Plastmodifiering, valet av tillsatser bör uppmärksamma dessa sex punkter
Although the formula for plastic modification appears straightforward, it has some undiscovered complexities, therefore we must be cautious when selecting plastic additions. To learn how to create a formula with improved performance, cheap cost, and simple processing, Coace will provide you the following six details today. Describe the available auxiliaries.
01 Select additives based on the intended use
Lubricant, releasing agent, stabilizer, processing aid, thixotropic agent, plasticizer, and PVC stabilizer can all be used to increase processing performance.
Plasticizers, reinforcing fillers, toughening agents, and effektmodifierare can all be used to improve mechanical qualities.
Pigments, dyes, nucleating agents, and optical brighteners can all help to improve optical characteristics.
Antioxidant, PVC stabilizer, UV absorber, fungicide, and antifungal agent improve anti-aging effectiveness.
Enhance the surface's antistatic, slipping, wear-resistant, anti-blocking, and anti-fogging qualities.
Fillers and diluents can save costs.
Enhance additional qualities, such as those that help in combustion, chemical crosslinking, coupling, and foaming.
02 The additive targets the resin with preference.
Flame retardants based on nitrogen are effective for oxygen-containing species, such as PA, PBT, and PET; red phosphorus flame retardants are effective for PA, PBT, and PET;
Glasfiber med en värmebeständig modifiering presterar bättre med kristallina polymerer än amorfa plaster;
Conductive plastic with carbon black filling performs well with crystalline resins; copolymerized polypropylene responds well to the nucleating agent.
03 Comparability of resin and additives
In order to ensure that the additive and the resin are dispersed according to the anticipated structure, to complete the design index, to ensure that the effect will be exerted for a long time within the service life, and to ensure that it is resistant to extraction, migration, and precipitation, the compatibility between the additive and the resin is better.
With the exception of a few additions, like surfactants, high compatibility with the resin is essential to maximize the addition's effectiveness. As a result, it is essential to make an effort to increase or improve its compatibility, such as by using a coupling agent or compatibilizer for surface activation treatment.
04 Additive shape selection
It is good that fibrous additions have a strengthening impact. We add glass fiber through the vent hole because the aspect ratio, which describes how fiberized an additive is, is a good indicator of how effective reinforcing will be.
than retain the aspect ratio and lower the likelihood of fiber breakage, the molten state is preferable than the powder state.
The spherical additive has a high brightness and an excellent toughening effect. Since barium sulfate is a characteristic spherical additive, it is utilized to fill high-gloss PP and may also be used to give tiny objects more stiffness and toughness.
05 Additive particle size selection
Effect of additive particle size on mechanical properties: The tensile strength and impact strength of the filler material increase with decreasing particle size.
The effectiveness of a flame retardant is affected by additive particle size; the stronger the flame retardant effect, the smaller the flame retardant particle size. For instance, less hydrated metal oxide and antimony trioxide must be used to have the same flame retardant effect as smaller particle sizes.
Effect of additive particle size on color matching: The tinting intensity, concealing power, and color uniformity all increase with decreasing colorant particle size. The colorant's particle size does not, however, go as small as it might; there is a limit, and the limit varies depending on the property.When it comes to tinting strength, azo colorants have a limit particle size of 0.1 m, whereas phthalocyanine colorants have a limit particle size of 0.05 m. The colorant's maximum particle size for concealing power is around 0.05 m.Electrical conductivity is impacted by the particle size of additives: Consider carbon black as an example. The easier it is to construct a network conductive channel, the less carbon black has to be added to have the same conductive effect. However, just like a colorant, a particle size has a limit value. If a particle size is too tiny, it is simple to collect and challenging to disperse, which has a negative effect.
06 The quantity of added additions
The right addition of additives is not only based on the economic principle of cheap cost, but also improves the target resin to the acceptable performance. Different additives have different specifications:
(1) Although greater additives to flame retardants, tougheners, magnetic powders, barrier agents, etc. are better from a performance standpoint, the cost must also be considered;
(3) Antistatic agent, only produce a charge leaking layer on the surface; (4) As a coupling agent, it is sufficient to build a surface coating. (2) Conductive additives, often establishing a circuit channel.