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Product details
Some toy products need to be sprayed with oil on TPE/TPR materials. In fact, there are special precautions when spraying oil. Generally, the main component of paint is resin. Its function is to make the pigment adhere to the surface of rubber parts. Generally TPE paints are mainly aromatic hydrocarbons and ketones.
Main precautions for TPE/TPR injection
1 solvent reason
For common hard body materials such as ABS and HIPS, paint is usually mixed with a solvent with weak chemical properties. So as to ensure that the surface of the glue piece can be kept smooth after oil injection without damaging the physical strength.
On the other hand, general soft-bodied general plastics, such as PVC, are usually accompanied by solvents with strong chemical properties. Because the soft rubber parts will have a certain degree of deformation and extensibility, strong solvent can ensure that the paint material will firmly adhere to the rubber parts, even if the soft rubber material is deformed, it is not easy to separate.
TPE integrates the characteristics of soft glue and hard glue. If there is a problem during oil injection, it is often due to an error in solvent selection, resulting in burning and deoiling.
(1) glue burning-mainly occurs on rubber parts with TPE hardness greater than 70 degrees. due to the strong solvent used, the surface is seriously corroded and traces are left when contacting the rubber parts, i.e. glue burning occurs.
② De-oiling-mainly occurs on rubber parts with TPE hardness less than 70 degrees. Because the solvent used is too weak, the paint cannot be firmly attached to the surface of the adhesive. Once the soft rubber piece is deformed, the paint itself cannot follow the shape change, causing the surface layer to separate, causing deoiling.
2 module design
If the surface of the product is uneven, such as the doll's face, burning glue will often occur. The reason is that solvent usually accumulates in the uneven part, and the chance of burning glue naturally increases.
3 nozzle material (copy) composition is too much
Manufacturers usually add different proportions of nozzle materials in their production. However, the nozzle material will reduce the chemical resistance of the glue piece. When the solvent that the pure raw material product can bear is too strong for the product containing the nozzle material, the glue burning occurs.
4 tPE containing PP or pe components
Some TPE contains PP or PE components to enhance adhesion. However, PP and PE are chemicals with strong chemical resistance, so the finished TPE products have poor oil injection performance.
Solution
(1) choose the appropriate bath agent. In general, the first cornerstone does not recommend manufacturers to prepare their own paints, but should seek help from professional paint suppliers.
(2) Try to design the material level as flat as possible. If the design is limited, paint should be diluted as much as possible to reduce the influence of glue burning due to solvent accumulation.
(3) the amount of nozzle material is arranged below 30%.
④ TPE containing PP and PE should be avoided if there is oil injection process.
As for the solvent, it is mainly used to dilute the resin and erode the surface of the glue piece so that the glue piece has more surface area for bonding. As far as TPE paint is concerned, aromatic hydrocarbons and ketones are the main components. As for toner and additives, they provide color for the paint itself and reduce foaming.
