(1) material:

Methyl methacrylate, a raw material monomer without prepolymerization, is a colorless and transparent liquid, which acts as a solvent in specimen preparation.

Mature monomer-prepolymer methyl methacrylate, colorless and transparent viscous liquid. Keep the original performance below 5 degrees Celsius, and gradually heat and cure at high temperature.

Materials should be stored in big jars and kept in the refrigerator. When in use, take a small amount in a small bottle.

(2) Material preparation

It is best to have a fully dry three-dimensional dry specimen.

[3] Tools

Tweezers, dissecting needle, smooth and clean glass plate and glass slide, air pump, polishing machine.

[4] Process

1) molding

The glass plate is the bottom plate and the glass slide is the four walls, and the mold is made according to the size of the specimen. After setting, dip a small amount of cooked monomer with tweezers above the seam of the glass slide, and let it flow down by itself to bond the seam. The bonding process must be repeated twice. And then put into a 40 DEG C constant temperature box to cure the monomer. After the mold is completed, mature monomers with a thickness of 4-5 mm can be injected. Then put it into a 40℃ thermostat for 12 hours to polymerize and harden into a fixed layer. Soak the label written with drawing ink in the raw material monomer, add a thin layer of cooked monomer and cure.

2) Embedding

Soak the dried specimen in the raw material monomer for about 65438 0 hours to make it completely soaked. A certain amount of mature monomer is injected into the mold, and then the specimen is put into the mold, shaped and supported with tweezers and dissecting needles. When the monomer is slightly polymerized and the sample position is fixed, the whole mold moves smoothly to the covered glassware. In the embedding process, try to polymerize under natural conditions, which will take a long time, but it is not easy to produce bubbles. Two days later, probe with a dissecting needle, and add 5 mm thick cooked monomer before the monomer is polymerized into semi-solid and not completely solidified. When adding monomer, inject it from one end of the mold to make it naturally flow into the other end to make it smooth, and pay attention to shaping it with a scalpel at any time. This process is repeated until the embedding is completed. If heating is needed to accelerate polymerization, the monomer should be cured in a sealed container with an air pump after addition.

If the monomer is taken out of the refrigerator and poured into the mold, if there is water condensation on the surface, the operation should be stopped. After the water evaporates, drop a small amount of raw monomer on the monomer to melt the cooked monomer and continue.

If bubbles are generated, it is necessary to use an anatomical needle to break the bubbles, and drop a little raw material monomer on the needle to make it flow down the needle. Let the bubbles float, and then fill the pinhole with cooked monomer to continue.

3) demoulding

After the monomer is completely cured, it can be demoulded (it takes about half a month from the first injection to the final complete curing). Remove the bottom plate first, and then remove the four walls. You can push harder.

4) Renovation

If the surface is uneven after demoulding, scissors, steel file and grindstone can be used to repair it. And then polished with a cloth wheel polishing machine.

Most of the above raw materials can be bought from chemical raw materials stores. Plexiglass (methyl methacrylate) should be available from organic chemical raw material stores or plexiglass processing shops. Silica gel is also an important food desiccant.