Più di 80% delle parti decorative esterne della motocicletta (Scooter) sono prodotti in plastica ABS, quindi la qualità del rivestimento influisce direttamente sulla competitività del mercato delle motociclette. Questo documento introduce la tecnologia di pretrattamento e rivestimento dei prodotti in plastica ABS, and analyzes and discusses some special requirements for the pretreatment and coating of ABS plastics due to the particularity of ABS plastic materials.
Surface properties
addominali (acrilonitrile, butadiene and styrene terpolymer) is a thermoplastic resin plastic, which has high mechanical strength and good processing performance, but its hardness is low, weather resistance and solvent resistance is poor, which can be improved by secondary processing of plastic surface. Coating is one of the important methods of secondary processing of plastic surface. ABS plastics often have problems such as bad adhesion effect, loss of light and pitting point. The main reasons are: surface tension (less than 100mn/cm), solubility parameters are different from solubility parameters of resin and solvent in coating, and the internal stress produced during forming is easy to produce crack of paint film or reduce coating luster, and electrostatic and dust are easily generated on the surface, which affects coating effect Fruit.
Surface preparation
The oil pollution on the plastic surface will greatly reduce the adhesion of the coating, which contains the film remover (stearate, wax, alcool polivinilico, eccetera.), auxiliary (plasticizer, antistatic agent, lubrificante, anti-aging agent, anti-combustion agent), and other (lubricating oil, dust), eccetera.
processing method
(1) Manual friction test is a kind of treatment method with high labor intensity, and it is usually used in low yield. There are many disadvantages in manual friction test. Due to artificial reasons, the quality is unstable. The dirty cloth will cause the plastic surface to be polluted again, and the solvent is harmful to the operator and pollutes the environment.
(2) The method can effectively remove the weak interface layer such as oil pollution, film remover and antistatic agent, and make the surface coarsening porous, thus improving the adhesion of the coating. But high temperature operation is not conducive to safety production.
(3) The water solution treatment method is especially suitable for the situation of large production and high production efficiency. This method has the advantages of stable quality, light environmental harm, low cost and easy operation, and is gradually replacing the two methods.
technological process
Pre degreasing → degreasing → primary water washing → secondary water washing → deionization water washing → activation → blowing drying → water drying (70-75 ℃, 15min)
The pretreatment of ABS plastic products can be produced in line. All processes are spray treated and transported by hanging chain. The equipment adopts the structure of sealed dust chamber.
Degreasing
In genere, the water degreaser containing surfactant is used for spray cleaning, the time is 2-3min, the injection pressure is 20-30psi, and the temperature is 45-55 ℃. Degreasing formula contains phosphate, silicate, surfactant, inorganic minerals, eccetera. When degreasing agent is used repeatedly, impurities and dirt in the tank liquid accumulate, which will cause the re attachment of the plastic surface dirt, which will affect the coating quality. Perciò, the management of filtration and renewal of the tank liquid should be strengthened. The degreasing effect of water degreaser is good and the quality is stable, but the wastewater discharged by the agent contains phosphorus. Allo stesso tempo, it is an etching product. Glass fiber reinforced plastic must be lined in the tank and equipment of low carbon steel to prolong the service life of the equipment. In view of the above two points, it is suggested to adopt stainless steel structure equipment and tank body to increase the service life of the equipment. Before discharge, the wastewater can be discharged after it is treated to the standard.
activation
Activation is a process of water meter adjustment containing water macromolecules. It can be sprayed at room temperature for 1min and injection pressure of 7-14psi.
L'attivazione può aiutare a rimuovere l'acqua dura, convertire la superficie plastica idrofoba nella superficie contenente base idrofila, e formare una pellicola uniforme sulla superficie plastica, con uno spessore non superiore a 5 nm, ma migliora la bagnabilità e l'adesione del rivestimento alla superficie plastica. Dopo l'attivazione, deve essere asciugato con aria compressa pulita e asciugato a 70-75 ℃ per 15 minuti.
Informazioni su JasonMould Industrial Company Limited
Jasonmould è un Produttore di stampi in Cina di stampi in plastica- stampo da iniezione, stampi per pressofusione, soffiaggio plastica, stampaggio rotazionale, medico stampaggio ad iniezione plastica, due colpi stampaggio ad iniezione plastica, stampaggio a inserto, sovrastampaggio, stampaggio ad iniezione di metalli, micro stampaggio ad iniezione, stampaggio a iniezione di polvere, stampaggio ad iniezione di ceramica, stampaggio ad iniezione di liquidi, stampaggio a iniezione husky, muffa domestica, stampo per colata, strumento di stampo, stampi personalizzati, stampi per porcellana, strumenti di prototipazione rapida, strumenti di prototipazione in plastica, utensileria per punzonatrice, muoiono e utensili per parti di telefoni cellulari/cellulari, parti automobilistiche, aspirapolvere, strumenti ricaricabili, telefoni, fotocopiatrici, computer, altoparlanti multimediali, e molti altri prodotti elettronici ed elettrodomestici. E anche un produttore di prodotti in plastica, produttore di stampi Cina- parti in plastica, serbatoio dell'acqua in plastica, palline di plastica, contenitori di plastica, fibbia di plastica, ancora di plastica, gancio di plastica, cucchiaio di plastica, raccordo per tubi in plastica, caduta di plastica, stoviglie di plastica, bicchieri di plastica, bottiglie di plastica, vassoio di plastica, contenitore cosmetico in plastica, contenitore di plastica, contenitore per alimenti in plastica, sedie di plastica, tappi di plastica, chiusura con tappo in plastica, tubi di plastica, tubi dell'acqua in plastica, manopole di plastica, tubi di plastica, scatole di plastica, rastrelliere di plastica e così via.
Contatto:
Persona: James Yuan
Azienda: JasonMuld Industrial Company Limited
Aggiungere: Villaggio LongGang,Città di LongXi,Contea di BoLuo,HuiZhou Cityhou,Provincia di Guangdong, Cina
telefono: 86-752-6682869
E-mail: [email protected]
Luogo: https://www.jasonmolding.com/custom-injection-molding/
