Glue solid content test method

Glue is an intermediate that connects two materials. It mostly appears as an aqueous agent. It belongs to the fine chemical industry and has many types. It is mainly classified according to the adhesive material, physical form, hardening method and material of the adherend. Common ones include instant glue (the common one is -1203 instant glue-ethyl cyanoacrylate strong instant adhesive), epoxy resin bonding type, anaerobic glue, UV glue (ultraviolet light curing type), hot melt Glue, pressure-sensitive glue, latex, etc.

The main ingredient in glue is polyvinyl alcohol, which is a water-soluble plastic. When we add borax, boron atoms and oxygen atoms will string together polyvinyl alcohol molecules, so the properties of the original glue can be changed. The ingredients of ordinary glue on the market are basically water, with some added polyvinyl alcohol, white latex, sodium stearate, talc, urea, ethylene glycol, sucrose, flavors, etc., which are not harmful to the human body. The main component of 502 glue is α-ethyl cyanoacrylate. Its essence is a colorless, transparent, low-viscosity, non-flammable liquid. It is a single component, solvent-free, has a slightly irritating smell, is volatile, and the volatile gas has weak tear-destroying properties. .

The solid content of glue is about 30%-40%. The control of solid content and moisture has an important impact on the quality of glue, so it is very necessary to detect the moisture and solid content of glue.

Experimental principle

The ring-shaped quartz tungsten halogen infrared ring lamp heating method can be heated directly from inside the glue, so that the moisture in the product is evaporated to detect the solid content of the product. At the same time, due to the continuous supply of heat energy and the continuous removal of water vapor, complete drying is achieved. The excellent and unique temperature-controlled heating system makes the heating uniform, forming a balanced cycle, and monitors the values ​​of water loss and solid content in real time to make the results more accurate. .

Instructions for using the tester;

* The sample needs to be shaken before testing;

* Place glass fiber paper on the sample tray and press the tare key;

* When testing, use a glue-tip dropper to suck out the glue and drop it evenly onto the sample plate with glass fiber paper;

* After the test is completed, when the temperature drops, the glass fiber paper must be torn off from the sample pan to prevent the glass fiber paper from adhering to the sample pan after cooling.

Test sample (automatic mode)

First time: Use a glue tip dropper to extract 4.3 grams of glue sample, place the glass fiber paper in a stainless steel tray and peel it, use a glue tip dropper to evenly drop the glue sample on the glass fiber paper, set the temperature to 150°C and heat it with an instrument , the test ended after about 6 minutes, and the test data showed 33.60%;

The second time: Use a glue tip dropper to extract 5.0 grams of glue sample, place the glass fiber paper in a stainless steel tray and peel it, use a glue tip dropper to evenly drop the glue sample on the glass fiber paper, and set the temperature to 150°C with an instrument. Heating, the test ended after about 7 minutes, and the test data showed 32.17%;

Test sample (timed mode)

First time: Use a glue tip dropper to extract 4.8 grams of glue sample, place the glass fiber paper in a stainless steel tray and peel it, use a glue tip dropper to evenly drop the glue sample on the glass fiber paper, set the temperature to 150°C and heat it with an instrument , the test ended after 10 minutes, and the test data showed 33.56%;

The second time: Use a glue tip dropper to extract 4.8 grams of glue sample, place the glass fiber paper in a stainless steel tray and peel it, use a glue tip dropper to evenly drop the glue sample on the glass fiber paper, set the temperature to 150°C and use an instrument. Heating, the test ended after 10 minutes, and the test data showed 33.08%;

Experiment records

Project model	Sample type	Temperature (℃)	Sample weight (g)	Detection time (min)	Test data solid content (%)	Remark
thousandth	SWC	150	4.3	6	33.60	automatic mode
thousandth	SWC	150	5.0	7	32.17	automatic mode
thousandth	SWC	150	4.8	10	33.56	Timing mode
thousandth	SWC	150	4.8	10	33.08	Timing mode

　　1. Please use it under the environmental conditions specified in the product instruction manual. Do not operate in an environment that does not meet the requirements.

　　*2. When placing the glue sample, try to drip it evenly on the glass fiber paper. Try to drip it evenly on the glass fiber paper. When extracting and sampling: a. Do not touch the sample pan and sample pan holder with force. b. Do not touch the sample pan holder to the windproof plate. Otherwise, the instrument screen values ​​will jump and the test data results will be biased.

　　3. There should be enough space around the instrument to avoid heat accumulation and overheating (there should be 1m of space above the instrument). Do not knock or shake the table during testing to avoid external influences on the instrument.

　　4. Since the area around the heating unit around the instrument will become hot, do not place flammable items around the instrument. Do not place your hands on top of the lid to avoid burns.

　　5. During the heating and drying process, the temperature of the annular heating element and its protective glass will reach 200°C. Therefore do not open or touch the heating unit. If you need to open it, disconnect the power supply and wait until it cools down completely.

　　6. After the test is completed, since the sample itself, the heating unit and other containers will still be very hot, care should be taken when removing the sample.

　　7. This instrument is not suitable for use with flammable or flammable items or corrosive substances. Forcible use may cause harm to the human body or damage the equipment.