All plastics, which are more often called plastics, are produced on the basis of synthetic or natural polymers, although synthetics are used much more often for these purposes. Plastics have a very useful property - they can go from a viscous-flowing state to the original solid state, but here a completely reasonable question arises: how to dissolve the plastic so that it becomes viscous-flowing? Such means exist, and often the method of dissolving such materials is much more effective than the most popular adhesive compositions, since the connection of parts is uniform, without any third-party layer.
What is Solvent 646?
Solvent 646 is a multi-component solvent that is a mixture of the following organic solvents: alcohols, aromatic hydrocarbons, ethers and ketones.
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What can you do at home?
This is a generally accepted name for materials, the main (and sometimes exclusive) component of which are macromolecular natural or synthetic substances Source replast-ltd.com
Perhaps someone believes that all plastics are the same in structure, but this is a misconception, sometimes leading to damage to parts that are going to be glued together. To figure out what can be used to dissolve plastic, it’s a good idea to determine its type - manufacturers often mark products with a triangle with a number from 1 to 7 in the center. In addition, there may also be an abbreviation that will help determine the type of plastic.
Addendum: Other Post-Processing Techniques
It should also be noted that PLA is easily sanded with regular sandpaper. In some cases, it is quite enough to get the surface as it should be, especially if you only need to remove traces of support or similar defects. Stripping is also very useful before chemical treatment. Just sand over problem areas and especially large artifacts, and then proceed as described above. This will save both time and reagent, and the finishing will be more accurate, without significant geometric distortions.
Anti-corrosion agent
Liquid plastic is also characterized by a high degree of adhesion to the metal surface being processed. This property of the substance began to be used in anti-corrosion treatment of steel. Liquid plastic is applied to the surface without prior priming. It dries out in a few hours. After this, a film is formed on the surface that will protect the material from rust.
a material that is highly resistant to many chemicals and fire.
PVC has relatively low frost resistance (-15 degrees).
The heat resistance index is +65 degrees.
Let us note several main advantages of the material:
1. does not dissolve in water
2. Resistant to acids, alcohols, alkaline solutions and mineral oils
3. Compatible with some plasticizers.
4. has low flammability and high resistance to oxidation
5. Easily dissolves in the following substances:
esters, ketones, hydrocarbons (both chlorinated and aromatic)
We are especially interested in the fifth point: the solubility of PVC, namely what substances can be used to do this.
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Below are the best products for dissolving PVC.
Solvent for PVC
Based on the above, we conclude that ketones, ethers and hydrocarbons are ideal for dissolution.
This means that it is necessary to use products that contain one of the presented components.
There are more than enough such funds. There is no end in sight to the variety of prices and varieties. We have chosen two that meet the price-quality ratio.
TetraHydroFuran (THF) is a chemical colorless liquid substance with a characteristic ethereal odor. It has found its application in organic synthesis.
Excellent for dissolving polyvinyl chloride to a paste-like state. Can be purchased at any specialty store.
Cyclohexanone is a clear oily liquid with a distinct odor of mint and acetone.
The substance in question is a typical representative of ketones, which, based on what was written earlier, is well suited for dissolving PVC.
What you need
The first step is to prepare a small container. It can be metal or glass; both materials will withstand the experiment. You can buy a liquid called “Dimexide” at your nearest pharmacy; it is inexpensive, about 70 rubles per 100 ml. This volume should be enough. It is better to melt plastic from unnecessary parts.
To do this, cut it into small pieces. A broken children's toy will do just fine. Additionally, prepare a small stick, preferably metal or wood. It is useful for mixing liquid plastic. And, of course, any form for pouring molten plastic. It can be anything, the main condition is that the form should not be plastic.
What can be made from melted plastic?
At home, you can make various crafts from molten plastic, from jewelry, basic knife handles, screwdrivers, mounting bolts, various cases, boxes, to more complex products. The main thing is to have the right shape, which can be made from metal, wood and graphite.
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Cooking process
When all the necessary ingredients are prepared, you can begin the process itself:
- Place pieces of plastic in a metal or glass container. The finer they are cut, the faster the melting will occur.
- Fill the plastic with Dimexide. The bottle is enough for 300 grams of plastic, that's approximately. Next you need to look at the consistency of the resulting liquid plastic. Through trial and error, you can determine the required proportions for plastic pieces of different strengths.
- After 3-5 minutes, the plastic will begin to gradually dissolve, at which time you can start stirring it periodically.
- In 2 hours our liquid plastic will be ready.
Next, you can pour the resulting composition into the prepared form. I took a hex head into which I placed a screw of the appropriate diameter, but so that it was there freely. Homemade liquid plastic will take about 24 hours to dry. The deeper the mold, the longer it will take to dry. Then you can remove the part from the mold.
When my part was completely dry, I was able to evaluate the quality of the work done. I can say with confidence that the plastic turned out to be of good quality, dense, without pores. In this way, plastic parts of any size and shape can be produced.
Video description
How to dissolve plastic. Polycarbonate and 5 solvents.
Types of glue for plastics
Read in the user manual, which must be included with the tube, which plastics can be glued with it. Source ortait.ru
We have already said that plastics are different and a certain brand of glue may be suitable for each of them, and the joining methods may differ. from friend. The most popular and reliable method is softening the surfaces of the parts to be joined with one or another solvent, for example, for plexiglass (PMMA) and polystyrene (PS) one-component dichloroethane Cl2HC-CH3 or two-component ClH2C-CH2Cl is suitable.
Liquid adhesives
The material has good moisture resistance and does not fade, so it is often used to seal seams between a window sill and a double-glazed window or between a slope and a window profile Source Stroyremontiru
The most popular are liquid compositions diluted either with a solvent or water. In the first case, when the glue is spread on the surface, the plastic softens (the top layer dissolves) and the adhesive base penetrates into the plastic, that is, high-quality adhesion occurs. When the solvent evaporates (evaporates), the parts are tightly connected to each other, like a monolith. In the case of water, plastic parts are held in place only thanks to the adhesive base, that is, a monolith is not obtained and the adhesion is quite weak.
It all depends on what exactly you are going to connect. If the plastic has a porous surface, then water-based compounds can be used. For example, PVA is used for linoleum, using a construction hair dryer when gluing. But in cases where the load is “pull-off”, this type of glue is simply useless - substances that dissolve plastic are needed here.
Contact adhesives
88 glues various materials from metal, rubber, leather, fabric, plastic, glass, cork, felt, wood and other non-porous materials, except polystyrene and polyolefins Source promobud.ua
This type of glue works as follows: both surfaces are smeared (joints of parts) , and is kept for a certain time specified by the manufacturer on the tube. After this, the fragments are pressed tightly against each other and held under pressure for some time (indicated on the container). The best brands are BF-2(4), B-7000, 88 CR2402. All contact compounds are divided into: those requiring a hardener and adhesives that do not require the addition of a hardener. When using such compounds, it is recommended to ventilate the room, as they are toxic.
Note: B-7000 glue has proven itself very well; it is a Chinese new product that is better than any European composition.
Thermal method with glue and foil
If you need to make a circuit board or metallize another flat surface in , you can bond the plastic to the foil by heating it.
A regular oven will do the trick. To do this you will need: - a piece of plastic; - copper foil; — glue BF-2 or BF-4; - solvent; - clamps; - copper or wooden plates; - oven or iron. Take a sheet of plastic and wipe it with solvent. Also degrease the foil on the side that you will glue. Lubricate the surfaces of plastic and foil with BF-2 or BF-4 glue and leave for as long as indicated in the instructions. Place a sheet of foil over the plastic. Press down so that there are no air bubbles between the surfaces. Clamp the workpiece between pieces of wood or metal using clamps.
Place the structure in an oven preheated to approximately 100°C and leave for about 20 minutes. Turn off the oven, remove the dough and leave it to cool overnight. After that you can pay. If you don’t have an oven, you can use an iron by pressing the workpiece against it from the foil side using clamps.
You can also use soap solution or shampoo to degrease.
