy words

Fishing diamond-type screen tricot knitting net sheet repairing method

Fast hardening early strength concrete for overall width repair of cement concrete pavement

Roof water leakage detecting system

Concrete pipe anti-leak treatment technique and special device

Delivery of respiratory therapy

Electrically programmable device with embedded eeprom and method for making thereof

Method for accessing structured data in IC cards

Laser assisted total joint arthroplasty

System, method, and apparatus for settlement for participation in an electric power grid

People also interested in